US4417397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric shaver
Assignee: Panasonic Electric Works Co Ltd
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Filing: 1982-06-04
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Granted: 1983-11-29
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Expires: 2002-06-04
Abstract
Abstract An electric shaver incorporating an elastomeric, unitary, diaphragm suction pump driven from an eccentric off the cutting blade driving motor. A channel is formed about the cutting head in communication with the suction pump. During shaving, the suction pump creates a partial vacuum in the channel about the cutting head whereby the skin is drawn into the channel and, thereby, stretched across and against the cutting head. Axial sliding of the cutting head and/or a collar surrounding the channel can be employed in addition to provide self-adjustability.
Inventors
- 👤 Masami Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:46
CPC Classifications
B; B26; B26B; B26B19/00; B26B19/38; B26B19/44
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
89 words
In an electric shaver comprising a housing with a powered shaving head for severing whiskers, the improvement comprising: (a) a raised area in the housing surrounding the shaving head to form a channel around the shaving head; and (b) powered suction pump means disposed in said housing and communicating with said channel for creating a sucking force within said channel when the shaver is positioned against the skin for shaving to draw the skin into said channel such that the skin is stretched across and against the shaving head.
Claim 2
Dependent Claim
89 words
In an electric shaver comprising a housing with a powered shaving head for severing whiskers, the improvement comprising: (a) a raised area in the housing surrounding the shaving head to form a channel around the shaving head; and (b) powered suction pump means disposed in said housing and communicating with said channel for creating a sucking force within said channel when the shaver is positioned against the skin for shaving to draw the skin into said channel such that the skin is stretched across and against the shaving head.
Claim 3
Dependent Claim
15 words
The shaver of claim 1 and additionally comprising: a removable filter disposed in said channel.
Claim 4
Dependent Claim
42 words
The shaver of claim 2 wherein: said filter comprises two spaced concentric cylindrical members open at one end adjacent said cutting head and closed together at the opposite end to form an annular cup within said channel opening adjacent said cutting head.
Claim 5
Dependent Claim
44 words
The shaver of claim 1 wherein said raised area comprises: (a) a cylindrical collar disposed in the housing around the shaving head, said collar being axially slidable between extended and retracted positions; and including, (b) means for biasing said collar towards said extended position.
Claim 6
Dependent Claim
37 words
The shaver of claim 1 or claim 4 and additionally comprising: (a) the shaver head being mounted for axial movement between extended and retracted positions; and, (b) means for biasing the shaving head towards said extended position.
Claim 7
Dependent Claim
13 words
The shaver of claim 1 wherein: said suction pump is a diaphragm pump.
Claim 8
Dependent Claim
62 words
The shaver of claim 6 wherein: (a) shaver includes an electric motor having a drive shaft extending from either end with the shaving head being operably connected to one end of said shaft to be driven thereby; and additionally, (b) an eccentric is connected to be driven by the other end of said shaft and operably connected to drive said diaphragm pump.
Claim 9
Dependent Claim
123 words
The shaver of claim 7 wherein: said suction pump comprises a unitary member of an elastomeric material forming a diaphragm and two flapper valves disposed in a passageway in said body communicating with said channel such that said eccentric pulls on said diaphragm to thereby create a partial vacuum within said passageway, open a first one of said flapper valves disposed on the inlet side, and hold the other of said flapper valves disposed on the outlet side closed to draw air into the chamber within said passageway between said flapper valves and then releases the pull on said diaphragm whereby the elastomeric material retracting closes said first flapper valve, allows the other flapper valve to open, and expels air from said chamber.
Claim 10
Dependent Claim
111 words
An electric shaver comprising: (a) a hollow body portion having a head opening therein; (b) a cutting head disposed in said head opening to form a channel disposed about said head; (c) a suction pump disposed within said body with an inlet in communication with said channel and an outlet in communication with the atmosphere; and, (d) means disposed in said body portion for driving said cutting head and said suction pump whereby a partial vacuum is created in said channel around said cutting head when said cutting head is being driven to thereby draw the skin into said channel and thereby stretched across and against said cutting head during shaving.
Claim 11
Dependent Claim
111 words
An electric shaver comprising: (a) a hollow body portion having a head opening therein; (b) a cutting head disposed in said head opening to form a channel disposed about said head; (c) a suction pump disposed within said body with an inlet in communication with said channel and an outlet in communication with the atmosphere; and, (d) means disposed in said body portion for driving said cutting head and said suction pump whereby a partial vacuum is created in said channel around said cutting head when said cutting head is being driven to thereby draw the skin into said channel and thereby stretched across and against said cutting head during shaving.
Claim 12
Dependent Claim
15 words
The shaver of claim 9 and additionally comprising: a removable filter disposed in said channel.
Claim 13
Dependent Claim
42 words
The shaver of claim 10 wherein: said filter comprises two spaced concentric cylindrical members open at one end adjacent said cutting head and closed together at the opposite end to form an annular cup within said channel opening adjacent said cutting head.
Claim 14
Dependent Claim
46 words
The shaver of claim 9 and additionally comprising: (a) a collar disposed within said head opening adjacent the outer periphery thereof, said collar being axially slidable between extended and retracted positions within said head opening; and, (b) means for biasing said collar towards said extended position.
Claim 15
Dependent Claim
37 words
The shaver of claim 9 or claim 12 and additionally comprising: (a) said cutting head being mounted for axial movement between extended and retracted positions; and, (b) means for biasing said cutting head towards said extended position.
Claim 16
Dependent Claim
13 words
The shaver of claim 9 wherein: said suction pump is a diaphragm pump.
Claim 17
Dependent Claim
60 words
The shaver of claim 14 wherein: (a) said driving means comprises an electric motor having a drive shaft extending from either end with said cutting head being operably connected to one end of said shaft to be driven thereby; and additionally, (b) an eccentric driven by the other end of said shaft and operably connected to drive said diaphragm pump.
Claim 18
Dependent Claim
123 words
The shaver of claim 15 wherein: said suction pump comprises a unitary member of an elastomeric material forming a diaphragm and two flapper valves disposed in a passageway in said body communicating with said channel such that said eccentric pulls on said diaphragm to thereby create a partial vacuum within said passageway, open a first one of said flapper valves disposed on the inlet side, and hold the other of said flapper valves disposed on the outlet side closed to draw air into the chamber within said passageway between said flapper valves and then releases the pull on said diaphragm whereby the elastomeric material retracting closes said first flapper valve, allows the other flapper valve to open, and expels air from said chamber.
References Cited (Backward Citations)
US2083579A
Cited
US2376197A
Cited
GB784909A
Cited
US2802260A
Cited
US2916821A
Cited
US3328430A
Cited
US3571926A
Cited
US4150483A
Cited
US4219931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |