Abstract: A clutch assembly for a roller door operator, the clutch assembly providing selective engagement with a drive wheel, the clutch assembly comprising: a rotatable shaft rotatable relative to the drive wheel; a clutch disc supported in a clutch lever and arranged to rotate with the rotatable shaft, the clutch disc and clutch lever configured to rotate relative to one another around the axis of rotation of the shaft; and a clutch cam supported in a clutch base, the clutch base configured to permit operative rotation of the clutch cam around the axis of rotation of the shaft in a first direction; wherein the clutch lever is operatively associated with the clutch cam so that rotational movement of the clutch lever in a second direction opposite to the first direction actuates movement of the clutch disc and the clutch lever axially along the rotatable shaft to engage or disengage the clutch disc with the drive wheel, and subsequent rotational movement of the clutch lever in the first direction actuates rotational m

Abstract: A clutch assembly for a roller door operator, the clutch assembly providing selective engagement with a drive wheel, the clutch assembly comprising: a rotatable shaft rotatable relative to the drive wheel; a clutch disc supported in a clutch lever and arranged to rotate with the rotatable shaft, the clutch disc and clutch lever configured to rotate relative to one another around the axis of rotation of the shaft; and a clutch cam supported in a clutch base, the clutch base configured to permit operative rotation of the clutch cam around the axis of rotation of the shaft in a first direction; wherein the clutch lever is operatively associated with the clutch cam so that rotational movement of the clutch lever in a second direction opposite to the first direction actuates movement of the clutch disc and the clutch lever axially along the rotatable shaft to engage or disengage the clutch disc with the drive wheel, and subsequent rotational movement of the clutch lever in the first direction actuates rotational m

Abstract: A clutch assembly for a roller door operator, the clutch assembly providing selective engagement with a drive wheel, the clutch assembly comprising: a rotatable shaft rotatable relative to the drive wheel; a clutch disc supported in a clutch lever and arranged to rotate with the rotatable shaft, the clutch disc and clutch lever configured to rotate relative to one another around the axis of rotation of the shaft; and a clutch cam supported in a clutch base, the clutch base configured to permit operative rotation of the clutch cam around the axis of rotation of the shaft in a first direction; wherein the clutch lever is operatively associated with the clutch cam so that rotational movement of the clutch lever in a second direction opposite to the first direction actuates movement of the clutch disc and the clutch lever axially along the rotatable shaft to engage or disengage the clutch disc with the drive wheel, and subsequent rotational movement of the clutch lever in the first direction actuates rotational m

Abstract: A clutch assembly for a roller door operator, the clutch assembly providing selective engagement with a drive wheel, the clutch assembly comprising: a rotatable shaft rotatable relative to the drive wheel; a clutch disc supported in a clutch lever and arranged to rotate with the rotatable shaft, the clutch disc and clutch lever configured to rotate relative to one another around the axis of rotation of the shaft; and a clutch cam supported in a clutch base, the clutch base configured to permit operative rotation of the clutch cam around the axis of rotation of the shaft in a first direction; wherein the clutch lever is operatively associated with the clutch cam so that rotational movement of the clutch lever in a second direction opposite to the first direction actuates movement of the clutch disc and the clutch lever axially along the rotatable shaft to engage or disengage the clutch disc with the drive wheel, and subsequent rotational movement of the clutch lever in the first direction actuates rotational m

Abstract: A clutch assembly for a roller door operator, the clutch assembly providing selective engagement with a drive wheel, the clutch assembly comprising: a rotatable shaft rotatable relative to the drive wheel; a clutch disc supported in a clutch lever and arranged to rotate with the rotatable shaft, the clutch disc and clutch lever configured to rotate relative to one another around the axis of rotation of the shaft; and a clutch cam supported in a clutch base, the clutch base configured to permit operative rotation of the clutch cam around the axis of rotation of the shaft in a first direction; wherein the clutch lever is operatively associated with the clutch cam so that rotational movement of the clutch lever in a second direction opposite to the first direction actuates movement of the clutch disc and the clutch lever axially along the rotatable shaft to engage or disengage the clutch disc with the drive wheel, and subsequent rotational movement of the clutch lever in the first direction actuates rotational m

Abstract: The invention relates to a clutch assembly (8) for providing selective engagement with a rotatable shaft, in particular for selecting between manual and powered driving of an output drive such as a door, shutter or gate. The clutch assembly (8) comprises a stop (16) arranged to rotate with the shaft (18), a cam (20) arranged to move relative to the shaft (18), and a follower (24) arranged to rotate around the shaft (18) and axially movable along the shaft in and out of engagement with the stop (16). The follower (24) is operatively associated with the cam (20) so that movement of the follower relative to the cam brings the follower into engagement with the stop (16) by axial movement, so causing rotation of the shaft (18).

Abstract: Drive assembly for a door, gate or barrier, having a rail or track, a trolley for connection to the door, gate or barrier, mountable to run along the rail or track, and a longitudinal drive having a chain or belt connectable in a closed loop arrangement around or within the rail or track. The trolley is provided with an engagement mechanism for selective engagement between the trolley and the longitudinal drive mechanism, whereby the engagement mechanism includes an engagement member arranged for selective movement in a direction substantially transverse to the longitudinal direction of the longitudinal drive and in a direction less than 45° from the plane of the loop of the longitudinal drive. The engagement member includes or cooperates with a cam part arranged for selective rotation about the engagement member, and a camming cooperation occurs between the cam part and the trolley body for converting rotation of the cam part about the engagement member into the required movement of the engagement member.

Abstract: The invention relates to a clutch assembly (8) for providing selective engagement with a rotatable shaft, in particular for selecting between manual and powered driving of an output drive such as a door, shutter or gate. The clutch assembly (8) comprises a stop (16) arranged to rotate with the shaft (18), a cam (20) arranged to move relative to the shaft (18), and a follower (24) arranged to rotate around the shaft (18) and axially movable along the shaft in and out of engagement with the stop (16). The follower (24) is operatively associated with the cam (20) so that movement of the follower relative to the cam brings the follower into engagement with the stop (16) by axial movement, so causing rotation of the shaft (18).

Abstract: A device for monitoring motion of a movable closure arranged for travel between limit positions, comprising an absolute position encoder for identifying whether the closure is in one of a plurality of sectors of travel, a relative position encoder for monitoring the speed and relative position of the closure, and a drive means for operatively coupling the relative position encoder and the absolute position encoder to the closure, such that there is a fixed relationship between motion of the closure and movement of both encoders, wherein the absolute position encoder features an adjustment assembly comprising a first element and a second element, the first element being selectively adjustable in position relative to the second element to adjust the absolute position encoder without movement of the drive means or the relative position encoder.

Abstract: The present invention relates to drive assemblies, and particularly to drive belt and drive chain assemblies for operation of doors, gates or barriers. The invention provides a connection for a flexible toothed belt or similar, including a body having an internal recess with a shaping complementary to that of the toothed belt, configured to allow an end portion of the belt to be engaged therein in a direction transverse to the belt longitudinal direction, so to retain the belt against disengagement in the longitudinal direction.

Abstract: A device for monitoring motion of a movable closure arranged for travel between limit positions, comprising an absolute position encoder for identifying whether the closure is in one of a plurality of sectors of travel, a relative position encoder for monitoring the speed and relative position of the closure, and a drive means for operatively coupling the relative position encoder and the absolute position encoder to the closure, such that there is a fixed relationship between motion of the closure and movement of both encoders, wherein the absolute position encoder features an adjustment assembly comprising a first element and a second element, the first element being selectively adjustable in position relative to the second element to adjust the absolute position encoder without movement of the drive means or the relative position encoder.