Lift with lifting mast collision control apparatus
First Claim
1. A system, comprising:
- a lift device includes a lifting mast having a top, and a drive assembly for moving the lifting mast in lifting and lowering directions;
a head is positioned above and over the top of the lifting mast, and is mounted to the lifting mast for displacement between a neutral position away from the top of the lifting mast and a safe position toward the top of the lifting mast in response to the head contacting an object above the top of the lifting mast and the head;
the drive assembly is enabled for moving the lifting mast in the lifting and lowering directions, when the head is in the neutral position;
the drive assembly is enabled for moving the lifting mast in the lowering direction, when the head is in the safe position; and
the drive assembly is disabled from moving the lifting mast in the lifting direction, when the head is in the safe position.
1 Assignment
0 Petitions
Accused Products
Abstract
A lift device includes a lifting mast having a top, and a drive assembly for moving the lifting mast in lifting and lowering directions. A head is positioned above and over the top of the lifting mast, and is mounted to the lifting mast for displacement between a neutral position and a safe position with respect to the lifting mast in response to the head contact encountering an object above the top of the lifting mast and the head. The drive assembly is enabled for moving of the lifting mast in the lifting and lowering directions in the neutral position of the head, the drive assembly is enabled for moving the lifting mast in the lowering direction in the safe position of the head, and the drive assembly is disabled for moving the lifting mast in the lifting direction in the safe position of the head.
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Citations
28 Claims
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1. A system, comprising:
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a lift device includes a lifting mast having a top, and a drive assembly for moving the lifting mast in lifting and lowering directions; a head is positioned above and over the top of the lifting mast, and is mounted to the lifting mast for displacement between a neutral position away from the top of the lifting mast and a safe position toward the top of the lifting mast in response to the head contacting an object above the top of the lifting mast and the head; the drive assembly is enabled for moving the lifting mast in the lifting and lowering directions, when the head is in the neutral position; the drive assembly is enabled for moving the lifting mast in the lowering direction, when the head is in the safe position; and the drive assembly is disabled from moving the lifting mast in the lifting direction, when the head is in the safe position. - View Dependent Claims (2, 3, 4)
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5. A system, comprising:
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a lift device includes a lifting mast having a top, and a drive assembly for moving the lifting mast in lifting and lowering directions; a head is positioned above and over the top of the lifting mast, and is mounted to the lifting mast for displacement between a neutral position away from the top of the lifting mast and a safe position toward the top of the lifting mast in response to the head contacting an object above the top of the lifting mast and the head; a switch is operatively coupled to the drive assembly; the switch interacts between the head and the lifting mast, wherein the switch; enables the drive assembly for moving the lifting mast in the lifting and lowering directions, when the head is in the neutral position; disables the drive assembly from moving the lifting mast in the lifting direction, when the head is in the safe position; and enables the drive assembly for moving the lifting mast in the lowering direction, when the head is in the safe position. - View Dependent Claims (6, 7, 8)
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9. A system, comprising:
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a lift device includes a lifting mast having a top, and a drive assembly for moving the lifting mast in lifting and lowering directions; a base is removably coupled to the top of the lifting mast; a head is positioned above and over the base and the top of the lifting mast, and is mounted to the base for displacement between a neutral position away from the base and the top of the lifting mast and a safe position toward the base and the top of the lifting mast in response to the head contacting an object above the base and the top of the lifting mast; the drive assembly is enabled for moving the lifting mast in the lifting and lowering directions, when the head is in the neutral position; the drive assembly is enabled for moving the lifting mast in the lowering direction, when the head is in the safe position; and the drive assembly is disabled from moving the lifting mast in the lifting direction, when the head is in the safe position. - View Dependent Claims (10, 11, 12)
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13. A system, comprising:
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a lift device includes a lifting mast having a top, and a drive assembly for moving the lifting mast in lifting and lowering directions; a base is removably coupled to the top of the lifting mast; a head is positioned above and over the base and the top of the lifting mast, and is mounted to the base for displacement between a neutral position away from the base and the top of the lifting mast and a safe position toward the base and the top of the lifting mast in response to the head contacting an object above the base and the top of the lifting mast; a switch is operatively coupled to the drive assembly; the switch interacts between the head and the base, wherein the switch; enables the drive assembly for moving the lifting mast in the lifting and lowering directions, when the head is in the neutral position; disables the drive assembly from moving the lifting mast in the lifting direction, when the head is in the safe position; and enables the drive assembly for moving the lifting mast in the lowering direction, when the head is in the safe position. - View Dependent Claims (14, 15, 16)
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17. A system, comprising:
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a lift device includes a lifting mast having a top, and a drive assembly for moving the lifting mast in lifting and lowering directions; a head is positioned above and over the top of the lifting mast, and is mounted to the lifting mast for displacement between a neutral position away from the top of the lifting mast and a safe position toward the top of the lifting mast in response to the head contacting an object above the top of the lifting mast and the head; a switch is operatively coupled to the drive assembly; an abutment is coupled between the head and the switch to interact with the switch in response to movement of the head between the neutral and safe positions, wherein the switch; enables the drive assembly for moving the lifting mast in the lifting and lowering directions, when the head is in the neutral position; disables the drive assembly from moving the lifting mast in the lifting direction, when the head is in the safe position; and enables the drive assembly for moving the lifting mast in the lowering direction, when the head is in the safe position. - View Dependent Claims (18, 19, 20)
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21. A system, comprising:
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a lift device includes a lifting mast having a top, and a drive assembly for moving the lifting mast in lifting and lowering directions; a base is removably coupled to the top of the lifting mast; a head is positioned above and over the base and the top of the lifting mast, and is mounted to the base for displacement between a neutral position away from the base and the top of the lifting mast and a safe position toward the base and the top of the lifting mast in response to the head contacting an object above the base and the top of the lifting mast; a switch is operatively coupled to the drive assembly; an abutment is coupled between the head and the base and the switch, and the abutment is coupled to interact with the switch in response to movement of the head between the neutral and safe positions, wherein the switch; enables the drive assembly for moving the lifting mast in the lifting and lowering directions, when the head is in the neutral position; disables the drive assembly from moving the lifting mast in the lifting direction, when the head is in the safe position; and enables the drive assembly for moving the lifting mast in the lowering direction, when the head is in the safe position. - View Dependent Claims (22, 23, 24)
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25. A system, comprising:
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a lift device includes a lifting mast having a top, and a drive assembly for moving the lifting mast in lifting and lowering directions; a base is removably coupled to the top of the lifting mast; a head is positioned above and over the base and the top of the lifting mast, and is mounted to the base for displacement between a neutral position away from the base and the top of the lifting mast and a safe position toward the base and the top of the lifting mast in response to the head contacting an object above the base and the top of the lifting mast; a switch is carried by the base and is operatively coupled to the drive assembly; an abutment is coupled to the head, and is positioned to interact with the switch in response to movement of the head between the neutral and safe positions, wherein the switch; enables the drive assembly for moving the lifting mast in the lifting and lowering directions, when the head is in the neutral position; disables the drive assembly from moving the lifting mast in the lifting direction, when the head is in the safe position; and enables the drive assembly for moving the lifting mast in the lowering direction, when the head is in the safe position. - View Dependent Claims (26, 27, 28)
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Specification