US1362630A - Jack - Google Patents

Description

1. LAFRANCE. JACK.

'APPLICATION FILED FEB. 24, 1920.

1,362, 30, Patented Decf21, 1920.

In enfor" m: A Josey/2 Lafrance 6 r y M Afforney I UNITE sra'rrs PATE .rosnrn LArm'NcE, or monmm'm, QUEBEC, cannon, Ass'reiron'or ONE-HALE-TO I) omzsmn LAFRANCE, orMom'nEAL, CANADA.

' JACK.-

' To all whom it may concern:

, which exert an even Be it known that I, JOSEPH LAFRANCE, a British subject, manufacturer, St. Jerome St, in the city of Montreal, in

the Province of Quebec, in the Dominion of Canada, have invented certain new and use ful Improvements in Jacks; and I do hereby declare .that thefollowing is a full, clear, and exact description of the same.

The present invention relates to jacks particularly adaptable to automobiles and the like, and the main object of this invention is to provide a device of this characterthat will be strong, easily operated and simple and cheap of construction.

Another object is to provide a device of this character with movable cantaliver arms,

pulling on ushing action on both sides of the jack, t us ralsing evenl the lifting head.

A f urther object is to provide a device of this character which will eliminate the Tratchet and toothed racks in jacks.

- To understand the invention reference will be had to in which I Figure 1 is a side elevation of a jack according tothe invention, illustrated in" its the accompanying drawings unraised position.

-Fig. 2 is a side elevation showing the jack in it's raised pos'ition.- I

Fig. 3 is an elevation from the other side of a jack, two of the cantaliver, arms having been removed to disclose the central slot through which passes the worm.

ig. 4 is an enlarged sectional view through I one of the connecting members, in which is 2 1s ahollow member 4 which'is provided jo'urnaledthe unthreaded portion of the worm shaft.

i Fig. 5 is an enlarged sectional viewthrough the other connectingmember which is provided with a thread to engage the worm shaft. Fig.- 6 is-a side elevation of an extension handle to be applied to the worm shafts .Likeinumerals of reference indicate correiponding. parts in each figure.

p n the drawings 1 is a' base thereof an u rig t'or 0st 2 provided with aplurality 0 holes 3;

itted oversaid post Specification of Letters Patent. Application filed February 24, 1920. Serial No. 860,797. 7

residing at 10 The other ends a.

' threaded hole 19 4 It will readily be seen that when dle 21 is 1 jack. .It will be late having interniediate is operated, the hollow member 4 is 1 Patented.Dec.'21, 1920.

with a hole 5, and

6 is a pin whichis inserted through said hole 5 and through one of the holes 3 in order to adjust the height of said member 4.

Provided in the upper end of saidhollow member is a lifting-head 7 having a depending stem 8 which has at its lowermost end, a slot 9 to permit the free passage-therethrough of a worm shaft 20 that Will be described further. 7

Intermediate of the hollow member 4 is NT. F 1ca a slot 10 which corresponds to the slot 9 in the stem 8 and serves the same pu ose."

The lowermost end of the hollow mem er 4 is provided with two socket members 11, on each side thereof, and 12 are socket members provided on each side of the lifting head 7 in which are pivotally secured the cantaliver arms or links 13 by means of the pins 14.

of the links 13 are connect ng socketed means of pins 17.

The 'socketed member 15 is provided centrally with an unthreaded member 16 has a threaded hole 19. 20 is a w'ormshaft provided with a crank handle 21 at one end, and 22 is a shoulder adapted to pivotally secured to the nibmbers 15 and 16 by rest against the socketed member 15. The

said worm shaft projects through the hole 18, the slot-10 in the member 4:, the slot 9 in the stem member 8 and threads into the in the socketed-member 16. the hfln turned, the shoulder 22 will rest on theomember l5 and will carry said member inwardly, while at the same time the worm shaft 20 will engage the threadedhole 19 and pull inwardly the socketed member 16. As the members 15 and 16 are made to travel inwardlyand as the cantaliver arms or links 13 are hingedlysecured to the socketed members 11'and'12 on the hollow memhead 7 the result is that said-v ber 41, and the lihks will lift'the-head- 7, as the links are gradually brought practically into a'vertical line, thus providing a nost powerful lifting noted that before the jack adjusted on the base by means of the pin 6, which is. inserted in theholes 5 and 3.

- To lower the jack, the handle is turned in 6., the converging ends' hole 18, and the i the opposite direction and as already described, the weight on the lifting head will cause the links to regain their oblique primitive position, as the socketed members radually move away from the hollow mem er 4.

The handle 21 is removable from said worm shaft, in order to collapse the device into compact form when not in uje.

In Fig. 6 of the drawings is disclosed an extension arm 23 provided at. on] end with a brace handle 24, the otherlend oifi said aim being adapted to engage the universal joint 25 which is provided at the end of the worm' shaft 20. It will readily be understood that the extension arm 23 when used in connec-' tion with the worm shaft will enable a person to operate the jack at a distance, from under the machine. 7

What I claim as my invention is 1 A jack comprising, in combination, a vertical main member; :a vertical lifting member telescopically and slidably related thereto and havinga head at its -upper end,

said main and lifting members being provided with registering vertical slots; a pair of links pivoted at their upper ends to the posite sides of said head; a pair of links pivoted at their lower ends to the lower end of the main member at opposite sides thereof; a pair of connecting members to which the mutually-adj acent ends of the corre sponding firstand second-named links are pivoted, each connecting member having a hole formed centrally and transversely through it; a horizontal operating shaft extending through the registering slots in said main and liftmg members and journaled in other of which is. provided with a sin therewith pair of opening ings to retain said main member in adjusted .position; a pair of links pivoted at their lower ends to the lower end of the main member at o posite sides thereof; a vertical lifting mem 'r telescopically and slidably related to the upper portion of the main member and 'rovided at-its upper end with a head, said lifting and main members being 1 formed with registering vertical slots; a pair. of links pivoted at their upper ends to the opposite sides of said ead; a connecting members to. which the mutually-adjacent ends of the firstand second-named linksare pivoted; and an operating shaft extending horizontally through said registering slots and journaled in said connecting members.

Signed at Montreal, Quebec, Canada, this 9th day of February, 1920.

JOSEPH LAFRANCE. Witnesses: i Q O. PATENAUDE,

F. K. GILMOUR.

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