US1197760A - Lifting-jack. - Google Patents

Description

J. F. PETHTEL.

LIFTING JACK.

APPLICATION min 050.11. 1915.

Patented Sept. 12,Y 1916.

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VJOHN' F. PETHTEL, OF BOISE, IDAHO.

LIFTING-JACK.

Specification of Letters Patent. Patented Sept, 12, 1916,

Application led December 11, 1915. Serial N o.' 66,290.

To all 'whom z5 may concern.'

Be it known that I, JOHN F. PETHTEL, a citizen of the United States, residing at Boise, in the county of Ada and State of Idaho, have invented certain new and useful Improvements in LiftingJacks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to new and useful improvements in lifting jacks and more particularly to that class adapted to be used for elevating` vehicles, such as automobiles, or the like, and designed primarily for use in garages and factories, and my object is to provide a frame structure and pivotally mount the same so that it may be swung upwardly to raise the vehicle from off the floor.

A further object is to so construct the device that all four wheels may be raised from the floor simultaneously.

A further object is to provide a lever for operating the frame and so position the lever that the weight of the vehicle may be raised with the application of a minimum amount of leverage. And a further object is to so pivot the lever that it will pass beyond the center of gravity when the frame is raised to its uppermost position and hold the frame from casually descending.

Other objects and advantages will be hereinafter set forth and more particularly pointed out in the accompanying specification.

In the accompanying drawings which are made a part of this application, Figure 1 is a fragmentary side elevation of the jack showing the same in its lowered position by full lines and in its elevated position by dotted lines. Fig. 2 is a transverse vertical sectional view thereof as seen on line 2 2 of Fig. 1 with the frame in its elevated position. Fig. 3 is an enlarged detail sectional view showing the manner of attaching the lever to the frame. Fig. d is a transverse sectional view through one of the frame supporting standards showing the anchoring base therefor, and Fig. 5 is a similar view through the lever showing the anchoring base therefor. g

Referring to the drawings in which similar reference numerals designate corresponding parts throughout the several views, 1 indicates the frame of the jack which comprises channel shape side rails 2 and connecting bars 3, said connecting bars being preferably angular shape and secured at the end s of the sidey rails. Pivotally secured at their upper ends to the side rails 2 are standards 4, the lower ends of said standards being pivotally secured in flanged sockets 5' extending upwardly from anchoring blocks 6, said anchoring blocks being in turn attached to the floor structure 7 by means of bolts 8, or inany preferred manner. One edge of each socket 5 is open so that the standards may be readily lowered to the position shown in full lines in Fig. 1 or elevated to the position shown by dotted lines in Fig. 1, the opposite end walls of the sockets limiting the swinging movement of the standards in one direction.

In order to raise or lower the frame 1, a lever 9 is pivoted at its lower end in a slot 10 of an anchoring block 11, one edge of the slot -being open and the opposite edge thereof having an inclined wall 12 against which the lever 9 rests when the frame 1 is in its elevated position, said wall being so inclined that when the lever engages the same, the Lipper end of the lever will have passed beyond the vertical line extending through its lower end thereby employing the weight of the vehicle on the frame for locking the frame inelevated position.

The lever 9 is preferably curved from end to end and the upper end thereof passes between strap members 13, said strap members being pivoted at one end between ears 14 carried by one of the cross bars 3 at the end of the frame, said strap members having friction rollers 15 between the ends thereof between which the end of the lever 9 passes and by providing the roller bearings the friction between the lever and strap members will be practically eliminated.

In order to swing the lever 9 on its pivot and raise the frame 1 to an elevated position, one edge of the leveris provided with a shank 16 with which isto be'engage'd a lifting bar 17, said bar being hollow to receive the shank and by asserting an outward pull on the lifting bar, the lever 9 will be thrown to a substantially vertical position and the frame 1 and its contents elevated, and in view of the peculiar arrangement of the lever, the frame may be moved to its uppermost position with a minimum amount of exertion on the part ofthe operator.

In operation, the anchoring blocks are secured to the iioor of the structure in such position that an automobile or similar vehicle can be positioned over the frame and after the vehicle is so positioned the lifting bar 17 is engaged with the shank 1G and an outward and downward pull given thereto which will swing the frame upwardly and lift all four wheels of the vehicle from off the floor, and in view of the fact that the lever passes beyond the center of gravity,

the weight of the vehicle will serve to lock the lever against casual rotation on its pivot and thus hold the frame in elevated position.

After the car has been repaired, an up- -ward lifting movement is imparted to the bar 17 which will result in swinging the lever 9 beyond the center of'gravity in the opposite direction when the frame l will readily descend to its lowermost position and rest the wheels of the car upon the floor from whence it may be driven or otherwise prolpelled from over the frame of the lifting Jac In view of the simplicity of this device, it can be very cheaply constructed and readily installed for use and does not require the adjustment of parts of the jack, as does the ordinary jack, for engaging the same with the axles of the vehicle, other than the one movement of the lifting bar which operates to elevate the frame into engagement with the axles of the vehicle and also for raising the vehicle from oif the floor upon which it is resting. It will likewise be seen that by attaching the operating lever to the frame through the medium of the strap members that said strap members will adjust themselves to the movement of the lever in view of their pivotal connection with the ears attached to the cross bar. It will likewise be seen that by forming the side rails, channel shaped, the highest efficiency of strength will be attained while at the same time the weight of the side rails will be reduced to a minimum. And it will likewise be seen that by mounting the lever as shown the upper end thereof will pass beyond the vertical line extending through its pivot point, when in an elevated position, whereby the weight on the frame will act on said lever to lock the frame in elevated position.

Having thus fully described, my invention what I claim as new and desire to secure by Letters Patent of the United States, is

l. A lifting jack, the combination with a frame and pivotally mounted standards carrying the frame, of a lever, an anchoring block to which said lever is pivotally attached, apair of friction. rollers carried by the frame between which one end of the lever extends, and a lifting bar adapted to be removably engaged with said lever whereby power may be applied for elevating they frame.

2. A lifting jack comprising a. frame, standards pivotally secured at their upper ends to said frame, anchoring blocks having sockets in which the lower ends of said standards are pivotally mounted, a lever, an anchoring block to which one end of the lever is pivoted, strap members pivoted to said frame, friction rollers carried by the strap members between which the free end of the lever extends, and a lifting bar for swinging said lever on its pivot to raise or lower the frame.

3. A lifting ack comprising a frame, pivotally mounted standards carrying said frame, a lever, an anchoring block to which one end of said lever is pivotally attached, a pair of strap members pivoted to said frame, friction rollers carried by said strap members between which the free end of said lever extends, a shank on the lever, and a lifting bar adapted to cooperate with said shank to swing the lever on its pivot to raise or lower the frame.

4. In a lifting jack, the combination with a frame and pivoted supporting means therefor, of a lever, an anchoring block having a slot in which one end of the lever is pivotally mounted, said slot having an inclined wall at one end, means to slidably attach the lever to the frame, and lifting bar adapted to move said lever upwardly and into engagement with said inclined wall when power is applied thereto, said lever when engaging said inclined wall resting in a plane beyond the vertical line through the pivot point of the lever.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN F. PETHTEL.

Viitnesses:

W. A. LINDsnY, EMIL ERICKSON.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

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