US1811069A - Grinder - Google Patents

Description

June 23, 1931. E. L. WEBB 1,811,069

GRINDER Filed June 10, 1929 Patented June 23, 1931 UNITED STATES EDWARD L. WEBB, or was: LIBERTY. rows GRINDER Application filed June 10, 1929. Serial No. 369,838.

This invention relates to grinders, and more particularly to such as are used for grinding scissors and other small tools common to households, barber-shops and the like.

The principal object of the invention is to provide a grinder easily and quickly ad ustable, and with a controlling guide, whereby a pair of scissors may be accurately ground to any desired angle of cut.

In the grinding of ba-rbers shears it is the general practice to grind one blade at about the angle proper for cloth-cutting, and the opposing blade at a much more acute angle. This is mainly to prevent the clipped hair from flying unduly, to the inconvenience of either the barber or his customer. It is therefore desirable to provide means for grinding the shears which will insure a fair degree of accuracy in the grinding, and give to the blades the requisite angles.

In the accompanying drawings, forming a part of this specification, Fig. 1 is a side elevation of a grinder embodying the invention. Fig. 2 is a front elevation of the same, as in use. Fig. 3 is a fragmentary plan view, showing the mountingof the shear guide on the operating motor. Fig. 4 is a sectional view showing details of the guide mounting, with a special device for holding the shear guide in guiding position. Fig. 5 is a fragmentary plan view, showing means for regulating and determining the angle of the grinding wheel with respect to the shear guide. 7

In the drawings, the numeral 5 denotes a base-block (herein shown as wood) to serve as a support for a small electric motor 6. The connection is a hinge 7, screwed to the motor and base at 8 and 9, respectively.

Above the base is mounted a slide-block 10 by a bolt 11 provided with a thumb-nut 12, the block being slotted at 13 for the bolt. This block is also shown herein as of wood. To the block is attached a double-jointed hinge 14, the opposite leaf of which connects with the motor. Screws 15 and 16 connect the respectiveparts. It will be evident that the sliding of the slide-blockwill tilt the motor as desired. Near the slide-block the base is graduated at 17-, and an adjacent pointer 17 a on the slide block serves to indicate positions definitely A thin, flat abrasive wheel 18 is attached to themotor shaft, its flat upper face being designed to serve as the grinding surface.

On the upper end of the motor casing is mounted a bracket 19 by screws :20 and 21. The vertical portion of the bracket is slotted at 22, and in the slot is set a screw-shanked pivot-head 23 by tightening nuts 24: and 25. The former may be 'a' fixed headfor" the shank, and the pivot-head be loosened and tightened by the othersc rew, which has a milled head25a so that it may be used as a thumb-nut. To the fiat head of the pivot member is attached a fiat blade 26, so that the blade may be swung to a horizontal position, as shown in Fig. 2, or made to depend vertically, as in Fig. 1. In the latter position it serves as an auxiliary to the angle gauge above described. With the pivot member loosened the blade will automatically hang vertically while the motor is set to any de sired angle. The pivot member being then clamped to the bracket, the blade is turned outwardly to the position shown in Fig. 2, and still remains vertical cross-wise. In this position it serves as a flat guide for the inner face of the depending blade of the shears 27 which being held closely against the face of the guide, and slid. therealong, necessarily gives accuracy to the grinding of the other blade applied to the grinding face of the wheel.

If it is desired to grind the other blade of the shears at another angle, the guide is turned to vertical position, the pivot member loosened, the angle of the motor shifted as desired, and as above described, and the guide finally re-set at the horizontal position.

The fastening of the guide to the pivot member may be a simple bolt and thumb-nut 28, as shown in Fig. 1. For quick shifting of the guide,- however, it is preferred to notch either the blade or the pivot-head at 29, and provide a corresponding nib 30 on the other member, which will engage when the guide is horizontal. A spring 31 under the thumbnut allows the guide to shift, and snaps it in place at the desired position.

Having thus described my invention, I claim:

1. In a grinder, a motor carrying a flatfaced grinding wheel, a base pivotally connecting with the motor, means adapted to tilt the motor and fix it in tilted positions, a pivoted laterally disposed guide support adjacent to the wheel, a flat-faced guide hung from said support, and fastening means adapted to secure the guide in a position radial to the wheel, with its guiding face at an angle to that of the wheel.

2. In a grinder for scissors and the like, a

motor carrying on its spindle a flat-faced grinding wheel, a base pivotally connecting with the motor, means for tilting and fixing the motor in position, a bracket disposed on the motor back of the wheel, a guide support in pivotally adjustable connection with the bracket, a fiat-faced guide pivotally connecting with the support at one end, cooperating detents to hold the guide in an extended lateral position, and a spring cooperating with the guide, detents and guide pivot means, whereby the guide snaps into proper guiding position when turned upwardly and outwardly. V

In testimony whereof I affix my signature.

EDWARD L. WEBB.

Images