# US 7,610,839 B1 · Guide for the precise control of portable power tools > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,610,839 B1 - Document ID: US7610839B1 - Status: Granted - Kind: B1 - Application number: 11/515,527 - Filed: 2006-09-05 - Granted: 2009-11-03 - Earliest claimed: 2002-11-25 - Inventors: Bernard J. Bessette - Web page: https://patentgrep.com/patent/US7610839B1 ## CPC - B23Q 9/0014: {Portable machines provided with or cooperating with guide means supported directly by the workpiece during action} - Y10T 83/667: Tool carrier or guide affixed to work during cutting - Y10T 83/68: Entirely work supported - Y10T 83/75: With or to tool guide - Y10T 83/7763: Tool carrier reciprocable rectilinearly - 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 tool trolley or guide for the precise control of hand held power tools such as a circular saw, saber saw, router or other portable power tool to guide the tool along a straight guide path. A chassis upon which the power tool is attached has a trolley like connection with a guide rail releasably secured to a work piece. The chassis has an opening through which the cutters of the tool extend. Tools are mounted on mounting plates which in turn are releasably mounted on the chassis. ## Claims ### Claim 1 A portable guide mechanism for linearly guiding a hand held tool having a power driven cutter relative to a horizontally disposed work piece comprising: a linear guide rail having a flat bottom flange adapted to rest on and be releasably secured to said work piece and first and second parallel walls extending upwardly from laterally opposite sides of said flat bottom flange, said first and second walls being cylindrically shaped to present a pair of parallel guide tracks each having a 180° of upward facing surface and a chassis including a flat panel having a horizontal bottom surface adapted for sliding engagement with said work piece, a top surface adapted for securely mounting said hand held power driven cutting tool and an opening through which said cutter extends when cutting said work piece and a guide structure secured to one side of said chassis having a pair of horizontally spaced self lubricating plastic guide blocks spaced horizontally from one another in the linear direction of said guide rail, said blocks having a semi-circular surfaces complimentary to and slidingly engageable with said upward facing surfaces of said tracks to guide said chassis linearly during cutting of said work piece, said linear guide rail and said guide structure having a configuration permitting said chassis to be lowered onto said guide tracks and said work piece when initiating a cut in said workpiece other than at its periphery. ### Claim 2 The portable guide mechanism of claim to 1 wherein said guide blocks are spaced from one another a sufficient distance to permit the lower part of a circular saw motor to be disposed there between when used with said guide mechanism to cut said work piece. ### Claim 3 (depends on 1) The portable guide mechanism of claim 1 wherein said guide rail is segmented into at least two aligned sections with adjacent ends connected by dowels inserted into aligned confronting annular openings formed by said tracks. ### Claim 4 (depends on 3) The portable guide mechanism of claim 3 having releasable connections interconnecting said aligned sections of said guide rail. ### Claim 5 (depends on 1) The portable guide mechanism of claim 1 including a pair of releasable fasteners securing said guide rail to opposite edges of said work piece, each of said releasable fasteners including a clamping block having a downwardly open cylindrically shaped channel complimentary to said cylindrically shaped track and a vertically disposed opening spaced laterally from said channel and extending between the top and bottom of said block, an adjustable connector extending through said vertically disposed opening and an arm on the lower end of said connector engageable with the underside of said work piece, said connector being vertically adjustable relative to said clamping block. ### Claim 6 (depends on 1) The portable guide mechanism of claim 1 including a tool mounting plate detachably secured to said flat panel. ### Claim 7 (depends on 1) The portable guide mechanism of claim 1 including a cutting tool mounting plate releasably secured to said panel of said chassis and having a cutting tool access opening extends when said tool is mounted on said plate, said opening in said mounting plate being aligned with larger than said opening in said panel of said chassis thereby forming a composite opening with a stepped periphery, and a sacrificial insert complementary in shape to and disposed in said composite opening. ### Claim 8 (depends on 1) The portable guide mechanism of claim 1 wherein said opening in said flat panel is T shaped with the top of the T extending in a direction parallel to said linear guide track and a leg of said T extending at a right angle to said linear guide track, and including a first pair of spaced fasteners connected to and extending upwardly from said flat panel defining a first line perpendicular to said track, a second pair of spaced fasteners connected to and extending upwardly from said flat panel defining a second line perpendicular to said track and parallel to said first line, said lines being on opposite sides of said leg of said T shaped opening, a cutting tool mounting plate having a tool opening through which the cutter of the tool extends when the tool is mounted on said plate and a pair of parallel slots on opposite sides of said tool opening through which said fasteners extend when said cutting tool mounting plate is positioned on top of said panel aligning said tool opening with said leg of said T shaped opening in said panel, said slots and fasteners permitting said tool mounting plate and to be adjusted relative to said panel in a direction at right angles to said guide track. ### Claim 9 (depends on 8) The portable guide mechanism of claim 8 wherein said tool opening in said cutting tool mounting plate is a stepped diameter opening with the bottom diameter being greater than the top diameter and further comprising an annular insert releasably secured to said cutting tool mounting plate with a central tool access opening and a stepped diameter circumference complementary to said stepped diameter opening. ### Claim 10 A portable guide mechanism for linearly guiding a hand held tool having a power driven cutter relative to a horizontally disposed work piece comprising: a linear guide rail having a flat bottom flange adapted to rest on and be releasably secured to said work piece and first and second parallel walls extending upwardly from laterally opposite sides, respectively, of said flat bottom flange, said parallel walls having cylindrically shaped tops presenting a pair of parallel tracks with 180° of upward facing surface, a chassis including a flat panel having a horizontal bottom surface adapted for sliding engagement with said work piece, a top surface adapted for securely mounting said hand held power driven cutting tool and an opening through which said cutter extends when cutting said work piece and a guide structure secured to one side of said chassis having a pair of horizontally spaced self lubricating guide blocks spaced horizontally from one another in the linear direction of said guide rail, said guide blocks having semicylindrical surfaces complementary to said cylindrical of said shaped tops, respectively, said guide blocks being engageable with said guide track to guide said chassis linearly during cutting of said work piece, said linear guide track and said guide structure having a configuration permitting said chassis to be lowered onto said guide track and said work piece when initiating a cut in said work piece other than at its periphery. ### Claim 11 (depends on 10) The portable guide mechanism of claim 10 wherein said opening in said flat panel is T shaped with the top of the T extending in a direction parallel to said linear guide rail and the leg of the T extending at a right angle to said linear guide rail. ### Claim 12 (depends on 10) The portable guide mechanism of claim 10 wherein said guide blocks are made of self lubricating plastic. ### Claim 13 (depends on 10) The portable guide mechanism of claim 10 wherein said guide blocks are spaced from one another a sufficient distance to permit the lower part of a circular saw motor to be disposed there between when used with said guide mechanism to cut said work piece. ### Claim 14 (depends on 10) The portable guide mechanism of claim 10 wherein said guide blocks are releasably secured to said guide structure.