US2032999A

US2032999A - Safety razor

Info

Publication number: US2032999A
Application number: US14346A
Authority: US
Inventors: Jacob M Moses
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-04-02
Filing date: 1935-04-02
Publication date: 1936-03-03
Anticipated expiration: 1953-03-03

Description

March 3, 1936. J M MQSES 2,032,999

SAFETY RAZOR Filed April 2, 1955 I ll %/ 3mm I 75 Jacob MM Patented Mar. 3, 1936 UNITED STATES PATENT OFFICE- 8 Claims.

This invention relates to safety razors of the wafer blade type. It proposes the construction of a razor characterized by simplicity, efficiency and versatility in that the inventive principle is equally adapted to razors of the straight or hoetype.

' One of the objects of the invention is to provide a razor in which the blade is maintained in planar state whereby breakage due to distortion of the blade is avoided and a higher temper can therefore be given to the blade.

Another object of the invention is the construction of a razor consisting of two parts only, the frame and a complementary clamping memher slidable into congruent relation to a part of the frame and automatically clamping the blade :/.-,'in position. I

A further object of the invention is to provide cooperating means on the frame and slide for wedgingly holding said members clampably together upon the intervening blade as the slide is pushed into place, the wedging means including oppositely inclined surfaces at opposite ends of the blade for distributing the clamping pressure uniformly along the length of the blade.

Still another object of the invention is the provision of a razor in which the slide or bladecarrying member can be ejected with the blade, for washing or for replacement of the blade, by slight pressure of the thumb of the same hand which holds the frame, without the need of undoing any fastening means.

Other objects of the invention will appear as the following description of preferred and practical embodiments thereof proceeds.

In the drawing which accompanies and forms a part of the following specification and throughout the several figures of which the same character of reference have been employed to designate identical parts:

Figure 1 is a plan view of a razor of the straight type embodying my invention, and viewed from the shaving side;

Figure 2 is a plan view of the same razor viewed from the opposite side;

Figure 3 is a cross section taken along the line 3-3 of Figure 1;

Figure 4 is a longitudinal cross section taken along the line 4-4 of Figure 1, showing the slide andblade in fully clamped position;

Figure 5 is a similar View showing the slide and blade in partially clamped position;

Figure 6 is a vertical section through a razor of the hoe-type, embodying the principles of the invention;

Figure 7 is a plan view of the razor shown in Figure 6, viewed from the shaving side;

Figure 8 is a longitudinal section through the razor shown in Figure 6, and showing the slide disassembled therefrom, but being in position to slide horizontally into clamping relation to the frame; and

Figure 9 is a plan view showing the blade.

Referring now in detail to that form of the invention shown in the group of Figures 1 to 5, inclusive, the numeral I represents the frame of a razor of the straight type extended longitudinally at one end to form the handle 2 and broadened at the opposite end to form a guard member 3 having the guard teeth 4 along its opposite longitudinal edges. The guard member 3 is formed with a slot 5 extending for about half its length and the surface of the upper side of the guard member along the edges of the slot is depressed inclinedly from the inner end of said slot towards its outer end forming a wedging plane 6 cooperable with the slide 1. The exposed side of the slide is preferably formed with bevels 8 defining with the guard teeth 4 the proper shaving angle as will be clearly understood from Figure 3, and the slide has a stud 9 with its base embedded or otherwise anchored in the slide and a shank l0 extending from the inner or blade-carrying side of the slide, and having a head ll. Lengthwise of the slide on opposite sides of the stud 9 are upstanding ribs l2 and I 3 which pass through the slot in the blade and fix the latter in position on the slide.

The slide 1 is adapted to cooperate with the lower face of the guard member 3 with the blade intervening. In assembling the parts, the blade is placed upon the slide, the head of the stud 9 and the ribs [2 and I3 passing through the slot in the blade. The slide carrying the blade is then presented endwise to the frame, and the two members slidably pushed together, the shank of the stud passing through the slot 5 and the head of the stud gradually rising upon the inclined plane 6, drawing the slide and blade tightly against the under-surface of the guard member. It will readily occur to one skilled in the art that the head of the stud will tend to arrange itself parallel to the inclined plane 6 and that since the stud and slide are rigidly related, this would bias the outer end of the slide in the direction away from the guard member concentrating the clamping pressure upon the blade at the inner end of the slide. This might cause a certain looseness adjacent the outer end of the blade particularly if the frame were not absolutely rigid, resulting in impairing the safety feature of the razor and causing the razor to cut the face. In order for the slide to arrange itself absolutely parallel to the lower face of the guard member and thus to distribute the clamping pressure throughout the entire length of the blade, the underside of the guard member is provided with a groove I4 having an inclined bottom I5, said groove starting substantially at the inner end of the slot 5. One of the ribs I3 or I2 coacts with theslanting bottom I5 of the groove I4. The clamping action is clearly illustrated in Figures 4 and 5.

Figure 4 shows the stud 9 slightly tipped with its head Il bearing against and parallel to the inclined plane 6. The resulting space I6 in exaggerated form can be noted between the blade and the guard member, which even though it progressively diminishes as the slide is pushed into position would still cause the clamping pressure to be concentrated at the inner end of the blade. Figure 4 shows however, that as the stud approaches the elevated end of the inclined plane 6, the rib I3 rides upward upon the slanting bottom I5 of the groove I4, tending to tilt the slide and blade in the opposite direction so that by the time the blade is in the fully clampedposition shown in Figure 5, any tendency to looseness at the free end of the blade has been entirely counteracted by the opposite tilting effect produced by the co-action between the rib I3 and the bottom of the groove I4. Thus, the clamping pressure is uniformly distributed.

Referring now to the group of Figures 6 to 9 inclusive, the invention is shown applied to a hoe-type razor. The end member I! may be similar to the slide 1 shown in the first described form of the invention, but the head of the stud 9 has grown into a handle I8 so that the member I1 is no longer a slide, but may be regarded as the frame member. The hole IS in the middle of the blade 20 must be large enough to let the blade slip over the handle in the manner indicated in the dotted lines in Figure 8. The blade is then assembled on the slide in the same manner as in the first form of the invention.

The member 2| may be identical in construction with the guard member 3 excepting that the handle 2 is omitted and in this form of the invention, it functions as a slide. It has a slot 5 extending about half way therethrough and an inclined plane 6 bordering the edges of said slot. On its lower side, that is to say, the side which contacts the blade it has a groove I4 with slanting bottom I5. The blade having been placed upon the frame member H, the slide member 2| is pushed laterally upon the frame member H, the ribs I3 and I2 entering the slot 5, the shank I passing into said slot and the lower face 22 0f the handle I8 riding upon the inclined plane 6 and forcing the slide member 2| down upon the blade. The rib I3 engages the inclined bottom I of the groove I4, tending to press the anterior end of the slide member 2| down against the frame member I1 and thus counteracting any pressure bias created by the inclined plane Ii.

It will be observed in Figure 1 that the slide is provided with a knurled stripe 23 extending longitudinally along its exposed surface so that one grasping the handle 2 can by pressing his thumb against the knurled stripe unseat the slide from its clamped position and eject it from the razor together with the blade. This amounts to a complete disassemblage of the parts, permitting the razor to be washed and the blade discarded or replaced.

In that form of the invention shown in Figs. 6 to 9, inclusive, the slide member 2| which carries the guard teeth 4 may be unseated by grasping the guide teeth and sliding it contra to the direction in which it was inserted. The blade remains upon the frame member I! and may be removed by lifting it over the handle I8.

While I have in the above description disclosed what I believe to be preferred and practical embodiments of my invention, it will be understood to those skilled in the art that the specific details of construction as shown and described aremerely by way of example and not to be construed as limiting the scope of the invention as claimed.

What I claim is:

. 1. Razor including a frame member having a blade engaging portion, and a slide member engageable with the blade and movable in a plane parallel to the face of the blade to a position substantially congruent with said blade engaging portion, one of said members being adapted to receive and allocate a blade, one of said members having the surface opposite that which engages the blade formed with an inclined plane sloping downwardly toward one end, and having a longitudinal slot in said inclined plane opening in said end and terminating at an intermediate point in said member, and having the blade engaging face formed with a longitudinal groove starting from the point of termination of said slot and having a bottom oppositely inclined to said inclined plane, the other member having a shank adapted to travel in said slot and having an enlargement on theend of said shank adapted to engage said inclined plane for progressively resolving a component of the sliding movement of said slide into clamping pressure, and having an element engaging the bottom of said groove to counteract the uneven biasing pressure on said blade created by the co-engagement of said enlargement and said inclined plane.

2. Razor including a frame member having a blade engaging portion, and a slide member engageable with the blade and movable in a plane parallel to the face of the blade to a position substantially congruent with said blade engaging portion, one of said members being adapted to receive a blade and having a rib adapted to pass through a slot in the blade for allocating it, one of said members having the opposite surface to that which engages the blade formed with an inclined plane sloping downwardly toward one end, and having a longitudinal slot in said inclined plane opening in said end and terminating at an intermediate point in said member, and having the blade engaging face formed with a longitudinal groove starting from the point of termination of said slot and having a bottom oppositely inclined to said inclined plane, the other member having a shank adapted to travel in said slot and having an enlargement on the end of said shank adapted to engage said inclined plane for progressively resolving a component of the sliding movement of said slide into clamping pressure, and having said rib engageable with the bottom of said groove to counteract the uneven biasing pressure on said blade created by the co-engagement of said enlargement and said inclined plane.

3. Razor comprising a frame of the hoe type having a blade receiving member, blade allocating means on said member, and a handle fixed to said member, said handle being of reduced cross section adjacent said member, thereby forming a shank with an overhanging shoulder, a slide member engageable with the blade and movable in a plane parallel to the face of the blade to a position substantially congruent with said blade receiving member, said slide member having the opposite surface to that which engages the blade formed with an inclined plane sloping downward toward one end, and having a longitudinal slot in said inclined plane opening in said end, said shank being adapted to enter said slot and said shoulder being adapted to ride upon said inclined plane for pressing said slide into clamping engagement with said blade.

4. Razor comprising a frame of the hoe type having a blade receiving member, a rib on said member for allocating the blade and a handle fixed to said member, said handle being of reduced cross section adjacent said member, thereby forming a shank with an overhanging shoulder, a slide member engageable with the blade and movable in a plane parallel to the face of the blade to a position substantially congruent with said blade receiving member, said slide having the opposite surface to that which engages the blade formed with an inclined plane sloping downward to one end and having a longtudinal slot in said inclined plane opening in said end and terminating at an intermediate point in said member, and having the blade engaging face formed with a longitudinal groove starting from tthe point of termination of said slot and having a bottom oppositely inclined to said inclined plane, said shank being adapted to enter said slot and said shoulder being adapted to ride upon said inclined plane for progressively bringing said slide into clamped relation to said blade receiving member, and the ribon said blade receiving member being adapted to engage the bottom of said groove to counteract the uneven biasing pressure on said blade created by the co-engagement of said shoulder and said inclined plane.

5. Razor comprising a frame having a handle at one end and a guard member at the other, a removable slide cooperable with said guard member for clamping a blade therebetween, said slide member being movable in a plane parallel to the face of the blade, to a position substantially congruent with said guard member, a rib on said slide adapted to allocate a blade received upon said slide; the opposite surface of said guard member to that engageable with the blade being formed with an inclined plane opening in the end of said member remote from the handle, and. terminating at an intermediate point in said member, said slide having afixed stud having a shank adapted to enter said slot, and a head adapted to ride upon said inclined plane for pressing the slide into clamping engagement with said blade.

6. Razor comprising a frame having a handle at one end and a guard member at the other, a removable slide cooperable with said guard member for clamping a blade therebetween, said slide member beingmovable in a plane parallel to the face of the blade, to a position substantially congruent with said guard member, a rib on said slide adapted to allocate a blade received upon said slide, the opposite surface of said guard member to that engageable with the blade being formed with an inclined plane opening in the end of said member remote from the handle and terminating at an intermediate point in said member, and having the blade engaging face formed with a longitudinal groove starting at the point of termination of said slot and having a bottom oppositely inclined to said inclined plane, a stud fixed to said slide having a shank adapted to enter said slot and having a head on the end of said shank adapted to engage said inclined plane for progressively pressing said slide into clamping relation to said blade, said rib being adapted to engage the bottom of said groove to counteract the uneven biasing pressure on said blade created by the (so-engagement of said head and said inclined plane.

'7. Razor as claimed in claim 5, the outer face of said slide being formed with a longitudinal scored stripe affording a friction grip useful in ejecting the slide and blade from said razor.

8. Razor including two relatively slidable members, one holding a flat blade and adapted with said blade to be slidably moved endwise into a position of substantial congruency with respect to said other member, one of said two members being formed with an open ended longitudinal slot having the outer bounding surface thereof formed as a longitudinally extending rigid inclined plane, and a shank fixed to the other of said two members passable into said slot from one end thereof, said shank having an overhanging shoulder engaging said inclined plane for wedgingly traversing said inclined plane to exert a progressively increasing clamping pressure upon said blade between said members.

JACOB M. MOSES.