GB2099898A

GB2099898A - Door assembly

Info

Publication number: GB2099898A
Application number: GB8213621A
Authority: GB
Original assignee: REDGWICK ANTHONY JAMES
Current assignee: REDGWICK ANTHONY JAMES
Priority date: 1981-05-22
Filing date: 1982-05-11
Publication date: 1982-12-15
Also published as: GB2099898B

Abstract

A door assembly for horizontal surfaces e.g. cellar doors wherein the door(s) 12 lie flush with the frame 10 when closed and open up through an angle of greater than 90 DEG and means e.g. a boltable hinge arrangement are provided to lock the door(s) in an open position. The boltable hinge arrangement is also claimed. <IMAGE>

Description

SPECIFICATION Improvements in or relating to door assemblies The invention relates to a door assembly, particularly an assembly comprising at least one door which when in a normal closed position provided in a horizontal surface, for example in a pavement, may be wailed over as part of the pavement, and which when open allows access to a cellar or the like.

Conventional cellar doors usually consist of a wooden door which is hinged at one side and which may be opened so that the door leans back against a wall or folded back over the pavement to give access to the cellar. It is a problem which such doors that the door may be blown or knocked shut accidentally causing possible injury to persons using the access at the time.

The invention provides therefore a door assembly adapted to locate in a substantially horizontally disposed opening in a fixture, said assembly comprising a frame to define a periphery of the opening, at least one door, means for pivotally mounting the door relative to the frame for movement between a closed position wherein the door is substantially coplanar with the frame and an open position removed by an angle of greater than 900 from the closed position and retaining means co-operable with the frame to retain the door in said open position.

Preferably said retaining means is arranged to be operable to secure the or each door in the said closed position. Desirably the retaining means comprises a bolt on the or each door, said bolt being slidable to engage with an upper surface of said frame when the door is in said open position and slidable into an aperture in said frame when the door is in said closed position. The or each bolt is preferably provided with a handle enabling it to be easily advanced or retracted. Preferably the or each bolt is slidably mounted in a respective collar fixed to the or each door. Desirably an abutment is provided on the or each door to prevent withdrawal of the bolt from its respective collar.

The invention also provides a hinge for a cellar door said hing comprising a first plate for attachment to a door, a second plate for attachment to a door frame, said first and second plates being pivotally attached to the other by means of a pivot, and fixing means provided on the first or second plates, or both, operable to secure the first plate with respect to the second plate in one or more positions.

Preferably the first and second plates lie substantially parallel to one another and the pivot extends normally through said plates. The fixing means preferably comprise a metal pin insertable through a corresponding pair of holes in the first and second plates when the hinge is in a closed position, and insertable through a hole in the first plate to abut a frame to which the second plate is, in use, attached when the hinge is in an open position. Desirably the hinge is povitable through an angle of greater than 900, preferably 1050, from its open to its closed position.

The invention will now be described by way of example only with reference to the accompanying drawings in which: Fig. 1 is a perspective view of a cellar door according to the invention; Fig. 2 is a plan view of the cellar door of Fig.1, Fig. 3 is a cross-sectional view on line A-A of Fig. 2 showing the door in a- closed position; Fig. 4 is a cross-sectional view on line A-A with the door shown in an open position: Fig. 5 is a cross-sectional view on line B-B showing the door in a closed position; and Fig. 6 is a cross-sectional view on line B-B showing the door in an open position.

Fig. 1 shows a cellar door assembly comprising a frame 10 which is, in use, fitted into surrounding masonry, and has pivotally attached thereto a pair of cellar doors 12 one of which is shown open and the other closed in Fig. 1. Each door 12 is preferably made from steel and is provided with a series of reinforcing ribs 14. Peripheral side margins of each door 12 rest, when closed, on ledges 1 6 provided at each side of the frame 10.

Each door 12 is mounted at corners of the frame 10 by means of hinges 20 as shown in Figures 4 to 6.

Each hinge 20 comprises a pair of steel plates 22. 24 (see Fig. 5) the plate 22 being welded to an edge of the door 12 and the plate 24 being welded to a peripheral margin of the frame 10.

The plates 22, 24 are connected by a pivot bolt 25 and have respective apertures 23, 26. The plate 22 is additionally provided with a cylindrical collar 22a, the bore of which is aligned with the aperture 23 in the plate 22 and is aligned with the aperture 26 in the plate 24 when the cellar door is closed as shown in Fig. 5. A securing bolt 27 is provided and by inserting the bolt through the collar 22a and the aligned apertures in the plates 22, 24 when the door is in the closed position, the door can be locked in this position. When the door is in the open position as shown in Fig. 6 the securing bolt 27, extending through the collar 22a and the aperture in the plate 22, is able to abut an upper surface of the frame 10 to lock the door in the open position.

An angled strip 28 (see Fig. 3) which is welded to a back edge of each door 12 abuts the frame 10 when the door is in the closed position so helping to minimise penetration by moisture. When the door is in the open position the door opens through an angle greater than 900 and is held in this position by abutment with part of the frame 10 part 1 Oa of the door.

The frame 10 is fixed into surrounding masonry by means of concrete, and key strips 30 are provided to ensure good securement of the frame within the masonry. An abutment 32 is provided behind each bolt 25 to prevent the bolt 25 disengaging from the collar 22a and also to provide some protection against damage to the hinge assembly by heavy items passing through the doors. A keying recess 34 is also provided in one of the doors 12 so that a finger or an L-shaped key can be inserted therein to grip the door during opening. The doors and hinge parts are preferably made from steel but may be made in whole or in part from plastics material. Upper surfaces of the doors and frame are preferably ribbed or otherwise textured to inhibit slipping of pedestrians' feet.

Claims

1. A door assembly adapted to locate in a substantially horizontally disposal opening in a fixture, said assembly comprising a frame to define a periphery of the opening, at least one door, means for pivotally mounting the door relative to the frame for movement between a closed position wherein the door is substantially coplanar with the frame and an open position removed by an angle of greater than 900 from the closed position and retaining means co-operable with the frame to retain the door in said open position.

2. A door assembly as claimed in claim 1 in which the retaining means is arranged to be operable to secure the or each door in said closed position.

3. A door assembly as claimed in claim 2 in which the retaining means comprises a bolt on the or each door, said bolt being slidable to engage with an upper surface of said frame when the door is in said open position and slidable into an aperture in said frame when the door is in said closed position.

4. A door assembly as claimed in claim 3 in which said bolt is provided with a handle enabling it to be easily advanced or retracted.

5. A door assembly as claimed in claim 3 or claim 4 in which the or each bolt is slidably mounted in a respective collar fixed to the or each door.

6. A door assembly as claimed in claim 5 in which an abutment is provided on the or each door to prevent withdrawal of the bolt from its respective collar on the or each door.

7. A hinge for a cellar door, said hinge comprising a first plate for attachment to the door, a second plate for attachment to a frame of the door, said first and second plates being pivotally attached one to the other by means of a pivot, and fixing means provided on the first or second plates or both and operable to secure the first plate with respect to the second plate in one or more positions.

8. A hinge as claimed in claim 7 in which said first and second plates lie substantially parallel to one another and the pivot extends normally through said plates.

9. A hinge as claimed in either of claims 7 or 8 in which said fixing means preferably comprise a metal pin insertable through a corresponding pair of holes in the first and second plates when the hinge is in a closed position and insertable through a hole in the first plate to abut a frame to which the second plate is, in use attached, when the hinge is in an open position.

10. A hinge substantially as hereinbefore described with reference to the accompanying drawings.

11. A door assembly substantially as hereinbefore described with reference to the accompanying drawings.