US1388929A

US1388929A - Ratchet mechanism

Info

Publication number: US1388929A
Application number: US414899A
Authority: US
Inventors: Edwin W Bullard
Original assignee: Winchester Repeating Arms Co
Current assignee: Winchester Repeating Arms Co
Priority date: 1920-10-05
Filing date: 1920-10-05
Publication date: 1921-08-30
Anticipated expiration: 1938-08-30

Description

E. W. BULLARD.

RATCHET MECHANISM.

APPLICATION FILED 0cT.5. 1920.

Patented Aug. 30, 1921 f j 2 SHEETS-SHEET l. ga W Ill [5 a9- I I n I E. w. BULLARD.

RATCHET MECHANISM.

. APPLICATION FILED OCT. 5. 1920.

PatentedAug. 30, 1921.

ZSHEETS-SHEET 2.

" m1 minim; I

, vBe it .known thatI, EDWIN W.

UNITED ST TE- ED IN W. BULIQARD, or WHITNEYVIL E, CONNECTICUT, ASSIGNOB, TO WINCHESTER PA OFFICE.

nnrnmrmsnnmsoo, or NEW-HAVEN, connno'rronr, A CORPORATION.

' narrower MECHANISM. 4

Specification of :LetterS Patent. Patnfied Aug, 30, 1921.

Application filed October 5, 1920; Serial No. 414,899.

new. and useful Improvement in Ratchet Mechanisms; and I dohereby declare the following, when taken in connection with the accompanying draw-ings'and the characters of reference marked thereon,'to bea full, clear, and exact description of the same, and which saiddrawings constitute part of this application, and represent,; in-

Figure 1, a view in side elevation of abitbrace embodying my improved ratchet mechanism, the crank-lever of the brace being broken away. I i I Fig. 2, a plan View thereof." Fig. 3, an enlarged viewthereof in verticalcentral longitudinal section.

Fig. 4:, an enlarged view in vertical transverse section on the line 41-4 of F ig. 3.

Fig. 5,.a view in central horizontal section on the line 5-5 of Fig. 3, the PELWLOPBI'MDL ing ring being positioned to permit both pawls to be engaged with the ratchet.

Fig. 6, a corresponding view with the pawl-operating ring turned to disengage one of the awls from the ratchet.

Fig] a detached perspective view of the pawl-operating ring. i

Fig. 8, a detached view, partly in plan and partly in horizontal section of one of the paw ls. Fig. 9, a view thereof in side elevation.

Fig. 10, a view thereofin'front elevation. My invention relates to an improved ratchet mechanism of the type in which a pair of complementar longitudinally-slidable contacting pawls are e'mployed'to coact with a ratchet, the object of the invention being to produce a simple, convenient and reliable mechanism of the character de parts as will be hereinafter described and pointed out in the claims- In carrying out my invention as herein shown, I. employ a pawl operating ring? 11- located for oscillatory movement in a transverseslot 12 formed in the ratchet-sleeve 13 ofthe housing 14, into which the slot also extends for a short distance, as clearly shown in Figs. -'5 and 6. The said ring 11 is 5 positioned by and turns upon a ratchet'15 located within the sleeve 13'which is intergral with the housing 14 and stands at a right angle to'the longitudinal axis thereof. The

outer edge of the ring is knurled and projects just 'enough'beyond the surface'of the. sleeve for being gripped by the user of the.

tool. That portion of the ring lying within the innerend ofthe slot 12, is formed with a segmental notch 16 adapted in length to l 7 permit the noses of a pair of complementary, longitudinally-slidable, contacting,

semicircular pawls

17 and 18 to be simultaneously engaged 'with the teeth of the ratchet, as shown in Fig. 5, these pawls be- 1 ing located ina circular bore 19 formed in and concentric with the housing. The outer end of the bore 19 receives one end of a bitbrace crank-lever 2O fastened by a transverse pin 21. Helical springs 22 interposed between the inner end of the crank-lever.

and the inner ends of the respective pawls provide forconstantly urging them into contact withthe teeth of'the' ratchet, the said springs entering holes 23 formed in the inner ends of the pawls.

For coaction with the ring 11,- the nose ends of the pawls are formed with transverse slots 21, adapting the nose ends of the pawls to straddle, as it were, the ring. The r bottom wall 25 of eachslot 24 has its'outer end inclined as at 26 and its inner end beveled as at 27. The nose end of each pawl is also beveled to form a ratcheting face 28 for coaction with the teeth of the ratchet. The end walls 29 of the notch 16 in the ring 11 coact at their extreme outer ends with the inclined faces 26 of the pawls to retire them against the tension of the helical pawl.

erative'positions, its'edge is cut away adjacent to the outer ends of the walls 29, to form detent teeth 30 which coact with the bevels 27 of the pawls, as shown in Fig. 6, to yieldingly lockthe ring, which, when so locked, can only be rotated by applying sufficient force to it to slightly compress the springs 22 and so permit the teeth 30 to ride out of engagement with the bevels 27. The

inner faces of the nose-ends of the pawls are formed with driving notches 31 coacting positively with the ratchet teeth for turning the ratchet and driving the chuck 32, carried by the chuck head 33 of the ratchet 15,

which is secured in place by ascrew 34, and a washer 35, which latter fits into a recess 36 in the upper end of the sleeve 13.

When the ring 11 is turned into its intermediate position, as shown in Fig. 5, both pawls are permitted to ride over it, as it were, into engagement with the teeth of'the ratchet,now locked positively to the cranklever 20. YVhen, however, the ring is turned in one direction orthe other, one of the pawls is retired out of engagement with the ratchet teeth, as shown in Fig. 6, in which adjustment the ratchet will be driven when the cranklever is swung in the direction of the arrow a, and idly ratchet back when'the crank-lever is swung in the direction of the arrow b.

I claim: 1. A ratchet mechanism having a housing provided with a ratchet-sleeve having a aeting with the ratchet, and an oscillatory pawloperating ring located in the said slot, positioned by and turning upon the said ratchet and coacting with the nose ends of the pawls for operating the same.

3. A ratchet mechanism having a housing provided with a ratchet-sleeve having a transverse slot, a ratchet located in the said sleeve, two longitudinally-slidable contacting pawls located in the said housing and coacting with the ratchet, and an oscillatory pawl-operating ring located in the said slot, encircling the said ratchet and formed with a notch adapted at its ends to coact with the pawls, when the ring is turned, to disengage the pawls from the ratchet and yieldingly lock them in such disengaged positions.

4. A ratchet mechanism having a housing provided with a ratchet sleeve having a transverse slot, a ratchet located in the said sleeve, two longitudinally-slidable oontacting pawls located in the said housing and having theirnose ends transversely slotted and formed with operating and locking surfaces, and a pawl-operating ring installed in the slot in the ratchet-sleeve and formed e with a notch and adapted at the ends of the saidnotch to coact with the bottom walls of the slots in the nose ends of the pawls to disengage the pawls from the ratchet and yieldingly lock them in such disengaged poan oscillatory pawl-operating ring installed in the said slot ofthe ratchet-sleeve and formed with a segmental notch the end walls of which act as stops for limiting the oscil-- latory movement of the ring and the outer ends of the said walls coacting with the slots in the nose ends of the pawls for disengaging the samefrom the ratchet and the'ring being adapted at either, end of the said notch for coactingwith the pawls foryieldingly locking them in their disengaged positions. In testimony whereof, I have signed this specification in the presence of two suba;

scribing witnesses.

EDYVIN W. BULLARD.

\Vitnesses:

ERIK S. PALMER, A. E. HODGSON.