USRE13862E - Safety-crank for explosive-engines - Google Patents

Description

i Ta all 'whom it may concern.'

UNITED sTATEs PATENT oEFIoE.

connes r.- wILLIAMs', or rnnnfron, NEW JERSEY.

SAFETY-CRANK Eon EXPLosIvE-ENGINES.

Beit known that I, CURLES T, WiLLIAMs, of Trenton, in the county of Mercer, and-in the State of New Jersey, have invented a certain new and useful Improvement in Safety-Cranks for Explosive-Engines, and

' do herebyl declare that the following is a full, clear, and exact description thereof.

The objectpf my invention has been to provide an'automobile crank which will be released in case the engine kicks back, so that a person cranking lthe'engine will notfbe injured, and tovsuch ends my invention consists in the safety automobile crank hereinafter specified.

I n the accompanying drawings-Figure 1 is a side elevation, partly in section, lof oneA embodiment of my invention; Fig. 2 is a 'section on the line 2--2 of Fig. 1; Fig. 3 is a top view of Fig. 1.

- In theA cranking of an automobile engine it frequently happens that' a premature explosion occurs which causes theengine to rotate the crank shaft backward, a motion for which the operator is not prepared, and

which accordingly wrenches the crank away from him and frequently causes i't to vstrike his arm, occasionally breaking the arm.

It is the object of my invention to over- 4come this difficulty and lto avoid injury in case the engine should kick back as stated. In the accompanying drawings I have illustrated the best embodiment of my invention known to me, but such embodiment is to be regarded as typical only of many possible embodiments. f

In the illustrated embodiment, the crank shaft 1, or shaft to which the hand crank is applied, is engaged with the engine shaft 2.by a clutch composed of members 3 and 4 which are automatically disengaged as soon as the engine begins to rotate' of its own power. The hand crank 5 is. mounted on the Ycrank shaft by means of a` hub 6 which is preferably integral with the hand crank, the hub being rotatably mounted on lthe crank shaft `and being prevented from longitudinal movement by the engagement of a screw 7 in the hub with the neck or` groove 8 formed in theshaft. The hub isA normally'locked to the shaft by a plug 9 Specication ot Reissued Letters Patent. Reigsued J an. 5, 1915.

r Original No. 1,042,303, dated October 22, 1912, Serial No. 635.671.` .1914. Serial No. 887,669.

Application for reissue led 0ctober20,

' which is reciprocally mounted'in the hub and which has a preferably tapered Aend. which engages the tapered recess 10 in the shaft. The plug is preferably provided with a collar or other enlargement 11, which,

by engagement with a shoulder 12in the j plug. The plug isi normallyl forced outward by a spring 13 surrounding theplug and resting on the shoulder l2, said spring engaging a cross pin 14 in the plug. The plug is held in inner orV locked position by a. lever.15, which is secured by a pivot, such as the screw 16, to the hub. The said lever preferably has a depression 17 formed on its under side so astto yieldingly engage the -rounded end ofthe plug and thus to require` -some little force to swing the lever from over the plug. A pawl 18 is pivoted to 'l1ub,'limits the outward `movement of the.V

the outer end of the said lever, the pawl and lever having shoulders at' 19 which limit the movement of the pawl in the directionof the arrow shown in Fig. 3, while movement in the opposite direction is permitted, but yieldingly resisted by a spring 20. A ratchet disk 21 is looselvmounted on the hub and is provided with 4a weight 22 or other means for normally maintaining it in a fixed position.Y A split bushing 23' is mounted on the hub, or a sleeve extension thereof. `and provided with a draw bolt 24 by which it may Vbe'made to c lampthe said hub or sleeve. A latch 25 is pivoted on the' 3 and 4- and starts to crank the engine. Dur-v ing this motion the pawl 18 rides idly over the teeth of the ratchet disk. If the engine should explode prematurelyor back fire, and jerk the crank in'the reverse direction from: that indicated by the arrow in Fig. 3. the ratchet disk, being held from rotation by` the weight, would engage the l naled on .sa-id hub, and adapted to engage a shoulder on said lever,

f be connected to beveled in normal cranking pawl and prevent its rotation with the crank shaft, thus causing the pawl, by engageinentfof the shoulders atl9, to swing Vthe lever 15 from over the rounded end of the plug, and permitting the spring 13 to withdraw the plug, releasing the hand crank from the crank shaft. The operator will thus be saved from injury by the back lire.

In order to hold the crank in a vertical position, asisjdesirable when theengme is running, the'latch 25 may be engaged in the Vnotch vin .the ratchet split bushing is. clamped to the shaft, this Will lock the shaft to the weighted vratchet disk and prevent the 4shaft and hand crank from rotating. l

I claim- 1|. In a-s'aety crank for explosive engines, the combination ofl a shaft adapted to be connected to an engine, ahand crank for rotating the same, having a hub jourshaft, a plug mounted in said said shaft, a lever adapted to be swung over said plug and to hold the latter in locked position, a finger yieldingly mounted on .and a relatively stationary shoulder adapted to hold said finger and to swingsaid lever from over said plug.

2.' In a safety crank for explosive engines, the combination of a shaft adapted to having a hub journaled on said'shaft, a plug mounted irl-said hub adapted to engage a `shoulder onl said shaft, a spring tending to retract said plug, a lever adapted in fone position to stand over said plug and hold thel latter in locked position, a finger pivoted tov said lever and yieldable when said crank is moved in normal cranking direction, and a relatively stationary shoulder against which said fingeris adapted to catch during backward movement of said crank.

3. -In a safety crank for explosive engines, the combination-of a shaft adapted to be connected to an engine, a hand crank having a hubjournaled von said shaft, a plug mounted on said hub and adapted to engage a shoulder on said'shaft, a spring for reti-acting said plug, a lever adapted to swing over said plug and hold it in locked position,l a finger pivoted to said lever and yieldable in a direction away from normal cranking movement, and a-ratch'etfdisk Ahav-- ing teeth adapted to engage direction.v

4. In as afet.. crank forexplosive engines, the'combination of a shaft adapted to be connected to an engine, a hand crank having a hub journaledon said shaft, a plug mounted onsaid hub and adapted to engage 'avshoulder on said shaft, for retracting said plug, .a lever adapted to swing over said plugv and hold it in forret1acting said plug, ,swlng over said an engine, a hand crank v ratchet disk.

'yieldable in' cranking movement, a `ratchet Adisk having.

said linger and I enga 18 a spring yieldable locked position, the end of said plug being 5. In a safety crank for eziplosive ein-f gines, the combination of a shaft adapted to be connected to an engine, aving a hub`journaled on plug mounted on said hub engage a shoulder on said said shaft, il

shaft, ,a spring alever adapted to plug and hold itin locked position, a finger pivoted to said lever and yieldable in a direction cranking movement, a teeth adapted to engage said finger an beveled in normal cranking direction, means for preventing the rotation of ratchet disk.

6. In a safety crank for gines, the combination of a .to be'connected to an engine, having a hub journaled on said Shaft,. plug lmounted on said hun and adapted ,to engage a shoulder on'said shaft', a spring for retracting said plug, a lever adapted, to swing over said plug and hold itin locked said explosive shaft adapted a .hand crank and adapted to..

and

a hand crunk away from normal i ratchet disk having 7 position, a finger pivoted to said lever and yieldablein adirection away from normal cranking movement, a ratchet disk having teeth adapted to engage said finger and beveled in normal crankingdircction. and means for preventing the rotation of said Weight attached thereto.

7. In a safetv crank for explosive engines, thecombinationvot a shaft adapted to be connected to an engine, a hand crank having a hub journaled on said plug mountcdlon said hub engage a shoulder on lsaid shaft. a spring forvretracting said plug. a lever adapted to swing over said plug and hold it in locked position. a tinger pivoted to said lever and a direction awav from normal said means comprisingaf shaft.- a v and `adapted to beveled in normal cranking direction,

means for preventing the rotation of said y ratchet disk. and meansfor fastening said crank to said ratchet disk.l v i In a satetvl crank for explosive enf Eines. aicombination of a shaft adapted to,

be connected, to an engine, a` hand crank,

havinga hub journaled on said shaft; a plugmountdonsaid huh and adapted to a shoulder onfsaid shaft. a'sprin for retracting said plaga lever positiomanger pivoted to saidlever and 1n a'du'ectlon away from normal adapted to I I 'swing over said plug'and hold it in locked cranking movement, a ratchet disk having said ratchet disk that would be engaged by seethl xdapted tf1) englge sdaid finger and` said latch.

eve e in norma cran (ing irection, means for preventing the rotation of said ratchet CURLES T' WILLIAMS' 5 disk, and means for fastening said crank to Witnesses:

said ratchet disk, said means comprising a EARL'KELTY, latch carried by said hub and a notch on HOWARD HEATH.

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