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Razor with Square Blade

PatentUS1721113

InventionSafety Razor

FiledMonday, 21st July 1924

PublishedTuesday, 16th July 1929

InventorRobert E. Hamilton

LanguageEnglish

CPC Classification:   
B26B21/20
  • B26B21/20
    Safety razors with one or more blades arranged transversely to the handle involving blades with more than two cutting edges; involving disc blades
  • B
    Performing Operations; Transporting
  • B26
    Hand Cutting Tools; Cutting; Severing
  • B26B
    Hand-Held Cutting Tools Not Otherwise Provided For
  • B26B21/00
    Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
  • B26B21/08
    Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor involving changeable blades
  • B26B21/14
    Safety razors with one or more blades arranged transversely to the handle

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A PDF version of the original patent can be found here.

Patented July 16, 1929. 1,721,113
United States Patent Office.

Robert E. Hamilton, of Louisville, Kentucky. Safety Razor Application filed July 21, 1924.Serial No. 727,396.

The present invention relates to safety razors and has for its prime object to generally improve upon such devices by providing a simple and efficient construction which will afford a maximum number of shaves with a minimum amount of trouble, one which is reliable, inexpensive to manufacture, easy to manipulate, strong, durable, and well adapted to the purpose for which it is designed.

With the above and numerous other objects in view as will appear as the description progresses, the invention resides in certain novel features of construction, and in the combination and arrangement of parts as will be hereinafter more fully described and claimed.

Figure 1 is an end elevation of the razor embodying the features of my invention,

Figure 2 is another end elevation thereof showing the handle in section,

Figure 3 is a section taken through the razor substantially on the line 3—3 of Figure 1,

Figure 4 is a plan view of the guard plate, and

Figure 5 is a section therethrough taken substantially on the line 5—5 of Figure 4.

Referring to the drawing in detail it will be seen that 1 designates the body of the razor which is provided with the central square opening 2 and a marginal flange 4. This flange 4 has a square contour as is shown to advantage in Figures 1 and 2 being provided adjacent its edges with slots 5. At the corners there are provided blade guards 6. A guard plate 7 having a square formation is provided with a concave inner surface indicated at 8 on which is mounted a U-shaped spring clip 9 by means of a screw 10. This U-shaped spring clip 9 is provided with diverging terminals 11 and is adapted to be inserted through the square opening 2 so that its diverging terminals 11 overlap the outer face of the body 1. The upper face of the body 1 is of a substantially concaved formation and a square blade 12 is adapted to rest thereon being held in place by the guard plate 7. This blade is provided with four cutting edges and the corners thereof are prevented from contacting with the skin by guards 6. A bracket 14 is mounted on the outer face of the body 1 over the opening 2 and is provided with a threaded opening for receiving the reduced threaded extension 15 of a handle 16.

This razor is equal to four razors of the type with one cutting edge only and in using the same it will be seen that the lather, while shaving, may be passed through the slots 5 thus preventing the cutting edge of the blade from becoming inefficient as is the case where the lather and severed hairs clog between the cutting edge of the blade and the flange 4 or its equivalent in other razors. The device is very easily assembled as it is only necessary to place the blade which is provided with a central opening over the body 1 and by pressing the legs of the spring clip toward each other they may be inserted into the opening 2 and the guard plate 7 pushed down on the body until the terminals of the clip engage the outer face of the body thus holding the guard plate so that the blade is firmly held on the body. It will be evident that in order to separate the guard plate from the head 1 and permit of the removal of the razor blade, it is only necessary to engage the projecting lower ends 11 of the fingers 9 and spring these ends inwardly, at the same time moving the fingers and consequently the head 7, so that the fingers will be advanced in the opening 2 a distance sufficient to permit of the fingernails of the user being engaged beneath the opposite margins of the guard plate 7 to complete the withdrawal of the fingers from the said opening.

Although I have described the invention with a certain degree of particularity, it is evident that changes in the details of construction and in the combination and arrangement of parts may be resorted to without departing from the spirit or scope of the invention as hereinafter claimed or sacrificing any of its advantages.

Having thus described my invention, what I claim as new is:

1. A safety razor including a head having an opening extending between its upper and under sides, a guard plate disposable against the upper side of the head for clamping a razor blade in place upon the head and means for separably connecting the plate with the head comprising spaced resilient fingers extending from the under side of the guard plate and insertible into the said opening to bear frictionally against opposite walls thereof, the said fingers having their lower ends deflected outwardly on curved lines to engage against the under side of the head at the lower edges of the walls engaged by the fingers, the said ends of the fingers being exposed whereby the same may be pressed toward each other to permit withdrawal of the fingers from the opening.

2. A safety razor including a head having an opening extending therethrough between its upper and under sides, a handle disposed in axial alinement with the head, means connecting the handle to the under side of the head with the end of the handle spaced from the said under side of the head, a guard plate disposable against the upper side of the head, and means for removably securing the guard plate upon the head comprising spaced resilient fingers extending from the under side of the guard plate and insertible in the said opening to bear frictionally against the opposite walls thereof, the lower ends of the fingers being deflected outwardly to project into the space provided by the attaching means for the handle, and to bear against the under side of the head at the lower sides of the walls of the opening which are engaged by the said fingers, the said ends of the fingers being exposed whereby the same may be pressed toward each other to permit withdrawal of the fingers from the opening.

3. A safety razor including a head having an opening therein extending between its upper and under sides, a member comprising a body portion having a threaded opening and arms radiating from the body portion and extending upwardly above the plane thereof and having their ends secured to the under side of the head, a handle having a threaded shank fitted into said opening, a guard plate disposable against the upper side of the head for clamping a razor blade in place upon the head, and means for separably connecting the guard plate with the head comprising resilient fingers extending from the under side of the guard plate in spaced relation to each other and insertible into said opening to bear frictionally against opposite walls thereof, the said fingers having their lower ends deflected outwardly on curved lines to project below the lower end of the opening and between the fingers upon the handle mounting member.

In testimony whereof I affix my signature.

Robert E. Hamilton.