Patent GB-970312-A (GB)
Title: Improvements in dry shavers
IPC: B26B19/28
Filed: 1961-01-10
Abstract: 970,312. Cam-operated switches; two-part couplings. REMINGTON ELECTRIC SHAVER Ltd. Jan. 10, 1961 [Jan. 11, 1960], No. 1060/61. Headings H2B and H2E. [Also in Division B4] In an electric dry shaver, the motor of which is operable by battery or mains, the cutting elements and the motor are mounted on opposite sides of a support 1 of non-magnetic material and are exposed thereon in operative condition for inspection or adjustment, the support 1 having a seating 3 for a plastic cover 2 to enclose the motor and batteries. The support forms an end cap for the motor disclosed in Specification 970,313 [Division H2], an opening in the support receiving a seat 4 for a thrust bearing for one end of an armature shaft 31 and a key projection 9 on the support extending into a recess in the stator to secure one end of the stator assembly 11 to the support. The opposite end of the armature shaft is mounted in a bearing 29 in a recess 18 in a second plastic end cap 17 at the opposite end of the stator assembly, the motor and the end caps being secured together as a unit by the engagement of screws 22 in threaded metal bushings 21 moulded or pressed into the end cap 17 and the cover 2 being secured to this unit by screws 23 engaging in the ends of the metal bushings 21. Projections 71 on the support 1 and aligned ends of the cap 17 form cradles for the battery cells 72 which are retained by a fabric band 71 provided, on one face, with pressure-sensitive adhesive. The batteries are connected in series with the motor through commutator brushes 51 under the control of a switch 60. The switch is manually operable by a handle 63 and opens and closes the circuit through the motor by operation of a resilient arm on contact 54, the arm having a V-shaped end engaging a groove 65 in a cylindrical sleeve 61 to retain the switch in on and off positions. Flexible wire leads 52 from the brushes 51 are secured to contacts 54, 55 which are in electrical contact with bushings 21 and hence with screws 23 which are exposed on the outside of the wall 25 of the casing 2 to provide connection for a suitable mains source of electric power for operation of the motor. A charger disclosed in Specification 970,314 [Division H2] is detachably connectible to the shaver casing end wall 24 seating in a recess 82 in the wall of the charger and having sockets 70 which are provided with slots at the inner ends for prong member 56, 56<SP>1</SP> and are of different shapes to receive plug projections 88, 89 of corresponding shapes to prevent engagement of the charger except in correct relationship. The plug projections 88, 89 have spring contacts 90, 92 and are slotted to receive the ends of the prong members 56, 56<SP>1</SP> which are mounted by rivets on the cap 17. As the charger is engaged with the casing the handle 63 of the switch 60 is automatically turned to the off position by cam portions 95 on each side of a switch operating projection 94 and a plunger 96 engages a movable contact 97 to cause it to engage the free end of a stationary contact 99 mounted on terminal 100. Terminal members 109, 112 in socket 111 form attaching prongs to receive a plug connection from a conventional 110 volt electrical supply.