US2433103A

US2433103A - Anvil unit for rivet setting machines

Info

Publication number: US2433103A
Application number: US694741A
Authority: US
Inventors: Thomas J Doyle
Original assignee: TUBULAR RIVET AND STUD Co
Current assignee: TUBULAR RIVET AND STUD Co
Priority date: 1946-09-04
Filing date: 1946-09-04
Publication date: 1947-12-23
Anticipated expiration: 1964-12-23

Description

Dec. 23, 1947. T, J, DOYLE 2,433,103

ANVIL UNIT FOR RIVET SETTING MACHINES Filed Sept. 4, I946 LW'EN TOR.

7/7 JD BY We 6 J gw Arroewgy Patented Dec. 23, 1947 ANVIL UNIT FOR RIVET SETTING MACHINES Thomas J. Doyle, Milton, Mass, assignor to Tubular Rivet and Stud Company, Quincy, Mass., a corporation of Massachusetts Application September 4, 1946, Serial No. 694,741

3 Claims.

This invention relates to a rivet setting machine and particularly to an anvil for a hollow rivet setting machine.

The invention has for an object to provide a novel and improved anvil of the character specified having separable portions adapted to be aligned in accurate registration during the setting operation and in which provision is made for adjusting the separable portions in accurate alignment and for loclnng the portions in their adjusted position in a simple, efficient and superior manner.

With this general object in View and such others as may hereinafter appear, the invention consists in the rivet setting anvil hereinafter described and particularly defined in'the claims at the end of this specification.

In the drawings illustrating the preferred embodiment of the invention, Fig. 1 is a side elevation of a typical rivet setting machine embodying the present invention; Fig. 2 is a cross sectional view of an anvil embodying the present invention shown in a position preparatory to setting a rivet to secure together the parts assembled on the anvil; Fig. 3 is a similar view with the anvil shown in its rivet setting position; Figs. 4 and 5 are top and bottom end views..respectively of the present anvil; and Fig. 6 is a greatly enlarged view of the separable portions of the anvil in their aligned and rivet setting position of operation.

In general, the present invention contemplates a novel and improved construction of a hollow rivet setting anvil having separable portions including a body portion and a spring pressed pin portion, each being provided with cooperating surfaces which when fitted in proper alignment form a continuous curved or concave surface against which the end of the hollow rivet engages and which effects flow of the metal outwardly to set the rivet. In operation, the spring pressed pin is normally extended beyond the body portion for the purpose of receiving the parts to be secured in assembled relation, and, upon engagement of the hollow rivet with the extended pin, the latter is depressed into a position to cooperate with the body portion of the anvil to perform the rivet setting operation.

In practice it is desirable that the component parts of the separable rivet setting members of the anvil be in absolute alignment to form a continuous curved surface in order to obtain an efficient rivet setting operation without the development of obstructions to the flow of the metal of the tubular end of the rivet as it is being set 2 up. For example, in the event that the curved surface of the spring pressed pin member is slightly higher than the curved surface of the body portion, the metal will flow outwardly to an extent such as to split the metal and form cracks in the edges of the spread out metal. On the other hand, in the event that the curved surface of the body portion of the anvil is slightly higher than the curved surface of the end of the. pin, a jamv will occur and effect outward buckling of the hollow end of the rivet and in some instances this may effect breakage of the parts being assembled. In order to avoid these and other difficulties flowing from the development of such obstructions, the present invention contemplates a novel construction of anvil wherein provision is made for enabling the component members of the anvil to be readily and accurately collocated or adjusted and locked in a position in which a continuous smooth curved. die setting surface is obtained.

Referring now to the drawings, the invention is herein illustrated as embodied in a rivet setting machine shown in Fig. 1, and which in general comprises an anvil indicated at It and a vertically reciprocal driver l2 arranged to cooperate with the anvil to efiect setting of the,

hollow rivet I 4 to secure together the parts to be assembled. The driver [2 may be actuated through any usual or preferred driving mechanism including a one revolution clutch, not shown, and through linkage indicated generally at 6 to effect vertical reciprocation of the driver. A supply of rivets is maintained in a feed chute l8 arranged to release a rivet each cycle of operation into a position between a pair of yieldably mounted jaws 20 arranged to hold the rivet in alignment with the driver and the anvil. In operation, the holding jaws 20 are arranged to move with the driver for a part of the downward stroke until the hollow end of the rivet engages the anvil whereupon the jaws come to rest. The end of the driver I2 is preferably provided with a concave surface arranged to fit the convex surface of the head of the rivet. Continued movement of the driver in engagement with the head of the rivet causes the yieldably mounted jaws to spread apart to release the rivet from the jaws and permit the driver in cooperation with the anvil to efiect setting of the rivet. As shown in Fig. 1, the anvil unit lll may be stationarily supported in a threaded holding member 22 adjustably carried in a bracket 24 forming a part of the machine frame. A look nut 26 may be provided for locking the holding member 22 in its adjusted position in accordance with the stroke of the driver and length of the rivet being set. A set screw 28 may also be provided to hold the anvil in the member 22.

Referring now to Figs. 2 and 3, the rivet setting anvil forming the subject matter of the present invention comprises generally a cylindrical body portion 30 and a spring pressed pin 32 slidingly mounted in the body portion 30. The upper end of each

member

30, 32 is provided with

component portions

34, 36 respectively of the annular concave rivet setting surface.

The spring pressed pin 32 is normally extended beyond the upper end of the body portion, as shown in Fig. 2, to receive thereon the parts' to be secured together in assembled relation, a typical assembly being herein shown as comprising a radio part including a metal washer 38', ceramic insulating ring 40 and a metallic connecting element 42. In operation, the spring pressed pin 32 is arranged to be depressed to align the upper end thereof with the upper end of the body portion so that the

component portions

34, 36 form a continuous unitary rivet setting surface to per-' form the setting operation.

In accordance with the present invention provision is made for assuring correct alignment of the

component surfaces

34, 36 in order to prevent the development of obstructions to the flow of the metal and, as herein shown, the body portion 30 is provided with an enlarged bore 44 threaded at its lower end to receive a stop screw or collocating member 46. The pin 32 is provided with a collared portion 48 which bears against the end 50 of the bore to limit the upward extension of the pin, and, a coil spring 52 interposed between the underside of the collared portion 48 and the top of the stop screw 46 retains the pin in its extended position until the pin is engaged by a rivet l4 being driven by the driver l2 into setting position, as shown in Fig. 3.

The slidably mounted pin 32 is provided with a depending portion 54 extending beyond the col-' lared portion 48 and which extends into the upper end of the spring 52. Correct alignment of the

surfaces

34, 36 in the depressed position of the pin 32'is attained by the engagement of the lower end 56 of the depending portion with the upper end of the stop screw 46.

In practice, the adjustment of the stop screw may be easily and quickly effected by a wrench insertable into the hexagonal opening 58 formed in the end thereof, and, while the pin is held in its depressed position, the screw 46 is adjusted until the component surfaces 34, 36- are in exact alignment.

In order to lock the anvil unit in its adjusted position, a lock nut 6i] is provided which cooper ates with the lower end of the screw 46 and, when tightened into locking position, engages the end surface 62 of the body portion 30, as illustrated. The lock nut 66 may and preferably will becylindrical and of the same diameter as the body portion 3i] to form in effect a continuation thereof, and, the lock nut may be set into locking position by a spanner wrench engageable with the" slots 64 provided in the end ofthe nut.

From the above description it will be seen that the present rivet setting anvil is constructed of separable portions, each portion being provided with surfaces arranged to cooperate to form the die surface during the rivet setting operation and that correct alignment of the die surfaces may be attained by a stop member threaded into one of? said portions and engageable" with the other of said separable portions and when both are moved into rivet setting position with the surfaces in alignment, provision is made for locking the stop member in its adjusted position. From the foregoing description it will be observed that the threaded stop member 46 provides means whereby the component die surfaces may be collocated into a single predetermined registered and aligned position from positions either substantially above or substantially below such collocated position. As best shown in Fig. 6, the

separable die sections

34, 36 formed on the body 30 and pin 32 respectively may comprise an annular concave surface. The pin being preferably of cylindrical shape is movable relative to the body portion or the anvil into and from die setting position, and in the latter position the

surfaces

34, 36 align to form in the illustrated structure an annular die surface of semi-circular shape.

While the preferred embodiment of the invention has been herein illustrated and described it will be understood that the invention may be embodied in other forms within the scope of the following claims.

Having thus described the invention, what is claimed is:

l. A rivet setting anvil unit of the character described, comprising: a body portion and a pin portion slidably movable in said body portion, said pin portion having an abutment area adapted to be engaged by a spring, each portion having one component of a die surface, said portions being adapted to be aligned in a single predetermined registered relation so that the component die surfaces form a complete rivet setting die surface during a rivet setting operation; adjusting means for collocating the component die surface on said pin portion from a position either substantially below or substantiall above the component die surface on said body portion with the component die surface on said body portion when said pin portion is in its fully depressed position, said adjusting means comprising acylindrical member having an external thread and having an upper end face forming an abutment to be engaged by the lower end of said pin portion to limit the movement of said pin portion into said body portion; a compression spring disposed in said body portion between said cylindrical member and said abutment surface on said pin portion, said body portion having an internally threaded portion engaged by the external threads on said cylindrical member, said cylindrical member having threads extending beyond the lower end of said body portion; and a lock nut on the threads of said extended portion of said cylindrical member engaging with said lower end of said body portion for locking said cylindrical member in said single predetermined position relative to said body portion to maintain said component die surfaces in alignment during successive rivet setting operations.

2. A rivet setting anvil unit of the character described, comprising: a body portion and a pin portion slidab-ly movable in said body portion, said pin portion having an abutment area adapted to be engaged by a spring, each portion having one component of a die surface, said portions being adapted to be aligned in a single predetermined registered relation so that the component die surfaces form a complete rivet setting die surface during arivet setting operation; adjusting means for collocating the component die surface on said pin portion to a position in alignment with thecomponent die surface on said body portion when said pin portion is in its fully depressed position, said adjusting means comprising a threaded element having an abutment surface engageable by the lower end of said pin portion and being axially adjustable relative to said body portion for effecting alignment of the component die surface of said pin portion with the component die surface of said body portion from a position either substantially below or substantially above the component die surface on said body portion so that said component die surfaces are in alignment when said pin is in its fully depressed position in engagement with said abutment surface; a compression spring disposed in said body portion between said threaded element and said abutment area; and locking means engaging said body portion and said threaded element for locking the threaded element against inadvertent rotation with respect to said body portion, whereby to maintain said component die surfaces in alignment during successive rivet setting operations.

3. A rivet setting anvil unit of the character described, comprising: a body portion and a pin portion slidably movable in said body portion, said pin having an abutment area adapted to be engaged by a spring, each portion having one component of a die surface, said portions being adapted to be aligned in a single predetermined registered relation so that the component die surfaces form a complete rivet setting die surface during a rivet setting operation; means for collocating the component die surface on said pin portion from a position either substantially below or substantially above the component die surface on said body portion with the component die surface on said body portion when said pin portion is in its fully depressed position; a compression spring disposed in said body portion between said collocating means and said abutment area; and means for locking said collocating means in a position to maintain said component die surfaces in alignment during successive rivet setting operations.

THOMAS J. DOYLE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 556,367 Nolan Mar. 17, 1896 1,182,397 Maenche May 9, 1916 1,507,600 Hallam Sept. 9, 1924 1,716,852 Havener June 11, 1929