Title:
Elevator safety apparatus
United States Patent 2001361


Abstract:
This invention relates to elevator safe equipment. Safety brakes and related equipment arrange to stop a movable body, such as the elevat Scar or counterweight, upon such body attainir a speed which is a given amount in excess of i normal full speed, are well known. In man cases, and particularly...



Inventors:
Frederick, Hymans
Application Number:
US75401134A
Publication Date:
05/14/1935
Filing Date:
11/21/1934
Assignee:
OTIS ELEVATOR CO
Primary Class:
International Classes:
B66B5/04
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Description:

This invention relates to elevator safe equipment. Safety brakes and related equipment arrange to stop a movable body, such as the elevat Scar or counterweight, upon such body attainir a speed which is a given amount in excess of i normal full speed, are well known. In man cases, and particularly when the hoisting rope part, it is advantageous to have these safet 0) brakes become immediately effective to stop th movable body without waiting for the body t attain the overspeed necessary to have th speed-responsive device operate to apply th safety brakes.

1. One feature of the invention resides in pro viding immediate application of the safet brakes to stop the movable body when the bod: is subjected to abnormal downward accelera tion, such operation being independent of thi speed of the body.

A second feature of the invention resides ir Providing elevator safety equipment of simpl character which not only is responsive to overspeed of the movable body to cause the application of the safety brakes, but also is responsivE to abnormal downward acceleration of the body to cause immediate application of the safety brakes independently of the speed of the body.

Other features and advantages will become apparent from the following description and appended claims.

The invention involves providing a loop of rope throughout the height of the elevator hatchway and closed upon the movable body maintained in tension, the upper and lower bights of the rope, at the top and the bottom of the hatchway respectively passing around suitable sheaves, with the end of the rope in the lower bight secured to the car framework and the end of the rope in the upper bight operatively connected to the actuating device of the car safety brakes. In addition, the invention involves providing a weight connected to the end of the rope in the upper bight so that at least a portion of such weight is supported by the rope, the balance of such weight being supported by the car and serving to maintain such weight and the end of the rope in the upper bight, in fixed relation to the car during normal service conditions of operation of the car, such weight, upon abnormal downward acceleration of the car, moving downwardly at an acceleration less than that of the car so that the end of the rope in the upper bight moves upwardly ty relative to the car thereby to move the actuating device of the car safety brakes from its ,d non-safety-applying position to its position r causing application of the car safety brakes.

ig In carrying out the invention, it is preferred ts to incorporate it, as in the embodiment illusLy trated, with mechanism for causing application es of the car safety brakes in the event of over;y speed of the car. Such mechanism usually .e comprises a governor at the top of the elevator o hatchway driven at a speed proportional to that e of the car by means of a governor roping system e fastened to the car and having a loop of rope extending throughout the height of the elevator - hatchway. In incorporating the invention therey with, the governor roping system is arranged so y that the end of the governor rope extending - from the governor at the top of the hatchway e down to the car is fastened to the actuating lever of the car safety brakes. The end of the governor rope extending from the governor rope tension sheave at the bottom of the hatchway up to the car is secured to the car at some convenient point, not on the actuating lever of the car safety brakes. Part of the weight of the governor rope tension sheave is thus urging the actuating lever of the car safety brakes upwardly and thus tending to cause the application of the car safety brakes. To oppose this, a weight is suspended from the actuating lever of the car safety brakes, this weight being sufficient to overcome the upward force imparted to the actuating lever by the governor rope tension sheave, and to maintain the actuating lever in the down, non-applying position against a suitable stop, under all normal service conditions of operation of the elevator car. In the event of breakage of the hoisting cables, or of an abnormal downward acceleration of the car from any other cause, the weight suspended from the actuating lever of the car safety brakes loses its effectiveness to oppose the upward force applied thereto by the governor rope, so that the actuating lever is immediately urged upwardly.

Application of the car safety brakes therefore results instantly, independently of the speed of the elevator car. In the event the car, without abnormal acceleration, attains the overspeed for which the governor is set to trip, the resulting tripping of the governor causes the governor rope to be gripped by the governor with the result that the continued downward motion of the car effects movement of the actuating lever upwardly relative to the car, and thus, in the application of the car safety brakes;in this instance in direct response to the speed of the car.

In the drawings:Figure 1 is a schematic view of an elevator installation embodying the invention; Figure 2 is an enlarged view of the car safety brake taken as indicated by the line 2-2 of Figure 1; and Figure 3 is an enlarged view, partially in section, of the governor illustrated in Figure 1.

Referring to the drawings, elevator car 10, comprising the cab II and the car frame 12, is raised and lowered through the intermediary of hoisting cables 13 and is guided at either side by means of guide rails :4, with which cooperate guide shoes 15 mounted on the car frame. The lower transverse member 16 of the car frame is provided at either end with a car safety brake, generally designated 11, for griping the guide rails and stopping the elevator car in emergencies. The car safety brakes illustrated are a form of an "instantaneous safety" commonly known as the "roll safety". Each safety brake 17 comprises a safety block 20, suitably secured to the lower transverse member 16, having a straight-sided portion 21 adjacent one side of the guide rail 14 and a bevelled portion 22 adjacent the other side of the guide rail.

A knurled roller 23 is normally in an inactive po,30 sition at the bottom of the bevelled portion 22 of safety block 20, as illustrated in Figure 2, where a pin 24 prevents the roller from engaging the guide rail. When car safety brake 17 is applied roller 23 is raised by a lift rod 25, the lower end of which is flat, as at 26, and is provided witl a lip 27 extending under the roller. The fla portion of the lift rod is provided with a slantec slot 30 through which extends a pin 31 so tha upward motion of the lift rod leads roller 2: toward the adjacent guide rail surface. Th downward motion of the elevator car at thi instant causes roller 23 to be wedged betwee: the guide rail 14 and the bevelled portion 2 of safety block 20. This action results in th guide rail 14 being clamped between roller 2 and the straight-sided portion 21 of safet block 20, and thus, in bringing the car to a immediate stop.

The lift rods 25 for the two car safety brak( 17 extend upwardly to the upper transver. member 32 of the car frame and are arrange for joint operation by means of the bell crani 33 and 34 and the connecting rod 35. A st( 36 is provided under the actuating lever 31 bell crank 33, with which, under ordinary servi conditions, such lever is in engagement. Wh actuating lever 37 is raised from stop 36, t] lift rods 25 are raised and the car safety brak 17 applied. Also when actuating lever 37 raised a suitable switch 40 is actuated to d energize the elevator hoisting apparatus a] bring such apparatus to a stop.

For applying the car safety brakes in t event of overspeed of the car, there is provid a governor, generally designated 41, which usually positioned at the top of the hatchw and driven from the elevator car by a goverr rope 42. The governor 41 illustrated comprise: sheave 43 mounted for rotation about a shaft fixedly mounted upon a stationary standard To sheave 43, at points 46, are pivotally mouni two arms 41, each of which has a weighted e 48. The two arms 47 are connected by an equ izing link 50, and are urged to their innerm 15 position, wherein lugs 51 on the arms eng: stop surfaces formed on a hub 52 of sheave 43, by two springs 53. Each spring 53 is a helical spring positioned about a rod 54 that is secured at one end to sheave 43 and, at the other end, projects through a suitable aperture in a lip 55 formed at the weighted end 48 of arm 47, the spring 53 acting between lip 55 and a nut 56 adjustable on the rod 54. Arms 41 rotate with sheave 43 and as the speed of rotation of sheave 43 increases, the weighted ends 48 of arms 47 fly outward against the action of springs 53.

When the rotation of sheave 43 is clockwise, as viewed in Figures 1 and 3, and the speed of rotation reaches a predetermined value, one or the other of the two dogs 57, each on one end of the weighted ends 48, engages with one of the lugs 60 formed around the inside of an annular shell S6 Shell 61 is rotatably mounted upon shaft 44, and as a consequence of the engagement of a dog 57 with a lug 60, shell 61 is imparted with the clockwise rotation of sheave 43. Shell 61 is coupled, as at 62, to a yoke 63 that is pivotally secured to governor standard 45 and normally is in the position illustrated in Figures 1 and 3, against a stop 64. Yoke 63 has mounted thereon-a rope grip 65 for gripping the governor rope 42 in the sheave 43 when the yoke is rotated clockwise from its normal position. The rope grip is a wedge-shaped head of a bolt 66 mountSed in apertures on two transverse portions 67 and 68 of yoke 63 at different radii, the head being held out of engagement with governor rope 42, when yoke 63 is in its normal position, Sby a nut 70 threaded on bolt 65 and engaging 1 outer portion 68. Surrounding bolt 66 between Saortions 67 and 68 is a helical spring 71 under I an initial compression, the inner end of spring t 71 abutting against a washer 72 which, in turn, 3 abuts against a shoulder on bolt 66. As a consee quence, when shell 61 of governor 41 is rotated s clockwise as a result of the attainment of the n tripping speed of rotation of the governor, yoke 2 63 is rotated clockwise to bring rope grip 65 e into engagement with governor rope 42 and to 3 grip the governor rope between the rope grip .y and the governor sheave 43.. A drag is thus n produced upon the governor rope, and inasmuch as one end of the governor rope 42 is secured ts to the actuating lever 31 of the car safety se brakes, the drag thus produced on the governor sd rope causes actuating lever 37 to be raised relacs tively to the car as the car descends, and thus )p causes the application of the car safety brakes of 17. Undue strains and possible breakage of the ce governor rope after the drag is first produced a5 en in the governor rope, are avoided by the action ae of spring 71, which permits the governor rope to es slip past the rope grip after the governor drag is builds up to a predetermined amount.

se- To drive the governor so that its speed is in o0 ad accordance with the speed of the elevator car, and to provide instantaneous action of the car he safety brakes independently of the car speed in ed the event of abnormal downward acceleration is of the car, the portion of governor rope 42 exay tending from the governor sheave 43 down to aor the car is secured to actuating lever 37, as at s a 73 in Figure 1. The portion of governor rope 44, 42 extending from a governor rope tension 45. sheave 74 at the bottom of the hatchway up to bed the car is secured to the car framework 12 in ýnd any suitable manner, such as to outwardly exal- tending bracket 15 that is fastened to the car ost framework.

ose With this arrangement, the governor rope 42 exerts an upward pull on actuating lever which pull, when the elevator car is station; is equal to one-half the weight of the gover rope tension sheave 74 (including the wei of the tension sheave frame 76 and weights plus the weight of the unbalanced portion of governor rope 42 on the stretch from the gov nor to the governor rope tension sheave WI the car is travelling in the downward direct at a uniform speed, the upward pull on actu ing lever. 3 exerted by the governor rope 4S increased by the force necessary to drive I governor from the car, and when the car is * ceerating at a nomal rate in the downwE direction, the upward pull is still further j creased by the force necessary to overcome t inertia of the moving parts in the governor rc ing system. To overcome this upward pull the governor rope 42 on actuating lever 37, weight 80 is suspended therefrom; this weig eing of suficient amount to insure the coming of all the above specified upward forc carc operates undser all normal service conditio 25 andthus to insure the maintenance of actuat lever 37 in its down position against stop 3 ccordingly, the car safety brakes are not ai Plied during normal service conditions. In the event of excessive downward accelern 9tion of the car, such as would be incident to tn breaking of the hoisting cables 93, the weigl 80 falls dowirwardly with an acceleration le! than that of the car since the downward ac celeration of the weight 80 is retarded by t!i 45 e er apward pull exerted by the govelnor rope 4v This difference between the downward accelera tion of the elevator car i0 and the downwar accileration of weight 8results in displacemen of weight 80 upwardly relative to car 10, ane 0 thus, in upward movement of the actuating le ofS7 tocause the te s licav tion f of the car safet: The action of weight 80 under abnormal down. ward acnleration of the elevator car may b, Sexplained in anothern fashion by assuming tha the weight 80 on the car first falls with the cai eati the ubnormal downward acceleration thereof ain etih of the moving paortinthe g n or r .a-ing syste m Toover co e ti.s- up ar pula- l an* hst nuetemaneac fatai exerts an upward pull8 on actuating lever drops from it which pull, when the elevator car is staSin is equalue to a voe-half the which is nearer to zer rope tension sheave 7d4 (including the wei .of the tension sheave frame 768 and weights Plus nearer the abnweight of the unbard acceleration governor rope 42 leration the sta fretch fall. The upgonoard pull of tothe governor rope 42 utension she ac-W ýatin lever 37 remains effective, and in fact, ider conditions ofin the donward acceleration, is an amount sedlightly larger than that when actu e car is stalee exerted by the governor rope 4 increased by the force necessary To drive governor from the car, and when the car Ts * werating sptd. Upon such abnormal rate in the down-W rd aeleration of car thise upward pull ofis still further crase ythe force necessary to overcm t inertia of the moving parts in the governor rej ing system. To overcome this upwJrd pull the governor rope 42 pon the actuating lever , is no longer resisted by therefromight , with this weig r eing of sufticient amount to insure the orve coin f al the abv specmded upad fore upon tre actuating lever 37 while the elpvat a p pl a ti o o f at h n o r m a l s ar vf e bo nra k e l5 t i t o b o bs er e th e a n t e nt n ce o f a c tiao n o A-^er i17 in it down position agai11^ stop 3 the d car safety brakes are not ad Plied auning normal service conditions. Ion tditvio of excessive downward accelern tion of the car, such as would be incident towth Sl'S ^n c the hoisting cables 13, the weig no wa t is fo rt h e w i t h a n d o w n w r a t i o n l e 70 eratoat o f the car singe the downward ac t e g o ve r no r 1 of t h e pe d et e r mi n e rev er ee d f atwhich the governor operates to effect the appiaton of the car safety brakes. The car is thus topped, after the occurrence of an emer gcy condition giving rise to an abn normal a3, downward acceleration of the car, immediately cry, upon the occurrence of the condition, and in a nor shorter distance, from a lower speed and with ght less jar, than would be the case if, under such h7) conditions, the stopping of the car was made in the response to overspeed of the car.

er- It is to be further observed that governor 41 ien still remains effective as an overspeed safety ion device, operating in the event of overspeed of at- the car to grip the governor rope 42 and in this is manner to cause the application of the car ;he safety brakes.

ac- Attention is directed to the fact that the inrcd vention is particularly useful in elevator inin- stallations of comparatively slow speed and low he rise, where the amount of governor rope present ip- is such that, even assuming a free fall of the of car, the inertia of the governor roping system a is inconsequential. In such installations, the ht force causing the application of the car safety !r- brakes independently of the car speed in acýes cordance with this invention, is determined by or the effect of the weight 80 suspended on the s, actuating lever and of the weight of the govig ernor rope tension sheave 74, including the S. weight of the tension sheave frame 76 and p- weights 77.

It is to be understood that the invention is - applicable to the counterweights in a manner ie similar to that described for the elevator cars, m o It and that any suitable form of governor and saf e y rd el eration braks siai ob s safety brakes may beutilized. It is also to be c- understood that, in practice, weight 80 may be ,e surplus weight added to one or both of the lift 2. rods 25 so as to simulate the effect of weight 35 80 suspended from the end of actuating lever 37. d What is claimed is: .t 1. Elevator safety equipment for a movable d body in the hatchway of an elevator installaStion, comprising; mechanism, including a safety 40 Sbrake on said body, for stopping said body under emergency conditions, said mechanism also inScluding an actuating device on said body movable from its normal, non-safety-applying position to a position causing application of said 45 safety brake; a sheave mounted at the top of said hatchway; a loop of rope extending throughout the height of said hatchway and closed upon said body, the upper bight of said loop of rope passing over said sheave with the 50 end of the rope in the upper bight operatively connected to said actuating device, and with the end of the rope in the lower bight secured to said body; a second sheave mounted at the bottom of said hatchway and around which the 55 lower bight of said loop of rope Passes; means maintaining said rope in tension; and weighted means on said body connected to the end of said rope in the upper bight so that at least a portion of the weight of said weighted means 60 is supported by said rope, the balance of the weight of said weighted means being supported by said body and serving to maintain said weighted means and the end of said rope in the upper bight in fixed relation to said body 65 during normal service conditions of operation of said movable body, said weighted means, upon abnormal downward acceleration of said movable body, moving downwardly at an acceleration less than that of said movable body so that 70 the end of said rope in the upper bight moves upwardly relative to said body thereby to move said actuating device from its non-safety-apply_ ing position to its position causing application of said safety brake.

60 the governor rope 42 upon the actuating lever sults in raising actuating lever 37 to cause the pl ication of the car safety brakes.

5 It is to be observed the occu applicatin of the car safety brakes 7 as just described for conditions of abnormal downward acceleration of the car 10 is effected immediately and without waiting for the abnormal downward acce!70 oration of the car to bring the car, and thus the governor 41, to the predetermined overspeed at which the governor operates to effect the application of the car safety brakes. The car is thus stopped, after the occurrence of an emer2. Elevator safety equipment for a movable vice body in the hatchway of an elevator installa- atin tion, comprising; mechanism, including a safety hat brake on said body, for stopping said body un- to s der emergency conditions, said mechanism also ing including an actuating device on said body mov- hato able from its normal, non-safety-applying posi- top tion to a position causing application of said bot safety brake; a sheave mounted upon a fixed up support at the top of said hatchway; a loop me of rope extending throughout the height of said the hatchway and closed upon said body, the upper 5 bight of said loop of rope passing over said up sheave with the.end. of the rope in the upper bra bight operatively. connected to said actuating em device, and with the 'end of the rope in the am lower bight secured to said body; a weighted ten- me sion sheave suspended from the lower bight of a said loop of rope; and weighted means on said gri body connected to the end of said rope in the brs upper bight so that at least, a portion of the sai weight of said weighted means is supported by br -said rope, the balance of the weight of said re weighted means being supported by said body se and serving to maintain said weighted means ex and the end of said rope in. the upper bight in sa fixed relation to said body during normal service at conditions of operation of said movable body, th said weighted means, upon abnormal downward in acceleration of said movable body, moving down- or wardly at an acceleration less than that of said sz movable body so that the end of the rope in d the upper bight moves upwardly relative to said P body and-thus moves said actuating device from _s its non-safety-applying position to its position d causing application of said safety brake. w 3. Elevator safety equipment for a movable s body in the hatchway of an elevator installation, -comprising; mechanism, including a safety brake d on said body, for stopping said body under emer- c gency conditions, said mechanism also includ- p ing an actuating device on said body movable b from its normal, non-safety-applying position to a position causing application of said safety i. brake; a:rotatable sheave mounted upon a fixed 1 support at the top. of said hatchway; a loop of c rope extending throughout the height of said hatchway and closed upon said body, the upper bight of said loop of rope passing over said rotatable sheave with the end of the rope in the -upper bight operatively connected to said actuating device, and with the end of the rope in ,the lower bight secured to said body; a weighted tension sheave suspended from the lower bight Sof said loop of rope; and weighted means on said body suspended from said mechanism for maintaining said actuating device in its nonsafety-applying position during normal service conditions of operation of said movable body, said weighted means being ineffective to maintain said actuating device in its non-safety-applyposition upon abnormal downward acceleration of said movable body.

4. In an elevator installation; a body mov-able up and down in the elevator hatchway; safety brake equipment for stopping said body in emergencies independently of the hoisting -rope and hoisting mechanism for said body, said equipment including a safety brake on said body, a member extending along the hatchway to be gripped by the safety brake when the safety brake is applied, and an actuating device on said body causing application of the safety brake when moved-from its down position; a weight on said body suspended from .said actuating de,said weight tending to maintain said actug device in its down position; a rope in said chway, one end of said rope being secured aid actuating device, with said rope extendfrom said one end up to the top of said chway, passing over deflection means at the of said hatchway, extending down to the tom of said hatchway and thence extending to and secured to said body; and weighted ans suspended from the bight of said rope at bottom of said hatchway.

.In an elevator installation; a body movable and down in the elevator hatchway; safety ke equipment for stopping said body in ergencies independently of the hoisting rope d hoisting mechanism for said body, said equipnt including a safety brake on said body, nember extending along the hatchway to be pped by the safety brake when the safety ake is applied, and an actuating device on d body causing .application of the safety ake when moved from its down position; a pe in said hatchway, one end of said rope being cured to said actuating device, with said rope tending from said one end up to the top of id hatchway, passing over deflection means the top of said hatchway, extending down to e bottom of said hatchway and thence extendg up to and secured to said body; a weight said body operatively related to the end of id rope that is secured to said actuating evice so that said weight exerts a downward ull on such end of said rope and maintains aid actuating device in its down position uring normal operation of said body; and eighted means suspended from the bight of aid rope at the bottom of said hatchway, said eight and said weighted means cooperating uring abnormal downward acceleration of the ar to move said actuating device from its down osition to cause application of the safety rake.

6. Elevator safety equipment for stopping, mmediately upon abnormal downward accelertion and independently of speed, an elevator 15 ar equipped with car safety brakes and an actuating member for causing, when raised from a down position, the application of the car mafety~ ~ ~ brkefhrarolpeuy ' safety brakes, characterized by; a U I n the elevator hatchway extending from the top to the bottom thereof with the downwardly extending end of the rope secured to the actuating member and the upwardly extending end of the rope secured to the car; two rotatable sheaves, one at the top and one at the bottom of the hatchway, around which the rope passes the upper sheave being supported by the building S hea~ be.ing suuporte( structure ana ~he lovwe r .t.. o ....s by the rope to serve as a tensioning sheave therefor; and a weight on the car suspended 60 from the actuating member to oppose the upward pull exerted thereon by the end of the rope secured thereto and effective to maintain the actuating member in its down position during normal service conditions of car operation, 65 the weight becoming ineffective immediately upon an abnormal downward .acceleration being imparted to the car, so that the actuating member is immediately moved upward relative to the car to cause the application of the car 70 safety brakes.

7. In an elevator installation of comparatively low rise and in which the normal full speed of the elevator car is comparatively slow, safety equipment for stopping the elevator ,car 75 promptly, in a short distance and before speed of the elevator car increases to appreciable extent, in the event of abnor downward acceleration of the car, said saf equipment comprising; an instantaneous saf on the car for stopping the car by gripping guide rails for the car, said safety having actuating lever, pivotally supported on the framework, movable from a down, non-safe applying position to an up, safety-applying po tion; a rotatable sheave mounted upon a fix support at the top of the hatchway; a weight rotatable sheave at the bottom of the hatchw mounted to provide for vertical motion there( a rope in the hatchway extending from the c up to the top of the hatchway, over sa rotatable sheave, down to the bottom of t hatchway, under said weighted rotatable shea, and up to the car, the end of said rope extendi: from the car to the top of the hatchway beil secured to said actuating lever, the other end said rope being secured to the car framewor and said weighted rotatable sheave being sui ported by said rope; and a weight suspend( from said actuating lever, said weight being I such amount, not less than one-half the weig] of said weighted rotatable sheave, as to oppo the upward pull exerted by said rope upon sai actuating lever, and to maintain said actuatir lever in its down, non-safety-applying positic during normal conditions of operation of the ca said weight, upon abnormal downward accelera tion of the car, moving downward at an acce] eration less than that of said car so that sai actuating lever immediately moves from its dowi non-safety-applying position to its up, safety applying position to cause the immediate appli cation of said instantaneous safety on the cai 8. Elevator safety equipment for a movabl body in the hatchway of an elevator installa tion, comprising; mechanism, including a safet brake on said body, for stopping said body unde: emergency conditions, said mechanism also in cluding an actuating device on said body mova ble from its normal, non-safety-applying posi. tion to a position causing application of saic safety brake; a sheave mounted at the top oj said hatchway; a loop of rope extending through. out the height of sa.i ha dbh'7,- ol .^- ^i .....I - -n c , Uosed uponr id body, the upper bight of said loop of rope issing over said sheave with the end of the pe in the upper bight operatively connected to id actuating device, and with the end of the pe in the lower bight secured to said body; a cond sheave mounted at the bottom of said .tchway and around which the lower bight said loop of rope passes; means maintaining said rope in tension; governor means operatively connected to one of said sheaves and responsive 60 to rotation of such sheave incident to a predetermined overspeed of said body in the downward direction, to grip said rope; and weighted means on said body connected to the end of said rope in the upper bight so that at least a por65 tion of the weight of said weighted means is supported by said rope, the balance of the weight of said weighted means being supported by said body and serving to maintain said weighted means and the end of said rope in the upper 70 bight in fixed relation to said body during normal service conditions of operation of said movable body, the end of said rope in the upper bight, upon said predetermined overspeed of said movable body in the downward direction and '5 the consequent gripping of said rope by said ne governor means, moving upwardly relative to iny said movable body in response to the gripping nal of said rope and the continued downward moety tion of said movable body, to move said actuating ety device from its non-safety-applying position to the its position causing application of said safety an brake, said weighted means, upon abnormal Iar downward acceleration of said movable body, ty- moving downwardly at an acceleration less than si- that of said-movable body so that the end of :ed said rope in the upper bight moves upwardly ;ed relative to said body thereby to move said actu'ay ating device from its non-safety-applying posif; tion to its position causing application of said at safety brake. id o9. Elevator safety equipment for a movable he body in the hatchway of an elevator installa7e, tion, comprising; mechanism, including a safety ng brake on said body, for stopping said body under ng emergency conditions, said mechanism also inof cluding an actuating device on said body mov'k, able from its normal, non-safety-applying posiP- tion to a position causing application of said od safety brake; a governor mounted upon a fixed of support at the top of said hatchway, said gov- 25' at ernor having a rotatable sheave by which it is se driven; governor roping for driving said goverid nor in accordance with the speed of said body ng and for moving said actuating device to its n safety-applying position when, in response to a r, predetermined overspeed of the body in the d- downward direction, said governor trips, said - roping being a loop of rope extending throughd out the height of said hatchway and closed upon a, said body, the upper bight of said loop of rope 35; - Passing over said governor sheave with the end - of the rope in the upper bight operatively con. nected to said actuating device, and with the e end of the rope in the lower bight secured to said body; a weighted tension sheave suspended Y from the lower bight of said loop of rope; and r weighted means on said body suspended from - said mechanism for maintaining said actuating - device in its non-safety-applying position dur- ing normal service conditions of operation of i said movable body, said weighted means being ineffective to maintain said actuating device in its non-safety-applying position upon abnormal downward acceleration of said movable body.

10. In an elevato installation; a body movable UP and down the elevator hatchway; safety brake equipment for stopping said body in emergencies independently of the hoisting rope and hoisting mechanism for said body, said equipment including a safety brake on said body, a member extending along the hatchway to be gripped by the safety brake when the safety brake is applied, and an actuating device on said body causing application of the safety brake when moved from its down position; a weight on said body suspended from said actuating device, said weight tending to maintain said actuating device in its down position; governor means, including a governor rope in said hatchway, a governor sheave over which said governor rope passes, and mechanism responsive to rotation of the governor sheave at a predetermined speed in a given direction for gripping the governor rope, one end of said governor rope being secured to said actuating device, with said governor rope extending from said one end up to the top of said hatchway, passing over said governor sheave, extending down to the bottom of said hatchway and thence extending up to and secured to said body, so that said governor rope drives said governor sheave in d accordance with the speed and direction of mo- v tion of said body, said governor mechanism t gripping said governor rope when said body, t -E moving in the down direction, attains a given c speed in excess of its normal full speed; and s weighted means suspended from the bight of f said governor rope at the bottom of said hatch- i way.

10- 11. In an elevator installation of comparatively low rise and in, which the normal full speed of the elevator car is comparatively slow, safety equipment for stopping the elevator car promptly in the- event of excessive downward speed of the car and also for stopping the elevator car prOmptly,-in a short distance and before the speed of the elevator car increases to any appreciable extent, in the event of abnormal downward acceleration of the car, said safety equipment comprising; an instantaneous safety on the car for stopping the car by gripping the guide rails for the car, said safety having an actuating lever, pivotally supported on the car framework, movable from a down, non-safetyapplying position to an up, safety-applying position; an elevator overspeed governor at the top of the elevator hatchway; a governor rope in the hatchway; a weighted rotatable sheave at the bottom of the hatchway mounted to provide for vertical motion thereof, said governor having a governor sheave by which it is driven by said governor rope and also having means actuated at a certain speed and direction of rotation of said governor sheave to grip said 35: governor rope, and said governor rope in the hatchway extending from the car up to the top of the hatchway, over said governor sheave, own to the bottom of the hatchway, under said teighted rotatable sheave, and up to the car, he end of said governor rope extending from he car to the top of the hatchway being setured to said actuating lever, the other end of aid governor rope being secured to the car ramework, said weighted rotatable sheave beng supported by said governor rope, and said governor rope driving said governor sheave, and thus said governor, in accordance with the speed and direction of motion of the car and so that excessive downward speed of the car causes said governor to grip said governor rope, and a weight suspended from said actuating lever, said weight being of such amount, not less than one-half the weight of said weighted rotatable sheave, as to oppose the upward pull exerted by said governor rope upon said actuating lever, and to maintain said actuating lever in its down, non-safety-applying position during normal conditions of operation of the car; whereby, upo-n excessive downward speed of the car and the consequent gripping of said governor rope, said actuating lever is immediately moved from its down, non-safety-applying position to its up, safety-applying position to cause the immediate application of the instantaneous safety on the car, and whereby, upon abnormal downward acceleration of the car, said weight moves downward at an acceleration less than that of the car, so that said actuating lever is immediately moved from its down, non-safety-applying position to its up, safety-applying position to cause the immediate application of the instantaneous safety on the car. FREDERICK HYMANS.