US1246402A - Silent pawl for phonographs. - Google Patents

Description

J. H. DO0LEY\ SlLENT PAWL FOR PHONOGRAPHS.

APPLICATION FILED MAY 21, 1911.

Patented Nov. 13, 1917.

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JAMES H. DOOLEY, OF EAST ORANGE, NEW JERSEY, ASSIGNOB TO DE CAMP AND SLOAN.

1116., A CORPORATION OF NEW JERSEY.

SILENT Ill-AWL FOR PH ONOGB-APHS.

Specification of Letters Patent.

Patented Nov. 13, 1917.

Application filed May 21,1917. Serial No. 169,864.

To all whom it may concern:

Be it known that I, JAMES H. DOOLEY, a citizen of the United States, and resident of East Orange, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Silent Pawls for Phonographs, of which the following is a specification.

This invention relates to the holding devices employed with the windin shaft of a spring motor, and is especially esigned for use with phonograph motors that are adapted to be wound up from oneend of a coil spring device while the spring is operatin to unwind at its other end to drive the instrument.

The object of the invention is to provide a device of this character that will be noise less in its winding operation by reason of member being lifted the pawl or holding and held free from the ratchet or holding means on the shaft automatically as soon as the winding shaft begins to turn; and which members will connect at once on release of the winding member and lock the shaft.

In the accompanying drawing showing one embodiment of my invention applied to a phonograph motor, Figure 1 is a side elevation of thedevice. Fig. 2 is a section on the line 2-2 of Fig. l; and Fig. 3 shows the parts of the latter view in another position.

As shown in the drawing, 4: represents the winding shaft of the motor having a suitable connection with the shaft 5 as by gears 14 and 15. It is to be understood that turning of the shaft 4 in the rotative direction indicated by the arrow in Fig. 3 serves to wind up the spring, contained in the casing 6 and by suitable means not herein set forth,

the sprlng unwinding at its other end serves 'pawl 8 mounted on a fixed pivot 9 on the frame 10, to swing to engage the ratchet wheel.

Controlling means are provided in connection with the shaft 4 and the holdin means such as the pawl 8. As represente in; the drawing I provide a helical coil sprin 12 wound around the shaft 4 with one. en 13 extended and connected with the pawl 8; while the other end is free on the shaft. By this means when the shaft 4 is turned in the direction of the arrow indicated inFig. 3 the frictional engagement of the coil spring on the shaft will cause slight turning of the spring and the extension 13 will advance to move the pawl 8 away from the ratchet wheel 7. This will take place at once and the pawl will not ride on the ratchet to make the usual noise where a pawl 'is free to engage the ratchet teeth. ,But as soon as the shaft 4 is free from the turnin movement of its handle, the spring of t e machine that has been put under tension will tend to rotate the shaft 4 in the contrary direction, as indicatedby the arrow in Fig. 2. This will cause a friction engagement with the coil spring to turn it in the same direction and pull on the extension 13, whereby the pawl 8 is drawn into engagement with the ratchet wheel, as shown in Fig. 2. This will take place at once and hence the shaft 4: is prevented from unwinding, and the pawl will be retained in this, its normal position.

The pawl 8 is also shown as provided with an arm 3 to limit the swin of the pawl away from the ratchet whee in case the spring should break, or become disarranged. The pawl normally moves vertically downward to engage the wheel so it would fall by gravity in case of non-action of the spring.

Having-thus described my invention, what 7 I claim is 1. The combination with a winding shaft, and a ratchet wheel fast thereon, of a furcated holding pawl mounted to straddle the shaft and swing to engage the ratchet wheel with one furcation to prevent unwinding movement of the shaft, and a controlling member on the periphery of the shaft having a frictional engagement only therewith and connected with the specified fur-cation of the pawl, whereby turning of the shaft in a winding direction will cause the controlling member'to swing and hold the pawl free from the ratchet wheel, while reverse Q I I 1,246,402

turning of the shaft will cause the controlengagement only with the shaft with one ling member to swing and shift the pawl end portion extended to engage the pawl against the ratchet wheel to lock the shaft. and normally hold the pawl engaging the 2. The combination with the spring motor ratchet wheel through the instrumentality 5 winding shaft of a phonograph, and a of the spring motor intendingto reverse the 15 ratchet wheel fast thereon, of a holding rotation of the shaft, the spring on turning pawl mounted to swing to engage the ratchet of the shaft in a winding direction beingwheel to prevent unwinding movement of frictionally engaged by the shaft to swing the shaft, and a helical spring secured to the and shift the pawl free of the ratchet wheel. 10 shaft by a plurality of coils foffrictional JAMES H. DOOLEY.

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