Sash window restrictor
AssigneeMighton Products Limited
InventorMichael DERHAM
Life of this patent
Estimating the term…
Abstract
A sash window restrictor (20) has a housing (22) which is to be let into a vertical frame member (10) of one sash (normally the upper, outer sash) of a window, at a position, say, 10 cm above the top rail of the lower sash when the windows are closed. A tab (24) is mounted in the housing and can be retracted into the housing or extended from the housing. A mechanism acts between the tab and the housing and allows the tab to be pressed into the housing and held in the housing for a period of time before the tab is released to allow the tab to extend. With the tab extended, the lower sash (12) can be lifted until it reaches the tab (24) but no further, so that a 10 cm gap will be opened at the bottom of the window.
Claims21
A restrictor, comprising:
- a housing;
- a tab;
- at least a first magnet;
- and
- a spring,
- the tab is mounted to the housing pivotally relative to the housing about a first axis,
- the spring applies force tending to push the tab in a first rotational direction about the first axis,
- the tab is capable of being pushed in the first rotational direction about the first axis from a second tab position to a first tab position,
- the tab is prevented from being rotated in the first rotational direction beyond the first tab position,
- the tab is capable of being pushed in a second rotational direction from the first tab position to the second tab position,
- the tab is prevented from being rotated in the second rotational direction beyond the second tab position,
- with the tab in the second tab position, magnetic force exerted by the first magnet prevents the tab from being pushed out of the second tab position by the spring.
A restrictor, comprising:
- a housing;
- a tab;
- and
- a spring,
- the tab is mounted to the housing pivotally relative to the housing about a first axis,
- the spring applies force tending to push the tab in a first rotational direction about the first axis,
- the tab is capable of being pushed in the first rotational direction about the first axis from a second tab position to a first tab position,
- the tab is prevented from being rotated in the first rotational direction beyond the first tab position,
- the tab is capable of being pushed in a second rotational direction from the first tab position to the second tab position,
- the tab is prevented from being rotated in the second rotational direction beyond the second tab position,
- with the tab in the first tab position, a first surface of the tab is in contact with a first wall of the housing,
- with the tab in the second tab position, a second surface of the tab is in contact with the first wall of the housing, and
- with the tab in the third tab position, a third surface of the tab is substantially parallel to the first wall of the housing.
A restrictor, comprising:
- a housing;
- a tab;
- and
- a spring,
- the tab is mounted to the housing pivotally relative to the housing about a first axis,
- the spring applies force tending to push the tab in a first rotational direction about the first axis,
- the tab is capable of being pushed in the first rotational direction about the first axis from a second tab position to a first tab position,
- the tab is prevented from being rotated in the first rotational direction beyond the first tab position,
- the tab is capable of being pushed in a second rotational direction from the first tab position to the second tab position,
- the tab is prevented from being rotated in the second rotational direction beyond the second tab position,
- with the tab in the third tab position, a surface of the tab defines a first plane, and an entirety of the tab is to a first side of the first plane.
Dependencies are inferred from the claim text.