Safety device, particularly for roll-up doors

Claim 2

A safety device, particularly intended for use in a roll-up door, said roll-up door including a roll-up door leaf extending horizontally between two upright posts defining a width for said roll-up door, said roll-up door further including an upper cross beam onto and off of which said door leaf is wound to open and close said roll-up door, respectively, and a lower cross beam connected to a bottom edge of said door leaf, said bottom edge of said door leaf being adjacent to a plane base surface when said roll-up door is in a closed position, said safety device comprising at least one signal emitting means (7) which is arranged to emit a signalling beam across the width of the door-leaf at a distance below the lower cross beam on said bottom edge of the door-leaf so that any object, obstructing a movement of the roll-up door into said closed position, interrupts the signalling beam emitted by the signalling means and causes a stopping of the closing movement of the door-leaf before the bottom edge thereof hits said object, characterized therein that the signal emitting means (7) is mounted on a support arm (9) which is slideably mounted in a holder (8) mounted on said lower cross beam, said support arm (9) arranged to abut against said plane base surface upon closing of the door so that the signal emitting means are displaced relatively to and towards the door-leaf to a position at least in level with the bottom edge of said door-leaf during the final closing movement thereof.

Claim 3

A safety device as claimed in claim 1, characterized therein that the signal emitting means (7) are positioned in vertical alignment with the door-leaf.

Claim 4

A safety device as claimed in claim 1, characterized therein that the safety device (6) is arranged to be disconnected when the door reaches a position at a predetermined level above the closed ;

Claim 5

A safety device as claimed in claim 1, characterized therein that said signal emitting means are a photoelectric cell.

Claim 6

An improved safety device, particularly intended for use in roll-up doors of the kind comprising a door-leaf and an overhead roll-up roller, said door leaf arranged to be wound onto and off of said roll-up roller for opening and closing movements, respectively, said door-leaf extending horizontally between two upright posts defining a width for said roll-up door, said roll-up door further including a lower cross beam connected to a bottom edge of said door-leaf, said bottom edge of said door-leaf being adjacent to a plane base surface when said roll-up door is in a closed position, said safety device comprising at least one signal emitting means, said means arranged to emit a signalling beam across the width of said door-leaf at a distance below the lower cross beam on said bottom edge of said door-leaf so that any object obstructing a movement of said door into a closed position interrupts said signalling beam emitted by said signal emitting means and causes a stopping of said closing movement of said door-leaf before the bottom edge thereof hits said object, said improved safety device comprising: a support arm on which said signal emitting means is mounted; a holder mounted on said lower cross beam and slidingly receiving said support arm therein; said support arm arranged to abut against said plane base surface upon closing of said door so that said signal emitting means are displaced relatively to and towards said door-leaf to a position at least level with the bottom edge of said door-leaf during the final closing movement thereof.

Claim 7

An improved safety device, particularly intended for use in roll-up doors of the kind comprising a door-leaf and an overhead roll-up roller, said door leaf arranged to be wound onto and off of said roll-up roller for opening and closing movements, respectively, said door-leaf extending horizontally between two upright posts defining a width for said roll-up door, said roll-up door further including a lower cross beam connected to a bottom edge of said door-leaf, said bottom edge of said door-leaf being adjacent to a plane base surface when said roll-up door is in a closed position, said safety device comprising at least one signal emitting means, said means arranged to emit a signalling beam across the width of said door-leaf at a distance below the lower cross beam on said bottom edge of said door-leaf so that any object obstructing a movement of said door into a closed position interrupts said signalling beam emitted by said signal emitting means and causes a stopping of said closing movement of said door-leaf before the bottom edge thereof hits said object, said improved safety device comprising: a support arm on which said signal emitting means is mounted; a holder mounted on said lower cross beam and slidingly receiving said support arm therein; said support arm arranged to abut against said plane base surface upon closing of said door so that said signal emitting means are displaced relatively to and towards said door-leaf to a position at least level with the bottom edge of said door-leaf during the final closing movement thereof.

Claim 8

An improved safety device as claimed in claim 5, wherein said signal emitting means are positioned in vertical alignment with said door-leaf.

Claim 9

An improved safety device as claimed in claim 5 wherein said signal emitting means are a photoelectric cell.

Claim 10

An improved safety device as claimed in claim 5, wherein said safety device is arranged to be disconnected when said door reaches a position at a predetermined level above said closed position.