Device for transmitting a drive force between a flexible element and a rotatable body
AssigneeSchon B.V.
InventorSiegfried J. Schon
Life of this patent
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Abstract
A device for transmitting a drive force between a flexible element, such as cord, and a first rotatable, cylindrical body, said flexible element is trained around the casing surface of the body through a pre-determined angle, wherein a second cylindrical body is arranged with a rotating shaft parallel to that of the first, along which the flexible element is trained in opposing direction, said both bodies, preferably provided with at least one groove for receiving said flexible element, are embodied and/or placed such that the bodies rotate without slippage between flexible element and both cylindrical bodies.
Claims32
Device for transmitting a drive force between a flexible element and a first rotatable cylindrical body, wherein the flexible element is trained through a pre-determined angle about the first cylindrical body in one direction, characterized in that a second cylindrical body is arranged in parallel to the first cylindrical body and around which the flexible element is trained in an opposite direction, wherein both cylindrical bodies are placed such that the bodies rotate without slippage relative to the flexible element and the cylindrical bodies clamp the flexible element therebetween.
A liftable blind assembly for selectively opening and closing a generally rectangular opening having left and right sides, said assembly comprising a movable beam, having left and right ends, at least one flexible drive element arranged in a continuous loop and engaging said movable beam, a drive roll arrangement including at least first, second and third drive rolls, said rolls rotating in alternately opposite rotational senses, first guides at left and right top corners of the opening, second guides disposed adjacent left and right bottom corners of the opening, the continuous loop including a first run, which operatively engages the right end of the movable beam, passes under the second guide at the right bottom corner of the opening, over the first guide at the right top corner of the opening under the first roll, over the second roll, under the third roll over the first guide at the left top corner of the opening and operatively engages the left end of the movable beam and wherein the continuous loop includes a second run which operatively engages the left end of the movable beam, passes under the second guide at the left bottom corner of the opening, over the first guide at the left top corner of the opening, over the third roll, under the second roll, over the first roll, over the first guide at the right top corner of the opening and operatively engages the right end of the movable beam, wherein said drive element is in frictional contact with peripheral surface portions of said drive rolls over subtending angles totalling at least 360 degrees.
A liftable blind assembly for selectively closing a generally rectangular opening having left and right sides, said assembly comprising a movable beam, having left and right ends, at least one flexible drive element arranged in a continuous loop and engaging said movable beam, a drive roll arrangement including at least first, second and third drive rolls, peripheral gear teeth on said rolls which operatively engage one another to cause said rolls to positively be driven in alternately opposite rotational senses, first guides at left and right top corner of the opening, second guides disposed adjacent left and right bottom corner of the opening, the continuous loop including a first run, which operatively engages the right end of the movable beam, passes under the second guide at the right bottom corner of the opening, over the first guide at the right top corner of the opening, under or over the first roll, over or under the second roll and then under or over the third roll, to be engaged by the teeth on said rolls, over the first guides at the left top corner of the opening and operatively engages the left end of the movable beam and wherein the continuous loop includes a second run which operatively engages the left end of the movable beams, passes under the second guide at the bottom left corner of the opening, over the first guide at the left top corner of the opening, over the first guide at the right top corner of the opening and operatively engages the right end of the movable beam.
Blind assembly for selectively opening and closing an opening comprising a rotatable drive body for transmitting a drive force to a movable beam, wherein a flexible drive element is arranged in a continuous loop engaging the movable beam so as to open and close said opening upon rotation of said rotatable drive body, characterized in that said continuous loop includes a first run and a second run each engaging opposite ends of said movable beam and wherein said first and second runs are each resiliently closed, wherein the rotatable drive body is in the form of a first cylindrical roll, around which the flexible drive element is trained through a predetermined angle around a peripheral surface of the first cylindrical roll, further comprising a second rotatable roll arranged with its axis of rotation parallel to that of the first roll and around which second roll the flexible element is trained in an opposing curve and wherein both first and second rolls are positioned such that they clamp the flexible drive-element therebetween and rotate without slippage between the flexible element and both rolls.
Blind assembly for selectively opening and closing an opening comprising a rotatable drive body for transmitting a drive force to a movable beam, wherein a flexible drive element is arranged in a continuous loop engaging the movable beam, so as to open and close said opening upon rotation of said rotatable drive body, characterized in that said continuous loop includes a first run and a second run each engaging opposite ends of said movable beam and wherein said first and second runs are each resiliently closed, wherein the rotatable drive body is in the form of a first cylindrical roll, around which the flexible drive element is trained through a predetermined angle around a peripheral surface of the first cylindrical roll, further comprising a second rotatable roll arranged with its axis of rotation parallel to that of the first roll and around which second roll the flexible element is trained in an opposing curve and wherein both first and second rolls are positioned such that they rotate without slippage between the flexible element and both rolls, wherein said first and second rolls comprise peripheral gear teeth which operatively engage one another to cause said adjacent drive rolls to be positively driven in opposite rotational senses.
Dependencies are inferred from the claim text.