US996608A - Safety-crank for explosive-engines. - Google Patents

Description

J. 1). BOWNE. SAFETY CRANK FOR EXPLOSIVE ENGINES.

APPLIOATIONTILED AUG. 18, 1910.

Patented July 4, 1911;

V 1 avwewfoz q vitmeaaca aw 0 W w ("1 How m JOHN D. Bownn, or new roan,

N. Y., ASSIGNOR or ONE-HALF TO SAMUEL L. BEVAN, or new YORK, N. Y.

SAFETY-CRAN r03 nxrtosrvn-nnernns Specification of Letters Patent.

Patented July 4, 191 1.

1 Application filed August 18, 1910. Serial No. 577,762.

.Td all whom it concern:

-.Be it known that I, J 0H1: D. BOWNE, citizen of-the United States, residing at New York, in the county of New York and State of New York, have invented certain new.

and useful Improvements in Safety-Cranks for Explosive-Engines, of which; the following is a specification. I This invention relates tosafety cranks for ezgplosive engines, particularly to those dev vices whereln a sprlng or springs is interposed to cushion the elfect upon the person operating the crank of a premature or back fire explosion.

special arrangement a and whereby it is believed the disengagement of the crank from the shaft is brought about in the shortest period of time, and thefshock of back fire of the engine is to a great extent taken up and the hand and arm of the operator correspondingly relieved and'practically guarded from in ury.

The construction and arrangement of parts comprising this invention appear in the accompanying drawings, of which- Figure 1 represents a side view ofallthe parts separated from each other upon the shaft, and about to be assembled. Fig. 2 is a front view of all parts assembled, and Fig. '3 is a side view of the parts assembled, some of them being shownin longitudinal section.

The same letter is employed to refer to the same part throughout the description and drawings.

. Upon the shaft A, the ratchet crown is" fixed by means of pin b. The outer ring ofv ratchet teeth are designated by the letter C,

and there willbe noted, as best shown in Fig. 1, an inner ring of ratchet teeth D, that project beyond the teeth 0.

The shell E fits movably upon the fixed crown B. The shell E has a series of ratchet teeth eat the rear, and a pair of slots F and F, the slot F being diametrically opposite the similar-slot F. The shell E is. adapted to receive also the ratchet ring G, the teeth of. which are referred to by the letter 9.

, Projecting from the outside of the ring Gr,

and, formed integrally with the ring, are

the arInH and lug 11., located at opposite points. -When the parts are assembled, and

thering G is passed into the shell E, the lug k and'arm enterthe recesses fand ffg'by,

way of which the lug and arm reach the slots F and F which it is intended they shall traverse.

In Fig. 1 the shell E is illustrated wall only of each of the recesses f and f are insec-i tron lengthwise of the shaft and one side.

shown. Let it"be now assumed that the ring I G has been passed'into theshell E, and that the. lug h and. arm H have passed through the recesses or openings f and f into the slots F and F. It is thought to be clear that the ring may now be'rotated partly and outer member oi cover J is slipped over the recessed end of the shell E, and covers the lugh as bestshown in Fig. 3. The arm H does not interfere with the placing of the.

already mentionedas features of the fixed crown B correspond in size and number with the teeth is. On the exterior, the cover J is provided with the ratchet-toothed center or hub M, the teeth of which, and of the boss N of the crank O are alike and are arranged to be brought into engagement when the crank is operated. The teeth on the crank boss are designated by the letter 7.

The supporting plate P, shown in Figs. 2 and 3, lies against the fixed crown B, and

the lug and arm will travel the slots. The ring and shell beingnow associated, the The object of this invention is the-production of a safety crank havingip'art's of construction, 3

the shaft passesmovably through the'plate which, in practice, is fastened to the ve'- .hicle. Upon the plate P, as shown in Fig. 3,

is a pivoted pawl Q engaging the ratchet.

teeth 6 of shell E, and which will be again mentioned. In Figs. 2' and 3 it will be also noted that the arm H of ring G is pivotally connected with the plunger R, and that the head of the plunger bears against the coil spring r, whic h may be compressed. by

means of the screw S and the adjusting disk T, engaging the screw within the dash-pot I] that contains the spring and lunger head- To explain the operationof t is invent on,- let it be assumed that the crank is engaged as shown in Fig. 3,'whereupon all the parts, excepting the fixed crow'n B and those borne byplat'e P may be moved togethertoward the plate until the teeth D, and k are partly engaged as shown. Now, the assoclated- 25 jerk uponthe hand.' As

parts would .be halted were not the latch V raised out of the space, between the annular row of ratchet teeth a and the surface of the plate P. The latch V being thus raised, the

- teeth C of .the fixed crown B in engagement with the teeth 9 of ring G. The teeth D and is are now fully enmeshed. Under 10 thoseconditions, it isthought' to be" apparent that: the shaft may be turned.

Should therebe a, premature explosion having the effect of starting the engine re-- 'versely, the engagement of the pawl Q and ratchet teeth 0 halts the shell'E, and the I dashpot U which :is attached as shown to a the shell; But, the ring.G having arm H receives the reverse impulse momentarily,

which effect or shock-would be transmitted 2 to the hand holding the crankdid not the) ie, and the inclined sides of the inner teeth D and 7c are pressed together with the result that the parts move along the shaft, that is vto say, the shell E,rin'g G, cover J, and crank O, are all forced almost instantly to- 5 ward the right, thereby disengaging the teeth, G and G InwF' resulting from back-fire has proceeded farc'lenough to release the ratchet teeth 0 an 9, 40 teeth lo and the consequent movement to the right of the parts stated will continue until teeth and 7a are free from each other. But, the movement at the point of the illustration in Fig. 3 has been suflicient to bring the ratchet teeth e away from plate P far enough to permit the latch V to fall into the space bet-ween the teeth and the plate, and, the inadvertent reengagement of teeth may now continue its backward revolution without aifectingthe hand of the operator. Itis believed to be clear from the drawings, that when the engine starts Jproper direction, in this instance ratchet teeth M and n are pressed together with the resulting disengagement of the crank O in the customary manner.

in what I claim and desire to secure by Letters Patent is 1- with the 1.. In a safety crank, the combination with a stationary plate having a of a shaft passing through the fixed to the shaft next to'the pivoted pawl, plate, a crown plate and havbest illustrated in' 1g. 3, the operation but the teeth D still bear against the.

.O and g is. in that way prevented. The shaft up in the pot connected and internally, the said ands of a watch, the inclined sides of the -h ing an outer'and tlli finl'iel series of ratchet teeth, a shell constructed to fit the crown movably, the said shell havteeth"arranged to externally and ing a series of ratchet be brought intoengagement with the pawl of said plate, the said-shell hawngopositely disposed. circumferential slots, a ashwith said shell and having within i'tan adjustable spring and a plum ger bearing againstthe said spring, a ring having ratchet teeth constructed to en a e the said outer series of ratchet teeth of said crown, the said ring armarranged to travel the said slots of the shell, the said arm of the ring being connectedi 'ivotally with the. da'slF-pot, a .cover constructed to be secured said plunger of the i having a lug and an externally to the shell and having an internal' cylindrical portion constructed to fit the said ring movably and internally, the said cylindrical portion havlng teeth. constructed to engage the inner series of -teeth of said crown,.the said cover having-also an external central portion provided with .ratchet teeth, and a crank constructed with ratchet teeth fashioned to engage the teeth of the said external central portion of the cover.-

' 2. In a safety a stationary plate having a a; shaft passing through the plates, a crown fixed to the shaft next to the plate and having an outer and an inner. series of ratchet crank, the combination with pivotal pawl, of

f teeth, ajshell constructed to fit the crown externally and movably, the said shell having a series of ratchet teeth arranged to be brought into engagement with the pawl .of said plate, the said shell having oppositely disposed circumferential slots, means for latching the shell it an adjustable spring and a plunger bearing against the said spring, 'a ring having ratchet teeth con structed to engage the said outer series of ratchet teeth. having a lug and an arm arranged to travel the said {slots of the shell, the said arm of the ring being connected pivotally with the said plunger of the dash-pot,"a cover constructed to besecured externally to the shell and having an internal cylindrical portion constructed to fit the said ring movably cylindrical portion aving teeth constructed to engage the inner series of teeth of said crown, the said cover aving also an external centralportion pro.-

. vided with ratchet teeth, and a crank con now described this invention',-

structed with ratchet teeth fashioned to engage the teeth of the said external central portion of the cover.

3. Ina safety crank, a stationary plate having a pivoted pawl, of a shaft passing through the plate,a crown .at a distance from the plate, a dash-pot connected with said shell; and having within of said crown, the said ring the combinationwith fixed to' the shaft nextto the plate and hav- 7 ing a series constructed toengage e96,oos

ing an outer and an inner series of ratchet teeth, a shell constructed to fit the crown externally andmovably, the said shell havof ratchet teeth arranged to be brought into engagement with the pawl of the plate, the said shell having a circumferential slot, a ring having ratchet teeth the said outer series of ratchet teeth of said crown, the said ring having an arm arranged to travel the slot in said shell, means including a spring for cushioning the movement of the ring with respect to the shell and connected with the arm of said ring and with the shell, a cover constructed to be secured externally to the shell and having an internal cylindrical portion constructed to fit the said ring interiorly and movably, the said cylindrical portion having teeth constructed to engage the said inner series of teeth of said crown, the said cover having also an external central portion provided with ratchet teeth, and a crank constructed with ratchet teeth fashioned. to engage the teeth of the said external central portion ofsaid cove 4:. In a safety crank, the combination with a stationary plate having a pivoted pawl, of a shaft passing through the plate, a crown fixed to the shaft next to the plate and having an-outer and an inner series of ratchet teeth, a shell constructed to fit the crown ex- Copies of this patent may be obtained for five cents each, by addressing the ternally and movably, the said shell having a series of ratchet teeth arranged to be brought into engagement with the pawl of said plate, meansfor latching the shell at a distance from the plate, the said'shell having a circumferential slot, a ring having ratchet teeth constructed to engage the said outer series of ratchet teeth of said crown, the said ring having an arm arranged to travel the slot in said shell, means including a spring for cushioning the movement of the ring with respect to the shell and connected with the arm of said ring and with the shell, a cover constructed to be secured externally to the shelland having an internal cylindrical portion constructed to fit the said ring interiorly and movably, the said cylindrical portion having teeth constructed to engage the said inner series of teeth of said crown, the said cover having also an external central portion provided with ratchet teeth, and a crank constructed with ratchet teeth fash ioned to engage the-teeth of the said external central portion of said cover.

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

JOHN BOWNE.

' Witnesses:

GEORGE E. Monnow, FREDERICK GADE.

Commissioner of Patents,

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