| 摘要 |
A pit-mounted dockboard which eliminates the need for a conventional sub-frame and has an improved mechanism for retracting the cross traffic legs when the ramp is moved to a downwardly inclined below dock level position. The dockboard includes a ramp hinged to the supporting structure and movable from a horizontal cross traffic position to an upwardly inclined position and to a downwardly inclined below dock level position. A pair of cross traffic legs are pivoted to the forward portion of the ramp and are movable between an upright supporting position and a rearwardly pivoted retracted position. The cross traffic legs when in the supporting position engage the bottom of the pit in the loading dock to support the ramp in the cross traffic position. Locking means are engageable with the cross traffic legs to prevent the cross traffic legs from being pivoted to the retracted position when the ramp is in the cross traffic position. A gas spring assembly interconnects the cross traffic legs and an arm connected to the ramp to provide a toggle mechanism. The toggle mechanism can be manually moved to an overcenter position to load the gas spring, so that when the ramp is pivoted upwardly, the force of the gas spring assembly will move the cross traffic legs to the retracted position, so that the ramp can then be lowered to the downwardly inclined position. When the ramp reaches the downwardly inclined position, the toggle mechanism is automatically returned to the undercenter position so that the cross traffic legs can be returned to the upright supporting position on elevation of the ramp. An improved telescopic maintenance strut assembly is incorporated with the dockboard to hold the dockboard at an upwardly inclined position for maintenance.
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