Patent GB-803598-A (GB)
Title: Improvements in or relating to powder actuated tool
IPC: B25C1/12
Filed: 1956-05-30
Abstract: 803,598. Cartridge actuated tools for firing bolts &c. REMINGTON ARMS CO., Inc. May 30, 1956 [June 22, 1955], No. 16775/56. Class 119 The invention relates to a powder actuated stud driving tool which can drive any of a range of shapes and sizes of fastening devices and permits the use of a range of different cartridges. According to the invention, the tool. Figs. 1 and 2, comprises a breech assembly with its housing 58 and handle 59 and a barrel assembly in its cover 12 connected to and cooperating with a chamber-plate 28 for movement from a breechclosed to a breech-open position. A hinge pin 30, rigidly fixed to the chamber-plate 28, has ends on which a frame plate 11 in the cover 12 and a breech-plate 34 in the housing 58 have rotational and longitudinal movement against springs 31 and 36. The breech assembly, the chamber-plate 28 and the barrel assembly can thereby either be held closed together in alignment, as in Fig. 1, or opened out as in Fig. 2, in which position pulling back a sleeve 54 will cause a rammer to eject the spent cartridge from the chamber bushing 27. In the closed position the three parts of the breech assembly are locked together by a locking sleeve 40 which can be rotated to engage lugs 41 and 43 with corresponding projections on the breech-plate 34 and the frame plate 11. The tool is reloaded by inserting a cartridge and a stud separately and the chamber bushing is interchangeable to suit the size of cartridge. A range of interchangeable barrels is provided, the bores of which are made to suit various shapes and sizes of studs; for example, Fig. 29 (not shown) illustrates a barrel with a bore in the form of a rectangle with rounded ends appropriate for driving a staple. The barrel 10 is removably screwed into the frame plate 11 where it is retained by a screw, spring and stud assembly (not shown) which also co-operates with the locking sleeve 40 as a safety interlock. Around and movable relative to the barrel 10 is a sleeve 13 carrying a guard 15 urged forward by a spring 17 so that its lip is normally a little in advance of the barrel. The guard 15 is interchangeable to suit various barrels and is replaceably attached to a movable action plate 19 by a spring ring 20, all of which components are urged forward by springs; Fig. 3 (not shown). An action bar 26 fixed to the action plate 19 extends rearwards through the chamberplate 28 where it abuts on extension bars 70 and 71 that are kept in contact with it by a spring plunger 73. When the muzzle of the tool is pressed against the work surface the guard presses back the action bar 26. A two-armed gear 74, Fig. 10a, which is fixed to the extension 70 is thereby caused to press on a shoulder 65 to cock a striker 64 against the force of a spring 77. The same movement frees a trigger 84 for firing, which is effected by a firing bar 83 which rotates a gear lever 80 and trips the nose 79 of the gear 74, so disengaging the shoulder 65 of the striker 64. A plate 86 forms part of a safety feature which requires that the locking sleeve 40 shall be manually held in the fully locked position and an additional safety interlock is provided between the locking sleeve 40 and the trigger bar 83 by a nose 96 on the latter. Alternative arrangements by which the breech assembly 58, chamber-plate 28, and barrel assembly 12 may be displaced for opening are illustrated in Figs. 11 to 28 (not shown). These include: relative transverse displacement without relative rotation or longitudinal displacement; relative rotation about a tranverse pivot without longitudinal movement; relative rotation about one longitudinal pivot with longitudinal movement; relative rotation about one transverse and one longitudinal pivot with or without longitudinal movement; relative rotation about a longitudinal pivot with transverse movement