US823949A - Lifting-jack. - Google Patents

Description

No. 823,949.- I PATENTED JUNE 19. 1906.

v W. F., 1 & L. .KIDD.

'LIFT ING JACK.

, APPLICATION FILED JAN.24. 1906.

2 SHEETS-SHEE'IYIZ.

UNITED STATES PATENT OFFICE.

KIDD, OF BLOOMFIELD,

LIFTINGHJACK.

Specification of Letters'Patent.

Application filed January 24, 1906. Serial No. 297,681.

ratented June 19, 1906.

.To all whom it may concern.-

,Be it known that we, WILLIAM F. KIDD, PETER KIDD, and Lnwrs KIDD, citizens of the United States, residing, at Bloomfield, in the county of Greene and State of Indiana, have whereby a clutch-loop is provided for gripping the standard of the jack and is arran ed to coact in a novel manner with a pecu iar construction of pawl-and-ratchet device connected to a handle pivoted to the clutch-loo and formed upon one face ofaflanged stan ard, respectively.

For a full description of the invention and the merits thereof and also to acquire a knowledge of the details of construction of the means for effecting the result reference is to be had to the following description and accompanying drawings, in which- Figure 1 is a side e evation of our improved lifting-jack. Fig. 2 is a detail perspective view of the lifting-bracket or runner. Fig. 3 is an enlarged side elevation of a portion .of the jack, the lifting-bracket or runnerv being partially broken away and in section. Fig. 4

I is a horizontal sectional view.

Corresponding and like parts are referred to in the followin description and indicated in all the views 0 the drawings by the same reference'characters. I

Referring to the drawings, the numeral 1 designates the standard of the device, which, as shown, is T-shaped in cross-section, being provided with a flange 2. The standard is preferably provided with a supporting-base 3 at one end and witha handle 4 at the other end, by which latter it may be carried from place to place. A lifting-bracket 5 is provided with preferably integral inturned flanges 6 on one side, which constitute ..to,

gether a guideway in which the main ortion of the standard 1 is fitted, so that the 'ftingbracket '5 may slide longitudinally upon the standard. The lifting-bracket 5 is provided on its'under surface with a chamber 7 and an upwardly-facing shoulder 8 therein. rear wall 7 of the chamber is inclined, as shown. A dog 9 is mounted to move up and downin the chamber 7 of the lifting-bracket or runner 5 and is provided with a downwardly-facing shoulder 9 A spring 10 en'- gages the shoulder 9 and also engages the upwardly-extending lug or shoulder 8 and bears upwardly upon the shoulder 9*, so as to tend toforce the dog 9 in an upward direction along the inclined wall 7 whereby the said upward movement will likewise tend to force the do inward against the rear face of the standar 1. Thedog 9 is recessed near its upper end, and in the recessed portion there is detachably secured a gripping-block 11, having teeth on its inner face, as indicated at. 11*. The said teeth preferably incline downwardly and are designed to'bite against the rear smooth face of the standard 1. A hand-lever 12 is pivotally mounted to the lower projecting end of the dog 9 and is The I rovided with a cam-surface 12 desi ned to 7 braces the flange 2. of the standard and has its members pivotally connected to' trunnions v 14, projecting laterally from opposite sides of the runner or bracket 5.. In the fork 13 of the actuating handle or lever 13 there .is mounted a pawl 15. The pawl 15 is pivoted between its ends and preferably below its middle, so that its upper portion, which extends slightly-rearwardly, is heavier than its lower portion. Hence the said pawl 15 will by ravity tend to assume such a position on thellandle or lever 13 that the lower end of the pawl will engage with any one of a series of c an upward direction, and the pawl 15 is preferably shaped to correspond substantially to the contour of the said teeth.

The standard 1 is provided near its upper end with a notch 17, and the runner or lifting-bracket 5 is provided on one side with a toothed roller 18, designed to coact with'a toothed and eccentrically-pivoted hand-lever 19.

In the practical operation of the device an upward movement of the handle 13 will result in carrying the pawl 15 upwardly, so as to pass one or more of the teeth 16. The downward movement of the said handle will then cause the pawl 15 to bear in one of the recesses formed by the teeth as upon a fulcrum and will also result in the raising of the forked end of the handle or lever 13 and the consequent raising of the lifting-bracket or runner 5. When the handle 13 has thus been depressed at its free end, the return movement of the handle in an upward direction will free the pawl 15 from the tooth in which it has been lodged, while incidentally the toothed gripping-block 11 will bite against the smooth rear face of the standard 1 and hold or sustain the lifting-bracket as against downward displacement. It is manifest that the continuance of the up-anddown movement of the handle or lever 13 will result in an intermittent upward movement of the lifting-bracket, so that the latter will climb the standard. It is to be particularly noted that should the gripping-block 11 slip in its engagement with the standard the pawl 15 will at once come into engagement with a tooth of the standard and prevent any but a very slight downward play of the bracket. 1 Hence the pawl 15 coacts to a marked, degree with the gripping or clutchloop principle of the bracket to insure that the latter will be maintained securely at an approximate elevation in which it is desired it shallremain. It is obvious also that the device is equally as applicable for use as a wire-stretcher. As an example of one adaptatioriof the device for this use one strand or wire to be tightened may be detachably clamped between the parts 18 and 19, another part of the wire to be spliced with the first-named part may be secured in the notch 17 of the standard," and then the handle 13 may be actuated back and forth until the two parts of the wire are brought to ether for splicing. It is obvious also that t e device may be used for various other purposes.

From the foregoing descript on, in connection with the accompanying drawings, it will be seen that we have provided an improved construction of lifting device or Wire-stretcher that embodies novel features of both the clutch-loop principle and pawl-and-ratchet principle combined and that the device is durable in construction, eflicient in operation, and composed of comparatively few and simple parts that may be readily assembled and as readily detached from each other for purposes of repairing or the like.

Having thus described the invention, what is claimed as new is 1. A device of the character described, comprising a standard, a runner mounted to slide on said standard and provided with a gripping-block designed to bite against one ace of the standard to maintain the runner at different elevations, an actuating-lever pivotally connected to said runner, and a pawl connected to said lever, the standard being provided on one face with ratchetteeth designed for engagement with said pawl.

2. A device of the character described, comprising a standard provided along one edge with ratchet-teeth, a lifting-bracket or runner mounted to slide on said standard and provided with a toothed gripping-block designed to bite against the standard, an actuatmg-lever provided with a forked end embracing the toothed edge of the standard and. pivotally connected to said runner, and a pawl eccentrically mounted between its ends in the fork of said lever and designed for engagement with said teeth.

3. A device of the character described, comprising a standard T-shaped in cross-section, and having one of its edges provided with ratchet-teeth, a lifting-bracket or runner provided with inturned flanges taking around said standard and slidably connecting the runner to the standard, a toothed gripping-block carried by said runner and designed for engagement with the rear face of the standard, means for disengaging said toothed block from the standard, an actuating-lever provided with a fork embracing the toothed edge of the standard and pivotally connected to the runner, and a pawl eccentrically mounted between its ends in the fork of the lever and designed to be rocked by gravity into engagement with the teeth below the lever whereby it will act as a fulcrum for the lever in lifting the runner, as and for the purpose set forth.

4. A device of the character described, comprising a standard T-shaped in crosssection and provided on one edge with ratchetteeth, a lifting-bracket or runner provided with inturned flanges engaging side edges of the standard and slidably mounting the runner thereon, the runner being also provided with oppositely-extending trunnions-and a hollow chamber, a dog slidably mounted in said chamber and provided with a toothed gripping-block for engagement with the rear face of the standard, a hand-lever connected to said dog and having a] cam-surface designed for engagement with the runner and arranged to draw the do downward so as to remove its gripping-bloc from engagement with the standard, a spring designed to press the dog toward the standard, an actuatinglever having a fork embracing the toothed edge of the standard and pivotally connected to the runner, and a gravity-pawl eccentric-- ally pivoted between its ends to the lever and projecting below the same and designed for engagement with the teeth below the lever whereby it will act as a fulcrum for the lever, as and for the purpose set forth.

5 In testimony whereof we aflix our signatures in presence of two witnesses.

JAMES M. HUDSON n E. W. EDIN'GTON.

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