PATENT SPECIFICATION

Application Date : June 2, 1932. No, 15591/32. Complete Left: Feb. 7, 1933. Complete Accepted : Nov. 30, 1933.

---

PROVISIONAL SPECIFICATION. Improvements in or relating to Safety Razor Frames

402,154

I, Jesse Booth, a British Subject, of 927a, Abbeydale Road, in the City of Sheffield, do hereby declare the nature of this invention to be as follows:—

This invention relates to safety razor frames for use with wafer blades, the objects of the invention being to provide means to facilitate the manipulation of the frame or holder when assembling and disassembling the component parts and also to simplify the construction thereof.

Hitherto, in safety razor frames, it has been usual to follow one of two constructions, each consisting of three detachable component parts. One of these constructions comprises a handle, a comb or guard and a clamp plate, the blade being clamped between the comb and the clamp plate by means of a screw connection between the handle and the clamp plate. In the other construction the handle is tubular or hollow throughout and is rigidly secured to the underside of the comb or guard, the screw connection of the clamp plate, to effect clamping of the blade, being extended through the handle and being secured by a loose barrel nut lying within the hollow handle.

Both these constructions have the disadvantage that there are three component parts, an additional disadvantage being that the handle assembly is heavy and costlv to manufacture.

According to the present invention, a safety razor frame or holder is characterised in that it comprises only two detachable parts, the comb or guard being rotatably secured to the handle and being internally screw-threaded for a short distance to receive the screw of the clamping plate. In the case where the comb or guard is inclined relatively to the handle, the clamping screw is pivoted either to the handle or to the clamping plate so as to enable the clamping* plate to be reversed.

In one form of carrying out this invention, the guard plate is provided at or about its centre with a hole through which one end of the tubular handle is adapted to pass and to be riveted, spun or otherwise secured to the guard in such a manner that whilst the handle and guard are permanently secured together, they are capable of rotation relatively to one another. A ferrule, abutment or the like is provided on the handle to prevent undue play of the guard, which may be provided with a boss on its underside for the like purpose. The guard-end of the handle is screw-threaded internally to receive the usual medially disposed screw of the clamping plate, and the usual positioning pegs and holes are provided on the clamping plate and guard respectively.

In the case of such frames where the guard plate is inclined relatively to the handle, the screw of the clamping plate is pivoted, so that the clamping plate may be reversed.

In use the wafer blade is placed over the central screw and the pegs of the clamping plate and the handle screwed on, the arrangement of the handle and its attached guard being such that when the pegs on the clamping plate register with the holes in the guard, the handle may be rotated to screw the parts firmly together.

I, Jesse Booth, a British Subject, of 937A, Abbeydale Road, in the City of Sheffield, do hereby declare the nature of this invention and in what manner the same is to performed, to be particularly described and ascertained in and by the following statement:—

This invention relates to safety razor frames for use with wafer blades, more particularly of the flexible type having two cutting edges and generally to those safety razor frames in which the handle or any part thereof is utilised to act as a screw, nut, or cam, with the object of clamping the blade either flexed or straight into or between other essential components of the razor frame.

One object of the invention is to provide a simple means whereby the member which constitutes the topmost blade clamp, hereinafter known as the clamping plate, can be assembled interchangeably, end for end on such razor frames as have the blade and guard fixed at an angle of inclination with the handle, i.e., angular head razor frames.

Another object is to enable such a clamping plate to interchange on razor frames of the orthodox type in which the assembled head is square with the handle.

A further object is to provide means of easy manufacture, to facilitate manipulation when assembling and disassembling the component parts of the complete frame, and the razor blade, and to ensure that the component parts automatically and correctly adjust their position during assembly for rise.

The invention is particularly applicable to angular head razor frames of the type described in Specification No. 298,877, where the clamping plate occupies a different angular position relative to its securing member when turned end for end and where the screw, nut or cam is required to swing in one plane only, relative to the perpendicular axis of the clamping plate.

To effect this, according to the invention a transverse hinge-pin is provided between the clamping portion of the clamping plate and the clamping screw, nut or cam, member attached thereto so positioned that its axis is caused to be placed substantially at the inter-section of the perpendicular axis of the clamping plate and the axis of the handle or other mating screw portion when the razor is assembled.

To ensure that the screwed member or cam so pivotted, is always in a position to be assembled with the other component parts of the razor frame, limiting surfaces are provided to limit the angular movement to an amount not substantially greater than that required.

I am aware that in a prior proposal for a razor having a head of adjustable angularity, the clamping screw was provided with a spherical head fitting a depression in the clamping plate, a reduced part of the screw being placed in a slot in the depression to allow the screw to take up any position within the limits of the slot on either side of the perpendicular to the clamping plate.

One form of the invention will now be described with reference to the drawings—

a Figs. 1 and 3 represents a clamping plate of orthodox design except for the features described in this specification.

b Fig. 2 represents a guard or head inclined at an angle in one plane with the handle c, in which handle is incorporated the nut member f as shown.

e Figs. 1 and 3 represent a slotted member rigidly secured to or integral, with a, and which forms one component of a knuckle joint with a transverse hinge-pin p as its pivotal centre, coinciding with the intersection of the axis x.x. of the clamping plate, with the axis y y of the screwed member.

It will be seen in Fig. 1, that the screwed member d is shown in the full angular position, that is when one side of the inner extremity of the screwed member d which comprises the other major component of the knuckle joint is in contact with the bottom of the slot in e at k thus allowing no further movement of the clamping plate to take place in an anti-clockwise direction around the pivot p.

The invention is not limited precisely to the arrangement shown and it will be observed that the female screwed member may be made a component part of the clamping plate, and the male screwed member a component part of the handle.

Having now particularly described and ascertained the nature of my said invention, and in what manner the same is to be performed, I declare that what I claim is:—

(1st). A razor frame clamping plate in which the screw, nut or cam, is pivotted on a transverse hinge-pin, to the clamping plate to enable the clamping plate to be assembled interchangeably end for end on angular head razor frames, by allowing it to swing in a plane, through an angle, on each side of the perpendicular axis.

(2nd). A razor frame clamping plate as characterised in Claim 1, where the angular movement of the screw, nut or cam, relatively to the clamping portion is limited by the provision of fixed stop surfaces on the said clamping portion.

(3rd). A razor frame clamping plate as characterised in Claims 1 or 2, which will interchange with orthodox frames in which the head or guard is square with the handle.

(4th). A safety razor frame, clamping plate substantially as herein described and illustrated by the accompanying drawings.

Dated this 14th day of June, Nineteen hundred and thirty three.

Jesse Booth.