US1085267A

US1085267A - Locking device for sharpeners.

Info

Publication number: US1085267A
Application number: US60088111A
Authority: US
Inventors: Crawford M Kanawah
Original assignee: TWINPLEX Manufacturing Co
Current assignee: TWINPLEX Manufacturing Co
Priority date: 1911-01-05
Filing date: 1911-01-05
Publication date: 1914-01-27
Anticipated expiration: 1931-01-27

Description

(LM. KANAWAH. LoGKlNG DEVIGB fox SHARPBNBRS. APPLICATION FILED JAN. 5, 1911.

Patented Jan. 27, 1914.

ffff UNTTED sTaTiis PATENT onirica.'

CRAWFORD M. KANAWAH, OF ST. LOUIS, MISSOURI, ASSIGNOR TO TWINPLEX MANU- FACTURIN G COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

LOCKING DEVICE FOR SHARPENERS.

Specication of Letters Patent.

Patented Jan. 27, 1914.

To (1U w/m/n it muy Concern Be it known that I, CRAWFORD M. KANA- WAH, a citizen of the United States, residing in the city of St. Louis, in the State of Mis souri, have invented certain new and useful Improvements in Locking Devices for Sharpeners, of which the following is a specification.

My invention relates to locking devices for Sharpeners and refers particularly to such devices used in connection with sharpeners for razor blades.

lt is one of the objects of my invention to simultaneously secure a constant predetermined pressure on each edge of the blade, and to accomplish this result I provide a pair of rotatable sharpening elements which, by means of suitable gearing, are rotated in opposite directions.

The blade is mounted in a blade holder, this blade holder rotating through a half turn When Jdie sharpening elements attain certain predetermined positions. In order to allow the blade to rotate, a recess is provided in each of the sharpening elements. My construction is such that the pressure eX- erted b v the blade on the sharpening elements is attained by the resiliency of the blade itself` the axis of rotation of the blade being always the saine.

further object of my invention is to prevent` the possibility of rotation of the blade except when the edges of the latter are opposite the above-mentioned recesses in the sharpening elements and the blade holder is being rotated by means presently to be described. This result is accomplished by the use of a spring actuated paivl or other similar device which preferably engages the pinion associated with the blade holder. When the sharpening elements are in position for the blade to be rotated, the pawl is released from such engagement by means of a cam on a gear sector which is mounted on one of the sharpening elements, this gear sector engaging the pinion on the blade holder to effect the rotation of the latter.

A still further object of my invention consists in so constructing the various parts that the blade Sharpener is capable of ready disassembling. This result is accomplished by mounting the sharpening elements on shafts Which can be readily removed from said elements, these shafts preferably being ln the form of Wood screws which are removably inserted in the sharpening elements. In order to remove the blade holder, I provide a shoulder on the same which is engaged by a friction spring, thereby forcing the blade holder longitudinally in the direction of its own axis and holding it securely in position. lVhen the spring is disengaged from the blade holder, the same may move in the opposite direction a suiiicient distance to disengagc one end of the blade holder from the frame, and the blade holder may thus be readily removed. In order to accomplish this result more easily the aperture in which the end of the blade holder engaged by the friction spring is contained is made slightly larger than the journaled end of the blade holder. The friction spring above-mentioned also has the auxiliary function of preventing-...free rotation of thc blade holder, should there be a slight interval between the disengagement of lthe blade holder pinion by the gear sector and engagement of said pinion by the lockmg pavvl.

ln the above general description of my in-l vention, I have mentioned certain preferred forms of construction to obtain the desired results, but it will be evident to those skilled in the art that these results could readily be attained by changes of mechanical details.

These and other advantages of my invention will be more readily understood by reference to the accompanying drawings which represent a preferred embodiment of my device and in which:

Figure 1 is a plan of the razor bladeV Sharpener. Fig. 2 is an end elevation of the parts shown in Fig. 1, a portion of the frame being broken away to show the interior mechanism. Fig. 3 is a vertical section on the line 3 3 of Fig. l. Fig. 4 is a perspective view of the blade holder and blade adapted to tit therein. Fig. 5 is a partly perspective vievvT and partly longitudinal section through one of the sharpening elements showing the method of attaching the gear associated with each sharpening element. Fig. 6 is a vertical transverse sec tion through the two sharpening elements, the blade holder and the razor blade. Fig. 7 is a' fragmentary longitudinal section through a portion of one of the sharpening elements. ig. 8 is a section similar to that shown in Fig. 6 but with the sharpening elements in a different position.

lportion 31 adapted to fit The frame 15 of the razor blade sharpener has a front wall 16 and a rear wall 17. 0n the front wall 16 are the inwardly projecting

bosses

18, 18 and on the rear wall are the

corresponding bosses

19, 19. The sharpj ening

elements

20 and 21 are located between the front wall 16 and the rear wall 17 and are held in position by means of the

shafts

22 and 23 which preferably consist of wood screws each screw having a threaded portion 24 adapted to engage the threads 25 in the aperture 26, extending longitudinally through each of the sharpening elements. a clutch 27 adapted to be engaged by a similar clutch 28 on the crank 29. The pin 28 extends from clutch member 28 and fits in an aperture in the end of shaft 22. The shaft 23, on the other hand, hasan ordinary screw head 30 ou its front end. The rear end of each shaft consists of a journaled in a suitable openin each of the bosses 19 of the rear Vwall of the sharpener. As most clearly shown in Figs. 1, 5 and 7 each of the sharpening elements on its front end has a portion 32 of somewhat smaller diameter than the main part of the sharpening element. The object of having this portion 32 of less diameter is to allow more ready access to the parts which will later be described.

, Mounted loosely on the shaft 22 and com" ing in contact with the front end of the sharpening element 2O is the gear 33 which3 has a small aperture 34 therein adapted to be brought in register with the pin 35 which is held in the front end of `the sharpening element 20. It will be evident that the pin 35 serves to prevent rotation of-the gear 33 independently of the sharpening element. Similarly a gear 36 is provided at the front ing y end of the sharpening element 21 being held in position by a similar pin 35.

Extending between the front wall 16 and the rear wall 17 is the blade holder 37 having near its front end the pinion 38, but having j a journal portion 39 which has its bearing in the front wall 16 of the Sharpener. s most clearly shown in Fig. 4, the main portion of the blade holder is recessed to form the fiat surface 39a through most of its length, the

pins

40, 40 projecting upwardly from this flattened surface.' The clamping member 41 hinged at 42 is adapted to be brought into engagement with the flattened portion 39, the

apertures

43, 43 registering with the

pins

40, 40. The rear end of the blade holder 'has a journal 44 slotted-at 45, the extension 46 of the clamping member`41 being adapted to lit in the slot 45 when the clamp 41 is brought into closed osition. It will now be apparent that the blizide 47 may be placed on the flattened portion 39 of the blade, holder and securely held thereon by' fits, The shaft 22 has on its front end j closing the clamping member 4.1.

A spring 48 is fastened to the rear wall 17 of the sharpening member and at its free end is the curved portion 49 adapted to engage the journal 44 of the blade holder 37 and also to abut against the shoulder 5() of said blade holder, thereby preventing the latter from moving toward the rear in the direction of its longitudinal axis. The locking member 51 is pivoted at 52 to the rear wall 17 and engages the top of the journal 44 of the blade holder 37. The aperture in the rear wall 17, in which the journal 44 is somewhat larger than this journal allowing movement of the same in a vertical plane, and thus making it possiblel to readily swing the locking member into its inoperative position, vWhen this is done, it will be evident that the clalnping member 41 may be readily raised by its extension 46 and the blade 47 may either be removed from the bla-de holder or placed in position therein.

As best shown in Fig. 3, a pawl'53 `is l pivotally mounted on the front wall 16 at 54 and is `normally held in engagement with one of the teeth of the pinion 38 by means of the spring 55: The pawl 53 is preferably made in the form of a bell-crank having the extending arm 56. Mounted on the gear 33 is a gear sector 57 adapted to engage the teeth of the pinion 38. This gear sector also has a cam surface 58 adapted to engage the arm 56 of the pawl 53, thereby removing the latterfrom engagement with the pinion 38.

Each of the

sharpening elements

20 and 21 has a recess 59 in its periphery, the purpose of which will be explained hereafter. Each sharpening element is also covered with a strop 60 of leather or other similar material.

One of the advantageous features of my invention is the readiness with which 'the various parts can be disassembled. In order to accomplish this it is only necessary to first move the locking member 51 out of its operative position and to'then. depress the upper end of the spring 48. `This being done, the blade holder 37 may be moved to the rea-r` until the shoulder 50 comes in contact with the rear wall 17 thereby removing the journal portion 39 from its engagement with the front wall 16. The blade holder may then readily be removed by first raising the front end of the same and then withdrawing the rear end from the rear wall 17. The neXt step consists in removing the

shafts

22 and 23 by unscrewing the same f from the sharpening

elements

20 and 21 respectively. This being done the sharpening elements' may themselves readily be removed fromthe frame 15.

` The operation of my improved razor blade sharpener maynow" be readil understood. The gear 33 is in mesh with t e that as the sharpening element 20 1s rotatejl,v f

by means of the crank 29, the sharpening element 2l will be simultaneously rotated in the opposite direction. The blade 47 having already been placed in position in the blade holder as previously explained, it Will be evident, as most clearly shown in Fig. 8, that the edges of the blade are held in contact 'with the strop 60 of the sharpening elements by the resiliency of the blade itself. lVh en the sharpening elements 20 and 2l have been turned to such a position that the recesses at 59 approach the edges of the blade 47. the radius of each of the sharpening elements is gradually decreased as shown at (3l in order to prevent a sudden release of pressure of the edges of the blade. When the sharpening elements have been rotated sufciently so that the recesses 59 are opposite the edges of the blade 47, the cam surface 58 engages the arm 56 of the pawl 53, thereby freeing the latter from its engagement with the pinion 58, and the gear sector 57 then engages and rotates the pinion 3S through a half revolution, thereby causing the blade 47 to turn Within the recesses 59, and bringing the opposite surfaces of the edges of the blade into position to be engaged by the strops 60 of the sharpening elements. It Will be evident that as soon as the gear sector 57 is freedfrom engagement with the pinion 38, the Iatter is positively locked in position by the pawl 53, rotation during the slight interval Which may occur being prevented by the spring 48.

It Will be clear to those skilledin the art that many changes could be made in the preferred form of razor blade Sharpeners which I have described Without departing from the spirit of my invention.

That I elainiisrl. In a razor blade Sharpener, the combination of a pair of sharpening elements ha ring recesses in their peripheries, means tor rotating said sharpening elements, means for holdingr the blade to be sharpened, a spring actuated locking pawl engaging said blade-holding means during contact of said blade with said sharpening elements, and means for releasing said paWl When said blade is freed from contact With said sharpening elements, thereby permitting rotation of the blade Within the recesses in said sharpening elements, substantially as described.

2. In a razor `blade Sharpener, the combination of a pair of sharpening elements having recesses in their peripheries, means for rotating said sharpening elements, a rotatable blade holder having a pinion mounted thereon, a spring actuated locking pawl engaging said pinion during contact of said blade with said sharpening elements, means for releasing said locking pawl from said pinion when the recesses in said sharpening elements are brought opposite the edges of said blade, and means engaging said pinion for rotating said blade holder, thereby rotating said vblade Within the recesses of said sharpening elements, substantially as described.

3. In a razor blade sharpener, the combination of a pair of sharpening elements having recesses in their peripheries, gears mounted on said sharpening elements and in mesh with each other, means for rotating said sharpening elements, a blade holder for retaining the blade to be sharpened, a pinion mounted on said blade holder, a spring actuated locking pawl normally engaging said pinion, means for releasing said locking pawl when the recesses in said sharpening elements are brought opposite the edges of said blade, and a gear sector mounted on one of saidgears for enga-ging said pinion and rotating said blade holder during the release of said locking paWl,Whereby the blade is correspondingly rotated within said recesses and the opposite surfaces of said blade brought into contact with said sharpening elements, substantially as described.

4. In a razor blade Sharpener, the combination of a pair of sharpening elements having recesses in their peripheries, means for rotating said sharpening elements, means for holding the blade to be sharpened, means for rotating said blade holding means, a spring actuated locking pawl normally engaging said blade holding means, and means for releasing said locring pawl from said blade holding means during engagement of the latter by said rotating means for said blade holding means, substantially as described.

5. In a razor blade Sharpener, the combination of a pair of sharpening elements having recesses in their peripheries, means for rotating said sharpening elements, a holder for retaining a blade to be sharpened, means for rotating said blade holder When the edges of said' blade are Within said recesses, a spring actuated paWl for normally locking' said blade holder against rotation, and means for releasing said pawl when said blade y holder is engaged by its rotating means, sub- `stantially as described.

CRAWFORD M. KANAWAH.

Witnesses:

THOMAS M. CAUBLER, W. A. RmDIoK.