US1486179A - Lifting jack - Google Patents

Description

March 11, 1924. 1,486,179

T. J. BIRD LIFTING JACK File May 15 1922 Patented ill, 1224..

warren stares THDEEAS JAIEES BIRD, 0F SEATTLE, WASHINGTON.

MFTING AGE.

Application filed M94715,

To all whom it may concern:

Be it known that THOMAS J. Brno, citizen of Canada, residing at Seattle, in the county of King and State of Washington, has invented certain new and useful Improvements in Lifting Jacks, of which the following is a specification.

lhis invention relates to lifting jacks, and has for its object the provision of a screw-jack of the floor-type of novel form and construction which will be operative to perform the functions of a jack for automobile, house moving, railway track-work, and for other uses, in a particularly direct, expeditious and eliective manner.

A further object of the invention is to provide actuating mechanism of simple and advantageous arrangement and design whereby the actuating force applied to the appa' ratus is utilized in increased power without unduly decreasing the speedy performance of its work.

A still further object of the invention is the provision of novel. supporting devices in which the objects to be lifted are engaged whereby the ack can be readily and quickly fitted in operative position with a minimum of labor and time expended.

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the present invention appertains.

With the above and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts, and in the details of construction hereinafter described and claimed, it being understood that, within the scope of what is claimed, changes in the precise embodiment of the invention shown can be made without departing from the spirit of the invention.

In the accompanying drawings Fig. 1 is a view in side elevation of a jack embodying my invention. 1

Fig. 2 is a plan view of the same partly broken away to disclose the interior mechanism thereof.

Fig. 3 is a view principally in vertical section of the same.

Referring to said views, the reference numeral 5 indicates a cast-metal base of substantial construction of generally cylindrical configuration and formed with an extended annular ledge 6 about its lower perimeter which may be extended upon one side in a 1922. den-tail H0. 581,65d.

lip as at 7. A cylindrical casing 8 integral I with said base is arranged concentrically thereon and formed with an interior chamber 10 leaving a circular opening 11 in its bottom in the vertical axis of the chamber and said base extending through to a recess 12 on the underside of the base.

The bottom surface 13 of said chamber is suitably formed to provide a bearing for a circular roller-bearing composed of a plurality of tapered rollers 15 each having rounded ends 16. 17 indicates a gear-Wheel formed with gear-teeth 18 on its peripheral edge and having upper and lower surfaces 20 and 21, respectively, of suitable configuration to conform to rollers, such as. 15. A vertically arranged cylindrical post 22 extends in a reduced shank 23 through a central aperture in said gear-wheel 17 wherein a key 25 connects them to rotate in unison. Said post is provided with a shoulder 26 supported on the upper side of the wheel 17 and extends thereabove and above the casing where it is formed with screw-threads, as indicated at 27. Rollers 28 are superposed upon the gear-wheel 17 in substantially the same manner as indicated with reference to 'the rollers 15 and a cover-plate 30 is proand 36 are respectively disposed which sup port a crown gear-wheel 37 on a bearing: pin 38. Said gear-wheel 37 has gear-teeth 40 on its peripheral edge which are in mesh with the teeth 18 of gear-wheel 17 and inclined teeth 41 on its crowned edge in mesh with a driving bevel-pinion 42 mounted upon mandrel &3 supported in a yoke 4A secured to said brackets 35 and 36. An operating shaft 45 is connected to said mandrel by a universal joint 4:6 and may be manually actuated by a crank-handle 47 while the operator may support said shaft by a loosely mounted spool 48 that may be grasped by one hand.

A lifter-member cooperating with the above described devices is composed of a substantially cylindrical body 50 having an axially arranged screw-threaded bore 51 adaptable to receive the screw 27. A saddie 52 at the to of the litter is arranged to receive an ax e or any object that is to he lifted, Adjacent the bottom of the body said lifter is formed with an arm 53 extending atsubstantially right angles thereto swingable, dependent leg 57 formed with a terminal hook 58 in which an object to be lifted which is at a level too low to be reached by either of the other similar devices 52 or 55 maybe received. Also said leg may be swung outwardly to get under an object that otherwise would be difiicult to reach with a jack.

The operation of my improved jack will hereadily understood from the foregoing description taken in connection with the accompanying drawings. With the lifter in its lower-most position, as indicated in Fig. 1, the jack is placed. under the object to be lifted or slidably moved thereunder through pushing the jack by means of the shaft 45. The ack is placed thereunder in such position that either of the supporting elements 52, 55 or 58 will receive the said object. The shaft is then actuated causing the bevel-pinion 42 to actuate the gearwheel 17 through intermediate gear 37 and thereby rotate the post 22 which throiwh reaction ofits screw-threads 27 with tie opposing screw-bore 51 of the lifter-body transferre through the post 22 to the gear-- 1 earts wheel through said circular shoulder 26 and is thence borne upon 'therollers 15 there below which take up said-load evenly and distribute the same throughout the base. In the event that a load is to be borne upon the oil-center portion of the jack, such as the depression or hook 58, any tensional tendency will be transmitted throughout the anti-frictional elements 15 below and 28 above the gear-wheel 17 in such manner to more equally distribute the strain and to insure the continuance of a smooth-running transmission of the power and an efficient reduction of friction.

While I have shown my invention through choice as being actuated by gears I do not wish to be confined to such construction as the 1nvent1on= may undergo certain changes and modifications to suit particular purposes such as the substitution of a rack and to said shaft. within the chamber and having inclined upper and lower surfaces, and roller bearings arranged between the upper and lower surfaces of the gear and the top and bottom of the chamber respectively, said roller bearings occupying the full space within the chamber in both directions beyond the gear, and means carried by the jack and arranged beyond the chamber for driving cooperation with said gear.

In testimony whereof I aflix my signature.

THOMAS JAWS BIRD.

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