US1662921A

US1662921A - Lifting jack

Info

Publication number: US1662921A
Authority: US
Publication date: 1928-03-20
Anticipated expiration: 1945-03-20

Description

Patented Mar. 20, 1928.

ROBERT IRA HARRIS, OF PUNTA GOBDA, FLORIDA.

LIFTING JACK.

Application filed June 22,1927. SeriaLNo. 200,738.

- This invention relates to a lifting jack of the type to be used with automotive vehicles and the principal object is the provision of such a structure which will efficiently raise and lower such a vehicle or other structure, quickly and withouta great deal of effort on the part of the user.

To this end, the invention contemplates two uprights or supports secured together andfto a base, the, opposite longitudinal edges vof the uprights" being notched. A handle is inserted between the uprights and carries two pawls, each of which may be made to engage the notches on one side of the uprights in a step by step manner. A load supporting element is also carried by the handle in a pivotal manner, movement thereof about its pivot being prevented by a yoke straddling the rear end thereof and which may be made to engage or disengage the load supporting element by means of a trip extending out on the handle conveniently within reach of the operator.

The invention further consists of the novel arrangement, combination and construction of parts herein shown and described.

In the embodiment illustrated;

Fig. l is a side elevation of the device showing the load supporting element in released position in dotted lines.

Fig. 2 is a plan View of Fig. 1 partly in section.

Fig. 3 is a front view of Fig. 1 partly broken away.

Fig. 4 is a side View of the device with handle folded.

Fig. 5 is a top View of the standards.

In the drawings, I have shown at 1 a base to which two substantially U beam uprights 2 are secured in a spaced apart manner as by spacer 3 and rivet 4.

Between the uprights or standards 2, I provide a handle consisting of a long reach section 5 to which is pivoted a short section 6. The short section carries an enlargement 7 suitably secured thereto and substantially fitting the interior contour of the standards 2, so that the section 6 may readily'slide up and down therebetween.

On each side of the standards 2, the short handle section 6 is provided with

pawls

8 and 8 each pivoted thereto and connected by coil spring 9. The ends of the pawls are adapted to fit notches 10 arranged on each longitudinal edge of the standards 2.

desirable that after Carried onthe same pivot with pawl 8. is a load supporting element 11, the rear end of which extends beyond the hinge between the short and long sections of the handle. A yoke 12 pivoted to the long handle section 5 is adapted to straddle the element 11, which not only prevents the same from tipping up and releasing the load thereon, but also prevents the two handle sections from moving relative to each other. This in effect makes the handle sections 5 and 6 a unitary member. A trip 18 attached to the top of the yoke 12 extends backward on the handle section 5 and terminates in a lever 14 within reach of the operator.

In operation, assuming the parts 'to be located near the bottom of the standard and the yoke engaging the rear end of the load supporting element, by manipulation of the handle section 5 in an up and down manner, the

pawls

8 and 8 will advance up the standards, passing from notch to notch until the load engaging element comes in contact with the vehicle or other structure to be fted. Further similar movement of the handle will effectively lift the load.

When it is desired to release the load from the jack, all that is necessary is to operate the lever 14 so that the yoke disengages the rear end of the load engaging element, which will instantly tip up to the dotted position shown in Fig. l and the load will drop to its initial position.

By manually disengaging the pawls from the notches, against the action of the coil spring, the short handle section may be slid to the bottom of the standards. The load engaging element being in tipped up position, the long handle section can be moved in relation to the short handle section and folded up close against the standards, thus making a compact article.

It will be apparent that by providing the above structure, it is not necessary to move the jack backwards in a step by step manner although this can be done by manually releasing the pawls one at a time. As a jack of this type is most frequently used when changing tires on an automobile, it is the tire has been changed, the car be lower quickly. With this jack, all that is necessary is to pull the trip lever and the load will be released.

At the same time, I have provided a most simple construction, which enables the long handle to be folded when not in use, but

which automaticallyprevents folding while in use.

What is claimed is:

1. A lifting jack comprising a base, standards thereon a handle carrying a load engaging element, and means alsoon the handle for raising the same up the standards in a step by step manner, and means to release the load engaging element into a load disengaging position.

2. A lifting jack comprising a base, standards thereon, a handle carrying a "load engaging element, and means also on the handle for raising the same up the standards in a step by step manner said handle comprising two sections pivoted together, the load engaging element overlyingthe'piv- 0t and means to hold the saidelement'in said position.

3. A liftin jack comprising a base, standards thereon a handle carrying a load engaging element, and means also on the handle for raising the same up the standards in a step by step manner, said handle comprising two sections pivoted together,

the load engaging element'overlying the pivot and means to hold the said element in said position, said load engaging element being pivoted to one handle section, said holding means comprising a yoke pivoted to the other-handle section.

4-. A lifting jack comprising a base, two opposed .iUV beam spaced apart standards thereon, a handle having a long and a short section pivoted together, the short section having an enlargement slidable within the standards, pawls on each end of the short section engageable with notches on the standard to move thesection up the standard in a step by step manner, a load engaging element pivoted to the short handle section and having an'end extending'over the pivot betweenhandle sections, a yoke pivoted to the long handle sect-ion and straddling the end of the load engaging'element, and a trip for disengaging the yoke for the load engaging element. 7 v In testimony whereof, I aflix my signature.

ROBERT IRA HARRIS.