Circuit for providing jog pulse, jog-off high limit, and low battery detect
First Claim
1. A power lifting apparatus for adjusting the height of a gurney, the gurney having a platform with a top surface for holding a person and a bottom surface, an undercarriage containing wheels, and a scissors-like structure connecting said platform to said undercarriage, said apparatus comprising:
- an electric motor attached to the gurney and capable of raising or lowering the gurney;
a battery connected to said electric motor; and
an electric circuit for controlling said electric motor, said electric circuit including a jog pulse circuit.
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Accused Products
Abstract
A compact, lightweight, power lifting unit assists the operator of a mobile patient transporter in raising or lowering the patient bed to the desired height required in transporting or transferring a patient. The power lifting unit may also be used to "collapse" the transporter to its lowest height. The power lifting unit is adaptable and may be installed on virtually any existing "X" frame transporter. Electronic controls allow a single operator to raise or lower the patient bed or allow the patient bed to coast gently to a rest position. In particular, in one embodiment the power lifting unit includes a jog pulse circuit that prevents operators from jamming the transporter. In another embodiment, the power lifting unit includes a jog-off high limit circuit that prevents operators from attempting to raise the transporter beyond its maximum height. In yet another embodiment, a power lifting unit includes a low battery detection circuit that provides both an audible and a physical indication (i.e., a pulsating response) to operators of a low battery condition (i.e., when battery voltage decreases below a predetermined level).
22 Citations
20 Claims
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1. A power lifting apparatus for adjusting the height of a gurney, the gurney having a platform with a top surface for holding a person and a bottom surface, an undercarriage containing wheels, and a scissors-like structure connecting said platform to said undercarriage, said apparatus comprising:
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an electric motor attached to the gurney and capable of raising or lowering the gurney; a battery connected to said electric motor; and an electric circuit for controlling said electric motor, said electric circuit including a jog pulse circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A power lifting apparatus for adjusting the height of a gurney, said power lifting apparatus including:
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an electric motor for driving structure which raises or lowers the gurney; a rechargeable battery connected to said electric motor; and a control circuit including an electrical switch having a first position to raise the height of the gurney, a second position to lower the height of the gurney and a third position to allow the gurney to coast to its rest position, the speed at which the gurney coasts to its rest position being controlled by the inertia of, and the friction associated with, said electric motor and the structure driven by said electric motor, said control circuit further including a jog pulse circuit. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A power lifting apparatus for adjusting the height of a gurney, said power lifting apparatus including:
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an electric motor for driving structure which raises or lowers the gurney; a rechargeable battery connected to said electric motor; a control circuit including an electrical switch having a first position to raise the height of the gurney, and a second position to lower the height of the gurney; and a jog pulse means for jogging the gurney to disengage any detent means holding the gurney at a selected height. - View Dependent Claims (19, 20)
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Specification