US1410569A - Clevis jack - Google Patents

Description

D. F. HILTON.

CLEVIS JACK.

APPLICATION FILED 050.10, I920.

Patented Mar. 28, 1922.

1&10569.

L :i V u L 55 said side members 2.

FATEWT @FFQ DAVID E. Huron, or DENNISON, OHIO.

CLEVIS JACK.

Application filed December 10, 1920.

v To all whom it may concern:

Be it known that 1, DAVID F. HILTON, a citizen of the United States, residing at Dennison, in the'eounty of Tusearawas and State of Ohio, have invented certain new and useful Improvements in Clevis Jacks, of which the following is a specification.

This invention relates, to improvements in lifting jacks and has as its object to provide a jack of substantial construction capable of being readily manipulated to elevate the load and not liable to disarrangement of its parts, and in which the lifting bar will be securely supported in its elevated position so as to insure against accidental dropping of'the load.

Another object of the invention is to pro vide a novel construction of auxiliary support in connection with the lifting bar adapting the jack to be disposed beneath relatively low objects to be elevated.

In the accompanying drawings:

Figure 1 is a side elevation of a jack constructed in accordance 'with'the present in vention;

Figure 2 is a front elevation of the jack;

Figure 3 is a horizontal sectional view through'the ack taken substantially on the line 3-3 of Figure 1.

The ack embodying the invention comprises a supporting standard which is indicated in general by the numeral 1 and which comprises spaced side members 2 which stand vertically in parallel relation from a base indicated by the numeral 3. The side members 2 of the supporting standard accommodate between them a vertically slidable lifting bar indicated in general by the numeral f and this lifting bar is provided at its forward side with a longitudinally extendingforwardly projecting flange 5 having its forward edge formed with a series of rack teeth 6 which have their abrupt shoulderspresented downwardly. The flange 5 is of less thickness than the body of the lifting bar it so that longitudinal shoulders 7 are provided at the opposite sides of the said flange, and these shoulders are engaged and guided by flanges '8 which project laterally inwardly from the rela tively adjacent faces ofvthe side members 2 at the forward edges thereof. In this man ner the lifting bar is guided in its raising and lowering movement and held against displacement from its position between the In order to further Specification of Letters Patent.

Patented Mar. 2s, i922.

Serial No. Z130,388.

guide the lifting bar et and to prevent rearward displacement thereof. the said bar is formed with a longitudinally extending slot indicated by the numeral 9, and an antifriction roller 10 is rotatably mounted upon a spindle 11 which extends transversely between the side members 2 thus positioning the roller within the slot 9 so that it will be engaged by the front and rear walls of the slot for the purpose stated.

1 In order that. the lifting bar a may be moved upwardly so as to elevate the load imposed upon it, an operating lever 12 is pivotally mounted as at 13 between cars 1 provided at the upper end of the rear side of the standard 1, and a pawl, indicated in general by the numeral 15, is operatively connected wit-h the forward end of this lever and coaets with the rack teeth 6 of the lifting bar. The said pawl 15 is in the nature of a yoke comprising side members 17 and a cross piece 18, and the yoke is disposed to straddle thesta'ndard 1 and is pivotally connected at the upper ends of its sides 17 to the forward end of the lever 12 as indicated by the numeral 19, the cross piece 18 of the yoke resting in engagement with the teeth 6 of the said lifting bar. It will now be evident that by depressing the rear end of the lever 12 and consequently elevating the forward end thereof, the pawl yoke 15 will be moved upwardly and as its portion 18 is engaged with one or another of the teeth 6 of the lifting} bar, the said bar will be correspondingly elevated. Of course when the lifting bar is to be restored to its low- 'ered position it is essential that the pawl yoke 15 be rendered inactive, and for this purpose a lever 20' is pivotally mounted as at 21 upon one side of the standard 1 and is provided at its rear end with a handle portion 22 whereby it may be conveniently rocked upon its pivot, the forward end portion of the lever being flattened to provide a finger 23' riding against the lower edge of one of the side members 17 of the pawl yoke. It'will now be evident that by depressing the rear 'end of the lever 20 the forward end thereof-will be elevated to cause the finger 23 to ride upwardly against the pawl yoke and thus swing the yoke out of operative relation to the rack teeth 6 of the lifting bar 4.

In order that the lifting bar may be held in elevated position as it is moved upwardly step by step through oscillation of the lever underside of the arm 28 and at its lower end against a boss 30 formed upon the rear side of the standard 1, the spring normally holding the tooth 27 of the pawl in engagement with one or another of the teeth 2'1: of the lifting bar. Of course when it is desired to disengage the pawl from the lifting bar to permit of lowering of the latter, this may he done by depressing the lever arm 28 of the said pawl against the tension of the spring 29.

The lifting bar is provided at its upper end with a head 31 for disposal beneath the object to be elevated, and in addition to this head the lifting bar is provided with an auxiliary supporting means indicated in general by the numeral 32. The auxiliary supporting means comprises an arm 33 provided at it rear end with an car 34 as at 35 at the upper end of the forward side of the lifting bar 4. A brace 36 is pivotally connected at its upper end as at 37 to the underside of the arm 33 and extends downwardly and is guided between spaced fingers 38 formed upon the forward side of the flange 5 of the lifting bar. The lower end of the brace 36 is notched or shouldered as indicated by the numeral 39 and is adapted to be stepped into a stirrup 4:0 pivotally suspended as at l1 upon the flange 5. The tirrup 4L0 straddles the flange of the lifting bar @1 immediately below the spaced fingers 38 and when in the lowered position illustrated in Figures 1 and 2 of the drawings will serve as a firm seat for the lower end of the brace 36 so that in this position of the parts the arm 33 isrigidly and firmly supported in a horizontal outstanding position and as its upper side is located somewhat below the plane of the upper side of the head 31, it nay be engaged beneath an objectto be elevated and which would be located too low for the engagement f the head 31 therebeneath. Of course when it is not desired to use the arm 33, the stirrup 40 may be swung upwardly and forwardly so as to permit the lower portion of the brace 36 to slide past it in a downward direction and thus permit the arm to be dropped to position depending from the pivot 35.

From the foregoing description of the in vention the operation of the jack will be readil understood, and it will be evident that the same is of substantial construction and devoid of complicated parts and that either of its rest portions, namely the head 31 or arm 33 may be engagedbeneath the object to be lifted.

Having thus described the invention what is i-laiined as new is: V V

l. A lifting jack comprising a standard including spaced uprightmemberg provided with inwardly projecting flanges, a lifting har slidably disposed between said members and having longitudinal shoulders engaging and guided by the flanges, the said bar hava ing a longitudinal slot, a roller mounted between the side members of the standard and engaged by a wall of the said slot, and means for elevating'the lifting bar.

2. A lifting jack comprising a standard inchiding spaced upright members provided at their forward sides with inwardly projecting flanges, a lifting bar slidably disposed betwecu Sd-lCl H'IGITQlJBI'S and engaging at its forward edge against the said flanges and guided thereby, the said lifting bar having a rack flange projecting between the first mentioned flanges, means maintaining the lifting bar engaged with the said flanges upon the standard members, an operating lever mounted upon the standard, and a pawl operatively connected with the said lever and coacting with the rack flange of the lifting bar.

3. A lifting jack comprising a standard, a lifting bar slidably mounted thereon and having a rack at its forward edge and a-raok at its rear edge, an operating leyer mounted upon the standard, a pawl operatively con- 100 nected therewith and coacting with the first mentioned rack, and a pawl upon the stand ard coacting with the second mentioned rack. g

4:. A. lifting jack comprising a standard, 105 a lifting bar slidably mounted thereon and having a rack at its forward edge and a rack at its rear edge, an operating lever mounted upon the standard, a pawl oneratively connected therewith and coacting with the first V mentioned rack, and a pawl upon the standard coacting with the second mentioned rack,

the first mentioned pawl comprising a yoke pivotally suspended from the lever and straddling the standard and first mentioned rack and having a cross piece coacting with the teeth of said first mentioned rack.

5. A. lifting jack comprising a standard including spaced upright members, a lifting bar slidably disposed'between the members and provided at its forward side with a rack projecting beyond the members and at its rear side with a rack located between the members, an operating lever pivotally mounted between the members of the stand 12 ard, a pawl comprising a yoke including spaced sides pivotally suspended at their upper ends from said lever and straddling the standard and further including a cross piece extending between the sides and coacting with the first mentioned rack, and a pawl mounted between said members and coacting with the second mentioned rack.

6. In a lifting jack, a lifting bar having a head, and an auxiliary supporting means comprising an arm pivotally mounted upon the bar and movable to a supporting position at an elevation lower than that of the head, a brace pivoted to the said supporting arm, and means upon the said bar engageable by the lower end of the brace for supporting the same.

7. In a lifting jack, a lifting bar having a head, and an auxiliary supporting means comprising an arm pivotally mounted upon the bar and movable to a supporting position at an elevation lower than that of the head, a brace pivoted to the said supporting arm, and means upon the said'bar engageable by the lower end of the brace for supporting the same, the said means comprising a stirrup pivotally connected with the bar and arranged in lowered position to be engaged by the lower end of the brace and in upwardly swung position to permit the brace to slide downwardly therethrough.

8. In a lifting jack, a lifting bar having a head, and an auxiliary supporting means comprising an arm pivotally mounted upon the bar and movable to a supporting position at an elevation lower than that of the head. a brace pivoted to the said supporting arm, means upon the said bar engageable by the lower end of the brace for supporting the same, the said means comprising a stirrup'pivotally.connected with the bar and arranged in lowered position to be engaged by the lower end of the brace and in upwardly swung position to permit the brace to slide downwardly therethrough, and spaced means upon the bar engaging and guiding the said brace.

9. In a lifting jack, a standard, a lifting bar slidably mounted thereon and having a rack at its forward side, an operating lever mounted upon the standard in rear of the said bar, a pawl yoke pivotally suspended from the operating lever and straddling the standard and coacting with the rack, and a lever mounted upon the standard and having a portion for coaction with the said pawl yoke to swing the same to inactive position when the last mentioned lever is swung in one direction.

In testimony whereof I affix my signature.

DAVID F. HILTON. [L. s.]

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