US1203673A - Lifting-jack. - Google Patents

Description

' T. H. WITTLIFF & C. W. PARKER.

LIFTING JACK.

APPLICATION FILED 00122. 1914.

Patented Nov. 7; 1916.

SATS PA THORDORE H. WITTLIFF AND CHARLES W. PARKER, 0F DAYTON, OHIO, ASSIGNORS, BY

nn ion DIRECT AND MESNE ASSIGNMENTS, TO FANNIE IVL WITTLIFF, 0F WAGO TEXAS.

H LIFTING-JACK.

Specification of Letters Patent.

Application filed October 22, 1914. Serial No. 867,936.

To all whom z't may concern Be it known that we, THoRDoRn H. WITT- LIrr and CHARLES W. PARKER, citizens of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Lifting-Jacks; and We do 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, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in lifting jacks of a type especially adapted to be used in connection with automobiles.

The jack of the present invention is of the screw type and the object of the invention is to provide a sirnplified form of jack which is of the requisite strength, eflicient in operation and comprises a minimum number of parts, as hereinafter more particularly described.

Referring to the accompanying drawings, Figure 1 is a side elevation of the improved jack with part of the standard broken away; Fig. 2 is a section on the line a-a of 1; Fig. 3 is a section on the line b-b of Fig. 1; Fig. 4 is a section on the line bb of Fig. 1 with the parts in a different position from that shown in Fig. 3; and Fig. 5 is a perspective view of the pawl lever for operating the jack.

In the specification and drawings, similar reference characters indicate corresponding parts.

Referring more particularly to the drawings, 1 represents a base from which up wardly extends a hollow standard 2. The standard 2 is suitably braced to the base 1 by webs 3. Mounted and adapted to reciprocate within the hollow standard 2 is a screw 4 having a cap 5 adapted to engage the object tobe elevated. The screw 4 and cap 5 are elevated by means of a ratchet nut 6 which surrounds the screw 4 and rests upon the upper end of the standard 2. By rotating the ratchet nut 6 the screw 4 is elevated and lowered. The ratchet nut 6 is rotated by the pawl end 7 of a lever 8 and said pawl end 7 is held in alinement with the ratchet nut 6 by a socket 9 provided with loops 10 which surround the hub ll of the ratchet nut 6. The socket 9 rotates freely around the ratchet nut 6. The pawl end 7 of the lever 8 is suitably chamfered to permit the pawl end 7 to engage the teeth of the ratchet nut 6 when the pawl end 7 is moved in one directionbut to ride over the ratchet teeth when the pawl end 7 is moved in the opposite direction. The direction in which the nut 6 is rotated and, consequently, the direction in which the screw 4 and cap 5 move depends upon the position in which the pawl end 7is inserted in the socket 9. In Fig. 3, the pawl end 7 is inserted in the socket in a position to move the screw 4 up when the lever 8 is oscillated, while in Fig. 4, the pawl end 7 is reversed to rotate the ratchet nut 6 in a reverse direction to move the screw 4 down. The end of the lever 8 is provided with suitable indications Up and Down to indicate to the operator in which position he should place the pawl end of said lever to move the screw 4. The screw 4 is prevented from rotation during the rotation of the nut 6 by a transverse pin 12 mounted in the lower end of the screw 4. The ends of the pin 12 ride in grooves 13 along the inside of the standard 2. The said pin 12 is inserted in the screw 4 through an opening 14 at the top of one of the grooves 13.

The jack is actuated by oscillating the lever 8 meanwhile exerting a slight inward pressure upon the lever 8 to insure the pawl end 7 engaging the teeth of the ratchet nut 6.

Having described our invention, we claim.

1. A lifting jack comprising a hollow standard having internal grooves in opposite walls, the standard being provided with an opening which intersects one of said grooves, a lifting bar movable in the standard, and a pin extending transversely of the lifting bar and operating at its ends in said grooves, said pin being adapted to pass through the opening of the standard and to be held against movement on the lifting bar by the bottom walls of the grooves.

2. A lifting jack comprising a standard, a lifting bar movable in the standard and having a screw formed thereon, a ratchet nut engaging said screw, a member mount- In testimony whereof We affix our signaed to turn relatively to the nut and having tures, in presence of two Witnesses.

a non-circular socket, and a lever having a THORDORE 'H. VVITTLIFF. beveled end and a non-circu1ar portion to CHARLES W. PARKER.

fit in said socket so that the beveled end will Witnesses:

engage the ratchet nut in either of tWo posi- NELLIE GALLOWAY,

tions. MATTHEW SEIBLER.

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

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