| 摘要 |
901,023. Cartridge-actuated tools for driving anchoring members such as pins, bolts and the like; pins and bolts therefor. ANSTALT FUER MONTAGE-TECKNIK. Feb. 20, 1959 [Feb. 27, 1958], No. 5886/59. Classes 9 (1) and 119. [Also in Group XXV] An explosive tool for driving anchoring members into hard materials comprises a tubular guide 1 to receive the anchoring member 15 in one end, a recoil piston 2, 3 extending into the guide tube 1 and means for accommodating a propellent charge at an appropriate location along the guide between the piston 3 and the anchoring member 15 according to the length of the member 15 to be driven. On embodiment of the tool is shown in the " fired " position in Fig. 1 where a cartridge 12 is located in a chamber 11 in the piston head 3. A separate plunger 14 houses the rear end of the member 15 whose front end is located in the bore 20 of a detachable foot 29 of the tube 1 by springs (not shown) or by opposed permanent magnets 31 (one only shown at 31 of Fig. 1) and a centring washer 19. Fig. 5b shows the before-firing position when the tip of the member 15 rests on the work surface 21. The stem 2 of the piston passes through a friction ring 6 in the detachable head 5 of the tube 1 and supports a recoil-absorbing weight 7. Before firing the plunger 14 is located in the bore of the tube 1 by a friction ring 52 so that it covers exhaust ports 22 leading to an annular expansion chamber 23 and has a striker stud 18 aligned with the cartridge 12. A hammer blow on the weight 7 fires the cartridge which propels the plunger to drive the member 15 and to uncover the ports 22. To retain the cartridge the chamber 11 may be oval in section or the sides of the cartridge case may be bulged (Figs. 9 and 10, not shown). The shock of the discharge is absorbed by a washer 17 in front of the plunger 14 and by the weight 7. The anchoring member may be a pin, a nail, a bolt or the like of any of the forms shown in Figs. 1, 5b, 11 or 12. The cartridge may be located in a chamber in the head of the anchoring member or in the lower surface of the plunger 14 and in the latter instance the tap of the anchoring member will carry a striker stud 47. Alternative firing means may comprise a pistol grip 36 with a trigger 37 and firing spring 33, as in Fig. 6. A number of embodiments in Figs. 13 to 16 (not shown) include various safety devices, such as two varieties of marking device which obtrude in the path of the member 15 when the tool is not in operative contact with the worksurface, means for the propellant gases to escape ineffectually, or means whereby the piston 2, 3 to be rotated by a spring to misalign the striker 18 and the cartridge 12 when the tool is not correctly positioned for firing. A spring-loaded cover, retained by a catch, may be provided to protect the weight 7 from accidental blows under similar conditions. |
