US2070380A - Pin holding device - Google Patents

Description

Feb. 9, 1937. J. SUNNEN 2,070,380,

PIN HOLDING DEVICE Filed Aug. 15, 1954 Patented Feb. 9, 1937 UNITED stares PATENT OFFICE 2 Claims.

My invention has relation to improvements in pin holding devices and it consists in the novel features of construction more fully set forth in the specication and pointed out in the claims.

The invention is more particularly directed to devices for holding pins that are being accurately fitted to an opening in a machine, and it is primarily adapted for the purpose of holding piston pins in order to rit them into the piston bosses, the holes in which have been newly reamed or ground. The closeness with which piston pins are fitted into the openings in the bosses makes it difficult to fit the same by holding the pin in the hand; and on the other hand if the pin is clamped in an ordinary vise while performing the fitting operation there is liability of the vise pressure pressing the pin (which is generally hollow) out of round.

I have, therefore, devised a pin holding device which has for its principal objects the holding of the pin by clamping the wall thereof so as not to exert pressure diametrically across the pin, and the holding of the pin firmly without the application of excessive pressure thereto. A further object of the invention is to provide a pin holding device that is simple and durable and operates on the principle oi a clamp, the cooperating members of which are self-adjusting so that they will properly engage the p-in as soon as pressure is applied thereto without the necessity of carefully fitting said members to the pin.

Further and other advantages will be better apparent from a detailed description of the invention in connection with the accompanying drawing, in which:

Figure 1 is a top plan of my novel pin holder holding a piston pin, part of the pin holder being broken away; Fig. 2 is a side elevation of the pin holder and pin held thereby; Fig. 3 is an enlarged vertical longitudinal section taken on the line S-S of Fig. l; Fig. 4 is a rear elevation of the pin holder with part of the clamping screw broken away; and Fig. 5 is a vertical cross-section taken on the line 5-5 of Fig. 3.

Referring to the drawing, I represents a base member (preferably of cast iron), at the front end of which is erected a pedestal 2, and in the rear end a flange 3, between which there are longitudinally extending ribs 4, 4. An opening '5 extends through the bottom of the base member I between the ribs 4, i to receive a bolt 6 whereby the base member may be fastened to a table or bench, not shown. The pedestal 2 is provided with a longitudinally extending bore 1 inclining slightly upwardly to the front face 8 of the base member I, and a pin 9 is driven into the bore 1, said pin projecting somewhat beyond the face 8 and having its extending portionslightly flattened at the top, as shown by the plane surface I0. A threaded stud II is 5 fixed in the threaded socket I2 in the pedestal 2, said stud projecting a substantial distance above the pedestal. A hollow cap I3 is positioned over flange 3 and pedestal 2 of the base member I, the top wall I4 of said cap having an 10 opening I5 through which the stud II passes. The cap I3 is held in assembled relation with the base I by means of a nut I6, the lower rounded end Il of which enters the countersunk washer I8 disposed between the nut and the 15 top wall I4 of the cap. The upper part of the nut I6 is traversed by the handle part I9 to facilitate the rotation of the nut.

The front wall of the cap I3 is provided with an extension 2l adjacent to the bottom edge of 2O said wall 20 for the purpose of lengthening the surface 22 in which is formed a concavity 23 (in the present instance more nearly V-shaped) which serves as a seat for the piston pin when the latter is held by the holding device, as will now 25 be explained.

In the drawing, a piston pin P is shown clamped between the base member I and cap I3. Obviously, the nut I6 had to be unloosened to allow the cap I3 and base I to be separated suf- 30 ciently in order that the space between the concave seat 23 and projecting end of pin 9 would receive said pin. The operator inserts the pin P in said space and makes sure that the end of the pin P is in abutting relation with the front face 8 of the base member. The nut I is then turned so as to bring the cap I3 and base I together, thus causing the wall of the piston pin to be clamped between the projecting end of the pin 9 and seat 23 of the cap I3. It 40 will be observed that the provision of the flat face I0 on the pin 9 produces opposite corners a, a at the extremity o-f the pin S which allow contact with the inner surface of the piston pin P and force the same to bear from one end to the other of the concave seat 23. The length of the projecting end of the pin 9 is such that these corners a, a will come opposite the approximate center of the concave seat 23. This point of application of the clamping force insures that the piston pin P will be iirmly held against the seat 23 so that there will be no possibility of the piston pin teetering when the piston is applied to it for the purpose of testing the size of the piston pin holes. The inclination of the pin 9 55 so that only its outer extremity will Contact with the bore of the piston pin P insures that the pin will be rmly clamped no matter what the shape of this bore may be.

Having described my invention, I claim:

1. A device of the character described comprising a base member and a cap member movably mounted thereon, one of said members having a concave surface overhanging the other member, the other member having a projecting element below and inclining toward said concave surface, said element terminating within the margins of said surface, and means for moving the base member and the cap member together to clamp the work piece between them.

2. A device of the character described comprising a base member having a pedestal erected at one end, a stud projecting upwardly from said pedestal, a pin projecting laterally from the pedestal, a hollow cap movably mounted over said pedestal and perforated to receive said stud, said cap having a concave surface in juxtaposition with the pin to hold the work against said pin, and a nut operable over the stud to clamp said base member and cap together.

JOSEPH SUNNEN.

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