CA1150988A - Motor actuated bell - Google Patents
Motor actuated bellInfo
- Publication number
- CA1150988A CA1150988A CA000368509A CA368509A CA1150988A CA 1150988 A CA1150988 A CA 1150988A CA 000368509 A CA000368509 A CA 000368509A CA 368509 A CA368509 A CA 368509A CA 1150988 A CA1150988 A CA 1150988A
- Authority
- CA
- Canada
- Prior art keywords
- lever
- hammer
- connecting plate
- bell
- base
- 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
- Percussion Or Vibration Massage (AREA)
Abstract
MOTOR ACTUATED BELL
Abstract of the Disclosure The present invention relates to a motor actuated bell. The motor actuated bell is comprised of a crank member operatively connected to a motor drive shaft. An elongated connecting plate is connected at one end thereof to the crank member for reciprocal movement along its axis. A pivotal lever is connected at one end thereof generally perpendicularly to the other end of said connecting plate for being subjected to a swinging movement. A hammer has a resilient unit resiliently supporting a hammer element on the lever.
Abstract of the Disclosure The present invention relates to a motor actuated bell. The motor actuated bell is comprised of a crank member operatively connected to a motor drive shaft. An elongated connecting plate is connected at one end thereof to the crank member for reciprocal movement along its axis. A pivotal lever is connected at one end thereof generally perpendicularly to the other end of said connecting plate for being subjected to a swinging movement. A hammer has a resilient unit resiliently supporting a hammer element on the lever.
Description
This invention relates generally to motor actuated bells and more particularly to motor actuated bells of the type in which a motor drives a hammer means through a transmission means to allow the hammer to strike against an associated gong with substantial impact, to thereby produce a bell sound of great volume.
One conventional prior art motor actuated bell uses an electric motor which rotates a cam via a gear train. The cam intermittently acts on one end of a hammer, against the action of a spring in order to drive the hammer against a gong in order to produce a bell sound. This prior art bell has the disadvantage that the motor must provide substantial torque in order to produce a bell sound of great volume.
SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide a motor actuated bell which is capable of producing a bell sound of substantial volume without the need for a great motor torque.
~o In accordance with an aspect of the invention there is provided a motor actuated bell which comprises: (a) a gong;
(b) a base mounted with said gong; (c) a motor mounted on said base and having a rotatable drive shaft; (d) a crank member operatively connected to said motor drive shaft;
(e) an elongated connecting plate connected at one end thereof to said crank member for reciprocal movement along its axis generally in parallel relation to said base; (f) a lever pivotally mounted on said base and connected at one end thereof generally perpendicularly to the other end of said connecting plate for swinging movement in parallel spaced relation to said base; and (g) a hammer means having a hammer element for striking against the inner wall of .. ..
said gong, said hammer means having a resilient means resiliently supporting said hammer element on said lever, and the axis of said hammer element being disposed perpendicularly to said lever.
BRIl~F DESCRIPTION OF THE DRAWINGS
In drawings which illustrate embodiments of the invention:
FIG. 1 is a schematic perspective view of a motor actuated bell constructed in accordance with the prior art;
FIG. 2 is a cross-sectional view of a motor actuated bell in accordance with the present invention;
FIG. 3 is a partial schematic plan view of the bell;
and FIGS. 4 to 6 are partial schematic views sllowing modified bells.
One conventional motor actuated bell, is shown in FIG.
1. The bell is comprised of a small DC motor 100 having a drive shaft 101 on which a gcar 102 is Eixcdly mounted.
wheel gear 103 fixedly mounted on a shaEt lO4 and engages 20 the gear 102. A cam l05 is moullted on thc sha~t LO~.
With this construction, thc motor 100 is driv~n to rotate the cam ]05 through the mesllcd gcclrs 102, 103 so that the cam intermittcntly acts on the encl of a hammer LOG. The hammer strikes against arl associated ~Jong, against t:hc bias of a coil spring 107, to procluce a bell sound. I'his known motor driven bell has beel1 ~ound not entirely satisfactory in that the motor must provide a substantial ; torque to enable the hammer to strike against the gong with substantial impact to produce a bell sound of great volume.
FIGS. 2 and 3 show a motor actuated bell 10. An electric motor 11 is fixedly mounted on a mounting plate or base 12 by screws 13. The motor has a drive shaft 14
One conventional prior art motor actuated bell uses an electric motor which rotates a cam via a gear train. The cam intermittently acts on one end of a hammer, against the action of a spring in order to drive the hammer against a gong in order to produce a bell sound. This prior art bell has the disadvantage that the motor must provide substantial torque in order to produce a bell sound of great volume.
SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide a motor actuated bell which is capable of producing a bell sound of substantial volume without the need for a great motor torque.
~o In accordance with an aspect of the invention there is provided a motor actuated bell which comprises: (a) a gong;
(b) a base mounted with said gong; (c) a motor mounted on said base and having a rotatable drive shaft; (d) a crank member operatively connected to said motor drive shaft;
(e) an elongated connecting plate connected at one end thereof to said crank member for reciprocal movement along its axis generally in parallel relation to said base; (f) a lever pivotally mounted on said base and connected at one end thereof generally perpendicularly to the other end of said connecting plate for swinging movement in parallel spaced relation to said base; and (g) a hammer means having a hammer element for striking against the inner wall of .. ..
said gong, said hammer means having a resilient means resiliently supporting said hammer element on said lever, and the axis of said hammer element being disposed perpendicularly to said lever.
BRIl~F DESCRIPTION OF THE DRAWINGS
In drawings which illustrate embodiments of the invention:
FIG. 1 is a schematic perspective view of a motor actuated bell constructed in accordance with the prior art;
FIG. 2 is a cross-sectional view of a motor actuated bell in accordance with the present invention;
FIG. 3 is a partial schematic plan view of the bell;
and FIGS. 4 to 6 are partial schematic views sllowing modified bells.
One conventional motor actuated bell, is shown in FIG.
1. The bell is comprised of a small DC motor 100 having a drive shaft 101 on which a gcar 102 is Eixcdly mounted.
wheel gear 103 fixedly mounted on a shaEt lO4 and engages 20 the gear 102. A cam l05 is moullted on thc sha~t LO~.
With this construction, thc motor 100 is driv~n to rotate the cam ]05 through the mesllcd gcclrs 102, 103 so that the cam intermittcntly acts on the encl of a hammer LOG. The hammer strikes against arl associated ~Jong, against t:hc bias of a coil spring 107, to procluce a bell sound. I'his known motor driven bell has beel1 ~ound not entirely satisfactory in that the motor must provide a substantial ; torque to enable the hammer to strike against the gong with substantial impact to produce a bell sound of great volume.
FIGS. 2 and 3 show a motor actuated bell 10. An electric motor 11 is fixedly mounted on a mounting plate or base 12 by screws 13. The motor has a drive shaft 14
- 2 -t88 extending from the motor body in parallel spaced relationship to the mounting plate 12. A crank member 15 is fixedly mounted on the motor drive shaft 14 for rotation therewith. The crank member has a cylindrical body 15a and an eccentric pin 16 formed integral with the body. The eccentric pin 16 is disposed in eccentric or offset relation to the axis of the drive shaft 14. An elongated connecting plate 17 of a rectangular shape has a slot 18 formed therethrough at one end thereof. The slot lO extends across the width of the plate, i.e., perpendicularly to its longitudinal axis. The connecting plate 17 is disposed in parallel spaced relation to the mounting plate 12. The eccentric pin 16 is loosely received in the slot 18, the pin having an enlarged head 16a for preventing the connecting plate 17 from becoming disengaged therefrom. A rigid level 19, which is made, for example, o~ a rigid synthetic resin, is pivotally mounted intermediate opposite ends thereof on a post 20 which extends perpendicularly from the mountiny plate l2.
20 The lever 19 is disposed in parallel spaced relatioll!;hip to the mounting plate 12. Tlle lcver 19 is rigidly connected at one encl thereo~ to the end o~ the connectir pl~te 17 remote ~rom the eccelltric pin ]6, the lever l9 extendinc3 througll tl-e conllecting plate and intersectin~3 the same substantially perpendicularly.
A hammer means 21 comprises a leaf spring 21a secured at one end thereof by rivets 21b to the end of the lever 19 remote from the connecting plate 17, and a hammer r element 21c secured to the other end of the leaf spriny 30 21a.
As shown in FIG. 3, the length of the eccentric pin 16 between the inner face of the head 16a and the end Eace 15b of the cylindrical crank body 15a is greater than the thickness of the connecting plate 17 to permit a slight lateral movement of the plate 17.
As shown in FIG. 2, the mounting plate 12 is arranged within and connected to an inverted cup-shaped gong or bell 22 by a connecting member 23 of a generally channel-shaped cross-section. The connecting member 23 is fixedly secured to the mounting plate 12 and the gong 22 by screws 24.
In operation, the motor ll is driven through a power source (not shown) to rotate the crank member lS in a clockwise direction (FIG. 2) to allow the eccentric pin 16 to revolve around the drive shaft ],4. During a ~irst half of the revolutlon of the pin 16, the pin, which is disposed Oll the left side of the drive sha~t 1~ (FIG. 2) ; with its axis and the axis of thc drive shaft 14 lyinc3 in a common plane parallel to the mountillg plate 12, is angularly moved through ]~0 so tl-at the pin 16 is held in sliding contact with the right s,id(! cdge o~ thc? slot 18 to move the connectin~ plate l7 in a right-hancl clircction.
The connecting plate 17 thercby cau5cs the levc,~r l9 to pivot about the post 20 so that thc hammcr element 21c strikes against the inner wall of the gong 22 to produce a bell sound. During the other half of the revolutioll of the eccentric pin 16, the pin is angularly moved through 180 so that the pin 16 is held in sliding contact with the left side edge of the slot 18. This moves the connecting plate 17 in a left-hand direction~ The connecting plate 17 thereby causes the lever l9 to pivot about the post 20 so that the hammer element 21c is moved away from the gong 22.
This cycle of operation is continuously repeated to impart a swinging motion to the hammer means 21 so as to produce a bell sound of the required volume. When the hammer means 21 is moved to its fully retracted position from the gong 22, the leaf spring 21a is slightly flexed in a direction away from the gong so that the restoring force of the flexed leaf spring 21a enhances the striking of the hammer element 21c against the gong 22.
According to a modified form of the invention shown in FIG. 4, a rigid lever 30 is pivotally mounted on the post 20 at approximately its center. The lever 30 has a hammer means 31 secured to its free end remote from the connecting plate 17. The hammer means comprises a hammer element 31a and a resilient means 31b in the form of a coil spring interconnecting the hammer elemellt 31a and the lever 30. The operation oE this mo(liEied bell is substantially similar to that o~ the bell 10 shown in ; FIGS. 2 and 3. When the hammer mecllls 31 is movcd to its fully retracted position from the goncJ 22, the coil spring 31b is axially contracted so tilat: the restoriny ~orce of the thus contracted coil spring 31b encllances the striking of the hammer element 31a against the gong 22, depcnding on the spring constant of the coil spring 31b ancl the speed of rotation of the motor drive shaft 14.
FIG. 5 shows another modification in which a rigid lever 35 is pivotally mounted on a post 20a at one end thereof remote from the connecting plate 17. The lever 35 has a hammer means 36 mounted thereon intermediate its opposite ends. ~he hammer means 36 comprises an elongated hammer element 36a of a cylindrical shape having a head
20 The lever 19 is disposed in parallel spaced relatioll!;hip to the mounting plate 12. Tlle lcver 19 is rigidly connected at one encl thereo~ to the end o~ the connectir pl~te 17 remote ~rom the eccelltric pin ]6, the lever l9 extendinc3 througll tl-e conllecting plate and intersectin~3 the same substantially perpendicularly.
A hammer means 21 comprises a leaf spring 21a secured at one end thereof by rivets 21b to the end of the lever 19 remote from the connecting plate 17, and a hammer r element 21c secured to the other end of the leaf spriny 30 21a.
As shown in FIG. 3, the length of the eccentric pin 16 between the inner face of the head 16a and the end Eace 15b of the cylindrical crank body 15a is greater than the thickness of the connecting plate 17 to permit a slight lateral movement of the plate 17.
As shown in FIG. 2, the mounting plate 12 is arranged within and connected to an inverted cup-shaped gong or bell 22 by a connecting member 23 of a generally channel-shaped cross-section. The connecting member 23 is fixedly secured to the mounting plate 12 and the gong 22 by screws 24.
In operation, the motor ll is driven through a power source (not shown) to rotate the crank member lS in a clockwise direction (FIG. 2) to allow the eccentric pin 16 to revolve around the drive shaft ],4. During a ~irst half of the revolutlon of the pin 16, the pin, which is disposed Oll the left side of the drive sha~t 1~ (FIG. 2) ; with its axis and the axis of thc drive shaft 14 lyinc3 in a common plane parallel to the mountillg plate 12, is angularly moved through ]~0 so tl-at the pin 16 is held in sliding contact with the right s,id(! cdge o~ thc? slot 18 to move the connectin~ plate l7 in a right-hancl clircction.
The connecting plate 17 thercby cau5cs the levc,~r l9 to pivot about the post 20 so that thc hammcr element 21c strikes against the inner wall of the gong 22 to produce a bell sound. During the other half of the revolutioll of the eccentric pin 16, the pin is angularly moved through 180 so that the pin 16 is held in sliding contact with the left side edge of the slot 18. This moves the connecting plate 17 in a left-hand direction~ The connecting plate 17 thereby causes the lever l9 to pivot about the post 20 so that the hammer element 21c is moved away from the gong 22.
This cycle of operation is continuously repeated to impart a swinging motion to the hammer means 21 so as to produce a bell sound of the required volume. When the hammer means 21 is moved to its fully retracted position from the gong 22, the leaf spring 21a is slightly flexed in a direction away from the gong so that the restoring force of the flexed leaf spring 21a enhances the striking of the hammer element 21c against the gong 22.
According to a modified form of the invention shown in FIG. 4, a rigid lever 30 is pivotally mounted on the post 20 at approximately its center. The lever 30 has a hammer means 31 secured to its free end remote from the connecting plate 17. The hammer means comprises a hammer element 31a and a resilient means 31b in the form of a coil spring interconnecting the hammer elemellt 31a and the lever 30. The operation oE this mo(liEied bell is substantially similar to that o~ the bell 10 shown in ; FIGS. 2 and 3. When the hammer mecllls 31 is movcd to its fully retracted position from the goncJ 22, the coil spring 31b is axially contracted so tilat: the restoriny ~orce of the thus contracted coil spring 31b encllances the striking of the hammer element 31a against the gong 22, depcnding on the spring constant of the coil spring 31b ancl the speed of rotation of the motor drive shaft 14.
FIG. 5 shows another modification in which a rigid lever 35 is pivotally mounted on a post 20a at one end thereof remote from the connecting plate 17. The lever 35 has a hammer means 36 mounted thereon intermediate its opposite ends. ~he hammer means 36 comprises an elongated hammer element 36a of a cylindrical shape having a head
3~
36b. Hammer element 36a is slidably received in a hole ~not shown) formed thLough the lever 35. A pair of coil springs 36c, 36d are wound around the hammer element 36a on opposite sides of the lever 35. A collar 36e is fixedly mounted on the end of the hammer element 36a remote from the hammer head 36b. The coil spring 36c acts between the hammer head 36b and the lever 35 while the coil spring 36d acts between the collar 36e and the lever 35.
When the motor 11 is driven, the lever 35 is pivotally moved about the post 20a toward and away from the gong 22 by the crank member 15 and the connecting plate 17 so that the hammer head 36b strikes against the gong 22 to produce a bell sound. When the hammer el.ement 36a is moved to its fully retracted position from the gong 22, the coil. s~ring 36c is axially contracted so that the rt-~storing ~rce of the contracted coil spring 36c enhclnces the striking oÇ
the hammer head 36b aga:inst the gong 22 dcpt!ntlin~ on the spring constant of tht-~ coil spring 36c and the spet;~d of rotation o~ the motor drive sllaft :L4.
~ ccording to a Çurther modiÇication of tht? invention shown in FIG. 6, a rigid lever 40 oÇ a c~erleral.:ly el.ot-gated oval shape has a pair of spaced arms 40a, 40b and a pair of ring porti.ons 40c, 40d at its opposite ends. A
connecting plate 17a has an integral pin 17b at one end thereof remote from the crank member 15. The pin 17b and an upstanding post 20b are received in the ring portions 40c, 40d, respectively, so as to provide a pivotal connection. A hammer means 41, whic.h is identical in construction to the hammer means 36 shown in FIG. 5, is mounted on the lever 40 intermediate opposite ends thereof. A hammer element 41a extends through the arms 40a, 40b for sliding movement along its axis. A coil spring 41c acts between a hammer head 41b and the arm 40a while a coil spring 41d acts between the arm 40b and a collar 41e.
As described above, the resilient means in the form of a leaf spring or coil springs associated with the hammer element aids in imparting sufficient momentum to the hammer element to allow the hammer to strike against the gong with substantial impact so that a bcll sound of great volume is produced.
While the motor actuated bells according to this invention have been specifically shown and described herein, the invention itself is not to be restricted by the description. For example, a speed reducer may be connected to the motor drive shaft to actuate thc hammer at a lower speed.
' `
36b. Hammer element 36a is slidably received in a hole ~not shown) formed thLough the lever 35. A pair of coil springs 36c, 36d are wound around the hammer element 36a on opposite sides of the lever 35. A collar 36e is fixedly mounted on the end of the hammer element 36a remote from the hammer head 36b. The coil spring 36c acts between the hammer head 36b and the lever 35 while the coil spring 36d acts between the collar 36e and the lever 35.
When the motor 11 is driven, the lever 35 is pivotally moved about the post 20a toward and away from the gong 22 by the crank member 15 and the connecting plate 17 so that the hammer head 36b strikes against the gong 22 to produce a bell sound. When the hammer el.ement 36a is moved to its fully retracted position from the gong 22, the coil. s~ring 36c is axially contracted so that the rt-~storing ~rce of the contracted coil spring 36c enhclnces the striking oÇ
the hammer head 36b aga:inst the gong 22 dcpt!ntlin~ on the spring constant of tht-~ coil spring 36c and the spet;~d of rotation o~ the motor drive sllaft :L4.
~ ccording to a Çurther modiÇication of tht? invention shown in FIG. 6, a rigid lever 40 oÇ a c~erleral.:ly el.ot-gated oval shape has a pair of spaced arms 40a, 40b and a pair of ring porti.ons 40c, 40d at its opposite ends. A
connecting plate 17a has an integral pin 17b at one end thereof remote from the crank member 15. The pin 17b and an upstanding post 20b are received in the ring portions 40c, 40d, respectively, so as to provide a pivotal connection. A hammer means 41, whic.h is identical in construction to the hammer means 36 shown in FIG. 5, is mounted on the lever 40 intermediate opposite ends thereof. A hammer element 41a extends through the arms 40a, 40b for sliding movement along its axis. A coil spring 41c acts between a hammer head 41b and the arm 40a while a coil spring 41d acts between the arm 40b and a collar 41e.
As described above, the resilient means in the form of a leaf spring or coil springs associated with the hammer element aids in imparting sufficient momentum to the hammer element to allow the hammer to strike against the gong with substantial impact so that a bcll sound of great volume is produced.
While the motor actuated bells according to this invention have been specifically shown and described herein, the invention itself is not to be restricted by the description. For example, a speed reducer may be connected to the motor drive shaft to actuate thc hammer at a lower speed.
' `
Claims (9)
1. a motor actuated bell which comprises:
(a) a gong;
(b) a base mounted with said gong;
(c) a motor mounted on said base and having a rotatable drive shaft;
(d) a crank member operatively connected to said motor drive shaft;
(e) an elongated connecting plate connected at one end thereof to said crank member for reciprocal movement along its axis generally in parallel relation to said base;
(f) a lever pivotally mounted on said base and connected at one end thereof generally perpendicularly to the other end of said connecting plate for swinging movement in parallel spaced relation to said base; and (g) a hammer means having a hammer element for striking against the inner wall of said gong, said hammer means having a resilient means resiliently supporting said hammer element on said lever, and the axis of said hammer element being disposed perpendicularly to said lever.
(a) a gong;
(b) a base mounted with said gong;
(c) a motor mounted on said base and having a rotatable drive shaft;
(d) a crank member operatively connected to said motor drive shaft;
(e) an elongated connecting plate connected at one end thereof to said crank member for reciprocal movement along its axis generally in parallel relation to said base;
(f) a lever pivotally mounted on said base and connected at one end thereof generally perpendicularly to the other end of said connecting plate for swinging movement in parallel spaced relation to said base; and (g) a hammer means having a hammer element for striking against the inner wall of said gong, said hammer means having a resilient means resiliently supporting said hammer element on said lever, and the axis of said hammer element being disposed perpendicularly to said lever.
2. A bell according to claim 1, in which said crank member has an eccentric pin disposed in eccentric relation to the axis of said rotatable drive shaft, said connecting plate lying in a plane generally perpendicular to the axis of said eccentric pin, said connecting plate having a slot formed therethrough at the one end thereof and extending in a direction of the width thereof, said eccentric pin being received in said slot whereby said connecting plate is reciprocally moved along its axis through said eccentric pin upon rotation of said motor drive shaft.
3. A bell according to claim 1, in which said lever is pivotally mounted on said base intermediate opposite ends thereof, said hammer means being mounted on the other end of said lever.
4. A bell according to claim 3, in which said resilient means is a leaf spring having opposite ends secured to the other end of said lever and said hammer element, respectively.
5. A bell according to claim 3, in which said resilient means is a coil spring extending between the other end of said lever and said hammer element.
6. A bell according to claim 1, in which said lever is pivotally mounted on said base at the other end thereof, said lever having said hammer mounted thereon intermediate opposite ends thereof.
7. A bell according to claim 1, in which said hammer element has an elongated body and extends through said lever for sliding movement along its axis, said resilient means comprising a pair of coil springs wound around said elongated body at the opposite sides of said lever, respectively.
8. A bell. according to claim 7, in which said lever is of a generally elongated oval shape having a pair of spaced arms.
9. A bell according to claim 1, in which said lever is pivotally connected at the one end to the other end of said connecting plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000368509A CA1150988A (en) | 1981-01-14 | 1981-01-14 | Motor actuated bell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000368509A CA1150988A (en) | 1981-01-14 | 1981-01-14 | Motor actuated bell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1150988A true CA1150988A (en) | 1983-08-02 |
Family
ID=4118921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000368509A Expired CA1150988A (en) | 1981-01-14 | 1981-01-14 | Motor actuated bell |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1150988A (en) |
-
1981
- 1981-01-14 CA CA000368509A patent/CA1150988A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |