US1309973A - Planooraph co - Google Patents

Description

C. S. WRIGHT.

JACK.

APPLICATION FILED OCT-19:19l8. 1,309,97 3.

Patented July 15, 1919.

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C. S. WRIGHT.

JACK.

APPLICATION FILED OCT-19,19H].

.1 ,309,973. Patented July 15, 1919.

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CLYDE S. WRIGHT, OF TOLEDO, OHIO, ASSIGNOR TO THE NATIONAL SUPPLY COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO.

JACK.

Specification of Letters Patent.

Patented July 15, 1919.

To all whom it may concern:

Be it known that I, CLYDE S. WRIGHT, a citizen of the United States, residing at Toledo, in the county of Lucas and State of Ohio, have invented new and useful Improvements in Jacks, of which the following is a specification.

My invention relates to jacks and more particularly to that type thereof known as the Barrett type of jacks, as exemplified in Barretts Patent No. 527,102, granted ()0- tober 9, 1894:.

It is the principal object of the present invention to reduce the number of parts employed in the jack of the said patent and to otherwise simplify the same and reduce the cost thereof.

The accompanying drawings, Figures 1 to 5, inclusive show a side elevation of my invention with the cover-plate removed and with the ends of the operating handle and the rack broken off, the several views showing the operating parts in the successive positions they assume in the operation of the jack.

On the drawings 1 is a carriage adapted to travel on the rack 2 by the reciprocation of the operating lever 3 having fulcrum or bearing pins journaled in the carriage, only one bearing 4 being shown.

The lever 3 carries within the carriage two pawls 5 and 6 arranged on opposite sides of the pin 4 so that, as the lever is reciprocated, one pawl will move forwardly and the other backwardly. The pawls are adapted to engage with the teeth on the top of the rack and, when not prevented from free operation by the links 7 and 8, will cause the carriage to travel in the direction of the arrow D against a force applied against the carriage and in the direction of the arrow B, as will be readily understood.

Within the rear portion of the carriage I place the reversing lever 9 which is pivoted between its ends on the pin or pivot 10, the lower end of this lever being just in front of the opening 11 in the lower part of the rear end of the carriage and its upper end lying preferably somewhat above the level of the pin 4. 12 is a trip lever pivoted on the pivot 13 and arranged so that its lower end may be swung up through the opening 11 and in contact with the rear face of the lower end of the reversing lever 9 so as to move the latter from the position shown on Fig. 1 to that shown on the other figures, and lock the same in the latter po sition, in a manner well known in the art. The upper end of the lever 9 is provided with the center pin 14:, around which is coiled the center of the spring 15 having the upper and lower members 16 and 17 pivotally connected to the respective links 7 and 8. These links have the slots 18 and 19 by means of which there exists some lost motion between the links and the pawls connected together by the headed pivots or pins 20 and 21 passed through the respective slots 18 and 19 and entering the pawls 5 and 6, respectively.

22 is a stop-lug on the lever 9 at the rear of the spring member 17 for limiting the rearward movement of the said member. The rearward movement of the spring member 16 is limited by the stop-lug 23 on the carriage.

On Figs. 2 to 5, as on Fig. 1, the arrows R indicate the place and direction of the resistance to the jack, and the arrows D the direction of movement of the jack.

Assuming that there is a left-hand pressure against the carriage as indicated by the arrow B and that the parts of the jack are as shown on Fig. 1, the carriage may be moved toward the left as follows: The lever 12 is swung from the upright position shown on Fig. 1 to the horizontal position shown on Fig. 2, whereby the lever 9 becomes locked with its upper end in its rear position and the links 7 and 8 are moved to the left so that the pivots 20 and 21 lie in the right-hand ends of the slots 18 and 19, and cause the spring members to be put under tension tending to draw the links to the left and the pawls out of engagement with the rack 2, the pressure to the left on the carriage, however, holding the pawls firmly in the teeth of the rack.

The parts being now as shown on Fig. 2, the lever 3 is moved slightly to the left which causes the pawl 6 to move the carriage slightly to the right and the pawl 5 slightly in the same direction, which releases the pawl 5 from the rack. The spring member 16, being under strain, at once draws this pawl up above the rack. The lever 3 is then moved to the right which allows the carriage to move to the left. At the same time the lever 3 moves the pawl 5 to the left. The

pawl 5 owing to the movements of the carriage and the lever 3 rides to the left above the top of the tooth from which it was just released. The position of the parts at the moment of the release of the pawl 5' is shown on Fig. 3, where the lug 24: on the lever 3 engages the top of the pawl 5 and revents its engagement with the pawl 6. spring members 16 and 17 are both in engagement with their stops and the pivot 20 rides to the left in the slot 18, which allows the pawl 5 to drop in front of and engage the next tooth on the rack, as shown on, Fig. 4. During the movement of the carriage to the left by the right-hand movement of the lever 3 the pawl 5 was traveling to the left with the carriage and the lower end of the lever 3. As the carriage moves tothe left the pawl 6 being stationary, the member 17 of the spring 15 is placed under tension since the pivot 21 is at the right end of the slot 19, thereby holding the lower end of the member 17 at a fixed position.

By moving the lever 3 in Fig, 4; slightly to the right, the pawl 5 moves the carriage slightly to the right which releases the pawl 6 from the rack, whereupon the springmember 17 draws the pawl 6 above the rack as shown on Fig. 5. The handle is then moved to the left which allows the carriage to move to the left and causes the pawl 6 to pass above the tooth from which it was just released. As the carriage travels to .the left the spring-member 17 soon engages its stop 22, and the pawl 6 then moves down into engagement with the next tooth on the rack, when the parts are again as they were in Fig. 2 with the spring-member 16 under tension, ready to lift the pawl 5 when released as hereinbefore described.

I claim-- 1. In a jack, a rack, a carriage adapted to travel thereon, an operating lever mounted on the carriage, two pawls carried by the lever on opposite sides of its fulcrum, a onepart reversing lever carried by the carriage, means for looking it in a stationary position, a spring mounted directly on the reversing lever and having two spring-members, and links connecting the spring members respectively to the pawls, there being a lost motion connection between the spring-members and the pawls to put one or the other of said spring-members under tension when the carriage is moved backWardly and to move the oon the pawl away from the rack when released therefrom.

2. In a jack, a rack, a carriage adapted to travel thereon, an'operating lever mounted on the carriage, two pawls carried by the lever on opposite sides of its fulcrum, an integral reversing lever carried by the carriage, means for looking it in a stationary position, a spring mounted directly on the reversing lever and having two spring-members, and links connecting the spring mem bers respectively to the pawls, there being a lost motion connection between the springmembers and the pawls to put one or the other of said spring-members under tension When the carriage is moved backwardly and to move the pawl away from the rack when released therefrom.

31 In a jack, a rack, a carriage adapted to travel thereon, an operating lever mounted on the carriage, two pawls carried by the lever on opposite sides of its fulcrum, an integral reversing lever carried by the carriage and having a pin thereon, means for locking it in a stationary position, a spring mounted on the said pin and having two spring-members, and links connecting the spring-members respectively to the pawls, there being a. lost motion connection between the spring-members and the pawls to put one or the other of said spring-members under tension when the carriage is moved backwardly and to move the pawl away from the rack when released therefrom.

4. In a jack, a rack, a carriage adapted to travel thereon, an operating lever mounted on the carriage, two pawls carried by the lever on opposite sides of its fulcrum, an-in tegral reversing lever carried by the carriage, means for locking it in a stationary position, a spring mounted directly on the reversing lever and having two spring-members, links connecting the spring-members respectively to the pawls, there being a lost motion connection between the spring-members and the pawls to put one or the other of said spring-members under tension when the October, 1918.

CLYDE S. WRIGHT.

copies of this patent may be obtained for five cents each, by addressing the commissioner of Batents, Washington, D. G.

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