US1151962A - Lifting-jack. - Google Patents

Description

A. NEAL.

LIFTING JACK. APPLICATION FILED APR. 19(1915,

Patented Aug. 31, 1915.

2 SHEETS-SHEET 1.

1720672707, a zerfijl a/z,

COLUMBlA PLANOCIRAPH 420., WASHINGTON, B7 c.

A. NEAL.

LIFTING JACK.

APPLICATION FILED APR. I9. 1915.

Patented Aug. 31, 1915.

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\LULUMBIA PLANDURAPH 1:0..WASHINOTON, D. c

\ ALBERT NEAL. F KOKOIMO, INDIANA.

LIFTING-J'ACK- Specification of Letters Patent.

Application fildAprillS, 1915. Seria1No.22,430.

T all whom it may concern i Be it known that I, ALBERT NEAL,a. citizen of the United "States, residing at Kokomo, in the county of Howard and State of Indiana, have invented certain new and use ful Improvements in] Lifting Jacks, of which the following is a specification.

The object of this inventionis to provlde a lifting jack for pulling stumps, stretching wire, lifting heavy objects such as automobiles, wagons, stone, railroad rails and the like, wherein by av single lever the stafi or head of the jack will be advanced or retracted by the manipulation of said lever, or entirely released by other of its movements;

I accomplish the above and other ob ects which will hereinafter appear by the mech anism illustrated in the accompanying drawin s, in whichigure 1 is an end elevation of my improved jack; Fig. 2 a section on the line 22 of Figs. 1 and 3; Fig. 3, a section on the line 33 of Fig. 2; Fig. 4:, a section through the line 44 of Fig. 3, and Fig. 5

r a side elevation of the inner end of the lever showing the two pawls which the lever car rles.

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

The standard 6 has an expanded base 7 and has a longitudinal opening 8 in which a staff 9, makes a close sliding fit. The staff has a longitudinal rib 10 which enters and fills a slot in the standard and on the same side of the latter is an extension 11, to engage objects in some instances which are to be moved by the jack. The lower end of the stafl' has an eye 12 for the attachment of a wire or the like to be stretched, and at its opposite and upper end is a head 13 to contact the load. The staff also has notches 14 opposite the rib 10 which are engaged by pawls 15 and 16, carried by a lifting lever 17. The standard has a hollow extension 18, which is open at the bottom and lower front for the introduction and operation of the lever 17 and the sides of which extension have inner recesses 19 in the bottoms of which trunnions 20 on the lever 17 are journaled. Said recesses communicate with oth ers, 20, extending to the lower edges of the extension-walls whereby the trunnions are readily inserted and removed. The pawls 15 and 16 operate through a suitable opening 21 in the partition separating the hollow interior of the extension from that of the standard, with the notched bar.

The inner end of thelever has a top channel 22,-notched from the top on opposite side-walls to receive shafts 23 and21, re spectively, on which pawls 15 and 16 are mounted. The shaftsare flattened on one side to pass through, restricted mouths of the slots at certain positions of the pawls for assembly. Springs 25 and 26 are Patented Au "31', 1915.

wrapped around the respective shafts and s have their outer lowerends in contact with the bottom and adjacent side of the channel in the lever, and theinnerand upper ends in contact with notches in their pawls formed by recessing the pawls as shown. The springs act doubly, that is, to move the outer ends of thepawls toward the notched staff and to press the pawls in a direction opposite to theirsides on which the springs are placed. The pawl 1 5 hasalug 27 on the side opposite said spring, near its free end, which contacts by the action of the spring on the pawl with a lug 28 on the inner wall of extension 18, at certain positions of the lever, and at other positions of the lever with a cam rib 29, above the lug 28. The pawl 16 has a similarly located lug 30 which contacts with a lug 31 on the inner wall of the extension 18. The lugs are all beveled to allow the pawls 15 and 16 to swlng out freely, but to hold them out durmg the oppositeupwardstroke of the lever untll they have passed around their respective stationary lugs on their opposite sides fromthe staff, and over them, and are brought into play during the step-by-step retraction of the staff.

The two adjacent faces of the pawls have the respective lugs 32 and 33 which contact with each other when the lever is lowered ts maximum distance causing pawl 15 to be swung out farther than would otherwise obtain and as a result, causing its lug to pass over the. cam-rib 29, further delaying the return contact of the pawl with the notched stalf when the lever is raised, and it is not permitted by the cam-rib to contact the staff until after the pawl 16 has been withdrawn from the stafi by the upward.

movement of the lever. By this means the support of both pawls is removed and the maximum retraction of the staff will occurv at once by gravity.

Fig. 2 shows the lever and pawls in position for advancing the f staff a notch at a time. By a medium oscillation of thedever the pawls will be brought,nklternatelyt' into engagement with the notched staff and the latter moved outwardly of the standard.-

f an upwardswing of the lever furt her than is right for lifting. Such fnrther lever movement 1 upwardly, passes the lug of the pawl 16 outside of thefixed lug 31 and that pawl is held byisaidlugs. from entering the next notch in thestafi, :and so on.

Having thus fully described invention,

what I claim as new and wish to secure by Letters Patent of the United States, .is-

'1. In a lifting-j ack, .astandard, la notched stafi mounted in the standard, -a lever pivoted tov the standard, a pair of .pawls pivoted to the lever on oppositesides ofuthe, lever pivot and alternatelyengaging thenotched staff by the rocking of the, lever, means by a greater angular movement of the lever to I "alternately hold the pawls out of engage- ;amentF-With thejnext notch above to retract the stafi" comprising lugs on the side of the paw'ls and adjacent lugs on the inside of thestandard, and springs pressing the pawls i-nto engagement of the lugs with those of the standard.

2. In a lifting-jack, a standard, a notched stait mounted in thestandard, a lever pivoted to thestandard-and pawls pivoted to the lever on opposite sides of the lever pivot alternately engaging the notched staff by the, rocking of the lever, means by a greater angular movement of the lever for releasing both pawls comprising lugs on the sides of thepawls and lugs and a cam-rib on an inner adjacent Wall of the standard and other lugs on adjacent sides of the pawls adapted :to contact each other when the lever is lowered its maximum distance. i

. In witness whereof, I have hereunto set my hand and seal at Indianapolis, Indiana, this 18th day of February, A. I). one thousand nine hundred and fifteen.

/ ALBERT NEAL. [1,. s.]

Witnesses:

F. WVQWOERNER, L. B. Wonmvnn.

(fppies of this patnt may be obtained for five cents each, by addressing the Commissioner of Patents,

' 'WashingtonJlG.

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