US1007608A - Safety cranking attachment for internal-combustion engines. - Google Patents

Description

e; w. SAGE. I SAFETY GRANKING ATTACHMENT FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED JUNE 12, 1911. v

Patented 001;. 31, 1911.

Ill/4 GEORGE W. SAGE, OF SAN DIEGO, CALIFORNIA.

SAFETY CRANKING ATTACHME1\TT FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Patented Oct. 31, 1911.

Application filed June 12, 1911. Serial No. 632,598.

To all whom it may concern:

Be it known that I, GEORGE W. SAGE, a citizen ofthe United States of America, residing at San Diego, in the county of San Diego and State of California, have invented certain new and useful Improvements in Safety Cranking Attachments for Internal-Combustion Engines, of which the following is a specification.

This invention relates to a safety cranking attachmentjor internal combustion engines and particularly for automobile engines, the object of the invention being to provide a manually operable member which 5' when turned in one direction, will positively engage the engine shaft, together with means for disconnecting said manually operable member from the engine shaft upon any initial reverse movement of said shaft.

It is a well known fact that many persons have been seriously injured by the premature explosion of the charge in the cylinders of internal combustion engines, this being usually occasioned by having the spark too far advanced so that the spark occurs before the engine passes over the center. It is to prevent accidents under such conditions that the present invention is particularly designed.

Further objects and advantages of the invention willloe set forth in the detailed de scription which now follows.

In' the accompanying drawing, Figure 1 is a plan view of theyertical portion of the chassis of an automobile showing theinvent-ion applied thereto, Fig. 2 is a front elevation of the cranking attachment, Fig. 3 is a plan view thereof, Fig. 4 is a sectional view thereof, and Fig. 5 is a detail face View ofa pulley which may be employed if desired.

' Like numerals designate corresponding parts in all of the figures of the drawing.

Referring to the drawing, the numeral 5 designates one of the cylinders of an internal combustion engine and 6, the shaft thereof. Fixed rigidly upon the front end ofthe shaft 6 is a ratchet wheel 7 that is provided with a hub or sleeve 8. The hub or sleeve 9 of a second ratchet wheel 10 embraces the hub or sleeve Sand serves to space the ratchet wheel 10 from the ratchet wheel 7. The sleeve 9 likewise forms a bearing for a ring-like portion 12 of a crank handle 13.

The handle 13 carries-a pawl 14 thatis of such width as to vengage both the ratchet wheel 10 and the ratchet wheel 7. A spring 15 carried by the handle 13 bears againstthe underside of pawl 14 to normally hold saidpawl into engagement with the teeth of the ratchet wheels. I

V A collar 16 is fixed upon the shaft 6 by a set screw 17 and is provided with a reduced portion 18. This reduced portion forms a bearing for the ring-like portion 19 of an arm 20. The arm 20 is fixed by a screw or other fastening device 21 .-to a crossbar 22 of the chassis. The arm 20 carries a pawl 23, this pawl being normally held by a spring 2 1 into engagement with the teeth of ratchet wheel 10. v v

The operation of the device is as follows: When the handle is turned in a forward direction or in the direction of the arrow in Fig. 2, the pawl 14 engages the teeth of the ratchet wheels 7 and 10, carrying them to the right in Fig. 2 and turning the engine shaft 6 in the proper direction tocrank. the englne, it being understood that the ratchet wheel7 is fast upon the shaft and that the ratchet wheel 10 is loosely mounted. The pawl 23, however, prevents reverse movement of the ratchet wheel 10. The teeth of the ratchet ,wheel 10 are very slightly longer than those of the ratchet wheel 7. If the engine back fires and the ratchet wheel 7 starts to move rearwardly, initial rearward movement of said ratchet wheel 7 starts to move the handle 13 rearwardly through the medium of pawl 14, but the ratchet wheel 10 cannot move rearwardly' because of the pawl 23, and consequently pawl 1 L rides up one of the teeth of ratchet wheel 10 and in so doing, is lifted out of engagement with the teeth of ratchet wheel 7, after which the ratchet wheel 7 and the engine'shaft may rotate rearwardly without moving the handle 13. The movement necessary to thus free the pawl 14 of the teeth of the ratchet wheel 7 is a very slight one, not enough to cause the operator any discomfort. i I

If desired, a pulley 13" may be employed in the place of the handle 13, this pulley carrying a pawl 1 1 corresponding to the pawl 14:. This structure is illustrated in Fig. 1, and the pulley is illustrated in Fig. 5. In other respects, the structure is the same as that shown in Fig. 2 and the same reference numerals hav'e been applied.

' From the foregoing description. it will be seen that simple and etlicient means -are herein provided for accomplishing the objects of the invention. but while the elements shown and described arewell adapted to serve the purposes for which they are intended, it is to be understood that the v invention is not limited to the precise conwhat I mounted thereon, the last named ratchet wheel being slightly larger than the first named ratchet wheel, a pawl engaging the loosely mounted ratchet wheel for preventing reverse movement thereof, an operating carried by said operating member, of such [width as to engage both of said ratchet wheels, initial reverse movement of the fixed ratchet wheel carrying the operating memher and its pawl rearwardly until said pawl is lifted out of engagement with the teeth 1' of the first named ratchetwheel by riding up one of the teeth of the loosely mounted l ratchet wheel..

In testimony whereof I aflix my signature t in presence of two witnesses.

GEORGE XV. SAGE.

Witnesses:

MARY Russ, H. M. VOLLMER;

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents,

Washington, D. C.

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