Movable or removable closures – With operator for movably mounted closure – Operating lever or link and closure swing about parallel axes
Reexamination Certificate
1999-09-09
2001-11-13
Strimbu, Gregory J. (Department: 3634)
Movable or removable closures
With operator for movably mounted closure
Operating lever or link and closure swing about parallel axes
C049S345000, C049S346000
Reexamination Certificate
active
06314681
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a window operator.
Typically a window operator will include a housing which incorporates a winding handle. The housing will be surface mounted on a window frame. The handle drives via gears a drive arm coupled to the window sash to be driven between open and closed positions in the frame by the operator.
Due to the use of gears, high loadings can during operation be applied to the drive arm. This is due to poor mechanical advantage when moving the window from a closed position and possibly when moving the sash from a fully open position. These loads, when initiating motion of the window can lead to wearing of the operator components, more particularly the gears and in extreme situations where stickion is a factor (eg when a window is being opened for the first time after a long period of inaction) breakage of components can occur.
Window operators are surface mounted to the window frame or surround. The window operator housing is thus readily apparent and can spoil the aesthetic appeal of the window frame/surround.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a window operator which exhibits good mechanical advantage when initiating motion of a window sash.
It is a further object of the present invention to provide a window operator whereby the mechanical operating elements to apply a driving force to the drive arm can be concealed within the window frame/surround.
Broadly, in one aspect of the invention there is provided a window operator including a mounting means, an elongate threaded member mounted with the mounting means, drive means to apply a rotational movement to the elongate member, a threaded element located on the elongate member, a drive arm pivotally coupled to the threaded element and a link pivotally coupled to the drive arm and adapted for coupling to a window sash.
In a preferred form of the invention the link is pivotally coupled to an arm which is pivotally coupled at one end to the mounting means and at another end is adapted for coupling to a window sash.
According to one form of the invention the drive arm is pivotally coupled to a second link which is adapted for pivotal coupling to a window sash.
The preferred form of the invention has the mounting means formed by an elongate plate which is engageable within a cavity in a window frame or surround.
Broadly in a second aspect of the invention there is provided a window operator including an elongate substantially flat mounting means, an elongate threaded member rotatably mounted on the mounting means, a drive means coupled to the elongate threaded member, a nut threaded on the threaded member, a drive arm coupled to the nut and an input shaft coupled to the drive means, the arrangement being such that the mounting is able to be located within a cavity in a window frame or surround with the input shaft projecting from the frame or surround and the drive arm extending from a part of the frame or surround at an opposite side to that from which the input shaft projects.
In a preferred form the input shaft is adapted for connection to a handle. The connection can be via a knuckle joint.
Preferably, the drive arm is adapted to couple to a sash and is pivotally connected to a first link which is pivotally connected to an arm, said arm being pivotally coupled to the mounting means and adapted at a distal end to be coupled to a window sash.
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Blakely & Sokoloff, Taylor & Zafman
Interlock Group Limited
Strimbu Gregory J.
LandOfFree
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