US909707A - Cutlery-grinder. - Google Patents

Description

H. E. SWEET. I GUTLERY GBINDEB. APPLICATION FILED MAY 19, 1908.

909,707. {Patented Jail. 12,11909.

ISA as Clttognu,

- the blade.

HOMER E. SWEET, OF PORTLAND, OREGON.

CUTLERY-GRINDER.

Specification of Letters Batent.

Patented Jan. 12 19091 Application filed May 19,-1908. Serial No. 433,725.

T all whom it may concern:

. Be it known that I, HOMER E. SWEET, a citizen of the United States of America, residing at Portland, in,the county of Multnomah and State of Oregon, have invented new and useful Improvements inCutlery- Grinders, of which the following is a speci-.. ficat-ion.

This invention relates to cutlery grinders, and one of the principal objects of the same is to provide a simple and efficient machine ofcompa-ratively few parts which may be used by an unskilled person for grinding knives, scissors or other cutlery.

Another object of the invention is to provide a cutlery grinder which may be either operable by hand or by means of a motor and which will hold the blade to be ground at any desired angle to the grinding surface inorder to give the desired bevel to mit the operator to withdraw the blade at .any time without changing the bevel when reinserting the knife or other tool.

These and other objects may be attained by means of the construction illustrated in the accompanying drawing, in which,--

Figure 1 is a side elevation .and partial section of a cutlery grinder made in accordance with my invention. Fig. 2 is a frontelevation of the same. Fig. 3 is a top plan view of the work holder. Fig. 4 is a side elevation and partial section of a portion of a machine showing a modified form of work holder.

Referring to the drawing for a more specific description of my invention, the numeral 1 designatm the machine frame comprising a base arm 1, through which a binding screw 2 passes and a table 3 and an upright arm 4 for supporting the operative mechanism. This frame is adapted to be clamped to a table or other support by means of the bindin screw 2. j

- ounted in the upper endof the arm a is a shaft 5 to one end of which a small gear wheel 6 is attached, said shaft extendrngthrough a suitable journal bearing 7, and secured to the other end of said shaftis a grind stone 8 formed in the shape of a ring provided with an internal angular flange!) which is clamped between a disk orpl-atelO and a face plate 11 by means of a screw 12 applied to the threaded end of the shaft 5.

The main shaft 13 is journaled in the upright portion 4 of the frame at one end and in a bracket 4" rising from the opposite portion of the table 3.

Referring now to Figs. 1, 2 and 3, the work holder is shown as mounted upon the main shaft 13, said work holder com rising the two lugs 14 and 15 through which the shaft 13 freely passes, said lugs having each a groove 16 therein to receive the head 17 .of

a set screw 18 fitted into a threaded opening.

in the table 3 and adjustable to secure the work holder in adjusted positions. Extending upwardly at an inclination is the work holding arm 19, 'said arm having an upwardly extending supporting member'20, said member 20 having a slot 21 therein through which a spring 22 extends, said spring being secured at 23 to the outer end of the table 3. For holding a scissors blade in place to be ground I utilizethe curved spring 24, said spring being secured by rivets 25 to the member 20.

For adjusting the back portion of a knife blade to give the required bevel to said blade while being ground I utilize an adjustable gage 26 which is adjusted by means of the set screw 27 which passes through a slot 28 in a lug formed upon the Work holder, as shown more particularly in Figs. 1 and 2.

Secured to the frame 1 by means of the shaft 13, is the main grinding gear 29 which meshes with the small gear 6- and is provided with a suitable crank30 provided with a handle 31. v

The operation of my invention thus far described may be briefly set forth as follows :-A knife or blade (in is placed in the machine, as shown in'Fig. 1, and held by one hand, while the other hand may be used for turning the crank 30: The bevel at which it may be' desired to grind the blade a may be attained by means of the gage. 26.-

It will be understood that the free'movement of the work holder on the shaft 13 allows said holder to adapt itself to any thickness required without danger of altering the degree of bevel to be ground upon the blade.

As shown in Fig. i, the curved spring 24 holds a scissors blade I) in position up to the rind stone 8. The work holder 32 shown in this figure is of slightly modified form,

since in place of the adjustable ga 'e an inte'gral lng 38 is shown. The wor holder 0t erwise is "substantially like the one shown in Fig. 1 and is held in place by a set screw *18 of substantially identical structure.

From the foregoing it will be' obvious that a grinding machine made in accordance with my invention will be found useful in households, hotels and other places where cutlery may be ground by unskilled persons, and that the machine may be manufactured and sold at a low price and will operate quickly said frame meshing with the gear wheel on the grind stone shaft, a Work holder, an arm for caring against the blade to be ground, an adjustable gage and a set screw for securing the work holder in adjusted position.

2. In a machine ofthe character described, and in combination with a rotary grind stone, a work holder comprising an inclined arm to bear against the blade to be ground,

an outwardly extending slotted member,

and a spring secured to the frame of the machine and extending through said slotted member, and a set screw for securing said work holder in position.

3. In a machine of the character described, and in combination with a rotary grind stone, a Work holder mounted upon a shaft and provided with grooved lugs, a set screw mounted in the frame and having a head to engage the grooves in the lugs, an upwardly inclined arm for bearing against the blade to be ground,.a lug 83 adapted to throw the knife to the proper bevel against the stone, an outwardly extending holding member having a slot therein, a spring secured to theframe of the machine and extending through said slot, and a curved spring secured to said slotted member.

4. In a machine of the character described, and in combination with a rotary grind stone, a work holder, means for securing said work holder in adjusted positions, an inclined arm on said work holder, an ,out-

wardly extending supporting member pro-' vided'with a slot, a spring secured to the frame of the machine and extending throu h said slot and a curved spring blade holc er secured to said supporting member and adapted to hold a scissors blade up to a grind stone, substantially as described.

In testimony whereof I afiix my signature in presence of two witnesses.

HOMER E. SWEET.

\ lVitnesses:

R. C. HAmiMAN, M. J. Kincs'ron.

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