This invention relates to safety razors, the invention having for an object the provision of a novel and efficient type of safety razor arranged to facilitate shaving.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawing, and to the appended claims in which the various novel features of the invention are more particularly set forth.

Fig. 1 of the drawing is a perspective view of my improved safety razor.

Fig. 2 is a central longitudinal sectional view thereof.

Fig. 3 is a transverse sectional view taken on the line 3—3 of Fig. 2.

Fig. 4 is a fragmentary perspective view of the handle.

Fig. 5 is a fragmentary sectional view taken on the line 5—5 of Fig. 2.

As here embodied my improved safety razor comprises a guard plate 10 of square form and with teeth 11 on all four sides thereof, this guard plate being arched from the edges to the centre. Upon this plate the blade 12 is removably attached, this blade being in the form of a thin sheet steel member of square form and sharpened on all four sides, the blade being slightly smaller than the guard plate to leave the teeth 11 on the latter projecting beyond the edges of the blade.

The blade 12 is secured upon the guard plate 10 by means of a clamping plate 14 which is arched or concaved similarly to the guard plate on its rear face, its front face being of a relatively greater convexity, the clamping plate tapering in thickness toward the edges thereof so as not to present any shoulder at the edge. Carried by the clamping plate 14 is a screw 16 which projects through suitable central apertures in the blade 12 and guard plate 10 and is adapted to engage in a threaded socket 17 in the forward end of a handle 18. The threads on the screw 16 and in the main length of the socket 17 are each of quadrantal form leaving quadrantal unthreaded spaces 16′ and 17′ between the thread sections. At the rear end of the socket the threads extend completely around the latter. When screwing the handle in place the front end thereof can be inserted over the screw until the rear end of the latter contacts with the complete threads at the rear end of the socket and the parts are then tightened by a few turns of the handle, the threads on the screw and in the socket being preferably so arranged that when the handle is tightened the quadrantal threads throughout the length of screw and socket will be engaged with one another.

Since some users of safety razors prefer to use the same with the handle not fully tightened I have arranged the screw 16 so that it may be given a rotary adjustment when desired. To this end the screw is formed with a disk head 22 which engages in a recess 23 in the clamping plate 14 and is formed on its underside with a number of lugs 24 which engage in forwardly projected offsets 25 from the said recess and which radiate from the central opening in the clamping plate through which the neck of the screw passes, an expansion spring 26 being located in the recesses and bearing on the screw head 22 to hold the latter in position with the said lugs engaging in the said offsets. By pushing forwardly on the screw 16 and then giving it a slight turn, the screw can be given a rotary adjustment so that when the handle 18 is tightened to the desired degree the threads in the socket 17 and on the screw 16 will be in engagement throughout their entire length. The end of the handle 18 that abuts against the guard plate is convexed as indicated in Fig. 2 in correspondence with the curvature of the guard plate. It will be apparent that by reason of the four sided and arched construction of the guard plate that the handle, when rotated in contact with the guard plate will receive a slight back and forth longitudinal movement. By varying the angular positioning of the screw 16 the threads on the handle may be made to engage the threads on the screw during either the backward or forward movement of the handle, and it will be obvious that the extent to which the screw 16 will be drawn backward during the rotary movement of the handle will be correspondingly varied.

The blade guard plate and clamping plate are held against turning movement with respect to one another by means of studs 30 on the clamping plate which project through suitable registering apertures in the blade and the guard plate. The blade may be constructed in any suitable manner to make it resilient or my improved locking means may be applied to a two-edged blade. While I have illustrated and described a preferred embodiment of my invention it is to be understood that I do not limit myself to the precise construction herein disclosed, and that various changes and modifications might be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Having thus described my invention what I claim as new and desire to protect by Letters Patent of the United States is as follows:

1. A safety razor comprising a guard plate, a blade, a clamping plate, said guard plate, blade and clamping plate being each of square outline and transversely arched formation, a screw carried by the clamping plate and having quadrantal threads thereon, a handle having a socket formed throughout its main length with quadrantal threads and at its rear end with annular threads, said handle being adapted to engage over the said screw and abut at one end against said guard plate, said end of the handle being convexed in correspondence to the transverse curvature of the guard plate, a head on said screw engaging in a recess in the said clamping plate, and co-operating elements on said head and clamping plate whereby the said screw may be retained in angularly adjusted positions.

2. A safety razor comprising a guard plate, a blade, a clamping plate, said guard plate, blade and clamping plate being each of square outline and transversely arched formation, a screw carried by the clamping plate and having quadrantal threads thereon, a handle having a socket formed throughout its main length with quadrantal threads and at its rear end with annular threads, said handle being adapted to be engaged over the said screw and abut at one end against said guard plate, said end of the handle being convexed in correspondence to the transverse curvature of the guard plate, said screw being provided with means for effecting non-rotative attachment thereof to said clamping plate in angularly adjusted positions.

3. A safety razor comprising a guard plate, a blade, a clamping plate, said guard plate, blade and clamping plate being each of square outline and transversely arched formation, a screw carried by the clamping plate and having quadrantal threads thereon, a handle having a socket formed throughout its main length with quadrantal threads and at its rear end with annular threads, said handle being adapted to be engaged over the said screw and abut at one end against said guard plate, said end of the handle being convexed in correspondence to the transverse curvature of the guard plate, a head on said screw engaging in a recess in the clamping plate and having circularly spaced projections adapted to engage in similarly spaced offsets from said recess to hold said screw against angular movement, and a spring located in said recess and holding said projections engaged in the said offsets.

In testimony whereof I have affixed my signature.

Ralph Severino.