Title:
Ceiling board jack
United States Patent 2499005


Abstract:
1I The invention aims to provide an effective, durable and safe jack enabling one man to lift sheets of ceiling board and hold .them in place while they are being nailed, and in carrying out this end, a further object .is to provide .a jack which is notmonly extensible and-retractable-due to...



Inventors:
Ira, Sellers
Application Number:
US77106047A
Publication Date:
02/28/1950
Filing Date:
08/28/1947
Assignee:
Ira, Sellers
Primary Class:
Other Classes:
108/147, 254/97
International Classes:
B66F13/00; E04F21/18
View Patent Images:
US Patent References:
2337796Ceiling and wall jack1943-12-28
1606101Plaster-board support1926-11-09
1453473X-ray plate changer1923-05-01
1417948Adjustable washstand1922-05-30
0944560N/A1909-12-28
0831994N/A1906-09-25
0122631N/A1872-01-09



Description:

1I The invention aims to provide an effective, durable and safe jack enabling one man to lift sheets of ceiling board and hold .them in place while they are being nailed, and in carrying out this end, a further object .is to provide .a jack which is notmonly extensible and-retractable-due to the provision of telescoped standard sections, but due to:the provision,of vertically adjustable legs for a base which supports the standard.

Figure 1. of the accompanying ,drawings ,is a side elevation of the jack.

Fig. 2 is an end elevation.

Fig. 3. is, an. enlarged vertical longitudinal section on line 3-3 of Fig. 2.

:Figs. 4 and 5 are horizontal sectional views on the correspondingly numbered lines of Fig. 3.

Fig. 6 .is .a horizontal sectional .view.on. line 6-6 of Fig. 3.

.A preferred construction has been illustrated in .the drawings :and will be rather specifically described, but it is to be understood: that within the scope of the invention as..claimed, :nnerous .minor variations may be made.

A horizontal base 7 is providedp having, vertically adjustable, legs .8,,said legs having casters 8' allowing the entire device-:to ber readily moved into proper position:upon:.a foor: aPd: also permitting it to be rolled :fromone :room t:o--another.

A lower-.tubular standard. section ,9-is -se,curei-at its lower end to the base :L, an- upper standard section. 10 .is slidably- telescoped with: saidlower section :9, and. a horizontal .ceiling. board s~gporting frame 11 is carried by the luper end -of said upper standard section , -0; -and :provision is made for raising: and lowering the. section 10 .and f for holding it. in .adjusted position..

The base 1 includes a flat horizontal r.e.ctngmlar frame 12 having parallel side hars iS and -parallel end bars 14 integrally joined .to -each other, said frame being rectangular as.shown; in Fig. 6. The: side and :end bars 13 and, iA4 may Swell be formed from two lengths of-flatý or bqar metal bent into U-shape:.and having theirends :secured together by splice plates: 15 'riveted ror otherwise secured in place, at:the centersi.of tbhe side bars. 13.

The legs 8 which are formed of rectang.tar .bars having flat outer faces, . are::all dis50sed vertically within the corners of .the frame- 12, and angular yoke plates 16 .engage the IAnjer, sides of said legs and are secured to the frame side and end bars by bolts or the: like- 17. VWhen these bolts are loosened, the frame 12 mayi:be vertically adjusted with respect to the legs-8;, aad .said frame, and legs; may be then clampedd;:: locked against relative movement by tightening saad-bolts.

.In the .construction shown, the upper edges of the splice plates A15 are provided with in,5 ,ardly projecting horizontal flanges 18 upon which .a transverse h.rizontal.plate 19 is secured by bolts or the like 20. One of. these boltsalso secures the lower end of an inclined standard brace 21, and anothersimilar brace 22. is.secured ;10 by a bolt or the like 23 to a, racket 24 riveted or otherwise, ecured to one of the end bars 14 of the base frame 12.

The tubular lower standard, section 9 includes two longitudinal semi-cylindrical halves:25 havs5 ing flanges 26 ;at their lower -ends riveted or otherwise secured to the transverse plate 19.

The longitudinal:edges-f, the halves.25 are spaced apart to -provide the -lower standard section -9 with two diametrically opposed slots 27 and 28, ;20 -and the upper ends of:said halves 25 are riveted or;otherwise secured to a;colar 29. The upper end of the -race 2.2 is secured to this collar and ithe upper end of brace 21 may be suitably seceured :o. one :.of the -halves 25. This collar is .provided with an internal notch 29,' wider .than 'the ,slot 28 and ccommunicating with the latter, for a purpose to appear.

Two-short horizontal-bars-i30 and 31 are: riveted or otherwise.secured to :the oeter sides of the .3o halves -25 -of the lower :standard section 9, respectively, said, bars ::being disposed in parallel relation with each- other.and located equidistantly -below the -colar ;29. A: vertical plate ;32 .is suitably secured tto and projects downwardly from the bar f30, and the lower: end of this plate .is secured:at 33- to;one--f-,the:halves. 25. AI.transverse horizontal shaft ,34aextends through the bars 30 ,and 31,, at one end, of these bars, and extends also -through the plate 32. A gear .5 ,40 is -secured on the central, portion of this shaft .134, a-ratchet wheel ;36 is secured on one- end of said shaft and. located at the outer side of the bar,31, and another gear 37 is secured on the other end. of said shaft- and; located at. the. outer ,45 side of the plate 32. A driving gear ,38 meshes with the gear 37 and is -mounted at 39 upon the plate 32, said driving gear having -an, operating. crank.40 A dog, 41 is cooperable with the ratchet wheel ,50 36 and is mounted ,upxon the outer side. of the bar I, ,said. dog aving a tail: a 42 instrumental in releasing it. A dog-releasing . shaft, 43 extends through the-end ,portions ,of the bars 11 and 30 opposite the shaft..34,andis provided on one end with a lug. 44 overlying.the tail 42, the other end of said shaft 43 being formed with an operating handle 45. When this handle is turned in the proper direction, the lug 44 presses downwardly upon the tail 42, thereby releasing the dog 41 from the ratchet wheel 36.

The upper standard section 10 is tubular and cylindrical and is formed with a longitudinal slot 46 which communicates with the slot 27. The gear 35 extends through both of these slots and meshes with a vertical rack bar 47 within the standard section 10. This rack bar abuts diametrically opposite portions of this standard section, at opposite sides of the slot 46, and is secured to said section by rivets or the like shown at 48 in Fig. 3. The standard section 10 has a longitudinal rib 49 secured thereto and slidably received in the slot 28 of the lower standard section 9 to prevent rotation of section 10 with respect to said section 9. A vertically elongated metal strip 50 is secured against the outer side of the rib 49 and contacts slidably with the peripheral portions of the halves 25 of the section 9, adjacent the slot 28. This strip 50 extends through the notch 29' of the collar 29.

It is preferable to secure a suitable handgrip 51 to the plate 32, to be gripped by one hand, to steady the entire device, while operating the crank 40 with the other hand. When this crank is turned clockwise, it drives the gearing to elevate the upper standard section 10, said gearing being locked against retrograde rotation by means of the ratchet wheel 36 and dog 41, to hold the upper standard section in any upwardly extended position to which it may be raised. When this section is to be again lowered, the dog is released by turning the handle 45 of the shaft 43, the crank 40 being then turned retrogradely. The lower end of the lower standard section 9 is of course open, and the supporting plate 19 is formed with an opening 52 communicating with the interior of said standard section 9, thus permitting the upper section 10 to be lowered to a position in which it will project downwardly to some extent from said upper section 9, thereby permitting maximum lowering of the ceiling board supporting frame II, to facilitate placing Of a sheet of ceiling board upon this frame. By having the adjustable legs 8 extend both above and below the base 12 and by making the upper standard longer than the lower standard so that its lower end may extend through the opening 52, an extensive range of vertical adjustment of the frame or platform II can be obtained. Also by making the base 12 of elongated rectangular shape and the frame 11 removable, the device may be readily moved through door openings. The particular construction of the device makes it very strong and sturdy, so that it can be used as a scaffold.

From the foregoing, taken in connection with the accompanying drawings, it will be seen that novel and advantageous provision has been made for attaining the desired end, and while preferences have been illustrated, attention is again invited to the possibility of making variations within the scope of the invention as claimed.

I claim: 1. A ceiling board jack comprising a substantially flat and rectangular base, vertically adjustable legs at the corners of said base, said legs extending through and having their ends extending both above and below said base, means for securing said legs in adjusted positions, a centrally apertured supporting member carried by said base and disposed at its center, a lower tubular standard having a longitudinal slot and being secured to and rising from said supporting member, the ends of said standard being open and its lower open end being aligned with said aperture, an upper tubular standard of greater length than said lower standard slidably telescoped in the open upper end of said lower standard and having its lower end movable downwardly through said aperture, said upper standard having a longitudinal slot to register with the slot in the lower standard, a ceiling board supporting frame carried by the upper end of said upper standard, and means carried by said lower standard for vertically adjusting said upper standard and securing it in an adjusted position, the last named means comprising a toothed gear rotatably mounted on said upper standard and having a portion projecting through said registering slots, a rack bar fixed within said upper standard and in mesh with said gear, means for rotating said gear and releasable means for holding said gear against rotation in one direction.

2. A ceiling board jack comprising a substantially flat and rectangular base composed of opposed side and opposed end bars having flat vertically disposed inner faces, vertically adjustable leg bars at the corners of said base, said leg bars extending through and having their ends extending both above and below said base, said leg bars being of rectangular shape in cross section with flat faces, each of said leg bars having two of its flat surfaces in slidable contact with the flat inner faces of said base bars at a corner of the base, angular clamping yokes engaged with the said flat faces of said leg bars, bolts securing said yokes to the bars of said base to clamp said leg bars against said base bars, a centrally apertured supporting member carried by said base and disposed at its center, a lower hollow standard secured to and rising from said supporting member, the ends of said standard being open and its open lower end being aligned with said aperture, an upper standard of greater length than said lower standard slidably telescoped in the open upper end of said lower standard and having its lower end movable downwardly through said aperture, a ceiling board supporting frame carried by the upper end of said upper standard, and means carried by said lower standard for vertically adjusting said upper standard and securing it in an adjusted position.

3. A ceiling board jack comprising a base, a lower tubular standard section secured to and projecting upwardly from said base, said lower standard section being composed of two longitudinal halves having their edges spaced apart to provide opposed longitudinal slots, and a collar around and secured to the upper ends of said halves to hold them in spaced relation; one horizontal bar secured between its ends against the outer side of one of said halves, a second horizontal bar secured between its ends against the outer side of the other of said halves, said bars being located equidistantly below said collar and being disposed at opposite sides of said slots, a shaft extending through said bars at one end of the latter, one gear secured on said shaft at the outer side of one of said bars, a ratchet wheel secured on said shaft at the outer side of the other of said bars, another gear secured on said shaft between said bars and extending through one of the aforesaid opposed slots, a vertical plate secured to the outer side of said one of said bars and projecting downwardly therefrom, a driving gear mounted on said vertical plate and meshing with the aforesaid one gear, said driving gear having an operating crank, a dog mounted on said other of said bars and engaging said ratchet wheel to prevent retrograde rotation thereof until released; an upper tubular standard section telescoped within the aforesaid lower section and having ceiling board supporting means, means on said upper standard and slidably engaged with the other of said opposed slots, and a vertical rack within and connected with said upper section and engaging the teeth of the aforesaid other gear.

4. A ceiling board jack comprising a base, a lower tubular standard section secured to and projecting upwardly from said base, said lower standard section being composed of two longitudinal halves having their edges spaced apart to provide opposed longitudinal slots, and a collar around and secured to the upper ends of said halves; an upper tubular standard section telescoped with said lower section and having ceiling board supporting means, said upper section having a slot to register with one of said opposed slots and a longitudinal rib slidably received in the other of said opposed slots, a gear extending through said registering slots and mounted on said lower standard section, a rack bar within and connected with said upper standard section and engaging said gear, a ver| tical strip secured to the outer edge of said rib and extending substantially throughout the length thereof, said strip being transversely curved and contacting slidably with the outer sides of said halves of said lower standard section, said collar having an internal notch through which said strip extends and means for driving said gear to elevate and lower said upper standard section.

IRA SELLERS.

SREFERENCES CITED The following references are of record in the file of this patent: UNITED STATES PATENTS Number 122,631 831,994 944,560 1,417,948 1,453,473 1,606,101 2,337,796 Name Date Miller ----_----_ Jan. 9, Rudman -------Sept. 25, Joseph ------------Dec. 28, Seska -------- May 30, McKenna -------- May 1, Russell -------- Nov. 9, Baker et al. -- ---Dec. 28,