Linear actuator
First Claim
Patent Images
1. A linear actuator which comprises:
- a cabinet,a spindle mounted in the cabinet which includes a spindle nut secured against rotation,an activation rod having an end connected to the spindle nut,a reversible DC motor mounted in the cabinet,a worm gear for operatively connecting the reversible DC motor with the spindle,a power supply having a DC output for the DC motor,a controller, anda memory unit for collecting at least one set of data from operation of the linear actuator which indicates a time period the linear actuator has operated and power used during said time period, said memory unit being configured for communication with a means for evaluating a mechanical state of said linear actuator based on at least said one set of data stored in said memory unit.
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Abstract
A linear actuator comprises a reversible electric motor (2) which, via a transmission, is capable of driving a spindle (4) having a spindle nut (5) secured against rotation and comprises a power supply and a controller. The actuator moreover comprises a memory unit for collecting at least one set of data from the operation, indicating how long and how hard the actuator has worked. It is hereby possible to obtain an overview of the mechanical state of the actuator and thereby prevent unfortunate occurrences and accidents as a consequence of wear-out of the actuator.
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Citations
32 Claims
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1. A linear actuator which comprises:
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a cabinet, a spindle mounted in the cabinet which includes a spindle nut secured against rotation, an activation rod having an end connected to the spindle nut, a reversible DC motor mounted in the cabinet, a worm gear for operatively connecting the reversible DC motor with the spindle, a power supply having a DC output for the DC motor, a controller, and a memory unit for collecting at least one set of data from operation of the linear actuator which indicates a time period the linear actuator has operated and power used during said time period, said memory unit being configured for communication with a means for evaluating a mechanical state of said linear actuator based on at least said one set of data stored in said memory unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A lifter mechanism for lifting a patient from a hospital bed, said lifter mechanism comprising:
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a linear actuator electrically coupled to a hand control for control of the lifter mechanism by a user through selective operation of the linear actuator, the linear actuator includes; a cabinet, a spindle mounted in the cabinet which includes a spindle nut secured against rotation, an activation rod having an end connected to the spindle nut, a reversible DC motor mounted in the cabinet, a worm gear for operatively connecting the reversible DC motor with the spindle, a power supply having a DC output for the DC motor, a controller, and a memory unit for collecting at least one set of data from operation of the linear actuator which indicates a time period the linear actuator has operated and power used during said time period, said memory unit being configured for communication with a means for evaluating a mechanical state of the linear actuator based on at least the one set of data stored in the memory unit.
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17. A linear actuator which comprises:
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a cabinet, a spindle mounted in the cabinet which includes a spindle nut secured against rotation, an activation rod having an end connected to the spindle nut, a reversible DC motor mounted in the cabinet, a worm gear for operatively connecting the reversible DC motor with the spindle, a power supply having a DC output for the DC motor, a controller configured to control the operation of the linear actuator in response to a user command given by a user using a hand control coupled to the controller, and a memory unit for collecting at least one set of data when the linear actuator is operated by the controller, the at least one set of data indicating at least a time period the linear actuator has operated and the power used during said time period, said memory unit being configured for communication with a means for evaluating a mechanical state of said linear actuator based on at least said one set of data stored in said memory unit. - View Dependent Claims (18)
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19. A linear actuator which comprises:
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a cabinet, a spindle mounted in the cabinet which includes a spindle nut secured against rotation, an activation rod having an end connected to the spindle nut, a reversible DC motor mounted in the cabinet, a transmission for operatively connecting the reversible DC motor with the spindle, a power supply having a DC output for the DC motor, a controller, and a memory unit for collecting at least one set of data from operation of the linear actuator which indicates a time period the linear actuator has operated and power used during said time period, said memory unit being configured for communication with a means for evaluating a mechanical state of said linear actuator based on at least said one set of data stored in said memory unit. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification