US1526767A - Hoisting mechanism - Google Patents

Description

Feb. 17. 1925. 1,526,767

I. BENJAMINS HOISTING MECHANISM Filed Nov. 6, 1920 Patented Feb. 17, 1925.

UNITED STATES PATENT OFFICE.

l ISRAEL IBENJAMINS, OF BROOKLYN, NEW YORK.

HOISTING MECHANISM.

Application filed November 6, 1920. Serial No. 422,368.

ful. Hoisting Mechanism, of -which the following is a specification.

My invention relates to improvements in hoisting mechanisms which may be used for dental and barbers chairs, as jacks for automobiles, carriages and wagons, also for scaffolds and for sundry other purposes for which the construction of my hoisting mechanism is adapted, and it consists in the novel features hereinafter more fully described.

The objects of my improvement are:

First, to provide a collapsible hoisting mechanism with a base pivotally connected tothe lower ends of the legs thereof, without having any sliding parts at'said base.

Second, to-provide a saddle of constant length for the support of the load, said saddle being also pivotally connected to the upper ends of the bars or links composing my hoisting mechanism also Without any sliding parts at said saddle. Y Third, to distribute the load on both panels of my hoisting mechanism substan-' tially equally, thereby reducing the strains thereon.

Fourth, to have my hoisting mechanism, when employed as a jack for automobiles, operated by a key wrench extending rearwardly of the automobile into a convenient position for the operator; and

Fifth, to have my hoisting mechanism simple, durable, light and inexpensive.

I attain these objects by the mechanism illustrated in the accompanying drawings or by any mechanical equivalent or obvious modification of the same.

In the drawings Fig. 1 is a side elevation of my hoisting mechanism, with the ends of the screw 22-23 broken off Fig. 2 is a section on the line C-D of Fig. 1, with the screw omitted.

Fig. 3 is an elevation .of one of the bearing pins 29-27, looking from right to left in Fig. 1.

. Fig. 4 is a plan of the saddle 3031; Fi 5 is a section of the saddle on the line Al3 of Fig. 1. v

Fig. 6 is an elevation of one end of the screw 22-23 showin the tapered connection to the key wrenc 25;

Fig. 7 is an end view looking from right to left in Fig. 6; Fig. 8 is a cross-section of the socket end of the key wrench; Fig. 9 is an elevation of the key wrench partly brokenoil and showing the handle as broken off at both ends.

Similar numerals and letters refer to similar parts throughout the several views. 11 and 12 are a pair of inclined links or bars, pivotally connected at their lower ends to thebase 20 by means of the pins 33 and 32 respectively, and shown as crossing each other at a variable point of their length; th upper ends of said bars 11 and 12 are pivotally connected each to one end of the nuts 19 and 18 respectively by means of the pins 34 and 35 respectively.

11 and 12 are a pair of bars pivotally connected at their lower ends to the base 20 by means of the pins 32 and 33 respectively; the bar 11* is parallel to the bar 11, and the bar 12 is parallel to the bar 12; the upper endsof the bars 11 and 12 are pivotally connected to the nuts or position members 19 and '18 respectively by means of the pins 34 and 35 respectively. The distance be- ..betiween the centers of the pins 34 and 34 is the same as thedistance between the centers of the pins 33 and 32, which is also the distance between the centers of the pins 35 and 35.

It is,'theref0re, evident that the nuts 18 and 1 9 will always remain parallel to the base 20 for all an les of inclination of the bars 11 and 12, which are always equally inclined to the base 20.

13 and 14 are a pair of bars similar to the bars 11 and 12 and pivotally connected at their lower ends to the nuts 19 and 18 respectively by means of the pins 36 and 37; 13 and 14 are a pair of bars parallel to the bars 13 and 14 and pivotally connected at. their lower ends to the nuts 19 and 1% respectively by means of the pins 36 and 37.

The bars 13 and 14, also 13 and 14*, are pivotally connected at their upper ends by means of the bearing pins 29-27, which have each therein a cylindrical opening 28 adapted to receive one end 31 of the saddle 30.

The distance between the centers of the pins 29 is the same as 'the distances between the centers of the pins 37 and 37* and the centers of the pins 36 and36. i

The saddle 30 is, therefore, substantially parallel to the nuts 19 and 18 for all positions of the bars 13 and 14, which are equally inclined to said saddle 30, except that the saddle 30 has a slight depression, as shown in Fig. 1, to fit the load, which may be the axle of an automobile.

Two panels of bars 13, 14, l3 -and 14 may be used, the same as of the bars, 11, 12, 11 and 12", as shown in Fig. 2.

The journals 31 are provided in the saddle 30, as well as the bearings 28 in the pins 2927, to permit the load to adjust itself to any angle, as when'the axle of an automobile is inclined, and to strain both panels of the hoisting mechanism equally or near- 1 so.

22 and 23 is a right and left screw adapted to move the nuts 18 and 19 towards each other to raise the load or away from each other to lower the load; one or both ends of the screw 2223 may be tapered and squared as shown at 24 in Figs. 6 and 7 and adapted to fit a key wrench 25, which is provided at one end with a socket to fit the end 21 of the screw 2223, and the other end with a vise-handle 26.

The key wrench 25 may be made long enough to place the handle 26 beyond the body of an automobile and beyond all other obstructions, thereby rendering the hoisting mechanism more accessible and easy to operate.

Many other changes could be made in the details of my hoisting mechanism without departing from the main scope of my invention.

I do not therefore restrict myself to the details as shown in the drawings; but I intend to include also all mechanical equivalents and reasonably obvious modifications of the same within the scope of my invention.

What I claim as my invention, and desire to secure by Letters Patent is:

1. In a hoisting mechanism a base, a pair of inclined bars, pivotally connected thereto at their lower ends, a pair of position members, pivotally connected to the upper ends of said bars, and a means for moving said members towards or away from each other, combined with a pair of bars parallel to said inclined bars and pivotally connected at their lower ends to said base, and at their upper ends to said position members, thereby insuring the stability of the mechanism.

2. An apparatus of the character described comprising a base, a movable support, a plurality of pairs of link members pivotally secured together and to said support and said base, engageable members secured to the outer intermediate ends of said link members, engageab e members secured to the inner intermedia e ends of said link members and a revoluble member for actuating said engageable members whereby to operate said link members and raise or lower said movable support, substantially as specified.

3. In a hoisting mechanism a base, a pair of inclined bars, pivotally connected thereto at their lower ends, a pair of position members, pivotally connected to the upper ends of said bars, and a means for moving said members towards or away from each other, combined with a bar parallel to one of said inclined bars and pivotally connected at its lower end to said base and at its upper end to one of said position members, thereby insuring the stability of the mechanism.

4.1111 apparatus of the character described comprising a base, a movable support, a plurality of connecting members, each comprising four links having their ends pivotally connected together and two of said connected ends secured to said movable support and two of said connected. ends secured to said base, engageable members secured to the connected intermediate outer ends of each pair of said links, engageable members secured to the intermediate inner ends of each of said pair of links and a revoluble member traversing said engageable members, whereby to actuate the same to raise or lower said movable support, substantially as specified.

5. In a hoisting mechanism a pair of po sition members, a means for drawing said members towards or away from each other and two opposite sets of inclinded bars, piv otally connected at their lower ends to said members and at their upper ends to the opposite ends of a pair of pins, combined with bearings in said pins and a saddle for the load having at its ends journals swivelled in said bearings, thereby distributing the load on both sets of bars substantially equally and thereby reducing the strain thereon.

6. An apparatus of the character described comprising a base, a movable support, a plurality of connecting members each formed of four links having their ends pivotally connected together and forming overlapping parallelograms, said connecting members having their upper and lower ends respectively secured to said movable support and to said base, nuts pivotally se cured to the connected intermediate ends of said connecting members, and a screw traversing said nuts for actuating the same and their related parts whereby to raise or lower said movable support, substantially as specified.

7. An apparatus of the character de scribed comprising a base, a pair of outwardly projecting studs upon the opposite sides thereof, a movable support, outwardly projecting studs upon its opposite sides, a plurality of connecting members each formed of four links having their ends pivotally connected together and forming for actuating the same and their related overlapping parullelograms and secured to parts, whereby to raise or lower said movit'he studs upon the opposite sides of said able support and to hold the same locked movable support and said base, nuts pivotto any intern'lediate position, substantially 5 ally secured to the connected intermediate as specified.

ends of said connecting members, and a screw in threaded engagement withsaid nuts ISRAEL BEN J AMINS. I

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