US2649821A - Point forming mechanism - Google Patents

Description

g- 1953 H. A. CORBETT 2,649,821

POINT FORMING MECHANISM Filed 001;. 20, 1949 [n DenioP Herbert A. Corbe it .By z'sA hey Patented Aug. 25, 1953 UNITED STATES PATENT OFFICE POINT FORMING MECHANISM Herbert A. Corbett, Auburn, N. Y., assignor, by mesne assignments, to Auburn Fishhook Company, Ino., Auburn, N. Y., a corporation of New York Application October 20, 1949, Serial No. 122,528,

' 2 Claims.

This invention relates to point forming mechanism, and is herein illustrated as embodied in a machine for swaging points on fishhookblanks.

In pointing fishhook blanks on machine commonly employed for the purpose is a rotary swaging machine in which a plurality of rotating dies are caused to deliver a succession of blows to the end portions of a blank advanced between the dies progressively'reducing the material of the blank to shape it into a point. The rapidity with which the swaging operation can be performed is largely determined by the number of blows which the dies can deliver as the'blank is advanced between them. Thus if the number of blows delivered per minute can be increased the speed of advance movement of the blank can likewise be increased, and, accordingly, the time required for the operation will be reduced.

In view of the foregoing, it is an object of the present invention to provide an improved point forming machine which will be effective to form points of uniform character on blanks, and which at the same time will be particularly rapid in its operation.

To this end, and as shown, the invention provides in a machine of the type referred to, a rotary head carrying a pair of dies having cooperating tapered blank engaging grooves, and fingers pivoted on the head for operatively engaging the dies, together with pneumatic means for actuating the fingers to cause the dies to deliver a series of blows to a blank during rotation of the head.

Preferably, and as illustrated, the pneumatic means is an air hammer having a plunger arranged to engage balls carried at the inner ends of the fingers. The air hammer can be operated at a high speed causing a rapid succession of blows to be delivered to a blank by the dies. Furthermore, the arrangement of pivoted fingers operated by the plunger through balls at the ends of the fingers provide a comparatively simple construction for actuating the dies and one which friction and consequent wear of the parts is reduced to a minimum.

These and other features of the invention are disclosed in the following specification and in the accompanying drawings, and are pointed out in the claims.

In the drawings,

Fig. 1 is a side elevation, partly in section, of a swaging machine, embodying one form of the invention;

Fig. 2 is an end view, partly in section of the machine;

Fig. 3 is a side view of a fishhook blank to be operated upon; and

Fig. 4 is a side view of a fishhook blank having a point formed by the machine.

The machine is adapted for operation uponv fishhook blanks such as blank 10, Fig. 3, one end of which has been slabbed off as indicated by reference character l2, and operates upon such: a blank to form a conical point [4, Fig. 4. To this end, the blank I!) is held in a chuck it, in. horizontal position, with its partially formed point extending inwardly toward a rotary swag-- ing head l8 carrying dies 20, which are moved with the head, toward and away from the blank during a point forming operation.

The head I8 is a hollow casting carrying a bushing 22 rotatably mounted in a. bearing 24 at one end of a base block 26. The bushing 22 has secured to it, by screws 28, a face plate 30 which in turn is secured to the head [8 by screws 32, Fig. 2. The head is rotated by means of an electric motor 34 having a pulley 36 carrying a drive belt38 positioned in a groove 40 in the inner end of the head.

Each of the dies 20 is rectangular in shape and has a tapered blank engaging groove 42 in one face thereof, such that, when the dies are in cooperative relation, the grooves together form an elongated conical recess approximating the shape of a point to be formed upon a blank. The dies are slidably mounted in a slot 44, Fig. 2, formed between walls of Wear plates 46, secured by screws 41 to the forward portion of the head. The dies are held against movement axially of the head by a hardened backing plate 48 and by the face plate 30. The face plate has a central opening in which is inserted a nipple 58 which serves to guide the blank to the dies and partiale 1y to support the blank during operation upon it.

Means for causing the dies to deliver blows to the blank as the head is rotated comprises a. pair of fingers 52 pivoted on pins 54 mounted in the head. The fingers have forwardly projecting nose portions 56 adapted to engage bufferblocks 58 mounted in openings 60, Fig. 2, between. the wear plates above and below the dies 20.

erence character 10. may be of any suitable commercial construction, as herein shown, comprises a hollow casing 12,.

mounted in a recess 14 in the block 26, and havthe inner ,enl s o? the fingers 52tofseparate and the nose portions 56 to press sharply upon the bufler blocks 58 causing the dies 20 to deliver a series of blows to a blank presented to the dies.

Vibration of the air hammer is reduged by backing the casing 12 with sponge rubber 84 held in p 14 and a bearing plate 86, a by a set screw 88 extending g secured to the base block 26 by screws 92.

Preferably, the block 26 is rnoiinted "upon a bracket 94 secured by bolts 96 to a dove-tail de 98 positioned in ways IDUin the machine frame {The slide 9 8 and its associated par s reciprocated in the'vvays', iiimountedupon a the frame lil'z e; suitable'meansjno sho successively positip head the blanksto' epoi In h l f i n. Qffih? is rotatedjat'about 60,0(revo'1u theair'ham' cycles per minute. I?! slocated i the. dies, moved'u der t,

g e, an, a: h'eadandlocated'j 4 of the blank progressively tapering it to conform to the shape of the grooves 42 and produces a conical point 14, Fig. 4.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

Pgint i rmme ch n sm com r i frame, means upon the me'fof supporting a blank to be operated upon, a' 'slide mounted upon thevframe for movement toward and away from the supporting means, an air hammer carried mounted for rotation in the lidably mounted in the head, e'rating tapered blank enof fingers pivoted upon the n opposite sides of the dies in position to grip the same, means operatively connecting thewith the hammer for actu ating the fingers, means for rotating the head, andmeans'for reciprocating the slide.

forming mechanis m comprising a i "'oijtiiigiitilank he ntal position" a slidecarr d by the i1 anie,

oiaaiiim ee a th -fen r" w ly mounted cans for nib-vremap? e Qee Tr etreee fi e 111.71 l P this P t n

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