US2120500A

US2120500A - Blade holder

Info

Publication number: US2120500A
Application number: US146076A
Authority: US
Inventors: Makaroff Gregory
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-06-02
Filing date: 1937-06-02
Publication date: 1938-06-14
Anticipated expiration: 1955-06-14

Description

June 14, 193s. AKA FF 2,120,500

BLADE HOLDER Filed June 2, 1937 2 Sheets-Sheet 1' Invento 5 69-9 Mwwg p umm .4 iforneys June 14, 1938. G. MAKAROFF 2,

BLADE I lOLDER Filed June 2, 1937 2 Sheets-Sheet 2 ll," 8 6 T A Z I Q o i I 6 Z4 )4 I 6: ln venior 7 arfidy yf A iiomeys Patented June 14, 1938 UNITED STATES PATENT OFFICE 5 Claims.

This invention relates to a blade holdi ng or clamping means for use in conjunction with grinding tools and for supporting the blades at the desired position of angular adjustment, and in such position of adjustment as will insure proper contact of the beveled edge of the blade with the grinding disk in a manner to afford an almost perfect sharpening of the blade.

The present invention has reference to certain new and useful improvements in that type of blade holding or clamping means forming the subject matter of Patent No. 2,052,837, granted to me under date of September 1, 1936, and entitled Grinding device.

An object of the invention is to provide a blade holder capable of minutest adjustment and which will be found suitable for supporting the blades in contact either with the side or periphery of the grinding wheel.

The invention, together with its objects and advantages, will be best understood from a study of the following description taken in connection with the accompanying drawings. wherein:--

Figure 1 is a side elevational View illustrating the application of the invention when supporting a blade in contact with the periphery of the grinding wheel.

Figure 2 is a similar view illustrating the application of the invention when supporting the blade in contact with the side of the grinding wheel.

Figure 3 is a bottom plan View of the blade holder with certain parts omitted.

Figure 4 is a sectional View taken substantially on the line 4- 1 of Figure 3.

Figure 5 is a fragmentary detail sectional view showing clearly the clamping jaws for securing the blade to the holder.

Figure 6 is a detail sectional view taken sub-= stantially on the line 6-45 of Figure 4.

Figure '7 is a fragmentary plan view showing in section an adjusting screw and in plan a graduated disk; and

Figure 8 is a plan view of a pivoted blockcarrying frame hereinafter more fully referred to.

Referring to the drawings more in detail, it will be seen that in the preferred embodiment thereof the blade holder comprises generally a body member provided with spaced clamps for engagement with the blade to be sharpened for holding the blade in contact either with the periphery of the grinding disk 23 as shown in Figure 1 or with the side of the grinding disk as shown in Figure 2, and the body is equipped with suitable means hereinafter more fully referred to whereby the body of the device may be supported at the desired angle to insure the desired contact with the beveled edge of the blade being sharpened with the periphery or side of the grinding disk 23 as the case may be.

As illustrated the body of the blade clamp and holder consists of a rectangular block of wood or other suitable material and indicated by the reference numeral 5. A pair of strips 24 of metal or other suitable material has the major portions thereof fitting in grooves provided therefor in the underface of the body 5 and extending transversely of the body. The strips 24 are secured to the body through the medium of any number of suitable fastening devices such as screws 25, and at their forward or free ends the strips 24 are rabbeted to form jaws 26.

Cooperating with the jaws 2e are removable jaws 21 which consist of rectangular pieces of metal or the like having down-turned ends 27 overlying the jaws 26 and cooperable therewith for clamping a portion of the blade to be sharpened therebetween. The jaws 2? are illustrated as being removably secured to the strips 24 through the medium of finger screws 28 that thread into suitably aligned openings provided respectively in the strips 24 and jaws 27. To prevent the jaws Zl from rotating relative to the jaws 26 strips 24 on their upper sides are. provided with pins 29 that are engaged in notches 30 provided in the rear end edges of the jaws 21.

In the bottom or underface thereof the body 5 between the strips 24 is formed with a transverse groove, recess or pocket in which is hinged at one end an adjustment plate 3 that normally fits within the pocket, the latter being indicated by the reference numeral 1.

An adjustment screw I0 threads through the body 5 to engage the plate 8, and obviously, by

threading the screw 50 downwardly into engage-- ment with the plate 8 the body 5 and plate 0 may be moved to relative positions of adjustment whereby the body 5 may be adjusted to vary the angular position of the blade during the sharpening thereof without disturbing the set position of the device or blade holder relative to the grinding wheel.

The structure as just described is substantially identical with that forming the subject matter of my aforementioned Patent No. 2,052,837.

In accordance with the present invention there is provided on the side of the body plate 5 a fixed graduated dial H while the adjustment screw i0 is provided with a pointer or index it adapted to be read against the graduations on the dial ll whereby a very minute adjustment of the blade holder may be effected to insure the desired proper contact of the blade with the grinding wheel.

Further, in accordance with the present invention there is provided a frame indicated gen-- erally by the reference numeral 5?. The frame I1 is substantially U-shaped and at the free ends of the sides I8 thereof is pivoted to the body block 5 through the medium of the pivot bolt 9 which also serves as a pivot for the aforementioned adjustment plate 8. Secured to the crossbar IQ of the frame I! is a block 20, the upper side of which is beveled as shown, and this block 20 provides a rest for the plate 8 for supporting the plate at an angle to the horizontal. The frame I! is used, as shown in Figure 2, when it is desired to support the blade 2| to be sharpened in contact with the side of the grinding wheel 23. When it is desired to hold the blade 22 in contact with the periphery of the wheel 23 the frame I1 is swung to the out-of-the-way position, as shown in Figure 1.

As shown, the ends of the blade 22 are clamped between the jaws 26, 21, and in actual practice the initial adjustment of the device is efi'ected by turning the screw ID to place the body block 5 at the desired position of angular adjustment. A more minute adjustment of the body block 5 is had through the medium of the scale plate l3 and the index l5, as is though to be apparent.

Further, by resort to the frame I! and block 20 plate l8 may be supported at an angle to the horizontal so that a wider range of adjustment may be had.

Further in accordance with the present invention there is secured to the plate 8 an arcuate graduated bar 13 that rises from the plate 8 and is provided with a slot l4. Secured to the body block 5 is an index member 15 having an edge thereof adapted to be read against the graduations on the scale bar l3, and carried by the index 15 is a screw I6 that is adapted to be threaded home against the bar l3 for securing the body block 5 at the desired angular position of adjustment.

By using the scale bar 13 in conjunction with the dial ll two or more blades may be sharpened to substantially the same extent so that a uniform sharpening of several blades may be effected with this device.

Having thus described the invention, What is claimed as new is:

1. A blade holder of the character described comprising a substantially flat body, strips secured to the underside of the body and extending transversely thereof, said strips being provided at one end with jaws projecting beyond an edge of the body, removable jaws cooperable with the first-named jaws, means for securing the removable jaws to the strips in operative position to the first-named jaws for clamping the ends of a blade to be sharpened therebetween, and said body being provided on the underside thereof with a recess, an adjustment plate normally arranged in the recess and hinged at one end to the body, an adjustment screw threaded through the body and engaging the adjustment plate, a circular scale plate on said body concentric to said screw, and an index carried by said screw and adapted to be read against said scale plate.

2. A blade holder of the character described comprising a substantially fiat body, strips secured to the underside of the body and extending transversely thereof, said strips being provided at one end with jaws projecting beyond an edge of the body, removable jaws cooperable with the first-named jaws, means for securing the removable jaws to the strips in operative position to the first-named jaws for clamping the ends of a blade to be sharpened therebetween, said body being provided on the underside thereof with a recess, an adjustment plate normally arranged in the recess and hinged at one end to the body, an adjustment screw threaded through the body and engaging the adjustment plate, a circular scale plate on said body concentric to said screw, an index carried by said screw and adapted to be read against said scale plate, an arcuate scale plate extending upwardly from said adjustment plate, and said body plate being provided with a slot to accommodate said arcuate scale plate, an index on said body adapted to be read against the graduations on the arcuate scale plate, and interengaging means on said index and said arcuate scale plate for securing said body block at the desired position of adjustment.

3. A blade holder of the character described comprising a substantially flat body, strips secured to the underside of the body and extending transversely thereof, said strips being provided at one end. with jaws projecting beyond an edge of the body, removable jaws cooperable with the first-named jaws for securing the ends of a blade therebetween, said body being provided on the underside thereof with a recess, an adjustment plate normally arranged within the recess and hinged at one end to the body, an arcuate graduated scale plate extending upwardly from said adjustment plate and through a slot in said body,

and an index mounted on said body and adapted to be read against the graduations on said scale plate in effecting an angular adjustment of the body relative to said adjustment plate.

4. A blade holder of the character described comprising a substantially fiat body, strips secured to the underside of the body and extending transversely thereof, said strips being provided at one end with jaws projecting beyond an edge of the body, removable jaws cooperable with the first-named jaws for securing the ends of a blade therebetween, said body being provided on the underside thereof with a recess, an adjustment plate normally arranged within the recess and hinged at one end to the body, an arcuate graduated scale plate extending upwardly from said adjustment plate and through a slot in said body, and an index mounted on said body and adapted to be read against the graduations on said scale plate in effecting an angular adjustment of the body relative to said adjustment plate, said scale plate being provided with an arcuate slot, and a screw carried by said index and working in said slot and adapted to be threaded home into binding engagement with said scale plate for securing the body at the desired angle of inclination.

5. A blade holder of the character described comprising a substantially fiat body, jaw members provided at one edge of said body for sup porting a blade to be sharpened in substantially spaced parallel relation with one edge of said body, an adjustment plate hinged at one end thereof to the underside of said body, a substantially U-shaped frame including side members pivoted at one end thereof to said body at opposite ends of said body and a cross member connecting the free ends of said side members, and a rest for said adjustment plate carried by said cross member and having a beveled upper surface upon which said adjustment plate is adapted to seat, as and for the purpose specified.

GREGORY MAKAROFF.