GB2187780A

GB2187780A - Improvements in fly doors

Info

Publication number: GB2187780A
Application number: GB08606182A
Authority: GB
Inventors: Anthony John Sparrow
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-03-13
Filing date: 1986-03-13
Publication date: 1987-09-16
Also published as: GB8606182D0

Abstract

A fly door comprises a rectangular frame (10) preferably of "U" section extruded aluminium, with at least one side detachable from the rest of the frame to enable insertion of a mesh panel 28 carried by an edge support 30 into guide means formed on the inside of the frame. The door can be divided by an "H" section bar 16 and be suspended by inverted cups C which drop over hinge pins mounted outside the door opening. <IMAGE>

Description

SPECIFICATION Improvements in fly doors This invention relates to a fly door, which term as used herein means a door having a substantial part of its area formed by a mesh or the like, so that when closed the door is capable of passing air but is nevertheless effective to prevent passage of flies or other insects.

Commonly used fly doors comprise a surrounding frame to which a wire mesh is attached by nails or other suitable fasteners. It is an object of this invention to provide an improved construction of fly door.

According to the invention, a fly door comprises a rectangular frame having at least one side detachably securable to the rest of the frame, said frame being internally formed with guide means for receiving one or more mesh panels wherein the mesh is carried by an edge support which enables the mesh panel or panels to be slidably fitted in the frame when the at least one side of the latter is detached.

In a preferred arrangement, the door frame is of a channel section which defines opposed inwardly facing channels between which the mesh panel or panels is or are slidably received.

Conventionally, a fly door fits on the exterior of a door opening to the outside of a room or building and opens outwardly. Its interior face seats against the outside of the door opening and desirably this closure is also required to exclude passage of insects. It is therefore important for a fly door to be highly resistant to warp which would prevent it seating all round closely to the outside of the door opening, and for this reason a preferred door has a frame made of extruded metal section, preferably aluminium section.

Conventionally also, a fly door is readily detachable at its hinges, since it normally fits outside the permanent door in the door opening and can be removed when it is not required for use, e.g. in the cold weather season. The preferred door in accordance with the present invention is provided with inverted cup fittings at one side, which drop over hinge pins mounted on the outside of the door opening. Closure is preferably maintained by a door closer, which in the preferred door of this invention is a spring loaded arm detachably mounted to a supporting fitting on the outside of the door opening and having a roller at the end remote from its pivotal mounting which bears against and rolls across the face of the door to maintain closure of the latter.

The preferred construction of door comprises four straight channel sections which detachably secure together at the corners by means of internal L-shaped strip brackets which receive countersunk set screws received from the exterior through apertures in the base walls of adjacent channel sections. In addition, the door frame has a transverse bar at an intermediate position in its height, of elongated H-shaped transverse cross-section providing upwardly and downwardly facing channels. Two mesh panels fit slidably into the preferred frame, one above and one below the intermediate bar. The intermediate bar may be fixed in position by cleats.

Each preferred mesh panel has a surround, preferably of moulded plastics material such as fibreglass or UPVC, which surround has a central slot within which the edge of an aluminium mesh is suspended. The mesh may be, for example, 31 gauge mesh having approximately 7 squares per cm (10 squares per inch) pitch. The surround may conveniently be formed at the side of the central slot with rounded lips which form a weather bead against each face of the mesh. The underside of the lips may form a stop beyond which the surround is shaped to be slidingly received in the channels of the frame.

The door closer preferably acts on the intermediate bar, generally at the same level as the intermediate cup of three hinge cups.

A practical example of the fly door in accordance with the invention is illustrated in the accompanying drawings, in which: Figure 1 shows the door in side elevation; Figure 2 illustrates in enlarged exploded view the manner in which the door frame sections are fitted together; Figures 3A and 3B show in enlargement, the cross-sectional shapes of the intermediate bar and the door frame sections; Figures 4A and 4B show in enlargement the manner in which the intermediate bar is fixed in position, in conjunction with a handgrip fitting; Figure 5 shows a mesh panel; Figure 6 is a reduced cross-section through the mesh panel; and Figure 7 shows a preferred alternative cross-section through the mesh panel; and Figure 7 shows a preferred alternative cross-section for the mesh panel surround.

The exemplified fly door comprises an extruded aluminium frame 10 of channel shaped cross-section shown in Fig. 3B, made up of four elongate sections which fit together by means of internal L-shaped strip brackets 12 and set screws 14, as illustrated in Fig. 2.

The door has an intermediate bar 16 also of extruded aluminium, generally of H-shaped cross section (Fig. 3A), which fits to opposed side sections of the frame by means of a cleat 18 and set screw 20, as shown in Fig.

4A. A hand grip 22 fits by means of set screws 24 to the intermediate bar 16, in line with one of the cleats 18 (see Fig. 4B).

With first one and then the other of the upper and lower sections of the frame detached, the mesh panel 26 shown in Fig. 5 slidably fits into the internal channels defined by the frame and intermediate bar. The mesh panel is of aluminium 31 gauge mesh reference 28 fitted into a shaped surround 30 of moulded plastics material. The cross-sectional shape of this surround 30 is clear from Fig. 6, including a slot 32 within which the edge of the mesh is suspended. An alternative crosssectional shape for the surround within which the mesh is suspended is shown in Fig. 7, wherein the surround is shaped with rounded lips 34 forming a weather bead, the underside of the lips constituting a stop and the surround being shaped at 36 beyond the stop for sliding engagement in the door frame channels.

The exemplified fly door shown in and described with reference to the drawings may be modified in various ways within the scope of the invention as hereinbefore defined.

Claims

1. A fly door comprising a rectangular frame having at least one side detachably securable to the rest of the frame, said frame being internally formed with guide means for receiving one or more mesh panels wherein the mesh is carried by an edge support which enables the mesh panel or panels to be slidably fitted in the frame when the at least one side of the latter is detached.

2. A fly door according to claim 1, wherein the door frame is of a channel section which defines opposed inwardly facing channels between which the mesh panel or panels is or are slidably received.

3. A fly door according to claim 1, wherein the frame of the door is made of extruded metal section.

4. A fly door according to claim 3, wherein the metal is aluminium.

5. A fly door according to any of claims 1 to 4, having inverted cup fittings at one side for dropping over hinge pins mounted on the outside of the door opening.

6. A fly door according to any of claims 1 to 5, equipped with a door closer.

7. A fly door according to claim 6, wherein the door closer is a spring loaded arm detachably mounted to a supporting fitting on the outside of the door opening and having a roller at the end remote from its pivotal mounting which bears against and rolls across the face of the door to maintain closure of the latter.

8. A fly door according to any of claims 1 to 7, comprising four straight channel sections which detachably secure together at the corners by means of an internal L-shaped strip brackets which receive countersunk set screws received from the exterior through apertures in the base walls of adjacent channel sections.

9. A fly door according to claim 8, also having a transverse bar at an intermediate position in its height, of elongated H-shaped transverse cross-section providing upwardly and downwardly facing channels.

10. A fly door according to claim 9, wherein the intermediate bar is fixed in position by cleats.

11. A fly door according to claim 9 or claim 10, wherein two mesh panels fit slidably into the preferred frame, one above and one below the intermediate bar.

12. A fly door according to claim 11, wherein each mesh panel has a surround of moulded plastics material, which surround has a central slot in which a mesh is suspended.

13. A fly door according to claim 12, wherein the surround is formed at the side of the central slot with lips which form a weather bead against each face of the mesh, and also form a stop beyond which the surround is shaped to be slidingly received in the channels of the frame.

14. A fly door according to any of claims 1 to 13, wherein the door mesh has approximately 7 squares per cm.

15. A fy door substantially as hereinbefore described with reference to the accompanying drawings.