US1140907A - Lifting-jack. - Google Patents

Description

C. S. LEHMAN. LlFTlNG JACK. APPLICATION min JUNE 8,1914.

Patented May 25, 1915.

mwm- 2 C Amman/Y o1,

THE NORRIS PETERS 60.. PHGTO LITHOH WASHINGTON, D 64 mmwa C. S. LEHMAN. 'LIFTING JACK.

APPLICATION FILED JUNE 8, 1914.

Patented May 25, 1915.

2 SHEETSSHEET 2.

F., la

TH? NORRIS PETERS Ca, PHOIO-LITHQ, WASHINGTON. D.

T FFTQEQ CHRISTIAN S. LEHMAN, 0F LAWN, PENNSYLVANIA.

LIFTING-JACK.

Liaaeoa.

Application filed June 8, 1914.

To all whom it may, concern Be it known that I, CHRISTIAN S. LEH- MAN, a citizen of the United States, residing at Lawn, in the county of Lebanon and State of Pennsylvania, have invented certain new and useful Improvements in Lifting- Jacks; of which the following is a specification.

This invention comprehends certain new and useful improvements in lifting jacks, and has for its primary object to provide a device of this character which will be constructed in such manner that the lifting lever may be readily locked in adjusted position longitudinally of the standard in such manner that the locking means will serve as a pivot for the lifting lever and prevent the lifting lever from moving longitudinally upon the standard while being applied to lift the device with which it is engaged.

Another object of the invention is to provide a lifting device which will be constructed in such manner that the lifting lever may be adjusted longitudinally of the standard and secured in adjusted position in such manner that movement of the lifting lever in one direction will serve to clamp the same upon the standard and make it impossible for the weight upon the forward end of the lever to force the latter downwardly.

This invention has for a further object to generally improve and simplify the construction and operation of the various parts of a device of this character and increase the efficiency thereof without materially increasing the cost of the same.

With these and other objects in view as will become apparent as the description proceeds, the invention consists in certain novel features of construction, combination and arrangement of parts as will be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawings, in which:

Figure 1 is a side elevation of my improved form of lifting lever. Fig. 2 is a front elevation thereof. Fig. 3 is a top plan view. Fig. 4 is a transverse section on the plane of line H of Fig. 1. Fig. 5 is a vertical sectional view on the plane of line 5-5 of Fig. 2, looking in the direction indicated by the arrows.

Referring more particularly to the draw- Specification of Letters Patent.

Patented May 25, 1915. Serial No. 843,836.

ings by numerals, l designates the base from which the divided standard 2 projects upwardly, the end of said divided standard being closed by the cross plate 3 connecting the parallel members forming said divided standard.

The divided standard 2 has a plurality of notches 4 formed in its rear edge and arranged longitudinally of the same for engagement by the central portion of the U shaped lifting lever support 5 mounted in a suitable bracket 6 secured to the lower face of the lifting lever 7 which projects through the divided standard 2. The free ends of the forwardly directed arms of the U shaped lever support are bent upon themselves, as shown at 6, for engagement with the flat face of the standard 2 and are then looped to form the eyes 9 within which are engaged the forward free ends of the spring member 10 which has its central portion twisted to form the eye 11 engaged with the head of the screw 12 or other suitable member secured to the upper face of the lifting lever 7 rearwardly of the standard 2, whereby upon pivotal movement of the lifting lever 7 to force the rear end downwardly and the forward end upwardly, the forward ends of the lever support 5 will be drawn upwardly and forwardly, thereby retaining the central portion of said member 5 in the proper notch 4. and forcing the bent ends 8 of said member 5 against the forward face of the standard 2, making it impossible for the member 5 to be disengaged from the notch 4 to permit downward movement of the lifting lever 7 upon the standard 2.

After the forward or working end 13 of the lifting lever 7 has been engaged with the wagon or other device which it is desired to lift or raise from the ground and the lever operated as above stated, said lifting lever 7 will automatically lock in operated position to retain the object in raised position and absolutely prevent movement of the lever 7 in either direction, by means of the locking bar 14: which has its upper end secured in the eye 15 depending from the rear end of said lever 7, while the main portion of said locking bar 1 1 is provided in its lower face with a series of forwardly and upwardly directed notches 16 to receive the main portion of the locking rod 17 extending transversely of the lower portion of the standard 2 and having its opposite ends 18 clamped around the lower portions of the parallel members forming the dividedstand ard 2 to clamp said lockingerodv7in, proper position, and it will'be evident that during the pivotal movement of the lifting lever, 7

to force the forward end 13 thereof up?- wardly, thenotches 16 ride over the-looking comes opposite the locking rod '17, when said locking-rod 17 will automatical1y-catch1in:

said notch 16 and lock the lifting lever. 7 against further movement in this; direction and asit will be'evident thatqthe movement of the lifting lever 7 in this direction: will be limited and slight, the member 5 will be retained in the proper notch-4 inthe standard 2 and thereby will prevent the lifting-lever 7 from sliding downwardly upon thestand ard 2. By disengaging the locking'bar 14 from the locking-rod'l7; however, the rearend. of the lifting lever 7 maybe-readily drawn upwardly and the lifting lever 7 drawn rearwardly untilthe member 5 *is dis-- engaged'from the'notch4, when said-lifting lever 7 may bev readily adjusted longitudinally ofsaid standard 2.

From the foregoing it? will be readily seen that I have -p rovided-a lifting j ack-which will be: of extremely simple construction and operation as well as-highly eflicient in use and onelin' which the parts will be formed in such manner that-*they may be readily and cheaply manufactured-andshould anyof such parts become worn-orbroken they may be readily replacedfata small-host;

While I the preferredembodiment of the. invention has 'been shown and described,iitwill be understood that"minorchanges in the details of 7 construction, combination and arrangement of parts may be made Without departing from the-spirit and scope of the invention as claimed or sacrificing any of theadvantages thereof.

Having thus described the invention what is. claimed as new, is

1. A device of the class described comprising 'the combination with a base and a standard projecting upwardly therefrom and havingnotches in one longitudinaledge, of a. lifting lever extending through said standard; a member pivoted to said liftinglever andiadapted'for engagement with one of 'saidnotches, means carried by said lifting lever and connected; with'qsaid member to clamp the sameupon' said standard and thereby prevent movement ofsaid lifting lever longitudinally ofsaid"standard, alocking;-rod carriedzbysaid-standard, and a locking bar carried by said'lifting "lever for engagementwith. said locking rod to lock the li-fting lever: against pivotal movement in onedi'rection:v

2. A device of'the class described comprising 1 a standard having notches formed in one; face abase for said standard, said standa-rclibeing formed of: spaced parallel members; a lifting lever extended between said parallel-members, a supporting member earried'by-said liftinglever for engagement with the notches :ofthe standard to secure saidjlift ingdeverin adjusted position longitudinally .of'said standard, means for clamping said-supporting member in engagement with said standard; and means for automatically docking the lifting lever against pivotal movement-"in" one direction. 7

In testimony whereof I affix-my signature in presence oftwowitnesses.

Witnesses:

G. H. REED; MONROE REED.

Gopiuorthlsipatentsmay be obtained @for five-cents-each;by addressing-the---Commissioner ot-Patenb.

Washington, D. G.

CHRISTIAN S. LEHMANJL v

Images