Patent GB-201410-A (GB)
Title: Improvements in hair clippers
IPC: B26B19/06
Filed: 1922-08-02
Abstract: 201,410. Hans & Danielsson, (Kober & Co., W.). Aug. 2,1922. Hair clippers.-In hair clippers of the kind in which a reciprocating motion is imparted to one of the cutters by a toggle joint so that a double movement of the. cutter takes place at each movement of the operating-lever, the toggle joint members are connected to the operating lever by a link composed of two spaced bars forming with the lever and the members a self-supporting frame which is free from lateral play. In the form shown in Figs. 1 and 2, the operating-lever b is pivoted to the casing a at a point a<2> in alignment with the fixed handle a<1> so that the parts a<1>, b are substantially parallel during operation. The power-transmitting link is pivoted to the lever b at a point near a bent portion thereof, and comprises two spaced bars e, e<1> received in a transverse aperture b<2> in the lever b. The link, which is at right-angles to the movement of the cutter, may be made from a single piece of metal. The toggle-joint members f, g fill the space in the link, are pivoted thereto, and are pivoted respectively to the casing and the movable cutter d, the pivots c<1>, d<1> being in alignment with the direction of movement of the cutter. The toggle-joint members may be formed with forked or recessed portions. The movable cutter is guided on the fixed cutter c by studs a<3> on the casing entering slots in the movable cutter. Instead of studs, rollers contacting alternately with opposite sides of the slot may be provided. The rollers arranged in a line may engage a slot which is wider than the rollers and has offset portions so that alternate rollers engage opposite sides of the slot. In a modified arrangement, each stud carries two rollers, the slot being shaped. so that opposite edges engage different rollers. In another arrangement, rollers in the form of coil springs are arranged in grooves between the cutters. Studs a<4> bear against the front of the cutter d to guide it and to hold a felt strip d<2> forming a dust-proof enclosure. The felt is saturated with oil to keep the cutter lubricated. The bearing-surfaces of the cutters are restricted in area to reduce friction. A spring in carrying a stud n engages a nose b<3> on the operating-lever b. In a modified form of cutter, the operating-handle b<5>, Fig. 14, is pivoted to the casing at a point a<10> out of alignment with the rigid handle a<12> and is formed with a separate arm for operating the toggle-joint lever e<5>, e<6>. The cutter is provided with apertures to receive oily felt plugs, or the plugs may be fitted in the casing. The pivot pin a<13> is made hollow to receive a screw i<1> for clamping the cutters to the casing. The movable cutter is guided by pins arranged in slots, springs being arranged in the ends of the slots to deaden the shock. The boss b<7> of the operating-handle is surrounded bv a coil spring m<1> engaging a projection b<6> on the handle and one of the guiding-studs a<9> for the movable cutters. Means are provided for minimizing the friction between the coil spring and the boss. In some cases, the coils which do not move with the handle are prevented from contacting therewith; in others, steel pins or rollers are arranged between the coils of the spring and the boss, or the coils bear on separate rollers mounted independently of the boss. The stationary cutter may be supported on noise-deadening studs, and the movable cutter may be stopped at the end of its travel by buffers of rubber, fibre, soft metal. &c. In some cases the stationary cutter is adjustably mounted for pressing evenly on the movable cutter. The connection between the movable cutter and the toggle-lever may be made by a ball-and-socket joint.