Bell tone apparatus for a clock |
|||||||
| 申请号 | US47463674 | 申请日 | 1974-05-30 | 公开(公告)号 | US3908352A | 公开(公告)日 | 1975-09-30 |
| 申请人 | KIENZLE UHRENFABRIKEN GMBH; | 发明人 | HAAG ALBRECHT; | ||||
| 摘要 | A clock, having a shaft which rotates in unison with the clock hands, is provided with a bell tone apparatus adapted to be actuated at periodic intervals to provide an audible tone. The apparatus comprises a bell mounted on the clock housing, a hammer supported by a spring adjacent the bell, and a cam mounted on the shaft for rotation with the shaft, the cam being located at a position adjacent the hammer to engage the hammer and move it progressively away from the bell as the shaft rotates. The cam is shaped to release the hammer from engagement therewith at a predetermined angular position of the rotating shaft whereby the released hammer is impelled by the spring back toward the bell to strike the bell and thereby provide an audible tone. | ||||||
| 权利要求 | 1. A bell tone apparatus for attachment to a clock housing and adapted to be actuated at periodic intervals during the operation of the clock to provide an audible tone, the clock having at least one shaft which rotates in unison with the hands of the clock and having a portion which is accessible from the exterior of said housing, said apparatus comprising a bell, mounting means for attaching said bell to said clock housing, a hammer supported by said bell mounting means for movement adjacent said bell, a cam mounted on said accessible portion of said shaft for rotation with said shaft, said cam being located at a position adjacent said hammer for engaging said hammer to move said hammer progressively away from said bell as said shaft rotates, said cam being shaped to release said hammer from engagement therewith at a predetermined angular position of said rotating shaft whereby said released hammer is impelled back toward said bell to strike said bell and thereby provide an audible tone when said rotating shaft reaches said predetermined angular position. 2. The apparatus of claim 1 wherein said cam is mounted on a manually rotatable shaft which is provided to regulate the positions of the hands of the clock. 3. The apparatus of claim 2 wherein said manually rotatable shaft is connected by gear means to the shaft which supports the minute hand of the clock. 4. The apparatus of claim 1 wherein said cam surrounds said shaft and is provided with an inclined ramp surface which extends through an arc less than 360*. 5. The apparatus of claim 1 wherein said hammer is supported on said bell mounting means by a spring which is placed under increasing tension as said hammer is moved progressively away from said bell, said spring being operative to forcibly impel said hammer toward said bell when said hammer is released from engagement with said cam. 6. The apparatus of claim 5 wherein said bell mounting means comprises attachment means for removably attaching said bell and its associated spring-supported hammer to the housing of the clock. 7. The apparatus of claim 6 wherein said attachment means includes resilient means for snap connecting said apparatus to the housing of the clock. 8. The apparatus of claim 1 wherein said cam is adapted to be angularly displaced about said shaft, and means for locking said cam to said shaft at a desired angular position on said shaft to correlate the angular positions of said cam and the minute hand of the clock. 9. The apparatus of claim 1 wherein the minute hand of said clock is adapted to be angularly displaced relative to the minute hand shaft of the clock, and means for selectively locking said minute hand at a desired angular position on the minute hand shaft of the clock to correlate the angular positions of said cam and minute hand. |
||||||
| 说明书全文 | |||||||
QQ群二维码
意见反馈
意见反馈