Patent GB-652509-A (GB)
Title: Improvements in or relating to grinding tools
IPC: B24B41/00
Filed: 1948-10-18
Abstract: 652,509. Grinding. VULCAN TOOL CO. Oct. 18. 1948, No. 27049. Convention date, Oct. 18. 1947. [Class 60] A grinding tool of the kind comprising a main body member provided with a spindle at one end thereof for reception in boring machines or the like, a body extension member adapted for lateral movement relative to the body, and a shaft carrying the grinding tool proper rotatably mounted within said body extension and a motor for rotating the shaft, so that the shaft may be rotated about its axis while revolving about another axis, is characterized in that said motor is driven by fluid under pressure. A tool comprises a substantially cylindrical main body portion 10 having an end 11 of reduced diameter from which extends an axial projection 12; a disc 13, surrounding the projection 12 and resting on the reduced end portion 11, is secured to the body 10 by screws 14. A spindle 15 is seated on the disc 13, the base of the spindle having a recess 16 receiving the body projection 12; the spindle 15 is secured to the body 10 by screw 17 and tapers upwardly from its base portion for reception in the chuck of a boring machine or the like, whereby the tool is rotated. A circumferential recess 18 in the reduced end 11 of the body 10 is closed by a non-rotating ring 19 formed with an opening 21 receiving a fitting 22 for connection through shut-off valve 23 to a pressure fluid supply line 24. A transverse dovetailed slideway 25 is formed in the end of body 10 opposite the projection 12; above the slideway 25 and parallel thereto is a transverse blind bore 26. A slide member 27 movable in the slideway 25 has secured to its underside by studs 29 a spacer 28; a stud 31 passes through spacer 28 and slide 27 into a block 32 having a sliding fit in bore 26. The block- 32 has a threaded connection with a screw 33 having a head 34 with a socket 34a to receive a tool for turning the screw, the face of the head being calibrated in degrees. The lower face of the spacer 28 has a threaded bore receiving a threaded projection 36 on the end of a body extension or motor housing 37, having at its outer end a reduced diameter portion longitudinally bored to receive a ball-bearing 38 retained by a closure cap 39. A shaft 41 mounted in the bearing 38 has at its outer end a chuck 42, operated by nut 43, for holding the spindle of a grinding wheel. A rotor 45, seated on the bearing 38, is secured to the inner end of the shaft 41 by a nut 47 ; curved vanes 48 are secured to the rotor 45 and are surrounded by a bearing ring 49. A metal diaphragm 51 is clamped between an internal ledge on the body extension flange 36 and the lower end of spacer 28; above the diaphragm is a chamber 52 formed by a central recess in the spacer element 28. Pressure fluid passes from the recess 18 through passage 55 in body 10 and passage 54 in spacer 28 to the chamber' 52 and thence through ports 53 in the diaphragm 51 to the rotor vanes 48. Pressure fluid exhausts through an opening 56 in body extension 37. The spaces 18, 52 provide a means of ensuring a continuous and even supply of pressure fluid to the rotor 45, obviating the effect of pulsations in the pressure fluid system. Specification 604,919 is referred to.