US1313345A - A cokpob-ation of - Google Patents

Description

E. 0. SMITH. MACHINE FOR FORMING WRENCH HEADS.

APPLICATION FILED JULY 28| I917.

Patented Aug. 19, 1919.

4 SHEETS-SHEET 1.

uni CULUMNIA mmrmmpn o)" wAsmmn'p n. c.

4 SHEETS-SHEET 2.

Patented Aug. 19, 1919.

v wuemtoz THE COLUMBIA PLANOunAPu c0., WASHINGTON, n. c.

E. C1 SMFTH.

MACHINE FOR FORMING WRENCH HEADS.

APPLICATION FILED JULY 28. 1911.

1,313,345. Patented Aug. 19, 1919.

4 SHEETSSHEET 3.

THE COLUMBIA PLANOGRAPH 110.. WASHINGTON, n. c.

E. C.'SMITH.

MACHINE FOR FORMING WRENCH HEADS.

APPLICATION FILED IULY'ZB. I917.

1,3 1 3, 34:5 Patented Aug. 19, 1919.

4 SHEETS-SHEET 4.

UNITED STATES PATENT OFFICE.

EDwAnne. SMITH, or MEADVILLE, PENNSYLVANIA, AssIeNJon. 'ro nnnnvrnnn WRENCH COMPANY, or MEADVIELE, PENNSYLVANIA, A: coaeronerro or PENN SYLVANIA.,

MACHINE FOR FORMING wRENCIT-HEADS.

Specification of Letters Patent. at nt 0 19,1919,

forming wrench heads consists in certain improvements 1n the construetron thereof as will he hereinafter fully deserihed and pointed out'in the claims.

The movahl'e of a wrenchas hereto fore" formed has required some =inachining; In the present invention this isvery' largely, if not entirely, obviated;

The wrench head is formed ina forging machine which isillustrated in the: accompanying drawings as follows:

Figure 1' shows a plan view ofsucha machine.

Fig. 2 a plan View of the preliminary forging of a wrench head.

Fig. 3 a side elevation of the same.

Fig. 4 an end View o'fthe same.

Fig. 5 a: view of one of the dies for the preliminary forging operation of the wrench head.

Fig. 6 a plan view of such dies:

Fig. 7 a plan view of the completed Wrench head.

Fig. 8 a side elevation of the same;-

Fig. 9 an end View of the wrench" headi Fig. 10 a sideelevation of one of the finishi'ng dies. a

Fig. '11 a planview, partly ln s'ection, of the finishing dies;

Fig. 12 a side elevation ofsard dies.

The forging machineis one of ordinary construction. It hasthe framed in which is a surrounding web 2. -'A longitudinal web also provided. driving shaft 4 is mounted in bearingsh. A crank is arranged on the drive shaft 4 and connected by a pitman 7 with a cross head 8, the cross head operatingin guides 9 formed hy the webs 2 and 3. This cross head is designed to operate a punch.

A plunger 10 reclprocates 1n guides formed by the webs 2 and 8. Cams 11 and 12 are fixed on the drive shaft 4. and o erate against the rollers 13 and 14 on the p unger 10. The cams are shaped to give the plunger reciprocating movement danced with relation to the crank 6. A plnnger 15'is carried by guld'es 16 ln-the wehs 2 and 3 and is intended to exert,-sidewisepressure-on the dies. The

plunger 15 is actuated by a toggle lever na de up otEthe-links'fl and IE8, the linksice-- rng connected to the plunger .15 and the link IS -heing piwotahy mounted onapin I9 on the frame.- A l ink' 20 is connected-with: the

link 18 1051 a pin 21 forms alii nk -in a; second toggle lever with a link 22*, the link being mou-nterl on a pin 23 carried by the plunger 10. A yieldingdevice is arrangeds connection with the'toggle levers 20 and I 22, the link22' having-an arm 2% from which a link-Qhiextends. Afn arln 26=is pivotally connected with the link 25*, the 261ccing earriedi'by: azpin fi'fi on theplunger. .An

am: 2'8 extends 'i rom' the pin 27 and alink QQeXtend-s throughthe frame of the :ma chine- A spring 30- exerts pressure on the link 29; thnsforminga devicefon permitting a. yiel'ding'action onfthezplunger 15. These parts so :as descrihedi are found in, ond'inary forgingnia'chin'esr and may be varied; to suit convenience.

In. the initial" forging operation side dies 31% are used. These dies :have: central faces SQtwhichv engage the sides of the neck33' bei tween th'ei jaw and: guide piece of the head. The. dies/also: haveithei pockets or depressions 3-1 andi3'5iforthe guide ringand: jaw. These 311761 formed: in. opposing facesofthe' side dies sorthat. when a hands placed between the faces- 32and. the side dies are brought together" the ?bar; is clamped by the side piecest32z.

'Ehe endfdiiefio: carried? the plunger 8 hasiaidie section 37 fitting; the socket 35rand a lsoxai shoulder 3'81 which engages the ends of the: sliding! blocks 38*? forming: parts of; the dies. Astithe plunger 36'v advancesit first upsetsthedieadltl in the pocket35... When the-shoulder 38 engages the blocks 38 it forces these: bliocks tot'thezrea'r'. upsetting the bar and forming a guide ring 42 in the pocket 'I he= sliding hlecks- 88 -are1an ranged on bolts 39 (see dotted lines Fig. 6)

and springs 40 (see dotted lines) return them as the plunger 36 is Withdrawn. A portion of the punching is also preferably accomplished in this operation, an opening 43 being formed by a, punch 44; on the end of the die 37. This preliminary forging is placed in the finishing dies shown in Figs.

10, 11 and 12. Thefinishing dies and.

46 areplaced in the forging machine and are subjected to the side thrust of the plunger 15. The dies have the pockets 47 and 48 which receive and finish the jaw 4l andtheguide ring 42 respectively- An end plate 49 is secured to the die 46 and has an opening 50 through which the punch 44 operates. 'The rear end of the die 45 overlaps at 51- the plunger 8. The punch is of the shape of the opening 55.

In the operation of the machine the blank as originally forged is placed in the finish ing dies, the dies brought together, clamping the plank in place and finishing the forming of the jaw and guide ring. The overlap 51 cuts off the surplus metal. The punch is then advanced and forms the guide opening-in the head; The punch as it advances takes: the metal between the faces of the i dies, the punch passing along the groove 54 and this grooveforms a. guide for the punch. 'The punch passes' through "the pocket 48 and through the opening 52. At the completion of the operation the head is formed having a jaw 41, the guide ring 42 and the connecting bars 33 and 33 the metal being entirelyremoved between the bars 33 and 33* by the action of the punch. In this way the'head is practically finished in a forging operation and the jaw has' a double connection with the guide ring. The important feature ofithe invention is the bringing of the faces of the dies directly into contact or in line with the cutting edge of the punch so that all the metal the punch has to remove are the innersurfaces of the connecting bars 33 and 33*. Furthermore the side dies are in a depression so that the rear face ofthe jaw has a shoulder which rests against the edge of the die and thus supports the metal of the jaw as the punch advances. The result is thatthe face of the jaw is not distorted by theaction of the punch and the finishd jaw can be so accurately finished in the forging machine as to reqrure no machmlng as to the guide opening for connecting bars 33* and 33 or the face of the jaw.

WVhat is claimed as'new is 1. In a machine for forming wrench heads the combination of side dies forming a reduced space between sockets for the jaw and die ring of a wrench head; and a punch operable between the side dies to remove material between said dies extending through the jaw and guide ringand between said dies to form a guide opening.

2. In a machine for forming wrench heads, the combination of side dies forming a reduced space between sockets for the jaw and die ring of a wrench head; and a punch operable between the side dies to remove material through the jaw and guide ring and extending entirely across the reduced space between the dies to form a guide opening. j

3. In 'a machine for forming wrench heads, the combination of side dies forming a reduced space between sockets for the jaw and die ring of a wrench head; and a punch i operable between the side dies to remove material between said dies through the jaw and guide ring and between said dies to form a guide opening, the dies forming a guide for the punch as it advances from the jaw to the guide ring.

4. In a machine for forming wrench heads, the combination of side dies forming a reduced space between sockets for the jaw and guide ring of a wrench head, said dies having grooved faces; and a punch operaable-between the side dies to remove the material between the dies to form a guide opening, said punch moving along the groove and the groove forming a guide for the punch. 5. In a machine for forming wrench heads, the combination of side dies having pockets shaped to conform to the wrench head and guide ring and an intervening narrower'space forthe neck between the jaw and guide ring; a punch operable between the side dies, said punch extending entirely across the space between the side dies at the neck; and 'means for forcing the punch through the jaw socket, space between the side dies corresponding to the neck, and the guide ring socket.

In testimony whereof I have hereunto set my hand.

"EDWARD C. SMITH.

Copies of this patent may be obtained for live cents each, by addressing the Commissioner of Patents,

7 Washington, D. 0. c j

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