US252962A - Ratchet-and-pawl device - Google Patents

Description

(No Model.)

J. s. OBRIEN. RATUHET AND PAWL DEVICE.

No. 252,962. I Patented Jan. 31,1882.

NITED STATES PATENT Farce.

JOSEPH s. OBRIEN, OF PRINGFIELD, MASSACHUSETTS.

RATCH ET-AND-PAWL DEVICE.

SPECIFICATION forming part of Letters Patent No. 252,962, dated January 31, 1882.

Application filed December 8, 1881.

To all whom it may concern Be it known that I, JOSEPH S. OBRIEN, a citizen of the United States, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented new'and useful Improvements in Ratchet-and-Pawl Devices, of which the following is a specification.

The invention relates to improved ratchetand-pawl devices for mowing-machines and other uses, the object being to provide such devices which are strong and positive in their operation, but above all perfectly noiseless, so that when the motion of said niachinesis reversed the usual ratchet noise made by them will be obviated.

In the drawings forming part of this specification, Figure 1 illustrates one endof a mowing-machine drum having applied thereto ratchet-and-pawl devices constructed according to my invention. Fig. 2 is a view of the pawl disk or plate. Fig. 3 is a view of one of the pawls, and Fig. 4 is asegment of the ratchet-ring.

In the drawings, A is the drum. B is the ratchet-ring. c c are the pawls. d is a shaft. 0 0 are pins placed in acollar, i, on said shaft, or directly therein, and standing at right angles to its axial line; and h is a grooved pawldisk.

The shaft (1 is' fixed in the drum A and adapted to turn with it, and has fixed therein, in a collar, i, thereon, two pawl-pins,oo,standing at right angles to said shaft and upon opposite sides thereof.

The pawl-disk h is bored to slip over co'lar i on shaft (1, and has two grooves, x 00, formed in one side thereof to receive the pawl-bars c c, the latter being notched to receive pins 0 0. The ratchet-ring B in this application of the ratchet-and-pawl devices has a gear formed on its periphery, to provide means for direct connection between drum A and the cutter-bar shaft of a lawn-mowing machine, and said (No model.)

ratchet-ring is by any well-known construction of such wheels made with arms ora solid be driven in opposite directions, and each will carry one of the pawls 0 toward the periphery of disk h, causing the outer beveled ends of said pawls to engage with the teeth of the ratchet-ring B and revolve the latter by the rotation of said drum; but when the motion of the latter is reversed the said pawls are drawn back away from ring B and clear from it, and disk It and said pawls revolve noise lessly within said ring.

It will be seen by the above description of said ratchet-and-pawl devices that the movement of the pawls both toward and from the ratchet-ring is positive, no springs being relied upon, and that they will surely act regardless of the position of the parts.

The within-described application of said ratchet-and-pawl devices is only one out of many to which it may with advantage be adapted.

WVhat I claim as my invention is- The within-describedimproved ratchet-andpawl device, consisting of the shaft 01, having the pns o o therein, the pawls c c, notched to receive said pins, the disk 71, grooved to receive said pawls in the face thereof, and the ratchet-ring B, all combined and operating substantially as set forth.

- JOSEPH S. OBRIEN.

Witnesses H. A. UHAPlN, H. E. WILKINS.

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