CA1219983A - Pushbutton switch assembly with integrated lock-down switch - Google Patents
Pushbutton switch assembly with integrated lock-down switchInfo
- Publication number
- CA1219983A CA1219983A CA000458577A CA458577A CA1219983A CA 1219983 A CA1219983 A CA 1219983A CA 000458577 A CA000458577 A CA 000458577A CA 458577 A CA458577 A CA 458577A CA 1219983 A CA1219983 A CA 1219983A
- Authority
- CA
- Canada
- Prior art keywords
- lock
- switch assembly
- pushbutton
- pushbutton switch
- trip cam
- 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.)
- Expired
Links
Landscapes
- Push-Button Switches (AREA)
Abstract
Abstract of the Disclosure The present invention relates to a pushbutton switch assembly for use with telephone sets, having an integrated lock-down switch (1). With the aid of a rotatable trip cam (3) of the lock-down switch (1), randomly one of several domes (6) of a rubber-like switching mat (5) of the pushbutton switch assembly can be actuated, so that certain operational conditions can be switched.
(Fig.2)
(Fig.2)
Description
il ~ 3 The present invention relates to a pushbutton switch assembly for use with telephone sets haviny a printed circuit pro-vided with contacts and conductors and a swi-tching mat oE elastic material placed thereover, which comprises domes associated with pushbutton keys, and in -the cavities of which the moving contacts are accommodated.
Such pushbutton switch assemblies with a pri.nted circuit as the base for the fixed contacts, and a switching mat as the base for the moving contaets are already known, for example, from the German Published Patent Applica-tion (DE-OS) 30 33 134. The switeh-ing mat eonsists of rubber or of a rubber-elastie plastics material and is provided with dome-like archings which are associated with the pushbutton keys. Inside the arehing there is positioned a moving eontaet whieh, upon depressing a pushbutton key, comes in touch with the corresponding fixed contact on the printed circuit.
With modern types of telephone sets, such pushbutton switch assemblies employing switchi.ng mats, are used to an increas-ing ex-tent as pushbutton dialling units. Moreover, in the case of :inte:rcommunication and secretarial systems, for switching the ~0 operational states, such as for programming service features or blocking -toll line authorisations, there is required an additional loek-down switch. This loek-down switch is a separa-te structural unit which eonsists of a loek cylinder with a removable key, with a eam capable of rotating about the cylinder axis, cooperating with contact springs, being connected to the lock cylinder. All parts are accommodated in a cylindrical housing of plastics material which is either screwed to the chassis of the telephone set, or can be attaehed thereto in a form-fit eonnection (German Utili-ty Model --.
(DE-GM) 75 28 008).
It is an object of the present invention to in-tegrate -the lock-down switch into the pushbutton swi-tch assembly. This objec-t is achieved by employment of a lock-down switch, whose lock cylinder comprises a rotatable trip cam, disposed in such a way above the switching mat that a dome becomes operable upon rotation of the trip cam. By the configuration according -to the invention there is attained the advantage -that a separate lock-down switch group becomes superfluous. The space required for this and -the wiring can be used otherwise. Both the construction ar;d the assem-bly of the -telephone set are more simple and inexpensive than with conventional types. Also the retrofitting can be carried out easily because no soldering work is required. The wiring is already provided for in a printed circuit.
The invention will now be described in grecter detail with reference to examples of embodiments shown in Figures 1 to 4 of the accompanying drawings, in which:
Figure 1 shows a lock-down switch according to the inven-tion, in a neutral position be-tween two switching-mat domes, in a cross-sectional view, Figure 2 shows the same lock-down switch as in Figure 1, but in the actuated pcsition above one dome of the switching mat, Figure 3 shows a modified design of the lock-down switch in -the non-actuated position above a dome of the switching mat, and Figure 4 shows the lock-down switch of Figure 3 in the actuated position.
In the pushbutton switch assembly as shown in Figures 1 and 2, a switching mat 5 having dome-shaped convexities 6 is dis--
Such pushbutton switch assemblies with a pri.nted circuit as the base for the fixed contacts, and a switching mat as the base for the moving contaets are already known, for example, from the German Published Patent Applica-tion (DE-OS) 30 33 134. The switeh-ing mat eonsists of rubber or of a rubber-elastie plastics material and is provided with dome-like archings which are associated with the pushbutton keys. Inside the arehing there is positioned a moving eontaet whieh, upon depressing a pushbutton key, comes in touch with the corresponding fixed contact on the printed circuit.
With modern types of telephone sets, such pushbutton switch assemblies employing switchi.ng mats, are used to an increas-ing ex-tent as pushbutton dialling units. Moreover, in the case of :inte:rcommunication and secretarial systems, for switching the ~0 operational states, such as for programming service features or blocking -toll line authorisations, there is required an additional loek-down switch. This loek-down switch is a separa-te structural unit which eonsists of a loek cylinder with a removable key, with a eam capable of rotating about the cylinder axis, cooperating with contact springs, being connected to the lock cylinder. All parts are accommodated in a cylindrical housing of plastics material which is either screwed to the chassis of the telephone set, or can be attaehed thereto in a form-fit eonnection (German Utili-ty Model --.
(DE-GM) 75 28 008).
It is an object of the present invention to in-tegrate -the lock-down switch into the pushbutton swi-tch assembly. This objec-t is achieved by employment of a lock-down switch, whose lock cylinder comprises a rotatable trip cam, disposed in such a way above the switching mat that a dome becomes operable upon rotation of the trip cam. By the configuration according -to the invention there is attained the advantage -that a separate lock-down switch group becomes superfluous. The space required for this and -the wiring can be used otherwise. Both the construction ar;d the assem-bly of the -telephone set are more simple and inexpensive than with conventional types. Also the retrofitting can be carried out easily because no soldering work is required. The wiring is already provided for in a printed circuit.
The invention will now be described in grecter detail with reference to examples of embodiments shown in Figures 1 to 4 of the accompanying drawings, in which:
Figure 1 shows a lock-down switch according to the inven-tion, in a neutral position be-tween two switching-mat domes, in a cross-sectional view, Figure 2 shows the same lock-down switch as in Figure 1, but in the actuated pcsition above one dome of the switching mat, Figure 3 shows a modified design of the lock-down switch in -the non-actuated position above a dome of the switching mat, and Figure 4 shows the lock-down switch of Figure 3 in the actuated position.
In the pushbutton switch assembly as shown in Figures 1 and 2, a switching mat 5 having dome-shaped convexities 6 is dis--
- 2 -posed over a printed circuit 4 having the fixed con-tacts and con-ductors 8. The printed circuit 4 is Eormed by a printed circuit board or a conductor foil. The switching rna-t 5 consis-ts of an elastic, rubber-like plas-tics material.
Inside the domes 6 oE the switching mat 5 there are the moving contacts 7 which cooperate with the fixed contacts 8 on the printed circuit 4. When the assembly is used with a pushbutton dialling unit for telephone sets, the domes are actuated by push-buttons placed respectively above them, but not shown in the accompanying drawings.
Between respectively two domes 6 there is disposed one lock-down switch 1 whose lock cylinder 2 is provided at i-ts lower end with a rotatable trip cam 3 formed by a wing-type attachment of the lock cylinder 2 (as seen in Figures 1 and 2). The rotation of both the lock cylinder and its trip cam is effected, in the usual way, with the aid of a (not shown) key. In Figure 1, the trip cam
Inside the domes 6 oE the switching mat 5 there are the moving contacts 7 which cooperate with the fixed contacts 8 on the printed circuit 4. When the assembly is used with a pushbutton dialling unit for telephone sets, the domes are actuated by push-buttons placed respectively above them, but not shown in the accompanying drawings.
Between respectively two domes 6 there is disposed one lock-down switch 1 whose lock cylinder 2 is provided at i-ts lower end with a rotatable trip cam 3 formed by a wing-type attachment of the lock cylinder 2 (as seen in Figures 1 and 2). The rotation of both the lock cylinder and its trip cam is effected, in the usual way, with the aid of a (not shown) key. In Figure 1, the trip cam
3 is shown in its neutral center position between two domes 6 of the switching mat 5. As is indicated by the double arrow, it can be rotated in both directions about its axis. In Figure 2, it is ~Q shown to have been -turned to the left and to have depressed in the course of this, the left-hand dome 6, so that the contact 7 thereof comes in touch with the contact 8 on the printed circuit. The domes 6 associated with the lock-down switch are provided for in addition to the pushbutton-actuated domes on the switching mat.
It is sufficient to provide two domes, but equally well also four domes may be disposed in such a way around the lock cylinder as to become operable by the trip cam 3 thereof. In cases where the lock-down switch 1 is required not at all, there is merely ., ~ - 3 -omit-ted the lock cylinder, and the corresponding opening in the control panel is closed by means of a (not shown) dummy plug.
Conversely, in retrofitting the telephone set, the dummy plug is replaced by a lock-down switch.
In the type of embodiment as shown in Figures 3 and 4, unlike in the previously described type of embodiment, the lock-down switch 1 is disposed coaxially above one dome 6 of the switch-ing mat 5. Accordingly, only one dome can be actuated.
In this case, the trip cam 3 of the lock cylinder 2 con-sists of a bevel of the lower end of the rotatable portion of thelock-down switch. This cam 3 is opposed by the complimentarily bevelled end of a coaxially disposed plunger 9 which is supported capable of being moved in the axial direction only. If now, the cam 3 is turned from the position as shown in Figure 3 into the position as shown in Figure ~, the plunger 9, in accordance with the inclination of the bevels on both the cam and the plunger, is moved downwardly towards the dome 6, causing the latter to be depressed, so that the contacts 7 and 8 come in touch with one ~nother. Upon turning back the lock-down switch 1, the plunger 9 reassumes its normal position.
, . ,~
It is sufficient to provide two domes, but equally well also four domes may be disposed in such a way around the lock cylinder as to become operable by the trip cam 3 thereof. In cases where the lock-down switch 1 is required not at all, there is merely ., ~ - 3 -omit-ted the lock cylinder, and the corresponding opening in the control panel is closed by means of a (not shown) dummy plug.
Conversely, in retrofitting the telephone set, the dummy plug is replaced by a lock-down switch.
In the type of embodiment as shown in Figures 3 and 4, unlike in the previously described type of embodiment, the lock-down switch 1 is disposed coaxially above one dome 6 of the switch-ing mat 5. Accordingly, only one dome can be actuated.
In this case, the trip cam 3 of the lock cylinder 2 con-sists of a bevel of the lower end of the rotatable portion of thelock-down switch. This cam 3 is opposed by the complimentarily bevelled end of a coaxially disposed plunger 9 which is supported capable of being moved in the axial direction only. If now, the cam 3 is turned from the position as shown in Figure 3 into the position as shown in Figure ~, the plunger 9, in accordance with the inclination of the bevels on both the cam and the plunger, is moved downwardly towards the dome 6, causing the latter to be depressed, so that the contacts 7 and 8 come in touch with one ~nother. Upon turning back the lock-down switch 1, the plunger 9 reassumes its normal position.
, . ,~
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A pushbutton switch assembly, comprising a printed circuit provided with contacts and conductors and a switching mat of elastic material placed thereover, which comprises domes associated with pushbutton keys, and in the cavities of which the moving contacts are accommodated, wherein a lock-down switch, whose lock cylinder comprises a rotatable trip cam, is integrated into said pushbutton switch assembly and is disposed in such a way above the switching mat that a dome becomes operable upon rotation of the trip cam.
2. A pushbutton switch assembly as claimed in claim 1, wherein said trip cam is formed by the bevelled end of said lock cylinder and acts upon the oppositely complementarily bevelled end of a coaxially disposed, axially displaceable plunger whose other end actuates said dome.
3. A pushbutton switch assembly as claimed in claim 1, wherein said trip cam is formed by a wing-type attachment of said lock cylinder, which acts upon said dome.
4. A pushbutton switch assembly as claimed in claim 3, wherein said lock-down switch is in such a way disposed between said domes that by said trip cam each time one of at least two neighbouring domes is capable of being actuated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000458577A CA1219983A (en) | 1984-07-11 | 1984-07-11 | Pushbutton switch assembly with integrated lock-down switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000458577A CA1219983A (en) | 1984-07-11 | 1984-07-11 | Pushbutton switch assembly with integrated lock-down switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1219983A true CA1219983A (en) | 1987-03-31 |
Family
ID=4128287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000458577A Expired CA1219983A (en) | 1984-07-11 | 1984-07-11 | Pushbutton switch assembly with integrated lock-down switch |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1219983A (en) |
-
1984
- 1984-07-11 CA CA000458577A patent/CA1219983A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |