Title:
Lifting apparatus
United States Patent 2482211


Abstract:
My invention relates to a lifting apparatus, more particularly to a lifting apparatus for lifting goods such as bags, cases, etc., from the ground to shoulder-height, so that a man can carry the goods further on his shoulder. The general object of my invention is to provide a lifting apparatus...



Inventors:
Cornelis, Reichardt Hendricus
Application Number:
US78926347A
Publication Date:
09/20/1949
Filing Date:
12/02/1947
Assignee:
Cornelis, Reichardt Hendricus
Primary Class:
Other Classes:
187/224, 414/595
International Classes:
B66F9/02; B66F9/06
View Patent Images:
US Patent References:
1407124Elevator truck1922-02-21



Description:

My invention relates to a lifting apparatus, more particularly to a lifting apparatus for lifting goods such as bags, cases, etc., from the ground to shoulder-height, so that a man can carry the goods further on his shoulder.

The general object of my invention is to provide a lifting apparatus of the kind referred to of simple and practical construction, adapted to automatically lift the goods to the height desired, after they have been placed on the lifting i platform of the apparatus and to automatically return the platform into the lower position after the goods have been taken off.

Another object of my invention is to provide a modified construction of a lifting apparatus of the kind referred to adapted to be easily changed into an apparatus for the automatic lowering of loads.

A further object of the invention is to provide for a lifting apparatus of simple form, that can be brought to and erected on the spot of use in a steady position by means of the special foot of the apparatus per se, provided with wheels.

The invention also consists in certain other features of construction and in the combination and arrangement of the several parts to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawings in which Fig. 1 is a side elevational view of one form of lifting apparatus in accordance with the invention, Fig. 2 is a front elevational view of Fig. 1, Fig. 3 is a rear elevational view showing on an enlarged scale a portion of the lifting apparatus according to the previous figures, and Fig. 4 is a horizontal section on the line IV-IV of Fig. 3.

Figs. 5-8 schematically show an embodiment of the invention adapted for automatically lifting or lowering of loads.

Referring to the drawings I is a lifting platform rotatable about a horizontal axle 9 on a slide 2 which can run up and down between two guides 12 by means of four rollers placed on two such axles situated horizontally one above the other. The unloaded lifting platform is drawn towards the slide 2 by means of tension springs 8.

To the upper part of the slide, two hooks 21 are fastened, which hooks serve to limit turning of the lifting platform about the lower axle 9 when the platform is loaded. To the slide, a rotatable axle 20 is attached and is integral with a cam member 5. Seen from the back (Fig. 3), this cam member has on its upper end a cam part bent to the right and on its lower part one bent to the left, while a straight part is arranged between these two parts (Figs. 3 and 4).

When a load is being put on the platform or taken off, axle 20, and with it cam 5, seen from the rear, are turned respectively to the right or LO to the left, by means of a rod 3 and an arm' 4, secured respectively to the platform and to the axle 20.

Parallel to guides 12, a control-rod 7, rotating about its axis, is arranged, which rod is connected with a switch for the lifting motor and has on its lower end a fixed projection 6 and on its upper end a projection II adjustable in height so that the lifting height can be changed. As a safeguard, a fixed projection 18 is provided at the maximum height, which takes over the function of projection 17 in case this should not have been sufficiently fixed by the operator, which would otherwise result in the slide overrunning.

By means of a catch 10, slide 2 is connected to an endless chain 13, the lower part of which runs round a drive sprocket 15 and the upper part over a guide pulley 14, the latter being mounted in a chain tensioning device 16. Over an interconnecting driving gear, drive sprocket 15 is driven on by an electromotor provided with a brake. The connection of slide 2 with chain 13 with the aid of catch 10 constitutes a safeguard because if the platform, on its way down, strikes something, the slide is stopped and the chain moves freely past the catch.

Figs. 3 and 4 show the slide in its lowest position and with the platform unloaded. When a load is placed on the platform, rod 3 and arm 4 turn the cam 5 to the right, whereby the cam is pressed against projection 6, thus causing the control-rod 7 to turn clockwise. By this rotation, the motor is started and the slide with its load lifted until the upper cam' part runs against projection 17, thus causing the control-rod 7 to resume its central position. In this way, the motor is stopped, the brake becomes operative and the slide with platform is stopped. When the load is taken off the platform, the latter is drawn towards the slide under the influence of the tension springs 8 and around axle 9, thus causing the cam 5 to turn to the left. The projection 17 now causes the control-rod 7 to turn in a direction opposite to the direction of the rotary movement when the slide was in its lowest 66 position, so that the driving gear moving in the opposite direction, is started, thus causing the empty platform to go down until the bottommost cam part of cam 5 causes projection 6 to rotate and take up its central position, whereby the drive is stopped again.

The vertical part. of. the cam provides for a free slowing down movement so that a close adjusting of the driving motor is not necessary and. the inertia of the control-rod with parts connected no longer plays a part, this therefore being an improvement over an arrangement in which regulating is done by a vertical movement of the control-rod.

The above construction with its rotating control-rod also makes it easy to adapt the apparatus for lowering loads.

To this end, arm 4 is replaced by a lever 4a_ provided with two arms of equal length, while rod 3 is so mounted on the slide 4 as to be laterally ad-. justable on it and can be made to coact with either arm ofthe lever, (Figs. 5-8).

In the Figs. 5 and 6 this. modified construction is. shown for automatically lifting of loads, the, platform being in the lowest position.

The, operatin ,of the arrangement has been already described, In Fig. 5 the platform is unloaded, in Fig. 6 the platform is loaded.

In the Figs. 7 and8- this modified construction is shown for automatically lowering of loads, the. platform being in the upper position. In Fig; 7 the. platform, is unloaded, in Fig. 8 the platform is loaded.

In -the modified arrangement a crossbar 21 is mounted onthe platform, the rod or arm 3 being slidable on this bar..

The-rod 3 can now beconnected with either arm of a lever 4a; as is shown, in the Figs. 5, 6 and 7, 8 respectively. The lever 4ais fixed on the: axle 20 of the cam 5.In the Figs. 5 and 6 the cam is adapted to coact with the, lower projection 6 on the controlrod 7. This control-rod has three positions (Fig. 5).

In position I the motor is stopped, in position II the motor lifts and in position III the motor lowers the-platform.

In the Figs,. 7 and 8 the modified construction is shown with the rod 3 connected to the other end of the lever 4a, the platform being in its upper position and the cam 5 adapted to coact with the upper projection !J7 f the-control-rod 7.

In Fig, 7 the platform is unloaded and the control-rod 7 is in the central position I. When the platform is now loaded the cam 5 turns the con-trol-rod into position In by means of the projection 17 (Fig, 8) and the platform is lowered.

When the platform has arrived in the lower position, the cam 5 will turn the control-rod in the central position .again. The platform will now remain in this position, until it is unloaded, 6 whereby the control-rod,is turned into position II again, after which. the -unloaded platform is lifted,. In the upper position of the platform the control-rod is turned into :position I again by cam and projection 17, and the platform will remain in this. position-until, it is loaded again.

It-will now- be clear, that by simply connecting arm 3 to either of the ends of the lever 4a it is possible to adapt the apparatus for automatically lifting or lowering of loads. 7 Transportable. lifting apparatus have often been mounted on electrocars. In the embodiment of the invention illustrated here above it is of mportance that the foot of the apparatus itself is acdapte~ toggive,-same a steady position when 7 erected and to transport the apparatus to the spot of use.

For this purpose the foot of the guide 12 comprises at one side of the guide a platform 22, bearing the electromotor and other pats of the driving mecha "ism, and p-o"idd'wilih two. wheels 23 and 24. At the other side of theguiide 12 the foot is provided with two legs 25 and 26, bearing on the floor. In the erected position the lifting apparatus is steady because of the low positioned heavy parts on the foot and the support by the two wheels 23; 2 4iand the legs 25, 26. To transport the apparatus to and from the spot of use it is suffceient to ,tilt:the guide 12 backwards so that the:legs..25;,26 come free from the floor and theapparatus is carried only by the wheels 23, 24.

By bri.ngl gýhe gIuide 12 to a horizontal position it is even possible to move same in the manner of a wheel barrow.

Therefore, apart fromthe feature of the automativ,4tart and'.top of-theload, this special foot constructiopmalke the apparatus suited for use. underc-ircumstane- -wher- electrocars provided, with a, lift would, bpetoo expensiy. or would :take too muchapla~ge;-, Though; in :tIiJllustrated embodiment an-electromoto: .has been.p shgwown,foJ . moving, theslide. it will be clear thatths.p.leqtrolemtor may be replaced -by: any opthf ki.d0of-.notpr or power unit. Therefore the- expression ,'switching" in specifi-: cationp and laiims iinclds.a."coupling or.uncouplingi," Solthe;m ~tprmay turnin one: direction. only in which case .he.-,it ching mechanism is used to couple .:the:_mQtor; onto and from the 35. edless chain l,3: :When the motoris uncoupled; thslide, c.ap moiyedow ards byits own .weight.

I claim:; 1. Lifting apparatus comprising a guide, adapted..to be:.placedj uright a slide slidable .along 4 said guide, a motor fpp' Ioving.said slide, a switch mechanism for si motor, means actuated by the load_ for ..ut oma.ticlly-wit.ching on said motor in themqovipgdirec.tin of the load, means for automatica4y switchingoff said motor, when the load has;arrive ate a,. redete. rmined height and means, actuated.,by ,the.,remRoval of the load for. autop.atigallynswit-'hing;.said motor in the back direction,, .

2. Lifting apparatus comprising., a vertical guide, a lide slidable,:aong aid guide, a motor for moving said:slide.asywitch rechanism for said motor, a platform connected to said slide, and adapted; t -.takeAs, diffi.ent position. with regard to.asaid slide as.it::ispadlod or- unloaded, a cam member movably mounted on said slide, said camn member, consisting, of.two, cam .parts being inclined;to the.right'and.Aleft respectively of the vertical and a straight cam part arranged betweenthe two said inc~ined; ,amParts, said: cammem0 ber..being ,p~c .edo,.s.aid ýpla.tform, the position of said platform determining the position of said caim .me.er, a control.-rod associated with said switch 'ech.aism said ;ontrol-rod extend.-. ing parallel to said verticaLguide and-being_ pro15 vided with -a plurality of,, projection's adapted 'to coact with. said. camnember, tas said: slide .andsaid platform moye ,to either .end of said vertical guide., - 3. Lifting app.aratus, comprising. a vertical 0 guide, a slide slidable along said guide, a motor for moving. saidJslide, a switch 'mechahnism 'for said motor, a platform .connected to said slide and adaptedto take. a different.positidn -with. regard to.said slide as.it is loaded, or unloaded, a rod 5 carried bysaidiplatform and .adjustable transversely of said platform, a rotatable axle mounted on said slide, a cam integral with said rotatable axle, a lever fixed in its middle on said rotatable axle provided with means for connecting either of the ends with said rod, a control-rod associated with said switch mechanism extending parallel to said vertical guide and beiing provided with a plurality of projections adapted to coact with said cam, as said slide and said platform move to either end of said vertical guide. HENDRICUS CORNELIS REICHARDT.

REFERENCES CITED The following references are of record in the file of this patent: UNITED STATES PATENTS Number Name Date 1,407,124 Carr -------------- Feb. 21, 1922