US740878A

US740878A - Jack.

Info

Publication number: US740878A
Application number: US14857303A
Authority: US
Inventors: William Robinson Lewis
Original assignee: Individual
Current assignee: Individual
Priority date: 1903-03-19
Filing date: 1903-03-19
Publication date: 1903-10-06
Anticipated expiration: 1920-10-06

Description

N0. 740,378. PATENTBD 00T. 6, 1903. W. R. LEWIS.

JACK.

'APPLIOATION FILED mn. 19, 190s.

N0 MODEL.

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UNITED STATES Patented October 6, 1903. *Y

PATENT Ormea.

JACK.

SPECIFICATION forming part of Letters Patent No. 740,878, dated October 6, 1903.

Applicant nea nach 19,1903.

To all whom it may concern:

Be it known that I, WILLIAM ROBINSON LEWIS, a citizen of the United States, and a resident of Montezuma, in the county of Poweshiek and State of Iowa, have invented a new and Improved Jack, of which the following is a full, clear, and exact description.

This invention relates to a screw-jack the leading feature of which is a novel ratchet arrangement for operating the jack, which may engage the jack-screw in any position and be applied to or removed from the screw at will. Various other minor features are present, as will be fully pointed out hereinafter.

This specification is an exact description of one example of my invention, while the claims deiine the actual scope thereof.

Reference is to be had to the accompanying drawings, forming a part of this specication, in which similar characters'of reference indi cate corresponding parts in all the views.

Figure l is a perspective view of the in vention. Fig. 2 is a vertical section thereof. Fig. 3 is a fragmentary view of the wrench or handle. Fig. 4 is a section on the line 4 tof Fig. 2; and Fig. 5 is a detail view of the pawl, partly broken away and in section.

a indicates the base of the jack, which is formed of metal cast around the lower portion of a tubular shank h, the latter being formed of gas-pipe orother tubing, thus providing the body of the jack in one practically integral structure, which structure affords a maximum degree of strength at a minimum cost and weight. In the upper end of the tubular shank is placed a nut c, which has a reduced portion c tted in the shank b and held removably by means of a screw c2. The advantage of this is that should the nut become injured it may be readily removed and a second nut placed in the jack without disturbing the other parts.

d indicates the screw of the jack, which is threaded in the nut and provided at its upper end with a head e, arranged to turn on the screw and held against axial movement by means of a threaded pin e', which is screwed in the head and works in an annular groove d in the upper end of the screw.

Fastcned to or formed integral with the Serial No. 148,5 73. (No model.)

screw, just below the head e, is a ratchet f, and with this ratchet works the improved handle. This handle comprises a bar g, preferably tubular, with solid plug Welded in the iiattened inner end g', as shown best in Fig. 4. Two hooks h are provided, said hooks having Shanks between which is sandwiched the Iiattened end g of the bar g. Said parts g and 7i are fastened securely together by rivets h', as shown. Between the hooks his located a dog or pawl c', one end of which projects inward to engage the teeth of theratchet f and the other end of which projects outward to form a finger-piece, by thefmanual operation of which the pawl may be moved out of active position.

t" indicates a spring, which may be of any desired form and which is employed to actuate the pawl, this spring holding the pawl in normal or active position and yielding to permit it to recover its hold on the ratchet, all of which will be understoodfrom the prior art.

h2 indicates a pin which is extended between the hooks h and located at the bills thereof, this pin serving to strengthen the parts and preventing relative lateral displacement of the hooks and also limiting the movement of the pawl.

In vthe use of the invention the hooks h are made to embrace the screw, one above and one below the ratchet f, so that the dog or pawl t will then engage the ratchet-teeth. By rocking the bar g to the left (see Fig. 4) the pawl v1 moves outwardly over the ratchet,

and then by moving the bar in the opposite Y direction the pawl takes hold on the ratchet,

and the screw d is then operated. It will be seen that great power may be obtained by this device and that the operating device or handle may be wholly disconnected from .the screw whenever desired. This provides a jack which may be readily handled and which may be storedrin a relatively small space. Numerous other advantages will be apparent to persons skilled in the art.

Various changes in the form, proportions, and vminor details of my invention may be resorted to at will without departing from the spirit and scope thereof. Hence I consider myself entitled to all such variations as may lie within the intent of my claims. l

IOC

/ Y v I Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination with a jack comprising a base and. a screw working therein, of a ratchet attached to the screw, an operating device comprising a bar, a hook thereon capable of removably embracing the screw, and a pawl mounted on the operating device adjacent to the hook and capable of engaging the ratchet.

2. The combination with a jack comprising a base and a screw working therein, of a ratchet attached to the screw, an operating device comprising a bar, a hook thereon capable of removably engaging the screw, and a pawl mounted on the operating device adjacent to the hook and capable of engaging the ratchet, the said pawl comprising an arm engaging the ratchet and a second arm projecting outward to facilitate the manual adjustment of the pawl.

3. The combination with ajack, comprising a base or body and a screw therein, of a ratchet attached to the screw, and an operating device comprising a bar or handle, two hooks attached thereto and spaced from each other, said hooks being capable of removably embracing the screw with the ratchet between them, and a pawl fastened to the operating device adjacent to the hooks and arranged to engage the ratchet.

4. The combination with a jack, comprising a base or body and a screw therein, of a ratchet attached to the screw, an operating device comprising a bar or handle, two hooks attached thereto and spaced from eachother, said hooks being capable of removably em' bracing the screw with the ratchet between them, and a pawl fastened to the operating de vice adjacent to the hooks and arranged to engage the ratchet, the said pawl comprising two arms, one of which acts with the ratchet and the other oneof which projects outward from the operating device to facilitate the manual adjustment of the pawl.

5. An operating device for screw-jacks, comprising a bar or handle, two hooks attached thereto and spaced from each other, and a pawl pivotally mounted between the hooks.

6. An operating device for screw-jacks, comprising a bar or handle, two hooks attached thereto and spaced from each other, and a pawl pivotally mounted between the hooks, said pawl having two arms, one of which is adapted to work with a coacting ratchet, and the other of which projects outward in position to facilitate the manual adjustment of the pawl.

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

WILLIAM ROBINSON LEWIS.

Witnesses:

S. E. SMITH, JNO. HALL, Jr.