US1404735A - Lifting jack - Google Patents

Description

L. c. BERMAN.

LIFTING JACK.

APPLICATION Fl LED 0cT.1

Patented Jan. 31, 1922.

1 nfor:

L. C. BERMAN.

I LIFTING JACK.

APPLICATION FILED OCT. 1, 1920.

1,404,735, Patented Jan. 31,1922.

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LOU-I50. IBEBMAN, OF CHICAGO, ILLINOIS.

mrrrne JACK.

Specification of Letters Patent.

Application filed October 1, 1920. Serial No. 414,096.

' easily and quickly set to raise weights at tions and different heights. 1 v

A still further object is the provision of a simple and eflicient manually operable means for preventing accidentally dropping a load when held on the jack.

Other objects will appear hereinafter.

An embodiment of my invention is shown in the accompanying drawings forming a part of this specification, and in which- Fig. l is a side elevation of a lifting jack embodying my invention;

Fig. 2 is an edge elevation of the same; i

Fig. 3 is a vertical section; Y

Figs. 4 and 5 are frag-mental vertical sec- Fig. 6 is an elevation taken as looking from line 66 in Fig. 4: of a handle and cam used in the device.

Referring more particularly to the drawings, I have indicated a bar 7, which in the present instance is a hollow tube, but may be made in any other desirablemanner. At the lower end I provide a base 8 having an opening 9 for receiving the bar 7 when the latter is to be used in upright position, and an opening 10 for receiving the bar 7 when it is to be used in horizontal position -see particularly Fig. 3. I preferably make the base so that the bar 7 can be held in the 7 base 8 with a single retaining pin 11, whether in upright or in horizontal position.

blidably mounted on the bar provide an upper member 12 and a lower: member 13 each ada ted to extend completely around the bar l j vided with a boss Mat one side with ribs 15 between the bossand its serrated lifting I The upper member 12 is pro:

also hollow and a bolt 20 passed through the hollow of the lugto hold the handle in position. Also, on the handle is a perforated lug '21 extending toward the member 12. Pivoted on the lug 21 is a connecting link 22 which has its lower end pivoted in lowermember-lSl Thedower end of link 22 may be pivoted in any desirable manner. I have indicated inwardly extending lugs 23 in member 13 which extend into grooves 24:51]. opposite sides of link 22, see

Figs. 2 and 3.

In the lower member 13 is a recessformed to snugly receive a jaw 25 which. has its teeth adapted to engage the bar 7 The opening 26 through the member 13 is preferably somewhat larger than the bar 7' in one direction so that the member 13 can rock to disengage the'teeth of jaw 25 from bar 7, see Figs. 3 and 4:. A spring 27 is placed between a suitable portion of member 13 and an arm 28 on link 22 so as to normally press the jaw 25 against the bar. Ailso, pressing downwardly on the lever/in the Patented Jan. 31, 1922.

operation of the device helps to hold the aw 25 in engagement with the bar.'

In the upper member 12 I provide a sur iace 29 disposed at an acute angle to the bar At one side of the member 12 is an open-' ing 33 with grooves 34 in the inner walls of I the sides of member 12. The grooves 34, one of which is shown inthe drawings extend'inwardly from the opening 33 and provide bearings for the journals 35 of a handle 36. The handle maybe made in any'desirable manner, but I have indicateditas-hav ing two sides 37- anda wall 38. A. cam 39 is provided between the walls 37 and spaced from the wall 38. Between the cam 39and the wall 38 is disposed an angulararineO formed on or otherwise attached to the aw holder 30. 1 7 ff I At the top of the bar? I have indicated a jaw ll secured to the bar a bolt 42andmay be secured in any desirable manner.

In the hollow top yof the bar '7 I provide a member 43 which has a slot lt therein engaging the bolt 42. This member 43 is useful to attach wire to when'it is desired to stretch the latter. Then by placing wires, and the like.

The jaw 11 may be used in connection withsliding member 12 to provide a vise and when so used it is sometimes convenient to place the bar 7 in openinglO of the base 8 sothat the jaws of members 12 and ll will be vertical.

In the operation of my device the member 12 may be raised to the bottom of a load by simply pulling-up on lever 19. Inthis upward movement the spring-pressed jaws 25 and 31 willslide up the bar'7. When the load is reached by member 12 the lever 19 is swung down and up to cause the members 12 and 13 to move up bar 7 step by step. In this step by step movement of the members 12 and 13 the swinging of lever 19 will be limited in one direction by the end boss 14 and limited in its other direction by a projection 47 on link 22 engaging A particular feature. of this'device is placing the parts in condition so that when there is a load on the surface 16, such load cannot be accidentallydropped. When it is desired to lower a load on member 12, the parts are first placed in their positions shown in Fig. 1 and the handle 36 next placed in its position shown in Fig. 5 and.

lever 19 raised to its upper terminal movement which lowers member 12. Then lever 36 is moved to its position shown in Fig.

3 and the operator presses downwardly on V a thumbpiece 49 on, the side of member 13 ashe lowers lever 19 to move member 13 down bar 7. This order of movements is continued until the load has been lowered the desired distance. 1

Sometimes it is desirable to move members 12 and 13 downwardly of bar 7 quickly, and in such cases handle 36 is moved to its position indicated inFig. a so that wall 38 extends below member 12 inthe path of extension 18 on member 13 when lever 19 is brought to its highest ,point. This moves cam 39 against arm 40 and draws jaw'31 away from bar 7 and wall 38 tilts member 13' moving jaw 25 away from bar 7 so that both members 12 and 13, together with the parts mounted thereon, are freely slid-able up and down the bar 7, as desired.

comprisinga bar; upper and lower members mounted on the bar; a jaw holder movably mountedin the upper member; a jaw in said holder; a jaw inthe lower member; a cam mounted in the up per member and having oscillatory and slidable movements; and an arm on the jaw holder engaging said cam and holding the latter in operative position. 7 2. A jack comprising a bar; upper and lower members slidably mounted on the bar, the upper member having slots therein; a jaw holder movably mounted in the upper member; a jaw in said holder; a jaw in the lower member; a cam having journals in said slots; and an arm on the jaw holder engaging the cam and holding the latter in operative position.- 7

3. A jack comprising a; bar; upper and lower members slidably mounted on the bar, the upper member having slots therein; a jaw holder movably mounted in the upper member; a jaw in said holder; a jaw in the lower member; a cam having journals in said slots; a jaw attached to andv spaced from the cam; an L-shaped arm attached to the jaw holderand extending between said jaw and cam holding the latter in position for moving the jaw holder; and a'handle 7 attached to said jaw and cam. of link 22 engaging a shoulder 46 ad acent mally holding the jaw therein against the bar; a spring-pressed jaw holdermovably mountedin the upper member; a manually operable cam-having journals disposed in said slots and a portion adapted to engage the lower slidable member and move the jaw in the'latter away from the bar; and an arm on the jaw holder. engaging the cam for holding the latter in operative position.

5. A jack. comprising a bar; 7 a hollow member slidably mounted on the bar and having an opening in one side; a jaw; holder.

movably mounted in the hollow member; a

'handle in and having a pivotal connection with the hollow member with a portion extending out through said opening; a cam attached to the handle and spaced from a portion of the latter; ajaw holder in] the hollow memberwith anarmexten'ding between the'eam and said handle holding the handle and cam inoperative positions; and a jaw in the jaw holder. I

6. A jack comprising a bar; a hollow member slidably mounted on the bar with anopening in one side and slots in its inner walls extending inwardly from said opening; ajaw holder movably mounted in the hollow member; a handle in the hollow member having'journals pivoted in said slots; a cam disposed: between portions and spaced from another portion of said handle; an angular arm on the jaw holder extending between -S&1d pO1'tl0nS of the handle-and said-cam holding the handle in said hollow member; and a ew in the jaw holder. 7

711A jack comprising a bar; upper and lower slidable members on the bar; a boss and a shoulder on the upper member; alever pivoted to said boss; and a link pivoted to the lower member and the lever, said link being adapted to engage the boss to limit the swinging of the lever in one direction and adapted to engage the shoulder to limit the swinging of the lever in the other direo tiont 8. A jack comprising it her; upper and lower members slidably mounted on the bar a boss and a shoulder on the upper member; a lever pivoted to the boss; a link pivoted to the lower member and the lever, said link being adapted to engage the shoulder to limit the swinging of the lever in one direction;- and a projection on the link adapted to engage said boss for limiting the swing ing of the lever in the other direction.

In testimony whereof I have si name to this specification on this 28th of September, A. D. 1920.

' LOUIS C. HERMAN.

gned my

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