GB2049254A - Electric alarm bells - Google Patents
Electric alarm bells Download PDFInfo
- Publication number
- GB2049254A GB2049254A GB8009212A GB8009212A GB2049254A GB 2049254 A GB2049254 A GB 2049254A GB 8009212 A GB8009212 A GB 8009212A GB 8009212 A GB8009212 A GB 8009212A GB 2049254 A GB2049254 A GB 2049254A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gong
- electrical connection
- mounting plate
- connection means
- alarm bell
- 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.)
- Withdrawn
Links
- 230000000295 complement effect Effects 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000005755 formation reaction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000009429 electrical wiring Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K1/00—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs
- G10K1/06—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube
- G10K1/062—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube electrically operated
- G10K1/063—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube electrically operated the sounding member being a bell
- G10K1/064—Operating or striking mechanisms therefor
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Burglar Alarm Systems (AREA)
Abstract
An electric alarm bell has a backing plate (10) with open- topped pockets (18) into which lugs (26) on an internal channel housing (12) connected to a gong (11) engage to secure the channel housing (12) to the backing plate (10). The internal channel housing (12) carries the bell striker mechanism (13) and a three-contact (25) electrical connection means which engages with a three-contact (17) electrical connection means on the backing plate (10). <IMAGE>
Description
SPECIFICATION
Electric alarm bells
This invention relates to electric alarm bells for use as an audible signal or as part of a fire alarm or security system.
According to a first aspect of the present invention there is provided an electric alarm bell comprising a gong mounting an electrically-operable striker mechanism having first electrical connection means with at least three contacts adapted to make circuit with a second electrical connection means also having at least three contacts and which is connectable to an electricity supply.
Preferably the second electrical connection means is carried by a mounting portion for supporting the gong and which is attachable to a wall or other support, the arrangement being such that when the gong is fitted on to the mounting portion the electrical connection means interengage with one another. The electrical connection means may interengage by pin and socket contacts.
According to a second aspect of the invention, there is provided an electrical alarm bell comprising a mounting plate attachable to a wall or other support, a gong housing a striker mechanism, and means for releasably connecting the gong and striker mechanism to the mounting plate, the connecting means comprising complementary slidably interengaging formations on the gong and the mounting plate.
Preferably the mounting plate has at least two laterally-spaced, open-topped pockets into which can be slidably engaged complementary lugs carried by the gong.
Preferably, the gong has an internal channel housing within which first electrical connection means and the striker mechanism are supported, the channel housing mounting the lugs which are engageable in the open-topped pockets formed in the mounting plate.
An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is an exploded perspective view of an electric alarm bell according to the present invention;
Figure 2 is a perspective view of the contact arrangement of the alarm bell; and
Figures 3 and 4 are perspective views from opposite sides of the internal channel housing of the gong.
The alarm bell comprises a mounting plate 10 and a gong 11 within which is mounted a channel housing 1 2 containing the bell striker mechanism 1 3 and one part 14 of the bell electrical connection, the other and complementary part 1 5 of which is carried by the plate 10.
The mounting plate 10 is provided with a series of screw holes 1 6 to allow for its securement at different locations. It mounts, as aforesaid, the electrical connection part 1 5 having three contacts 1 7 of the socket type.
The plate 10 is stamped out to form four tapered pockets 1 8 open at the top and to one side.
One of the bottom pockets 1 8 has formed adjacent thereto a flange 1 9 in which is supported a capture screw 20.
In use, the mounting plate 10 is usually screwed onto a wall, the electrical wiring (not shown) of the alarm system passing through a hole 21 in the mounting plate 10 and being screwed to electrical contacts 1 7.
The gong 11 has the internal channel housing 12 secured therein by a central screw 22.
Within the channel housing 1 2 is mounted the striker mechanism 1 3 whereof the solenoid coil 23 is electrically connected as indicated at 24 to the electrical connection part 14 having three contacts 25 of the pin type.
The internal channel housing 1 2 has four lateral lugs 26 each for releasable engagement in one of the pockets 1 8 of the mounting plate 1 0. The lug 26 corresponding to the pocket 1 8 adjacent the flange 1 9 has a corresponding flange 27 with a tapped hole 28 to receive the screw 20.
To fit the gong 11 on its mounting plate 10 it is only necessary to locate it with the lugs 26 above the pockets 1 8 and then slide it downwards to engage the lugs 26 in the pockets 18.
This action also interengages the pin contacts 25 into the socket contacts 1 7 so that the striker mechanism is now in circuit.
The capture screw 20 is now screwed into the tapped hole 28 in the flange 27 on the channel housing 1 2 of the gong 11 releasably to retain the gong 11 on its plate 1 0.
The coil 23 of the alarm bell has, as a result of the electrical connection 14, 1 5 selective voltage tapping, say six, twelve and twenty four voltage tappings thus permitting different sound characteristics to be achieved.
The coil 23 is also formed with cut outs to accommodate printed circuitry.
The gong 11 is eccentrically mounted with respect to internal channel housing 1 2 so that it can be turned to vary its position relative to the striker mechanism 1 3 to vary the sound characteristics of the bell.
The gong 11 and its associated components can be secured directly, say to a wall or box (mounting plate 10 omitted) through the intermediary of the internal channel housing 1 2 which is provided with tapped holes 29 in side lugs 30 for this purpose. In this case the electrical wiring of the supply would have the electrical connection part 1 5 secured directly thereto for engagement with the gong connection part 1 4 and the channel housing 1 2 would be mounted first and the gong 11 secured thereto thereafter.
Claims (10)
1. An electric alarm bell comprising a gong mounting an electrically-operable striker mechanism having first electrical connection means with at least three contacts adapted to make circuit with a second electrical connection means also having at least three contacts and which is connectable to an electricity supply.
2. An electric alarm bell as claimed in claim 1 in which the second electrical connection means is carried by a mounting portion for supporting the gong and which is attachable to a wall or other support, the arrangement being such that when the gong is fitted on to the mounting portion the electrical connection means interengage with one another.
3. An electric alarm bell as claimed in claim 1 or 2 in which the first and second electrical connection means are pin and socket contacts.
4. An electric alarm bell comprising a mounting plate attachable to a wall or other support, a gong housing a striker mechanism, and means for releasably connecting the gong and striker mechanism to the mounting plate, the connecting means comprising complementary slidably interengaging formations on the gong and the mounting plate.
5. An electric alarm bell as claimed in claim 4, in which the mounting plate has at least two laterally-spaced, open-topped pockets into which can be slidably engaged complementary lugs carried by the gong.
6. An electric alarm bell as claimed in claim 5 in which the gong has an internal channel housing within which first electrical connection means and the striker mechanism are supported, the channel housing mounting the lugs which are engageable in the opentopped pockets formed in the mounting plate.
7. An electric alarm bell as claimed in claim 6, in which the mounting plate carries a capture screw engaging in a flange on the internal channel housing to secure the gong to the mounting plate.
8. An electric alarm bell as claimed in claim 6 or 7, in which second electrical connection means are carried by the mounting plate, the first and second electrical connection means interengaging simultaneously with the interengagement of the complementary formations on the gong and mounting plate.
9. An electrical alarm bell as claimed in claim 8, in which each electrical connection means comprises at least three contacts.
10. An electrical alarm bell, substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8009212A GB2049254A (en) | 1979-03-24 | 1980-03-19 | Electric alarm bells |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7910434 | 1979-03-24 | ||
| GB8009212A GB2049254A (en) | 1979-03-24 | 1980-03-19 | Electric alarm bells |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2049254A true GB2049254A (en) | 1980-12-17 |
Family
ID=26271017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8009212A Withdrawn GB2049254A (en) | 1979-03-24 | 1980-03-19 | Electric alarm bells |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2049254A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021135406A (en) * | 2020-02-27 | 2021-09-13 | 能美防災株式会社 | Alarm bell |
-
1980
- 1980-03-19 GB GB8009212A patent/GB2049254A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021135406A (en) * | 2020-02-27 | 2021-09-13 | 能美防災株式会社 | Alarm bell |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |