US3431766A - Device for drawing wire which eliminates chatter - Google Patents

Description

March 11, 1969- D. K. DEARDORFF 3,431,766

' DEVICE FOR DRAWING WIRE WHICH ELIMINATES CHATTER Filed June 15, 1966 Sheet of 5 INVENTOR Donald K. Dedrdorff ATTORNEY March 11, 1969 0. K. DEARDORFF 3,431,765

DEVICE FOR DRAWING WIRE WHICH ELIMINATES CHATTER Filed June 15, 1966 Shet g of s INVENTOR Donald K. Deordorff MMM ATTORNEY March 11, 1969 D. K. DEARDORFF 3,431,756

DEVICE FOR DRAWING WIRE WHICH ELIMINATES CHATTER Filed June 15, 1966 Sheet 3 of 5 INVENTOR Donald K. Deordorff ATTORNEY United States Patent 4 Claims ABSTRACT OF THE DISCLOSURE A wire to be drawn is held at one end by pliers. At a point spaced from this one end, the wire is held by a die which can be reciprocated. Inbetween the die and pliers, the wire lies against the cam surface of a freely pivotable cam. When said one end of the wire is held in place with the pliers and the die is moved to pull the wire in an opposing direction, the wire pulls against the cam surface and moves the cam towards a cam follower which movement results in locking the wire between the cam and follower. Further movement of the die in said 0pposing direction draws the wire.

This invention relates to a wire drawing apparatus.

A plurality of devices presently exist for drawing wire. In one type a wire is first started through a die on a draw bench, and then gripped by a clamp which is power driven the length of the bench. In a second device a Wire is attached to a revolving drum after being started through the die, the drum functioning as a wire collector as well as the drawing power. A third power driven apparatus involves mounting a die in a suitable adapter in the lower jaws of a tensile strength testing machine, and grasping the wire in the upper jaws. Manual drawing devices are also employed wherein one end of the vvire is held in a vise and the die is hand-pulled along the wire, or the die is held in a vise and the Wire hand-pulled with, for example, a pair of pliers. All these foregoing devices share the disadvantage of having several inches of free wire between the die and gripping or pulling device which length of free wire is a contributing cause to wire chatter and resultant breakage, even with the use of lubricants between the wire and die.

An object of this invention is to provide an apparatus for efficiently drawing wire by short draw strokes thereby avoiding wire chatter and breakage.

For further objects and advantages of the present invention reference is had to the following drawings in which:

FIG. 1 is a top view of the device;

FIG. '2 is a fragmentary perspective view of the device;

FIG. 3 is a fragmentary top view illustrating the manipulation of the device.

Referring to FIG. 1, numeral 1 designates a die holder including a die 2. A fixed support member 3 provides a projecting arm 3a to which the die holder is pivotally secured on a stud. Another projecting arm 3b on member 3 is gripped by, for example, vise jaws 4 to hold the member stationary.

Initially, the end of a wire 5 is tapered by conventional means, and about three inches of it pulled through the die 2, after which it is led around a guide member 6 (shown in FIGS. 1 and 2) which is mounted for pivotal movement on a pin attached to the arm 30 projecting from member 3. Guide member. -6 includes a cam projection 6a which can be brought into engagement with a cam follower member 8 on a section of member 3 when guide member 6 is pivotally moved. The end of the wir which Ice leaves the gripping means between the cam projection 6a and cam follower member 8 is then grasped and held under slight tension with, for example, pliers or clamp 7.

Referring to FIG. 3, by moving the free end of die holder 1 away from arm 30, the die pulls on the wire and takes out any slack; the wire in turn pulling on guide memher 6 to move the member around its pivot toward the die holder. Thereby cam projecting 6a moves against the cam follower section 8 to pinch and securely grip the wire. So as not to damage the wire, the surfaces of the gripping components can be fairly smooth. Further movement of the die holder away from member 3 is made of such magnitude as to pull the die along and thereby draw about to A inch of wire. A return stroke of the die holder in the direction of arm 30 is then made while simultaneously applying tautness with the clamp 7 to easily pull in the freshly drawn wire. Since the pulling action on the wire by the die holder is discontinned during the return stroke, the pulling action on the guide member 6 by the wire is also discontinued thereby interrupting the gripping action exerted by the cam and follower.

Continuous movement of the die holder in a reciprocating manner and movement of the clamp or pliers holding the end of the wire can be accomplished either manually or by the use of a motor. If the apparatus is manually driven, about two feet of wire per minute can be drawn.

Many variations in the device can be employed. With regard to shapes and sizes, the U shape of member 3 is not essential for the gripping action, although this configuration is convenient for gripping the member in a vise; the length of the guide member 6 or the location of the pin about which it pivots can be changed so as to get more or less leverage for gripping the wire. With regard to the employment of additional devices with the basic unit, pulleys or roller bearings may be attached to guide member 6 to reduce friction between the wir and guide; feeding and collecting spools could be employed; a guide could be attached to the die holder to assure that the wire leaves the die perpendicularly.

The essence of the wire drawing device of the present invention is that the length of free wire between the die and wire grip is very short. Thus, this invention will often allow successful drawing of wire that would otherwise chatter and break. Such short drawing lengths require that frequent regripping of the wire be made. The cam gripping component makes such regripping possible.

While the particular apparatus herein described is well adapted to carry out the objects of the present invention, it is to be understood that various modifications and changes may be made all coming within the scope of the following claims.

What is claimed is:

1. In a device for drawing wire,

(a) an elongated die holder with a die positioned between ends thereof to allow passage of said wire transversely through the holder, one of said ends of said holder being pivotally secured to a first fixed support means for pivotal movement of said holder;

(b) wire gripping means supported closely adjacent said die holder, said gripping means receiving wire exiting from said die and directing it outwardly from said gripping means; said die acting to pull on said wire between said die holder and gripping means when said die holder moves away from said gripping means during pivotal movement of said holder, and to discontinue said pull when moving toward said gripping means; said wire being positioned on said gripping means to pull on said gripping means in response to said pull on said wire by said die, when the portion of wire which has been directed outwardly from said gripping means is held under slight tension; said gripping means responding to said pull thereon by tightly gripping said wire whereby said die and gripping means cooperate to hold said wire in a taut position therebetween and whereby said wire is drawn by said die when said die holder is moved away from said gripping means after said gripping means grips said wire; said wire being positioned on said gripping means to discontinue said pull on said gripping means in response to Said discontinuance of said pull on said wire by said die; said gripping means responding to said discontinuance of said pull on said gripping means by discontinuing the grip on said wire whereby movement of said die holder toward said gripping means allows collection of a small length of drawn wire and positions said die for another draw stroke; said gripping means comprising a first section which includes a reciprocating cam means and a second section which includes a fixed cam follower means, said wire passing between said cam and cam follower means, said reciprocating cam means comprising a guide member for guiding said wire on said gripping means, one of the sides of said member having a cam projection over which said wire passes, said projection being opposite said cam follower means to grip said wire between said cam means and cam follower means, said guide member being pivotally secured adof said gripping means includes a first projecting arm maintained in a fixed position.

3. The device of claim 2 wherein said first fixed support means is a second projecting arm' extending from said second section.

4. The device of claim 3 wherein said second fixed support means is a third projecting arm extending from said second section.

References Cited UNITED STATES PATENTS 799,501 9/1905 Thompson 72-285 922,979 5/ 1909 Van Derauwera 7 2-285 1,206,092 11/ 1916 Cetnarowski 72.-274 1,679,906 8/1928 Kinnear 723 18 1,747,999 2/1930 Stachelrodt 72318.

RONALD D. GREFE, Primary Examiner.

US. Cl. X.R.

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