Lift assembly and spa including the same
A lift assembly for a spa cover is disclosed. The spa cover is for covering an open upper end of a spa. The lift assembly includes a lever arm having a first portion for supporting a spa cover, and a first end for pivotable coupling to a sidewall of a spa for rotation of the lever arm between a closed position in which the spa cover rests on the upper end of the spa, and an open position in which the spa cover is displaced from the upper end of the spa. The lift assembly also includes a resilient spring having a first end coupled to the lever arm, and a second end for coupling to the sidewall of the spa. In the open position of the lever arm, the spring urges the lever arm to rotate toward the closed position. A spa including the lift assembly is also disclosed.
1. A lift assembly for a spa cover, the spa cover for covering an open upper end of a spa, the lift assembly comprising:
a lever arm having a first portion for supporting a spa cover, and a first end for pivotable coupling to a sidewall of a spa for rotation of the lever arm about an axis between a closed position in which the spa cover rests on the upper end of the spa, and an open position in which the spa cover is displaced from the upper end of the spa, the first end extending substantially parallel to the axis;
a pneumatic spring comprising a pneumatic cylinder and a piston rod, and having a first end and a second end, the first end of the pneumatic spring pivotally coupled to the lever arm, the pneumatic spring pivoting about the second end as the lever arm moves between the open and closed positions so that in the open position of the lever arm, the pneumatic spring urges the lever arm to rotate toward the closed position, and in the closed position of the lever arm, the pneumatic spring urges the lever arm to rotate toward the open position,
wherein in use, one of:
the spring applies an extensive force to the lever arm in each of the open and closed positions, or
the spring applies a compressive force to the lever arm in each of the open and closed positions.
2. The lift assembly of claim 1 , wherein:
the lever arm is rotatable between the closed position and the open position by way of an intermediate position, and
in use, the first portion of the lever arm is positioned higher in the intermediate position than in the closed and open positions.
3. The lift assembly of claim 1 , wherein:
the lever arm is rotatable between the closed position and the open position by way of an intermediate position, and
in use, the lever arm is vertically aligned with a direction of gravity in the intermediate position.
4. The lift assembly of claim 1 further comprising:
a driving member coupled to the first end of the lever arm for rotation with the lever arm about the axis, the driving member extending substantially perpendicular to the axis.
5. The lift assembly of claim 4 , wherein:
the lever arm includes an intermediate portion between the first end of the lever arm and the first portion, and
the driving member is spaced apart from the intermediate portion in a direction parallel to the axis.
6. The lift assembly of claim 4 , further comprising a rotator drivingly coupled to the driving member and operable to automatically move the lever arm between the open and closed positions.
7. The lift assembly of claim 6 , wherein the rotator is a motor user-operable by an actuator to selectively move the lever arm between the open and closed positions.
8. The lift assembly of claim 6 , wherein the driving member is a sprocket, the lift assembly further comprises a chain drivingly coupled to the sprocket, and the rotator is a linear motor drivingly coupled to the chain.
9. The lift assembly of claim 6 , wherein:
the driving member is a first sprocket,
the lift assembly further comprises a second sprocket, and a chain coupling the first and second sprockets, and
the rotator is a rotary motor drivingly coupled to the second sprocket for rotating the second sprocket.
10. The lift assembly of claim 1 , wherein the pneumatic spring is single acting.
11. A lift assembly for a spa cover, the spa cover for covering an open upper end of a spa, the lift assembly comprising:
a lever arm having a first portion for supporting a spa cover, and a first end for pivotable coupling to a sidewall of a spa for rotation of the lever arm about an axis between a closed position in which the spa cover rests on the upper end of the spa, and an open position in which the spa cover is displaced from the upper end of the spa, the first end extending substantially parallel to the axis;
a single-acting pneumatic spring comprising a pneumatic cylinder and a piston rod, and having a first end and a second end, the first end of the pneumatic spring pivotally coupled to the lever arm, the pneumatic spring pivoting about the second end as the lever arm moves between the open and closed positions so that in the open position of the lever arm, the pneumatic spring urges the lever arm to rotate toward the closed position, and in the closed position of the lever arm, the pneumatic spring urges the lever arm to rotate toward the open position.