| 摘要 |
A lift mechanism (15) for the cover (13) of a portable spa or hot tub (11) comprising a pair of compressible struts (21) and upper and lower hinge mechanisms (24 and 23) is disclosed. The preferred lower hinge mechanism (23) includes a torque tube (25) rotatably mounted through bushings (31) housed in plates (27). The plates (27) are located at a pair of adjacent lower corners of the spa or hot tub (11) and held down by the weight of the spa or hot tub (11). The struts (21) are attached to the ends of the torque tube (25). The other ends of the struts are attached to opposite sides of the spa cover by the upper hinge mechanisms (24), which preferably include brackets (33) that are fixed to the cover and pivot nuts (71) that rotatably attach the brackets (33) to the struts (21). When the cover is in its closed position, the struts (21) incline upwardly toward the center of the spa or hot tub (11). When the cover (13) is in its open position, the struts (21) lie substantially vertical. A stop mechanism formed by pairs of bolts (55 and 61) prevents the struts (21) from overrotating, i.e., rotating beyond a vertical position.
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