Safety device for electromechanical opening and closing mechanism
First Claim
1. A safety device for an electromechanical opening and closing mechanism with a mobile member, comprising:
- driving means for driving said mobile member,load signal detecting means connected to said driving means for detecting a load applied to said driving means and for producing a load signal corresponding thereto,set signal generating means connected to said load signal detecting means for generating set signals as criteria for judging abnormal loads, anddrive control means connected to said load signal detecting means and said set signal generating means for comparing the load signal from said load signal detecting means with set signals from said set signal generating means and controlling said driving means in accordance with the result of said comparison;
said set signal generating means comprising,first set signal generating means for generating a first set signal which is higher than said load signal by a predetermined level and follows said load signal after delay of a predetermined time period,second set signal generating means for generating a second set signal with a level determined by predetermined positions of said mobile member,said drive control means including means for applying to said driving part a stop signal when the level of said load signal exceeds either of said first set signal and said second set signal.
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Accused Products
Abstract
A safety device for an electromechanical opening and closing mechanism, such as an automotive sun roof, which interrupts a circuit for driving the mechanism when a load on the circuit happens to exceed a certain set value in an abnormal case such as when a foreign object is caught in the mechanism. The set value is either a first set value which varies in accordance with the above-noted load or a second set value which is determined by the position of the movable part of the above-noted mechanism. The safety device functions when a load exceeds either of the two set values. The first set value is effective against a load variation, particularly a load decrease, to prevent a decrease in sensitivity decrease of the safety device, while the second set value is effective against an increase in load, particularly a slow increase, to prevent an overload on the mechanism. Thus, the safety device prevents damage to the mechanism and the foreign object caught in the mechanism, while the device maintains a high sensitivity.
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Citations
9 Claims
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1. A safety device for an electromechanical opening and closing mechanism with a mobile member, comprising:
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driving means for driving said mobile member, load signal detecting means connected to said driving means for detecting a load applied to said driving means and for producing a load signal corresponding thereto, set signal generating means connected to said load signal detecting means for generating set signals as criteria for judging abnormal loads, and drive control means connected to said load signal detecting means and said set signal generating means for comparing the load signal from said load signal detecting means with set signals from said set signal generating means and controlling said driving means in accordance with the result of said comparison; said set signal generating means comprising, first set signal generating means for generating a first set signal which is higher than said load signal by a predetermined level and follows said load signal after delay of a predetermined time period, second set signal generating means for generating a second set signal with a level determined by predetermined positions of said mobile member, said drive control means including means for applying to said driving part a stop signal when the level of said load signal exceeds either of said first set signal and said second set signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification