Molded plastic access door

Abstract

A molded access door assembly for an access opening in a wall or ceiling is provided. It includes a molded frame with a frame channel forming the outside of the access door assembly. The frame channel has spaced apart exterior and interior walls joined at the top edge by a top wall and a lip extending from the bottom edge of the inner wall into the interior of the molded access door assembly to define an opening. The lip provides a stop rest for the door in the closed position so that the door is capable of being attached to the wall or ceiling. The assembly also includes a door having a top surface and a first part of a hinge assembly along one edge of the top surface which cooperates with a matching second part of the hinge assembly along one edge of the frame channel to allow the door to move between an open and a closed position.

Claims

1. A molded access door assembly for an access opening in a wall or ceiling, the assembly comprising: (a) a molded frame including: an inner wall having an inner wall bottom edge for positioning against the wall or ceiling about the access opening, and an inner wall top edge spaced orthogonally away from the inner wall bottom edge, an outer wall spaced laterally outwardly from the inner wall, the outer wall having an outer wall bottom edge for positioning against the wall or ceiling about the access opening, and an outer wall top edge spaced orthogonally away from the outer wall bottom edge, a top wall extending between the inner wall top edge and the outer wall top edge, and a lip extending from the inner wall bottom edge to a lip inner edge spaced laterally inwardly from the inner wall bottom edge, the lip inner edge extending about a perimeter of a frame opening defined by the frame, the lip including a generally flat lip bottom surface for bearing against the wall or ceiling adjacent the access opening and a lip top surface opposite the lip bottom surface, the lip bottom surface and the outer wall bottom edge lying in a common bottom plane, the lip further including fastener holes passing through the lip bottom surface for receiving fasteners to secure the frame against the wall or ceiling, wherein each fastener hole is spaced laterally inwardly from the inner wall and a respective portion of the lip top surface extends laterally between each fastener hole and the inner wall; and (b) a molded door hingedly connected to the frame and movable between an open position providing access to the frame opening and the fastener holes and a closed position in which the door covers the frame opening and the fastener holes.

2. The assembly of claim 1 further comprising hinge pins protruding outwardly from opposing surfaces of the door, wherein the frame includes hinge pin receiving holes receiving the hinge pins to hingedly connect the door to the frame.

3. The assembly of claim 1, wherein the lip inner edge extends about an entirety of the perimeter of the frame opening.

4. The assembly of claim 1, wherein the lip is generally perpendicular to the inner wall.

5. The assembly of claim 1, wherein the lip has a lateral extent between the inner wall bottom edge and the lip inner edge, the lateral extent generally constant about the perimeter of the frame opening.

6. The assembly of claim 1, wherein the lip top surface provides a stop rest for the door when the door is in the closed position.

7. The assembly of claim 1, wherein the frame includes four corners where perpendicular sides of the frame intersect, and the lip extends generally continuously from one to another of the perpendicular sides through a respective corner.

8. The assembly of claim 7, wherein the frame includes four fastener holes, each of the four fastener holes adjacent a respective one of the four corners.

9. The assembly of claim 1, wherein the inner wall has an inner wall axial extent between the inner wall bottom edge and the inner wall top edge, and the outer wall has an outer wall axial extent between the outer wall bottom edge and the outer wall top edge, the inner wall axial extent generally equal to the outer wall axial extent.

10. The assembly of claim 1, wherein the lip is generally parallel to the top wall.

11. The assembly of claim 1, wherein the frame is bounded axially by the common bottom plane.

12. The assembly of claim 1, wherein the lip bottom surface extends continuously about an entirety of the frame opening.

13. The assembly of claim 1, wherein the lip bottom surface extends continuously from the inner wall bottom edge to the lip inner edge.

14. The assembly of claim 1, wherein the door includes a door top surface and the top wall includes a top wall top surface, the door top surface and the top wall top surface lying in a common top plane when the door is in the closed position.

15. The assembly of claim 14, wherein the frame and the door are bounded axially by the common top plane when the door is in the closed position.

16. The assembly of claim 1, further comprising a detent surface fixed to the frame axially intermediate the lip and the inner wall top edge; and a latch rotatably mounted to the door, the latch rotatable relative to the door between an engagement position for engagement with the detent surface to secure the door to the frame when the door is in the closed position, and a disengaged position in which the latch is clear of the detent surface for permitting movement of the door between the open and closed positions.

17. The assembly of claim 16, wherein the detent surface is spaced laterally inwardly from the inner wall.

18. The assembly of claim 16, wherein the detent surface is laterally intermediate the inner wall and the lip inner edge.

19. The assembly of claim 16, wherein the latch is axially intermediate the inner wall bottom edge and the detent surface when the door is in the closed position.

20. The assembly of claim 16, wherein the latch is spaced laterally inwardly from the inner wall when the door is in the closed position and the latch is in the engagement position.

21. A molded access door assembly for an access opening in a wall or ceiling, the assembly comprising: (a) a molded frame including: an inner wall having an inner wall bottom edge for positioning against the wall or ceiling about the access opening, and an inner wall top edge spaced orthogonally away from the inner wall bottom edge, a lip extending from the inner wall bottom edge to a lip inner edge spaced laterally inwardly from the inner wall bottom edge, the lip inner edge extending about a perimeter of a frame opening defined by the frame, the lip including fastener holes for receiving fasteners to secure the frame against the wall or ceiling; (b) a molded door hingedly connected to the frame and movable between an open position providing access to the frame opening and the fastener holes and a closed position in which the door covers the frame opening and covers an entirety of the fastener holes; (c) a detent surface fixed to the frame axially intermediate the lip and the inner wall top edge; and (d) a latch rotatably mounted to the door, the latch rotatable relative to the door between an engagement position for engagement with the detent surface to secure the door to the frame when the door is in the closed position, and a disengaged position in which the latch is clear of the detent surface for permitting movement of the door between the open and closed positions.

22. The assembly of claim 21, wherein the detent surface is spaced laterally inwardly from the inner wall.

23. The assembly of claim 21, wherein the detent surface is laterally intermediate the inner wall and the lip inner edge.

24. The assembly of claim 21, wherein the latch is axially intermediate the inner wall bottom edge and the detent surface when the door is in the closed position.

25. The assembly of claim 21, wherein the latch is spaced laterally inwardly from the inner wall when the door is in the closed position and the latch is in the engagement position.

26. A molded access door assembly for an access opening in a wall or ceiling, the assembly comprising: (a) a molded frame including: an inner wall having an inner wall bottom edge for positioning against the wall or ceiling about the access opening, and an inner wall top edge spaced orthogonally away from the inner wall bottom edge, an outer wall having an outer wall bottom edge for positioning against the wall or ceiling about the access opening, and an outer wall top edge spaced orthogonally away from the outer wall bottom edge, a top wall extending between the inner wall top edge and the outer wall top edge, and a lip extending from the inner wall bottom edge to a lip inner edge spaced laterally inwardly from the inner wall bottom edge, the lip inner edge extending about a perimeter of a frame opening defined by the frame, the lip including a generally flat lip bottom surface for bearing against the wall or ceiling adjacent the access opening and a lip top surface opposite the lip bottom surface, the lip bottom surface and the outer wall bottom edge lying in a common plane, the access door assembly bounded axially by the common plane, and the lip further including fastener holes passing through the lip bottom surface for receiving fasteners to secure the frame against the wall or ceiling, wherein each fastener hole is spaced laterally inwardly from the inner wall and a respective portion of the lip top surface extends laterally between each fastener hole and the inner wall; (b) a molded door hingedly connected to the frame and movable between an open position providing access to the frame opening and the fastener holes and a closed position in which the door covers the frame opening and the fastener holes; (c) a detent surface fixed to the frame axially intermediate the lip and the inner wall top edge and laterally intermediate the inner wall and the lip inner edge; and (d) a latch rotatably mounted to the door, the latch axially intermediate the inner wall bottom edge and the detent surface when the door is in the closed position, and the latch rotatable relative to the door between an engagement position for engagement with the detent surface to secure the door to the frame when the door is in the closed position, and a disengaged position in which the latch is clear of the detent surface for permitting movement of the door between the open and closed positions.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Preferred embodiments of the present invention are illustrated in the attached drawings in which:

(2) FIG. 1 is a perspective view of a preferred embodiment of the plastic access door assembly of the present invention attached to a wall opening;

(3) FIG. 2 is a perspective view of the access door assembly of FIG. 1;

(4) FIG. 3 is a front view of the access door assembly of FIG. 1;

(5) FIG. 4 is a back view of the access door assembly of FIG. 1;

(6) FIG. 5 is an exploded perspective view of the components of the access door assembly of FIG. 1;

(7) FIG. 6 is a close-up view of the hinge assembly of the access door assembly of FIG. 1; and

(8) FIG. 7 is a view in cross-section of the hinge assembly.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(9) A first preferred embodiment of an access door assembly of the present invention is illustrated in the attached drawings, generally indicated by the numeral 10. Access door assembly 10 is for attachment to a wall or ceiling surface to cover an opening 12 provided in a wall or ceiling covering material 14 to allow access to services provided within the cavity of the wall or ceiling behind the wall or ceiling covering 14.

(10) As illustrated in the figures, the access door assembly 10 comprises a frame assembly 20 to which is hingedly attached a door 22 as will be described further below. The frame assembly 20 comprises a frame channel 24 having an outside wall 26, an inside wall 28 and a top wall 30. The frame channel 24 is orientated such that the open bottom between the outside wall 26 and inside wall 28 is orientated towards the wall or ceiling covering material 14 when the access door assembly 10 is installed. The provision of the frame channel 24 increases the rigidity of the frame assembly 20 and in turn the entire access door assembly 10 without an increase in weight or cost.

(11) A lip 32 is provided attached to the lower edge of the inside wall 28, the lip 32 extending into the opening in the interior of the frame assembly 20. As will be described further below, one function of the lip 32 is provide for a stop and rest for the door 22 when the access door assembly 10 is in the closed position.

(12) In addition, the lip 32 is provided with a means for attaching the access door assembly 10 to the wall or ceiling covering material 14. One such means illustrated in the drawings is the provision of holes 34 which accept suitable screws 36 for attaching the access door assembly 10 to the wall or ceiling covering 14. Preferably the holes 34 are countersunk to allow the use of countersunk screws 36 such that when the screws 36 are installed, the heads of the screws 36 lie flush with the surface of the lip 32 and do not interfere with the closing of the door 22. By providing the means for attaching the access door assembly 10 to the wall or covering material 14 on the surface of the lip 32, it is not necessary that strapping be provided in the interior of the cavity. Rather for gypsum board covering, a hole could be drilled through the covering to match up with the holes 34 in the lip 32 and a suitable wall anchor which grips and holds the screw 36 is placed within the hole. This arrangement results in a faster and easier installation of the access door assembly of the present invention as compared to the prior art arrangements.

(13) The door 22 also includes a means for releasably securing the door 22 in the closed position. In the embodiments illustrated in the figures, the means for releasably securing the door 22 is a rotatable latch 38 which engages a latch receiving detent 40 provided on the lip 32 of the frame assembly 20. As illustrated in the drawings, in order to enable the flush mount of the frame assembly 20 to the wall or ceiling covering material 14, the latch receiving detent 40 is preferably provided as a raised detent 40 which provides a space between the bottom of the detent 40 and the wall or ceiling covering material 14 to receive the rotatable latch 38.

(14) The rotatable latch 38 has a rotatable post 42 which is rotatable by turning a knob or key access 44 at the top of the rotatable post provided on the exterior surface of the door 22. A tab 46 is attached to the bottom of the rotatable post 42 such that the tab 46 rotates with the rotatable post 42 and engages the underside of the latch receiving detent 40 to releasably secure the door 22 in the closed position. In order to provide a more secure engagement of the tab 46 and the latch receiving detent 40, the tab 46 may be provided with a raised ridge 48 which engages with a recess 49 provided in the underside of the latch receiving detent 40. As the tab 46 on the rotatable post 42 is rotated to the closed position, the raised ridge 48 rides over the underside surface of the latch receiving indent 40 until it drops into the recess 49 and helps to hold the door 22 in the closed position. To open the door 22, the knob or key access 44 is rotated to the open position which rotates the attached rotatable post 42 and tab 46 until the raised ridge 48 on the tab 46 disengages from recess 49 of the latch receiving detent 40 and allows the door 22 to be opened.

(15) A preferred embodiment of the hinge connection between the frame assembly 20 and door 22 is illustrated in detail in FIGS. 5 to 7. Door 22 is provided along one edge with a first part of a hinge assembly 50 along one edge and the frame assembly 20 is provided with the matching second part of the hinge assembly 52 along one edge. In the embodiment illustrated, the first part of the hinge assembly 50 has a generally circular hinge member 54 with hinge pins 56 protruding from both ends of the generally circular hinge member 54. The matching second part of the hinge assembly 52 include a cutout 58 in the frame channel 24 of the frame assembly 20 sized to accept the generally circular hinge member 54 of the door 22. Hinge pin receiving holes 60 are provided in each end of the cutout 58 to receive the hinge pins 56 of the first part of the hinge assembly 50. The hinge pins 56 in the hinge pin receiving holes 60 securely hold the door 22 to the frame assembly 20 and allow it to rotate from the open to the closed position. The provision of the first and second parts of the hinge assembly 50 and 52 on the edges of the door 22 and frame assembly 20 respectively allow the door to 22 to fully open and provide access to the full dimensions of the opening formed by the interior edges of the lip 32. This allows for a smaller dimensioned door assembly for an equivalent opening compared to the prior art plastic access doors.

(16) As illustrated in the figures, the door 22 has a top surface 62 and an wall 64 extending downwardly from the top surface around the edge of the top surface 62. The height of the wall 64 is about equal to the height of the inside wall 28 of the frame channel 24 above the lip 32. In this way, when the access door assembly 10 is in the closed position, the lower edge 66 of the wall 64 of the door 22 rests against the lip 32 and provides a flush, finished appearance to the access door assembly 10.

(17) The provision of the lower edge 66 of the wall 64 of the door 22 resting against the lip 32 of the frame assembly 10 also allows the access door assembly 10 of the present invention to be made airtight or soundproof. If desired, resilient sealing material such as a rubber strip could be provided on either the lower edge 66 or the lip 32 to provide for airtight or soundproof sealing between the lower edge 66 and the lip 32.

(18) It will be appreciated by those of skill in the art that the height of the walls 64 and 28 can be varied to give a higher or lower profile to the access door assembly 10 as desired. Preferably, the height of the walls 28 and 64 is selected to allow the access door assembly 10 to match DECORA™ electrical outlets and switch plates to allow the access door assembly 10 to appear as another such plate. In addition, the access door assembly 10 of the present invention may be provided in a number of different sizes, depending upon the application. For example, for shut off valves and connectors for services such as natural gas, a 6 inch by 6 inch panel is commonly used, while for clean out fittings for DWV and shut off valves for the main water supply, sizes up to 12 inches by 12 inches or larger may be used. The access door of the present invention is easily adapted to such a variety of sizes.

(19) The access door assembly of the present invention is molded from any suitable thermosetting or thermoplastic material such as polyvinylchloride, polystyrene, polyamides, or ABS. Preferably, the access door assembly of the present invention is molded from an ABS material which can be colored to a suitable color to match the desired decor.

(20) The access door assembly of the present invention provides numerous advantages over the previously available access door assemblies. It is of less weight and cost compared to the prior metal door assemblies. In addition, it is easier to install, not requiring additional strapping around the wall opening to support the access door assembly. When compared to the prior plastic door assemblies, the access door assembly of the present invention provides for a larger opening access and is easier to install. In addition, the life expectancy is significantly increased.

(21) Although various preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those of skill in the art that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.