US2733554A - Jointer blade sharpener - Google Patents

Description

7. 1956 R. E. STARNES JOINTER BLADE SHARPENER Filed Jan. 19, 1954 Roy E. .Sfames INVENTOR.

BY Wavy 3% i W ylli' United States Patent 2,733,554 JOIN 'IER BLADE SHARPENER Ray E. Starues, Mitchell, Dalr. V

Application January 19, 1954, Serial No. 404,857

1 Claim. (01.51 122) This invention relates to a jointer blade sharpener and more specifically provides an attachment for positioning jointer blades for sliding movement across the face of a moving abrasive member for sharpening the blades.

An object of this invention is to provide a jointer blade sharpener for attachment to a table having a tiltable and rotating abrasive member projecting through a slot therein for sharpening the blades.

Another object of this invention is to provide a jointer blade sharpener having a movable jointer blade holder for adjusting the jointer blades towards and away from a moving abrasive member.

A further object of this invention is to provide a jointer blade sharpener having a slidable blade holder and handles thereon for moving the jointer blades across a moving abrasive member at the correct angular relation thereto.

A still further object of this invention is to provide a jointer blade sharpener which is simple in construction, easy to assemble, easy to attach to existing power tools, relatively inexpensive to manufacture, accurate in operation and well adapted for its purposes.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a perspective view of the jointer blade sharpener of this invention attached to the table having a rotatable abrasive member associated therewith;

Figure 2 is a detailed perspective showing the jointer blade holder bar of the present invention;

Figure 3 is a transverse, vertical section taken substantially along section line 3-3 of Figure 1 showing the structural relationships of the various components of the jointer blade sharpener of the present invention; and

Figure 4 is a detailed, longitudinal section taken along the center line of the guide rail and elongated member showing the manner of adjusting the guide rail and the elongated bar towards and away from the rotating sander or abrasive member.

Referring now specifically to the drawings, it will be seen that the numeral generally designates the jointer blade sharpener of the present invention. The jointer blade sharpener 10 is attached to a table 12 having a supporting span 14 thereunder and a slot 16 in the upper surface thereof for receiving a rotating member 18 having an abrasive surface 20 on one side thereof. The rotating member 18 is driven through a suitable mechanism 22 and is tiltable in relation to the table 12 by suitable means actuated by the handle 24. This structure is conventionally found in bench saws or the like, and the saw may be removed and replaced with the element 18 with the abrasive surface 20 for sharpening jointer blades indicated by the numeral 26.

The jointer blade sharpener 10 includes an elongated bar 28 having a longitudinal groove 30 along one edge thereof facing the abrasive surface 20. The other edge of the elongated bar 28 is provided with a longitudinally extending flange 32. A pair of clamp bolts 34 are threaded into one of the flanges forming the groove 30 and contact each jointer blade 26 for securing the jointer blades 26 rigidly in the groove 30 with the bottom of the jointer blades 26 rigidly positioned against the bottom of the groove 30. The bottom flange forming the groove 30 is generally tapered, as indicated by the numeral 36 in such a manner so that the jointer blade 26 may be ground even when the tapered edge of the jointer blade 26 is coextensive with the tapered portion 36 of the bar 28. An elongated guide rail 38 is positioned over the flange 32 and abuts the rear edge of the bar 28 in sliding contact therewith wherein the elongated bar may be moved along with the jointer blades 28 across the abrasive face 20 of the rotating member 18 by utilizing the upstanding handles 40 on the upper surface of the elongated bar 28. An elongated member 42 is secured to the table 12 by suitable C-clamps 44 which removably secure the member 42 in parallel and opposed relation to the abrasive surface 20. The elongated member 42 is provided with a pair of spaced bolts 46 in screw threaded engagement with bores 48 in the elongated member 42 and in abutting engagement with the guide rail 38. Another pair of bolts 50 journaled in apertures 52 in the elongated member 42 and screw threaded in bores 54 in the guide rail 38 are utilized for adjusting the relation of the guide rail 38 and the elongated member 42. By selective rotation of the bolts 46 and 50, the guide rail 38 may be moved towards and away from the abrasive surface 20, thereby determining the contact pressure between the jointer blades 26 and the abrasive surface 20.

The operation of the device will be readily understood. After the elongated member 42 and the guide rail 38 have been secured to the upper surface of the table 12 by use of the C-clamps 44, in accurate parallel relation to the abrasive surface 20, the abrasive surface 29 is tilted to the correct angular relation by utilizing the handle member 24 in an obvious manner. The guide rail 38 is in position over the flange 32 and engaging the rear surface of the bar 28, thereby providing a guide for the sliding movement of the bar 28. With the jointer blades 26 secured in the groove 30 by the thumb clamp screws 34, the blades 26 may be sharpened by moving the bar 28 and the blades 26 across the face of the abrasive surface 20 while the member 18 is rotating. If it is desired to grind the blades 26 to a finer edge, the bolts 50 may be loosened a desired amount and the bolt 46 turned inwardly, thereby forcing the guide rail 38 towards the abrasive surface 20, thereby forcing the jointer blades 26 to engage the abrasive surface with more pressure and grinding the jointer blades 26 to a finer and keener edge. It will be seen that this device may be easily and quickly attached to any conventional saw table and the table 12 may tilt as well as the rotating member 18. Obviously, the various elements and components of the pres ent invention may be constructed of readily obtainable stock material, thereby enhancing the economic feasibility of the device.

From the foregoing, the construction and operation of the device will be readily understood and further explanation is believed to be unnecessary. However, since numerous modifications and changes will occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the appended claim.

What is claimed as new is as follows:

A jointer blade sharpener for attachment to a table top having a rotatable abrasive member with a flat side surface associated therewith, said sharpener comprising an elon gated flat bar slidablypositioned on the upper surface of the table for movement in parallel. relation. to the flat side surface of the abrasive member, a groove extending throughout the length of one side edge of. the elongated bar for receiving a plurality of jointer blades, clamp means for securing said blades in said groove, handle means on said bar for, movement. thereof, a flange along the other side edge of the bar slidably engaging. the table top, a guide rail movably mounted on the table top and engaging the flange for restraining vertical-movement of said bar, and means for adjusting. the position of said guide rail thereby adjusting the path of movement of. the bar and blades across the side of the abrasive member.

References Cited in the file of this patent UNITED STATES PATENTS 182,284 Otis .Sept. 19, 1876 1,354,456 Milligan Sept. 28, 1920 1,385,649 Sherman July 26, 1921 1,872,096 Runshang Aug. 16, 1932 1,980,872 Moul Nov. 13, 1934 2,052,837 Makaroff Sept. 1, 1936 2,579,680 Leighton Dec. 25, 1951 2,636,326 Rivard Apr. 28, 1953 FOREIGN PATENTS 615,617 France Oct. 16, 1926 OTHER REFERENCES Popular Mechanics, volume 97, May 1952, pages 195- 198.

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