Cutlery – Razors – Multiple blade
Patent
1992-11-12
1995-05-23
Payer, Hwei Siu
Cutlery
Razors
Multiple blade
30 57, B26B 2116
Patent
active
054169747
DESCRIPTION:
BRIEF SUMMARY
This invention relates to safety razors and to blade units for incorporation in safety razors.
The invention aims at the provision of a safety razor having a high degree of "conformance", that is to say the ability to permit or constrain the skin-engaging elements of the razor to maintain optimum contact with the varying contours of the skin during a shaving operation.
In accordance with a feature of the present invention, a blade unit for a safety razor comprises a blade having a sharpened cutting edge and a blade support comprising a platform to which the blade is attached with its edge projecting forwardly of the platform, characterized in that the support further comprises an integral guard portion spaced forwardly of the blade edge, and mounting means on the support by which the integral guard and blade are mounted in use in a razor head, for rotation together about an axis parallel with and close to the blade edge.
The invention also includes a safety razor including a head frame in which at least one such blade unit is mounted for rotation about the said axis.
Preferably, the (or each) unit is also mounted for movement relative to the frame under forces encountered during shaving, against the action of a resilient restoring force, in directions transverse (i.e. substantially perpendicular) to a notional plane containing the blade edge and a skin engaging surface of the guard portion.
A blade unit and safety razor head frame in accordance with the invention and some modifications thereof, will now be described, by way of example, with reference to the accompanying drawings, in which:
FIGS. 1 and 2 are perspective views of an end portion of the head frame and of a blade unit, respectively;
FIG. 3 is a cross-section taken at the sectioning line in FIG. 1, showing the blade units and a cap member in the normal positions of rest;
FIG. 4 corresponds with FIG. 3, and shows the parts in different relative positions;
FIG. 5 is a diagrammatic cross-section illustrating different positions of the cap and blade units in use;
FIG. 6 is an exploded perspective view of a modified razor head frame and blade units; and
FIG. 7 is a cross-section of the head frame of FIG. 6, corresponding with FIG. 5.
The razor head shown in FIGS. 1 to 4 comprises a metal or moulded plastics head frame 1 having an elongate base 2 and upstanding end walls 3 at opposite ends thereof. Only one end of the frame is shown in these Figs. the opposite end being a mirror image.
The head frame supports a cap member 4, two blade units 5 and three pairs of cantilever wire springs 6, whose inner ends (not shown) are secured to the medial portion of the elongate base.
Each blade unit 5 consists of a narrow blade 7, having a sharpened cutting edge 7A, and a blade support 8 formed as an L-shaped metal stamping to provide a platform 9 and a guard portion providing a curved skin engaging guard surface 11 and a depending leg 12. The support has a slot 13 over most of its length to form a space between the platform 9 and the guard portion and the blade 7 is securely attached to the platform with its edge 7A projecting forwardly into that space, forwardly of the platform.
At its ends, the support 8 is formed with upwardly offset, projecting ears 14 which are abuttingly engaged from below by upstanding end portions 6A of the wire springs 6.
The cap member 4 consists of a channel shaped support 16 in which a cap moulding 17 is secured.
The cap member and blade units are captured at their ends in recesses formed in the end walls 3 of the head frame. More specifically, the ears 14 of the blade supports engage in narrow vertical slots 18 which also receive the vertical end portions 6A of the respective wire springs. Alongside each slot 18 is a shallower, wider recess 19 whose forward face 21 acts as a stop for the adjacent end of the respective leg 12.
Thus, each blade unit is guided for vertical movement in the head frame by engagement of its ears 14 in the slots 18. The springs 6 are pre-stressed so that in the normal, rest position, the blade units are held
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Payer Hwei Siu
The Gillette Company
Tobin Donal B.
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