US1910305A - Sharpening apparatus for razor blades - Google Patents

Description

May 23, 1933. B. G. MONTGOMERY 1,910,305

SHARPENING APPARATUS FOR RAZOR BLADES I Filed Aug. 4, 1950 5 Sheets-Sheet l May 23, 1933. B. G. MONTGOMERY 1,910,305

SHARPENING APPARTUS FOR RAZOR BLADES Filed Aug. 4, 1930 3 Sheets-Sheet 2 May 23, 1933- B. G. MONTGOMERY 1,910,305

SHARPENING APPARATUS FOR RAZOR BLADES Filed Aug. 4, 1930 5 Sheets-Sheet 3 Patented May 23, 1933 UNITED STATES PATENT ori-ICE B GABRIEL MONTGOMERY, OF DJURSI-IOLM, SWEDEN, ASSIGNOR TO AKTIIEBOLl-M-E'll ORYG, OF GOTTENBORG, SWEDENLA-J'OINT-.STOCK COIJILHN'Y` .Y

SHARPENING APPARATUS FOR RAZOR BLADES Application led August 4, 1930, Serial No. 472,986, and in Sweden July 5, 1930 v TheV present invention relates to devices in sharpening apparatus for razor blades or the like of a type where a pivoted blade holder mounted on a stationary shaft is arranged transversely relatively to a sharpening member slidable on a frame, box or the like in such a manner that the blade holder rocks or rotates automatically at the beginning of each stroke for the alternate working of the blade edges when the sharpening member is slid in opposite directions alternately.

The invention has substantially for its object in a sharpening apparatus of this kind to facilitate continuous stropping or honing of double-edged razor blades or the like on both sides of each edge and further to secure a uniform bearing between the edges of the razor blade and the sharpening member at all points and thereby also keen and even edges.

d The invention consists substantially of a motion transmitting device arranged between the sharpening member or a part carrying the same and the blade holder, said motion transmitting means being so devised that the blade holder may be caused to turn also after the sharpening member has been brought out of contact with the razor blade or the like.

The accompanying drawings illustrate two different devices of the present invention as applied to an apparatus formed into a casing or box for holding a safety razor or the like, said boX having a sliding lid carrying the sharpening member.

Fig. 1 is a plan of the apparatus in longitudinal sectional elevation with the lid on. Fig. 2 shows the saine as viewed fromabove; the lid removed. Fig. 3 is a cross-sectional elevation on line 3 3 in Fig. 2. Figs. 4, 5, 6 and 7 show longitudinal sectional elevations of a portion of the apparatus withthe removable stropping member in different positions relatively to the blade during the process of' stropping. Fig. 8 shows a detail of the cover. Fig. 9 is a top plan view of the apparatus according to a modified device; the lid removed. Fig. is an inverted plan of the lid. Fig. 11 is a cross-sectional elevation of the apparatus complete with lid.

In the device shown in Figs. 1-8, a boX or compartment formed from sheet metal is designated by 1, the said box being of a rectangular basic shape its longitudinal side- .walls provided at their upper edges with guide flanges 2 forthe lid 3, which is slidable along the top of the boX and provided with illets 1- embracing the said guide flanges 2. The lid 3 is furnished on its inner surface with aplate 6 provided with a str'opping member 5, the said plate being actuated by two transversal leaf springs 7 attached to the plate and bearing against the lower surface of the lid, so that the plate with the stropping member will be resiliently arrangedvin the lid. The downward movement of the plate is limited by the friction roller 20. The movement of the lid when slid in the direction from left to rght in Fig. 1 is limited by the depending short side 8 of the lid being caused to bear against the corresponding side 81 of the box, as shown in Fig. 1. The movement in the opposite direction is limited by bosses9 at the other end of the lid cooperating with locking pins 10 projecting from the sides of the box. These pins constitute parts of plungers 11 slideable in a pipe 12 and actuated by a spring 13 keeping the locking pins in their `projecting position. To iiX the lid on the boX` or to remove it, the locking pins must be depressed so as to let the bosses 9 pass freely.

Pivotally mounted in the boX 1 and parallel with its crosswise direction is a blade holder 14 for a double-edged razor blade 15 of known type. The said holder has the shape of a rectangular plate, which is plane-surfaced on the one side and provided on the other with clamping springs 16 for the retention of the razor blade to the plate. These clamping springs are constructed so as to permit their insertion into the two outside generally somewhat oblong holes in the razor blade whereupon by displacement of the blade (clownwards in Fig. 2) the clampino' springs are caused toengage over .its surface as shown in Fig. 2. The said blade holder 14 is provided at one end with a small pinion 17 connected through intermediate wheels 18 and 19 mounted on one side of the box with a small gear wheel 2O attached to a friction roller 21 parallel with the blade holder. This roller bears against the stropping member provided in the lid 2 and is caused to rotate or rock in alternate directions through friction against the lid when the latter is slid to and fro along the top of the box. This movement is transmitted through the small toothed gearing to the blade holder 14, so that y the latter rocks or rotates according to the movement of the lid and thereby causes the edges of the razor blade to bear against the resilient stropping member. The blades will then always be stropped with the edges turned in the same direction as the honing member slides.

Connected with the blade holder 14 are two radially projecting arms 22 which, as will be described more fully presently, have for their object in a certain position to bring the blade edge out of contact with the stropping member. During vthe actual stropping operation these arms 22 move freely in a longitudinal slot 23 in the plate 6 carrying the stropping member, whereas at the `end of the one stroke, when the stropping member is about to leave the edge'of the razor blade, the said arms are caused to bear onf an inclined surface 24 formed at the one end of said slot 23 kas will be seen from Fig. 8. At the same end of the lid which is entirely open to facilitate its removal from and replacement on the box'is arranged an abutment 25 in the extension of theV said inclined surface for a purpose to be described more fully below. The arms 22 extend beyond the edges of the blade.

VMoreover, the blade holder 14 is connected with a ratchet disk 26 provided with two diametrically opposed lock teeth cooperating with a resilient pawl 27 fixed in the box.

The box 1 is furnishedwith two clamping springs 28 and 29 serving as retention members for a safety razor 30 of known type intended to be kept in the box. Furthermore, a container 31 for razor blades is formed in the box. y

The apparatus herein described operates as follows.

After the razor blade 15 has been placed in position` on the holder 14 `in the manner previously indicated the lid 3 with the strop 5 is first slid in a direction from left to right, one side of one 'edge being thus stropped, as will appear from Fig. 1. The lid is then pulled back the holder 14 with the blade 15 being rocked into the position shown in Fig.

4 by means of friction on the roller 21 and the toothed gearing 17-20. One side of the other edge is now being stropped. When the lid is pulled further back than shown in 5 so that the blade has no longer contact with the strop the continued friction on the roller 21 rotates the holder 14 with the blade 15 about The backward movement of the lid is limited by the hooks 9 which bear against the locking pins 10 and the holder takes the position shown in Fig. 6. In order to prevent the blunting of the blade at the moment the strop 5 leaves the edge, see Fig. 5, the blade is moved out of contact with the strop immediately before the edge is about to swing past the same by means of one of the arms 22 which slides onto the inclined surface 24 of the slot 23. Y

When the lid is again slid from the position 1n Fig. 6 for the purpose of stropping the other side of the edge last sharpened there will be a tendency when the strop comes into contact with the friction roller 21 to swing the blade holder back in a direction towards theposition shown in Fig. 5. This is prevented however by the ratchet disk 26 which has now been brought into engagement with the pawl 27 as shown in Fig. 6. The blade holder 14 with the blade 15 is thus retained inthe last-mentioned position until, in the first place, the abutment 25 on the lid 3 comes into contact with the now upwardly directed army 22 the holder with the blade being then entrained and swung into the position shown in Fig. 7. vAs stated, .the other side of the edge last sharpened will now be stropped, and when the movement of the lid is again reversed the same side of the edge first sharpened will be stropped. By the lid being moved to and fro and by the blade holder permitting of being rotated also after the strop has` been brought out of contact with the razor blade a continuous and yalternate working of both sides of each edge is thus rendered possible.

If by inadvertency the lid is not moved so far to the left that the locking device for the blade holder comes into operation when the movement of the lid is reversed the holder will be swung back in a direction towards the position shown in Fig. 5 but the arm 22 meets the abutment 25 on the lid thus turning the blade holder in the right direction while at the same time preventing the edge from being blunted by keeping the blade away from the strop until the holder has regained the correct position for stropping.

By the fact that the stropping member is resilient in the direction towards the blade a uniform and superior sharpness is ensured.

This ymay be further improved upon by causing the blade holder with the blade to move crosswise relatively to the direction of the stropping member during the stropping operation.

An embodiment of this type of apparatus is shown in Figs. 9-11. It differs from that killustrated in Figs. 1-8 chiefly in the fact that play is provided in the direction of the axle of the rotatable blade holder 14 the pivots 28 of which extend outside the walls of the boxl and cooperate 'with slanting cams 29 on the fillets of the lid. The guiding of the lid takes place as before by means of the guide ianges 2 on the box. In order to maintain secure engagement between the toothed Wheel 17 and the intermediate wheel 18 when the blade holder 14 with the gear wheel attached to it is moved in its axial direction, the two intermediate wheels 18 and 19 are made wider than the Wheel 17, as will be seen from Fig. 9.

The details of the device may be subjected to alterations in regard to their construction within the scope of the invention. For example, the apparatus, which in the embodiments shown is arranged for the sharpening of razor blades, may also be used, with suitable alterations, for the sharpening of knives otherwise devised. rlhe casing or box may be replaced by a frame, chape or the like, the lid carrying the stropping member consisting of a slide suitably formed for its purpose. The toothed gearing 17-20 that brings the blade holder into operation may be replaced by a suitable friction wheel gearing. The guiding of the plate in the slide or lid and also the spring arrangement in the box may be devised in any suitable manner. Thus for example the springs in the lid 3 may be formed directly out of the material of the plat-e 6, provided always that the plate consists of a thin elastic material. To facilitate the stropping of razor blades or knives devised in some other way the blade holder may be arranged to be exchangeable. Moreover, guide members 22 may be provided at both ends of the blade holder, and the toothed or friction gearings respectively may contain any even number of wheels.

lVhat l claim is 1. A sharpening apparatus for continuous stropping or honing of double-edged razor blades or the like at both sides of each edge, comprising a frame, a. blade holder rotatably mounted in said frame, a friction roller mounted in said frame, the axis of said roller being substantially parallel with the axis of said blade holder, a gearing connected between said friction roller and said blade holder, a sharpening member, means mounting said sharpening member for frictional contact with said roller and for reciprocation with relation to the frame transversely with respect to the axis of said blade holder to thereby rotate the blade holder, said mounting means providing a range of movement of said sharpening member which carries the latter beyond said blade holder when the sharpening member is moved to the end of its stroke in one direction, whereby said blade holder is rotated through said friction roller and gearing when the sharpening member clears the blade in said blade holder, and means for preventing a reverse rotation of the blade holder upon the reversal of the sharpening member at the end of each stroke in the said direction. Y

2. The invention as set forth in claim l, wherein said reverse rotation preventing means comprises a ratchet disc rotatable with said blade holder and a spring-actuated pawl pivotally secured to said frame and engaging said ratchet disc.

3. Apparatus for sharpening both sides of each edge of double-edged razor blades, and

of the type including a frame, a blade holder pivotally mounted onsaid frame, a sharpening member, means mounting the sharpening m-ember on said frame for reciprocating motion, and means actuated by the movement of said sharpening member for rocking said blade holder to present alternatively to the sharpening member those sides of the two edges which are at the same side of a plane passed through the cutting edges, characterized bythe fact that said mounting meansl limits the movement of said sharpening member on one stroke to prevent the same from moving clear of the blade holder and permits the sharpening member to pass beyond said blade holder when moved in the other direction on the next stroke, whereby said blade BO GABRIEL MONTGOMERY.

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