# US 5,342,154 A · Hand machine tool with tool holder > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,342,154 A - Document ID: US5342154A - Status: Granted - Kind: A - Application number: 08/033,137 - Filed: 1993-03-18 - Granted: 1994-08-30 - Earliest claimed: 1992-03-18 - Assignees: Robert Bosch GmbH - Inventors: Peter Holzer - Web page: https://patentgrep.com/patent/US5342154A ## CPC - B23Q 3/12: for securing to a spindle in general (B23Q3/152 takes precedence; chucks B23B31/02) - Y10T 279/17794: Sleeved - Y10T 279/3406: Adapter - Y10T 403/602: by separate spring - Y10T 408/953: Clamping jaws - B23Q: DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING (tools of the kind used in lathes or boring machines B23B27/00); MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A hand machine tool has a rotatable spindle having a longitudinal axis and provided with a cone and an annular surface extending at an angle to the longitudinal axis, a tool holder having a conical opening which surrounds the cone, torque-transmitting elements provided between the spindle and the tool holder, and locking elements cooperating with the ring surface of the spindle, the locking elements being formed as spring wire members. ## Claims ### Claim 1 A hand machine tool, comprising a rotatable spindle having a longitudinal axis and provided with a cone and a ring surface extending at an angle to said longitudinal axis; a tool holder having a conical opening which surrounds said cone; torque-transmitting elements provided between said spindle and said tool holder and formed as form-locking elements which connect said tool holder with said spindle for torque-transmission therebetween; and locking means separate from said torque-transmitting elements and cooperating with said ring surface of said spindle exclusively for locking said tool spindle, said locking means being formed as spring wire members. ### Claim 2 (depends on 1) A hand machine tool as defined in claim 1, wherein said ring wire members engage said ring surface of said spindle, and said ring surface of said spindle is formed as a conically reducing surface. ### Claim 3 (depends on 1) A hand machine tool as defined in claim 1, wherein said ring wire members engage said ring surface of said spindle, and said ring surface of said spindle extends substantially perpendicularly to said longitudinal axis of said spindle. ### Claim 4 (depends on 1) A hand machine tool as defined in claim 1, wherein said tool has a base body, said locking means having at least one locking arm which is radially turnably supported in said base body. ### Claim 5 (depends on 1) A hand machine tool as defined in claim 1, wherein said spring wire members extend substantially tangentially to said ring surface. ### Claim 6 A hand machine tool, comprising a rotatable spindle having a longitudinal axis and provided with a cone and a ring surface extending at an angle to said longitudinal axis; a tool holder having a conical opening which surrounds said cone; torque-transmitting elements provided between said spindle and said tool holder; locking means cooperating with said ring surface of said spindle, said locking means being formed as spring wire members; and a rotatable clamping ring which acts on said locking means. ### Claim 7 (depends on 6) A hand machine tool as defined in claim 6, wherein said locking elements are pressable by said clamping ring against said ring surface of said spindle under its own prestress. ### Claim 8 (depends on 6) A hand machine tool as defined in claim 6, wherein said tool holder has a base body, said clamping ring has a curved path, said locking means including a locking element which has one end radially fixedly anchored in said base body of said tool holder and another end provided with a clamping arm cooperating with said curved path of said clamping ring. ### Claim 9 (depends on 8) A hand machine tool as defined in claim 8, wherein said curved path for said locking element has a depression and an arresting trough. ### Claim 10 A hand machine tool, comprising a rotatable spindle having a longitudinal axis and provided with a cone and a ring surface extending at an angle to said longitudinal axis; a tool holder having a conical opening which surrounds said cone; torque-transmitting elements provided between said spindle and said tool holder; locking means cooperating with said ring surface of said spindle, said locking means being formed as spring wire members; a form-locking structural element which connects said tool holder with said spindle for torque-transmission therebetween; and an adaptor having a thread for screwing a conventional drill chuck, said structural elements being mounted on said adaptor and cooperating with said spindle. ### Claim 11 A hand machine tool, comprising a rotatable spindle having a longitudinal axis and provided with a cone and a ring surface extending at an angle to said longitudinal axis; a tool holder having a conical opening which surrounds said cone; torque-transmitting elements provided between said spindle and said tool holder; and locking means cooperating with said ring surface of said spindle, said locking means being formed as spring wire members, said tool holder having passages through which said locking means pass, said passages running under an angle on said ring surfaces of said spindle and leading said locking means inclinedly on said ring surface.