Patent GB-458764-A (GB)
Title: Improvements in and relating to machines for running together gears or like cooperating parts
IPC: G01M13/02
Filed: 1935-06-24
Abstract: 458,764. Grinding gear-wheels. MARBAIX, G. E., Vincent House, Vincent Square, Westminster.-(Michigan Tool Co. ; 7171, Six Mile Road East, Detroit, Michigan, U.S.A.) June 24, 1935, No. 18077. [Class 60] A machine for running together gears or like co-operating parts required to operate noiselessly is provided with means for changing the direction of transmission of the load without changing the direction of rotation of the parts. In the machine shown, the gears 1, 3 to be run together are supported on shafts 2, 4, between head stocks and tail stocks 5, 7, and 9, 11 respectively, the stocks 5, 7 being mounted on a bedplate 13 and the stocks 9, 11 being mounted on a bedplate 15 which may be adjusted relatively to the bedplate 13 by means of a screw 45. A shaft 25 rotated by a reversible electric motor 101 drives through overrunning clutches 121, 123 two hollow shafts 117, 119, so arranged that for one direction of rotation of the shaft 25 the shaft 117 is driven and for the other direction the shaft 119 is driven. The shaft 117 drives through belt gearing 21 and shaft 2, and the shaft 119 drives through belt gearing 23 the shaft 4, the directions of rotation of the shafts 2, 4 remaining unchanged. The shafts 117, 119 carry brake drums 131, 133 engaged by pivoted brake arms 135, 136, mounted on shafts 141, 142. The brake arms are operated against the resistance of springs 143, 144, to apply a load to the shaft 117, 119 not clutched to the shaft 25 by a roller-carrying member 145 on a shaft 147. Heat generated by the brake drums is dissipated by ventilating ducts 132, 134 and deflectors 130. The shaft 147 is operated from a hand wheel 161 through chain and sprocket gearing. The shaft 147 may also carry an arm 173 engaging angularly spaced arms 175, 177 on the shaft 179 of a switch reversing the armature connections of the motor 101 so that the change over of the driving relations of the gears 1, 3 and the operation of the braking mechanisms are effected simultaneously. The speed of the motor may be adjusted by means of a rheostat in series with the motor. The clutches 121, 123 suitably comprise a sleeve 110 keyed to the shaft 25 carrying coiled springs 112, 114, one end of the spring 112 entering a lug 116 on the sleeve 110. Rotation of the shaft 25 in one direction tends to unwind the springs in the shaft 117 and to wind them tighter in the shaft 119 so that shaft 117 is driven. Rotation in the opposite direction causes the shaft 119 to be driven. The spring 114, which is smaller than the spring 112 effects the initial gripping action. The shaft 25 is supported in roller bearings 109 on a bedplate 113 which is flexibly secured to the frame 29 by rubber supports 100. The tail stock 11 may consist of two sections 55, 57, the section 55 carrying a rectangular rail 54 slidably engaging a recess 58 in the section 55. The engaging surfaces 59 of the sections 55, 57 are inclined so as to allow horizontal adjustment of the section 55. A vertical adjustment may be similarly effected by means of an insert 68 having an inclined surface 70. Micrometer adjustment of the sections may be effected by means of bolts 62, 76 engaging the rail 54 and insert 68 and the parts are then locked together by bolts 61, 63, 78. The tail stock 7 may be similarly constructed.