US1441030A

US1441030A - Knife-sharpening machine

Info

Publication number: US1441030A
Application number: US521413A
Authority: US
Inventors: Rudolph Alfred William
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-12-10
Filing date: 1921-12-10
Publication date: 1923-01-02
Anticipated expiration: 1940-01-02

Description

A. vv. RUDOLPH.

KNIFE SHARPENING MACHINE;

FILED DEC.10 1921.

3 f/g/ Wag we.; v y, f: 1 rse 'N reiterated exlan .23, ledit.,

ALFRED WILLAll/ RUDOLPH,

OF ST. LGUIS, MISSOURI.

KNIFE-SHARPENNG TEACHENE.

Application filed December 10, 1921.

To @ZZ w 7mm t may concern Be it known that l, ALFRED YV. RUDOLPH, a citizen of the United States of America, residing at St. Louis, in the State of Missouri, have invented a new and useful Knife-Sharpening Machine, of which the following is a specication.

The prime object of this invention is the provision of a simple, durable, inexpensive and eficient machine by which steel knives may be quickly sharpened throughout the entire length of the blade and in which the sharpening material may be quickly replaced when worn.

Referring to the accompany'uig` drawing, wherein like numerals refer to like parts throughout, Figure 1 is a plan view of one side of the machine as the same appears when suspended upon a wall; Figure 2 a front elevation depicting` the insertion of a knife between the sharpeningl surfaces; Figure 3 a plan view which is the reverse of Figure 1; and Figure 4 a sectional view taken along line 1 4 of Figure 1.

1 indicates a wooden block having apertures 2 for the reception of hooks when the machine iS hung upon a wall, and secured to said block is a substantially oblong box comprising side-walls 3, front-plate f1- provided with a slot 5 and bottom-plate 6 Ywhich also has a slot 7.

Disposed within said box a reciprmalli," movable plate 8 having a dowir-tiuned flange 9 projecting thi-(nigh slot T and lugs 10 adapted to engage springs l1` the latter being` secured to lugs 12 of plate #l and serving to retract plate S after removal of the knife from the sharpening surfaces. The forward edge of plate 8 projects through slot 5 of front plate l and is provided with extensions 13 against which the sharpening stones 14- are held by detachable plates 15 secured by screws 16. rifhe forward edge of bottom-plate 6 is provided with four substantially triangular-shaped extensions 17 which are similar in appearance to scissorblades and the additional set of stones 18 are retained thereagainst by detachable plates 19 (of corresponding shape) fastened by screws 20.

Serial No. 521,413.

An arm 21 pivotally fastened at 2Q to plate -1 serves to support a holder 223 for a pad 2st of absorbent material saturated with oil and the knife blade is preferably drawn over said pad before and after sharpening. lV hen the machine is not in use, said arm may be turned inwardly upon its pivot and a suitable cover (not shown) placed over the whole.

Finally it should be noted that one set of the sharpening stones may be comparatively coarse so as to prepare the blade for the finishing action of the other set of less abrasive material, and that, in distinction to certain other devices of the same general character, the construction of this machine is such that the entire length of the knifeedge may be sharpened.

1n using the machine the knife blade 25 is inserted within the space A (Figure 1) so as its cutting edge rests against one of the immovable stones affixed to plate 6 and one of the movable stones carried by plate 8. rEhe blade is then pressed downward and simu taneously drawn toward the operator, thereby forcing plate S from left to right against the resistance of springs 11 which serve to return said plate to its original position immediately upon removal of the blade.

lllhat l claim as new and desire to secure by ,lLetters-llatent is l., koi'fe-sl'iarpeuer comprising a reciprocally movable member` a plurality of sharpening stones secured thereto, an irnmovable plate positioned opposite said stones.. and a plurality of similar stones affixed to said plate, the stones of said mein# ber being spaced apart at their base f id converging at their upper extremities, and the stones of said plate being juxtaposed at their base and diverging upward, whereby a substantially 1f-shaped channel is provided between the sets of stones for the insertion of a knife-blade.

2. rl. knife-Sharpener comprising a reciprocally movable member, a plurality of sharpening stones secured thereto, an immovable plate positioned opposite said stones and a plurality of similar stones af-