US1288443A - Safety cranking device. - Google Patents

Description

A. L SANDBO.

SAFETY CRANKING DEVICE.

APPLICATION FILED MAY 11. 191B.

Patented Dec. 17, 1918.

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A. I. SANDBO.

SAFETY CRANKING DEVICE.

APPLICATION mu) MAY n 1918.

1,288,443. Patented Dec.17,1918.

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:llnvenrco ANTON-LI. SANDZBO, OF ROCK ISLAND, ILLINOIS.

SAFETY CRANKING- DEVICE.

Appli ca'tion fil'e'd May 17, 1918.

To (ZZZ whom it-mayconc'ern:

Be it-known that I, ANTON I. SANDBo, a citizen ofthe United States, residing at Rock Island; in the county ofRo'ck Island andf-State of Illinois,- have invented certain new and useful Improvements in Safety Cranking Devices; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enableoth'ers skilled" in the art towhich it appertains to make and use the same.

This invention relates to starting mechanism for the. internalcombustion engines of automobiles, motor boats and in fact any engines-"of this-class adapted to bemanually The primary'object-of the invention is to provide'; improved automatically operating safety mechanism for disengaging the starting crank' from the shaft of the motor in the event ofback'firing of the motor, whereby toprevent injury to the operator.

' A further object of the invention is to simplify-the construction and improve and insure the practical operation of such mechanism when such backfiring takes place, such back firing usually resulting from premature ignition in the cylinder of the enginez With these objects in view the invention consistsin the im proved construction, arrangement" and combination ofthe partsof the mechanism of the character specified, which will be hereinafter fully described and afterward specifically claimed.

In order that theconstruction andoperation thereof may be readily comprehended, Iliave illustrated an approved embodiment of my' inventionin the accompanying drawings, and willno'w proceed to fully describe the same in connection with said drawings, in which 'Figure 1rep'resents,.in front end elevation, the starting" crank and the adjacent P 5,

- i Fig. 2,'a transverse, vertical, sectional view -'on';thejplane indicated by the broken 'line' 2- 2of 'Fig 3, looking in the direction of-the arrow,

Figs-3, mostlya view in side elevation Specification of Letters Patent.

Patented Dec. 17, 1918.

Serial No. 235,117.

showing the parts from the end of the engine shaft to the crank, inclusive, the aut0- mobile spring and its case being shown in section,

Fig. 4, a view similar to Fig. 3, except that all of the parts carried on the crank and its shaft are shown in section,

Fig. 5, a view, in side elevation,'of the ring which carries the lugs for engaging in the slots of the release cams,

Fig. 6, a view, in side elevation, of the drum which receives the ring of Fig. 5,

Fig. 7, a detail top plan view of the crank fastener,

Figs. 8 and 9, detail views of the release cams or brackets, and

Fig. 10, a sectional view of a modified drum to be used on a straight shaft.

Like reference characters mark the same parts in all of the figures of the drawing.

Referring specifically to the drawing, 12 indicates the end of the shaft of the motor having a diametrically projecting pin 13, which engages the teeth of the usual ratchet 14', secured by a pin 14 to the end of the shaft 15 of the starter, during the operation of starting the engine in the usual manner by turning the attached starter crank 16, the starter shaft 15 being normally pressed into position with relation to the engine shaft by a spring 17 surrounding said shaft 15' the shaft being inclosed in a cylinder 18 against which one end of the spring inclosed in a sleeve 19, engages, while the other end presses against a ring 20 secured around the shaft 15 to hold said shaft away from the engine shaft with the teeth of the ratchet 1 1- clear of and out of the line of the pin 13.

21 indicates the front cross bar of the chassis which is formed with open bottom to receive a spring 22 which is held in the cross bar by the clamps 23 and nuts 24L, 25. The nuts 25 also clamp in position the release brackets 26 and 27 the stems 28 of the clamps 23 on which the nuts are threaded passing through openings 29 in the horizontal flanges 30 of the brackets 26 and 27.

On the starter crank shaft 15 is a drum 31 (see-Figs. 3, 4i and .10) secured by screws 32- 'to said shaft, and serving to receive screws 33 by which the crank fastener 34 is held tight against the drum, the fastener having a curved wedging inner surface 35 which, when the screws 33 are tightened up serves to bind these parts tightly to the crank shaft.

The drum 31 is surrounded by a ring 36, and has in its outer peripheral surface a series of cups 37, the ring having in its inner surface substantially triangular shaped pockets 38 opposite said cups, a ball 39 being loosely placed in each of said pockets.

Any desired number of pockets may be used as at the left of Fig. 2, and the remainder of the drum recessed to reduce its weight and balance the same, as at the right of said figure.

WVith this construction, when the crank is turned to the right, the balls will roll up into the larger upper ends of the pockets and thereby release the drum and ring but in case the engine back fires, or for any other reason the crank is turned to the left, the balls will drop into the shallow ends of the pockets and cause the drum and ring to turn together.

The release brackets 26 and 27 are provided with curved bodies 40 in which are slots 41 in which are seated lugs 42 on the backward by the engine shaft.

The utility and simplicity of my invention will be evident from the foregoing and I desire to be understood that changes and variations may be made from the specific construction described, without departing from the spirit and scope of the invention.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. The combination with the front bar of the chassis and the crank shaft of a starter, of release brackets secured to the chassis bar and provided with inclined slots, a ring surrounding the crank shaft and provided with lugs engaging in said slots, and means for releasing said engagement when the shaft is turned backward or to the left, as by back firing of the engine.

2. The combination with the front bar of the chassis and the crank shaft of a starter, of .release brackets secured to the chassis bar and provided with inclined slots, a ring surrounding the crank shaft and provided release.

with lugs engaging in said slots, and means for releasing said engagement when the shaft is turned backward or to the left, as by back firing of the engine, said releasing means comprising a drum within the ring provided with exterior pockets in its periphery, interior triangular pockets in the ring, with their narrow ends to the left, and balls which wedge down into said narrow ends causing the ring and drum to rotate together with the shaft thus forcing the'lugs of the ring to travel in the inclined slots of the release brackets and force the shaft rearwardly in case of back firing. Y

3. The combination with the engine shaft having a lateral pin, a starter crank shaft having a ratchet at its forward end, a spring normally maintaining the ratchet in engagement with the pin to cause the engine shaft to be turned to the right when the starter crank is so turned, the chassis rear bar, release brackets secured to said bar and having inclined grooves, a drum on the crank shaft,

. turning therewith, and having exterior peripheral pockets, a ring around the drum having tr angular pockets narrowing tothe left, lugs on the ring engaging in the slots of the release brackets, and balls in the cups and pockets which remain in the wider parts of the pockets when the crank shaft is turned to the right and permits the drum to rotate with the shaft without carrying the ring with it, the balls wedging into the narrow ends of the pockets. whenthe'shaft and drum are turned to the left carrying the ring and its lugs with it,'thus withdrawing the starter shaft ratchet from engagement with the pin of the engine shaft. 4. The combination with a starter crank shaft, of a drum secured thereon, andna crank fastener disposed upon said shaft to extend between the drum and shaft and. secured to said drum. 5. The combination with a starter crank shaft, of a drum secured thereon, a crank fastener having a curvedwedging inner surface disposed to extend between said drum and shaft, and means for securing said fastenerto said drum. v I 6. The combination with a support and an engine cranking shaft, of a bracket having an inclined slot, a lugprojecting into said slot, one of said parts being mounted to rotate with the cranking shaft and disposed to impart an axial movement thereto and the other. being stationary, and means for throwing the cranking shaft outwardly upon its 7. The combination with a fixed support shaft whereby the ring will rotate withithe cranking shaft in one direction, release name to this specification in the presence of brackets each havin an inclined slot, lugs two subscribing witnesses.

projecting into sai inclined slots, one of said two last named elements being station- ANTON SANDBO" 5 ary and the other movable disposed to im- Witnesses:

part an axial movement to said shaft. CARL J. Mfrom,

In testimony whereof I have signed my CARL KI'iHL.

Copies of this patent may be obtained for five cents each, by addressing the "Gommissioner oi Iatentn, Washington, D. 0.

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