GB916787A - Riveting gun - Google Patents

Abstract

916,787. Blind riveting. OMARK INDUSTRIES Inc. Oct. 19, 1959, No. 35324/59. Class 83 (4). A magazine type hand-operated blind riveting gun has a slot in the top of the body to receive a mandrel carrying a plurality of rivets. The body 20 of the gun comprises a handle 21 and a barrel 22 which has a longitudinal slot 23 and also a slot 24 which passes through the body and accommodates a trigger 26, pivoted at 27 and bearing a roller 28. The roller works on a cam surface 31 on a lever 32 which is pivoted at 34 and which is forked at its upper end 41. An operating slide 43 runs in the rear portion of the body and has a groove 43<SP>1</SP> therein which forms a continuation of the slot 23 in the body (Fig. 3), the slide is urged forward by a spring 47 which engages a pin 46. At the rear end of the slide is a clamp screw 84 which grips a mandrel 81 on which are strung a plurality of hollow rivets 82. Also situated on the mandrel and freely removable therefrom is a tubular rivet follower 88. At the front of the body the mandrel passes through a pair of jaws 69 held by pivot pins 71 to a jaw slide 61, which has a slot 68<SP>1</SP> that registers with the slot 23 and also has a pin 63 which is engaged by a spring 64 and urged rearwards. The rivets are retained on the mandrel by an upset portion 83 at one end and by a tapered head 86 at the other end. To load the gun the tapered end of the mandrel is pushed through the jaws from the rear, then dropped into the slot 23 and clamped by the screw 84. The follower 88 is pushed to feed a rivet through the jaws which close behind it and form an abutment behind the rivet head. Operation of the trigger 26 rotates the lever 32 clockwise (Fig. 2), pushes the slide rearwards and draws the mandrel head 86 through the rivet so that it is expanded into position.