System for preventing semitrailer collisions with a loading ramp

1. A system for preventing semitrailer collisions with a loading ramp ( 10 ) comprising:

a guide block ( 200 ) positioned on a ground surface, laterally and/or medially to an opening of the loading ramp ( 10 ); wherein the guide block ( 200 ) comprises a first wheel blocking means configured as a sled ( 210 ) adapted for supporting treads of a rear tire ( 16 ) of a semitrailer ( 12 ), and configured to move passively from a forwarded position relative to the loading ramp ( 10 ) to a retracted position relative to the loading ramp ( 10 ) when pushed by the rear tire as the semitrailer ( 12 ) is reversing towards the loading ramp ( 10 );

a first sensor unit ( 240 ) configured for sensing when a rear end of the semitrailer ( 12 ) is approaching the guide block ( 200 );

a second sensor unit ( 100 ) configured for sensing when the rear end of the semitrailer ( 12 ) is approaching the loading ramp ( 10 ); wherein the second sensor unit ( 100 ) is configured to send a blocking signal to the guide block ( 200 ) when a distance between the rear end of the semitrailer ( 12 ) and the loading ramp ( 10 ) is below a preset threshold, thereby blocking movement of the sled ( 210 );

a third sensor unit ( 250 ), configured for sensing when an object is positioned in an area bounded by the guide block ( 200 ) and the loading ramp ( 10 ); wherein the third sensor unit ( 250 ) is configured to send a blocking signal to the guide block ( 200 ) when the object is positioned in the area bounded by the guide block ( 200 ) and the loading ramp ( 10 ), wherein the first wheel blocking means locks in position in response to the blocking signal, thereby blocking the movement of the sled ( 210 );

wherein the first sensor unit ( 240 ) is configured to send an activation or wakeup signal to the third sensor unit ( 250 ) when the rear end of the semitrailer ( 12 ) is sensed approaching the guide block ( 200 ), the system further comprising

at least one piston ( 227 , 228 ), wherein the sled ( 210 ) is connected to a locking means comprising a toothed rack ( 220 ), and a first locking pin ( 225 ) and a second locking pin ( 230 ) configured to engage with the toothed rack ( 220 ) when the sled ( 210 ) is in the forwarded position relative to the loading ramp ( 10 ), and configured to disengage from the toothed rack ( 220 ) upon receipt of an activation or wakeup signal from the first sensor unit ( 240 ), and wherein the first locking pin ( 225 ), or the second locking pin ( 230 ), or both the first locking pin and the second locking pin are engaged with the toothed rack ( 220 ), or disengaged from the toothed rack ( 220 ), or both engaged with and disengaged from the toothed rack by means of said at least one piston ( 227 , 228 ).

2. A system for preventing semitrailer collisions with a loading ramp ( 10 ) comprising:

a guide block ( 200 ) positioned on a ground surface, laterally and/or medially to an opening of the loading ramp ( 10 ); wherein the guide block ( 200 ) comprises a first wheel blocking means configured as a sled ( 210 ) adapted for supporting treads of a rear tire ( 16 ) of a semitrailer ( 12 ), and configured to move passively from a forwarded position relative to the loading ramp ( 10 ) to a retracted position relative to the loading ramp ( 10 ) when pushed by the rear tire as the semitrailer ( 12 ) is reversing towards the loading ramp ( 10 );

a first sensor unit ( 240 ) configured for sensing when a rear end of the semitrailer ( 12 ) is approaching the guide block ( 200 );

a second sensor unit ( 100 ) configured for sensing when the rear end of the semitrailer ( 12 ) is approaching the loading ramp ( 10 ); wherein the second sensor unit ( 100 ) is configured to send a blocking signal to the guide block ( 200 ) when a distance between the rear end of the semitrailer ( 12 ) and the loading ramp ( 10 ) is below a preset threshold, thereby blocking movement of the sled ( 210 );

a third sensor unit ( 250 ), configured for sensing when an object is positioned in an area bounded by the guide block ( 200 ) and the loading ramp ( 10 ); wherein the third sensor unit ( 250 ) is configured to send a blocking signal to the guide block ( 200 ) when the object is positioned in the area bounded by the guide block ( 200 ) and the loading ramp ( 10 ), wherein the first wheel blocking means locks in position in response to the blocking signal, thereby blocking the movement of the sled ( 210 );

wherein the first sensor unit ( 240 ) is configured to send an activation or wakeup signal to the third sensor unit ( 250 ) when the rear end of the semitrailer ( 12 ) is sensed approaching the guide block ( 200 ), the system further comprising

at least one piston ( 227 , 228 ), wherein the sled ( 210 ) is connected to a locking means comprising a toothed rack ( 220 ), and a first locking pin ( 225 ) and a second locking pin ( 230 ); and wherein the first locking pin ( 225 ) and the second locking pin ( 230 ) are configured to engage with the toothed rack ( 220 ) when the sled ( 210 ) is in the forwarded position relative to a loading ramp ( 10 ), and are configured to disengage from the toothed rack ( 220 ) upon receipt of an activation or wakeup signal from the first sensor unit ( 240 ), wherein the first locking pin ( 225 ), the second locking pin ( 230 ), or both, are engaged, disengaged, or both engaged with and disengaged from the toothed rack ( 220 ) by means of the at least one piston ( 227 , 228 ); and wherein the first locking pin ( 225 ) is configured as a pivotable lever arm with a free end shaped to fit between two neighboring teeth of the toothed rack ( 220 ), and wherein the lever arm is connected to the at least one piston ( 227 ) via a wire or chain ( 229 ).

3. A system for preventing semitrailer collisions with a loading ramp ( 10 ) comprising:

a guide block ( 200 ) positioned on a ground surface, laterally and/or medially to an opening of the loading ramp ( 10 ); wherein the guide block ( 200 ) comprises a first wheel blocking means configured as a sled ( 210 ) adapted for supporting treads of a rear tire ( 16 ) of a semitrailer ( 12 ), and configured to move passively from a forwarded position relative to the loading ramp ( 10 ) to a retracted position relative to the loading ramp ( 10 ) when pushed by the rear tire as the semitrailer ( 12 ) is reversing towards the loading ramp ( 10 );

a first sensor unit ( 240 ) configured for sensing when a rear end of the semitrailer ( 12 ) is approaching the guide block ( 200 );

a second sensor unit ( 100 ) configured for sensing when the rear end of the semitrailer ( 12 ) is approaching the loading ramp ( 10 ); wherein the second sensor unit ( 100 ) is configured to send a blocking signal to the guide block ( 200 ) when a distance between the rear end of the semitrailer ( 12 ) and the loading ramp ( 10 ) is below a preset threshold, thereby blocking movement of the sled ( 210 );

a third sensor unit ( 250 ), configured for sensing when an object is positioned in an area bounded by the guide block ( 200 ) and the loading ramp ( 10 ); wherein the third sensor unit ( 250 ) is configured to send a blocking signal to the guide block ( 200 ) when the object is positioned in the area bounded by the guide block ( 200 ) and the loading ramp ( 10 ), wherein the first wheel blocking means locks in position in response to the blocking signal, thereby blocking the movement of the sled ( 210 );

wherein the first sensor unit ( 240 ) is configured to send an activation or wakeup signal to the third sensor unit ( 250 ) when the rear end of the semitrailer ( 12 ) is sensed approaching the guide block ( 200 ), the system further comprising

at least one piston ( 227 , 228 ), wherein the sled ( 210 ) is connected to a locking means comprising a toothed rack ( 220 ), and a first locking pin ( 225 ) and a second locking pin ( 230 ) configured to engage with the toothed rack ( 220 ) when the sled ( 210 ) is in the forwarded position relative to the loading ramp ( 10 ), and configured to disengage from the toothed rack ( 220 ) upon receipt of an activation or wakeup signal from the first sensor unit ( 240 ), wherein one or both of the first locking pin ( 225 ) and the second locking pin are engaged with, disengaged from, or both engaged with and disengaged from the toothed rack ( 220 ) by the aid of said at least one piston ( 227 , 228 ); and wherein the second locking pin ( 230 ) is an elongate rod ( 233 ) with a first end pivotably connected to an elongate member ( 232 ) that is pivotably connected to the piston ( 228 ); wherein a second end of the elongate rod is shaped to fit between two neighboring teeth of the toothed rack ( 220 ).

4. A system for preventing semitrailer collisions with a loading ramp ( 10 ) comprising:

a guide block ( 200 ) positioned on a ground surface, laterally and/or medially to an opening of the loading ramp ( 10 ); wherein the guide block ( 200 ) comprises a first wheel blocking means configured as a sled ( 210 ) adapted for supporting treads of a rear tire ( 16 ) of a semitrailer ( 12 ), and configured to move passively from a forwarded position relative to the loading ramp ( 10 ) to a retracted position relative to the loading ramp ( 10 ) when pushed by the rear tire as the semitrailer ( 12 ) is reversing towards the loading ramp ( 10 );

a first sensor unit ( 240 ) configured for sensing when a rear end of the semitrailer ( 12 ) is approaching the guide block ( 200 );

a second sensor unit ( 100 ) configured for sensing when the rear end of the semitrailer ( 12 ) is approaching the loading ramp ( 10 ); wherein the second sensor unit ( 100 ) is configured to send a blocking signal to the guide block ( 200 ) when a distance between the rear end of the semitrailer ( 12 ) and the loading ramp ( 10 ) is below a preset threshold, thereby blocking movement of the sled ( 210 );

a third sensor unit ( 250 ), configured for sensing when an object is positioned in an area bounded by the guide block ( 200 ) and the loading ramp ( 10 ); wherein the third sensor unit ( 250 ) is configured to send a blocking signal to the guide block ( 200 ) when the object is positioned in the area bounded by the guide block ( 200 ) and the loading ramp ( 10 ), wherein the first wheel blocking means locks in position in response to the blocking signal, thereby blocking the movement of the sled ( 210 );

wherein the first sensor unit ( 240 ) is configured to send an activation or wakeup signal to the third sensor unit ( 250 ) when the rear end of the semitrailer ( 12 ) is sensed approaching the guide block ( 200 ), the system further comprising

at least one piston ( 227 , 228 ), wherein the sled ( 210 ) is connected to a locking means comprising a toothed rack ( 220 ), and a first locking pin ( 225 ) and a second locking pin ( 230 ); and wherein the first locking pin ( 225 ) and the second locking pin ( 230 ) are configured to engage with the toothed rack ( 220 ) when the sled ( 210 ) is in the forwarded position relative to the loading ramp ( 10 ), and configured to disengage from the toothed rack ( 220 ) upon receipt of an activation or wakeup signal from the first sensor unit ( 240 ), wherein the first locking pin ( 225 ), or the second locking pin ( 230 ) or both the first locking pin and the second locking pin are engaged with, disengaged from, or both engaged with and disengaged from the toothed rack ( 220 ) by the aid of said at least one piston ( 227 , 228 ); wherein the second locking pin ( 230 ) is an elongate rod ( 233 ) with a first end pivotably connected to an elongate member ( 232 ) that is pivotably connected to the at least one piston ( 228 ); wherein a second end of the elongate rod is shaped to fit between two neighboring teeth of the toothed rack ( 220 ); and wherein the elongate rod ( 233 ) runs in a channel ( 231 ) formed in the sled ( 210 ).

5. A system for preventing semitrailer collisions with a loading ramp ( 10 ) comprising:

a guide block ( 200 ) positioned on a ground surface, laterally and/or medially to an opening of the loading ramp ( 10 ); wherein the guide block ( 200 ) comprises a first wheel blocking means configured as a sled ( 210 ) adapted for supporting treads of a rear tire ( 16 ) of a semitrailer ( 12 ), and configured to move passively from a forwarded position relative to the loading ramp ( 10 ) to a retracted position relative to the loading ramp ( 10 ) when pushed by the rear tire as the semitrailer ( 12 ) is reversing towards the loading ramp ( 10 );

a first sensor unit ( 240 ) configured for sensing when a rear end of the semitrailer ( 12 ) is approaching the guide block ( 200 );

a second sensor unit ( 100 ) configured for sensing when the rear end of the semitrailer ( 12 ) is approaching the loading ramp ( 10 ); wherein the second sensor unit ( 100 ) is configured to send a blocking signal to the guide block ( 200 ) when a distance between the rear end of the semitrailer ( 12 ) and the loading ramp ( 10 ) is below a preset threshold, thereby blocking movement of the sled ( 210 );

a third sensor unit ( 250 ), configured for sensing when an object is positioned in an area bounded by the guide block ( 200 ) and the loading ramp ( 10 ); wherein the third sensor unit ( 250 ) is configured to send a blocking signal to the guide block ( 200 ) when the object is positioned in the area bounded by the guide block ( 200 ) and the loading ramp ( 10 ), wherein the first wheel blocking means locks in position in response to the blocking signal, thereby blocking the movement of the sled ( 210 );

wherein the first sensor unit ( 240 ) is configured to send an activation or wakeup signal to the third sensor unit ( 250 ) when the rear end of the semitrailer ( 12 ) is sensed approaching the guide block ( 200 ), the system further comprising

a locking system adapted to retain and release the sled ( 210 ); wherein the locking system comprises a locking pin, and an anchor ( 520 ) positioned below said sled ( 210 ); wherein the locking pin is pivotably attached to the bottom side of said sled ( 210 ); wherein the locking pin comprises a first end ( 512 ) adapted for moving from an extended position on a top side of the sled ( 210 ) through a hole in said sled ( 210 ) to a retracted position within said hole; and a second end ( 514 ) adapted for moving from an extended position on the bottom side of said sled ( 210 ) to a retracted position also on the bottom side of said sled ( 210 ); wherein the second end ( 514 ) of said locking pin is adapted to be engaged in the retracted position with said anchor ( 520 ).