Window operators
OwnerGuy Simon Dawsoninventor
Life of this patent
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Abstract
A window operator for the opening and closing of a hinged window. The window operator has a rotatable lead screw 16 on which moves a slider 19. A driving element 18 is threaded on to the lead screw 16 and is coupled to the slider 19. A lost motion mechanism is operable upon the sliding movement of the slider being inhibited at final closing or initial opening of the window. The lost motion mechanism includes a tab 42 engaged in a helical slot 43. Movement of the tab in the helical slot causes an angular displacement of the driving element 18. A retention member 47 is moveable in response to the angular displacement and retains the slider 19 against movement while the driving element 18 continues to move along the lead screw. The tab 42 is thus moveable along slot 49 to operate a multipoint locking mechanism L.
Claims20
A lost motion mechanism including a driving element coupled with a driven element, a displacement arrangement to cause an angular displacement of the driving element, a retention member moveable, in response to said angular displacement, to a retention position to retain said driven element against movement and a guide to guide movement of the driving element relative to said driven element, the driving element being coupled to an engagement element which is operatively engageable with a drive bar of a multi-point lock mechanism to controllably move said drive bar.
A window operator including an elongate housing, a lead screw located within the housing and rotatable about a longitudinal axis, a slider and part of which is slidingly engaged with the elongate housing, a driving element threaded onto the lead screw and coupled to the slider to transfer rotation of the lead screw into a sliding movement of the slider, a lost motion mechanism operable upon the sliding movement of the slider being inhibited said lost motion mechanism including a displacement arrangement to cause an angular displacement of the driving element relative to the slide, a retention member moveable in response to said angular displacement to and from a retention position and a guide to guide movement of the driving element relative to the driven element when the retention member is in the retention position, the driving element having a coupling element which in use is operatively engageable with the drive bar of a multi-point lock mechanism.
Dependencies are inferred from the claim text.