Patent ID: 11919731
Assignee: nan
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 7:
8. A method for blocking a truck via a blocking device (11, 40) having a height-adjustable blocking arm (24, 41, 42) intended for installation in a shaft (12, 45) in a base (13) in front of a ramp (6) of a loading and unloading station (1), wherein the at least one blocking arm (24, 41, 42) is extendable from the shaft (12, 45) and includes a telescopable plunger (28, 54), wherein a section of the blocking arm including the plunger (28, 54) is movable and pivotable until the telescopable plunger is oriented obliquely upward and against the direction of travel of the truck to contact the underride guard when the truck is located on the base adjacent the ramp, the plunger including a pressure switch which initiates a signal when the plunger is not in contact with the underride guard, the signal causing the plunger to be adjusted, in order to contact the underride guard and fix the truck underride guard (5) between the plunger (28, 54) of the at least one blocking arm (24, 41, 42) and the ramp (6), and thus prevent a rolling-away or driving-away of the truck (2), the blocking device being part of an assembly further having the loading and unloading station including the ramp and the shaft housed in the base in front of the ramp, wherein the blocking device further includes a sensor and is housed in the shaft, the method comprising the following successive steps:
(a) allowing a truck to drive onto the base adjacent the ramp of the loading and unloading station;
(b) registering, via the sensor that the truck has driven onto the ramp of the loading and unloading station, and emitting a signal to a control unit of the blocking device;
(c) in response to the signal, driving the at least one blocking arm out of the shaft disposed in the base in front of the ramp,
(d) in response to the signal, moving the plunger of the at least one blocking arm until the plunger is oriented obliquely upward and against the direction of travel of the truck and until the plunger is contacting the underride guard,
(e) the pressure switch of the plunger initiating a signal when the plunger is not in contact with the underride guard, and
(f) in response to the signal from the pressure switch, adjusting the plunger in order to contact the underride guard, so that the truck underride guard is fixed between the plunger of the at least one blocking arm and the ramp.