US1870075A

US1870075A - Starting motor

Info

Publication number: US1870075A
Application number: US519111A
Authority: US
Inventors: Josiah H Sutter
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-02-28
Filing date: 1931-02-28
Publication date: 1932-08-02
Anticipated expiration: 1949-08-02

Description

Aug-'2, 1932- J. H. SUTTER 1,870,075

STARTING MOTOR Filed Feb. 23. 1931 INVENTOR. JOSIAH h. Surnzz' A TTORNE Y.

Patented Aug. 2, 1932 s ren STATES JOSIAH H. SUTTER, F WIGHITA, KANSAS STARTING 2 MOTOR Application filed February 28,1931. f Serial No, 519,111.

This invention relates to starting motors for machinery but it is especially designed for use in connection with a starting motor for vehicles, in which the pinion on the drive 3 shaft is held in mesh with the gear on the fly wheel of the motor until such time as the fly wheel starts to over-run the pinion, whereupon the pinion is released from engagement with the fly wheel and maintained in released position so long as the motor is operating.

The novel manner in which is accomplished the desired results will be apparent by referring to the following description in connection with the accompanying drawing in 1d which:

Fig. 1 is a side elevational view of a starting motor to which my invention is applied.

F 2 is a disassociated view of the starter motor shaft, a pinion actuated rod and key,

the pinion, the collar on the key carrying shaft, and the spring for urging the pinion away from the ring gear on the fly wheel of the engine.

Referring now to the drawing by numerals of reference:

1 designates the starting motor, having a hollow drive shaft 2 provided with a slot 3. Extending through the drive shaft is a rod or shaft t carrying at one end a spline or key so 5, having an offset portion or shoulder 6 to provide a detent for the pinion 7, to be hereinafter described more in detail.

The pinion 7 is slidably held on the rod or shaft 4, by reason of the fact that the key or 3.) spline loosely fits in the key slot 8 of the pinion. A collar 9 engages the key or spline 5 and is held fast to the shaft ft by a set screw 10, it being understood of course that the slot 11 receives the offset portion 6 of the key 5. A coiled expansion spring 12 surrounds the projecting end of the shaft 2, one end being against the motor body and the other against the pinion, it being understood that the ends 13 and 14: of the spring can be received in recesses in the shaft slot 3 and in the pinion 7.

As heretofore stated, the rod 4 slides in the drive shaft 2 and itis operated by a yoke 15, one end of which is pivoted to the bracket 16 at 17, and the other end 18 of which may be operated in any suitable manner. When the yoke is moved to the dotted line position shown inFig. 1, the rod et'is pulled or longitudinally moved a short distance to cause the pinion 7' to move into mesh with the teeth of the fly wheel 19. i This is done before the motor ,1 is started, so liability of the pinion chewing off the ends of the gear teeth on the fly wheel will'be prevented. The longitudinal movement of the rod 1 will cause the pinion to compress the spring 12, because the to end of the pinion will abut against the shoulder or detent 6. So long as the motor 1 is turning the fly wheel under load the detent 6 will hold the pinion in mesh with the ring gear of the fly wheel, but as soon as the fly wheel exceeds the speed of the pinion (due to the fact that the motor carrying the fly wheel has started to operate) the pinion will be turned so that the slot 8 registers with the shoulder or detent 6, and due to the expansive 7 force ofthe spring 12 the pinion will be slid longitudinally along the rod 4; and along the key so that it will move out of mesh with the fly wheel, that outward movement or sliding movement being limited by the collar 9.

' Of course itis to be'understood that when the starting motor shaft rotates, the pinion controlling shaft 4 also rotates. It is also apparentthat the. offset portion of the shoul der or detent 6 will normally overlap the edge of the slot or groove 8, so that when the yoke is moved to dotted position the pinion will be drawn into mesh with the ring gear 19, then when the starting motor starts the fiy wheel will be rotated until the engine turns over with its own power, whereupon the pinion is driven by the engine momentarily until the slot 8 registers with the wider portion of the key, whereupon the expansion spring forces the pinion in the full line position shown in Fig. 1, and out of mesh with the fly wheel gear.

Attention is called to the fact that the spring has both an expansive force and a torsional force on the pinion. The effect of the torsional force will be to hold the pinion initially against the shoulder until the wide part of the key alines with the slot, then the expansive force ofthe spring slides the pinion on the key out'of mesh with the gear.

From the foregoing, it will be apparent that the device is simple in construction, positive in its operation, and liability of chewing off the ends of the gear teeth, either of the pinion or the gear, will be reduced to a minimum, if not wholly eliminated.

What I claim and desire by Letters Patent is 1. A device of the class described com rising a starter motor having a hollow drive shaft, a slidable rod in the hollowdriveshaft; provided with a key rotatable with the shaft, a sliding pinion provided with a spline slot; receiving the key and adaptably engaged by the shoulder on the key so that a longitudinal movement of the rod in one direction will impart longitudinal movement to the pinion, a coil spring exerting torsion on the pinion to normally hold the pinion against the shoulder, a side spring having expansive force to move the pinion longitudinally of: the rod when the pinion turnson the rod toaline the. shoulder and the slot in the pinion,

2. A device of the class described. comprising a starter motor having a hollow shaft provided with a slot, a slidable key'carried by the shaft having the key portion extending through the slot and provided with a shoulder, a sliding pinion on the key and. shaft having a slot to receive thekey,.aispring normally urging the shoulder in' engagement with the pinion, said spring having the expansibility toimove the pinion along the shaft when the shoulder is out of engagement with the pinion andmeans for actuating thekey 3. A device of. the class described compris ing a starter motor having a slotted drive shaft, a slidingkey. inthe slotted: drive shaft provided with a shoulder, a. pinion slidably mounted on the drive shaft; having a key receiving slot adapted to be overlapped by the shoulder, the width of' the slot being equal to the width ofthe shoulder,.means for. nor-- mally urging, the pinion into engagement-e with the shoulder,.said pinion beingcapable of having sliding movement on. the key past. the shoulder when the shoulder and slot in the pinion are in alinement, and means for moving the key longitudinally of the shaft- 4. A device of the class described, comprising a starter motor, a slotted drive shaft,.asliding key in the slotted drive shaft projecting beyond the perimeter of the? drive shaft,said key having a pinion engaging shoulder, a pinion slidable on the driveshaft provided with a slot of a width. equal to thecombined widths of the key and shoulder, means for limiting the sliding movement. of the pinion in one direction, a coiled spring between the pinion and'the case of the motor engaging'the pinion, and means for sliding; the key against the action of the spring.

In testimony whereof I affix my signature JOSIAH H. SUTTER;