US890492A - Machine for making nut-locking keys. - Google Patents

Description

PATENTBD JUNE 9, 1908.

N o 92 89 .4 I J; H. BURRows.

MACHINE F09 MAKING NUT LocKING KEYS.

APPLICATION FILED 'SEPI'. 13. 1907.

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PATENIED JUNE 9, 1908. MACHINE FOR MAKING NUT LOCKING KEYS.

v APPLICATION FILED SEPT. 13. 1907.

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MACHINE FOR MAKING NUT LOCKING KEYS.

APPLICATION FILED BBPT.13. 1907. 3 BEEETS SHEBT 3l UNITED sTATEs PATENT oEErcE JOSEPH H. BURROWS, OF BROCKTON, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO L. F.

GARFIELD, OF BROOKTON, MASSACHUSETTS.

Specification of Letters Patent.

Patented June 9, 1908.

Application filed September 13, 1907. Serial No. 392,676.

To all whom it may concern:

Be it known that I, JosEPn H. BUEEows, of Brockton, in the county of Plymouth and State of Massachusetts, have invented certain new and useful Improvements in Machines for Making Nut-Locking Keys, of which the following is a specification.

This invention has for its object to provide a machine for making keys adapted to be inserted in slots in internally-threaded nuts, the nut having a slot which opens into the bolt hole, and the key being formed to enter the slot, and to rock on the bottom thereof, the inner end and upper edge of the key being beveled to form a sharp cutting inner end adapted to indent the thread of a bolt with which the nut is engaged, and a relatively thin or reduced upper edge having beveled sides adapted to conform to lips formed on the sides of the slot by upsetting the metal of the nut at opposite sides of the slot. When the key is inserted in a nut, it is adapted to be tipped on the bottom of the slot, so that its cutting edge may stand outside the bolt hole prior to the application of the nut to the bolt, and may be forced into the bolt hole to indent the thread of the nut, and prevent the rotation of the latter after it has been screwed to place on the bolt.

The invention consists in the improvements hereinafter described in an organized machine adapted to rapidly and economically manufacture keys for the purpose above indicated. l

Of theaccompanying drawings, forming a part of this specification,-Figure1 represents a sectional elevation of a machine embodying my invention. Fig. 2 represents a sectional view of the shearing die which forms the cutting edge of the key. Figs. 3, 4, 5, 5a represent different views of a completed key constructed by my improved machine. Fig. 6 represents a transverse section through a portion of the machine, and elevations of other parts hereinafter referred to. Figs. 7, 8, 9, 10 and 11 represent fragmentary views illustrating diiferent parts of the key-forming operation. Fig. 12 represents a top plan view of a portion of the machine, certain parts being shown in section. Fig. 13 represents a section online 13 of Fig. 12. Figs. 14 and 15 represent views of parts of the machine hereinafter referered to.

The same letters of reference indicate the same parts in all the figures.

In the drawings, 12 represents the bed of the machine, on which are mounted standards 13 supporting a driving shaft 15, and having guides for a reciprocating cross head 16, which is connected by links or rods 17 with cranks on the crank shaft, the cross head being reciprocated toward and from the bed. Mounted on the bed is a guide 18 for the strip 19, from which the keys 20 are cut, said guide havingfacings 21 of felt or other suitable material for cleaning the sides of the strip. 22 22 represent feed rolls which engage the sides of the strip and feed it forward step by step to a point between a male punching die 23 and a female punching die 24. Said dies are formed to sever the keys 2() from the strip, each key having a teat 25 at its lower portion and inclined faces 26 and 27 at opposite sides of the teat. Means hereinafter described are employed for forming beveled faces 28 28 on the upper edge of each strip, and for forming beveled faces 29 29 on the outer end of the strip, said beveled faces meeting to form an acute-angled cutting edge adapted to indent the threads of a bolt. The beveled faces 28, however, do not meet, but simply reduce the thickness of the upper edge -of the key, and conform to lips which are formed by upsetting the metal of the nut at opposite sides of the mouth of the slot, said lips overhanging the beveled faces V28 and preventing the key from leaving the slot. The beveled faces 28 are formed by a pair of dies 30, which are pivoted at 31 to a holder or carrier axed to the cross head 16, and are arranged so that their lower ends meet, said lower ends being yieldingly pressed together by springs 32. W'hen the cross head descends, the dies 30 strike the upper edge of the strip 19, and remove therefrom enough material to form the beveled faces 28. The dies 30 have short inclined faces 33, the outer ends of which strike the upper edge of the strip while the dies are descending, and act to shear away ortions of the material of the strip. As t ie dies descend, they separate and move downwardly along the sides of the strip 19, as shown in Figs. 8 and 9. The dies 30 are arranged at some distance from the point where the punching dies act on the strip so that a plurality of series of beveled faces 28 are formed on the strip, as indicated in Fig. 11. The feed movements of the strip are so timed that a pair of the beveled faces 28 are brought by each feed into alinement with the punching dies, so that the key cut from the strip by the punching dies includes two of the beveled faces 28 positioned on the key as shown in Fig. 5. The advancing end of the strip is acted upon before the key is severed, by a vertically-reciprocating die 34, the form of which in cross section is shown in Fig. 2, said die having a V-shaped recess which intersects the lower end of the die, and forms a V-shaped cutting edge adapted to form the beveled faces 29 which constitute the cutting end of the key. The dies 30 and 34 are adjustably mounted on a carrier 57 affixed to the cross head. The portion of the strip 19 which is acted on by the beveling dies 30 and 34 and the punching dies 23 and 24, is supported by a guide 58 which is grooved to form a track and a lateral support for the strip, said guide having a raised portion 59 (Fig. 1), one edge of which has a recess 6() which fits one side of the male punching die, said raised portion extending across one side of the strip 19. 61 represents a finger attached to the carrier 57, and arranged to bear on the opposite side of the strip 19 from that which bears on the raised portion of the guide 59, said finger supporting the strip against the thrust of the male punching die.

The punching dies 23 and 24 are reciprocated simultaneously in opposite directions so that they approach the strip from opposite sides, the male punching die passing through the strip and entering the female punching die, forcing the attached key into the latter. Means for reciprocating the punching dies, as here shown, include bell crank levers 37 pivoted at 36 to the frame of the machine, the longer arms of said levers having slots 38 which are slidable on pivotal blocks 39 carried by the cross head 16. The shorter arms of the levers 37 enter recesses in the holders or carriers 40 which support the punching dies 23 and 24, said carriers being movable in guides 41 on the bed of the mach'ine. The feed rolls 22 which feed the strip forward, are intermittently operated by means of a ratchet 42 affixed to the shaft 54 of one of the feed rolls, an arm 43 mounted to oscillate on said shaft, and provided with a vdog 44 engaging the ratchet, and a lever 45 pivoted at 46 to the frame of the machine, and having a slot 47 in one arm engaging the arm 43, its other arm having a trundle roll 48 which engages a cam 49 on the driving shaft 15. A spring 53 acting on the lower end of the lever 45, holds the trundle roll 48 in engagement with the cam 49. The rotation of the driving shaft oscillates the lever 45 and arm 43, and thus causes an intermittent rotation of the ratchet 42 and thefeed roll attached thereto, the two feed rolls being connected by gears so that they rotate simultaneously in opposite directions.

The operation is as follows: After each feed movement of the strip, which is accomplished while the cross head is raised, the cross head descends, causing the dies 3() to form the beveled faces 28 on the upper edge of the strip, and at the same time causing the die 34 to descend across the advancing end of the strip, and form the beveled faces 29 thereon, the die 34 at the same time removing a chip or waste portion 50 (Fig. 11). After the cross head rises, and before the next feed movement of the strip, the punching dies act to sever a key from the strip, the key having the form shown in Figs. 3, 4 and 5. The keys as fast as they are formed, are forced into the female die 24 and through a channel 51 (Fig. 13) extending backwardly from said die, the keys falling one by one through an outlet 52 in the bed of the machine.

It Will be seen that the key as punched from the strip, includes the sharpened indenting edge formed by the die 34 and two of the beveled faces formed by the dies 30. It will also be seen that the movement of the dies 30 and 34 across the path of the strip is edgewise of the strip, while the movement of the punching dies is crosswise of the strip.

My invention is not limited to the specific construction here shown, and the same may be modified in various ways without departing from the spirit of the invention. For example, the punching dies may be formed to punch out a key 20, which instead of having a teat 25 has a recess 250 adapted to engage and rock on a corresponding projection formed on'the bottom of the slot in the nut.

I claim:

1. A machine of the character stated, comprising a strip guide, means for intermittently feeding a strip along the guide, a sharpening die movable across the path of the strip, edgewise of the latter, and adapted to sever a waste piece from the forward end of the strip, and thereby sharpen said end, and means for punching a key from the sharpened end portion of the strip.

2. A machine of the character stated, comprising a strip guide, means for intermittently feeding a strip along the guide, a sharpening die movable across the path of the strip edgewise of the latter, and adapted to sever a waste piece from the advancing end of the strip, and thereby sharpen the forward end of the strip, cooperating punching dies movable across the path of the strip crosswise of the latter, and adapted to sever a key from the sharpened end portion of the strip, and mechanism for successively operating the sharpening die and punching dies.

3. In combination, a strip support and guide, means for feeding a strip intermittently thereon, a sharpening die movable edgewise of the strip across the path of the latter, and adapted to sever a waste piece from the advancing end of the strip, and

thereby sharpen said end to form an indenting edge, a pair of punching dies movable crosswise of the strip across' the path thereof, and adapted to sever a key from the strip, said key including the said indenting edge, and mechanism for successively operating said sharpening die and punching dies.A

4. In combination, a strip support and guide, means for feeding a strip intermittently thereon, a sharpening die movable edgewise of the strip across the path of the latter, and adapted to sever a waste piece from the advancing end of the strip, and thereby sharpen said end, a pair of punching dies movable crosswise of the strip across the path thereof, and adapted to sever from the strip a key, including the said sharpened end, a reciprocating cross head carrying the sharpening die, and connections between the crosshead and the punching dies adapted to operate said dies after the operation of the sharpening die.

5. In combination, a strip support and guide, means for feeding a strip intermittently thereon, a sharpening die movable edgewise of the strip, across the path of the latter, and adapted to sever a waste piece from the advancing end of the strip, and thereby sharpen said end, a pair of punching dies movable crosswise of the strip across the path thereof, and adapted to sever from the strip a key, including the said sharpened end, a reciprocating crosshead carrying the sharpening die, and bell crank levers connected at the end portions with the crosshead and punching dies, and pivoted to fixed supports between said portions, whereby a movement of the crosshead in one direction, operates the sharpening die, while an opposite movenlrient of the crosshead operates the punching c les.

6. In combination, a strip support and guide, means for feeding a strip intermittently thereon, a pair of beveling dies adapted to form beveled faces on one edge of the strip, a sharpening die movable edgewise of the strip across the path of the latter, and adapted to sever a waste piece from the advancing end of the strip, and thereby sharpen said end, a carrier supporting said beveling dies and sharpening die, a pair of punching dies movable crosswise ofthe strip across the path thereof, and adapted to sever from the strip a key, including the said beveled faces and the sharpened end of the strip, a crosshead supporting said carrier, operating connections between the crosshead and the punching dies, and means for reciprocating the crosshead to operate the several dies.

7. In combination, a strip support and guide, means for feeding a strip intermittently thereon, a pair of beveling dies mov- 'able edgewise of the strip across the path of the latter, said dies being pivotally connected to their carrier, and adapted to form beveled faces on one edge of the strip, and a pair of punching dies movable crosswise of the strip across the path thereof, and adapted to sever a key from the strip, said 'key including said indenting edge.

8. In combination, a strip support and guide, means for feeding a strip intermittently thereon, a pair of beveling dies movable edgewise of the strip across the path of the latter, and adapted to form beveled faces on one edge of the strip, a sharpening die movable edgewise of the strip across the path of the latter, and adapted to form an indenting edge on the strip, and a pair of punching dies movable crosswise of the strip across the path thereof, and adapted to sever a key from the strip, said key including the said beveled edge faces and indenting edge.

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

' JOSEPH II. BURROWS.

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