US1082412A - Lifting-jack. - Google Patents

Description

S. ORAIG.

LIFTING JACK.

APPLIOATION HLBD Nov.19, 1912.

1 ,082,41'2. Patented Dec. 23, 1913.

2 BHEETS-SHBET 1.

S. GRAIG.

LIFTING JACK.

APPLIOATION I'ILBD Nov.18, 1912.

Patented Dec. 23, .1913.

5. C Taiq. Wf/limeooeo SAMUEL CRAIG', OF DECATR, ILLINOIS.

LIFTING-JACK.

Lesznie.

Specfication of Letters Patent.

Application filed November 19, 1912.

Patented Dec. 23, 1913.

Serial No. 732,298.

To all whom t may Gomera:

Be it known that I, SAMUEL CRAIG, a citizen of the United States, residing at Decatur, in the county of Macon and State of Illinois, have invented new and useful Improvements in Lifting-Jacke, of which the following is a specification.

This invention relates to lifting jacks, the object in view being to provide a particularly convenient and pract-ical form of jack, especially designed with reference to the needs of automobile owners, the said jack being adapted to be operated by foot power, leaving the hands of the operator free for other work, and also obviating the necessity of stooping.

A further object of the invention is to simplify and improve the construction of jacks of the class'described, doing away with some of the moving parts, such as the movable pawls commonly employed in connection with the ratchet mechanism.

VVith the above and other objects in view, the invention consists in the construction, combination and arrangement of parts, as will be hereinafter more fully desoribed, llustrated in the aceompanying drawings, and pointed out in the claims hereunto appended. j

In the accompanying drawingz-Figure 1 is a side elevation of a jack embodying the present invention. Fig. 2 is a Vertical longitudinal section through the same. Fig. 3 is a horizontal cross section taken in line with the ratchet and pinion shaft. Fig. t is a perspective view of the Operating lever detached. Fig. 5 is a side elevation of the jack, partly in section, showing the supplemental detachable hand lever applied thereto. Fig. 6 is a plan View of the construction illustrated in Fig. 5.

Referring to the drawing, l designates a stand, in which is arranged a vertically sliding rack bar 2, provided at the upper end thereof with a suitable head or rest 3 to support the load to be lifted. Journaled in the stand is a combined ratchet and pinion shaft 4, fast upon the central portion of which is a pinion 5 which meshes with the rack bar 2 for raising and lowering the same.

At opposite sides of the casing of the stand 1 and fast on the shaft ll are ratchet wheels 6 which are engaged by fiXed ratchet teeth 7 on the inner sides of the two side bars 8 of the Operating lever, these two side bars 8, together with the connecting pedal bar 9, forming the Operating lever, and the inner ends of the side bars 8 are provided with slots 10 to receive the shaft f, upon the ends of which are placed retaining nuts 11, which hold the parts of the jack together. The pedal bar 9 is preferably in the form of a sleeve or roller surrounding a bolt 12 which passes through holes in the side bars 8.

Extending downward below the podal bar 9 are feet 13 which are adapted to rest upon the ground and support the pedal bar 9 at a sufficient distance above the ground to enable the operator to insert his foot beneath the same, for the purpose of elevating the outer end of the lever. By placing his foot upon the top of the pedalbar 9, said lever may be readily depressed. This does away with the necessity of using either hand, and also avoids the ne'cessity of stooping in order to operate the jack.

14 designates a dog which engages the teeth of the vertically movable rack bar 2 to sustain the same at any desired elevation. The dog 14 is held normally in engagement with the rack bar by means of a spring 15 located behind the same and the dog is operated by a lever 16 which is fulcrumed at 17 on the stand or frame of the said jack, said lever being' provided with an extension 18, for a purpo-se which will hereinafter appear.

By providing the slots 10 and making the ratchet tee-th 7 fiXed, it will be observed that I do away with pivoted pawls for operating` the ratchet wheels 6, as the lever itself moves, so as to throw the fixed pawls into and out of engagement with the ratchet Wheels (i, the detent 14 holding the rack bar 2 at any point to which the same may be adjusted.

In order to enable the jack to be operated with facility by hand instead of by foot, I provide a supplemental and a detachable hand lever 19, shown in Figs. 5 and G. This lever is provided at its inner end with a fork 20 the arms 21 of which are terminally slotted as shown at 22, adapting` said arms to embrace oppositely located studs 23 extending inward from the side bars S of the lever above described. The lever is also provided with a lug` 24 arranged close to the pedal bar 9 and has a binding screw 25 threaded therethrough and adapted to bear against the pedal bar 9 for forcing the arms :21 into close engagement with the studs 28 thereby fastening the supplemental lever 19 securely to the lever 8. At its outer end, the lever 19 is provided with a suitable hand grip 26 and adjacent thereto is a finger lever 27 pivotally connected at 28 to the lever 19. From the lever 27 a connecting rod 29 eX- tends to the projection 18 on the lever 16, thereby enabling` the last-mentioned lever to be operated from the eXtremity of the lever 19 so as to correspondingly move the pawl let into and out of engagement with the teeth of the rack bar 2. r1`he rod 29 passes through a suitable guide 30 on the lever 19 and a spring' 31 is interposed between the guide 30 and a should-er 32 on the connecting rod 29, the tension of the spring' 31 being exerted to maintain an engagement between the dog' 14 and the rack bar 2.

The construction above described enables the jack to be operated either by the combined hand and foot lever 8 or by the supplemental and det-achable hand lever 19, the last-mentioned lever, on account of its length, adding` to the facility and case with which the jack maj7 be operated but avoiding any necessity of the operator stooping' under a portion of the machine.

I claim:--

1. A lifting jack, embodying a stand, rack and pinion elements, a pinion shaft, an operating' lever comprising' side bars spaced apart to straddle said stand, and a pedal bar at a right angle to and connecting said side bars at their outer ends, said side bars having means to engage the pinion shaft, the lever being so combined with the pinion shaft that it may be operated from either side of the jack.

2. A jack comprising a stand, a vertically movable rack bar, a shaft journaled on the stand, a pinion on said shaft engagng the rack bar, an Operating lever comprising side bars spac-ed apart and journaled on said shaft, a pedal bar connecting said side bars, elevating feet extending' below the pedal bar to leave toe space, and pawl and ratchet mechanism on said lever and shaft.

3. A jack, comprising a stand, a vert-ically movable rack bar, a shaft journaled on the stand, a pinion on said shaft engag'ing the rack bar, an Operating' lever comprising side bars spaced apart and journaled on said shaft, a pedal bar connecting said side bars, pawl and ratchet mechanism on said lever and shaft, pins on said side bars, a supplemental hand lever having' forked and slotted arms at one end thereof to engage said pins, a clamping screw for fastening' said supplemental hand lever to the pedal bar, and manually Controlled dog` Operating connections on said supplemental hand lever.

In testimony whereof ailix my signature in presence of two witnesses.

SAIEUEL CRAG.

Wit-nesses:

ELI S. PARKs, WILL E. CooMBn.

Copies of this patent may be obtained for five cents each, by addressing the Commissoner of Patents, Washington, D. 0.

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