US1649334A - Method and apparatus for forming heads on rivets - Google Patents

Description

Nov. 15, 1927. 1,649,334

w. J. BELCHER METHOD AND APPARATUS FOR FORMING HEADS on RIVETS Filed Dec. 20. 1923 I IyVE NTQR. My $4 M,

M A TTORNEYQQ.

Patented ov. 1 5, 1921.

UNITED STATES 1,649,334 PATENT OFFICE.

wsmmn J. nnncnnn, or nan'rronn, oommorrcu'r, assronon To run wnrrmw mre.

00., O! HARTFORD, CONNECTICUT,

A CORPORATION OF CONNECTICUT.

IITEOIO AND APPARATUS FOR FORMING HEADS ON BIVITS.

Application filed December 20, 1923. Serial No. 681,712.

My invention relates to the method and apparatus for forming heads on rivets and is particularly a plicable to the formation of heads on pint es as used in chains of the to reduce the wear and increase the life ofv the chain. The most satisfactory and economical method of fastening the pintles in the links is to form a rivet-head on the ends of the pintles after the chain is assembled. 'In the ty of chain where a soft'pintle-may be used l e formation of the rivet-head on the end of the pintle presents no 'articularly difficult problem, but where har pintles are used, it is a diflicult problem to form the rivet-heads on the ends of the pintles. This method, however," may be found advantageous with pintles which are not hard in the sense used in the preceding sentence.

Several schemes have been used heretoe fore; among, them the use of electricity to heat the pintle and some suitable means for, forming the head while hot; emery discs have been used to raise the temperature of the ends of the pintles by friction and some suitable means subsequently used to form the rivet-heads, and grooves have been placed around the ends of the pintles and sna -collars or washers placed on the ends of t e pintles to hold the parts together. I

All of the foregoing are objectionable for one reason or another. The electrical heating arrangement is complicated and diflicult to operate and is also expensive. It is also impractical if not impossible to sufliciently localize the heating to avoid damage to the hard pintles. The use of the'emery, wheel 5 has the disadvantage that emery dust gets intov the joints of the chain and has a very detrimental effect upon the life of the chain for obvious reasons. Theuse of grooves and collars is expensive in that ,it requires a great amount of manual operation.

instance a member corresponding to the difliculties mentioned connection wit Inuny method the pintles, when in position in the chain, may be moved over a supporting sprocket 1, so arranged that one end of the pintle bearsagainst an anvil 2 and the other end of the pintle comes opposite the face of the member 3 which is carried by a holder 4. The holder 4.- is mounted in a spindle connected with the pulley 5 and, rotated b a belt 6 or other suitable means. The anvi 2 is supported in guides 7 on the base 8 of the machine. The spindle carrying the holder 4 is likewise mounted m guides carried by the base 8. The holder 4 and anvil 2 may be. made to approach or recede from each other by any suitable means known in the art. Ordinarily, the anvil 2 does not rotate but if desired, a holder like the holder 4 may be provided in place of the anvil 2, and rotated. In this member 3 will be carried by the holder.

The sprocket 1 may be automatically rotated or the chain 9 maybe fed through the machine by hand.

Aclamping member 10 engages the top of the chain as it comes over the s rocket 1 and holds the chain in osition. he chain is fed to the sprocket rom a table 11 and after passing over the sprocket and having the rivet-heads formed on the intles the chain drops into a coil on the cor or on suitable mechanism. for transporting it.

As the chain asses throu h the machine as above descri ed, one en of the pintle rests against the anvil 2 andthe other end is op osite the member 3 which is rotating at a ig-h s ed. By operating the mechanism provi ed for that purpose, the anvil 2 and member 3 aplproach each other and the friction created the relative movement between the end 0 the pintle and the memher 3 quickly heats the end. of the pintle to a high temperature. The heating is effected so quickly that the high temperature does not extend to any substantial extent along we the pintle, but remains localized on the end. The temperature is such as to draw the ternper from the end of the pintle, and the pressure is such as to cause the metal to flow :transversely of the pintle to form the rivetwe head 12 on-the end of the pintle. This 0 r-' the in one operation, thus entirely avoiding h 1; g 110 rior methods and, at the same time, producmg better results at a greater rate of speed and at ve much less expense.

I have iscovered that a metal known as stellite is particularly well suited for use in the above method in creating the tempera- I ture and forming the heads on the pintles.

This metal is very hard and durable and does not lose its hardness perceptibly at the tem eratures required in forming the heads on t e pintles. It therefore is not substantially worn away by its use as above described. Nor does it take away any substantial amount of the pintle or other member. Stellite has an extremely hard surface which extends to a thickness of possibly a sixty-fourth of an inch. By forming the member 3 in the form of a cube. six surfaces are available and when one of such surfaces is worn away partially, another face of the cube may be presented, and so on, until all six faces of the cube have been used. t

In practice I have found that one face of a cube of stellite can be used to place a large number of heads on hard pintles. The cube 3 of stellite; is held in place inthe holder 4 by the set-screws 13.

The machine may be adjusted for chains of different widths by the hand wheels 14 which move the carriages 15 on the base 8 of the machine.

In some instances I have found it advantageous to place a cube of stellite where.

the anvil 2 appears in the drawings and to rotate both cubes of, stellite and thereby form heads on both ends of the pintles at the same time. Both forms come within rivet-head in a broad sense.

of apparatus may be used, if desired.

thescope of my invention.

In the foregoing description and in the appended claims I have used the term I do not intend to limit my invention to use on rivets, but intend that it be considered broad enough to include all problems similar to that of forming rivet-heads.

While I have shown and described one form of apparatus for carrying out my method, it will be evident that other forms .heatlng means .to the heate 2. The method of forming rivet-heads .on

chain pintles which consists in passing the I tion thereby drawing the temper of the.

metal locally and applying pressure to the heated metal to cause the metal of the pintles to flow to form the rivet-heads.

3. The method of forming heads on rivets which consists in raising the temperature and drawing the temper of the ends of the rivets by friction and simultaneously applying pressure to the heated ends to form the heads. I

4. The method of forming heads on rivets which consists in raising the temperature and drawing the temper of the ends of the rivets by friction by a non-cutting surface and applying pressure to the heated ends through the friction means to formheads on the rivets. I

5. The method of forming heads on rivets of hard metial which consists in ressing a nonc utting, rotating surface tot e end of the rivet to raise the temperature and draw the temper of the end of the rivet and cause the metal to flow to form.the head.

6. The method offorming'heads on rivets of hard metal which consists in pressing a rotating surface of stellite to the end of the rivet to raise the temperature of the end of the rivet-and cause the metal to flow to form the head. Q

7. The method of forming rivet-heads on chain pintles which consists in passing both ends of the pintles into contact with rotating, non-cutting elements, raising the temperature and drawing the temper of the ends of the pintles by friction and apply-- ing pressure to the heated metal to cause the metal of the pintles to flow to form rivet-heads.

8. The method of forming headson hard pintles for chains which consists in frictionally heating and drawing the temper of the ends of the pintles for a distance not substantially beyond the head to be formed and applying pressure b the frictional 'ortion'to form the head without substantia loss of metal from the pintle'.

9. The method of forming heads on hard metal pintles for chainswhich consists in placing the pintles in the links of the chain,

WARRE J. BELcHEa.

drawing the temperlocally of the ends of

Images