GB928070A - Pipe flaring tool - Google Patents

Abstract

928,070. Stamping; pipe flaring. MINE SAFETY APPLIANCES CO. Feb. 12, 1962, No. 5240/62. Addition to 892,543. Class 83 (4). A modification or improvement in the pipe flaring tool as disclosed in the parent Specification comprises a movable barrel slidably mounted in the holder behind the sleeve means and containing the cartridge chamber at its rear end and being held in a rear position by removable means connected at the rear end of the holder, the movable barrel being joined with an opening connecting the cartridge chamber with the rear ends of the sleeve means and the piston in the sleeve behind the flaring means, and means connected with the movable barrel for manually moving it forward in the holder after removal of the removable means to force the barrel into frictional engagement with the piston to permit the piston to be pulled back in the sleeve means. The tool housing is provided directly behind the die 3 with diametrically opposed holes 13 for receiving a removable pin 14 that serves as a stop or locator for the end of the pipe. Screwed on to the housing is a tubular holder 16 for sleeve means 17 slidably mounted on the holder and engageable with the die 3 for forcing the die segments against the converging walls of the die holder 4 and into gripping engagement with the pipe. The rear end of the holder slidably receives a barrel 26 provided with a collar 29 having radially disposed handles 31 extending through longitudinal slots 32 in the holder. A breech-block 33 containing a firing pin 34 is screwed on to the rear end of the holder. Slidably mounted in the sleeve 17 is a piston 40 provided with a pipe flaring head 41. A tapered projection 44 on the barrel frictionally engages a tapered bore 43 in the piston and holds the piston in its retracted position in the sleeve. In operation, after the firing pin has been struck, the expanding gases resulting from the detonation of the cartridge, pass through passages 45 in the barrel 26 and drive both the piston and sleeve forward. The die is driven forward by the sleeve and grips the pipe so securely that it is not driven through the die when struck an instant later by the flaring head. Before the flared pipe is removed from the tool the breechblock is removed and the barrel is pushed forward by means of the handles 31 to wedge the projection 44 on to the tapered bore of the piston after which the barrel is retracted together with the piston and the flared pipe is removed from the tool. By connecting the pin 14 to the breech-block by means of a lanyard 47 it can be made impossible to screw the breechblock on to the rear end of the barrel until after the pin has been pulled out of the housing. Inadvertent firing of the tool with the pin in position is thus avoided.