US1883429A - Rebound check for starter pinions - Google Patents

Description

Oct. 18, 1932. D. L. WERTZ 1,383,429

REBOUND CHECK FOR STARTER PINIONS' Filed April 27, 1952 v lNl ENTbR L. LU/enf/z TTORNE Y Patented Oct. 18, 1932 L NITED STATES PATENTi OFFICE DANIEL L. wnmz, or ELMIRA, NEW YORK, AssieNon TO ECLIPSE MACHINE COMPANY,

or ELMIRA, NEW YORK, A CORPORATION or NEW YRK- REBOUND CHECK FOR STARTER PINIONS Application filed April 27,

This invention relates to a rebound check for starter pinions and more particularly to a combined anti-drift and rebound check for normally keeping a starter pinion in idle position.

In starter drives of the type in which a driving pinion is automatically traversed into and out of mesh with a gear of the engine to be started, there is sometimes a tendency for the pinion to move over and contact the engine gear when the engine is running. This may be caused by the vibration of the engine or may occur by reason of the rebounding of the pinion when thrown out of mesh as the engine starts, and in either case may cause unnecessary noise and wear of the parts.

It is an object of the present invention to provide a novel rebound check and anti-drift which is simple and economical in construction while being efiicient and reliable in operation.

It is a further object to provide such a device which is readily adaptable to existing types of starting mechanism.

Further objects and advantages will be apparent to those skilled in the art from the following description taken in connection with the accompanying drawing in which:

Fig. 1 is a side elevation of a starter drive showing a preferred embodiment of the invention;

Fig. 2 is an enlarged detail partly in section showing the rebound check in active position; and

Fig. 3 is a view similar to Fig. 2 showing the positions of the parts when the pinion is being traversed toward driving position.

Referring first to Fig. 1 of the drawing there is illustrated a power shaft 1 which may be the extended armature shaft of the starting motor, not shown. An operating member in the form of a screw shaft 2 is slidably j ournalled on the power shaft and is connected to rotate therewith by means of a yielding driving connection including a torsion spring 3 anchored at its ends to said shaft as indicated at 1 and 5 respectively.

A driving member in the form of a pinion 6 is threaded on said screw shaft in position 1932.- Serial No. 607,836.

to be traversed thereby into and out of mesh (Figs. 2 and 3) mounted to be radially slid able in a counter-weight flange 9 suitably fixed on the pinion 6 in position to bear on screw shaft 2 at the rear of an inclined shoulder 10 thereon when the pinion is in idle position. vMeans for yieldingly urging the detent 8 into engagement with the screw shaft is provided in the form ofa spring 11 bearing against the head 12 of the detent.

Means for arresting the longitudinal movement of the driving member into idle position and at the same time increasing the pressure of the detent 8 against the screw shaft in order to prevent rebounding of the pinion is illustrated in the form of a clip or lever 13 one arm l of which is located within the flange 9 of the pinion and is traversed by the detent 8,;while the opposite arm 15 extends rearwardly at an oblique angle thereto in position to be engaged by a flange 16 on the screw shaft when the pinion is in idle position, the spring 11 being arranged to bear on the arm 14 of lever 1 3-whereby when the lever is tilted by the engagement of the arm 15 with flange 16, the spring 11 will be compressed as shown in Fig. 2. I

Inoperation, rotation of the power shaft 1 is transmitted to the operating shaft 2 in the direction of the arrow, whereupon the pinion 6 by reason of its inertia will be translated to mesh with the engine gear 7, the detent 8 riding up the shoulder 10 on the screw shaft without undue resistance since the spring 11 is then exerting merely its normal moderate pressure. When the engine starts, the acceleration of the engine gear causes the pinion to overrun the screw shaft and be translated thereby back to idle position. This rearward translation may take place-with considerableviolence but the arm 15 of detent 8 is arranged to-engage the flange'16'on the screw shaft and check the rearward motion of the pinion while increasing the frictional engagement of the detent 8 with the screw shaft by reason of the tightening of the spring 11 as shown in Fig. 2. This increased pressure of the detent is arranged to prevent the pinion from bounding back toward the engine gear, but the angle of the threads on the operating shaft 2 is suficiently high so that the parts do not wedge when the pinion is thrown against the flange 16.

Although but one embodiment of the invention has been shown and described in detail itwill be understood that other embodisigned my name.

DANIEL L. WERTZ.

ments are possible and that changes may be yieldingly opposing longitudinal movement of the driving member away from idle position and means for arrestin longitudinal movement of the driving member into its idle position, said arresting means being arranged when operative to increase the effectiveness of the yielding opposing means.

2. In an engine starter drive, an operating shaft, a driving member mounted on said shaft for longitudinal movement into and out of engagement with a member of an engine to be started and for rotation therewith to crank the engine, a detent on said driving member for opposing longitudinal movement of the driving member away from idle position and means for yieldingly arresting longitudinal movement of the driving member into its idle position, said arresting means being arranged when operative. to increase the effectiveness of said detent.

3. In an engine starter drive, an operating shaft, a driving member mounted on said pressure of said detent on said shaft.

4. In an engine starter drive, an operating shaft, a driving member mounted on said shaft for longitudinal movement into and out of engagement with a member of an engine to be started and for rotation therewith to crank the engine, a spring pressed detent on said driving member adapted to frictionally engage said shaft, a stop shoulder on said shaft

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