# US 2014/0191481 A1 · Power tool having improved tool accessory securing mechanism > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0191481 A1 - Document ID: US20140191481A1 - Status: Published application - Kind: A1 - Application number: 14/146,120 - Filed: 2014-01-02 - Published: 2014-07-10 - Earliest claimed: 2013-01-07 - Assignees: Makita Corporation - Applicants: Makita Corporation - Inventors: Takahiro KAWAKAMI; Shin NAKAMURA; Masatoshi NAKAHAMA - Web page: https://patentgrep.com/patent/US20140191481A1 ## CPC - B23Q 3/14: Mandrels in general (expansion mandrels B23B31/40) - B23D 61/006: {Oscillating saw blades} - B24B 23/04: with oscillating grinding tools; Accessories therefor - B24B 45/006: {Quick mount and release means for disc-like wheels, e.g. on power tools} - B27B 5/32: Devices for securing circular saw blades to the saw spindle - B23B 31/10: characterised by the retaining or gripping devices or their immediate operating means - B27B 19/006: {with oscillating saw blades; Hand saws with oscillating saw blades} - Y10T 279/33: Member applies axial force component - Y10T 279/34: Accessory or component - 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 - B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q) - B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS - B27B: SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR (saws specially adapted for pruning or debranching A01G3/08; sawing apparatus specially adapted for felling trees A01G23/091; features not restricted to a particular type of wood saw B23D, e.g. attaching saw blades B23D51/00; machine tool frames, beds, pillars or like members, in general B23Q1/01) - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A power tool includes a clamp shaft for clamping a tool accessory to the power tool and a clamp shaft holding mechanism for selectively locking the clamp shaft to hold the clamp shaft in a position that secures the tool accessory on the power tool. The power tool also includes a lever for shifting the clamp shaft holding mechanism between clamped and unclamped states. The lever is configured such that when an operator grasps the lever and moves it toward a position for releasing the tool accessory, the lever and the operator's hand move away from the tool accessory. ## Claims ### Claim 1 A power tool comprising: a clamp mechanism configured to interposingly hold a tool accessory and an operating mechanism configured to operate the clamp mechanism, the power tool being configured to drive the tool accessory held by the clamp mechanism, wherein the operating mechanism comprises a grasping part configured to be grasped by an operator, the operating mechanism is configured such that the clamp mechanism operates by moving the grasping part to switch the operating mechanism between a first mode, in which the clamp mechanism interposingly holds the tool accessory, and a second mode, in which the tool accessory is removable, and the power tool is configured to switch from the first mode to the second mode by moving the grasping part in a direction that moves away from the tool accessory. ### Claim 2 (depends on 1) A power tool according to claim 1, wherein: the clamp mechanism comprises an urging member and is configured such that the tool accessory is interposingly held by an urging force of the urging member, and the operating mechanism is configured such that the clamp mechanism operates by moving the grasping part against the urging force such that the operating mechanism switches from the first mode to the second mode. ### Claim 3 (depends on 1) A power tool according to claim 1, wherein: the grasping part is movable between a first position and a second position, the operating mechanism is configured such that the clamp mechanism operates by moving the grasping part from the first position to the second position to switch the operating mechanism from the first mode to the second mode, and when the grasping part is located in the first position, a free end of the grasping part is a first distance from the tool accessory and when the grasping part is located in the second position, the free end of the grasping part is a second distance from the tool accessory, the second distance being greater than the first distance. ### Claim 4 (depends on 3) A power tool according to claim 3, wherein: the grasping part is pivotable about a fulcrum, the first position is located on a side of the fulcrum closest to the tool accessory, and the second position is located on a side of the fulcrum farthest from the tool accessory. ### Claim 5 (depends on 3) A power tool according to claim 3, wherein: the grasping part is movable from the first position to a third position, which differs from the second position, the grasping part being securable to a power tool main body at the third position. ### Claim 6 (depends on 5) A power tool according to claim 5, further comprising: an elastic member generating an elastic force that secures the grasping part to the power tool main body at the third position. ### Claim 7 (depends on 5) A power tool according to claim 5, wherein: the grasping part comprises a first portion and second portions disposed along an extension direction of the grasping part and is configured such that, when the grasping part is located at the third position, a distance between the first portion and the power tool main body is shorter than a distance between the second portions and the power tool main body. ### Claim 8 (depends on 5) A power tool according to claim 5, wherein: the grasping part is configured such that it is movable from the first position to the second position by moving in a first direction, and is configured such that it is movable from the first position to the third position by moving in a second direction, which is different from the first direction. ### Claim 9 (depends on 8) A power tool according to claim 8, wherein: the grasping part is movable from the first position to the third position by sliding along the second direction. ### Claim 10 (depends on 8) A power tool according to claim 8, wherein: the grasping part is movable from the first position to the second position by pivoting in the first direction, and is configured such that it is movable from the first position to the third position by pivoting in the second direction. ### Claim 11 (depends on 1) A power tool according to claim 1, wherein: the clamp mechanism comprises an urging member and is configured such that the tool accessory is interposingly held by an urging force of the urging member; the operating mechanism is configured such that the clamp mechanism operates by moving the grasping part against the urging force to switch the operating mechanism from the first mode to the second mode; the grasping part is movable between a first position and a second position; the operating mechanism is configured such that the clamp mechanism operates by moving the grasping part being moved from the first position to the second position to switch the operating mechanism from the first mode to the second mode; when the grasping part is located in the second position, a free end of the grasping part is a first distance from the tool accessory and when the grasping part is located in the first position, the free end of the grasping part is a second distance from the tool accessory, the first distance being greater than the second distance, the grasping part is pivotable about a fulcrum, the first position is located on a side of the fulcrum closest to the tool accessory, the second position is located on a side of the fulcrum farthest from the tool accessory, and the grasping part is movable from the first position to a third position, which differs from the second position, and such that it is securable to a power tool main body at a third position. ### Claim 12 A power tool comprising: a location for detachably attaching a tool to the power tool; a clamp for securing the tool to the power tool at the location; a lever having a free end, the lever being displaceable from a first position to a second position; and a linkage operably connecting the lever to the clamp such that displacing the lever from the first position to the second position changes the clamp from a clamping configuration to a releasing configuration; the free end of the lever being located a first distance from the location when the lever is in the first position and the free end of the lever being located a second distance from the location when the lever is in the second position, the second distance being greater than the first distance. ### Claim 13 (depends on 12) A power tool according to claim 12, wherein the free end of the lever moves away from the location as the lever displaces from the first position to the second position. ### Claim 14 (depends on 12) A power tool according to claim 12, wherein an amount of force required to displace the lever from the first position to the second position is greater than an amount of force required to displace the lever from the second position to the first position. ### Claim 15 (depends on 12) A power tool according to claim 12, further comprising a housing, wherein the lever is displaceable to a third position, different than the first position and different than the second position, the lever being securable to the housing in the third position. ### Claim 16 (depends on 12) A power tool according to claim 12, wherein the lever is pivotable about a first axis and is pivotable about a second axis perpendicular to the first axis. ### Claim 17 (depends on 12) A power tool according to claim 12, wherein the lever is slidably mounted on a fulcrum, about which the lever is pivotable from the first position to the second position. ### Claim 18 (depends on 12) A power tool according to claim 12, further including a tool clamped to the power tool at the location. ### Claim 19 (depends on 18) A power tool according to claim 18, wherein: the free end of the lever moves away from the location as the lever displaces from the first position to the second position, an amount of force required to displace the lever from the first position to the second position is greater than an amount of force required to displace the lever from the second position to the first position, the lever is displaceable to a third position, different than the first position and different than the second position, and is securable to a housing of the power tool in the third position, and the lever is pivotable about a first axis and is pivotable about a second axis perpendicular to the first axis. ### Claim 20 A power tool comprising: a spindle pivotably drivable by a motor, a clamp configured to detachably retain a tool accessory against an end of the spindle, and a lever connected to a pivotable eccentric part, operatively coupled to the clamp and having a free end, the lever being pivotable relative to a housing in order to move the free end from a first position, in which the tool accessory is clampable against the end of the spindle, to a second position, in which the tool assessory is removable from the end of the spindle, the first position being closer to the end of the spindle than the second position.