US1797702A - Rivet former and header - Google Patents

Description

March 24, 1931. H W 5T,l PlERRE 1,797,702

RIVET FORMER AND HEADER iled` Jan. 29 1950 .27 /MW/ N Patented Mar. 24, 1931iV HENRYW. FEBBRE, F TORRINGTON, CONNECTCUT :arvnr roiamnn am) HEADER .application mea ianury 29,1930. serial no. maar,

rlhis invention relates to a machine for .forming and heading rivets, particularly to adie for use in such machine for automatically forming and heading tubular or split rivets, and has for a special object to provide a die which will automatically form and head the tubular or split rivet and then eject it from the die.

With this and other objects in view, the invention consists incertain novel features of construction, combinations and arrangements of parts as will be more fully disclosed in connection with the accompanying drawing.

ln this drawing Fig. 1 is a longitudinal section through a die construction involving my invention and showing the mounting and operating means `diagrammatically, the parts being in the p0- sition they occupy during the first part of the operation of forming a rivet. i

Fig. 2 is a section of the opposed ends of the die and heading punch showing `their` positions after the blank lhas been cut ofi' and carried to its position in front of the die. Fig. 3 is a section similar to Fig. 1 showing the position of the elementsat the completion 'of the operation of forming and heading the riyet. A i

Figat is a similar section showing the rivet forced out of the die. f

Fig. 5 is a side elevation of the punch pin y for forming the recess in the end ofa split rivet, and n Fig. l6 is a side elevation of such a rivet. B5 Tubular or split rivets are very desirable for certain types of work as they are more easily manipulated than solid rivets and also i make a better appearing finished job. -These tubular rivets have a recess in the free end l0 thereof extending for a given distance from the free end of the shank opposite to the head making this freeend tubular, the remainder of the shank being solid, while in a split rivet the recess extends entirely across l5 the shank in this same free end, as shown in Fig. 6. Both types of rivet-s can befmade with the same mechanism, it being merely necessary to change theshape of the punch for` forming the recess. .At the present time, it is 1 common practice to head t e rivets 1n one operation-and drill the recess in the freeend ofthe shank by means of rotary drills in a separate operation. This is expensive as 'production is relatively low, requires more machinery and handling for' the two operations, and there is high material and labor costfor the drirllsand keeping them sharp. Furthermore, with the use of certain metals for forming the rivets, such for example as aluminum, this drilling operation ds very dificult if not practically impossible for pro duction purposes, because unless the drills are kept extremely sharp, they tear the metal or clog up so as to tear the metal. It has been proposed to punch the recess in the end of the rivet shank, but this has not been successful because up to the present time, so far .as I am aware, there has been no means of automatically ej ecting the nished rivet from 4the die. v

.ln the present construction, I have formed a die and mechanism which not only automaticallv forms and heads the tubular and split rivet by punching the recess in the end of the shank. but also automatically ejects the finished rivet from the die. so that the rivets are formed complete in a single operation on a single machine, the drillingr operations a e done away with and practically y,any metal dsired can be used for the rivets. Further-v more, the complete rivets can be formed at practically the same speed at which ingformer operations, the heading alone was accomplished. 1

y I haveshown in the drawing one construction of mechanism for automatically form'- ing, heading and ejecting the rivets. and have shown merely diagrammatically the-means for operating it. The dieshown can be used Y with a standard type of heading machine and comprises a die block or body 10 mounted in the present' instance inthe stationary frame or bed'll of the machine. The die-is seated .inv a recessor pocket 12 in the frame and seto the forming of the rivet is transmitted di- Y rectlyk to the frame instead of being carried by the set screw. The die 10 basan opmng or passage 15 extending from the outer end thereof and of a size to receive the shank 16 of the rivet, and mounted to slide in this passage is a sleeve 17, preferably provided vwith a head 18`to limit its forward movement in the passage and prevent its moving out of the passage. At its inner end, the passage opens to an enlargement 19 in which the head 18 is located. Mounted to slide within the sleeve 17 is a punch ypin 20 having its free end 21 of a shape to form the recess in the end of the rivet shank. If it is desired to form a tubular rivet as shown in Figs. 1 to 4, the end of this pin will be of smaller diameter than the shank of the rivet, but if it is desired to form a split rivet as shown in Fig. 6, the

end of the punch pin will then be shaped acnei` that will later be described. Surround' ing the sleeve 22 is a coiled compression spring 24 engaging at one end the inner end of the sleeve 17 and at its opposite end under the head portion 25 of the sleeve 22. YThis spring, therefore, tends to shiftl the sleeve 22 away from the sleeve 17 and also ,to carry with it punch pin 20, and therefore, to shift this pin 2() away from the rivet. Because of this operation, the pin 20 may be headed as shown at 26 so that the pin is carried with the sleeve 22. The pin and sleeves are operated by a slidable rod or plunger 27 mounted to reciprocate in the frame or bed and operated by any suitable means such as a lever 28 pivoted at 29 and operated by a rod 30 from a cam 31 on a suitably driven shaft S. This shaft may also carry a crank 32 connected by a pitman or connecting rod 33 with any suitable toggle 34 for reciprocating the gate 35. Mountedin this gate is the punch 36 having a recess 37 in its forward end shaped to form the head 38 of the rivet.y

This operating means for the plunger 27 and gate 35 are shown merely diagrammatically as they may be of any desired type.

In operation, the blank 16 shown in Figs. 1 and 2 Iis cut from a wire or rod of the desired size and metal and fed to a position between the punch 36 and die 10 by any suitable type of cut-olf and feed mechanism, not shown, such as is used with the ordinary heading machines. In the present instance, the punch 36 is moved away from the die to permit the blank 16 to be fed to a position in front of the passage 15. The gate 35 then advances so that the punch 36 engages the outer end of the blank and starts to force it into the end of the passage 14 and force back the sleeve 17 as shown in Fig. 2, at which time the feeding mechanism is withdrawn as is the usual practice in heading machines.

yAs the punch 36 advances, the sleeve 17 and `forces the end 21 of this pin into the end of the rivetshank as indicated in Fig. 1. As the pin 2O advances, relative to the sleeve 17, the sleeve 22 moves with it compressing the spring 24 which holds the smaller end of the sleeve 17 against the end of the rivet shank. As the end of the pin 20 is forced into the end of the rivet, the shoulder 23 on the sleeve 22 advances relative to sleeve 17 until. it engages the inner end ofthe sleeve 17 as indicated in Fig. 3. This will then prevent further backward movement of the sleeve 17 and the rivet blank 16 and, therefore, the co-acting pressure and blow between the punch pin 20, the sleeve 17 and the heading punch 36 will form the head 38 on the rivet as wellas form the punched recess 39 in the free end of the shank. The rivet is now completely formed with the head 38 and the recess 39 as shown 'in Fig. 3.

The heading punch 36 now begins to move away from the die 10, and the plunger 27 is further advanced by the cam 31. This movement of the plunger 27 advances the pin 20 and sleeve 17 to force the rivet out of the passage 15 in the die as indicated in Fig. 4. Aftpin 20 is drawn backwardly to remove its punched end 21 from the recess 39 in the rivet.

The rivet then merely drops out from the position between the punch 36 and the die 10, a new blank 16 is fed into position, the punch 36 comes forward and the operation is repeated. It will, of course, be obvious that as the operation depends on relative movement between the die and punch 36, the punch 36 may be the stationary member and the die moved, or both may be moved in certain timed relation to give the desired operation. Also, this device can be used either in a single or double blow header.

In order to make the split rivet as shown in Fig. 6 which has a transverse recess 40 in the end ofthe shank, it is merely necessary to shape the punch end of the pin 20 to correspond as shown at 21 in Fig. 5. Otherwise, the operations are the same in forming this scription that the rivet is formed, headed.,l

the recess punched in the end ofthe shank and the finished rivet is forced 'out and dropped from the die entirely automatically and in a single operation. No separate operations of drilling are, therefore, required; production is greatly increased and cost is greatly lreduced. Furthermore, the rivets can be made from practically any metals desired.

l Having thus setforth the nature of my invention, what I claim is: t l) l. In "a, rivet former and header, a' stationary die having an internal passage to4 receive the shank of the rivet, a heading punch having a recess to form a head movable toward and from ,said die, a sleeve slidable in said passage, a punch pin slidable in said sleeve to form a recess in the end of. the rivet shank, a" spring tending to withdraw the pin from the rivet, a sheulder movable with the pin to engage yan abutmenton the sleeve to limit movement of the pin in the sleeve in the opposite direction and to shift said sleeve to force the rivet out of-the die, and means for operating the pin in timed relation with the v operation of the heading punch.

2. In a rivet former and header, a stationary die having an internal passage to re ceive the shank of the rivet, a heading punch having a recess to form Sa head movable toward and from said die, arsleeve slidable'inj said passage adapted to cooperate with said punch to upset a head on the rivet, a punch pin slidable in the -sleeve and adapted to form a recess in the end of the rivet shank, means movable with the punch pin to limit movement of the sleeve in one direction and means to operate the sleeve, pin and punchin timed relation to form the rivet and then to advance the sleeve to force the rivet out of the die. l u Y '3. In a rivet former and header, a stationary die having an internal passage to recelve the' shank of the rivet, a heading vpunch having a recess to form a head movable toward and from said die, a sleeve Vslidable in said passage, means to limit movement of the sleeve`in the passage, a punch pin slidable in `said sleeve and capable of forming a recess in the end of the rivet shank, means to'operate the sleeve, pin and punch in timed relation to form the rivet and then advance the sleeve to force the rivet from the die, and meansto withdrawthe pin from the rivet.

4. In a rivet tionary diehaving aninternal passage to receive the shank of the rivet, a heading punch having a recess to form ahead movable'toward and from said die, a pair of relatively movable means in said passage one cf which co-operates with said punch to forma head on former andxhader', a sta one end of the shank and the other of which co-operates with the punch to form a recess in to form a head, means for causing relative movement between the -punch and die toward and from each other, and means in said passage to cooperate with said punch to form a head on one end of the shank and a recess in the ,other end thereof and then forcing the rivetl from said passage, said means including a sleeve' and a punch pin operating through the sleeve, said punch pin carrying means to engage and hold'the sleeve and then move it to force the rivet from the passage. 6. In a rivet former and header, a die having an internal passage to receive the shank of "the rivet, a heading punch having a recess to form a head, saidpunch and die bef 7. Ina rivet former and header,a die hav-I ing an internal passage to receive the` shank of the rivet', a heading punch having a rey cess to fornr ya head, means for causing relative movement between the punch and die to- Lward and from eachother, a pair of relative'- ly movable means in said passage to cooperate with said punch to form a head on one end of the shank and a recess in the opposite end thereof, and means for then advancing one of said pair of means in the passage tb force the rivet out of the die.

8. In a rivet former and header, a die having an internal passage to receive the shank of the rivet, a heading punch having a recess to form a head, means for causing relative movement between the die and punch t0- ward and from eachother, a sleeve slidable in saidpassage, a punch pin slidable in said.

the sleeve toward the rivet and ,to shift said' sleeve to force the rivet out of the die, and

means to operate the pin in timed relation with the relative movement between the die and punch.- I l 9. In a rivet former and header, a die having an internal passage to receive the shank of the rivet, a heading punch having a recess to form a head, means for causing relative movement between the die and punch toward 5 and from each other, a sleeve slidable in said passage, means on the sleeve to limit its movement in one direction, a punch pin slidable in said sleeve capable of forming a recess in the end of the rivet shank, means for withdrawing the pin from the rivet, means movable with the pin to limit relative 4movement of the pin in the sleeve toward the rivet and to shift the sleeve in the passage to force the rivet out of the die, and means to operate the pin in timed relation with the relative movement between the die and punch.

10. A die for a rivet former and header comprising a body having a passage therein to receive the shank of a rivet, a sleeve slid-` able in said passage and adapted at one end to engage the endof the shank, a punch pin` slidable in the sleeve and capable of forming i a recess in the end of the rivet shank, a spring tending to withdraw the pin from the rivet, and a shoulder movable with the pin normally spaced from the sleeve and adapted to engage said sleeve to limit relative movement of the pin in the sleeve.

In testimony whereof I affix my signature. f HENRY W. ST. PIERRE.

Images