US794735A - Lifting-jack. - Google Patents

Description

PATENTED JULY 18, 1905.

s. R. PAYNE.

LIFTING JACK. I APPLICATION TILED NOV- 28,1904.

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No. 794.735. PATENTED JULY 18, 1905. s. R. PAYNE.

LIFTING JACK.

APPLICATION FILED NOV. 28,1904.

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NITED STATES Patented July 18, 1905.

PATENT OFFICE.

SAMUEL R. PAYNE, OF RIDDLETON, TENNESSEE, ASSIGNOR OF ONE-THIRD TO BARNETT D. AUSTIN AND ONE-THIRD TO CHARLES E. YAUGEY, OF

RIDDLETON, TENNESSEE.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 794,735, dated July 18, 1905.

Application filed November 28, 1904. Serial No. 234,599.

ments in Lifting-Jacks, of which the follow-- ing is a specification.

This invention provides improvements in lifting-jacks, the invention being particularly designed for use upon wagons or the like and readily adapted because of the great power incident to the structural arrangement of the parts for extracting posts, stumps, or doing work of like character. The invention aims to simplify to the greatest extent the structure of this class of hoisting means, at the same time increasing the power of the device to a maximum.

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.

2 5 While the invention may be adapted to different forms and conditions by changes in the structure and minor details without departing from the spirit or essential features thereof, still the preferred embodiment thereof 0 is shown in the accompanying drawings, in

which Figure 1 is a perspective View of a liftingjack embodying the essential features of the invention. Fig. 2 is a vertical sectional view.

Fig. 4 is a sectional view on the line X X of Fig. 2. Fig. 5 is a perspective View of the upper portion of the standard. Fig. 6 is a detail perspective view of the cam-lever. Fig. 7 is a detail perspective View of the operating-lever and lifting- 'bar.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

In carrying out the invention the liftingjack is not only designed for hoisting and elevating parts, but the same may be utilized in view of the provision of special devices for stretching wires or accomplishing a like func 5 tion, and this last feature will be pointed out more clearly as the description proceeds.

Generally describing the device, the jack comprises a suitable standard 1, provided at its lower end with a base 2, which is preferably removable and may be detachably secured to the standard in any suitable manner in the contemplation of the invention. The upper end of the standard 1 has a laterally-extending handle 3 projecting therefrom, and this 0 handle is grasped in supporting the standard when the jack is being operated. The hoisting means carried by the standard 1 consists of a movable head 4, which is slidable vertically of the standard 1, thelatter passing there- 5 through. The head or bracket 4 extends outwardly from the standard 1 and curves upwardly somewhat, as shown at 5, in order that chains or suitable tackle may be readily secured to the head when the jack is used for 7 extracting a stump, post, or like part. The head 4 is primarily mounted upon a lower runner 6, also vertically movable upon the standard 1, and a lifting-bar 7 is mounted at its lower end in the runner 6, the upper end of said bar 7 being provided with an opening lateral therethrough through which extends a pin 8, projected from an operating-lever 9, pivoted to the bracket or head 4. The lever 9 is of somewhat bell-crank form at its lower 30 end and is provided with a pivot-pin 10, which is mounted in the part 4. The pivot-pin 10 extends laterally from the lower end of the lever 9 through the head 4, being secured to the latter by means of a nut or like device 11. The 5- pin 8, which connects the lifting-bar 7 to the head 4, also passes into the head, and this pin operates in an arcuate slot 12, provided in one side of the part 4 aforesaid. Pivotal movement of the lever 9 upon the head 4 will raise and 9 lower the lifting-bar 7. The lower end of the lifting-bar 7 is suitably mounted in a bearing 13 in the lower runner 6, and'from this lower extremity projects an extension 14, a spring 15 being interposed between the extension 14 and the upper portion of the runner 6. The

runner 6 is designed to clutch the standard 1, so as to elevate the head 4 with astep-by-step movement, and the spring normally tends to hold the runner 6 in engagement with the standard 1 when the weight of the head and the part carried thereby is sustained by the portion of the runner 6 engaging with said standard. In the movement of the lever 9 the head 4 is forced upwardly as the lever moves downwardly, and as the lever moves upwardly the runner 6 is lifted, the load being sustained at this time by a second runner 16, which is mounted upon the standard 1. between the runner 6 and the head or bracket4. The runner 16 is of a form somewhat similar to the runner 6, and downwardly extending from the head 4, upon the rear side thereof, is an arm 17, the lower extremity of which is provided with an extension 18, between which and the upper portion of the runner 16 is interposed a second spring 19, the mounting of the parts 17, 18, and 19 being relatively the same as that of the parts 7, 14, and 15. The spring 19 normally holds the runner 16 in clutch engagement with the standard, so that when the lever 9 is raised to lift the lower runner 6 the upper runner 16 will engage the standard 1. and support the load preparatory to the next downward movement of the lever, which will throw the load upon the lower runner and cause the head 4-to move upwardly, the step-by-step movement being continued in this manner until the load has been lifted the necessary distance. In order that the clutch members 6 and 16 may be quickly disengaged to lower the part 4, a cam-lever 20 is mounted upon a side of the bracket or head 4, and the cam 21 of-this lever is adapted to engage a lateral projection 22 upon the upper runner 16 to cause the adjacent end of the runner to move downwardly and permit free movement of the same along the standard 1. For the same purpose a foot-piece 23 projects from the lower runner 6, and this foot-piece may be readily actuated by the foot of the operator so as to disengage the lower runner in a manner readily comprehended.

' The wire-stretching means provided upon the jack consists, essentially, of clamp-bars 24, carried by links 25, which latter are pivoted at one end to each clamp-bar, the opposite end being pivotally supported. At the upper end of the standard the links 25 are pivoted to the handle 3 and the other clampbar is mounted upon the bracket or head 4, being carried by a plate 26 secured thereto. The handle 3 and the plate 26 are each provided with an extension 27 which cooperates with the adjacent clamp-bar 24 in gripping the wire. The wire-stretcher would of course be operated by movement of the lever 9 and adjustment of the bracket or head 4 thereby in the usual manner.

Having thus described the invention, what is claimed as new is In a lifting-jack, the combination of a standard provided at its upper end with a handle and at its lower end with a base, a head slidable vertically of the standard and provided with an arcuate slot in the side thereof, an operating-lever pivoted to the head, a pin projecting from the lever adjacent the point of pivotal support thereof and operating in the arcuate slot aforesaid, a lower runnermounted upon the standard, a lifting-bar having its lower end mounted in said runner and having its upper end mounted upon the pin projecting from the lever, an extension projecting from the lower end of tlie lifting-bar, a footpiece carried by the lower runner, a second runner mounted between the lower runner and the head, a downwardly-projecting arm carried by the head and mounted in the second runner, an extension projecting from the lower extremity of said arm, and springs interposed between the extensions of the arm and the lifting-bar and cooperating with the respective runners adjacent these parts for the purpose specified.

In testimony whereof I afiix my signature in presence of two witnesses.

SAMUEL R. PAYNE.

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