US977691A - Tap-wrench. - Google Patents

Description

c. E. WILLIAMS." TAP WRENCH. APPLICATION FILED JUNE 3,

Patented Dec. 6, 1910.

L w M RM i a T A S PAT'T FFifiE CHARLES E. WILLIAMS, OF MANSFIELD, MASSACHUSETTS, ASSIGNOR TO BAY STATE TAP AND DIE COMPANY, OF MANSFIELD, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

TAP-WRENCH.

Specification of Letters Patent.

Application filed June 3, 1910. Serial No. 564,750. 1

To all whom it may concern:

Be it known that I, CHARLES E. VVIL- LIAMS, a citizen of the United States, residing at Mansfield, in the county of Bristol and State of Massachusetts, have invented a certain new and useful Improvement in Tap renches, of which the following is a specification, reference being had therein to the accompanying drawings.

Tap wrenches as usually made are formed with two jaws mounted in a head or case, one jaw of which at least is movable longitudinally toward and from the other jaw within the head or case, said other j aw usually being stationary. The movable j aw is usually provided witha screw-threaded shank which is screwed into a tapped outsocket in a handle, the socket end of said handle being threaded on its exterior periphery by a thread running in the opposite direction from the interior thread of the socket, said exterior thread engaging with a tapped out tubular connection with the interior of the head so that by turning the handle, it will reciprocate the said movable jaw in or out as desired according to the way the handle is turneol. It

' is important that in moving the jaw in or out, the jaw should not be turned on its axis. It is also necessary that there should be an opening in both sides of the head to the chamber in which the jaws are mounted in order to permit inserting the work between the mouths of the jaws. Sometimes heretofore the head'has been made cylindrical, and the chamber within the head has also been made'cylindrical, the sides of the jaws being curved on the arc of a circle corresponding with the cross-sectional curve of the chamber of the head, and in such case, when the handle is turned to move the jaw in or; out, the jaw would also rotate with it unless some special means were used to prevent the jaw from turning. Heretofore, when a cylindrical form of head is employed as above described, a common method has been to insert a pin or screw through the side of the I head which engages with a longitudinal slot One object of the present invention is to provide such a construction as will enable the use of fiat faced jaws with convex edges in combination with a fiat faced head having a rectangular work-opening for convenience of getting the wrench down to the work and formed with a chamber to inclose the shank and threaded connections of the movable jaw to protect them from grit and dirt, and having concave guide-ways for the convex sides of the jaws, the fiat walls of the chamber engaging the flat faces of the jaw so that the jaw is prevented from turning during its forward and back movement without necessitating the use of pins or screws, the concave ways forming side supports for the jaws.

The invention will be fully understood from the following description taken in connection with the accompanying drawings,

and the novel features are pointed out and clearly defined in the claims at the close of the specification.

In the drawings,-Figure 1 is a plan of a wrench embodying the invention. Fig. 2 is a plan, similar to Fig. 1, partly in section, the ends of the handles being partly broken away. Fig. 3 is a side elevation of a wrench embodying the invention. Fig. 4 is a longi tudinal section on line 44 of Fig. 1. Fig. 5 is a cross-section on line 55 of Fig. 1. Fig. 6 isa plan of the blank from which the head is formed. Fig. 7 is a side elevation of the head shown in Fig. 6. Fig. 8 is a section on line 88 of Fig. 6.

Referring now to the drawings,1 represents the head of the wrench having the two opposite end tubular necks 2, 3, the neck 2 being internally screw-threaded to receive the threaded end of the handle member 4 whose inner end forms a stop against which abuts the rear end of the fixed jaw 6. The

Patented Dec. 6, 1910..

neck 3 is-tapped out to receive thethreaded end 7 of the handle 8 which operates the movable j aw. 9, said movable jaw being formed with a threaded end 101 which screws into the internally threaded end of the halidle S, the internal thread of the handle 8 being in the reverse direction from the exterior threaded portion]. By rotating the handle the movable'jaw is moved toward 10 or from the fixed jaw as desired. The particular construction or method of connection between ethezhandle and the movable jaw, however, is ,not a part of the presentinvention.andwmay-be varied. The two jaws 6,=9, are fiaton.their top;and bottom faces .and are formed with convexopposite side edges 10,. 10, which fit in concave grooves. 11, 11, in the sides of :thehead 1. The topand bottom-portionslQ, l2, of; the head tare fiat both on their exterior and on their interior faces, :theinterior faces fitting closely to the-fiatted faces of; the;jaws as close as is consistent with not impeding the in and out sliding'movement oft-the; aw. i Through these top and bottom sides 12 ofthe head-are rectangular openings, 13 .rfor :gaining access to the aws. The, top and bottom walls of .the chamber ;of thenhead lare preferably quite; thin, and dip inward toward the mid- 30, dle, as shown in Fig.4 in order that the faces of the, jaws-at their-working ends may be: flush with .or p1'oject-..slightly -outside of the ,work-opening. The cylindrical necks spread: and flatten .to form .rthev..head.,intermediate the neckstand; form achamber 15 within which:thethreaded,end 101 of the shank of themovablejaw 9.is always inclosed,whetl ierin its forwardorsbaclc posi-- tion. ,This chamber is clearly ,1 shown in; 40 Fig. 4;. j 'llhefiattedportions .l6uat the ends of j the worlcopening l3 engagewith some part: .of the. flattened face of the jaw during. the entire forward and backnmovement. of the 45. j aw .and. thus ,preventrotation of. the jaw during the forward and back feeding .movement. This closefit also prevents any. dirt ,or grit getting into the chamber, and thereby coming-into contactwiththe threaded shank of the jaw.

One feature ofv the invention relates to. the method. of constructingthe .wrench above described. ;If the head vwas in the :first instanceformed witlra ,flatted top..and,bot-

tom,,it would..be exceedingly.diflicult, -if not, impossible, to, form the concave grooves 11 which-. it is desira,ble to. obtain because of the flat walled chamber intermediatethe cylindrically bored necksiand the arc. shaped ways ;in. the. jaws which prevents insertion of any tool to bore out the curved. grooves. ,In practical construction, therefore, it is necessary .to. .h ave the said intermediate. chamber made in the first place cylindricalzsothat the cylindrical bore extends..thror 1gh both mediate chamber. solid, with the transverse work-openingand then drilled out lengthwise. A blankof such form after being bored orldrilled out is shown in Figs. 6, 7 and 8, in which the necks 2, 3, are each formed with tubular portions l 7, 18, extending inwardly in continuation of the necks as far as the ends of the rectangular opening 13, the solid blank being drilled or bored from end to end forming the tubular passage through the necks 2, 3, and through the cylindrical projections 17,18, .and' forming the concave grooves in thesides ofthe connected portion 19 corresponding. with. the concave grooves 11' in the sides of the headl; then a former is inserted into the head, said formerbeing of a size and shape corresponding with the two jaws combined, and the blank is subjected to pressure to-fiatten down the'rounded portions 17, 18, against the former into the thin ifia-ttened form of the completed wrenchv al-.

ready described, after which theformer is withdrawn.

that I claim is:

1. Atap wrench having aws which are formed 1 with flatted faces. and with .side edges convexly curved-i in 'crosssection, one

. fsaid jaws being-movable and having a threaded end, a head formed witha tubular cylindrical neck,at each. end, one of which .recives thethreaded end of thefmovable jaw,

said head having a transverse work-opening and concave grooves in the sldes thereof to .form ways for the aws, said head .havmga e'fiat walled. chamber: between the ends of said .work-opening and the cylindrical .neck, isaid chamberbeingformed at ts: innerend to correspond in .ClOSSfSBClSlQl] al contour with the cross-sectionalcontour of the jaws, and covering the rear-endsof the jaws.

2. A tap wrenchhaving ahead formed with a transverse work-opening and concave ways for the jaws in thesides ofsa-idhead, in combination -with jaws -having convex sides iwhichyfit insaid concave ways, said aheadand said jaws all having two flat faces.

. 8. A tap wrench having a; head "formed with a chamber; for the jaws and having a transverse: work-opening through the side walls of the chamber, said head having concave'grooves in the :oppositesides of the ,j awchamber to form ways for the jaws, said head having a non-cylindrical chamber between .the said work-,opening-and the neck connecting therewith.

4. Atap wrench;.having a head formed with achamber. for the jaws and having a transverse .work-,openingthrough the side .walls .of the chamber, said head having concave ,groovesin thenoppositesides of the .jaw-chamber to form ways for the jaws, said {head having a non-cylindrical chamber between the saidiworkwopening and the cylindrical neck connecting therewith, the walls of said chamber having two flat faces which prevent the jaws from rotating.

5. A tap wrench having a head formed with a chamber for the jaws and having a transverse work-opening through the side walls of the chamber, said head having concave grooves in the opposite sides of the jaw-chamber to form ways for the aws, a tubular cylindrical neck at each end of the head, said head having a non-cylindrical chamber between the end of said work-opening and the cylindrical neck connecting therewith the walls of said chamber having two flat faces which prevent the jaws from rotating, in combination with two jaws fitted in said grooved ways, one of said jaws being slidable longitudinally therein, and having a. threaded end which extends into one of said tubular necks, and means connected with said movable jaw whereby the said movable jaw may be moved longitudinally.

6. A tap wrench having a head formed with a chamber for the jaws and having a transverse work-opening through the side walls of the chamber, said head having concaved grooves in the opposite sides of the JtLW ClHUDbGI to form ways for the aws, a

tubular cylindrical neck at each end of the head, said head having a non-cylindrical chamber between the end of said work-opening and the cylindrical neck connecting therewith, the walls of said chamber having two flat faces which overlap the rear ends of the jaws, in combination with two aws fitted in said grooved ways, one of which is slidable longitudinally therein and extends into one of said tubular necks, a handle having connection with said jaw whereby said movable jaw may be moved longitudinally by rotating said handle, said flatted walls of the jaw-chamber engaging the said movable jaw to prevent its rotation while the handle is being rotated.

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

CHARLES E. WILLIAIVIS.

\Vitnesses L. LESLIE J ONES, CHARLES C. HAGERTY.

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