Disk-shaped tool bit for an angle grinder

• US 5,468,176 A
• Filed: 11/01/1993
• Issued: 11/21/1995
• Est. Priority Date: 11/02/1992
• Status: Expired due to Term

• Current Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Original Assignee: Hilti Aktiengesellschaft (Hilti Martin Family Trust)
• Inventors: Winkler, Walter, Udert, Karl E.
• Primary Examiner(s): Kisliuk, Bruce M.
• Assistant Examiner(s): Morgan, Eileen P.
• Application Number:
  US08/146,894
• Time in Patent Office: 750 Days
• Field of Search: 51/32, 51/54, 51/72 R, 51/77 R, 51/109 R, 51/177, 51/180, 51/209 R, 51/209 DL:170 PT, 51/170 T, 451/342, 451/353, 451/359, 451/358, 451/541, 451/548
• US Class Current: 451/359
• CPC Class Codes: B23D 45/165 with a plurality of saw blades or saw blades having plural cutting zones
• CPC Class Codes: B23D 59/025 the lubricating or cooling medium being applied through the mounting means of the tool, e.g. the tool spindle or hub
• CPC Class Codes: B24B 45/006 Quick mount and release means for disc-like wheels, e.g. on power tools
• CPC Class Codes: B24B 55/02 Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant cooling or lubricating during dressing operation B24B53/095; incorporated in grinding wheels B24D
• CPC Class Codes: B24D 5/16 Bushings; Mountings
• CPC Class Codes: B24D 7/16 Bushings; Mountings
• CPC Class Codes: B27B 5/32 Devices for securing circular saw blades to the saw spindle
• CPC Class Codes: B27B 5/34 Devices for securing a plurality of circular saw blades on a single saw spindle; Equipment for adjusting the mutual distance arrangements for adjusting the mutual distances of circular saw machines for lengthwise sawing of trunks B27B7/04

Abstract

A disk-shaped tool bit (8) of an angle grinder has an annular disk-shaped carrier member covered on its radially outer circumferentially extending surface and on its side face surfaces with abrasive grains. A central through opening extending between the side face surfaces (8a, 8b) serves for attaching the tool bit to the angle grinder. The central through opening has a surface extending between the side face surfaces and tapering inwardly from each side face surface toward the axis of the central opening. The inwardly tapering surfaces form engagement surfaces (8c, 8d), at which an attachment element (11) of a receiving device (7) of the angle grinder bears for securing the tool bit in place. The attachment element (11) does not project outwardly from the side face surface (8b) facing outwardly from the angle grinder.

Claims

1. A disk-shaped tool bit for a manually operated power tool comprises an annular disk-shaped carrier member having a central axis of rotation, a radially outer circumferentially extending peripheral surface extending generally in the axial direction and a pair of oppositely facing side face surfaces extending generally radially inwardly from said peripheral surface transversely of the axial direction, and a central through opening extending between said side face surfaces, said peripheral surface and at least a part of each of said side surfaces adjacent said peripheral surface are covered with abrasive grains, wherein the improvement comprises that a first surface extending transversely of said side face surfaces defines said central through opening, said central through opening has a mid-plane located between said side face surfaces and extending perpendicularly to the central axis of rotation, and said first surface comprises a pair of second surfaces each tapering inwardly toward the axis of rotation from a different one of said side face surfaces.

2. A disk-shaped tool bit, as set forth in claim 1, wherein said second surfaces taper symmetrically to said mid-plane.

3. A disk-shaped tool bit, as set forth in claims 1 or 2, wherein said second surfaces of said central through opening are conically-shaped.

4. A disk-shaped tool bit, as set forth in claim 3, wherein said first surface has a profiled configuration.

5. A manually operated power tool comprising a disk-shaped tool bit, said tool bit comprising an annular disk-shaped carrier member having a central axis of rotation, a radially outer circumferentially extending peripheral surface extending generally in the axial direction, and a pair of oppositely facing side face surfaces extending radially inwardly from said peripheral surface transversely of the axial direction, and a central opening extending axially between said side face surfaces, said peripheral surface and at least a part of said side face surfaces adjacent said peripheral surface are covered with abrasive grains, wherein the improvement comprises a generally axially extending first surface defining said central through opening, said central through opening has a mid-plane extending perpendicular to the central axis of rotation, said first surface comprises a pair of second surfaces each tapering inwardly towards the axis of rotation from a different one of said side surfaces, an attachment shaped to cooperate with one of the tapering said second surfaces of said central through opening for securing said tool bit on said power tool whereby said attachment does not project axially outwardly from said side face surface of facing outwardly from said power tool.