This invention relates to injector razors and has for its object to improve and simplify the construction of such razors. The injector razor in common use today comprises a back plate terminating in a forwardly extending blade-clamping cap, and a blade platform and guard on a cam plate depending from the rear edge of the platform, articulated to the back plate and held with the blade platform in contact with the cap and back plate by means of a spring, the whole being mounted on a handle. Blades are fed to such a razor from an injector magazine which is provided with a forwardly extending cam finger designed to be inserted between the cam plate and the back plate and, by separating the two, to release the clamping pressure upon the blade on the platform, whereupon the topmost blade of a stack of sharp blades in the magazine is fed forward between the cap and the platform, discharging the dull blade as the sharp one moves into shaving position.

In the common injector razor the cam plate is articulated to the back plate by means of a tongue struck up from the latter and extending forward through an opening in the cam plate. Two additional tongues are bent forward from the back plate to form stops or supports for the lower edge of the cam plate. The S spring which presses the cam plate backward and upward so that the blade platform is held against the cap and back plate, is riveted to the back plate near its lower end. The upper end of the spring is bifurcated to engage a tongue struck from the blade platform and extending downward. The back plate extends downward below the rivet and into a ferrule to which it is permanently attached, and the ferrule is fixed upon the upper end of the handle.

In accordance with the present invention I eliminate the three tongues which support the lower edge of the cam plate and articulate it to the back plate, and hold the blade platform and its depending cam plate in position by means of the spring alone. This spring is shaped like a question mark. Its curved, upper end is provided with a tongue which enters a slot at the intersection of the blade platform and the cam plate, and its straight, lower, depending end is provided with a shoulder pressed out just below the curve to allow for play of the cam plate while holding it in place. The back plate is provided with a lower depending end of the same size and shape as that of the spring and the two are held together in juxtaposition during assembly by a button pressed up from the depending end of the back plate and fitted within a corresponding hole in the depending end of the spring.

After the cap, blade platform, and spring, constituting the head of the razor, have been assembled as just described, they are mounted within a slot in the upper end of the handle, the juxtaposed lower ends of the back plate and spring making frictional engagement with the sides of the slot. The upper, slotted end of the handle is encased within a metal ferrule the outer end of which is suitably slotted to receive the head of the razor.

In the accompanying drawings I have illustrated a preferred embodiment of my invention. In these drawings

Figure 1 is a front elevation of an injector razor embodying my invention;

Figure 2 is an end view of the razor shown in Figure 1;

Figure 3 is a rear view of the same razor;

Figure 4 is a longitudinal, vertical section on an enlarged scale taken along line 4—4 of Figure 1 and showing the relation of the parts when a blade is mounted on the head in shaving position;

Figure 5 is a longitudinal, vertical section through the head, as shown in Figure 4, but with the cam finger of an injector magazine inserted between the back plate and the cam plate of the blade platform;

Figure 6 is a horizontal section, also on an enlarged scale, taken along line 6—6 of Figure 1; and

Figure 7 is a perspective view, on an enlarged scale, of the spring.

The injector razor illustrated in these drawings comprises a handle 1 on which is mounted a razor head 2. This head comprises a back plate 3, bent forward at its upper end to form a blade-clamping cap 4, a blade-supporting platform 5 having a cam plate 6 depending from its rear edge and a guard 7 at its forward edge, provided with blade stops 10, one at either end and a spring 8 which holds the cap and platform and their depending plates in position with the blade 27 clamped between the blade stop 10 and the back plate 3, and overlaid by the cap 4. This spring, which is roughly in the shape of a question mark, is provided at its upper curved end with a tongue 9 which extends within a slot 11 at the intersection of the platform 5 and the plate 6 and at the middle of the razor head. The back plate 3 is provided with a narrow depending extension 12 and the spring 8 with a like depending extension 13 of the same size and shape. A button 14 pressed up from the forward face of the extension 12 fits within a hole 15 in the extension 13 and holds the spring in proper relation to the other parts of the head during assembly. The cam plate 6 lies between the spring and the back plate 3. In order that this plate shall have room and be free to swing during the blade-injecting and ejecting operation, the spring is bent forward to form a shoulder 16, and to strengthen the spring and prevent breakage along the line of the shoulder, a rib 17 is struck up from the extension 13, as shown best in Figure 7.

The upper end of the handle 1 is provided with a slot 18 shaped to snugl yhold the juxtaposed extensions 12 and 13. The slot is also cut away at 19 in order that it may receive the rib 17. Encasing the upper end of the handle 1 is a metal ferrule 21 having a transverse slot 22 extending from side to side and capable of receiving the lower edge of the back plate 3. This slot is widened for part of its length at the middle of the ferrule to receive the extension 13 and is also cut away at 23 to receive the rib 17. The lower edge of the cam plate is cut away at 24 to span the spring and at 25 to span the ferrule.

The razor just described is assembled as follows: The blade platform 5, with its cam plate 6, are placed within the angle formed by the cap 4 and the back plate 3. The tongue 9 of the spring 8 is then inserted within the slot 11 and the extension 13 pressed down over the extension 12, the button 14 entering the hole 15. The parts of the head are now temporarily assembled. The ferrule 21 having been mounted on the handle 1, the juxtaposed extensions 12 and 13 are inserted through the slot 22 and into the slot 18 and the head pressed down until the bottom edge of the back plate 3 has reached the bottom of the slot 22, as shown in Figure 2. The parts are so designed that the head is now frictionally mounted on the handle and cannot be accidentally removed without the exertion of a stronger pull than an ordinary shaver is likely to apply so that no permanent securing means are necessary.

The injector razor just described operates in general like any injector razor. When it is desired to remove a dull blade and insert a sharp one the cam finger 26 of an injector magazine is inserted within the space between the back plate 3 and the cam plate 6, swinging the plate 5 forward against the pressure of the spring 8, as shown in Figure 5. This movement, by separating the stops 10 from the back plate 3, releases the pressure exerted on the blade 27. With the parts in the position as shown in Figure 5, it is now possible to inject a sharp new blade and simultaneously eject an old one.

It will be noted that the blade platform 5 and its cam plate 6 are held in the razor by means of the spring 8 only. During the blade injecting-ejecting operation the plate 6 is swung forward about its lower edge. There is no articulating tongue to hinge the plate 6 on the back plate 3, and there is no rivet mounting the spring 8 on the back plate. The razor of my invention is thus simpler to make and assemble.

I claim:

1. An injector razor comprising a blade platform, a cam plate depending from the platform, a blade-clamping cap overlying the platform, a back plate depending from the cap, a spring pressing backwardly and upwardly at the intersection of the blade platform and its cam plate, a tongue on the upper end of the spring, an aperture at the intersection of the blade platform and the cam plate into which the tongue extends, a depending extension on the spring, an outwardly projecting shoulder on the extension below the lower edge of the cam plate, a depending extension on the back plate in juxtaposition with that on the spring, and a handle having a slot within which the depending juxtaposed extensions on the spring and back plate are frictionally held.

2. An injector razor comprising a blade platform, a cam plate depending from the rear edge of the platform, a blade-clamping cap overlying the platform, a back plate depending from the the rear edge of the cap, a spring shaped like a question mark pressing backwardly and upwardly at its curved end at the intersection of the blade platform and its cam plate, a tongue on the upper end of the spring, an aperture at the intersection of the blade platform and the cam plate into which the tongue extends, a depending extension on the spring, an outwardly extending shoulder on the extension below the lower edge of the cam plate, a reenforcing rib extending downwardly from the shoulder, a depending extension on the back plate in juxtaposition with that on the spring, a button on the forward face of the extension on the back plate, a hole in the extension on the spring into which the button extends, and a handle having a slot within which the depending juxtaposed extensions of the spring and back plate are frictionally held.

Charles E. Butlin.

References Cited in the file of this patent

UNITED STATES PATENTS