US4087909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry shaver
Assignee: Sharp Corp
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Filing: 1972-07-20
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Granted: 1978-05-09
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Expires: 1992-07-20
Abstract
Abstract A dry shaver comprising one or more pairs of shear plates having a comb shape and rotary blades in contact with the shear plates which slide on said shear plates while rotating. The rotary blades of each pair of shear plates are supported at only two points within the shaver case and rock or incline with the supporting points acting as fulcra, whereby a close fit to the curved surface of the skin is achieved.
Inventors
- 👤 Akio Naemura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:57
CPC Classifications
B; B26; B26B; B26B19/00; B26B19/14; B26B19/145
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
163 words
A dry shaver comprising a casing including a holder provided with at least one opening in the head thereof, a shear plate suspended to be tiltable with respect to the direction perpendicular to the central longitudinal axis of the casing, a rotary blade operatively associated with said shear plate, a driving means, and a drive shaft for coupling the rotary blade to the driving means, said rotary blade being fixed to a drive shaft with no play therebetween, and a compression spring provided between the driving means and the drive shaft for forcing the rotary blade to the shear plate, thereby making the compression force of the compression spring against the rotary blade and thus the shear plate parallel to the driving shaft and perpendicular to the shear plate at all times, said drive shaft being supported at the lower end thereof in a manner to be universally tiltable with respect to the direction parallel to the central longitudinal axis of the casing.
Claim 2
Dependent Claim
163 words
A dry shaver comprising a casing including a holder provided with at least one opening in the head thereof, a shear plate suspended to be tiltable with respect to the direction perpendicular to the central longitudinal axis of the casing, a rotary blade operatively associated with said shear plate, a driving means, and a drive shaft for coupling the rotary blade to the driving means, said rotary blade being fixed to a drive shaft with no play therebetween, and a compression spring provided between the driving means and the drive shaft for forcing the rotary blade to the shear plate, thereby making the compression force of the compression spring against the rotary blade and thus the shear plate parallel to the driving shaft and perpendicular to the shear plate at all times, said drive shaft being supported at the lower end thereof in a manner to be universally tiltable with respect to the direction parallel to the central longitudinal axis of the casing.
Claim 3
Dependent Claim
33 words
The dry shaver of claim 1, wherein a pair of supporting means for the shear plate is disposed on both sides of the shear plate to serve as a pair of fulcra therefor.
Claim 4
Dependent Claim
34 words
The dry shaver of claim 2, wherein the supporting means has two edges which serve as fulcrum and the shear plate is mounted on the edges thereof, thereby permitting the shear plate to slant.
Claim 5
Dependent Claim
47 words
The dry shaver of claim 3, wherein the shear plate has two recesses adapted to receive the respective edges of the supporting means so that when each edge is fitted in the respective recess the shear plate is prevented from rotating in union with the rotary blade.
Claim 6
Dependent Claim
26 words
The dry shaver of claim 1, comprising a plurality of openings provided in the holder with a shear plate tiltably disposed within each of said openings.
Claim 7
Dependent Claim
26 words
The dry shaver of claim 5, further including a plurality of retaining means for preventing the respective shear plate from slipping out through the respective opening.
Claim 8
Dependent Claim
19 words
The dry shaver of claim 6, wherein a rotary blade is rotatably associated with each of said shear plates.
Claim 9
Dependent Claim
66 words
The dry shaver of claim 7, wherein a pair of supporting means for the shear plate is disposed on both sides of the shear plate to serve as a pair of fulcra therefor, said supporting means being so arranged that the amplitude of the rocking motion of each shear plate is a maximum at a point nearest to or remotest from the center of the holder.
Claim 10
Dependent Claim
33 words
The dry shaver of claim 8, wherein the supporting means are substantially on a straight line perpendicular to a plane containing the center of the shear plate and the center of the holder.
Claim 11
Dependent Claim
49 words
The dry shaver of claim 2, wherein fitting junctures are provided between the supporting means and the holder, each fitting juncture composed of a projection on the supporting means and a recess on the holder, said recess adapted to receive the projection and thus serve as a positioning means.
Claim 12
Dependent Claim
49 words
The dry shaver of claim 2, wherein fitting junctures are provided between the supporting means and the holder, each fitting juncture composed of a projection on the holder and a recess on the supporting means, said recess adapted to receive the projection and thus serve as a positioning means.
Claim 13
Dependent Claim
40 words
The dry shaver of claim 2, wherein a projection is provided on either the shear plate or the supporting means and a corresponding hole for rotatably receiving said projection is provided on either the shear plate or the supporting means.
Claim 14
Dependent Claim
55 words
The dry shaver of claim 1, wherein a hole is provided in the leg portion of the rotary blade and a tip is provided at the upper end of the driving shaft, the diameter of the hole being substantially the same as that of the tip for joining the rotary blade with the driving shaft.
Claim 15
Dependent Claim
41 words
The dry shaver of claim 1, wherein a driving gear is associated with the driving means, said driving gear containing an aperture adapted to receive the driving shaft, said aperture being slightly larger than the peripheral surface of the driving shaft.
Claim 16
Dependent Claim
34 words
The dry shaver of claim 14, wherein the driving shaft is provided at its base with a flange, the aperture in said driving gear being slightly larger than the peripheral surface of said flange.
Claim 17
Dependent Claim
79 words
The dry shaver of claim 1, wherein a cover is provided for separating the driving means from the head of the shaver and a retainer which extends to the outside of the shaver is slidably disposed above said cover, the space defined by said retainer and said cover housing the compression spring so that when the retainer is displaced against the repulsive force of the spring, the head of the shaver is disengaged from the body of the shaver.
Claim 18
Dependent Claim
146 words
A dry shaver comprising: (a) a shaver housing including a shaving head having at least one opening therein, (b) a shear plate disposed within said opening and adapted for tilting relative thereto and with the edge of said opening forming a fixed outer stop therefor, said shear plate including a cylindrical wall, (c) a floating rotary cutting element disposed within said shear plate and tiltably supporting the latter, (d) a rigid fixed inner shear plate stop member removably secured in said head, (e) and cooperative interlocking means on said shear plate and on said fixed stop member to prevent shear plate rotation at any tilted position thereof during rotation of said cutting member, said interlocking means comprising: (1) recess means comprising at least one notch formed in said cylindrical wall, (2) and a fixed projection formed in said rigid stop member and disposed within said notch.
Claim 19
Dependent Claim
146 words
A dry shaver comprising: (a) a shaver housing including a shaving head having at least one opening therein, (b) a shear plate disposed within said opening and adapted for tilting relative thereto and with the edge of said opening forming a fixed outer stop therefor, said shear plate including a cylindrical wall, (c) a floating rotary cutting element disposed within said shear plate and tiltably supporting the latter, (d) a rigid fixed inner shear plate stop member removably secured in said head, (e) and cooperative interlocking means on said shear plate and on said fixed stop member to prevent shear plate rotation at any tilted position thereof during rotation of said cutting member, said interlocking means comprising: (1) recess means comprising at least one notch formed in said cylindrical wall, (2) and a fixed projection formed in said rigid stop member and disposed within said notch.
Claim 20
Dependent Claim
28 words
The shaver of claim 17 in which said fixed projection comprises a post of fixed length disposed within said notch throughout the full range floating shear plate positions.
Claim 21
Dependent Claim
54 words
The shaver of claim 18 in which: (a) said stop member includes an inner transverse planular portion from which said post extends, and (b) the length of said post is such that, upon inward floating shear plate movement, said post will bottom within said notch and constitute the inner stop for said shear plate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |