US1821072A - Safety razor - Google Patents

Description

l Sept l, 1931 w. H. PARRY 1,821,072

SAFETY RAZOR Filed May l5. 1929 /4 n /NVENTU/Q..

ZZ y

Patented Sept. 1, 1931 i UNITED STATES PATENT OFFICE WILLIAM H. PARRY, OF MALDEN, MASSACHUSETTS, ASSGNOR T GILLETTE SAFETY RAZOR COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF DELAWARE SAFETY RAZOR e Application filed May 15,

rI`his invention rrelates to safety razors of the type in which a cap and a guard member are adapted to be clamped together upon a thin flexible blade to hold it in position for sharing. or to be separated to release the blade for itunoval-and replacement.

lt is desirable in a razor of this type that the clamping engagement of the cap and guard should he ellected quickly in preparlng the razor forl use and that theyshould be disengaged with equal facility after use when it is desired to remove the blade and clean the razor. It is also important that the engagement of the cap and guard should 'ie made firmly under adequate.- pressure and f reliably maintained while the razor is being used. The latter condition is essential because any loosening of the razor parts perniittiug an increase of the edge exposure of the blade while the razor is being used renders it extremely dangerous to the user.

I hare discovered a construction which successfully meets the requirements above outlined and possesses also the mechanical advantages of compactness in design and convenience of manufacture.

In one aspect accordingly my invention consists in a safety razor comprising a cap having a stud With an enlarged head provided with a longitudinal passage in one side thereof, a guard and a handle adapted to clamp the two together by interlocking with the stud of the cap and for this purpose having a bore of sullicient diameter to receive the head of the stud and an internal projection adapted to pass through the passage therein and interlocking with it.. By providing an inclined Contact face' between the internal projection of the handle and the cap stud. the cap and guard may be drawn together under powerful pressure by a slight rotation of the handle, and when the desired "clamping engagement has4 been once effected there is no tendency, while the razor is being used, to disturb this relation.

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 1929. Serial No. 363,247.

illustration and shown in the accompanying drawings in which:

Fig. 1 is a view in perspectiveol the cap memlzer of the razor.

Fig. 2 is a view in perspective of the handle with portions broken away.

Fig. l is a sectional view ofthe cap member.

Fig. 4 is a view of the razor partly in elevation -and partly in section, showing the parts thereof assembled but not clamped.

Fig. 5 is a sectional view of the line 5 5 of Fig. 4.

Fig. (i is a view similar to Fig/1 but showing parts of the razor in clamped condition, and

Fig. 7 is a sectional View on the line 7-7 of Fig. 6.

In the preferred embodiment of the razor, the cap 10 comprises a transversely curved bar having an inner concave blade-shaping surface andan exterior convex face. From the concave face of the cap extends a pair of cylindrical locating studs 12 spaced equally from the ends of the cap. A center stud 14 also projects from this surface, being provided with a collar 15 adjacent tothe face of the cap and with an enlarged cylindrical head 16 at its outer end. The inner or overhanging face ofthe head 16 is inclined or spiral in shape, for a purpose which will presently appear, and one. side of the head 16 is provided with a longitudinally extending groove or channel 17.

The guard member 22 of the razor is perforated to receive the locating studs 12 and the center stud 14. It is provided at either edge with a series of guard teeth and with a lblade-engaging face having a pair of parallel fulcrum shoulders 23 similar to those of the guard member disclosed in U. S. Patent No. 1328.024 granted January 13, 1920. In the assembled razor the flexible blade is bent over the shoulders 23 by the concave bladeshaping face of the cap.

The handle of the razor may be of any desired shape so long as it cooperates with the center stud 1l of the cap member. As herc- 4in shown the handle 2l is tubular in forni and somewhat concave at its inner end so as to present a fair bearing against the outer face of the guard 22. In its diameter the .bore of the handle is substantially equal to the diameter of the cylindrical head 16 of the cap stud. Adjacent' to its end the bore is provided `With an internal rib 26 corresponding' in cross section substantially to the cross sectional area of the channel 17in the head 16 of the cap stud and of such length as to it With a slight clearance beneath the overhanging surface ofthe 'head 16 when the parts of the razor are assembled in their respective initial positions as shown in Fig. 4. The rib 28 at its outer end extends substantially flush with, the end or giard engaging face of the handle.

Y The blade 2() comprises a thin flexible douj ble-edged blade perforatedto receive the locating studs 12 and the collar 15 of the center cap stud 14. The blade is accurately positioned transversely between the cap and` guard by these studs andV is curved into substantial vconformity to the concavev face of the cap 10 Awhen the parts are drawn into clamping relation.

l'ln assembling the illustrated razor for use, the parts are brought together in the condition shown in Fig. 4, thatfis to say, the blade 20 and the guard 22 are threaded upon the studs of the cap 10 andthe center stud.

14 is inserted in the bore of the handle, the rib 26 passing through the channel 1 7 .oithe head 16. The shape and slope .of the overhanging or undercut surface of the head 16 is such that when the handle 24is turned in a clockwise direction as seen in Figs. 5 and 7 the inner end of the rib 26 will coact with the overhanging surface. of the stud tov draw the stud inwardly and'move it into clamping relation with the guard 22, as shown in Fig. j

6. In eiecting this motion the rib 26 which originally coincides in angular position with the channel or groove 17 is moved angularly through substantially 12() degrees to the dotted line position indicated inFig. 7. It may be noted that the collar 15. adjacent to the cap 10 extends beyond a line joining the effective edges of the cap, thus ensuring registration ofthe collar with the holey in the vthe 'ixed end'of said stud ttingwithin the hole' said guard plate, said collar extending beyond a line joining the longitudinal edges of said cap, and said stud having a vneck'of reduced diameter connecting said collars. j M

2. A safety razorcomprising aoap and a cooperating guard adapted to hold a blade between them, ashort stud projecting loutwardly from the blade engagin yface of the cap and having a cylindrical en argementat its free end7 a handle having an end face for engaging the guard and a cylindrical bore in one end for receiving and fitting said enlargement, the inner .en'dwall of the enlargement being inclined tol provide a vc'am like shoulder, and one side portion of tlie enlargement being slotted from its outer .end through the said inclined Walhand lan inwardly projecting lug of substantial length,l located Within the bore ofthe handle and ex-` tending to the guard engaging face thereof for passing through the slot and engaging against the 'said end wall, av portion of the stud inwardly from said end vvv'all being of reduced diameter.

Signed at Boston, Massachusetts, thisl4th day of May, 1929.

guard plate before the application of tension to the blade 20 by rotation of handle 24. In order to release the cap and guard from `clamping position it is necessary onlyfto turn the handle back to its initial position bringing the rib 26 again into registration with the groove 17, vvhereupon the cap is ree to be separated from the guard, the head 16 being free to be longitudinally removed out of the bore of the handle.

Having thus disclosed my invention and described' a preferred embodiment thereof,

`what I claim as new and desire to secure by Letters Patent is f 1. A safety razor comprising a guard plate having a blade shaping surface and a WILLIAM PARRY,

noI

Images