GB488219A - Improvements in and relating to controllers for electric motor equipments - Google Patents

Abstract

488,219. Actuating controllers. GRAY, W. T., and METROPOLITAN - VICKERS ELECTRICAL CO., Ltd. Jan. 4, 1937, No. 242. [Class 38 (iii)] A controller of the kind in which the operator performs an additional control operation before initiating acceleration in order to obtain acceleration to the higher speed or speeds, comprises an abutment 23 coupled with the moving element of the controller and co-operating with an abutment 18 biassed into the path of movement of the member 23 and preventing movement of the controller to its final position, a locking member 14 coupled to the moving element of the controller having a surface interrupted at 15 which co-operates with an auxiliary control member to permit operation of the abutment 18 into and out of the path of movement of the abutment 23 by the biassing means and the auxiliary control member respectively, when the controller occupies its off position. The main controller is operated by a handle 1 and the auxiliary control member comprises a thumb lever 5 coupled to an auxiliary shaft 6, the shaft being biassed by a spring 9 acting in compression and torsion. With the thumb lever in the position shown, operation of the controller is limited to its third notch by engagement of the curved face of the abutment 23 with the abutment 13 as shown in Fig. 5. Since operation of the controller moves the recess 15 of the disc 14 out of line with the abutment 18 depression of the lever 5 is prevented. While the controller handle 1 is in its off position the lever 5 may be depressed to operate the abutment 18 to the underside of the disc 14 so that the controller may be operated, the disc 14 retaining the abutment 18 in its depressed position, until a further abutment 24 carried on the underside of the disc 14 engages the abutment 18. Thus the controller may be operated to its fourth notch. While the controller is in its off position the lever 5 may be depressed and rotated as shown in Fig. 6, so that the abutment 18 is situated below the disc 14, but with a surface 16 engaging the edge of the disc 14 when the controller is rotated. In this way the abutment 18 is retained in a position out of the path of the abutments 23, 24, and the controller may be operated to its final notch. The lever 5 and the abutment 18 are returned to the normal position shown from either of its actuated positions when the controller is in its off position by the spring 9.