Patent GB-223628-A (GB)
Title: Improvements in power-operated sheep shears and like tools
IPC: B26B19/24
Filed: 1923-06-23
Abstract: 223,628. Haddan, A. J. H., (Chicago Flexible Shaft Co.). June 23, 1923. Horse and hair clippers. - Relates to power- :actuated sheep shears of the type in which the pressure for holding the cutters in contact does not react on the bearings of the operating lever and comprising a vibrating cutter, an operating lever with connections between the lever and the cutter permitting slight relative movement in a direction transverse to the plane of vibration, and separate means for applying pressure t'o the cutter, and consists of an arrangement whereby the pressure is applied to the cutter through a pressure lever adapted for bodily pivotal movement in three directions, namely (i) movement with the cutter, (ii) movement towards and away from the cutter against the action of the usual strut rod or a resistance connection therewith, and (iii) rocking action about a longitudinal axis parallel to the general plane of the pressure lever. The three pivotal movements may take place about three axes intersecting at a point. The pressure lever may be resilient, or it may be provided with a yielding bearing for the lower end of a thrust rod, the upper end of which bears against an adjustable stop. The base or frame A, Figs. 1 and 2, of the shear has mounted thereon the fixed comb and cutter B and a pivotally-mounted operating lever C, driven by a crank wheel D. The lever C engages the vibrating cutter E by means of studs c entering holes in the cutter so that the latter is free to move up and down. Pressure is applied to the cutter E solely by means of a member F, which is pivoted to swing about the pivotal axis of the operating lever and is also pivotally mounted for vertical movement to apply pressure to the vibrating cutter. The member F is also constructed and supplied with pressure means to apply yielding pressure to the vibrating cutter. To apply the invention to existing types of shears, the construction shown in Figs. 1 and 2 is used. A three-sided yoke J is adapted t'o clasp the lever C at the pivot, the middle side of the yoke having an aperture fitting over the pivot stud h of the lever C under the lever, and the two sides extending above the lever and engaging a cross-head F<1> of the pressure member F. A thrust-rod L of the usual type bears at its upper end against an adjustable cap A<5> and at its lower end against a bearing on the upper side of the pressure member F. To permit rocking movement about a. fore and aft axis, the pivoted cross-head F<1> is separate from the main body of the pressure member F, and the latter terminates at its rear end in a stem f<1> bearing in the crosshead. As shown, the pressure member F is of resilient material, so that the cutter E is pressed yieldingly upon the fixed cutter B. Fig. 3 shows a modification of the support for the pressure member which may be adopted when the tool is originally made in accordance with the invention. The stud H forming the pivot of the operating lever C projects through the lever and its upper end is bored and tapped to receive a pivot seat G for the pressure, member comprising a flange H below which is a coil spring M. The upper part of the seat G forms a, conical socket g in which seats a pivot boss f<2> formed on the end of the pressure member F, the socket and boss being so proportioned that the member F is free to rock in all directions. In a modification, the pressure member is made rigid, and the lower end of the thrust rod L, Fig. 4, bears on a step bearing T<1> mounted slidably in a cup T secured to the pressure member F<x>. The bearing T' is supported by a coil spring T<2>, and is provided with a stem t<1> which normally bears on the bottom of the cup T. Alternatively, the thrust rod may comprise.hollow parts L<1>, L<2>, Fig. 6, fitting one within the other and enclosing a spring L<3>. Reference has been directed by the Comptroller to Specification 21282/97.