US2271216A

US2271216A - Starting device

Info

Publication number: US2271216A
Application number: US347577A
Authority: US
Inventors: Ysskin Samuel
Original assignee: Individual
Current assignee: Individual
Priority date: 1940-07-26
Filing date: 1940-07-26
Publication date: 1942-01-27
Anticipated expiration: 1959-01-27

Description

Jan. 27, 1942. s. YSSKIN STARTING DEVICE Filed July 26, 1940 INVENTOR ATTOR Y5 Patented Jan. 27, 1 942 UNITED STATES PATENT OFFICE STARTING DEVICE Samuel Ysskin, Newark, N. J. g

' Application July 26, 1940, Serial No. 347,577

6 Claims.

This invention relates to an improved starter for internal combustion engines. The starter is of the type that utilizes a cam action for advancing the pinion of the starter to the gear of the engine and combines the cam action with a cushion for smoothing out the contacts of the pinion and gear and further combines the cushion and cam action to co-operate in releasing the cam action if the engine kicks back or for some other. reason the pinion or gear become locked against movement.

The invention is a starter that is very compact, easily assembled, and has few parts which insures its operation. In addition, the device can be cheaply made due to the easy machining of the various parts.

The invention is illustrated in the accompanying drawing. In the drawing Figure 1 is a side view of a starter of the improved form, with the parts in normal or inactive. positions.-' Figure 2 is a side view with the parts in position to start the engine, some parts being shown in central vertical section. Figure 3 is an end view of the starter shown in Figure 1. Figure 4 is a detail side view of cams which propel the engine engaging member. Figure 5 is a perspective view of the cam that is secured to the shaft and fixed against longitudinal movement.

The starter is installed in the usual position adjacent a gear ID on the engine and is secured on shaft II which is rotated by an electric motor. n the shaft is a sleeve l2 which rotates with the shaft. On the end of the shaft is a cam member I3 which is in the form of a shell, one face of which is provided with two semi-circular cam surfaces l4 and has the stop faces l that limit the return movement of the engine engaging member. The sleeve l2 and cam member l3 are held in place by a bolt or screw l6 which is screwed into the cam member and extends through a hole in the sleeve and into a recess in the shaft Ill.

The sleeve has a cushion l1 secured to it, the cushion usually consisting of an annular block of rubber resting against a washer l8 held on the sleeve by the split ring IS. The other face of the rubber cushion is engaged by a flange 2l that; is part of a barrel which embraces the cushion I! but can clear and pass over the outside of the washer ill to allow the cushion to be compressed. The washer I8 is held in place by the ring I! but the flange. 2| can be pressed against the cushion by a slidable member to be hereinafter described.

' the end wall of the casing 23. The pinion 24 fits over the extension 21 of the casing 23.

The cam member 22 fits over the sleeve l2 loosely enough to slide along the sleeve and has two semi-circular cam surfaces 28, complemen-.

tary to the cam surfaces l4 of the cam I3, and has stops 29 for engaging the stops l5. The .cam member includes a flange or spider 30 secured in the casing 23 by the split ring 3i The spider includes lugs 32 which fit into recesses 33 of the casing 23 to cause the flange and casing to rotate together. The two lugs which are below the centre of the shaft are heavier than the one on top when the starter is at rest, this causing these parts to advance under initial'starting and delaying any appreciable rotation of the pinion until the pinion engages the gear I0.

A spring 33 is interposed between the movable cam member 22 and the fixed cushion H. The

spring 33 is a light spring coiled around the sleeve This slidable member comprises a cam member I 2 and acts to keep these parts normally separated. The spring 34 is not strong enough to hamper the operation of the device but is strong enough to keep the cam 22 from riding out of place which might otherwise happen due to the vibration in travel in the case of an automobile or small boat.

The operation of the device is as follows:

The starter is in the position shown in Figure 1. The shaft II is energized and the cam -l3 is thus rotated. This causes the cam surfaces [4 and 28 to co-operate. As the cam i3 is secured in place the rotation of the cam I3 operates on the cam 22 to force the slidable member which comprises the cam 22, the spider 3B, the casing 23 and the pinion 24 longitudinally to the position shown in Figure 2. The start is sudden and the weights 32 below the center'keep the casing 23 from rotating toany appreciable extent. The action is cushioned by the engagement of the spider 30 with the barrel 20 and this in turn with the cushion l1 and the casing and pinion 24 begin to turn and the gear In is rotated. The tension on the parts is thus gradually increased and the starting action takes place without shock and without noise. point is shown at a when the cushion is encountered and at b when the maximum normal strain is met, this position being shown in dotted outline. If, for any reason, the resistance to operation might cause damage and require repair, the cushion receives its maximum compression. The

The position of the cams at this parts are so proportioned that the compression of the cushion permits the cam 22 to travel far enough to clear the cam l3. This position is shown by broken lines at c in Figure 4 and the over-ride of the cam relieves the strain on the starter device and the electric motor.

After the engine starts the increased speed of the pinion 24 moves the casing 23 and its connected parts back into normal position, the cam 22 is moved back until the stops I5 and 28 engage and is held there by the light spring 33.

The operation of the starter is silent and prompt the cushion l'l acting to first, soften the operating contact with the gear l0 and, second, to aid in transmitting the torsional strain after the cushion had undergone some compression and, finally, to be compressed to an extent that allows the high points of the cams to ride over each other.

The device can be made cheaply and the assembly is easily and readily accomplished.

I claim:

1. An engine starter comprising a motor shaft, a cam secured on the motor shaft and having two cam surfaces each extending for half the circumference, a companion cam fitting into the first cam and slidable relative to the shaft, a casing secured to the second cam and including a pinion on the end, a cushion inside the casing, means on the shaft for securing the cushion against sliding relative to the shaft and in the path of the second cam, the throw of the cams and the compression of the cushion being proportioned to allow the cam to over-ride when the cushion is compressed beyond normal operation strain.

2. An engine starter comprising a motor shaft, a cam secured on the motor shaft and having two cam surfaces each extending for half the circumference, a companion cam fitting into the first cam and slidable relative to the shaft, a casing secured to the second cam and including a pinion on the end, a cushion inside the casing, means on the shaft for securing the cushion against sliding relative to the shaft and in the path of the second cam, and a spring of slight power interposed between the cushion and the second cam.

3. An engine starter comprising member secured on theshaft and having -two semi-circular cams on one face of the member, an engine engaging member comprising 'a casing, a pinion on one end of the casing, and an extension having two semi-circular cams engaga shaft, a cam ing the cams of the cam member, a cushion device secured against movement away from the cams, the cushion device being within the easing and having a flange to be engaged by the casing, the parts being disposed to prevent the cams from over-riding under normal strain and ,engaging the cams of the cam member, a cushion device secured against movement away from the cams, the cushion device being within the casing and having a flange to be engaged by the casing, the parts being disposed to prevent the cams from overriding under normal strain and thus under normal compression of the cushion, and permitting the cams to over-ride uncler'excess strain and extreme compression of the cushion, and a light spring between the casing and the cushion for causing their separation when the starter is at rest.

5. An engine starter comprising a motor shaft, a slidable member on the shaft, the slidable member including a pinion and also including 'a cam on one end, the cam extending for onehalf the circumference of a circle, a cushion disposed to be engaged by the slidable member and secured against movement longitudinally of the shaft, a cam on the shaft extending for a half-circle and complementary to the shaft on the slidable member, and a light coiled spring interposed between the cushion and an element of the slidable member.

6. An engine starter comprising a motor shaft, 8, slidable member supported by the shaft, the slidable member including a pinion on one end and a cam on the other end, a cushion disposed so as to be engaged by an element of the mov able member, means on the shaft for securing the cushion against longitudinal movement relative to the shaft, and a cam secured to the shaft and complementary to the cam on the slidable member, the extreme compression of the cushion being greater than the throw of the cams whereby excess resistance to the pinion will cause the cams to override.

SAMUEL YSSKIN.