CA1152783A - Motor actuated bell - Google Patents
Motor actuated bellInfo
- Publication number
- CA1152783A CA1152783A CA000368925A CA368925A CA1152783A CA 1152783 A CA1152783 A CA 1152783A CA 000368925 A CA000368925 A CA 000368925A CA 368925 A CA368925 A CA 368925A CA 1152783 A CA1152783 A CA 1152783A
- Authority
- CA
- Canada
- Prior art keywords
- gong
- cam member
- bell
- leaf spring
- 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
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
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Transmission Devices (AREA)
- Toys (AREA)
- Electromechanical Clocks (AREA)
- Percussion Or Vibration Massage (AREA)
Abstract
Abstract of the Disclosure The present invention relates to a motor actuated bell. The motor actuated bell comprises a cam member operatively connected to a motor drive shaft. The cam member acts on a hammer for moving the hammer generally in a parallel relation to the axis of rotation of the cam member to thereby allow the hammer to strike against an associated gong.
Description
~15~783 , Field of the Invention This invention relates to motor actuated bells of the type in which a motor drives a hammer means through a cam means to allow the hammer means to strike against an associated gong to produce a bell sound.
One conventional prior art motor actuated bell uses an electric motor which rotates a cam via a gear train. The cam is mounted on a shaft which is aligned perpendicular to both the axis of the motor shaft and a generally cylindrical hammer. The cam intermi~tently acts on the hammer to drive it against a gong in order to produce a bell sound. This prior art bell mechanism is not totally reliable because of side forces which act on bearings holding the cam shaft in place.
It is therefore an object of this invention to provide a motor actuated bell of the type which is capable of functioning properly for a prolonged period of time.
In accordance with an aspect of the invention there is provided a motor actuated bell which comprises (a) a base;
(b) a gong mounted on said base; (c) a motor mounted on said base within said gong and having a rotatable drive shaft extending in parallel relation to said base; (d) a hammer means comprising (i) a hammer element for striking against the inner wall of said gong and (ii) a leaf spring fi~edly secured at one end thereof to said base and extending in parallel spaced relation thereto, said leaf spring carrying said hammer element at the other end thereof; and (e) a circular cam member operatively and fixedly connected to said motor drive shaft for rotation therewith about the axis of said shaft, said cam member having a cam surface for acting directly on said leaf ~ q, ~15;~7~3~
spring for moving said hammer element toward and away from the inner wall of said gong, and said leaf spring being disposed perpendicular to the axis of said cam member.
In drawings which illustrate embodiments of the invention:
FIG. 1 is a cross-sectional view of a motor actuated bell provided in accordance with the present invention;
- la -,.
~15;~7~33 FIG. 2 is a partial schematic plan view of the bell;
FIG. 3 is a cross-sectional partial view of the bell taken along the line III - III of FIG. 2;
FIG. 4 is a perspective view of a cam member used in the bell;
FIGS. 5 to 15 are partial schematic plan views of modified bells accordins to the present invention;
FIG. 16 is a cross-sectional partial view taken along the line XVI - XVI of FIG. 15;
FIGS. 17 to 19 are partial schematic plan views of further modified bells according to the present invention;
and FIG. 20 is a schematic perspective view of a motor actuated bell constructed in accordance with the prior art.
DESCRIPTION QF THE PREFERRED EMBODIMENTS OF THE INVENTION
One conventional motor actuated bell shown in FIG. 20, is comprised of a small DC motor 100 having a drive shaft 101 on which a gear 102 is fixedly mounted. A wheel gear 103 is fixedly mounted on a shaft 104 and engages the gear 102. A cam 105 is mounted on the shaft 104. With this construction, the motor 100 rotates the cam 105 through the meshed gears 102, 103 so that the cam intermittently acts on the end of a hammer 106 so that the hammer strikes against an associated gong, against the bias of a coil spring 107, to produce a bell sound. This known motor driven bell has been found not entirely satisfactory in durability. This difficulty arises out of the fact that the axis of the shaft 104 which serves as the axis of rotation of the cam 105 is disposed perpendicular to the axis of the hammer 106 along which the hammer is moved.
As a result, the shaft 104 is subjected to substantial ~15~7~33 lateral forces when the cam 105 strikes the hammer 106 so that an associated bearing member (~ot shown) for the shaft 104 is subjected to considerable force, giving rise to damage of the bearing members. Where the cam 105 is directly mounted on the motor drive shaft 101 for engagement with the end of the hammer 106, the drive shaft 101 is subjected to substantial lateral forces. This prevents the motor 100 from functioning properly for a prolonged period of time.
FIGS. 1 and 2 show a motor actuated bell 10 in accordance with the present invention. An electric motor 11 is fixedly mounted on a mounting plate or base 12 by screws 13. The motor has a rotatable drive shaft 14 extending in a parallel relation to the mounting plate 12. A circular cam member 15 is fixedly mounted at its center on drive shaft 14 for rotation therewith about the axis thereof. The cam member 15 has a cam surface 15a on a surface facing the motor 11. The cam surface has a pair of diametrically-opposed raised portions 15b and a pair of recessed portions 15c disposed respectively adjacent to the raised portions (FIGS. 3 and 4).
A hammer means 16 comprises a leaf spring 16a of a rectangular shape fixedly secured at one end to a post 17 extending from the mounting plate 12, and a hammer element 16b secured ko the leaf spring 16a intermediate the opposite ends thereof. The leaf spring 16a extends in a parallel relation to the mounting plate 12 and is disposed perpendicular to the motor drive shaft 14. The leaf spring 16a has a pin 16c secured thereto at its end remote from the post 17. The pin extends perpendicularly from the leaf spring 16a toward the mounting plate 12 and being ~15~
held in sliding contact with the cam surface 15a (FIG. 2).
AS shown in FIG. 1, the mountin,,~ plate 12 is arranyed within and connected to an inverted cup-shaped gong or bell 18 by a connecting member 19 of a generally channel-shaped cross-section. The connecting member 19 is secured to the mounting plate 12 and the gong 18 by screws 20.
In operation, the motor 11 is driven through a power source (not shown) to rotate the cam member 15 in a clockwise direction (FIG. 3) so that each of the raised portions 15b of the cam surface 15a urges the leaf spring 16a and the hammer 16b away from the gong 18 via the pin 16c in sliding contact with the cam surface 15a. The pin 16c slides from the raised portion 15b into the adjacent recessed portion 15c whereupon the leaf spring 16a snaps back to allow the hammer element 16b to strike against the inner wall of the gong 18 to produce a bell sound. Thus, the gong 18 is struck twice by the hammer element 16b during one revolution of the cam member 15. During the operation of the bell 10, the hammer element 16b is moved generally in a parallel relation to the axis of rotation of the cam member 15.
FIG. 5 shows a modified bell lOa which differs from the bell 10 in that a cam surface 15a has only one raised portion 15b. With this construction, the gong 18 is struck once by thè hammer element 16b during one revolution of the cam member 15.
FIG. 6 shows another modiEied bell lOb which diEfers from the bell lOa shown in FIG. 5 only in that a modified hammer means 22 is provided. The hammer means 22 comprises a cylindrical hammer element 22a having a collar 22b fixedly mounted thereon. The hammer element 22a is i~SZ7~33 disposed in a parallel relation to the mounting plate 12 and the motor drive shaft 14. The hammer element 22a slidably extends through a pair of spaced stamped-out portions 12a of the mounting plate 12 for movement along its axis. A coil spring 22c is wound around the hammer element 22a and acts between the collar 22b and the stamped-out portion 12a. The collar 22b is held in sliding contact with the cam surface 15a of the cam member 15 by the coil spring 22c.
In operation, the motor 11 is driven to rotate the cam member 15 so that the raised portion 15b of the cam surface 15a urges the hammer element 22a away from the gong 18 against the bias of the coil spring 22c through the collar 22b in sliding contact with the cam surface 15a. The collar 22b slides from the raised portion 15b into the adjoining recessed portion 15c whereupon the hammer element 22a is moved toward the gong 18 under the action of the coil spring 22c to strike against the inner wall of the gong 18 to produce a bell sound. A plurality of raised portions 15b may be provided on the cam surface 15a.
FIG. 7 shows a further modified bell lOc which differs from the bell 10 shown in FIGS. 1 and 2 in that the cam member 15 is mounted on the drive shaft 14 with the cam surface 15a facing away from the motor 11.
In operation, the motor 11 is driven to rotate the cam member 15 so that each of the raised portions 15b urge the leaf spring 16a toward the gong 18 through the pin 16c in sliding contact with the cam surface 15a to allow the hammer element 16b to strike against the gong to produce a bell sound. Then, ~he pin 16c slides from the raised ~15;~:7133 portion 15b into the adjoining recessed portion 15c whereupon the leaf spring 16a snaps_ back to move the hammer element 16b away from the gong 18. The gong 18 is struck twice by the hammer element 16b during one revolution of the cam member 15.
FIG. 8 shows a still further modified bell lOd which differs from the bell lOc shown~in FIG. 7 in that a cam surface 15a has only one raised portion 15b. The gong 18 is struck once by the hammer element 16b during one revolution of the cam member 15.
FIG. 9 shows a further modified bell lOe which differs from the bell lOb shown in FIG. 6 in that the cam member 15 is mounted on the drive shaft 14 with the cam surface 15a facing away from the motor 11. A collar 22b is fixedly mounte~d on the end portion of the hammer element 22a remote from the gong 18, and the hammer element 22a slidably extends through the stamped-out portions 12a of the mounting plate 12 for movement along its axis. The raised portion 15b urges the hammer element 22a into striking engagement with the gong 18 through the collar 22b in sliding contact with the cam surface 15a to thereby produce a bell sound. ~ plurality of raised portions 15b may be provided on the cam surface 15a.
FIG. 10 shows a further modified bell lOf which differs from the bell 10 shown in FIGS. 1 and 2 in that a modified cam member 30 is provided. The cam member 30 of a circular shape is mounted at its center on the drive shaft 14 for rotation therewith about the axis thereof.
The cam member 30 has a cam surface 30a on the side facing the motor 11. The cam surface 30a is formed at the marginal portion of the cam member 30 and has a raised ~5~7~33 portion 30b of an arcuate contour and a flat portion 30c interrupted by the raised portion 3Db (FIG. 11). When the motor 11 is driven to rotate the cam member 30, the raised portlon 30b urges the leaf spring 16a away from the gong 18 through the pin 16c in sliding contact with the cam surface 30a, with the hammer element 16b moved from the gong 18. The pin 16c then slides from the raised portion 30b onto the flat portion 30c so that the hammer element 16b is urged into striking contact with the gong 18 under the action of the leaf spring 16a to thereby produce a bell sound.
FIG. 12 shows a further modified bell lOg which differs from the bell lOf shown in FIG. 10 in that there is provided a modified hammer means 22 which is identical in construction to the hammer means 22 shown in FIG. 6.
The raised portion 30b urges the hammer element 22a away from the gong 18 against the bias of the coil spring 22c through the collar 22b which is in sliding contact with the cam surface 30a. The collar 22b then slides from the raised portion 30b onto the flat portion 30c so that the hammer element 22a is urged into striking contact with the gong 18 under the action of the coil spring 22c to thereby prcduce a bell sound.
FIG. 13 shows a further modified bell lOh which differs from the bell lOf shown in FIG. 10 in that the cam member 30 is mounted on the drive shaft 14 with the cam surface 30a facing away from the motor 11. The raised portion 30b urges the leaf spring 16a toward the gong 18 via the pin 16c which is in sliding contact with the cam surface 30a to allow the hammer element 16b to strike against the gong 18 to produce a bell sound. The pin 16c ~:~S;~7~33 then slides from the raised portion 30b onto the flat portion 30c so that the hammer element 16b is moved away from the gong 18.
FIG. 14 shows a further modified bell lOi which differs from the bell lOg shown in FIG. 12 in that the cam member 30 is mounted on the drive shaft 14 with the cam surface 30a facing away from the motor 11. The collar 22b is fixedly mounted on the end portion of the hammer element 22a remote from the gong 18. The raised portion 30b urges the hammer element 22a into striking contact with the gong 18 via the collar 22b which is in sliding contact with the cam surface 30a to thereby produce a bell sound..
A plurality of raised portions 30b may be provided on the cam surface; 30a of the cam member 30 for the bells shown in FIGS. 10 to 14.
FIG. 15 shows a further modified bell lOj which differs from the bell lOh shown in FIG. 13 in that a modified cam member 33 is provided. As best shown in FIG.
16, the cam member 33 of a circular shape is mounted on ~ the drive shaft 14 at its center and has a cam surface 33a ,~ on the side facing away from the motor 11. The cam surface 33a is formed at the marginal portion of the cam member 33 and has a raised portion 33b. The leaf spring 16a has a projection 16e intermediate the hammer element 16b and the post 17, the projection 16e being engageable with the raised portion 33b. When the motor 11 is driven to rotate the cam member 33, the raised portion 33b is brought into engagement with the projection 16e to urge the leaf spring 16a toward the gong 18 so that the hammer element 16b is caused to strike against the gong 18 to :;
~15~2783 produce a bell sound. The raised portion 33b then becomes disengaged from the projection 16e to move the hammer element 16b away from the gong 18 under the bias of the leaf spring 16a.
FIG. 17 shows a further modified bell lOk which differs from the bell lOj shown in FIG. 15 in that the cam member 33 is mounted on the drive shaft 14 with the cam surface 33a facing the motor 11. The raised portion 33b is brought into engagement with the projection 16e to urge the leaf spring 16a and the hammer element 16b away from the gong 18. The raised portion 33b then becomes disengaged from the projection 16e so that the hammer element 16b is caused to strike against the gong 18 under the bias of the leaf spring 16a to produce a bell sound.
A plurality of raised portions 33b may be formed on the cam surface 33a of the cam member 33 for the bells shown in FIGS. 15 and 17.
FIG. 18 shows a further modified bell 101 which differs from the bell 10 shown in FIGS. 1 and 2 in that a modified cam member 35 is provided. The cam member 35 comprises a cylindrical body mounted at its center on the drive shaft 14 for rotation therewith about its axis. The cam body has a zigzag slot 35a formed in the cylindrical surface, The zigzag slot 35a has a pair of diametrically opposed apexes 35b and is asymmetry with respect to the axis of the cylindrical cam member 35. The pin 16c is received in the slot 35a for movement therealong. The pin is secured to the leaf spring 16a intermediate the hammer element 16b and the post 17. The motor 11 is driven to rotate the cam member 35 so that the pin 16c slides along the slot 35a to impart a swinging movement to the hammer 7~3~
element 16b through the leaf spring 16a. The hammer element 16b is moved generally in a parallel relation to the axis of rotation of the cam member 35. When the pin 16c slides into the apex 35b of the slot ~5, the hammer element 16b strikes against the gong 18 to produce a bell sound. It will be appreciated that the gong 18 is struck twice by the hammer element 16b during one revolution of the cam member 35.
FIG. 19 shows a further modified bell lOm which differs from the bell 101 shown in FIG. 18 in that a modified cylindrical cam member 35 is provided. A zigzag slot 35a formed in the cylindrical surface of the cam member 35 is symmetrical with respect to the axis of the cam member 35.
With the c~,nstruction of the above described motor actuated bells, the cam member acts on the hammer means via the pin 16c or the projection 16e in such a manner that the motor drive shaft, on which the cam member is mounted, axially supports the load applied by the hammer means. Therefore, the motor drive shaft is not substantially subjected to undue lateral forces and hence the motor is capable of functioning properly for a prolonged period of time.
A speed reducer may be connected between the motor drive shaft and the cam member to actuate the hammer means ~;' at a lower speed. In this case, a shaft supporting the cam member is arranged to axially support the load applied by the hammer means A Therefore, associated bearing members for this support shaft are not subjected to undue forces.
One conventional prior art motor actuated bell uses an electric motor which rotates a cam via a gear train. The cam is mounted on a shaft which is aligned perpendicular to both the axis of the motor shaft and a generally cylindrical hammer. The cam intermi~tently acts on the hammer to drive it against a gong in order to produce a bell sound. This prior art bell mechanism is not totally reliable because of side forces which act on bearings holding the cam shaft in place.
It is therefore an object of this invention to provide a motor actuated bell of the type which is capable of functioning properly for a prolonged period of time.
In accordance with an aspect of the invention there is provided a motor actuated bell which comprises (a) a base;
(b) a gong mounted on said base; (c) a motor mounted on said base within said gong and having a rotatable drive shaft extending in parallel relation to said base; (d) a hammer means comprising (i) a hammer element for striking against the inner wall of said gong and (ii) a leaf spring fi~edly secured at one end thereof to said base and extending in parallel spaced relation thereto, said leaf spring carrying said hammer element at the other end thereof; and (e) a circular cam member operatively and fixedly connected to said motor drive shaft for rotation therewith about the axis of said shaft, said cam member having a cam surface for acting directly on said leaf ~ q, ~15;~7~3~
spring for moving said hammer element toward and away from the inner wall of said gong, and said leaf spring being disposed perpendicular to the axis of said cam member.
In drawings which illustrate embodiments of the invention:
FIG. 1 is a cross-sectional view of a motor actuated bell provided in accordance with the present invention;
- la -,.
~15;~7~33 FIG. 2 is a partial schematic plan view of the bell;
FIG. 3 is a cross-sectional partial view of the bell taken along the line III - III of FIG. 2;
FIG. 4 is a perspective view of a cam member used in the bell;
FIGS. 5 to 15 are partial schematic plan views of modified bells accordins to the present invention;
FIG. 16 is a cross-sectional partial view taken along the line XVI - XVI of FIG. 15;
FIGS. 17 to 19 are partial schematic plan views of further modified bells according to the present invention;
and FIG. 20 is a schematic perspective view of a motor actuated bell constructed in accordance with the prior art.
DESCRIPTION QF THE PREFERRED EMBODIMENTS OF THE INVENTION
One conventional motor actuated bell shown in FIG. 20, is comprised of a small DC motor 100 having a drive shaft 101 on which a gear 102 is fixedly mounted. A wheel gear 103 is fixedly mounted on a shaft 104 and engages the gear 102. A cam 105 is mounted on the shaft 104. With this construction, the motor 100 rotates the cam 105 through the meshed gears 102, 103 so that the cam intermittently acts on the end of a hammer 106 so that the hammer strikes against an associated gong, against the bias of a coil spring 107, to produce a bell sound. This known motor driven bell has been found not entirely satisfactory in durability. This difficulty arises out of the fact that the axis of the shaft 104 which serves as the axis of rotation of the cam 105 is disposed perpendicular to the axis of the hammer 106 along which the hammer is moved.
As a result, the shaft 104 is subjected to substantial ~15~7~33 lateral forces when the cam 105 strikes the hammer 106 so that an associated bearing member (~ot shown) for the shaft 104 is subjected to considerable force, giving rise to damage of the bearing members. Where the cam 105 is directly mounted on the motor drive shaft 101 for engagement with the end of the hammer 106, the drive shaft 101 is subjected to substantial lateral forces. This prevents the motor 100 from functioning properly for a prolonged period of time.
FIGS. 1 and 2 show a motor actuated bell 10 in accordance with the present invention. An electric motor 11 is fixedly mounted on a mounting plate or base 12 by screws 13. The motor has a rotatable drive shaft 14 extending in a parallel relation to the mounting plate 12. A circular cam member 15 is fixedly mounted at its center on drive shaft 14 for rotation therewith about the axis thereof. The cam member 15 has a cam surface 15a on a surface facing the motor 11. The cam surface has a pair of diametrically-opposed raised portions 15b and a pair of recessed portions 15c disposed respectively adjacent to the raised portions (FIGS. 3 and 4).
A hammer means 16 comprises a leaf spring 16a of a rectangular shape fixedly secured at one end to a post 17 extending from the mounting plate 12, and a hammer element 16b secured ko the leaf spring 16a intermediate the opposite ends thereof. The leaf spring 16a extends in a parallel relation to the mounting plate 12 and is disposed perpendicular to the motor drive shaft 14. The leaf spring 16a has a pin 16c secured thereto at its end remote from the post 17. The pin extends perpendicularly from the leaf spring 16a toward the mounting plate 12 and being ~15~
held in sliding contact with the cam surface 15a (FIG. 2).
AS shown in FIG. 1, the mountin,,~ plate 12 is arranyed within and connected to an inverted cup-shaped gong or bell 18 by a connecting member 19 of a generally channel-shaped cross-section. The connecting member 19 is secured to the mounting plate 12 and the gong 18 by screws 20.
In operation, the motor 11 is driven through a power source (not shown) to rotate the cam member 15 in a clockwise direction (FIG. 3) so that each of the raised portions 15b of the cam surface 15a urges the leaf spring 16a and the hammer 16b away from the gong 18 via the pin 16c in sliding contact with the cam surface 15a. The pin 16c slides from the raised portion 15b into the adjacent recessed portion 15c whereupon the leaf spring 16a snaps back to allow the hammer element 16b to strike against the inner wall of the gong 18 to produce a bell sound. Thus, the gong 18 is struck twice by the hammer element 16b during one revolution of the cam member 15. During the operation of the bell 10, the hammer element 16b is moved generally in a parallel relation to the axis of rotation of the cam member 15.
FIG. 5 shows a modified bell lOa which differs from the bell 10 in that a cam surface 15a has only one raised portion 15b. With this construction, the gong 18 is struck once by thè hammer element 16b during one revolution of the cam member 15.
FIG. 6 shows another modiEied bell lOb which diEfers from the bell lOa shown in FIG. 5 only in that a modified hammer means 22 is provided. The hammer means 22 comprises a cylindrical hammer element 22a having a collar 22b fixedly mounted thereon. The hammer element 22a is i~SZ7~33 disposed in a parallel relation to the mounting plate 12 and the motor drive shaft 14. The hammer element 22a slidably extends through a pair of spaced stamped-out portions 12a of the mounting plate 12 for movement along its axis. A coil spring 22c is wound around the hammer element 22a and acts between the collar 22b and the stamped-out portion 12a. The collar 22b is held in sliding contact with the cam surface 15a of the cam member 15 by the coil spring 22c.
In operation, the motor 11 is driven to rotate the cam member 15 so that the raised portion 15b of the cam surface 15a urges the hammer element 22a away from the gong 18 against the bias of the coil spring 22c through the collar 22b in sliding contact with the cam surface 15a. The collar 22b slides from the raised portion 15b into the adjoining recessed portion 15c whereupon the hammer element 22a is moved toward the gong 18 under the action of the coil spring 22c to strike against the inner wall of the gong 18 to produce a bell sound. A plurality of raised portions 15b may be provided on the cam surface 15a.
FIG. 7 shows a further modified bell lOc which differs from the bell 10 shown in FIGS. 1 and 2 in that the cam member 15 is mounted on the drive shaft 14 with the cam surface 15a facing away from the motor 11.
In operation, the motor 11 is driven to rotate the cam member 15 so that each of the raised portions 15b urge the leaf spring 16a toward the gong 18 through the pin 16c in sliding contact with the cam surface 15a to allow the hammer element 16b to strike against the gong to produce a bell sound. Then, ~he pin 16c slides from the raised ~15;~:7133 portion 15b into the adjoining recessed portion 15c whereupon the leaf spring 16a snaps_ back to move the hammer element 16b away from the gong 18. The gong 18 is struck twice by the hammer element 16b during one revolution of the cam member 15.
FIG. 8 shows a still further modified bell lOd which differs from the bell lOc shown~in FIG. 7 in that a cam surface 15a has only one raised portion 15b. The gong 18 is struck once by the hammer element 16b during one revolution of the cam member 15.
FIG. 9 shows a further modified bell lOe which differs from the bell lOb shown in FIG. 6 in that the cam member 15 is mounted on the drive shaft 14 with the cam surface 15a facing away from the motor 11. A collar 22b is fixedly mounte~d on the end portion of the hammer element 22a remote from the gong 18, and the hammer element 22a slidably extends through the stamped-out portions 12a of the mounting plate 12 for movement along its axis. The raised portion 15b urges the hammer element 22a into striking engagement with the gong 18 through the collar 22b in sliding contact with the cam surface 15a to thereby produce a bell sound. ~ plurality of raised portions 15b may be provided on the cam surface 15a.
FIG. 10 shows a further modified bell lOf which differs from the bell 10 shown in FIGS. 1 and 2 in that a modified cam member 30 is provided. The cam member 30 of a circular shape is mounted at its center on the drive shaft 14 for rotation therewith about the axis thereof.
The cam member 30 has a cam surface 30a on the side facing the motor 11. The cam surface 30a is formed at the marginal portion of the cam member 30 and has a raised ~5~7~33 portion 30b of an arcuate contour and a flat portion 30c interrupted by the raised portion 3Db (FIG. 11). When the motor 11 is driven to rotate the cam member 30, the raised portlon 30b urges the leaf spring 16a away from the gong 18 through the pin 16c in sliding contact with the cam surface 30a, with the hammer element 16b moved from the gong 18. The pin 16c then slides from the raised portion 30b onto the flat portion 30c so that the hammer element 16b is urged into striking contact with the gong 18 under the action of the leaf spring 16a to thereby produce a bell sound.
FIG. 12 shows a further modified bell lOg which differs from the bell lOf shown in FIG. 10 in that there is provided a modified hammer means 22 which is identical in construction to the hammer means 22 shown in FIG. 6.
The raised portion 30b urges the hammer element 22a away from the gong 18 against the bias of the coil spring 22c through the collar 22b which is in sliding contact with the cam surface 30a. The collar 22b then slides from the raised portion 30b onto the flat portion 30c so that the hammer element 22a is urged into striking contact with the gong 18 under the action of the coil spring 22c to thereby prcduce a bell sound.
FIG. 13 shows a further modified bell lOh which differs from the bell lOf shown in FIG. 10 in that the cam member 30 is mounted on the drive shaft 14 with the cam surface 30a facing away from the motor 11. The raised portion 30b urges the leaf spring 16a toward the gong 18 via the pin 16c which is in sliding contact with the cam surface 30a to allow the hammer element 16b to strike against the gong 18 to produce a bell sound. The pin 16c ~:~S;~7~33 then slides from the raised portion 30b onto the flat portion 30c so that the hammer element 16b is moved away from the gong 18.
FIG. 14 shows a further modified bell lOi which differs from the bell lOg shown in FIG. 12 in that the cam member 30 is mounted on the drive shaft 14 with the cam surface 30a facing away from the motor 11. The collar 22b is fixedly mounted on the end portion of the hammer element 22a remote from the gong 18. The raised portion 30b urges the hammer element 22a into striking contact with the gong 18 via the collar 22b which is in sliding contact with the cam surface 30a to thereby produce a bell sound..
A plurality of raised portions 30b may be provided on the cam surface; 30a of the cam member 30 for the bells shown in FIGS. 10 to 14.
FIG. 15 shows a further modified bell lOj which differs from the bell lOh shown in FIG. 13 in that a modified cam member 33 is provided. As best shown in FIG.
16, the cam member 33 of a circular shape is mounted on ~ the drive shaft 14 at its center and has a cam surface 33a ,~ on the side facing away from the motor 11. The cam surface 33a is formed at the marginal portion of the cam member 33 and has a raised portion 33b. The leaf spring 16a has a projection 16e intermediate the hammer element 16b and the post 17, the projection 16e being engageable with the raised portion 33b. When the motor 11 is driven to rotate the cam member 33, the raised portion 33b is brought into engagement with the projection 16e to urge the leaf spring 16a toward the gong 18 so that the hammer element 16b is caused to strike against the gong 18 to :;
~15~2783 produce a bell sound. The raised portion 33b then becomes disengaged from the projection 16e to move the hammer element 16b away from the gong 18 under the bias of the leaf spring 16a.
FIG. 17 shows a further modified bell lOk which differs from the bell lOj shown in FIG. 15 in that the cam member 33 is mounted on the drive shaft 14 with the cam surface 33a facing the motor 11. The raised portion 33b is brought into engagement with the projection 16e to urge the leaf spring 16a and the hammer element 16b away from the gong 18. The raised portion 33b then becomes disengaged from the projection 16e so that the hammer element 16b is caused to strike against the gong 18 under the bias of the leaf spring 16a to produce a bell sound.
A plurality of raised portions 33b may be formed on the cam surface 33a of the cam member 33 for the bells shown in FIGS. 15 and 17.
FIG. 18 shows a further modified bell 101 which differs from the bell 10 shown in FIGS. 1 and 2 in that a modified cam member 35 is provided. The cam member 35 comprises a cylindrical body mounted at its center on the drive shaft 14 for rotation therewith about its axis. The cam body has a zigzag slot 35a formed in the cylindrical surface, The zigzag slot 35a has a pair of diametrically opposed apexes 35b and is asymmetry with respect to the axis of the cylindrical cam member 35. The pin 16c is received in the slot 35a for movement therealong. The pin is secured to the leaf spring 16a intermediate the hammer element 16b and the post 17. The motor 11 is driven to rotate the cam member 35 so that the pin 16c slides along the slot 35a to impart a swinging movement to the hammer 7~3~
element 16b through the leaf spring 16a. The hammer element 16b is moved generally in a parallel relation to the axis of rotation of the cam member 35. When the pin 16c slides into the apex 35b of the slot ~5, the hammer element 16b strikes against the gong 18 to produce a bell sound. It will be appreciated that the gong 18 is struck twice by the hammer element 16b during one revolution of the cam member 35.
FIG. 19 shows a further modified bell lOm which differs from the bell 101 shown in FIG. 18 in that a modified cylindrical cam member 35 is provided. A zigzag slot 35a formed in the cylindrical surface of the cam member 35 is symmetrical with respect to the axis of the cam member 35.
With the c~,nstruction of the above described motor actuated bells, the cam member acts on the hammer means via the pin 16c or the projection 16e in such a manner that the motor drive shaft, on which the cam member is mounted, axially supports the load applied by the hammer means. Therefore, the motor drive shaft is not substantially subjected to undue lateral forces and hence the motor is capable of functioning properly for a prolonged period of time.
A speed reducer may be connected between the motor drive shaft and the cam member to actuate the hammer means ~;' at a lower speed. In this case, a shaft supporting the cam member is arranged to axially support the load applied by the hammer means A Therefore, associated bearing members for this support shaft are not subjected to undue forces.
Claims (3)
1. A motor actuated bell which comprises:
(a) a base;
(b) a gong mounted on said base;
(c) a motor mounted on said base within said gong and having a rotatable drive shaft extending in parallel relation to said base;
(d) a hammer means comprising (i) a hammer element for striking against the inner wall of said gong and (ii) a leaf spring fixedly secured at one end thereof to said base and extending in parallel spaced relation thereto, said leaf spring carrying said hammer element at the other end thereof; and (e) a circular cam member operatively and fixedly connected to said motor drive shaft for rotation therewith about the axis of said shaft, said cam member having a cam surface for acting directly on said leaf spring for moving said hammer element toward and away from the inner wall of said gong, and said leaf spring being disposed perpendic-ular to the axis of said cam member.
(a) a base;
(b) a gong mounted on said base;
(c) a motor mounted on said base within said gong and having a rotatable drive shaft extending in parallel relation to said base;
(d) a hammer means comprising (i) a hammer element for striking against the inner wall of said gong and (ii) a leaf spring fixedly secured at one end thereof to said base and extending in parallel spaced relation thereto, said leaf spring carrying said hammer element at the other end thereof; and (e) a circular cam member operatively and fixedly connected to said motor drive shaft for rotation therewith about the axis of said shaft, said cam member having a cam surface for acting directly on said leaf spring for moving said hammer element toward and away from the inner wall of said gong, and said leaf spring being disposed perpendic-ular to the axis of said cam member.
2. A bell according to claim 1, in which said leaf spring has a pin secured thereto and said cam surface acts on said pin in such a manner that said pin slides along the surface of said cam.
3. A motor actuated bell according to claim 1, wherein said leaf spring has a pin secured thereto, said cam member comprises a cylindrical member having a zigzag slot formed in the cylindrical surface thereof, and said pin is received in said slot for movement therealong.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55-102291 | 1980-07-19 | ||
| JP1980102291U JPS631355Y2 (en) | 1980-07-19 | 1980-07-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1152783A true CA1152783A (en) | 1983-08-30 |
Family
ID=14323500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000368925A Expired CA1152783A (en) | 1980-07-19 | 1981-01-20 | Motor actuated bell |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS631355Y2 (en) |
| CA (1) | CA1152783A (en) |
| GB (1) | GB2080595B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4692741A (en) * | 1984-06-29 | 1987-09-08 | Kobishi Electric Co., Ltd. | Motor actuated buzzer assembly with a plurality of leaf springs of different frequencies |
| JPS6122099U (en) * | 1984-07-14 | 1986-02-08 | コビシ電機株式会社 | motor tab the |
| JPS6113898U (en) * | 1984-06-29 | 1986-01-27 | コビシ電機株式会社 | motor tab the |
| JPH0743759Y2 (en) * | 1989-11-15 | 1995-10-09 | コビシ電機株式会社 | Motor driven bell |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56130997U (en) * | 1980-03-07 | 1981-10-05 |
-
1980
- 1980-07-19 JP JP1980102291U patent/JPS631355Y2/ja not_active Expired
-
1981
- 1981-01-09 GB GB8100588A patent/GB2080595B/en not_active Expired
- 1981-01-20 CA CA000368925A patent/CA1152783A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS631355Y2 (en) | 1988-01-13 |
| GB2080595A (en) | 1982-02-03 |
| GB2080595B (en) | 1984-03-07 |
| JPS5725398U (en) | 1982-02-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |