US1007775A - Safety starting-crank for explosive-motors. - Google Patents

Description

\ G. R. ELLIS. SAFETY STARTING CRANK FOR EXPLOSIYE MOTORS.

I APPLICATION FILED AUG. 22, 1910.

. 1,007 775. Patented Nov. 7,1911.

llllllllllll M rum" i OFFICE.

CHARLES R. ELL'lfiJ,

0F STOCKTON, CALQ'EFORNIA.

SAFETY STARTING-GREEK FEB IEXfELGSIV'E-MOTORS.

Specification of Letters Patent.

Application. filed August 212, 1910. Serial No. 578,417.

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Sis-to of California; have invented certain and useful Improvements in Safety Slburif g-ilranks for Explosive-Motors; and

.l do declare the following, to be a full, clear and exact description of the some, such. as i will enable ol-hers skilled in the m to which it appertnins to make and use the seme,reference being had be the accompanying draw ings, and to the characters of reference marked thereon, which form a. part of this application.

This invention. relates to improvements in explosive moc'ors and particularly to the starting cranks thereon, the object of the invention being to produce such a. starting crank as will not throw beck-when the motor buck fires but will remain stationary dun ing such. beck fire.

A further object of the invention is to produce a. simple and inexpensive device, and yet one which. will be exceedingly ef fective for the purposes for which it is do signed.

These objects I accomplish by means of such structure endrelativearrangement of x parts as Will fully appear by a perusal of the following specification end claims.

In. the drawings similar characters of reference indicate corresponding parts in the several views.

' Figure 1 1s a side elevation of y J iroved startln crank. Elm 2 1s a veriicel longitudinal section of the some. Fig.

3 is u side elevation of the interior of the crank proper. Fig; 4 sectional view taken on s'line of Fig, Fig. 5 is u .i'ront elevciion oi c Michel; host and dogs therein. Fig. 6 is c, from; elevstion of an internal ratchet Wheel. Fig; 7 is a side elevation of supporting box. Fig.

8 is a front elevation of the crank shaft of the motor showing a pawl carrying box thereon l llg ll is e side elevation of the some. Fig. 10 IS a sectional view'telzen relatively on a line of Fig 9. 11

a. sectional view taken on a line 2--c of Fig. 2. v

Referring now more particularly to the characters of reference on the drawings, 1 designates a crank shaft of on engine having the usual clutch 2 at its outer iac receive the starting crenlr;

Eaton, in the county of San Joaquin,-

The starting crank of my improved device is constructed substantially With a handle 3 having a projecting sleeve 4 in which is a freely. turnablc pin'5 held against longi- Pat'ented Nov.. '7, 1911.

hu'lincl movement by means of a set'screw 6 projecting through the sleeve linto the groove 7 in said pin 5. The inner end of said sleeve 4 has a shoulder 8 normally op-- crating against a spring 9 disposed around the pin 5 the other end of said spring 90peraiing against a shoulder 10 on the collar 11 forming a pert of the pin 5, the inner end of said pin 5 having aclutch 12 to en-.

gage the clutch 2. In cranking the engine the hendle ii is operated hichcauses the sleeve & to operate against the spring *9 to turn the collar 11 and incidentally the pin 5 which being clutched to the crank shaft 1 by the clutches 12 and 2 turns such crank shaft as isdesired.

Now when the engine back fires and the crankshaft 1 reverses from its normal for- Ward movement, I throw the two clutches 12 and 2 out of engagement with each other by means of the following structure, viz: Suitably mounted on the crank shaft 1 is s cone 13- hnving a flange 14; screwed into n box. 15 having racchets 16 engaged by pawls 1'3 pivoielly secured in the ratchet box 18 which is secured to the shaft 1. pu vvls 17 are held normally in engagement with the mic-hots 16 by means ofwsprings 19, the lower ends of said pawls projecting into the box 18, such pevvls 17 being adapted to iurn the box 15 when the shaftr 1 turns back Weird henihemotor buck fires.

Thisbox loprojects from the member 11 andis held in position thereon by means of flanges 20 and 21' which secure the member 15 to a flangoor collar 22 on the said collar 11.

Now when the engine back fires and the pelvis 17 engagingthe ratchets 16 turnihe box lo es described; the same is pulled for Werd'by reason of the pins" 23 moveblein curving slots 24 in a box 25 fixed stationeryvvitb. respect to the other parts of the crank by means of straps 25 adapted to be connected with the frame of the motor or the frame of the vehicle. to whichth motor is attached. This forward movement causes the cono'13 to move in between the paWls 17 and spread them apart thus disengagingthem from the ratchets 16 and permitting the crank shaft 1 and box 18 to turn freely and the clutches 12 and 2 having been in She meantime disengcged by reason of the The box 15 moving the collar 11 and putting its disconnected parts forward, the sleeve 4 and handle 3 having been held stationary during this operation by reason of dogs 26 engaging ratchets 27 on said sleeve 4, said dogs 26 being mounted in the box 28 and held normally in engagement with said ratchets 27 by means of springs 29. a The first start of the backward movement of the crank 1 is received by the spring 9 which overcomes any tendency to tearing apart,.

the set screw 6 would impinge in order to operate the parts if the tension of the spring 9 was a little too weak.

From the. foregoing description it will readily be seen that I have produced such a safety starting crank as will not recoil with the back fire of the engine, but which will remain stationary and be immediately disengaged with the crank shaft when the back fire occurs.

lVhile this specification sets forth in detailthe present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:

1. In a device of the character described, the combination of a crank shaft, a starting crank comprising a handle, a sleeve on said handle,a pin projecting into said sleeve in a freely turnable manner, means holding said pin against longitudinal movement in said sleeve, a shoulder on saidsleeve, a collar on the end of said pin at a spaced distance from said shoulder, posed between said shoulder and said collar a means on said collar for engaging said crank shaft, and means interposed between said crank shaft and said sleeve for disengaging said engaging means on said collar from said crank shaft when said crank shaft moves backward as described.

2. In a device of the character described, the combination of a crank shaft, a starting crank adapted to engage said crankshaft, a box secured to said starting crank and a spring interprojecting over said crank shaft, an internal ratchet wheel on said box, pawls secured to said crank shaft and adapted to engage said ratchet wheel and turn said box when said crank shaft moves backward, a means operating within said box and adapted to throw said pawls out of engagement with said ratchet wheel when said crank shaft moves backward and means for throwing said starting crank out of engagement with said crank shaft when said box turns as described.

3. A crank shaft, a starting crank adapted to engage said crank shaft, an internal ratchet wheel, a box secured to said crank shaft and having pawls engaging said ratchet wheel, a cone slidable on said crank shaft and secured to said ratchet wheel, means for sliding said cone forward when said crank shaft turns backward whereby said pawls will be disengaged from said ratchet wheel, and a means for connecting said ratchet wheel with said starting crank whereby when said Come and ratchet wheel moves forward, said starting crank will be disengaged from said crank shaft as described.

In testimony whereof I afiix my signature, in presence of two witnesses.

CHARLES R. ELLIS.

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

Washington, D. G.

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