US1260510A - Lifting-jack. - Google Patents

Description

H. GARDEN.

LIFTINGJACK.

APPLICATION FILED APR. 3. 1911.

LQGOlG. Patented Mar. 26, 1918.

INVENTOR www@ ATTOR NEY sus aan caricia.

l 'aman cannula, or Darst',V TENNESSEE.

LIFTING-JACK.

Specification 1of Letters Patent.

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Application filed April 3, 1917. 'Serial No. 159,498.

To all whom t may concern:

Be it known that l, Hilmar GARDEN, a citizen of the United States, residing at Daisy, in thel county of Hamilton and State of Y Tennessee, have invented certain new and- `a lifting'j'ack comprising a suitably braced frame including bifurcated members each of which has a plurality of transverse apertures wherein an adjusting'bolt may be fitr ted so that alever arm may be mounted' upon A the bifurcated members to obtain a leverage of either the iirst or third classes.

j Another object of the invention is to lpio vide a Vlifting jack as described, the movable lever `arm being adapted to receive an ad justable leg having a foot whereby such objectsV as the Asills olf houses, mining cars, etc., may be lifted.` Y

Other objects and advantages will appear from the following specification, reference being had to 'the accompanying drawing in which: l Y

Figure 1 is a side elevation of the lifting jack showing the adjustable leg on the movable lever as being applied in raising a large object, Y

Fig. 2 is a p lan view of the parts shown in Fig. 1, l

Fig. 3 is a section on thef'line 3T3 of Fig. 1, and l Fig. 4 is a detail perspective view of the adjustable leg. Y

ln carrying out my invention I provide a fulcrum standard 1 which includes the upper and lower bifurcated portions '2 and 3 respectively. The `bi'furcat'ed portions ex-` which similarly bifurcated at its upper and lower portions as designated at 9 and 10. The bifurcated portion 9 is provided with apertures 11 through which a holding bolt 12 is adapted to pass and serves to secure the movable lever 7 in its adjusted po` sitions should it be found necessary to employ such a bolt in the use of the lifting jack.

ln such an instance it will be understood, that pressure brought to bear upon the end of the lever 7 beyond the second fulcrum standard 8, will be difficult to maintain and therefore the use of the holding bolt 12 will be found of great aid.

A bridge bar 13 is seoured'at its ends as at la in the lower bifurcated portions 3 and 10 of thefirst and second Julcrum standards 1 and`8. 1t will be observed that the second fulcrum standard 8 lis somewhat shorter than is the irst fulcrum standard 1. 1t will also be seen` that the standards are not disposed vertically but are inclined at an an gie with respect to the bridge bar 13. It his `been found from practicalexperience that` to the object to be lifted. The handle por tion 17 of the lever 7 is somewhat narrowed from the thickened portion 15, so that a convenient grip may be gotten thereon; A series of apertures 18 is formed near the frontend of the lever while another series of apertures 19 is formed therein near the handle 17. lIt will be understood from Fig. 1 that the bolts 6 and 12 are adapted to pass through the respective series of apertures 18 and 19.

An adjustable leg Y20 having a bifurcated upper end 21 is adapted to be hung upon the front end of the lever 7 by the means of a bolt 22 which passes through apertures 23 in the bifurcated portion 21 and through one of the apertures of the series 18,.

A foot 24: is formed at the lower end of the leg 20. It is some times desirable and necessary to employ the leg 20 as when an object is of such a nature that it cannot readily be engaged by the heel 16 of the lever 7. Such an instance may be represented when a mining car has left thetrack and tilted over so that no hold can be gotten thereon by the heel 16 of the lever 7. Obviously by forcing the foot 211 beneath the car and then moving the lever 7 upon its fulcrum 6 until the supporting bolt 22 may be passed through the then complemental apertures 23 and 18, pressure then brought to bear on the handle portion 17 of the lever 7 will effect the elevation of the derailed car.

The operation and application of the device is as follows. The lifting jack frame with its fulcrum standards 1 and 8 is moved up t0 an object to be lifted and supported in place by the hands of the workmen until the lever 7 is mounted in position on its fulcrum bolt 6 and the heel 16 thereof is brought into engagement with the object and a slight pressure is brought to bear upon the handle 17. It will be understood that the slight pressure on the handle 17 will serve to hold the lifting jack frame in position and it will no longer be necessary to furnish support for the frame through a manual agency.

The adjustment of the lever having been secured, continued pressure upon the handle 17 will of course move the heel 16 upwardly and thus raise the wei ght. The holding bolt 12 may be slipped into the various apertures 11 in the fulcrum standard 8 as the handle 17 is moved downwardly.

The adjustment of the lever 7 on the fulorum standard 1 will be recognized as that of a lever of the .first class. Should it be found necessary to change the adjustment so as to form a lever nf the third class, the fulcrum bolt 6 may be removed and the holding bolt 12 employed as the fulcrum bolt. It will be understood that at this time the thickened portion 15 will serve as a hand-grip where the pressure is applied and a weight hung upon the heel portion 16 will consequently be elevated.

Referring again to the specific embodiment as illustrated in Fig. 1 it will readily be observed that upon downward movement of the handle 17 the front end of the lever 7 will move upwardly and the edge of the leg 20 will slide over the rearwardly inclined surface of the fulcrum standard 1. The fulcrum standard 1 thus not only serves in its true capacity as a support for the 1. In a lifting jack of the class described the combination of a pair of similarly constructed standards, each standard being bifurcated at its ends to form central webs, a bridge bar secured between the bifurcations of the lower ends spacing the standards apart, a movable lever pivotally mounted upon one standard between the bifurcations thereof, said lever being adapted to be swung within the re? maining bifurcation of the remaining standard, means for holding said lever in a set position and an adjustable leg connected to one end of said lever.

2. In a lifting jack of the class described, the combination of a main standard and a secondary standard, said standards having bifurcated ends, thus forming central webs, said standards being parallel to eachother and slanting to one side, a bridge bar having its ends positioned in the bifurcations adjacent the lower end of said standards, thus holding said standards against accidental displacement, a' movable lever pivotally mounted upon the main standard, said lever being adapted to be swung within the remaining bifurcation of the secondary standard, an adjustable leg pivotally mounted upon one end of said movable lever, whereby when said lever is swung downwardly to elevate the adjustable leg, to lift an article,

the slanting of said standard will compenthe arcuate movement of the end of sate for the lever, thus cansino the leg to ride upon the outer surface of t e main standard, and said slanting construction also permitting the jack to be moved contiguous to thearticle to be lifted, although providing sufficient space for the adjustable leg'at the end of the lever to which the same is secured. j

of the standards, thus' In testimony whereof I affix my signature i in presence of two witnesses.

VHIRAIW GARDEN.

Witnesses:

T. H. NEWBERRY, J. W. BEAN.

Copier ot this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

Washington, D. G,

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