Cutlery – Razors – With cooperating shearing blades
Patent
1992-02-06
1993-04-13
Yost, Frank T.
Cutlery
Razors
With cooperating shearing blades
30 4391, B26B 1902
Patent
active
052017818
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a dry shaving apparatus comprising a pair of parallel elongate shaving heads having their inner cutters resiliently mounted on a common coupling member which is detachably coupled to the drive member of the electric drive.
A dry shaving apparatus of the type initially referred to is known from JP-U 57-135 365. As becomes apparent from FIGS. 2 and 3 of this specification, the drive means for the two parallel inner cutters is comprised of a single component, that is, an oscillating bridge, a coupling member integrally formed on the oscillating bridge, and two drive pins which are integrally formed on the coupling member and on which the inner cutters are resiliently mounted and held by means of a clip connection.
From DE-OS 2,624,601 a dry shaving apparatus with parallel shaving heads is known in which the inner cutters are detachably arranged on a common coupling member. The coupling member is resiliently mounted on the drive member and coupled thereto by means of a swivel-type fastener. During shaving, this type of resilient support for the inner cutters does not permit separate spring loading of the respective inner cutters in dependence on the different skin--engaging pressures to which they are exposed.
It is an object of the present invention to provide a dry shaving apparatus of the type initially referred to in such a manner as to afford reliability and ease of handling, coupling and decoupling of its inner cutters together with a drive member of the dry shaving apparatus, while the resilient support and engagement associated with each inner cutter upon and, respectively, with the upper cutter or cutters are maintained.
According to the present invention, this requirement is satisfied in an apparatus of the type initially referred to in that the coupling member is coupled to the drive member by means of a bearing pin engaging in a bearing bore provided in the drive member, the coupling member being held in abutting engagement with the drive member by means of at least one spring element locking into a prismatic groove having two beveled surfaces and provided on the bearing pin, the spring element resting resiliently against one of the beveled surfaces in the locked position, and the locking device which is comprised of the spring element and the prismatic groove being releasable from its locking engagement against the pressure of the spring element by means of one of the beveled surfaces of the prismatic groove against which the spring element rests.
The coupling of the two inner cutters to a drive member of the electric drive by means of a common coupling member -- while the resilient support and engagement associated with each inner cutter upon and, respectively, with the upper cutter or cutters are thus maintained -- affords, apart from its ease of handling, the particular advantage of being suitable for use in both dry shaving apparatus having a pivoted shaving head (FIGS. 1, 2 and 3) and dry shaving apparatus in which the shaving head is detachable from the casing but otherwise immovably arranged thereon. This type of coupling allows ready removal of the assembly comprised of the two inner cutters and the coupling member either for replacement due to wear of the inner cutters or for improved cleaning of the assembly, including the respective shaving head frame.
Reliable abutting engagement of the coupling member with the drive member regardless of tolerances is ensured in that the beveled surfaces of the prismatic groove on the bearing pin have different gradients, the beveled surface with the smaller gradient being acted upon by the spring element in the coupled condition of coupling member and drive member.
A particularly advantageous embodiment of the invention is characterized in that the bearing bore terminates in a hollow space provided in the drive member, and that the spring element includes at least one spring arm which extends into the hollow space and is integrally formed on the drive member in an extension of the bearing bore.
In a variation of this embodime
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patent: 4700476 (1987-10-01), Locke et al.
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Durr Helmut
Heintke Hans-Eberhard
Jestadt Albrecht
Braun Aktiengesellschaft
Payer Hwei-Siu
Yost Frank T.
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