The Artizan . erves to contain a portion of air to act as a cushion toprevent crystallisation of the parts exposed to the direct concussion of the blows,and also to relieve such shocks upon the carriage generally. At the back end of working cylinder A, is the circular valve P, with six ormore inlet ports and six or more exhaust ports. This valve is turned by adouble spiral cam Q, which is carried into end of piston and rod, in which arefour rollers RfiEB, which hear on both sides of the spiral wings of the camsQ. These spiral wings are so sloped that upon the reciprocation of the pistonit is g
The Artizan . erves to contain a portion of air to act as a cushion toprevent crystallisation of the parts exposed to the direct concussion of the blows,and also to relieve such shocks upon the carriage generally. At the back end of working cylinder A, is the circular valve P, with six ormore inlet ports and six or more exhaust ports. This valve is turned by adouble spiral cam Q, which is carried into end of piston and rod, in which arefour rollers RfiEB, which hear on both sides of the spiral wings of the camsQ. These spiral wings are so sloped that upon the reciprocation of the pistonit is gently turned or twisted, and with it the valve to which it is slopes on spiral wings of the cam Q are so placed as to cause the valve P toopen the inlet ports, to admit air to act upon the large area of piston, and toallow it to exhaust again after the piston has struck a blow, when it will return,by a constant pressure upon the small area maintained, through the two portsA X, and vice versa. •. The Artizan,] Aug. 1, 1S65. J Manchester Steam Boiler Association. 183 The piston is prevented from turning in the cylinder by means of two flats,planed on each, which fit into corresponding flats on the bush and stuffing glandsof cylinder. The rotary motion of cylinder A, with piston and tool, is affectedby a square bar S, working inside the cam or spiral bar Q, which receives thesame turn at each stroke of piston as the valve. On the end of the square bar,outside the end of cylinder B, through which it is carried, is a double lever T,at each end of which are two palls, working into a ratchet wheel U, on end ofshaft V, and are so arranged as to give a continuous motion to the same. Thisshaft V is provided with a square part, on which is a brass pinion wheel W,which works into a geared portion of working cylinder A at Y, and so causes itto rotate with the piston and tool by the ratchet U aforesaid. On end of shaftV, the brass pinion slides along the square part of shaft
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
