US2154211A - Blade cutter - Google Patents

Description

April 11, 1939. J w MADSEN 2,154,211

BLADE CUTTER Filed Feb. 5, 1937 Patented Apr. 11, 1939 UNITED STATES PATENT OFFICE BLADE CUTTER 2 Claims.

My invention relates to a device for holding and securely retaining razor blades or other blades for cutting operations.

An object of my invention is to provide such the blade.

A further object of my invention is to provide means for automatically locking the blade in operative position when the device is open for use.

A further object of my invention is to provide means for causing positive retention of the blade along the greater part of its area so that it will not become dislodged or loosened during the cutting operation.

A further object of my invention is to provide a blade holding unit which collapses to a minimum size, and which can be manufactured at a very reasonable cost.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my device, whereby the objects contemplated are attained, as hereinafter more fully set forth, 25 pointed out in my claims, and illustrated in the accompanying drawing, in which:

Figure 1 is a side elevation of the cutter in its open position,

Figure 2 is a plan view of the same,

Figure 3 is a sectional view taken medially along the longitudinal center of the device,

Figure 4 shows the device in its collapsed position,

Figure 5 is an enlarged detail of the pivoting and locking means, and

Figure 6 is a further enlarged detail of an elevation of Figure 5.

I have used the character It to designate generally the blade receiving member which in- 40 eludes the side walls I I which are suitably spaced to receive the razor blade I2, and which side walls converge into the indentations I3 at the end thereof to form the end of the device.

The lower ribs I4 provide means for convenient grasping with the finger nails to open the device. The side walls H include the cut away portions l5 having the sloping edges I6, all of the edges of which are bevelled as at H. The shoulder I8 (see Figure 3) is so positioned to overlie one lower edge of the blade as shown, this edge being represented by the character I9.

The casing includes the side Walls 2I, and this casing is pivoted to the blade receiving member Ill through the medium of a hollow rivet 22 passing therethrough as shown. The casing 20 a holder which will allow convenient insertion of includes the integrally formed edge which terminates in the arcuate extension 24, which extension terminates at 25.

When the holder is collapsed together as shown in Figure 4, the shoulder I8 will strike the point 25, preventing further closing so that the edge 26 of the blade will not strike any metal portions. The tensioning and locking arrangement is shown more clearly in Figure 5.

The side walls II of the blade receiving member extend into the raised portions 21. The space 28 is made fairly large in order to secure a maximum tensioning effect. The portions 21 again merge into the parallel extensions 29, which extensions are indented very slightly from the level of the portions 21. This indentation is very small in comparison with the space 28 for reasons to be explained. Similarly the side walls 2| in the casing 20 include the slightly depressed indentations 36 which merge with the further parallel extensions 3 I Looking at the elevation as shown in Figure 6, the indentations 3B in the outer casing walls 2I include the arcuate lower portions 32, and similarly the portions 21, which are formed with the side walls II, include the arcuate lower portions 33.

The method of operation of the device will now be explained. Before inserting the blade, the outer casing 26 and the blade holding member I II are placed approximately at 45 degrees as shown in Figure 6, the blade is then inserted freely between the side walls II and is then pushed over against the end I3 (see Figure 3) so that the portion I9 underlies the shoulder I8. Next the casing 20 is opened to its extended position as shown in Figures 1, 2, and 3. During the extending operation, by virtue of the pivoting action on the rivet 22, the portions 30 will first come in contact against the raised portions 21 as shown clearly in Figure 6. As the portions 30 slide over the portions 21, compression will occur against the sides I I, thereby efficiently compressing the blade I2 along practically the entire area of the side walls II. As soon as the device is completely opened, the various projections and the like will take the position as shown in Figure 5. The portions 30 will then snap into the very slightly indented extension at 29. The reason for this is to insure that the device is retained in its opened position during the cutting operation.

It will be noted, however, that the indentation at 29 is so slight that it merely holds the members open, and yet allows a maximum amount of compression against the side walls H to retain the blade properly. This feature will be present since the spacing at 28 is considerably greater, being practically five times as great as the indentation at 29.

It is a simple matter to reverse this process allowing loosening of the blade so the same can be removed for replacement, etc.

The side walls II of the blade receiving member can be bowed inwardly in the shape of concave arcs to insure maximum tension against the center of the blade if so desired.

When folded together, the device appears as in Figure 4,,which provides a convenient guard and reduces the size of the device to a minimum.

The slight shoulders at 343 and 35 are provided to insure a maximum limited opening of the device. It will now be seen that I have provided a blade holder or cutter which allows convenient insertion of a blade, which automatically locks the blade in operative position when the holder is open for use, which causes positive retention of the blade along a maximum compression area, which collapses to a minimum size, and which can be manufactured at a very reasonable cost.

Some changes may be made in the construction and arrangement of the parts of my invention without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims any modified forms of structure or use of mechanical equivalents, which may be reasonably included within their scope.

I claim as my invention:

1. A blade cutting device comprising an enclosed blade receiving member including spaced side walls and having an upper opening, an end shoulder for retaining a projecting edge of the blade, an outer casing pivoted to said blade receiving member, means for compressing said blade receiving member side walls against the blade during opening movement of the casing including oppositely indented portions in said side walls, said outer casing walls arranged to coact therewith during said opening movement, the direction of movement of said casing walls being in the same plane as the blade and the blade receiving member, said receiving member side walls having major outwardly indented portions, said casing having minor inwardly indented portions against which said major portions compress during movement of the casing, said major indentations in said side walls merging with the minor indentations to receive the same therein when the casing is fully opened to provide retention means.

2. A blade cutting device comprising an enclosed blade receiving member including spaced side walls and having an upper opening, an end shoulder for retaining a projecting edge of the blade, an outer casing pivoted to said blade receiving member, means for compressing said blade receiving member side walls against the blade during opening movement'of the casing including oppositely indented portions in said side walls, said outer casing walls arranged to coact therewith during said opening movement, the direction of movement of said casing walls being in the same plane as the blade and the blade receiving member, said receiving member side walls having major outwardly indented portions, said casing having minor inwardly indented portions against which said major portions compress during movement of the casing, said major indentations in said side walls merging with the minor indentations to receive the same therein when the casing is fully opened to provide retention means, said casing including an inwardly bent lip at the end thereof to provide limiting movement of the casing with respect to the blade receiving member to prevent injury to a blade edge.

JENS A. W. MADSEN.

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