Patent ID: 6502267
Filing Date: 2003-01-07
Classification: B66B

Abstract:
A conveyor crossover for a personnel walkway over a conveyor which is operable to move material in a horizontal direction, comprising:a pair of upright supports adjacent one lateral side of said conveyor, one of said supports being disposed at one side of said walkway and the other of said supports being disposed at the other side of said walkway; a flat ramp having one end pivotally connected to said supports on a first horizontal axis transverse to said walkway for pivotal movement between a substantially horizontal position in which said ramp bridges said conveyor and an upright position in which said ramp is out of the path of said material being moved via said conveyor, said ramp having laterally opposite sides; first and second extensible and contractible fluid actuators having first corresponding ends pivotally connected, respectively to said supports on a second horizontal axis parallel to and above said first horizontal axis and having second corresponding ends pivotally connected respectively to said laterally opposite sides of said ramp on a third horizontal axis parallel to said first and second horizontal axis, said ramp being in said substantially horizontal position when said first and second fluid actuators are extended and said ramp being in said upright position when said fluid actuators are contracted and a fluid control system including a source of pressure fluid, a control valve connected in pressure fluid receiving relation to said source of pressure fluid and connected in controlling relation to said first and second fluid actuators, said control valve including a flow control element having raise, lower and emergency stop positions of adjustment and first and second manually operated controls positioned on opposite sides, respectively, of said conveyor, each said controls being operable to move said flow control element to said positions of adjustment.