US1199612A - Safety cranking device. - Google Patents

Description

Patented Sept. 26, 1916.

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WITNESSES INVENTOR Geazye ff /?1 c e,

Y UNITED STATES PATENT OFFICE.

GEORGE E. RICE, HONOLULU, TERRITORY OF HAWAII.

Y SAFETY CBANKING DEVICE.

Specification of Letters Patent.

ator to safely turn the engine shaft without danger of injury to the operator' on firingvof the engine. a In order .to accomplish the desiredresult,

use is made of a cranking shaft adapted to back be connected by a soft clutch member with a clutch member of the engine shaft to 'allow of turning the latter on turning the cranking shaft, the said soft metal clutch member being adaptedto be shorn off on a return movement of the engine shaft to disclonlect the cranking shaft and the engine s a t.

A practical embodiment of the invention is represented in the accompanying. drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a sectional side elevation of the safety cranking device as applied and withthe parts in normal non-engaged position, the section being on the line 11 of Fig. 2; Fig. 2 is a sectional front view of the same on the line 22 of Fig. 1; Fig. 3 is an enlarged sectional-side elevation of the cranking device with the parts in position for turning the engine shaft on turning the cranking shaft, the section being on the line 33 of Fig. 5; Fig. 4 is an end View of the socket on the cranking shaft; and Fig. 5 is an end view of the engine shaft.

The cranking shaft A is mounted to turn and to slide in the direction of its axis on the engine frame B, and the said cranking shaft A is in axial alinement with the engine shaft C. The outer end of the cranln'ng shaft A-is provided with a handle Dand the said -c'raznkmg shaftis normally held in outermost position by" a spring E coiled around the shaft'A and resting with one end on the frame B and pressing with its other end onthe handle D.

. The inner end of the cranking shaft A is provided with a socket F carrying a screw Patented Sept. 26, 1916.

Application filed August 7, 1915. Serial No. 44,306.

or a pin Gof soft metal such as copper or other annealed metal, and the inner end of this pin G is adapted to engage one of a series of shoulders H formed on the end of the. engine shaft C. The pin G and the corresponding shoulder H. form clutch members to allow of turning the engine shaft C from the cranking shaft A at the time the latter is rotated and its socket F is engaged with the ends of the shaft 0. Now in case of back firing in the engine the shoulder H shears off the inner end of the pin Ur thus preventing injury to the operator l'lfilVflllg hold of the handle D for turning the s a 't A.

In order to prevent return movement of theshaft. A use is made of a ratchet wheel I secured on the cranking shaft A and engaged by one orjtwo dogs J fulcrumed on the frame B and'pressed on by springs J to hold the dogs in engagement with the teeth of the ratchet wheel I. Normally the socket F is out of engagement with the end of the engine shaft O, and in order to guide the pin G into engagement with a shoul der H, use is made of a latch pin K adapted to engage one of a series of recesses .F formed'in the inner surface of the socket F. The latch pin K is provided with a head K pressed on bv a spring L and held with the latter in a recess N formed in the engine shaft C next to the'shoulders H. The pin K is mounted to slide in a plug 0 screwing in the wall of the bore N. The latch pin K has beveled sides but a straight front so as to readily engage one of the recesses F on pushing the cranking shaft A inward, it 'being understood thatthe latch pin K registers with one of the recesses F at the timethe pin G is in register with one of the shoulders H. It is understood that the pin G has suflicient strength to turn the 'engineshaft C for starting theengine but in case of back firing the reverse movement given to the engine shaft C causes the shoulder H in en-' gagement with the pin G at the time to soft metal held on the said socket, a clutch member on the end of the engine shaft and adapted to be engaged by the said socket and pin to rotate the engine shaft on turnshaft and adapted to register with one of ing the cranking shaft, the said clutch memher being adapted to shear off the said pin /member on the end of the engine shaft and adapted to be engaged by the said socket and pin to rotate the engine shaft on turning the cranking shaft, the said clutch member being adapted to shear 03 the said pin on a return movement of the engine shaft, the

said socket having a series of recesses, and a spring-pressed latch pin held on the engine the said recesses at the time the saidsoft 7 pin is in register with the clutch member."

3. A safety cranking device, comprisin a. 25

cranking shaft having a socket provi ed with recesses, a pin of soft metal in the socket, a clutch member on the end of the engine shaft and having shoulders, said clutch member being adapted to enter the .30 a

socket with a shoulder in'engagement with the pin, the shoulder of the clutch member being adapted to. shear off said pin on the engine shaft, and a sliding; and .spring pressed latch pin mounted in the clutch 35 member, said pin having beveled sides and adapted to enter a recess of the socket.

In testimony whereof I have signed my name to-this specification in the presence of two subscribing witnesses GEORGE H. RICE; Witnesses: FRANK J. DoUoHERTY, GEORGE OCoNNoR.

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