1. Field of the Invention
The present invention relates generally to a bench grinder, and more particularly to a tool rest for use with a bench grinder.
2. Description of the Related Art
Bench grinders generally have one or more abrasive wheels rotating on an axle and driven by a motor. Work articles are moved into contact with the rotating abrasive wheel to abrade material from the work article, such as to shape the work article to a desired shape. Abrasive wheels or grinding wheels may be used to sharpen tools, such as knives, chisels, gouges, plane blades, drill bits, scissors, hedge shears, clippers, snips, axes, or other tools. Work articles may be supported in the user's hands while pressed against the abrading wheel or may be supported on a work article support. When the work article is to be shaped with a particular shape or angle or when control of the work article is desired during grinding, a work article support is provided.
Work article supports are provided in a variety of types and shapes. A common work article support is a tool support, which provides a flat surface adjacent the face of the grinding wheel on which the work article is supported during grinding. The tool supports may be fixed or adjustable.
A tool such as a chisel or gouge such as used to cut material during turning of material on a lathe has a desired angle for sharpening. A tool rest on which to position the tool during sharpening preferably may be set to the desired angle during sharpening of the tool using a bench grinder or the like.
The present invention provides an angle-adjustable tool rest for use on a bench grinder or other abrading or gridding device. The angle-adjustable tool rest is adjustable at various angles relative to the grinding surface of the grinder or other grinding device. An angle indicator is provided for the tool rest so that the user may determine the angle at which the tool rest surface is disposed. The angle indicator of a preferred embodiment includes a window opening in the tool rest surface through which is visible an angle indicator gauge. As the tool rest is adjusted to different angles, the angle indicator gauge shows the angle of the tool rest to the user.
Referring first to
A tool rest 24 is provided for each grinding wheel 16. The tool rests 24 are affixed to the respective wheel guards 18 by being bolted to the inside surface of the respective wheel guard 18 by mounting bolts 26. The tool rests 24 each include an L-shaped bracket 28 to which is affixed a platform 30. Right and left tool rests 24 are connected to the respective right and left wheel guard 18.
The tool rests 24 are adjustable to move inward or outward relative to the axis of each grinding wheel 16 by loosening the bolts 26 to permit the L-shaped bracket 28 to slide to the desired position. This enables the tool rest 24 to be moved to maintain a desired spacing between the tool rest platform 30 and the grinding wheel 16 as the grinding wheel wears and when a new grinding wheel is mounted on the grinder 10. The tool rest 24 of the illustrated embodiment has an adjustable tool rest platform 30 that may be repositioned at different angles by loosening and then tightening a bolt 32 that connects the L-shaped bracket 28 and the platform 30. The bolt 32 requires use of a wrench for adjusting the position of the platform. Alternative tool rests are possible that are mounted on the bench or affixed to another part of the grinder.
The illustrated bench grinder 10 includes a power switch 34. The bench grinder 10 as shown in
It is foreseen that the tool rest of the present invention may be used on a belt grinder, a disk grinder, or other type of grinding tool. Any type of tool may be provided with the tool rest of the present invention.
An improved tool rest 50 that includes an angle indicator is shown in
A second leg 60 of the L-shaped bracket 52 is affixed to a tool rest platform 62. The tool rest platform is held in position on the L-shaped bracket 52 by a hand bolt 64 that connects the platform 62 to the bracket 52. By loosening the hand bolt 64, the platform 62 may be pivoted relative to the bracket 52 and, once in the desired angular position, held in that position by tightening the hand bolt 64. The user may adjust the angle of the platform to the desired angle without use of a tool or other wrench.
An opening 66 is provided in the tool rest platform 62. The opening is disposed over the end of the leg 60 of the L-shaped bracket 52 to that the end 68 of the leg 60 is visible through the opening 66. The end 68 of the leg 60 is marked with angle indicator marks 70 that are visible through the opening 66 as the platform is pivoted. The user can thereby see the angle of the platform through the opening 66 in the top of the platform 62. The platform includes lines 72 marked or inscribed on its top surface. The lines of the illustrated embodiment are parallel to one another and parallel to the leg 56 of the bracket 52. The user may use the lines 72 to align a tool being sharpened or shaped to the grinding wheel. Other lines on the platform or other shapes of the platform surface may be provided as well. In one example, a groove is provided in the surface of the platform for holding drill bits during sharpening, for example.
With reference to
The end 68 of the leg 60 that is provided with the marks 70 is formed into a cylindrical wall portion. The cylindrical wall portion extends to just below the surface of the platform 62 to provide good visibility of the marks 70 and to reduce parallax between the marks 70 and the indicator mark 74. The underside of the platform 62 is shaped to accommodate the cylindrical wall portion of the end 68.
The hand bolt 64 can be seen extending from the left side of the tool rest 10. For a tool rest provided for a left-side grinding wheel, the hand bolt would extend from the right side and the platform would extend to the left from the L-shaped bracket. The left-side and right-side tool rests may be specifically formed for mounting only on one side of the bench grinder, or may be reversible to fit on either side. For a reversible tool rest, the angle marks 70 may be provided on both sides of the end 68 rather than only to the left side of the end as shown. The angle marks 70 are provided as shorter and longer marks to indicate angular intervals, as is well known.
The bolt 58 in the recess 54 is seen in this view. The head of the bolt 58 is within the recess so as to not to project out of the bracket 52. The bolt 58 may be an Allen head bolt or other similar bolt that does not require access to the outer surfaces to thread the bolt into secure engagement. The recess 54 includes a through extending slot through which the bolt extends into threaded engagement with the grinding wheel cover, for example.
Turning to
The channel 54 in the bracket 52 extends along the leg 56 to permit the screws 58 to be positioned along the channel 54 for adjustment of the bracket position relative to the grinding wheel cover and grinding wheel. Two screws 58 are provided, which pass through the slot that extends along the channel 54.
The bracket 52 has the cylindrical end 68 on which are marked the angle markings 70. The threaded bore 82 is provided along the axis of the cylindrical surface of the cylindrical end 68. Rotation of the platform about the shaft of the hand bolt 64 maintains the position of the angle markings within the opening 66. The underside of the platform 62 is provided with a recess at the opening 66 to accommodate the cylindrical end 68 fitting into position with the angle markings 70 disposed at or just below the surface of the platform 62.
In
The platform 62 as shown has been adjusted to an angle relative to the bracket 52, as can be seen by comparing the leg 56 to the platform 62. The bracket 52 is preferably affixed to the bench grinder or other tool in a horizontal position and the platform is preferably disposed at a vertical position so that when the platform is positioned at a horizontal position, the face of the grinding wheel at the tool rest is perpendicular to the tool rest platform. Adjustment of the angle of the platform 62 to a particular angle, results in the particular angle being added to or subtracted from perpendicular. A tool positioned on the tool rest will be shaped at the angle set by the tool platform.
In the illustrated embodiment, the platform is affixed to one side of the bracket (the left side in the illustrations) and extends over the end of the bracket to the other side (the right side in the illustrations). In an alternative embodiment, the platform is affixed to a side of the bracket to that the platform extends away from the bracket from that side. For example, and with reference to
In a further embodiment, the tool rest platform includes platform surfaces that extend from both sides of the bracket, for example, to both the right and left. The hand bolt may be disposed below one side of the platform surface in this embodiment. The hand bolt 64 may be replaced by a lever, toggle fastener, cam fastener, or other fastener in any of the embodiments described herein.
It is also contemplated that the angle indicator of the present tool rest may be applied to a tool rest that is supported by attachment to the workbench, to a housing of the grinder, to a coolant catch tray, or other support. The L-bracket may be replaced by other support members as required for the alternate tool rest support.
The tool rest 50 includes a visible angle indicator of the position of the platform. The angle indicator is visible from above the platform, so that it is in view while the user is using the bench grinder. In some embodiments, the tool rest 50 includes an opening through the top through which is visible the angle marks on the bracket to indicate to the user the angle of the platform. The tool rest has a cylindrically shaped end of the bracket that indicates an angle to a user relative to a position of the platform.
In an alternate embodiment, the angle markings are provided on the platform member and the indicator or indicator mark is provided on the bracket. For example, a portion of the platform may be shaped with a cylindrical surface portion marked with angle markings that are disposed adjacent an indicator on the bracket.
Thus, there is shown and described a simple and reliable indicator for the angle of the tool rest and a simple and reliable means for adjusting the angle of the tool rest. The user may sharpen a chisel, gouge, scissors, shears, or other tools at a predetermined angle without guessing at the angle or without requiring complex angle measuring devices.
Although other modifications and changes may be suggested by those skilled in the art, it is the intention of the inventors to embody within the patent warranted hereon all changes and modifications as reasonably and properly come within the scope of their contribution to the art.
Number | Name | Date | Kind |
---|---|---|---|
709177 | Schofiled | Sep 1902 | A |
894338 | McLeran | Jul 1908 | A |
1605784 | Schmitt | Nov 1926 | A |
2555707 | Scott | Jun 1951 | A |
2623337 | Falls | Dec 1952 | A |
3436872 | Warren | Apr 1969 | A |
3501871 | Anderson et al. | Mar 1970 | A |
3861088 | Grieco | Jan 1975 | A |
5172484 | Triola | Dec 1992 | A |
6848971 | Doman | Feb 2005 | B2 |
7987608 | Rowe | Aug 2011 | B2 |
20120270479 | Batty | Oct 2012 | A1 |
Number | Date | Country |
---|---|---|
540850 | Oct 1941 | GB |
2007113510 | Oct 2007 | WO |
Entry |
---|
Jet 8-inch Bench Grinder Model JWBG-8. Operating Instructions and Parts Manual. Mar. 3, 2014. [retrieved on Mar. 10, 2014]. Retrieved from the internet, 20 pages. |
Number | Date | Country | |
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20150011143 A1 | Jan 2015 | US |