US2742808A - Pivoted-jaw wrench having a jawclosing spring anchored in a hollow pivot - Google Patents

Description

April 24, 19 P. H. HABERLE PIVOTED-JAW WRENCH HAVING A JAW-CLOSING SPRING ANCHORED IN A HOLLOW PIVOT Filed June 23, 1955 PAUL H. HABEELE en iab e jawmin-aw WRENCH HAVING A JAW- CLOSING SPRING 'ANCHORED IN A" oLLow PIVOT.

7' 7 aul: H- Haberle, Aurora,

- Application rune-2s, 1955, Serial Nip {517,561

2; Claims. roast-H99) 'l isflin eu ion rel tes to pivoteddaw wrenches of. the t ee. whi h ratchet on. he-work and. mo e p ic to s ring. an pivo tu an therefor wh reby the law the s ilt-adj st ng; lthoughfl hes fea ures may mnloy dfw h equal'advantage for oth r purposes.-

' An important obj f this i ven on, th n, is the'provis on of, an impr ved type piv and j -a tuating sp n a mechanism tor a'rateh t wrench- Anothe object f he invention s the. provision of ai m ove spr ng nehoring p v t means for a ra ch ten h ving a piv t d j w.

' ier objec f he n t tismv is the provisi n. f

a. spring-anchoring. p ot on which a movably mounted and p v e t jaw s ructureis self-adjustin .tothework. o be t rn d. r

A still. furth r object oi he inven ion is. th provisi n in a atc et ype. wr nch of. a hollow pivot t r nclos- 1H8 s n, mean opera e y connect ng, the pivot and a X t anth r. and till f rther objec of. the invention he. provisi n, in a. pivot daiaw wrench. of a holl BilLQI. e closing a d n horiugjaiawlosing spring.

Qt er objects nd advantages. of he. invention will become more apparent fr m the f l w ng detailed dedrawiugs, in which:

, F gure. 1 is a side eleva i n of awrench embodying ieatures f the; nr sentinvention; Figure 2 is ab tom view oi'the wrenchshown in Figur .scription. taken in. connection with he accompanying 1,. andilln trates the front. or open-jaw ide. thereof;

Figure 3 is a fragmentary side elevation. of the jaw structur n op n p sition andv wi h a. cover being removed to-he'tter show the self-closing. spring, assem ly;

Figure 4. is, nenlarg tl. iragtnentary horizontal secview taken ubstan ially along the. line of figure 1.;

Figure. 5 sa view, im lar to. Figur 4, ut. showing a modified form of pivotrand-spring assembly;

F gur 6 is an enlarged plan v ew of the pivotspring .ShQwn in cross section in Figure 4, but rotated 90 clock- .w from its position h r in;

ure, 7 is an enlarged plan view of the pivot spring shown in cross section in. Figure 5,, but, ota ed. 90 clockwjs jrom its position therein;

Figut .8 is anenlarged plan viewer a pivot insert, but t late jfill clockwise from its position therein;

. I F gure9 is a left nd viewotv he insert hown in Figure 8; and

, Un d States Pfl Q v Figur 1.0. s a-plan view. having parts, broke a y an shown n; section, of the cuph pe p o p n shown in, 'ross section in Figures 4 and 5.

As shown in Figures 1 and 2, the wrench comprises an elongated handle 11 terminating atone end in a fixed orstationary' jaw 12; The jaw has an arcuate and convan shaped gripping surface #with transverse serrations on'teeth 13; These teeth maybe-provid'ed as an integral part ofthe: wrench in'whichevent thehandle is formed from an alloy steel or other hard, tough" metal 2,742,808 Patented Apr. 24, 1956 to provide maximum wear. However, the teeth may be formed on adetachable member secured to the handle by'interengaging Wedge cleats, by screws, or by any one of several other means, all of which is well known in he art.- r

" It will be noted that the longitudinal axis of the handle 11 is forwardly offset relative to the stationary jaw and connected thereto by a curved portion 14 for a purpose to be described later.

As best shown in Figures 4 and 5, the stationary jaw 12 has an opening 15 therethrough for receiving a pivot member 16. The pivot member, illustrated in Figure 10, has a straight cylindrical shank 17 with an. enlarged end portion 18 providing an abutment shoulder 19. Serrations or teeth 20, 20. are formed in the shank adjacent the abutment shoulder. ,The shank is sized for press fit, through they opening 15 withthe shoulder 19 seated r ayhe body of the movable jaw generally is S-shaped in sidevi'ew. .At its forward end is a gripping portion 26,

' preferably of straight line configuration arranged in angu- Iar ortiltedrelation to the vertical axis of the stationary I jaw when the "parts are' as shown, in Figure l. The gripping surface is formed by transverse serrations or teeth, 27. As in the case of the teeth of the stationary jaw, the teeth 27 may be formed integrallyon the'movable jaw or on a detachable member.

At the other or opposite end of the movable jaw body isprovided a thumb trigger 2.8. The trigger has a concave upper surface to accommodate the. thumb of a user for quickly opening the movable jaw relative to the fixed or stationary jaw for receiving therebetween a work piece to be turned, When the movable jaw is rotated on the pivot 17' to the positionof maximumv opening (Figure 3),

the convex under side of the thumb trigger seats against 45 t the curved surface. 14, connecting the stationary jaw and handle... I v

in order that themovable jaw 21 be self-adjusting toward the stationary jaw 12 to accommodate awork piece and effectively grip it, a coiledwire spring 29 is confined within an internal recess 30 in the pivot member. An, extension recess 31, of smaller diameter than the recess-30, is provided with threads 32 for securing, one end 33 of, the spring. As best shown. in Figures 4 and 6, theispring 29 has several, coils of wire at the end 33 wound in a right-hand direction. The coils are sized to thread into the extension recess and lock in the pivot member. At the other end 34 of, the spring there is provided a plurality of coils wound in a left-hand direction.

Theleft and right-hand. coils are joined by a loop 35.

@The coils 34' terminate in a diametrically extending. an-

chor 36 which, extends into a slot 37 provided in an I edge of the aperture 25 of the movable jaw boss 22. Thespring described is provided with right-hand-wound coils in order to threadably engage within the threaded recess at' the bottom of the pivot, member. This arrangementafiectsa locking of the parts. In Figure 6, the spring is illustrated as having two such coils. It is to be "understood; however, that this number may be varied depending on the depth of the recess 31 and the number of threads therein. The forward or working end 34 of the'spring is provided with a plurality Of'lfiftrhflfldrWOl-llld coils. wherebyl to effect a. winding ofthat portion ofthe 3. spring when the movable jaw is rotated to an opened position, An unwinding of the spring will, therefore, effect pressure in a jaw-closing direction.

As seen in Figure 4, the pivot mount 22 has an annular recess 38 provided in the face diereof. A fiat cover plate 39 is shaped to be spun or pressed into the annular recess to serve as a seal for the interior of the pivot member and to confine the coiled spring therein. It is preferred that the closed end of the pivot member lie flush with the outer face of the movable jaw pivot mount 21 and that the annular recess 38 accommodate the cover plate fiush with the outer face of the pivot mount 22.

With the arrangement of parts as described above, the spring 29 will normally urge the movable jaw 21 toward the stationary jaw 12 from any limits defined by the abutment of the trigger 28 and curved handle surface 14 (Figure 3) and by contact of the jaws one with the other. The user can open the movable jaw by exerting thumb pressure on the trigger 28 to rotate the jaw in a clockwise direction relative to the stationary jaw to any desired distance within the above defined limits. In this relative jaw movement, the pivot mounts 21 and 22 rotate on the pivot member 16 against pressure exerted by the coiled spring 29 urging the movable jaw to a closed position.

In the modified embodiment illustrated in Figures 7, 8 and 9, the structural features previously described are embodied therein except for changes in the construction of a coiled wire spring 29:: and the provision of an insert 40 for the extension recess 31 of the pivot member 16. The insert 46 has a body 41 of approximately the same length as the depth of the extension recess 31 and is provided with exterior threads 42 for threaded engagement therein. At one end of the body 41 is formed forwardly extending spaced fingers 43 and 44 of generally partially circular configuration.

The spring 29a has all of its coils 45 wound in a lefthand direction with the inside diameter thereof effecting a snug embracing of the spaced fingers 43 and 44. The

embracing end of the spring terminates in a diametrically 1 extending anchor 46 which engages in a slot 47 between the fingers 43 and 44. At the other end of the spring is a diametrically extending anchor 48 shaped similarly to and for the same purpose as the anchor 36 of the spring 29.

Operation of the spring 29:: and associated parts is the same as previously described. As the end 46 is anchored in the pivot member, a clockwise rotation of the movable jaw 21 winds the spring thereby effecting the application of an unwinding pressure on the jaw to return it to a position closing it either against an inserted work piece or the stationary jaw.

While I have shown certain preferred embodiments of my invention and described them more or less precisely as to details, it is to be understood that the invention is not to be limited thereby, as changes may be made in the arrangement and proportion of parts, and equivalents may be substituted, without departing from the function and scope of the invention.

1 claim as my invention:

l. In a hand tool having a fixed jaw and a movable jaw with furcated pivot mounts straddling said fixed jaw, the improvements comprising a hollow pivot member, said fixed jaw and pivot mounts having aligned openings for receiving said pivot member, a coiled spring adapted to seat within said pivot member, and means anchoring one end of said spring in the pivot member, the other end of said spring being anchored to one of the pivot mounts for normally urging said movable jaw toward said fixed jaw. v

2. In a hand tool having a fixed jaw and a movable jaw with furcated pivot mounts straddling said fixed jaw, the improvements comprising a hollow pivot member, said fixed jaw and pivot mounts having aligned openings for receiving said pivot member, a coiled spring adapted to 4 seat within said pivot member, and threaded means anshoring one end of said spring in the pivot member, the other end of said spring being anchored to one of the pivot mounts for normally urging said movable jaw toward said fixed jaw.

3. In a hand tool having a fixed jaw and a movable jaw with furcated pivot mounts straddling said fixed jaw and said jaws having aligned openings at the straddled area, the improvements comprising a recessed pivot memoer press-fitted in the opening of the fixed jaw and extending on both sides thereof for rotatably mounting the furcated mounts of the movable jaw, a coiled spring adapted to seat in the recess of said pivot member, and threaded means in the recess of said pivot member for anchoring the coiled spring therein, the other end of said spring being anchored to one of the pivot mounts for normally urging said movable jaw toward said fixed jaw.

4. In a hand tool having a fixed jaw and a movable jaw with furcated pivot mounts straddling said fixed jaw and said jaws having aligned openings at the straddled area, the improvements comprising a recessed pivot member with a serrated peripheral portion located substantially intermediately of the ends thereof, the pivot member bcing arranged for press-fit at the serrated portion in the opening of the fixed jaw with the ends thereof rotatably mounting the furcated mounts, the bottom of the recessed portion of the pivot member being threaded, and a coiled spring having one end arranged for threaded engagement in said bottom of the recess to anchor the spring to said pivot member and its other end anchored to one of the pivot mounts for normally urging said movable jaw toward said fixed jaw. Y

5. In a hand tool having a fixed jaw and a movable jaw with furcated pivot mounts straddling said fixed jaw and said jaws having aligned openings at the straddled area, the improvements comprising an axially recessed pivot member in press-fit engagement in the opening of the fixed jaw and extending beyond bothsidcs thereof to provide pivots for rotatably mounting the straddling furcated mounts, threads in a bottom portion of the axial recess of the pivot member, and a coiled spring having coils at one end arranged for threaded engagement in the threads of the bottom portion of the pivot-member recess to anchor the spring therein, the coils at the other end of said spring being wound in a direction opposite the winding of the coils at said one end and terminating in an anchor to one of the pivot mounts for normally urging said movable jaw toward said fixed jaw.

6. In a hand tool having a fixed jaw and a movable jaw with furcated pivot mounts straddling said fixed jaw and said jaws having aligned openings at the straddled area, the improvements comprising an axially recessed pivot member in press-fit engagement in the opening of the fixed jaw and extending beyond both sides thereof to provide pivots for rotatably mounting the straddling furcated mounts, threads in a bottom portion of the axial recess of the pivot member, and a coiled spring having the coils at one end wound in a left hand direction and the coils at the other end wound in a right hand direction with a connecting loop therebetween, the right hand coils being threaded into the threads of the bottom portion of the recess in the pivot member to anchor the spring therein, the left hand coils terminating in an anchor to one of the pivot mounts for normally urging said movable jaw toward said fixed jaw.

7. In a hand tool having a fixed jaw and a movable jaw with furcated pivot mounts straddling said fixed jaw and said jaws having aligned openings at the straddled area, the improvements comprising an axially recessed pivot member in press-fit engagement in the opening of the fixed jaw and extending beyond both sides thereof to provide pivots for rotatably mounting the straddling furcated mounts, threads in a bottom portion of the axial recess of the pivot member, a threaded insert member screwed into the threaded bottom portion of the axial recess of the pivot member, and a coiled spring having one'end anchored in said insert member and its other end anchored in one of the pivot mounts for normally urging said movabale jaw toward said fixed jaw.

8. In a hand tool having a fixed jaw and a movable jaw with furcated pivot mounts straddling said fixed jaw and said jawshaving aligned openings at the straddled area, the improvements comprising an axially re- .cessed pivot member in press-fit engagement in the opening of the fixed jaw and extending beyond both sides thereof to provide pivots for rotatably mounting the straddling fureated mounts, threads in a bottom portion of the axial recess'of the pivot member, an insert member having .a threaded body screwed into the threaded 15 2,645,145

the other end anchored in one of the pivot mounts for normally urging said movable jaw toward said fixed jaw.

References Cited in the file of this patent UNITED STATES PATENTS 295,204 Schramm et al Mar. 18, 1884 1 ,486,981 Magnan Mar. 18, 1924 2,211,507 Lilleberg Aug. 13, 1940 Larson July 14, 1953

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