GB2033640A - Bell volume control - Google Patents

Bell volume control Download PDF

Info

Publication number
GB2033640A
GB2033640A GB7843001A GB7843001A GB2033640A GB 2033640 A GB2033640 A GB 2033640A GB 7843001 A GB7843001 A GB 7843001A GB 7843001 A GB7843001 A GB 7843001A GB 2033640 A GB2033640 A GB 2033640A
Authority
GB
United Kingdom
Prior art keywords
bell
clapper
ribbon
secured
clapper rod
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
Application number
GB7843001A
Other versions
GB2033640B (en
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.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
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.)
Filing date
Publication date
Application filed by Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB7843001A priority Critical patent/GB2033640B/en
Publication of GB2033640A publication Critical patent/GB2033640A/en
Application granted granted Critical
Publication of GB2033640B publication Critical patent/GB2033640B/en
Expired legal-status Critical Current

Links

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
    • G10K1/0645—Operating or striking mechanisms therefor provided with loudness adjustment

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The movement of the clapper 19 in an electromechanical bell can be restricted in order to vary the volume of the sound of the bell. The restriction takes the form of a plastics ribbon 32 or cord, which is looped around the capper rod 18. By tightening the loop of ribbon or cord the movement of the capper rod is reduced and hence the bell volume is reduced. The movement of the clapper is also absorbed by the loop and thus no rattle is transferred to the case of the bell assembly. <IMAGE>

Description

SPECIFICATION Improvements in or relating to bell assemblies This invention relates to bell assemblies and more particularly to means for varying the volume of sound emanating from a bell.
Various methods of achieving this have been attempted, one well known method being to restrict the movement of the clapper rod. A problem normally encountered with this method is that the vibration of the clapper rod is transferred via the restricting device to the clapper rod mountings causing additional noises or rattles.
It is an object of the present invention therefore to provide a bell assembly in which the volume of sound emanating from the bell can be varied without transferring extra noises to the clapper rod mountings.
According to the present invention a bell assembly comprises a bell, a clapper, a clapper rod and resilient means secured to a fixed portion of the bell assembly, the resilient means being adapted to restrict the amplitude of vibration of the clapper rod and being adjustable, whereby the amplitude of vibration of the clapper rod is varied as the resilient means is adjusted.
The resilient means preferably comprises an elongate piece of flexible material looped around the clapper rod and secured at both ends.
Preferably one of the secured ends of the elongate piece is moveable relative to the other secured end whereby the size of the loop can be adjusted and the amplitude of the clapper rod can be varied.
The elongate strip may comprise a strip of plastic ribbon.
Preferably the strip of plastic ribbon is secured to the clapper rod mounting.
An embodiment of the invention will now be described by way of example only with reference to the accompanying drawing which is a plan view of the base of a typical subscriber's telephone unit having a bell assembly in accordance with the present invention.
On the base 10 are mounted two bells 12 and 14 and a coil 16. The coil is intended to cause movement of a clapper rod 18 in substantially the same plane as the base 10 in well known manner by alternatively energising electromagnetic pole pieces 20 and 22 to cause a pivoting movement of a plate assembly 24 to which the clapper rod 18 is attached.
A clapper 19 is secured to the end of the clapper rod 18.
The coil 16 is mounted on a bracket 26 which is turn is secured to the base 10 by screws 28 and 30.
Also firmly secured by the screw 28 is the end of a plastic ribbon 32, and pivoted on the screw 30 is an operating lever 34. The operating lever 34 is in the form of a bell crank having an extension 36, and the other end of the plastic ribbon 32 is secured to the extension 36 by a screw 38. The ribbon is looped around the clapper rod 18 between its two secured ends and is provided with a slot 40 whereby the length of the ribbon and hence the size of the loop can be varied during assembly.
It will be seen that movement of the operating lever 34 about the screw 30 will cause the loop in the ribbon 32 to vary in size; the loop being largest when the free end 42 of the operating lever is on the left side when viewed in the drawing and being smallest when the free end 42 is on the right side. A series of serrations 44 can be provided on the base 10 which are adapted to be engaged by a suitable raised portion formed on the lever 34 to retain the lever 34 in a preselected position.
When the end 42 of the lever 34 is in the left-hand position, the loop does not contact the clapper rod 18 when the bell assembly operates, and the volume of the bell is thus at its greatest. As the end 42 of the lever is moved to the right, the loop tightens and restricts the movement of the clapper rod 18, thus absorbing the momentum of the clapper 19 and reducing the volume of the bell. Since the ribbon 32 is resilient, the vibration of the clapper 19 is not transmitted to the ribbon mounting screws 28,38 and 30 and thus no extra noises such as rattles are transferred to the bracket 26 and the base 10.
Various means of adjusting the size of the loop in the ribbon 32 can be used instead of the lever 34, for example the end of the ribbon could be pulled directly towards the side of the base by a suitable mechanical arrangement. Also the ribbon 32 could be replaced by a plastic cord, or the ribbon could be provided with a variable sized hole which would surround the clapper rod 18.
The lever 34, and the ribbon 32 could be formed in a single piece, the lever portion being made thicker than the ribbon portion whereby the ribbon portion retains its resilience.
1. A bell assembly comprising a bell, a clapper, a clapper rod and resilient means secured to a fixed portion of the bell assembly, the resilient means being adapted to restrict the amplitude of vibration of the clapper rod and being adjustable, whereby the amplitude of vibration of the clapper rod is varied as the resilient means is adjusted.
2. A bell assembly as claimed in claim 1 in which the resilient means comprises an elongate piece of flexible material.
3. A bell assembly as claimed in claim 2 in which the elongate piece of flexible material is looped around the clapper rod and secured at both ends.
4. A bell assembly as claimed in claim 3 in which one of the secured ends of the elongate piece of flexible material is moveable relative to the other secured end whereby the size of the loop can be adjusted and the amplitude of vibration of the clapper rod can be varied.
5. A bell assembly as claimed in any of claims 2 to 4 in which the elongate strip of flexible material comprises a strip of plastic ribbon.
6. A bell assembly as claimed in claim 5 in which one end of the strip of plastic ribbon is secured to the clapper rod mounting and the other end is secured to the end of a first lever pivoted on the clapper rod mounting.
7. A bell assembly as claimed in claim 6 in which
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in or relating to bell assemblies This invention relates to bell assemblies and more particularly to means for varying the volume of sound emanating from a bell. Various methods of achieving this have been attempted, one well known method being to restrict the movement of the clapper rod. A problem normally encountered with this method is that the vibration of the clapper rod is transferred via the restricting device to the clapper rod mountings causing additional noises or rattles. It is an object of the present invention therefore to provide a bell assembly in which the volume of sound emanating from the bell can be varied without transferring extra noises to the clapper rod mountings. According to the present invention a bell assembly comprises a bell, a clapper, a clapper rod and resilient means secured to a fixed portion of the bell assembly, the resilient means being adapted to restrict the amplitude of vibration of the clapper rod and being adjustable, whereby the amplitude of vibration of the clapper rod is varied as the resilient means is adjusted. The resilient means preferably comprises an elongate piece of flexible material looped around the clapper rod and secured at both ends. Preferably one of the secured ends of the elongate piece is moveable relative to the other secured end whereby the size of the loop can be adjusted and the amplitude of the clapper rod can be varied. The elongate strip may comprise a strip of plastic ribbon. Preferably the strip of plastic ribbon is secured to the clapper rod mounting. An embodiment of the invention will now be described by way of example only with reference to the accompanying drawing which is a plan view of the base of a typical subscriber's telephone unit having a bell assembly in accordance with the present invention. On the base 10 are mounted two bells 12 and 14 and a coil 16. The coil is intended to cause movement of a clapper rod 18 in substantially the same plane as the base 10 in well known manner by alternatively energising electromagnetic pole pieces 20 and 22 to cause a pivoting movement of a plate assembly 24 to which the clapper rod 18 is attached. A clapper 19 is secured to the end of the clapper rod 18. The coil 16 is mounted on a bracket 26 which is turn is secured to the base 10 by screws 28 and 30. Also firmly secured by the screw 28 is the end of a plastic ribbon 32, and pivoted on the screw 30 is an operating lever 34. The operating lever 34 is in the form of a bell crank having an extension 36, and the other end of the plastic ribbon 32 is secured to the extension 36 by a screw 38. The ribbon is looped around the clapper rod 18 between its two secured ends and is provided with a slot 40 whereby the length of the ribbon and hence the size of the loop can be varied during assembly. It will be seen that movement of the operating lever 34 about the screw 30 will cause the loop in the ribbon 32 to vary in size; the loop being largest when the free end 42 of the operating lever is on the left side when viewed in the drawing and being smallest when the free end 42 is on the right side. A series of serrations 44 can be provided on the base 10 which are adapted to be engaged by a suitable raised portion formed on the lever 34 to retain the lever 34 in a preselected position. When the end 42 of the lever 34 is in the left-hand position, the loop does not contact the clapper rod 18 when the bell assembly operates, and the volume of the bell is thus at its greatest. As the end 42 of the lever is moved to the right, the loop tightens and restricts the movement of the clapper rod 18, thus absorbing the momentum of the clapper 19 and reducing the volume of the bell. Since the ribbon 32 is resilient, the vibration of the clapper 19 is not transmitted to the ribbon mounting screws 28,38 and 30 and thus no extra noises such as rattles are transferred to the bracket 26 and the base 10. Various means of adjusting the size of the loop in the ribbon 32 can be used instead of the lever 34, for example the end of the ribbon could be pulled directly towards the side of the base by a suitable mechanical arrangement. Also the ribbon 32 could be replaced by a plastic cord, or the ribbon could be provided with a variable sized hole which would surround the clapper rod 18. The lever 34, and the ribbon 32 could be formed in a single piece, the lever portion being made thicker than the ribbon portion whereby the ribbon portion retains its resilience. CLAIMS
1. A bell assembly comprising a bell, a clapper, a clapper rod and resilient means secured to a fixed portion of the bell assembly, the resilient means being adapted to restrict the amplitude of vibration of the clapper rod and being adjustable, whereby the amplitude of vibration of the clapper rod is varied as the resilient means is adjusted.
2. A bell assembly as claimed in claim 1 in which the resilient means comprises an elongate piece of flexible material.
3. A bell assembly as claimed in claim 2 in which the elongate piece of flexible material is looped around the clapper rod and secured at both ends.
4. A bell assembly as claimed in claim 3 in which one of the secured ends of the elongate piece of flexible material is moveable relative to the other secured end whereby the size of the loop can be adjusted and the amplitude of vibration of the clapper rod can be varied.
5. A bell assembly as claimed in any of claims 2 to 4 in which the elongate strip of flexible material comprises a strip of plastic ribbon.
6. A bell assembly as claimed in claim 5 in which one end of the strip of plastic ribbon is secured to the clapper rod mounting and the other end is secured to the end of a first lever pivoted on the clapper rod mounting.
7. A bell assembly as claimed in claim 6 in which a further level is connected to the first lever, the further lever being adjustable to move the first lever whereby the size of the loop is adjusted.
8. A bell assembly constructed and adapted to operate substantially as hereinbefore described with reference to the accompanying drawings.
GB7843001A 1978-11-02 1978-11-02 Bell volume control Expired GB2033640B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7843001A GB2033640B (en) 1978-11-02 1978-11-02 Bell volume control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7843001A GB2033640B (en) 1978-11-02 1978-11-02 Bell volume control

Publications (2)

Publication Number Publication Date
GB2033640A true GB2033640A (en) 1980-05-21
GB2033640B GB2033640B (en) 1982-12-22

Family

ID=10500766

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7843001A Expired GB2033640B (en) 1978-11-02 1978-11-02 Bell volume control

Country Status (1)

Country Link
GB (1) GB2033640B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6298591B1 (en) 1996-01-17 2001-10-09 Visual Graphic Systems Inc. Sign system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6298591B1 (en) 1996-01-17 2001-10-09 Visual Graphic Systems Inc. Sign system

Also Published As

Publication number Publication date
GB2033640B (en) 1982-12-22

Similar Documents

Publication Publication Date Title
KR920020001A (en) Sound and Vibration Damping Device
ATE89376T1 (en) RUBBER MOUNTING WITH HYDRAULIC DAMPING.
MX172724B (en) RUBBER SUPPORT WITH HYDRAULIC DAMPING
US3974469A (en) Permanent magnet biasing means for reed switches
GB2033640A (en) Bell volume control
GB2218776B (en) Control cable system for reducing vibration
US5081980A (en) Plunger arrow rest
ES2074242T3 (en) BRACKET FOR DOOR STOP DEVICE OF A FRONT TYPE AND DOOR STOP DEVICE COMPRISING SUCH BRACKET.
US6586664B1 (en) Drum muting system
GB2063545A (en) Improvements in or relating to bell assemblies
DK204589A (en) SPEAKER SYSTEM
US2966089A (en) Chimes
GB2073931A (en) Bell assembly
GB2080922A (en) Damped mounting assembly
US3487811A (en) Ringer volume control
JPH10110699A (en) Rubber vibration isolator for fan motor
US4037504A (en) Device in a piano mechanism
US3284797A (en) Two-tone door chime
US2800101A (en) Sound damper for signalling devices
US2026654A (en) Vibratory diaphragm horn mounting
JPH1078068A (en) Coil spring vibration noise preventing tube
US3182307A (en) Electrical signalling devices
US1998537A (en) Ringer apparatus
US3172100A (en) Ringer clapper assembly
GB2070433A (en) Vibrator

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee