US1462878A - Jack - Google Patents

Description

July 24., 1923. 1,462,878

G. W. WILLIAMSON JACK Filed March 30 1922 2 Sheets-Sheet 1 July 24, 1923. 1.462.878

- G. W. WILLIAMSQN JACK Filed March so 1922 2 Sheets-Sheet 2 WZWM Patented July 24, 1923.

htthi GEORGE WARREN WILLIAMSON, OF INDIANAPOLIS, INDIANA.

JACK.

Application filed March 30, 1922. Serial No. 547,979.

To all whom it may concern:

Be it known that I, GEORGE VZARREN Win LIAMSON, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented a new and useful Jack, of which the following is a specification.

The object of my invention is to produce an efiieient lifting jack, the load-engaging member ofwhich may be either raised or lowered by proper manipulation of the operating lever without preliminary adjustment of any other member.

The accompanying drawings illustrate my invention: Fig. l is an elevation of one side of a jack embodying my invention; Fig. 2, an elevation of the other side; Fig. 3, a fragmentary section of the base show.- ing an adjacent portion of the main stem; Fig. 4, an elevation of the removable section of the operating lever; Fig. 5, a perspective of one of the clutch members; Fig. 6, a section on line 6-6 of Fig. 9, of the load-carrying unit; Fig. 7, a sectionon line 77 ofFig. 6 with the parts inposition for lifting action; Fig. 8, a section, on me plane of Fig. 7, with the parts in position for lowering action; Fig. 9, a section on line 99 of Fig. 6; Fig. 10, a section on line 10-10 of Fig. 7; and Fig. 11, a section on the plane of Fig. 10 with the parts shifted as in a lowering action. r

In the drawings, 20 indicates a main stem, preferably of channel cross section, provided at its upper end with a head 21 having a lateral projection to which is pivoted a depending finger 22 so as to form a hook having a recess 23 so that the structure may be hung upon a support.

Finger 22 is separably pivoted on head 21 by a bolt 24 and swing in one direction is limited bya stud 25 cooperating with a stop-shoulder 26. Finger 22 is provided with a gripping cam 27 cooperating with a gripping surface 28 so that a wire or similarobject may be gripped.

Stem 20 is supported by a base 29, either in the position shown in Figs. 1 and 2, or in Fig. 3 and is retained by the movable bolt 30. Base 29 is provided with a primary socket 31, in which stem 20 may be supported vertically, and with lateral openings 32 and 32 which permit support of stem 20 in either. direction horizontally as indicated in Fig. 3.

Longitudinally slidable on stem 20 are two clutch members or climbing member 35, capable also of a slight lateral movement, at right angles to the wearing-faces 20 of stem 20. Each member 35 carries a gripper block 36 seated somewhat loosely in a pocket 37 which preferably has a convex bottom, as shown at 38, and the gripper block is so formed that, when in engagement with face 20, downward movement of member 35 on stem 20 is prevented.

Also slidably mounted on stem 20 is a load-engaging member 40 having rollers 41, 41,'engaging stem 20, and a load-receiving step 42. p

Member 40 is provided, opposite the channel of stem 20, with two vertically- spaced eyes 43 and 44 into which are projected the upper and lower fingers 45 and 46 ofend of a pin 55, upon the'stem 20,the ar rangement being such that spring 53'yieldingly holds the clutch blocks 36 against face 20' of stem 20. z

Each carrier 35 is provided with a pro jection'57 which lies adjacent a segmental surface 58 on lever 49 and carrier 47 is per mitted to rock on stem 2 0,v as indicated h" Fig. 8, for a purpose which will appear.

Member 40 is perforated at 60 and provided with an adjacent gripping surface.

61 with which a gripping-cam 62 may cooperate.

In order that the device. may be used as i a vise, for gripping pipe and other article's, the stem 20 may be supported as shown in Fig. 3, and I provide a swinging aw .70

finger 22.

Lever 49 is provided with a pocket 7i for the reception of the extension shown in Fig. 4, said extensionhaving various nutsoclr'ets 72 so that it maybe used as a wrench; I

In operation, oscillation of lever 49 will cause members 35 to climb stem 20 and thus which i maybe substituted for raise member 40. If, however, the lever 49 be laterally swung, alternately, in opbe alternately shifted, against the action of Spring 53, so as to withdraw the clutch blocks 36 alternately from face 20, and, as these clutch blocks only serve to resist downward movement on the stem 20, when they are in actual engagement with face 20, it is apparent that the alternate lateral re ciprocation oflever 49' will permit the climbers 35 to be shifted downwardly on stem 20 during the period when they arelaterally displaced, as indicated in Figs. 8 and 11. y

The device is useful not only as a lifting jack but also as a wire stretcher and in many other Ways which, will naturally suggest themselves, and in the claims the term lift ing jack i-s'merely used as typical rather than limiting. r

In order to obtain a continuous sliding return of the load-engaging member along stem 20, the lever 49 may be swung to a position substantially parallel with the stem. The carrier 457 may then be tilted, finger i6 "fulcruming upon an adjacent portion'of the member 40, so that both of the clutch-carryingrmembers 35, 35wil1 besimultaneously shifted laterally to the position illustrated in the right hand side of Fig. 8; whereupon, the entire load-engaging member may be shifted longitudinally on stem 20 in either direction.

The tilting mentioned above is obtained by means of a cam surface 80 on lever 4-9, said cam surface 80 coming into engagement with the upper surface of eye a l when the lever 49 is swung up parallel with stem 20.

Swing of lever 49 is limited in downward direction by engagement with eye at, as shown in Fig. 1 and, in order to prevent cam 80 from coming into accidental engagement with eye 44,-, normal swing of lever 49 in the upper direction is prevented by a projection 81 which, conveniently, is the pivot pin of the upper roller 41 and of sufficient length to be pushed lengthwise so as to occupy either a lever obstructing position or one out ofthe line of movement of the lever.

I claim as my invention:

1. A lifting jack comprising a main stem, a load-engaging memberv slidably mounted on the stem, a pair of climbing members mounted on the stem and movable longitudinally and laterally, a pivoted operating levercarried by the load-engaging member, interengaging means between said lever and climbing members for causing relative reciprocation of the climbing members upon oscillation of the lever, means for'normally causing the climbing members to actively interengage with the stem in one direction of movement while permitting freedom of movement in the opposite direction, and means permitting lateral movement of the lever to cause lateral shifting of the climbers to permit reverse movement of the climbers on the stem.

2. A lifting jack comprising a main stem, a. load-receiving member slidably mounted on the stem, a pair ofclutch members slidably mounted on the stem and having a clutch interengagement with the stem active in one direction only, a shiftable carrier carried by the load-engaging member, an operating lever'pivoted on said carrier, means carried by said operating lever for engaging the clutch members to reciprocate the same upon oscillation of the lever, a spring nested,

in said carrier for normallyholding the clutch members in active relationship with the stem, the lever bemg so formed that,

by tilting its carrier it will engage the clutch member to shift it to inactive position pending and during oscillation of the lever, for the purpose set forth.

3 A lifting jack comprising a main stem, a load-receiving member slidablylmounted on the stem, a pair of clutch members slidably mounted on the stem and having a clutch interengagement with the stem active in one direction only, a shiftable carrier carried by the load-engaging member, an operating lever pivoted on said carrier, means carried by said operating lever'fo'r engaging the clutch members'to reciprocate the same upon oscillation of the lever, a spring for normally holding the clutch members in active relationship with the stem, the lever being so formed that, by tilting its carrier it will engage'the clutch members to shift them to inactive positions pending and during oscillation of the lever, for the purpose set forth.

4. A lifting acli comprising a main stem,

a load-receiving member slidably mounted on the stem, a pair of clutch members slidably mounted on the stem and having a clutch interengagement with the stem active in one direction only, a shiftable carrier carried by the load-engaging member, an operating lever pivoted on said carrier, means carried by said operating lever for engaging the clutch members toreciprocate the same upon oscillation of the lever, the lever being so formed that, by tilting its carrier on said stem, a pair of climbing members.

slidably mounted on the stem and provided with clutch portions active upon the stem in one direction, rack-teeth carried by said climbing members, a lever carrier rockably mounted in the load-engaging member, an

operating lever pivoted on said rocking,

carrier and provided with a pinion engaging the racks of the climbers, and also provided with a portion adapted to engage and laterally displace the climbers upon lateral displacement of the lever and during oscilla' tion thereof, a plate connecting said climbers, a spring nested in the rocking carrier engaging said plate to normally urge the clutch members to active position.

6. A lifting jack comprising a main stem, a load-engaging member slidably mounted on said stem, a pair of climbing members slidably mounted on the stem and provided with clutch portions active upon the stem in one direction, rack-teeth carried by said climbing members, a lever carrier rockably mounted in the load-engaging member, an operating lever pivoted on said rocking carrier and provided with a pinion engaging the racks of the climbers, and also provided with a portion adapted to engage and laterally displace the climbers upon lateral displacement of the lever and during oscillation thereof, a plate connecting said climbers, a spring engaging said plate to normally urge the clutch members to active position..

7. A lifting jack comprising a main stem, a load-engaging member'slidably mounted on said stem, a pair of climbing members slidably mounted on the stem and provided with clutch portions active upon the stem in one direction, rack-teeth carried by said climbing members, a lever carrier roclrably mounted in the load-engaging member, an operating lever pivoted on said rocking carrier and provided with a pinion engaging the racks of the climbers, and also provided with a portionadapted to engage and laterally displace the climbers upon lateral displacement of the lever and during oscillation thereof.

In witness whereof, I have hereunto set my hand at Indianapolis, Indiana, this 28th day of March, A. D. one thousand nine hundred and twenty-two.

GEORGE WARREN l/VILLIAMSON.

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