Cutlery – Razors – With cooperating shearing blades
Patent
1995-03-28
1996-09-10
Watts, Douglas D.
Cutlery
Razors
With cooperating shearing blades
3034651, B26B 1904
Patent
active
055533833
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a shaving foil mounting structure for a dry shaving apparatus, comprising a shaving foil of arched form attached to a shaving head frame by means of bolts or the like, against which foil an inner cutter operating in a reciprocating motion is resiliently engaged, the foil having on its longitudinal sides a strip member each which is provided with mounting members cooperating with the bolts.
In prior known shaving foil mounting structures of this type (DE-11 68 796 and DE-20 19 746 B2), there are attached to the longitudinal sides of the shaving foil inner surface, that is, to the shaving foil surface cooperating with the inner cutter, a strip member each which has resilient arms configured in the manner of an eyelet and embracing the bolts in the manner of a snap fastener. This results in a certain amount of flexibility of the mounting structure, enabling the shaving foil to recede towards the interior of the shaving head frame together with the inner cutter under the action of the shaving pressure. To prevent the undesired effect of the shaving foil being movable in the direction of the operating motion of the inner cutter, means acting by frictional or positive engagement are provided. While such known shaving foil mounting structures have resulted in an appreciable advance as compared with earlier, substantially rigid, mounting structures, they are yet worthy of improvement particularly as regards their manipulation. It is in particular the insertion and removal of the shaving foil into and, respectively, from the shaving head frame using a motion essentially normal to the frame inner surface, the probing for the bolt-and-hole connection as the shaving foil is inserted, as well as the overcoming of the closing force of the snap fastener for detachment that tend to present difficulties for the user, resulting in damage to the shaving foil.
It is accordingly an object of the present invention to provide a shaving foil mounting structure which affords substantially greater ease of assembly and demounting of the shaving foil, combined with low space requirements in the interior of the shaving head frame, while maintaining the above-identified advantages of prior known mounting structures.
According to the present invention, this object is accomplished by the means identified in the characterizing portion of the main claim.
The shaving foil mounting structure of the present invention has the advantage that assembly and detachment of the shaving foil to and from the shaving head frame are accomplished using a simple sliding motion lengthwise of the frame inner wall or alternatively, at right angles thereto, with the detent and locating means taking effect automatically. The shaving foil is practically not exposed to mechanical loads, and the inner cavity of the shaving head frame enclosed by the shaving foil remains free from the mounting members. This in turn enables the complete shaving head to be built to narrow dimensions, if so desired, and to be cleaned very easily.
The movable detent means provided within the cutouts may be configured and arranged in a variety of ways; particularly advantageously, the present invention prefers a hook member extending upwardly from the base of the respective cutout towards the opening thereof, which hook member is movable in the plane of the strip member transversely to the sliding motion as the shaving foil is inserted. This enables the strip member to be built to relatively narrow dimensions while its length which is determined by the dimensions of the shaving foil is unchanged. Preferably, the angled ends of the two hook members of a strip member are arranged so as to face each other; this results in a yielding motion of the hook members in opposite directions as the shaving foil is locked in place or unlocked, avoiding a one-sided lateral displacement or interlocking.
In an advantageous embodiment of the present invention, the bolts are of a rectangular cross-section and are provided with a dovetail guide each on one of the two longitudinal
REFERENCES:
patent: 2360679 (1944-10-01), Holsclaw
patent: 3440725 (1969-04-01), Messinger et al.
patent: 4726116 (1988-02-01), Schweingruber et al.
patent: 4991295 (1991-02-01), Messinger
Braun Aktiengesellschaft
Watts Douglas D.
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