Program centralled, cam operated switch assembly |
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| 申请号 | US45188674 | 申请日 | 1974-03-18 | 公开(公告)号 | US3930132A | 公开(公告)日 | 1975-12-30 |
| 申请人 | DELTROL CORP; | 发明人 | HARRIS JOHN L; | ||||
| 摘要 | A heavy duty contactor mechanism for refrigeration compressor motors is directly actuated by a timing mechanism controlled by a thermostat. The timing mechanism protects against false starts from thermostat vibration, and interposes a delay between stopping and starting of the compressor sufficient to allow pressures to equalize. Power for operating the contactor switches is stored in a spring while the timer motor is running through the delay period. | ||||||
| 权利要求 | 1. In a control mechanism, a switch, cam means arranged to operate said switch, an operator, means for supporting said operator and providing a limited range of movement therefor , said operator being arranged to operate said switch conjointly with the cam means, said cam means having two separate camming portions at different levels for operating the switch, the camming portion at one level being within the range of movement of the operator providing conjoint operation of the switch, and the camming portion at the other level being beyond the range of movement of the operator to exclude operation of the switch by the operator. 2. The combination recited in claim 1 in which the cam means is constructed and arranged to actuate the switch in one direction at a predetermined position of the camming portion at said one level of the cam means, and the operator is construced and arranged to actuate the switch in the opposite direction, said cam means and switch also being constructed and arranged to enable the cam means to operate the switch in both directions at predetermined positions of the camming portion at the other level of the cam means. 3. The combination recited in claim 1 in which the switch consists of two cooperating blades each riding the cam means and the two camming portions of the cam means provide two drop-off sections, said blades and cam means being constructed and arranged to cause one blade to drop while holding the other at each of the drop-off sections, one drop off section being within the range of movement of the operator and the other drop-off section being beyond said range of movement. |
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