Hoist cable overload detection systems and methods
First Claim
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1. A hoist hook assembly, comprising:
- a first plate;
a hook mechanically coupled to the first plate;
a second plate spaced a distance from and mechanically coupled to the first plate by a spring; and
a switch mechanically coupled to the plate and configured to translate into a triggered position in response to a predetermined load on the hook,wherein the switch comprises;
a pin disposed in an opening formed in the first plate with the pin having an untriggered position and a triggered position, wherein the pin is configured to translate from the untriggered position into the triggered position in response to a displacement of the first plate relative to the second plate;
a pin retention spring disposed in a cavity defined by the first plate; and
a pin retention head coupled to the pin retention spring and configured to rest in a first groove formed in the pin in response to the pin being in the untriggered position.
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Abstract
A hoist hook assembly having a cable overload detection system may include a plate, a hook mechanically coupled to the plate, and a switch mechanically coupled to the plate. The switch may be configured to translate into a triggered position in response to a load on the hook indicative of an overload condition.
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Citations
16 Claims
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1. A hoist hook assembly, comprising:
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a first plate; a hook mechanically coupled to the first plate; a second plate spaced a distance from and mechanically coupled to the first plate by a spring; and a switch mechanically coupled to the plate and configured to translate into a triggered position in response to a predetermined load on the hook, wherein the switch comprises; a pin disposed in an opening formed in the first plate with the pin having an untriggered position and a triggered position, wherein the pin is configured to translate from the untriggered position into the triggered position in response to a displacement of the first plate relative to the second plate; a pin retention spring disposed in a cavity defined by the first plate; and a pin retention head coupled to the pin retention spring and configured to rest in a first groove formed in the pin in response to the pin being in the untriggered position. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A hoist cable overload detection system, comprising:
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a first plate; a spring mechanically coupled to the first plate; a second plate mechanically coupled to the spring and oriented with the spring between the first plate and the second plate; a pin disposed in an opening formed in the first plate with the pin having an untriggered position and a triggered position, wherein the pin is configured to translate from the untriggered position into the triggered position in response to a displacement of the first plate relative to the second plate; a pin retention spring disposed in a cavity defined by the first plate; and a pin retention head coupled to the pin retention spring and configured to rest in a first groove formed in the pin in response to the pin being in the untriggered position. - View Dependent Claims (8, 9, 10, 11)
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12. A method of detecting an overload condition on a hoist assembly, comprising:
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setting a switch on a hoist hook assembly to an untriggered position with the switch configured to translate to a triggered position in response to the overload condition; applying a load to the hoist hook assembly; and detecting the switch in the triggered position in response to an occurrence of the overload condition, wherein the hoist assembly comprises; a first plate; a spring mechanically coupled to the first plate; a second plate mechanically coupled to the spring and oriented with the spring between the first plate and the second plate; a pin disposed in an opening formed in the first plate with the pin having an untriggered position and a triggered position, wherein the pin is configured to translate from the untriggered position into the triggered position in response to a displacement of the first plate relative to the second plate; a pin retention spring disposed in a cavity defined by the first plate; and a pin retention head coupled to the pin retention spring and configured to rest in a first groove formed in the pin in response to the pin being in the untriggered position. - View Dependent Claims (13, 14, 15, 16)
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Specification