US1001066A - Lifting-jack. - Google Patents

Description

A. NEAL.

LIFTING JACK.

' APPLIOATION FILED 11017.14, 1910.

1,001,066. I Patented Aug. 22, 1911.

ZBHEETS-BEEETI.

' L'OLUMBIA PLANOGRAPH cu., WASHINGTON. n. c.

A. NEAL.

LIFTING JACK. APPLICATION FILED 11011.14, 1910.

1,001,066, 1 Patented Aug. 22, 1911.

2 BHEETS SHEET 2 g ykzkesses, i I Java/0&2?

ALBERT NEAL, OF cEhT'lflillit, INDIANA.

LIFTING-JAGK.

Application filed November 14, 1910.

Specification of Letters Patent.

Patented Aug. 22, 1911.

Serial No. 592,245.

To all whom it may concern:

Be it known that I, ALBERT NEAL, a citizen of the United States, residing at Center, in the county of Howard and State of Indiana, have invented certainnew and useful Improvements in Lifting-Jacks, of which the following is a specification.

This invention relates to lifting-jacks and more particularly to lever-operated jacks suitable for lifting automobiles, wagons, and heavy objects in general; for stretching wire, pulling stumps, and the like, and the object of the invention is to provide means whereby a single lever may be used at the will of the operator to advance or retract a lifting bar or stafi.

I accomplish the objects of my invention by the mechanism illustrated in the accompanying drawings, in which Figure 1' is a horizontal section on the line 11 of Fig. 5. Fig. 2 is a transverse vertical section on the line 22 of Fig. 1. Fig. 3 is a vertical section on the line 3-3 of Fig. 1. Fig. 4 is a vertical section on the line 44 of Fig. 1. Fig. 5 is a side eleva tion of the middle portion of the jack, and Fig. 6 is a perspective view of one of the pawls.

Like characters of reference indicate like parts throughout the several views.

Referring to the drawings, 10 is the base and 11 the hollow standard or support extending up from said base and preferably integral therewith. Formed near the upper end of the hollow standard 11, through diametrically opposite sides-thereof, are openings 12, and below these openings on opposite sides from the sides with the openings 12, are the lugs 13. The latter terminate in vertical ribs and are rounded to facilitate the oscillatory movement thereon of a rocking head 14. The base of the standard 11 will preferably be round in cross section to receive a staff or lifting bar 16, round in cross section. This lifting bar 16 is provided with annular notches 17, forming it into a rack-bar, which will be engaged upon diametrically opposite sides by a pair of oppositely disposed dogs or pawls 18 and 19. The latter are pivotally mounted in the rocking head 14. The lower end of the lifting bar 16 is provided with an eye 22 for the attachment of-a cable or hock when the jack is used for stretching wire, or cables, or for lifting loads below its base 10.

The head 14 is substantially a rectangular frame in the opening of which the squared notches 27 to receive the rounded lugs 13,

upon which the head is adapted to be rocked, and they also have the inwardly extended trunnions 25 in two pairs, one pair on each side of the standard 11.

The dogs 18' and 19 are substantially alike in size and shape. They are each provided with a pair of hooks 26 to engage the trunnions 25. The upper ends of the pawls are extended through the openings 12 of the hollow standard and these ends are shaped as shown, to engage the teeth of the lifting .bar 16. Wrapped around the trunnions 25 are coiled springs 32, the outer arms 31 of which bears against the ends of the head 14,

' and the inner arms 35 of which bear against the adjacent one of said dogs 18 or 19, and force the upper ends of said dogs into constant contact with the notches 17 of the lifting bar 16.

The device as thus far described is sufficient for extending or raising the bar 16, but not for retracting or lowering the bar, and I will now describe the mechanism by which the latter is accomplished.

M'ounted in vertical channels to serve as guides in the standard 11, are the bars 40, which have longitudinal slots for the passage therethrough of securing screws 41, whereby the bars are capable of longitudinal adjustment limited by the lengths of their said slots. The upper ends of bars 40 terminate with outwardly turned lugs or ribs 42, extending transversely of the bars, which contact with projections 43 on the inner sides of the dogs 18 and 19, upon a suflicient downward movement as produced by the oscillatory movement of the hand lever in excess of that required for extending or raising the bar 16; and the contact of projection 43 with a rib 42 forces the upper rib 42 of bar 40 and by the engagement thus made the bar 40 is carried up with the pawl until the bar is arrested by contact of its screw 41 with the lower end of its slot. This causes the lug of bar 450 to be withdrawn from its notch, but at a point above the shoulder on bar 16 which just previously engaged the 'pawl. The load on the jack is then resting on the opposite pawl and will be lowered by continued travel of the hand lever until supported on the first pawl by contact of the latter with the next upper shoulder on bar 16. This operation is a continuous one merely by giving the hand lever a sufiiciently longer throw or travel than for raising the load.

The hooked ends of the pawls are kept a; from disengagement with their trunnions when lowered, by the oblique extensions L5, from standard 11.

Having thus fully described my invention, what I claim as new and wish to secure by Letters Patent of the United States, is

1. In a lifting-jack, a standard, a notched lifting bar, a frame supported by the standard, a handle for rocking the frame, a' pair of pawls carried by the frame and adapted to'alternately engage notches on opposite 2. In a lifting-jack, a standard, a notched lifting bar, a frame supported by the stand ard, a handle for rocking the frame, a pair of pawls carried by the frame and adapted to engage notches on opposite sides of the lifting bar to extend the bar when the frame is rocked, said pawls having under-side extensions, and projections from the standard to engage said projections of the pawls by a still greater rocking travel of the frame and alternately hold the pawls out of engagement with the next shoulder above to permit retraction of the lifting bar, said projection being slidable on the standard to continue said disengagement until the pawl has passed the shoulder.

3. In a lifting-jack, a hollow standard having oblique extensions, a notched lifting bar mounted in said hollow standard, a frame rockingly supported by the standard and having inside pawl-supporting trunnions, a handle for rocking the frame, a pair of pawls having hooked lower ends to engage the trunnions of the frame, said en- 1 gagement being maintained by contact of the hooks with the oblique extensions of the standard, and upper ends adapted to engage notches on opposite sides of the lifting bar to extend the bar when the frame is rocked. said pawls having under-sideextensions and adjacent notches, bars longitudinally slidable on the standards, said bars having extensions to engage said notches of the pawls when the pawls are brought into contact therewith-by a suflicient rocking travel of the frame to hold the pawls out of engagement with the next shoulder above and permit retraction of the bar.

In witness whereof, I, have hereunto set my hand and seal at Indianapolis, Indiana,

this 12th day of August, A. D. one thousand nine hundred and ten.

ALBERT NEAL. 1. 5.

Witnesses:

F. W. VVOERNER, L. B. WOERNER.

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

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