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Title: Apparatus for driving a length of wire, rod or other elongated body through a workpiece for example for riveting
Claims: We claim: 1. Apparatus for driving a length of wire, rod or other elongate body through a workpiece, comprising first and second dies which are formed with aligned bores, means for moving at least one of the dies towards and away from the other die, while maintaining the alignment of the bores in the dies, for releasably clamping the workpiece between the dies, a punch which conforms to the cross-sectional shape of the bore in the first die, and means for driving the punch along the bore in the first die towards the second die, and stop means for checking the forward movement of the punch selectively at a first position in which the leading end of the punch is flush with the end of the bore in the first die nearer the second die or a second position short of said first position. 2. Apparatus for driving a length of wire, rod or other elongate body through a workpiece, comprising first and second dies which are formed with aligned bores, means for moving at least one of the dies towards and away from the other die, while maintaining the alignment of the bores in the dies, for releasably clamping the workpiece between the dies, a punch which conforms to the cross-sectional shape of the bore in the first die, and means for driving the punch along the bore in the first die towards the second die, the second die having a plunger slidably mounted in the bore thereof which plunger is movably along the bore towards the first die for ejecting material from the bore of the second die, the second die being movable towards and away from the first die by the moving means, the plunger being movable selectively with or independently of the second die and being locatable in a position in which the face of the plunger is flush with that end of the bore in the second die nearer the first die. 3. Riveting apparatus comprising a first die having a plane forward end face and a bore to receive a length of wire, rod or other elongate body which is to form a rivet, a second die having a plane forward end face and a bore of the same cross section as and aligned with the bore of the first die, the bores of the two dies opening to said plane forward end faces, the second die being hydraulically movable towards the first die to grip the work material between said forward end faces of the two dies, a punch which conforms to the shape of the bores and which is movable hydraulically along the bore in the first die towards the second die, a plunger which is slidably mounted in the bore in the second die, and which is movably hydraulically along the bore in the second die towards the first die, and means selectively operable to cause the foward movement of the punch to terminate at a position either short of or flush with the forward end of the first die. 4. Apparatus as claimed in claim 3, wherein the plunger is carried by the second die for movement with the second die and is movable forward hydraulically relative to the second die. 5. Apparatus as claimed in claim 4, further comprising a fixed cylinder which is coaxial with the second die and a piston mounted in said fixed cylinder and connected to the plunger, the piston being spring-biased to urge the plunger rearwardly away from the first die and being operable by fluid pressure in the fixed cylinder to urge the plunger forward against the spring force towards a position flush with the forward end of the second die. 6. Apparatus as claimed in claim 3, wherein the selectively operable means comprises a stop which is movable laterally with respect to the punch between an operative position, in which the stop checks forward movement of the punch beyond said position short of the forward end of the first die, and an inoperative position. 7. Apparatus as claimed in claim 3, further comprising means for severing a length of wire or rod from a supply length at a first station and means for transporting the severed length to the bore in the first die for driving along the bore by the punch. 8. Apparatus as claimed in claim 7, wherein the means for severing the length of wire or rod and the means for transporting the severed length comprise a shear block which has a bore therethrough and which is mounted for guided movement in a direction transversely to the bore in the first die between a first station, in which the bore in the block has one end blanked off and the other end open to receive the leading end of the supply length of the wire or rod, and a second station in which the block is disposed between the leading end of the punch and the first die and has the bore therein aligned with the bore in the first die, a stationary part which cooperates with the block to shear off the length of wire or rod confined in the bore in the block as the block moves from said first to said second station, and means for moving the block between said first and second stations. Other info: Inventors: Claydon, Derek George Wilson (near Banbury, EN) Hill, Gilbert George (near Banbury, EN) Application Number: 509745 Filing Date: 1974-09-27 Publication_date: 1976-04-06 Assignee: Alcan Research and Development Limited (Montreal, CA) Primary Class(es): 227/97 29/243.54, 29/432, 29/524.1 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Moon, Charlie T. Assistant Examiner: Attorney: Cooper, Dunham, Clark, Griffin & Moran |
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