US466107A - Pawl-and-ratchet mechanism - Google Patents

Description

JACOB V. ROIVLETT, OF RICHMOND, INDIANA.

PAWL-AND- RATC H ET M EC HAN ISM SPECIFICATION forming part of Letters Patent No. 466,107, dated December 29, 1891.

Application filed November 4, 1891. Serial No. 410,842. (MocleL) To all whom, it may concern:

Be it known that 1, Moon V. ROWLETT, a citizen of the United States, residing at Richmond, in the county of \Vayne and State of Indiana, have invented certain new and usef ul Improvements in Pawl-and-Ratchet Mechanism; and I do hereby declare the following to be afull, 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 presentinvention has reference to that class of pawlandratchet mechanism designed for engaging a loose part Wit-h a fixed part on a shaft, the objects being to improve the general construction and to increase its eificiency in operation.

To these ends my invention consists in the construction and relative arrangement of the several parts constituting my improved pawl and-ratchet mechanism, all of which will fully appear in the following description.

Reference being had to the accompanying drawings, which form a part of this specification, Figure 1 represents in elevation my improved pawl-and-ratchet mechanism. Fig. 2 is a top view of the same. Fig. Sisa longitudinal Vertical section; and Figs. 4:, 5, and 6 are details.

The reference-letter A in the drawings denotes the shaft upon which the mechanism is mounted. Fixedly secured to this shaft in any suitable manner, but preferably by means of the key a, is the ratchet b, which is provided with three teeth I) and with a disk or face plate o integral therewith, which forms which freely encircles the shaft, and is provided with depressionsc, which conform in width to and fit over the guide cl, the central raised portion 01' entering the opening of the yoke. The pawl-teeth f are formed with the curved face f and the straight face f which latter, when. power is applied, engages the.

straight face of the ratchet-teeth and causes the rotation of the wheel. WVhen, however, the shaft revolves in the opposite direction, the teeth of the pawl ride freely over the ratchet-teeth, owing to the opening in the pawl, thereby permitting it to slide on the guide and move alternately in or out or in opposite directions. WVhen one of the teeth of the pawl reaches a tooth of the ratchet and rides thereon, the other pawl-tooth enters the space between the adjacent ratchet-teeth, and hence there is no engagement. The guide d is formed with aconcave depression (Z at each side of the portion d for the purpose of the discharging of any dirt or dust that may accumulate under the pawl and prevent its proper working.

It will be observed that by reason of the construction employed each ratchet-tooth is in one complete revolution alternately engaged by the two pawl-teeth, and consequently an engagement of the pawl is had at six points of the circumference.

By my invention I am enabled to produce a pawl-an d-ratchet mechanism of inexpensive manufacture, few and simple parts, and which is strong, durable, and not liable to get out of order.

I claim as my invention- 1. A pawl-and-ratchet mechanism comprising a ratchet fixedly secured to a shaft, a wheel loosely mounted thereon, and a pawl embracing said shaft and mounted on a guide on the pinion and adapted to slide thereon and having teeth adapted to operate in connection with the ratchet, substantially as described.

2. In pawl-and-rat-chet mechanism, the combination of a shaft having a ratchet fixed thereto, a wheel loosely mounted on said shaft and having a guide thereon, a sliding yoke stantially as described, and for the purpose to set forth.

In testimony whereof I aflix mysignature in presence of two witnesses.

JACOB V. ROXVLET'I.

shaped pawl having the depressions for said guide, and teeth on said pawl adapted to operate with the ratchet-teeth, as described.

3. In pawl-and-ratchet mechanism,the combination, with a ratchet fixed to a shaft, and with a sliding pawlfor engaging said ratchet, of a Wheel loosely mounted on the shaft and I having a guide thereon for the pawl, and concave depressions in said guide, all sub- Witnesses:

EDWIN S. ROWLETT, CHAS. (J. GEHRING.

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