Patent GB-1128410-A (GB)
Title: A machine for working on a workpiece
IPC: B23B51/04
Filed: 1966-08-08
Abstract: 1,128,410. Sawing. WALTER TREVATHAN CORP. 8 Aug., 1966 [23 Aug., 1965; 6 April, 1966], No. 35390/66. Heading B5L. A machine for cutting a length of pipe or the like to fit another length of pipe comprises a toolhead 17, Fig. 1, rotatable about an axis, means 19 movably mounting the toolhead for movement into and out of engagement with the workpiece, means coupled to the head and responsive to movement of the head for providing yieldable resistance to the movement of the head and for simultaneously supplying fluid to the head. The toolhead 17 consists of an annular cutting tool 145, Fig. 2, having teeth 147 at its lower end and held by a chuck 137 of an electric drill 131 which is secured to a mounting 125 vertically reciprocatable on uprights 99, 101, the movement being effected by rack-and-pinion mechanism 117, 119 driven from a hand wheel 115. The uprights 99, 101 are secured to a plate 97 which is adjustably secured about horizontal pivots in fins 91 mounted on horizontal rods 23, 24 of a base 13 whereby the end of a pipe may be cut at a predetermined angle relative to the axis of the pipe. The pipe is held in a clamp 15 having a pair of jaws which are movable towards and away from one another for engaging a pipe to be cut and are also adjustable in unison transversely of the machine to position the pipe so that its axis is aligned with or is to one or other side of the axis of the cutting tool. The stem 139, Fig. 2, of the cutting tool gripped by the chuck extends downwardly through a sleeve 195 mounted in the plate 87 and at its lower end engages a valve 225, Fig. 3, in a piston 217 slidable in a cylinder 205 having its lower end connected by an inlet valve 247 and pipe 245 to a reservoir 243, the lower end of the rod being mounted in a bearing 233 in the piston. A seal 231 prevents flow of fluid past the piston 217 and when the valve 225 is opened by downward movement of the cutting tool and stem, fluid in the cylinder passes between the valve and its seating and along a passage 213 in the stem to an outlet 215 disposed within the cutting tool so that the fluid acts to cool the tool during a sawing operation, the flow of fluid also acting to yieldably resist the downward movement of the tool. On upward movement of the cutting tool, the valve 225 closes and a spring 227 urges the piston upwardly so that fluid in the reservoir 243 would be drawn past the valve 247 into the cylinder. Springs 249 on the uprights 99, 101 act to resiliently support the cutting head 19. In order to support the the tool laterally when cutting the end of a tube, the side of the tool is engaged by a V-shaped member 187, Fig. 7, carried at the end of a rod slidable in a sleeve 171 mounted on a plate formed with sleeves 163, 165 slidable on the uprights 99, 101. A spring 181 urges the member downwardly and permits the member, upon engagement with the pipe to move upwardly relative to the cutting tool. A bearing 169 is disposed in the plate and supports the stem of the tool below the chuck. In an alternative embodiment, Fig. 11, the cutting tool 261 has a stem 293 mounted in the chuck of an electric drill 259 carried by a plate 257 having sleeves 275, 279 slidable on uprights 265 secured to horizontal support rods 262. The stem below the chuck is supported by a bearing 247, Fig. 17, in a collar 337 carried by the plate, the collar also being formed with an annular recess 339 which is connected to a pipe 325 leading from an outlet valve in the bottom of a cylinder 307. The recess communicates with a passage 325 in the stem having an outlet 329 disposed above a conical plate 331 which deflects cooling fluid from the outlet to the walls of the cutting tool. The cylinder 307 has a piston 311 connected by a rod 314 and arm 310 to the plate 257 so that upon downward movement of the cutting tool, the piston moves downwardly to force fluid through the valve 317 and pipe 325 to the annular recess 339 and walls of the tool. During upward movement of the piston, fluid is drawn through a valve 315 into the cylinder from a reservoir 319. To brace the tool during cutting of a circular hole between the ends of a pipe, a plurality of rollers 353, Fig. 22, are mounted around a hole in a plate 349 to support the tool, the plate being carried by sleeves 357 on the uprights 265. To brace the tool during a semi-cylindrical cut on the end E of a pipe P<SP>1</SP>, a plurality of rollers engage the side of the tool and are mounted in a semi-annular recess in a plate 371 carried on the end of a rod 379 vertically adjustable in sleeves 381, 383. The pipe to be cut is held in a vice housing jaws 407, Fig. 20, which are adjustable towards and away from one another by a screw 419 having right and left-hand threads and rotatable by a crank 431. The screw is axially adjustable by rotation of a hand wheel 437 to adjust the jaws and a pipe held thereby transversely of the axis of the pipe.