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US 8,881,461 B2Granted
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.
Claims50
A restrictor, comprising:
- a housing;
- a tab pivotally mounted on the housing;
- a pushing element;
- and
- a restraining element,
- the tab comprising a first arm and a second arm,
- the tab being pivotally movable relative to the housing between:
- at least a first pivot position, in which the restraining element is in a disengaged arrangement and at least a portion of the first arm is on a first side of a first plane and an entirety of the second arm is on a second side of the first plane, and
- a second pivot position, in which:
- the restraining element is engaged, and the restraining element prevents the tab from pivoting,
- an entirety of the first arm is on the second side of the first plane,
- at least a portion of the second arm is on the first side of the first plane, and
- at least a portion of the second arm protrudes from the housing,
- the pushing element biasing the tab to pivot toward the first pivot position,
- with the restraining element engaged, the restraining element can be disengaged by pressing the second arm, such that the pushing element causes the tab to pivot toward the first pivot position.
12 more elements
A restrictor, comprising:
- a housing;
- a tab pivotally mounted on the housing;
- a pushing element;
- and
- a restraining element,
- the tab being pivotally movable relative to the housing between at least:
- a first pivot position, and
- a second pivot position in which the restrictor is in an engaged arrangement, in which the pushing element biases the tab to pivot away from the second pivot position toward the first pivot position and the restraining element prevents the tab from being pivoted by the bias of the pushing element, and
- a third pivot position in which the restraining element is in a disengaged arrangement, in which the restraining element does not prevent the pushing element from pivoting the tab,
- contacting the tab with a substantially fiat surface of a structure by moving the substantially flat surface of the structure along a first plane defined by the substantially flat surface can cause the restraining element to be automatically changed from the engaged arrangement to the disengaged arrangement.
7 more elements
A sliding system, comprising:
- at least a first member and a second member,
- at least the first member being movable relative to the second member between at least a first closed position and at least a first open position, and
- a restrictor,
- the first member having a first surface substantially aligned in a first plane, the second member having a second surface substantially aligned in a second plane, the second plane being substantially parallel to the first plane,
- the restrictor comprising a housing, a tab, a pushing element and a restraining element, the tab being pivotally movable relative to the housing between at least:
- a first pivot position in which the tab prevents movement of the first member relative to the second member from the first closed position beyond a first relative position, and
- a second pivot position in which a portion of the tab is at least partially retracted into the housing from the first pivot position, the pushing element biases the tab to pivot away from the second pivot position toward the first pivot position and the restraining element is in an engaged arrangement in which the restraining element prevents the tab from being pivoted by the bias of the pushing element,
- movement of the first member from the first closed position, with the restraining element in the engaged arrangement, to the first open position resulting in the first member contacting the tab and causing the restraining element to automatically change to a disengaged arrangement in which the restraining element does not prevent the tab from pivoting by the bias of the pushing element.
5 more elements
A restrictor, comprising:
- a housing;
- a tab;
- a pushing element;
- a restraining element;
- and
- means for selectively preventing movement of a first member that has a first surface substantially aligned in a first plane, relative to a second member that has a second surface substantially aligned in a second plane, the second plane being substantially parallel to the first plane,
- movement of the first member in a direction parallel to the first plane causes the first member to contact the tab to disengage the restraining element which, when engaged, prevents the pushing element from pivoting the tab.
4 more elements
A restrictor, comprising:
- a housing;
- a tab pivotally mounted on the housing, the tab pivotable among a first pivot position, a second pivot position and a third pivot position;
- means for biasing the tab to pivot from the second pivot position toward the first pivot position;
- and
- means for selectively preventing the tab from pivoting from the second pivot position toward the first pivot position,
- the means for selectively preventing the tab from pivoting in a disengaged arrangement when the tab is in the first pivot position,
- the means for selectively preventing the tab from pivoting in an engaged arrangement which prevents the means for biasing the tab from causing the tab to pivot toward the first pivot position, when the tab is in the second pivot position,
- the means for selectively preventing the tab from pivoting in a disengaged arrangement when the tab is in the third pivot position, and
- with the means for selectively preventing the tab from pivoting in an engaged arrangement, pressing the tab can disengage the means for selectively preventing the tab from pivoting.
6 more elements
A restrictor, comprising:
- a housing;
- a tab pivotally mounted on the housing;
- and
- a pushing element,
- the tab being pivotally movable relative to the housing between at least:
- a first pivot position, and
- a second pivot position in which the pushing element biases the tab to pivot away from the second pivot position toward the first pivot position and the tab is prevented from being pivoted by the bias of the pushing element, and
- a third pivot position in which no portion of the restrictor prevents the pushing element from pivoting the tab toward the first position,
- contacting the tab with a substantially flat surface of a structure by moving the substantially flat surface of the structure along a first plane defined by the substantially flat surface can cause the tab to be automatically changed from the second pivot position to the third pivot position.
6 more elements
Dependencies are inferred from the claim text.