AU612943B2 - Creación de Inventos y Patentes con Inteligencia Artificial

AU612943B2 – Dry-shaving apparatus comprising at least one shutter which is slidable on the apparatus housing
– Google Patents

AU612943B2 – Dry-shaving apparatus comprising at least one shutter which is slidable on the apparatus housing
– Google Patents
Dry-shaving apparatus comprising at least one shutter which is slidable on the apparatus housing

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Publication number
AU612943B2

AU612943B2
AU15116/88A
AU1511688A
AU612943B2
AU 612943 B2
AU612943 B2
AU 612943B2
AU 15116/88 A
AU15116/88 A
AU 15116/88A
AU 1511688 A
AU1511688 A
AU 1511688A
AU 612943 B2
AU612943 B2
AU 612943B2
Authority
AU
Australia
Prior art keywords
shutter
apparatus housing
housing
dry
shaving
Prior art date
1987-04-24
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Ceased

Application number
AU15116/88A
Other versions

AU1511688A
(en

Inventor
Arno Wolfger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Koninklijke Philips NV

Original Assignee
Philips Gloeilampenfabrieken NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1987-04-24
Filing date
1988-04-22
Publication date
1991-07-18

1988-04-22
Application filed by Philips Gloeilampenfabrieken NV
filed
Critical
Philips Gloeilampenfabrieken NV

1988-10-27
Publication of AU1511688A
publication
Critical
patent/AU1511688A/en

1991-07-18
Application granted
granted
Critical

1991-07-18
Publication of AU612943B2
publication
Critical
patent/AU612943B2/en

2008-04-22
Anticipated expiration
legal-status
Critical

Status
Ceased
legal-status
Critical
Current

Links

Espacenet

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Classifications

B—PERFORMING OPERATIONS; TRANSPORTING

B26—HAND CUTTING TOOLS; CUTTING; SEVERING

B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR

B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers

B26B19/12—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the oscillating- cutter type; Cutting heads therefor; Cutters therefor

B—PERFORMING OPERATIONS; TRANSPORTING

B26—HAND CUTTING TOOLS; CUTTING; SEVERING

B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR

B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers

B26B19/38—Details of, or accessories for, hair clippers, or dry shavers, e.g. housings, casings, grips, guards

B26B19/3806—Accessories

B26B19/382—Built-in accessories

B—PERFORMING OPERATIONS; TRANSPORTING

B26—HAND CUTTING TOOLS; CUTTING; SEVERING

B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR

B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers

B26B19/38—Details of, or accessories for, hair clippers, or dry shavers, e.g. housings, casings, grips, guards

B26B19/3853—Housing or handle

Description

PH087502 O R I G I N AL’ 61294 I. 9**ES* t~,
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*i 556065
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4 S *S 4 S .59
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0* S COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952-19B7 COMPLETE SPECIFICATION FOR THE INVENTION ENTIT(LF.: IlDry-shav~ng apparatus comprising at least, one shutter which Is slidable on the apparatus housing.» The following statement is a full description of this invention including the best method of performing it knowr to us:- -1- _1_1 25.2.91 PH087502 BACKGROUND OF THE INVENTION The invention relates to a dry-shaving apparatus comprising at least one shutter which is slidable on the apparatus housing for optionally covering or exposing a shear foil of the dry-shaving apparatus, and which is3 laterally guided at both sides in groove-shaped guides on the apparatus housing. Such a dry-shaving apparatus is known from DE-AS No. 11 22 410.
SUMMARY OF THE INVENTION It is the object of the in:uention to construct a dry-shaving apparatus of the type defined in the opening sentence in such a way that the shutter is readily slidable on the apparatus housing, without causing damage to the apparatus housing. To this end, according to the invention, the shutter-wall surface which faces the apparatus housing is spaced from che apparatus housing and at least one sliding guide .leans acts between the shutter and the apparatus housing to provide localized areas of contact between the shutter and the 20 apparatus housing in the sliding direction of the shutter. In this way, the shutter and the apparatus housing are designed to contact one another only over comparatively small areas instead of over a large area, so that the shutter is smoothly slidable over the 25 apparatus housing without any substantial friction.
Moreover, since the wall surface or the shutter is spaced from the housing, this ensures that during sliding of the ~shutter the apparatus housing is not damaged, and in particular is not scratched, which would adversely affect the appearance of these parts of the apparatus housing which are not covered by the shutter. In the case of a dry-shaving apparatus comprising a shaving head frame which is detachable secured to a basic apparatus and whose cross-members retain the shear foil, it is obvious that such a shaving-head frame must also be I I: I I 25.2.91 PH087502 9* 9 regarded as a part of the apparatus housing, so that such a sliding guide means may also be provided at the location of such a frame.
Preferably the sliding guide means comprises at least one rib which is oriented to act substantially in the sliding direction of the shutter.
Such a rib may be arranged, for example, on the shutter-wall surface which faces the apparatus housing.
However, it is especially preferred that the rib be arranged on the apparatus housing. Since the apparatus housing is generally made of a harder material than the shutter, the arrangement of the rib on the apparatus housing results in an improved sliding guide means, which also is less subject to wear.
In this respect it is also preferred that the shutter-wall surface which faces the apparatus housing be provided with a steel foil at least in the area of the shutter end which is remote from the shear foil, the shutter sliding on the rib with said steel foil. Such a steel foil constitutes a hard surface, which improves the characteristics of the sliding guide means and eliminates the rir.: of the rib on the apparatus housing digging into the shutter-wall surface which faces the apparatus housing, which could impair the easy slidability of the shutter and cause the shutter to contact the apparatus housing over a larger area and thereby scratch the apparatus housing. This step is of particular importance in the area of the shutter end which is remote from the shear foil, because at this area manual pressure is 30 applied when the shutter is moved and the sliding guide means is thus subjected to higher load.
Also, in especially preferred embodiments, taie sliding guide means comprises rolling elements which project from the apparatus housing and which are arranged in line with each other in the sliding direction of the
S
09S9 S r 9. 0 9 4995
O
99 9 9* S 25.2.91 4 PH087502 shutter. This also provides an effective sliding guidance for the shutter, which keeps the shutter spaced from the apparatus housing, th, shutter and the apparatus housing being in contact with ::ne another over very small areas. The rolling elements may comprise balls or rollers.
In this respect it is also found to be advantageous if the shutter-wall surface which faces the apparatus housing is provided with a groove which extends in the sliding direction of said shutter and which is engaged by the rolling elements of the sliding guide means arranged on the apparatus housing. Such a groove improves the characteristics of the sliding guide means for the shutter and also constitutes a rectilinear guide way for the shutter movement.
BRIEF DESCRIPTION OF THE DRAWING Some embodiments of the invention will now be described in more detail, by way of example, with reference to the accompanying drawings.
FIG. 1 shows a dry-shaving apparatus with a shutter P covering the shear foil, two sliding guide means acting between the shutter and the apparatus housing, which means each comprise a rib arranged on the apparatus housing.
25 FIG. 2 is a side view of the dry-shaving apparatus of FIG. 1.
FIG. 3 shows the dry-shaving apparatus of FIG. 1 000# with the shear foil exposed by the shutter.
FIG. 4, in side view and sectional view, shows a part of the shutter-guidance area.
I» FIG. 5 shows a shutter intended for use in a dryshaving apparatus as shown in FIG. 1 in a plan view at its wall surface which faces the apparatus housing of the dry-shaving apparatus on which it is mounted.
P/ FIG. 6, in the same way as FIG. 1, shows a dry-
I~
25.2.91 PH087502 shaving apparatus in which the sliding guide means comprise intersecting ribs arranged on the apparatus housing.
FIG. 7 in the same way as FIG. 1, shows a dryshaving apparatus in which the sliding guide means comprises rolling elements.
FIG. 8, in side view and in sectional view, shows a part of the shutter-guidance area in a dry-shaving apparatus as shown in FIG. 7.
FIG. 9 shows a shutter intended for use in a dryshaving apparatus as shown in FIG. 7 in a plan view at its wall surface which faces the apparatus housing of the dry-shaving apparatus on which it is mounted.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 2 show a dry-shaving apparatus comprising a bas. apparatus 1 and a shaving-head frame 2 mounted on this basic apparatus, together forming an apparatus housing 3, In a manner not shown, for example 20 by means of at least one resilient latch, the shaving head frame 2 is detachably secured to the basic apparatus 1, Such a shaving-head frame serves for holding an arruate shear foil, which in the situation of FIGS. 1 and 2 is covered completely by a shutter 4 to protect the 25 shear foil when the dry-shaving apparatus is not in use.
This shutter 4 is slidably arranged on the apparatus housing 3, the shutter being laterally guided at both sides in groove-shaped guides 5 And 6 in the apparatus housing 3, as indicated in broken lines in FIGS. 1 and 2.
The shutter 4 can be slid from the basic apparatus 1 onto the shaving-head frame 2 and the shear foil, for which purpose the shutter guides 5 and 6 in the basic apparatus 1 are continued in the side walls 7 and 8 of the shavinghead frame 2, where they are curved in conformity with Sthe curvature of the shear foil. If tes dry-shaving I -1 25.2.91 PH087502 apparatus is to be used, the shutter 4 is slid back from its position shown in FIGS. 1 and 2 onto the basic apparatus 1 to expose the shear foil for the purpose of shaving, as is shown in FIG 3, where it has been slid back so far that it is also clear of the shaving-head frame 2, enabling said frame to be removed from the basic apparatus 1, for example for cleaning purposes or for replacing the shear foil 10 which is retained by means of the cross-members 9 of the shaving-head frame 2. Such a shutter 4 is required to have a satisfactory stability in the transverse direction, so as to provide adequate protection for the shear foil 10, and to have a satisfactory flexibility in the longitudinal direction, so as to enable it to adapt itself to the shape of a shear foil 10 even if it has a comparatively sharr curvature. In order to meet such requirements the shutter comprises, for example, an elastic carrier and spaced-apart slots connected to said carrier.
Such a shutter is required to be readily slidable on 20 the apparatus housing and, as it is moved, it should not damage, in particular it should not scratch, the Sapparatus housing. In order to achieve this the wall, surface of the shutter 4 which faces the apparatus housing 3 is spaced from the apparatus housing 3 and at 25 least one sliding guide means acts between the shutter 4 and the apparatus housing 3 to provide localized areas of 5 contact between the shutter 4 and the apparatus housing 3 U in the sliding direction of the shutter.
As can be seen in FIG. 4, which shows a part around the area of the guide 5, groove-shaped guides 5 and 6, for laterally guiding the shutter 4 at both stides and which are engaged by, for example, lateral projections 6 i ‘of the shutter shown in FIG. 5, are formed in raised lateral wall portions 12 and 13 of the apparatus housing 3 and are situated at such a level that the wall surface ,4
A’>
0′ 0/
-U.
25.2.91 7 PH087502 14 of the shutter 4 which faces the apparatus housing 3 is spaced from the apparatus housing 3. This distance, designated a in FIG, 4, is selected in such a way that no contact over a larger area is possible between the wall surface 14 of the shutter 4 which faces the apparatus housing 3 and the apparatus housing 3, so that the shutter 4 is smoothly slidable over the apparatus housing 3 without any significant friction and so as to preclude damaging,in particular scratching, of the apparatus housing 3.
Moreover, between the shutter 4 and the apparatus housing 3 sliding guide means are provided, which in the present embodiment comprise two ribs 15 and 16 which extend in the sliding direction of the shutter and which are formed on the apparatus housing 3 and a’,so on the I cross-members 9 of the shaving-head frame 2, as can be seen in FIG. 3. The wall surface 14 of the shutter 4 which faces the apparatus housing 3 is in sliding contact with said ribs 15 and 16, so that there is only a 20 localized contact between the shutter 4 and the apparatus housing 3, because the shutter and the apparatus housing contact each other only over a comparatively small area.
In this way the ribs 15 and 16 locally support the shutter 4 and keep the wall surface 14 which face% the 25 apparatus housing 3 spaced from said housing 3, Such supporting means are important in order to elisure that the shutter 4 cannot bend under the influence of the manual pressure applied to it when it is slid over the apparatus housing 3, so that the specified distance a relative to the apparatus housing is always waintained.
Since in the present case the ribs 15 and 16 are arranged on the apparatus housing, it is preferred that they be made of the same comparatively hard material as the apparatus hnusing 3 resulting in a satisfactory sliding guidance an- hardly any wear. Since the material 25.2.91 8 PH087502 used for a shutter is generally not as hard as the material used for the apparatus housing, the ribs 15 and 16 may dig into the wall surface 14 of the shutter 4 which faces the apparatus housing 3, as a result of which the shutter may no longer be spaced at the correct distance from the apparatus housing. This applies in particular to the area of that end of the shutter 4 which is remote from the shear foil 10 and which in practice, in order to move the shutter, is gripped by hand and is therefore subjected to pressure, This end portion of the shutter may be specially constructed as a gripping element 17. In this respect, it is preferred in this area of the end portion of the shutter 4 that the shutter-wall surface 14 which faces the apparatus housing 3 be provided with a steel foil 18, as is shown in FIG.
Thus, the supporting surface for the ribs 15 and 16 on the shutter 4 is hard, has satisfactory sliding properties, and is not subject to wear. Obviously, it is 20 also possible to provide the entire waJ11 surface 14 o1 the shutter 4 which faces the apparatu~s houaing 3 with a steel foil. In the present embodiment the steel foil 18 extends substantially across the full width of the shutter 4, so that it is firmly attached to the shutter.
However, in principle, it is also possible to arrange 25 separate steel-foil port~ions only at the locations of the wall surface 14 of tQhe shutter 4 which are in direct contact with ribs 14, ainde In the embodiment shown In FIG. 6 the slidIng guide means also comprise ribs on the apparatus housing 3, namely ti,’ree ribs 1P’, 20 and 21 arranged, in an *o :intersecting st \r-shaped pattlorn, the ribs being oriented act substantially in ths, slidir g direction of the~ shutter 4. These ribs 19, 20~ and 21 function in the same way as the ribs 15 and 16 in the embodiment descAxtbed in the fore-going. If desired a further rib which extends -AlL 25.2.91 PHO87502 transversely through the star point m.uy be provided.
Obviously, further patterns of ribs which are essentially oriented in the direction of movement of the shutter are possible, such as for example, ribs which undulate in the sliding direction of the shutter.
In the embodiment shown in FIG. 7 two sliding guide means are provided comprising rolling elements, in the present case, balls which project from the apparatus housing 3 and which are disposed in line with each other in the sliding direction of the shutter 4, One sliding guide means then comprises the balls 22, 23 and 24 and the other sliding guide means comprises the balls 25, 26 and 27. In this way the sliding guide means provide localized areas of contact between the shutter 4 and the apparatus housing 3, the shutter and the apparatus too* housing being in contact with each other over very small areas corresponding to the ball portions projecting from the apparatus housing.
FIG. 8 shows the arrangement of the ball~s, for belle* 20 example of the ball 22, in the apparatus ho-,s-ng 3, each of the balls being mounted in a cage 29 whiqh is provided on the apparatus housing 3 and which is closed. by a cap 28, a portion of said ball being urged out of said cage through an opening 31 in the apparatus 1housing 3 under T.2$ the influence of a spring For the present sliding guide means It is found to be advrantageous if the wall, suxface 14 of the shutter 4 which faces the apparatus hoi-ising 3 is provided with grooves 132 and 33 which extend in the sliding d4rection 3 0 of the shutt,.er and which are associated with the two sliding gu.lde meatns, said grooves being engaged by the balls of the two sliding guide means on the apparatus housing 3. Th~Is Improves the properties of the sliding guide means for the shutter, while at the same time A rectilinear guideway for the movement of the shutter is I- w -V-1- 25.2.91 10 PH087502 obtained. The wall surface 14 of the shutter 4 which faces the apparatus housing 3 is then again situated at a distance a from the apparatus housing 3.
It is obvious that a series of modifications of the embodiments described in the foegoing are possible within the scope of the invention. This applies in particular to the arrangement and construction of the sliding guide means acting between the shutter and the apparatus housing.
S 2 *ee *00. o.

Claims (1)

25.2.91 PHOS 7502 *0 0 0 0000 *0009* 0 0*9*9* S SS S OOSSOS q, S S *000 S S *5 0 THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS: 1. A dry-shaving apparatus comprising at least one shutter which is sJlidable on the apparatus housing for optionally covering or exposing a shear foil of the dry- shaving apparatus, and which is laterally guided at both sides in groove-shaped guides on the apparatus housing, wherein the shutter-wall surface which faces the apparatus housing is spaced from the apparatus housing and at least one sliding guide means situated intermediate the lateral edges of the shutter acts between the shutter and the apparatus housing to provide localized areas of contact between the shutter and the apparatus housing In the sliding direction of the shutter. 2. A dry-shaving apparatus as claimed in claim 1, wherein the sliding guide means comprises at least one rib which Is oriented to act substantially In the sliding direction of the shutter. 3, A dry-shaving apparatus as claimed in claim 2., wherein the rib is arranged on the apparatus housing. 4 A dry-shaving apparatus as cl~aimed in claim 3, wherein the shutter-wall surface which faces the apparatus housing is provided with a steel foil In the area of the shutter end which is remote from the shear foil, -the shutter sliding on the rib with said, steel foil. A dry-shaving apparatus as claimed in claim 1, wherein the sliding guide means comprises separate roll~ing elements which project from the apparatus housing and which are disposed in line with each other in the sliding direction of the shutter, 6, A dry-shaving apparatus as claimed in claim wherein the shutter-wall surface which faces the apparatus housing Is provided with a groove which extends in the sliding direction of said shutter and which Is 00 00 q,»7 i I 25.2.91 12 PH087502 engaged by the rolling element \e sliding guide means arranged on the apparatus hou, 7. A dry-shaving apparatus c-_.prising at least one shutter which is slidable on the apparatus housing for optionally covering or exposing a shear foil of the dry- shaving apparatus, and which is laterally guided at both sides in groove-shaped guides on the apparatus housing, wherein the shutter-wall surface which faces the apparatus housing is spaced from the apparatus housing and at least one sliding guide means acts between the shutter and the apparatus housing to provide localized areas of contact between the shutter and the apparatus housing in the sliding direction of the shutter, said sliding guide means comprising at least one rib arranged on the housing and oriented to act substantially in the sliding direction of the shutter, and said shutter-wall •surface being provided with a steel foil in the area of the shutter end which is remote from the shear foil, the shutter sliding on the rib with said steel foil. 8. A dry-shaving apparatus comprising at least one shutter which is slidable on the apparatus housing for optionally covering or exposing a shear foil of the dry- sving apparatus, and which is laterally guided at b th sides in groove-shaped guides on the apparatus housing’:, wherein the shutter-wall surface which fa(. tue apparatus housing is spaced from the apparatus housing and at least one sliding guide means acts between the shutter and the apparatus housing to provide localized areas of contact between the shutter and the apparatus o. housing in the sliding direction of the shutter, said sliding guide means comprising separate rolling elements which project from the apparatus housing and which are disposed in line with each other in the sliding direction of the shutter. I W 25.2.91 13 PH087502 9. A dry-shaving apparatus as claimed in claim 8 wherein said rolling elements are balls, each ball being mounted In a cage which is closed by a cap, a portion ofJ the ball being urged out of said czage through an opening in the housing by a spring. Dated this twenty-fifth day of February, 1991. N.V. PHILIPS GLOEILAMPENFABRIEKEN. 049 0 so *901/ az

AU15116/88A
1987-04-24
1988-04-22
Dry-shaving apparatus comprising at least one shutter which is slidable on the apparatus housing

Ceased

AU612943B2
(en)

Applications Claiming Priority (2)

Application Number
Priority Date
Filing Date
Title

AT1026/87

1987-04-24

AT0102687A

AT386788B
(en)

1987-04-24
1987-04-24

DRY SHAVER WITH AT LEAST ONE ROLLER SHUTTER SLIDING ON THE APPARATUS HOUSE

Publications (2)

Publication Number
Publication Date

AU1511688A

AU1511688A
(en)

1988-10-27

AU612943B2
true

AU612943B2
(en)

1991-07-18

Family
ID=3505090
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

AU15116/88A
Ceased

AU612943B2
(en)

1987-04-24
1988-04-22
Dry-shaving apparatus comprising at least one shutter which is slidable on the apparatus housing

Country Status (10)

Country
Link

US
(1)

US4926551A
(en)

EP
(1)

EP0290071B1
(en)

JP
(1)

JP2557944B2
(en)

KR
(1)

KR970001154B1
(en)

CN
(1)

CN1010468B
(en)

AT
(1)

AT386788B
(en)

AU
(1)

AU612943B2
(en)

CA
(1)

CA1314390C
(en)

DE
(2)

DE8804972U1
(en)

ES
(1)

ES2023699B3
(en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

AT398721B
(en)

1992-05-19
1995-01-25
Koninkl Philips Electronics Nv

SHAVER WITH AN ADJUSTABLE TOOTH CUTTER

USD379012S
(en)

1994-11-07
1997-04-29
U.S. Philips Corporation
Dry shaver

Citations (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

DE1122410B
(en)

1960-09-05
1962-01-18

Ernst Moeckl

Cap for shaving heads of electric razors

Family Cites Families (3)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

GB876245A
(en)

1959-01-09
1961-08-30
Walter Rowland Hart
Dry shaving appliances

US3143796A
(en)

1963-02-08
1964-08-11
Ronson Corp
Electric head construction with movable slide cover

DE1553764A1
(en)

1967-01-13
1971-06-24
Ernst Moeckl

Razor

1987

1987-04-24
AT
AT0102687A
patent/AT386788B/en
not_active
IP Right Cessation

1988

1988-04-15
DE
DE8804972U
patent/DE8804972U1/de
not_active
Expired

1988-04-20
ES
ES88200755T
patent/ES2023699B3/en
not_active
Expired – Lifetime

1988-04-20
DE
DE8888200755T
patent/DE3863479D1/en
not_active
Expired – Lifetime

1988-04-20
EP
EP88200755A
patent/EP0290071B1/en
not_active
Expired – Lifetime

1988-04-21
CA
CA000564782A
patent/CA1314390C/en
not_active
Expired – Fee Related

1988-04-21
CN
CN88103017A
patent/CN1010468B/en
not_active
Expired

1988-04-21
US
US07/184,309
patent/US4926551A/en
not_active
Expired – Fee Related

1988-04-21
JP
JP63096946A
patent/JP2557944B2/en
not_active
Expired – Fee Related

1988-04-22
AU
AU15116/88A
patent/AU612943B2/en
not_active
Ceased

1988-04-23
KR
KR1019880004607A
patent/KR970001154B1/en
active
IP Right Grant

Patent Citations (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

DE1122410B
(en)

1960-09-05
1962-01-18
Ernst Moeckl

Cap for shaving heads of electric razors

Also Published As

Publication number
Publication date

AU1511688A
(en)

1988-10-27

EP0290071A1
(en)

1988-11-09

ATA102687A
(en)

1988-03-15

CN88103017A
(en)

1988-11-02

CA1314390C
(en)

1993-03-16

AT386788B
(en)

1988-10-10

ES2023699B3
(en)

1992-02-01

US4926551A
(en)

1990-05-22

DE3863479D1
(en)

1991-08-08

KR970001154B1
(en)

1997-01-29

KR880012319A
(en)

1988-11-26

DE8804972U1
(en)

1988-06-09

CN1010468B
(en)

1990-11-21

JP2557944B2
(en)

1996-11-27

JPS63283678A
(en)

1988-11-21

EP0290071B1
(en)

1991-07-03

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