GB2026242A - Rotary switch - Google Patents
Rotary switch Download PDFInfo
- Publication number
- GB2026242A GB2026242A GB7830700A GB7830700A GB2026242A GB 2026242 A GB2026242 A GB 2026242A GB 7830700 A GB7830700 A GB 7830700A GB 7830700 A GB7830700 A GB 7830700A GB 2026242 A GB2026242 A GB 2026242A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stem
- printed
- wiring board
- board
- posts
- Prior art date
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
- H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
- H01H19/56—Angularly-movable actuating part carrying contacts, e.g. drum switch
- H01H19/58—Angularly-movable actuating part carrying contacts, e.g. drum switch having only axial contact pressure, e.g. disc switch, wafer switch
- H01H19/585—Angularly-movable actuating part carrying contacts, e.g. drum switch having only axial contact pressure, e.g. disc switch, wafer switch provided with printed circuit contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
- H01H21/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
- H01H2019/008—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand with snap mounting of rotatable part on fixed part, e.g. rotor on stator, operating knob on switch panel
Abstract
A rotary switch having fixed contacts which are formed on a printed- wiring board (1) comprises a rotatable part (38) which is made of a plastics material and carries wiper blades 45c, 46d provided with contacts 45e, 46f for selective cooperation with the fixed contacts on the printed-wiring board, and a stationary part (19) which is also made of a plastics material and which is attached to the printed-wiring board and supports the rotatable part 38. The stationary part comprises a stem (20) on which the rotatable part is rotatably mounted and which extends through a hole 31 in the printed-wiring board and comprises means (37) which engage with the far side of the board to secure the stationary part 19 to the board in a direction parallel to the axis of the stem. The stationary part further comprises posts (21, 22, 23) which are disposed on that side of the printed-wiring board on which the fixed contacts are formed, and which are spaced radially from the stem and fit in further holes 29 in the board 1 to secure the stationary part 19 against lateral displacement. <IMAGE>
Description
SPECIFICATION
Rotary switch
The invention relates to a rotary switch having fixed contacts which are formed on a printed-wiring board.
It is an object of the invention to provide a rotary switch of simple construction which is cheap to produce.
According to the invention there is provided a rotary switch comprising a plurality of fixed contacts formed on one side of a printed-wiring board, a rotatable part which is made of a plastics material and which carries at least one pair of electricallyconnected wiper blades provided with contacts for selective cooperation with the fixed contacts on the printed-wiring board, and a stationary part which is also made of a plastics material and which is attached to the printed-wiring board and supports the rotatable part, the stationary part comprising a stem having a cylindrical portion which is disposed on said one side of the printed-wiring board and on which the rotatable part is rotatably mounted, and a portion which extends through a first hole in the printed-wiring board and comprises means which engage with the other side of the board to secure the stationary part to the board in a direction parallel to the longitudinal axis of the stem, and the stationary part further comprising a plurality of posts which are disposed on said one side of the prinodfted-wiring board and are spaced radially from the stem and extend parallel thereto and which fit in further holes in the printed-wiring board to secure the stationary part against displacement relative to the board in any direction in a plane parallel to the board.
The switch thus comprises three basic components, namely, the printed-wiring board and the two parts which are made of a plastics material and one of which carries the wiper blades. These three components can all be manufactured at low cost, as also can the wiper blades, and are easily assembled.
In one embodiment of the invention the posts of the stationary part are formed with shoulders which abut said one side of the printed-wiring board.
These shoulders in conjunction with the means which engage the other side of the printed-wiring board provide a very simple method of securing the stationary part to the board.
The means which engage with the other side of the printed-wiring board may consist of a nut on a screw-threaded portion of the stem of the stationary part, which portion extends through the first hole in the printed-wiring board. Alternatively, said means may be formed by the head of a screw which extends through said hole and screws into a screwthreaded axial bore in the stem of the stationary part.
In a preferred embodiment of the invention, however, the first hole in the printed-wiring board is circular and that portion of the stem of the stationary part which extends through this hole is cylindrical and is constructed to fit closely in the hole, and said stem is hollow and has a free end for insertion in said first hole and has an external taper at this end and is formed with a plurality of slots which are spaced about the longitudinal axis of the stem and each of which extends axially of the stem along part of the length thereof from the free end of the stem and opens out of this end of the stem so that resiliently deflexible portions of the stem are left between the slots, and on the outer side of each of these portions, at or near the free end thereof, a projection is formed having a first face which slopes in a direction similar to the taper on the free end of the stem, and a second face which forms a shoulder on the stem for engagement with said other side of the printed-wiring board,
This construction facilitates the assembly of the switch since, after the rotatable part, with the wiper blades attached to it, has been fitted on the stem of the stationary part, the latter part is attached to the printed-wiring board simply by pressing the stem and the posts of the stationary part into the respective holes in the board with manual pressure.
In the above preferred embodiment of the invention, the shoulders on the stem of the stationary part may lie in a plane which is perpendicular to the longitudinal axis of the stem and which, prior to the attachment of the stationary part to the printedwiring board, is spaced from the plane containing the shoulders on the posts of the stationary part by a distance less than the thickness of the board, and the posts may be connected to the stem by arms which extend radially from the stem and which are resiliently deflexible so as to permit an axial movement of the stem relative to the posts such that the distance between said planes can be increased at least to equal the thickness of the printed-wiring board.
During the attachment of the stationary part to the printed-wiring board the distance between the two planes is increased by applying axial pressure to the stem when the shoulders on the posts have come into abutment with the aforesaid one side of the printed-wiring board, until the shoulders on the stem have passed through the respective hole in the board and, under the resilience of the portions of the stem on which these shoulders are formed, have sprung outwards to engage with the other side of the board. The stem is then released and the resilience of the radial arms by which the posts are connected to the stem pulls the shoulders on the stem back against the printed-wiring board, so that the board is clamped between the shoulders on the stem and the shoulders on the posts.
The rotatable part of the switch may comprise an annular disc on one side of which said pair of wiper blades is mounted and which is formed at its centre with a bush which fits rotatably on the stem of the stationary part.
To provide a simple means of determining a series of switching positions for the rotatable part of the switch, one of the rotatable and stationary parts may be formed with a series of teeth which extends along an arc whose centre of curvature lies on the rotational axis of the rotatable part, and the other of said parts may be formed with a resilient member which, by rotational movement of the rotatable part, is selectively engageable between adjacent teeth of said series to locate the rotatable part in a corres ponding position about said axis.
The rotatable part may be formed with an arcuate slot whose centre of curvature lies on the rotational axis of the rotatable part and through which passes one of the posts of the stationary part, this post serving as a stop for cooperation with the ends of the arcuate slot to limit the rotational movement of the rotatable part.
The rotatable part may be formed with a radial projection which serves as a finger-grip.
The or each pair of wiper blades may form part of a metal wiper element comprising a medial portion which is secured to the rotatable part of the switch from which the two blades extend in opposite directions, the blades being integral with the medial portion and being formed with the respective contacts at or near their free ends.
A rotary switch according to a preferred embodiment of the invention will now be described with reference to the accompanying drawings, in which:
Figure lisa plan view of the complete switch including the printed-wiring board,
Figure 2 is a plan view of the printed-wiring board,
Figure 3 is an underneath view of the switch with the printed-wiring board removed,
Figure 4 is an axial sectional view of the switch taken on the line IV-IV of Figures 1 and 3, and
Figure 5 is a perspective view of a housing containing the switch and associated electrical components.
Referring now to the drawings, on the printedwiring board 1 of the switch are formed fixed contacts designated 2 to 18 inclusive (Figure 2). On the upper, printed side of the board 1 is mounted a stationary part 19 which is made of a plastics material and which comprises a central cylindrical stem 20 and three cylindrical posts 21, 22 and 23 spaced radially from the stem 20 and extending parallel thereto. The posts 21, 22 and 23 are formed on arms 24, 25 and 26 which extend radially from a central disc-shaped portion 27 of the part 19, which portion is formed at one end of the stem 20 and is concentric with the stem. The posts are spaced at equal radial distances from the stem 20 and at equal angular distances around the stem, but neither of these spacing arrangements is essential.Also, although three posts are preferred, only two are essential and more than three may be provided if desired. At their distal ends the posts have portions 28 of reduced diameter which engage with a push fit in circular holes 29 in the printed-wiring board 1. The reduction in the diameter of the posts forms shoulders 30 on the posts, which shoulders abut the upper side of the board 1. For this reason the shoulders 30 are all arranged in one plane perpendicular to the longitudinal axes of the posts. The reduced portions 28 of the posts may be slightly tapered to facilitate their entry into the holes 29 in the printed-wiring board when the switch is being assembled, should the posts not all be in exact axial alignment with the respective holes 29 due to manufacturing tolerances.
The cylindrical stem 20 is hollow and fits in a circular hole 31 in the printed-wiring board 1. For this reason the outer diameter of the stem is substantially equal to the diameter of the hole 31, except at the free end of the stem, which is the end remote from the disc-shaped portion 27 of the part 19, where the outer diameter of the stem gradually-decreases so that the stem has a slight external taper 32 at this end to facilitate its initial engagement in the hole 31 when the switch is being assembled. The stem 20 is formed with three slots 33 which are spaced equally about the longitudinal axis of the stem and each of which extends axially of the stem along part of the length thereof from the free end of the stem and opens out of this end of the stem.Between the slots are left three resilientlydelfexible portions 34 of the stem, and at or near the free end of each of these portions, on the outer side thereof, is formed a projection 35 having a face 36 which slopes in a similar direction to the taper 32 on the stem 20 and a face 37 which forms a shoulder on the stem facing in the opposite direction to the shoulders 30 on the posts 31, 32,33. When the stem 20 is inserted in the hole 31 during the assembly of the switch, the portions 34 of the stem are first deflected inwards by the cooperation between the sloping faces 36 of the projections 35 and the edge of the board 1 at the periphery of the hole 31 as the projections enter the hole.When the projections 35 have passed through the hole 31, the stem portions 34 resile so that the shoulders formed by the faces 37 of the projections 35 engage beneath the underside of the printedwiring board 1. This occurs just after the shoulders 30 on the posts 21,22 and 23 abut the upper side of the board 1. For this reason the shoulders 37 on the stem 20 are arranged in a plane which is perpendicularto the longitudinal axis of the stem and which, prior to the attachment of the part 19 to the board 1, is spaced from the plane containing the shoulders 30 on the posts 21,22 and 23 by a distance slightly less than the thickness of the board 1.Also, the cross section of the radial arms 24,25 and 26 on which the posts 21, 22 and 23 are formed is such that these arms are resiliently deflexible to an extent sufficient to permit a slight axial movement of the stem 20 relative to the posts so that when the shoulders 30 on the posts have abutted the upper side of the board 1, the shoulders 37 on the stem can be moved in to engage beneath the underside of the board.
This leaves the arms 24,25 and 26 in a slightly stressed condition in which they pull the shoulders 37 back against the underside of the board 1,so that the board is clamped between the shoulders 30 and the shoulders 37. This attachment of the part 19 of the switch to the printed-wiring board is carried out simply by the application of manual pressure. The part 19 is held firmly against displacement relative to the board in the axial direction, i.e., the direction of the longitudinal axis of the stem 20, by the engagement of the shoulders 30 and 37 with opposite sides of the board, and in the rotational direction, i.e., about the axis of the stem 20, by the engagement of the reduced portions 28 of the posts 21,22,23 in the holes 29 in the board.
Rotatably mounted on the stem 20, between the disc-shaped portion 27 of the part 19 of the switch and the printed-wiring board 1, is a rotatable part 38 of the switch. This part is also made of a plastics material and comprises an annular disc 39 formed at
its centre with a bush 40 which fits rotatably on the
stem 20 of the part 19, and at its periphery with a
cylindrical wall 41. Spaced radially from the wall 41
in the outward direction is a part-cylindrical wall 42
whose centre of curvature lies on the central axis of
the disc 39 and which is connected to the wall 41 by a
web 43. In the web 43 is formed an arcuate slot 44
whose centre of curvature also lies on the central
axis of the disc 39 and through which passes one of
the posts ofthe part 19, namely, the post 23.This
post serves as a stop for cooperation with the ends
of the slot 44 to limit the rotational movement of the
part 38. A radial projection 42a on the wall 42 forms a
finger-grip for rotating the part 3.
On the underside of the disc 39, i.e., the side
nearerthe printed-wiring board, is mounted a plural
ity of metal wiper elements, in this case three,
designated 45,46 and 47 (Figure 3.) Each of these
elements is formed in one piece from metal strip and
comprises a medial portion 45a, 46a and 47a respec
tively which is secured to the disc 39 by a rivet 45b,
46b and 47b respectively, and a pair of resilient
wiper blades 45e and d, 46c and dand 47e and d,
respectively, which are integral with and extend in
opposite directions from the medial portion.The
wiper blades 45cand d, 46c and dand 47e and dare
formed at or near their free ends with domed
contacts 45e and f, 46e and fand 47e and
respectively, for cooperation with the fixed contacts
on the printed-wiring board 1. The contacts on the
wiper blades are biassed against the upper side of
the board 1 by the resilience of the blades, which are
inclined away from the disc 39 towards the printed
wiring board. The contacts may be pressed from the
wiper blades.To locate the wiper elements in the
respective positions shown in Figure 3 and preclude
any possibility of the elements being rotationally
displaced from these positions about the rivets 45b,
46b and 47b, the medial portion 45a, 46a and 47a
respectively of each wiper element is formed with a
straight edge 45g, 46g and 47g respectively which
cooperates with an associated straight-sided protru
sion 45h, 46h and 47h respectively on the surface of
the disc 39. Each medial portion is also formed
opposite its straight edge 45g, 46g and 47g respec
tively with a tongue 45i, 46i and 47i respectively
which is held in a slot in a further associated protrusion 45j, 46j and 47j respectively on the
surface of the disc 39.
To determine a series of switching positions for
the rotatable part 38 of the switch, this part is formed
on the inner side of its cylindrical wall 41 with two
diametrically opposed series of rounded teeth 48
and 49 (Figure 1), and the stationary part 19 of the
switch is formed with two resiliently deflexible
arcuate arms 50 and 51 having protrusions 50a and
51a on their free ends, each of which protrusions
engages between two adjacent teeth of the series of
teeth 48 or 49 respectively to locate and hold the part
38 of the switch in a corresponding position about its
rotational axis. Instead of having the teeth 48 and 49
on the part 38 and the arms 50 and 51 on the part 19,
the teeth could be formed on the part 19 and the
arms on the part 38.Also, although two are prefer
red, one series of teeth and one arm would suffice.
Of the fixed contacts on the printed-wiring board 1,the contacts 2,4,5,7,8,12,16,17 and 18 are formed by arcuate conductive tracks having a common centre of curvature which lies on the rotational axis of the part 38 of the switch. The fixed contacts are arranged on a number of imaginary circles of different radii concentric with the rotational axis of the part 38. The contact 18 is located on a first circle, which has the smallest radius, contact 17 on a second circle, contacts 8 to 16 on a third circle, contacts 5,6 and 7 on a fourth circle and contacts 2,3 and 4 on a fifth circle.The movable contacts on the part 38 are also arranged on these circles; contacts 45e and fbeing situated on the third circle, contacts 46a and fon the fifth and second circles respectively, and contacts 47e and fon the fourth and first circles respectively. Thus, the movable contacts 45e and f are cooperable with the fixed contacts 8 to 16, the movable contact 46e with the fixed contacts 2, 3 and 4, the movable contact 46f with the fixed contact 17, the movable contact 47e with the fixed contacts 5, 6 and 7, and the movable contact 47fwith the fixed contact 18.
As already explained, the part 38 is rotatable through a series of positions which are determined by the teeth 48 and 49, and in each of these positions each of the wiper elements 45, 46 and 47 bridges two of the fixed contacts on the printed-wiring board to make a connection between these contacts. Thus, a series of selectable connections and combinations of connections is available. This makes the switch very suitable for use in the control of a model railway.
Figure 5 is an external view of a model railway controller incorporating a rotary switch of the above construction and associated electrical components, for example, a transformer. These components and the switch are contained in a housing 52 having a slot 53 through which the finger-grip 42a of the switch projects.
A switch of the above construction can be manufactured at low cost. Apart from a housing, which could be produced cheaply by moulding from a plastics material, the switch consists solely of the printed-wiring board, the two parts which are made of a plastics material and which can each readily be moulded in one piece, and the wiper elements, which are cheap to produce and are easily attached to the rotatable part of the switch, for example by riveting, as in the embodiment illustrated. The switch is quickly and easily assembled. First, the rotatable part of the switch, with the wiper elements attached to it, is fitted on the central stem of the stationary part, and subsequently, by the application of manual pressure, the central stem and the posts of the stationary part are pressed into the respective holes in the printed-wiring board.
Claims (10)
1. A rotary switch comprising a plurality of fixed contacts formed on one side of a printed-wiring board, a rotatable part which is made of a plastics material and which carries at least one pair of electrically-connected wiper blades provided with contacts for selective cooperation with the fixed contacts on the printed-wiring board, and a station ary part which is also made of a plastics material and which is attached to the printed-wiring board and supports the rotatable part, the stationary part comprising a stem having a cylindrical portion which is disposed on said one side of the printed-wiring board and on which the rotatable part is rotatably mounted, and a portion which extends through a first hole in the printed-wiring board and comprises means which engage with the other side of the board to secure the stationary part to the board in a direction parallel to the longitudinal axis of the stem, and the stationary part further comprising a plurality of posts which are disposed on said one side of the printed-wiring board and are spaced radially from the stem and extend parallel thereto and which fit in further holes in the printed-wiring board to secure the stationary part against displacement relative to the board in any direction in a plane parallel to the board.
2. A rotary switch as claimed in Claim 1, wherein the posts of the stationary part are formed with shoulders which lie in one plane perpendicular to the longitudinal axes of the posts and abut said one side ofthe printed-wiring board.
3. A rotary switch as claimed in Claim 1 or 2, wherein the first hole in the printed-wiring board is circular and that portion of the stem of the stationary part which extends through this hole is cylindrical and is constructed to fit closely in the hole, and wherein said stem is hollow and has a free end for insertion in said first hole and has an external taper at this end and is formed with a plurality of slots which are spaced about the longitudinal axis of the stem and each of which extends axially of the stem along part of the length thereof from the free end of the stem and opens out of this end of the stem so that resiliently deflexible portions of the stem are left between the slots, and wherein on the outer side of each of these portions, at or near the free end thereof, a projection is formed having a first face which slopes in a direction similar to the taper on the free end of the stem, and a second face which forms a shoulder on the stem for engagement with said other side of the printed-wiring board.
4. A rotary switch as claimed in Claims 2 and 3, wherein the shoulders on the stem of the stationary part lie in a plane which is perpendicular to the longitudinal axis of the stem and which, prior to the attachment of the stationary part to the printedwiring board, is spaced from the plane containing the shoulders on the posts of the stationary part by a distance less than the thickness of the board, and wherein the posts are connected to the stem by arms which extend radially from the stem and which are resiliently deflexible so as to permit an axial movement of the stem relative to the posts such that the distance between said planes can be increased at least to equal the thickness of the printed-wiring board.
5. A rotary switch as claimed in any preceding claim, wherein the rotatable part comprises an annular disc on one side of which said pair of wiper blades is mounted and which is formed at its centre with a bush which fits rotatably on the stem of the stationary part.
6. A rotary switch as claimed in any preceding claim, whereon one of the rotatable and stationary parts is formed with a series of teeth which extends along an arc whose centre of curvature lies on the rotational axis of the rotatable part, and the other of said parts is formed with a resilient member which, by rotational movement of the rotatable part, is selectively engageable between adjacent teeth of said series to locate the rotatable part in a corresponding position about said axis.
7. A rotary switch as claimed in any preceding claim, wherein the rotatable part is formed with an arcuate slot whose centre of curvature lies on the rotational axis of the rotatable part and through which passes one of the posts of the stationary part, this post serving as a stop for cooperation with the ends of the arcuate slot to limit the rotational movement of the rotatable part.
8. A rotary switch as claimed in any preceding claim, wherein the rotatable part is formed with a radial projection which serves as a finger-grip.
9. A rotary switch as claimed in any preceding claim, wherein the or each pair of wiper blades forms part of a metal wiper element comprising a medial portion which is secured to the annular disc of the rotatable part and from which the two blades extend in opposite directions, the blades being integral with the medial portion and being formed with the respective contacts at or near their free ends.
10. A rotary switch constructed and arranged to operate substantially as herein described with reference to the accompanying drawings.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7830700A GB2026242B (en) | 1978-07-21 | 1978-07-21 | Rotary switch |
| DE19797919534 DE7919534U1 (en) | 1978-07-21 | 1979-07-07 | Rotary switch |
| FR7918823A FR2431759A3 (en) | 1978-07-21 | 1979-07-20 | ROTARY SWITCH |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7830700A GB2026242B (en) | 1978-07-21 | 1978-07-21 | Rotary switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2026242A true GB2026242A (en) | 1980-01-30 |
| GB2026242B GB2026242B (en) | 1982-07-21 |
Family
ID=10498579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7830700A Expired GB2026242B (en) | 1978-07-21 | 1978-07-21 | Rotary switch |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE7919534U1 (en) |
| FR (1) | FR2431759A3 (en) |
| GB (1) | GB2026242B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4368365A (en) * | 1979-10-18 | 1983-01-11 | Valeo | Switching device, notably for the control of an electrical motor in an automotive vehicle |
| US4739138A (en) * | 1985-10-30 | 1988-04-19 | Braun Aktiengesellschaft | Rotary electrical switch |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3040546C2 (en) * | 1980-10-28 | 1983-04-07 | Siemens AG, 1000 Berlin und 8000 München | Coding switch |
| FR2696272B1 (en) * | 1992-09-29 | 1994-12-30 | Jaeger | Electric switch especially for motor vehicles with limited space. |
-
1978
- 1978-07-21 GB GB7830700A patent/GB2026242B/en not_active Expired
-
1979
- 1979-07-07 DE DE19797919534 patent/DE7919534U1/en not_active Expired
- 1979-07-20 FR FR7918823A patent/FR2431759A3/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4368365A (en) * | 1979-10-18 | 1983-01-11 | Valeo | Switching device, notably for the control of an electrical motor in an automotive vehicle |
| US4739138A (en) * | 1985-10-30 | 1988-04-19 | Braun Aktiengesellschaft | Rotary electrical switch |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2431759B3 (en) | 1980-11-14 |
| GB2026242B (en) | 1982-07-21 |
| DE7919534U1 (en) | 1979-11-15 |
| FR2431759A3 (en) | 1980-02-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |