US1570639A - Lifting jack for automobiles - Google Patents

Description

- A. J. PERlmsvErAu LIFTING JNGK EUR AUTOMOBILES Filed muguet 5," zsm QW A .www /w r Uw@ SAM Wh.

Patented Jan. '26,' 1926.

r:UN1TE| A sffrm's @piacer ANDREWJ. PERKINS ANI) LESTER ISERKINs, OE CHICAGO, ILLINOIS, AssIGNORs To YELLOW JACK-I'IMANUEAOTURING CO., OE CHICAGO, ILLINOIS, A CORPORATION F ILLINOIS.

LIFTING JACK FOR AUTOMOBILES.

Application filed August 5, 1921. Serial No. 489,991:

To a-ZZ whom it' may concern Be it known that we, ANDREW J. PERKINS and LESTER PERKINs, citizens of the United States, and residents, respectively, of Chicago, in the county of Cook and State of Illinois, and of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvement-s in Lifting Jacks for Automobiles, of which the following is a full, clear, and exact specification.

l Our invention relates to lifting jacks, and more particularly to portable jacks for use in connection with automobiles or other heavy vehicles.

-One of the objects of the invention is to provide a portable jack so constructed that the same can be quickly adjusted to the proper height of the axle.

A further object is to provide an easily manipulated foot lever mechanism -within easy reach of thek operator for adjusting the extensible member.

These and other objects are obtained by providing a novel construction, the features of Vwhich are hereinafter more fully described and claimed.

In the accompanying drawings which` illustrate the preferred embodiment of our inventioni 'f Fig. 1 is a side elevational view of a lifting jack embodying our invention.

Fig. 2 is a rear elevational viewof Fig. 1. Fig. 3 is across sectional view taken onthe lines 3-3 in Fig. 2, looking in the'direction of the arrows.

Fig. 4 is a detailed sectional top View of our lifting ack. p As illustrated inthe drawings, our improved lifting jack comprises a. longitudinal frame member 10 preferably constructed of steel plates 11, which are secured together by a series of bolts 12, sleeves 13 being carried by these bolts, and spacing the plates 11 apart. The rear ends of the plates 11 have secured to their outer surfaces, brackets 14, which are angular in section. The horizontal portions of these brackets carry U-shape securing members 15, in which is mounted an axle 16, which carries at its outer ends truck wheels 17, Cotter pins 18 being provided between the truck wheels and outer ends of the axle for the purpose of securing the wheels in place. The forward end of the truck is carriedV by the castor wheel 19 mounted inthe bracket 20 which is pivotally secured to the main frame 10.

The actuating mechanism for effecting the lifting of rthe jack proper comprises the usualy hand operating lever 21 pivoted-at 22.

to the forward end of the main frame 10 between the longitudinal side plates 11. Pivotally mounted on the pivot 22' with the lever 21 is a drum 23 for the purpose hereinafter more fully described. The drum 23 has formed integrally therewith a ratchet wheel 24 adapted to be engaged by a locking pawl v25 pivoted to the framev 10. The lever 21 has pivo-tally mounted adjacent its lower end, a normally spring pressed pawl 26 adapted to engage the ratchet wheel 24 in the normal manipulation of the hand lever 21 in the raisingor lowering of the jack. Securely fixed to one side of the winding drum 23 is a flexible chain 27 which extends rearwardly for the purpose hereinafter set forth. For a more vdetailed description of the above described mechanism see our U. S. Patent No. `1,322,941 dated November 25, 1919.

The vconstructionembodying our new invention comprises a main square hollow standard kor lifting member 28 positioned between the side plates 11 and held from displacementby the guiding plates 29 secured is an extensible member 30 provided .with a.

laterally extended lug 31 adapted to be engaged by a lever 32'pivoted to the side of the main frame 10.1 The lug 31 is provided with an enlarged square headed portion on its outer end-thereof which forms a guard or guide for preventing the lever 32 from slippiiiglaterally off the lug 31 when the extensible member 30 isfbeing raised by the lever. It will be noted that a U-shaped notch.10 is provided in the frame member 10A adjacent the lifting member 30. This notch 10 isadaptedto receive thelug 31 and thus sustain the weight of the extensible member 30 directly on the frame member and also to permit the lug 3l to be engaged by the lever 32 when the extensible member 30 is in its lowermost position. The forward end of the lever 32 is provided with a right angularly bent portion 34 adapted to be operated by the foot of the operator when the shown in the dotted lines in Figure 1. It will be further noted that the rearward end of the lever 32 is notched at 35i in a manner to rest on the head of the bolt 12 when said lever is in its lower position. rl`he extensible member 31 is provided with a series of vertically disposed teeth 36 adapted to receive a gravity pawl member 37 as shown in Fig. 3. The usual axle supporting bracket 31 is pivotally positioned in the upper end of the extensible member 30. The pawl member 37 is provided with a normally vertically disposed shank 38 having spaced apertures 39 adapted to loosely receive bolts 40. The bolts 40 are held in position by an angular-ly bent member 41 spaced from the rear side of the tubular member 28 by a spacer 42. The angularly bent member 41 and spacer 42 are secured to the tubular member 28 by the bolts 43. The hollow member 28 is provided with a notch portion 44 through which the tooth engaging portion of the gravity pawl 37 extends to engage the teeth 36. It will be noted in the position shown in Fig. 3, that the tooth engaging portion 45 rests upon the base of the notch 44 of the tubular member 28 when the gravity pawl 37 sustains or supports the extensible member 30. It will be further noted that the gravity pawl 37 is normally held pressed against the teeth 36 by a weighted member 46 formed integrally on the forwardly extended portion of the gravity pawl 37.

The tubular member 28 is lifted between the guiding plates 29 by means of a flexible chain element 47 connected to a forwardly extending link 48 fixed to the lower end of the tubular member 28. The flexible element 47 is guided in its movements over a roller 49 journaled on one of the bolts 12 carried by the side plates 11. The flexible member 47 is connected to the flexible chain 27 through a horizontal connecting link 50.

The operation of the above described mechanism is as follows:

Assuming that an automobile is to be lifted, the jack is wheeled to the front or rear of the machine as the case may be, and the extensible member 30 is positioned beneath the axle. The operator then, depresses the angularly bent portion 34 of the lever 32 which lifts the extensible member 30 by means of the lever engaging the lug 31. This extensible member is thus elevated until it comes in Contact with the axle, as shown in the dotted lines in Fig. 1. Afterv the extensible member 30 has been elevated to the desired position by the lever 32, the lever returns to its normal position shown in the full lines in Fig. 1. The lifting is done by the movement of the lever 21 about its pivot 22, the pawl 26 engaging the ratchet wheel 24 and rotating this ratchet wheel, thereby rotating the drum 23 carrying with it the fiexible chain 27 in the manner to elevate the hollow member 28 through the connections and 47 to the base of said hollow member. l/Vhen the operator desires to lower the extensible member 30 with respect to the hollow member 28, he disengages the gravity pawl 37 from the teeth 36 of the extensible member 30 by lifting the weight 46 upwardly and thus swinging the gravity pawl 37 rearwardly about its shank 38, per init-ting the extensible member 30 to drop to its lowermost position. By this construction it will be seen thata very simple, efficient and durable device has been provided and one which can be easily operated.

While we have described in the above specification one embodiment which our inventio-n may assume in practice, it should be understood that the invention is capable of modification, and that modification may be employed without departing from the spirit and scope of the invention as expressed in the following claims.

Ve claim:

1. In a lifting jack a longitudinal frame, a lifting member mounted in said frame, an extensible member mounted in said lifting member, means including a pawl having a vertically extending shank, said pawl being pivoted on the lower edge of said shank on said lifting member for locking said extensible member in adjusted positions, and means extending through said shank and secured to said lifting member for guiding said pawl in its movement.

2. In a lifting jack, a longitudinal frame, a lifting member adjustably mounted in said frame, an extensible member adjustably mounted within said lifting member and a pawl pivoted to said lifting member adapted to slidably engage the upper end of said lifting member for adjustably supporting said extensible member. Y

In testimony whereof we aflix our signatures.

ANDREIV J. PERKINS. LESTER PERKINS.

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