USRE22708E - Safety razor - Google Patents

Description

Jan. l5, 1946. l J. MUROS Re. 22,708

SAFETY RAZOR l Original Filed Oct. 16, 193.5 2 Sheets-Sheet l lll,

J. MUROS SAFETY RAZOR Jan. 15, 1946.

Original Filed Oct. 16, 1955 2 Sheetsl-Sheet 2 @vill/lll! z ozm w wu 7. If?. z

Ressuecl Jan. 15, 1946 SAFETY RAZOR.

Joseph Muros, Cambridge, Mass., assignor to Gillette Safety Razor Company, Boston, Mass., a corporation of Delaware Original No. 2,060,520, dated November 10, 1936, Serial No. 45,299, October 16, 1935. Application for reissue October 10, 1945, Serial No. 621,585

G Claims.

This invention relates to safety razors of the type employing a sectional cap in combinationl with an actuating member connected to the cap sections and movable to swing them simultaneously toward or from blade-clamping position. An example of such a razor is to be found in own prior Patent No. 1,992,038.

The object of the present invention is to simplify the mechanism for swinging the cap sections and for rapidly moving the blade supporting member in the razor to flex and clamp the blade. As herein shown, the cap sections are pivotally mounted by supporting arms in the razor head and are connected to a common actuating member which in this case comprises a blade supporting plate having connections for swinging the cap sections simultaneously. A compact and effective connection is produced, as herein shown, by providing the cap sections and the blade supporting plate with parallel adjacent arms and providing an angular cam slot in one set of arms and a cam pin in the cooperating set of arms. The cam Slot may be designed to impart a rapid closing movement to the cap sections during the initial movement of the actua*- ing plate and then to hold the cap sections in closed position during the iinal blade-clamping movement of the plate. Each cap section is further shown as equipped with a guard member which is movable in an arcuate path away from the blade when the cap section is swung into open position, thus leaving the blade in a particularly open and easily-accessible positionior removal or replacement.

Another feature of the invention resides in novel mechanism for imparting rapid and light movement to the cap sections. As herein shown, this mechanism. comprises a double-threaded member arranged to be rotated by the user for imparting a high Speed movement to the actuating plate. This construction offers a compact reliable mechanism capable of convenient manipulation and of light weight and is, therefore, highly desirable in the construction of an improved safety razor.

These and other features of the invention will be :best understood and appreciated from the following description of a preferred embodiment thereof, selected `for purposes of illustration and shown in the accompanying drawings, in which:

Fig. 1 is a view in perspective on an enlarged scale of the razor in closed position;

Fig. 2 is a view of the razor in vertical crosssection;

Fig. 3 is a viewof the razor head in crosssection at right angles to that shown in Fig. 2;

Fig. 4 is a view of the razor in vertical crosssection showing the cap sections closed and the blade supporting plate in mid position;

Fig. 5 is a similar view showing the cap sections in open position; and

Fig. 6 is a plan View of the razor head.

In the preferred embodiment of the present invention the frame of the razor includes an elongated plate I0 having end anges II turned up at right angles to the body of the plate. The cap sections I2, each provided with downwardly extending arms I3, are pivotally mounted by pivot pins I4 between the opposite ends of the end flanges II of the razor head. Each of the cap sections, in addition to its blade engaging portion, is provided with a bar guard I5 outwardly convex in shape and located slightly beneath and in advance of the cutting edge of the blade. The bar guard I5 is separated from the body of the cap section by an elongated opening through which the edge of the blade projects when clamped in shaving position. Each cap section arm' I3 also carries a short inwardly extending cam pin I6 whose function will be presently explained.

In the razor illustrated, the functions of the blade carrier and the actuating device for the cap sections are combined in an elongated plate I1 which, in the open position of therazor, lies between the end flanges I I and is provided at each corner with a downwardly extending arm provided with an angle cam slot I8. The arms of the .blade carrier plate I 1 lie inside the corresponding arms I3 of the cap sections and in sliding contact therewith and one of the cam pins I5 on each cap section arm projects into the cam slot and is controlled in its position by the movement of the cam slot with the blade carrier plate I1. The carrier plate is also provided in its upper vface with a pair of upwardly projecting studs I9 herein shown as being of diamond-shaped contour and adapted to nt in correspondingly shaped blade apertures to locate a blade accurately in position upon the blade carrier I1. The plate itself is rigidly mounted upon the upper end of a stem 20 which projects downwardly into the handle of the razor and is threaded at its lower end. A blade 2I is shown in position upon the blade carrier in Figs. l to 4 and it will be understood that the blade is perforated to it upon the studs I9 and provided with corner recesses dening elongated unsharpened portions at each end of the blade which project slightly beyond the Ends 0f the cap sections I2.

The razor head includes a. neck 22, circular in cross-section and rigidly secured to the elongated plate Ill of the frame. The neck is provided at its lower end with a centrally disposed bore 23 internally threaded at its lower end. The neck 22 is externally/,shouldered to receive :the barrel `25 of the handle, and within the barrel is disposed an elongated nut 24, reduced in diameter at its upper end and threaded into the bore of the neck 22. The nut is also provided with a centrallydisposed bore which is threaded to receive the lower end of the blade-carrier stem 20. As herein shown, the outside thread of the nut 24 is a right-hand thread, and the thread of the stem 20 is a left-hand thread. Theresult is that, when the user turns the nut 24 toward the right, the stem 20 will be elevated in a .rapid movement equalling the sum of the pitch of the two threads for each revolution of the nut 24. When the'nut is turned in a left-hand direction, the stem 20 will belowered ,at a correspondingly rapid rate.

Assuming now that the razor is clamped in `shaving position as shown in Fig. 2 and that the user desires to open the razor for purposes of replacing or `cleaning the blade, vin l turning the .nut 24 to the left he first lowers the blade carrier IT from the position shown in Fig. 2 tothe position shown in Fig. 4, releasing the blade from the pressure of the cap sections l2 and permitting it to assume a dat position. In this movement the vertical portions of the cam slot I8 travels downwardly with respect to the cam pins I6 and vno swinging movement is imparted to the cap sections I2. However, as the downward movement of the plate I1 is continued the horizontal portion of the cam slots I8 comes into play and the pins IG are forced to move inwardly beneath the lpivotal axis of the cap section which are, therefore, swung rapidly outwardly kinto their wide open position, as shown in Fig. 5. In this position, the face of the blade carrier .I1 is fully exposed and the blade may be `conveniently removed or replaced. When it is again desired to close vthe razor and clamp the .blade in shaving position the nut 24 is turned in a right-hand direction whereupon the cams of the carrier plate act first to swing the cap sections into closed position, as shown in Fig. 4 and then to hold them in this position while the carrier plate lcompletes its upward movement clamping the blade against the inner concave surface of the cap sections I2,

, thereon, a movable blade-supporting plate and an angle slot and pin connection between said plate and the cap sections, whereby, in the upward movement of the plate the cap sections are rst .closed and then locked in closed position by said connection.

2. `A safety razorhaving, in combination, a stationary support, cap sections pivotally mounted `thereon through the medium of downwardly extending arms, and a vertically movable bladesupporting lplate having arms with right angle cam slots therein disposed adjacent to the arms of the cap sections, and cam pins projecting from the arms of the cap sections into said slots and movable therein Yrst to swing and then tolock the sections.

3. A safety razor having, in combination, asupport with stationary cross arms, cap sections rwith downwardly extending arms at `each end which are pivotally connected to said cross arms, and a :blade-supporting plate vertically movable between said cross arms and having angular cam slots therein which are so connected to the arms of the cap sections as to swing and lock the sections in closing the razor.

4. In a safety razor, a cap lcomprising separate relatively movable, co-operating sections each formed with a guard member therein and mounted to swing about an axis outside the guard member.

`5. A safety razo'r having a, blade-supporting member, cap sections pivotally mounted respectively to swing about axes parallel to and Vremote from the edges of a blade on said support and each having a bar guard defining a'slot in the

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