Patent GB-681125-A (GB)
Title: Improvements in and relating to honing elements
IPC: B24B33/08
Filed: 1950-11-02
Abstract: 681,125. Honing tools. MICROMATIC HONE CORPORATION. Nov. 2, 1950 [Feb. 13, 1950], No. 26735/50. Class 60. [Also in Group V] A honing element comprises an abrasive element contained in a casing, of a material which will wear away at the same rate as the abrasive element, moulded about the latter on all but its working face and having side projections which permit of the mounting of the honing element upon a honing tool body such that the honing element, by the interengagement of the projections on the moulded casing with the tool body, is confined upon the tool body against unwanted displacement with respect thereto. A honing element 11, Fig. 3, comprises a honing stone or abrasive element 13 and a non- abrasive backing member 15 which encases all 'but the working face 17 of the honing stone 13; the side faces of the member 15 have two projections 19 and three grooves 21 extending rearwardly from the working face 17 of the stone 13 to the back face of the backing member 15. Notches 22 are provided in the top and bottom end walls of the locking member 15 rearwardly of the back face of the honing stone 13. A pair of metal reinforcing members 23, 25, Fig. 4, are embedded in the backing member 15. The member 23 is of an oppositely zigzagged shape or has expanded or laterally offset portions 27 so that it is of substantially the same width as the honing stone 13; it extends substantially the full length of the honing stone 13 and its front edge engages the back face of the honing stone 13 while its back edge terminates at the back face of the backing member 15. The member 25 is a flat plate, one side face of which engages one side of the reinforcing member 23; member 25 is shorter than member 23. Two honing elements are simultaneously formed in a mould, thermo-setting plastic material which will wear away at the same rate as the stone being used to form the backing member 15. The resulting product, Fig. 8, is then cut along the longitudinal centre line 41 to produce two identical honing elements; the notches 22 are ground or cut before or after the severing operation. In a modification, Fig. 9, dissimilar honing elements are produced by placing in the mould honing stones 13', 13" of different lengths; the shorter stone 13" is positioned by tab 43 projecting from one side edge of the reinforcing member 23<SP>1</SP>. The moulded article is then cut longitudinally to form two elements. The honing tool 44, Fig. 1, comprises three longitudinally spaced spiders 45 with circumferentially spaced slots to receive honing elements 11. Cam shoes 49 disposed in the slots inwardly of the honing elements 11 are engageable by cam elements 51 for moving the honing elements radially inwardly or outwardly relative to the spiders; garter springs 53 positioned in the honing element notches 22 resiliently hold the honing elements in position in the spiders. The projections 19 of the honing elements fit into recesses in the spiders 45 so as to prevent relative axial movement between the housing elements and the spiders. Wiper elements of wood, plastic or other non-abrasive material are mounted in circumferentially spaced recesses in the spiders.