76results about "Trap doors" patented technology

A decorative lattice that simulates the look and feel of decorative ironwork by combining carving techniques and coating techniques is described. The decorative latticework is made of a sheet material such as a composite wood/fiber board material. The decorative lattice is suitable for a mass customization manufacturing processes.

A flexible loft hatch insulation device as suitable to be used on all different types of loft hatches. Manufactured from a variety of different insulation materials including various waste streams. Application includes insulation as well as draught proofing.

An attic access apparatus comprises an access frame with sidewalls extending upward from a flange member and configured to extend upward into an attic opening between structural members forming the attic opening. A recessed groove along inner surfaces of the sidewalls is configured such that fastening screws can be located in the groove. A trim flange extends outward from the sidewall to cover fasteners used to fasten the ceiling to the bottom of the structural members, and a support flange extends inward from the sidewalls to form a support flange. An insulated lid drops into the access opening formed by the inner surfaces of the sidewalls and rests on the support flange, and a seal member provides a seal between the lid and the access frame to prevent air movement between the lid and access frame.

The invention discloses a large self-balancing type safe and labor-saving cover plate device which is used for being arranged at a lifting opening of floor slabs, and a framework is arranged around the lifting opening. The large self-balancing type safe and labor-saving cover plate device comprises a pair of guide rails, multiple cover plates and a lifting device, wherein the guide rails are respectively arranged on two opposite sides of the lifting opening, one end of each of the pair of guide rails is connected with the framework in a pivoted mode, the multiple cover plates are movably supported on the pair of guide rails, and the cover plates have an unfolded state and a folded state. The lifting device is used for lifting and descending the other end of each of the pair of guide rails so that the multiple cover plates are enabled to be switched between the unfolded state and the folded state. According to the large self-balancing type safe and labor-saving cover plate device, through the change of the rotation angles of the guide rails relative to the framework, a purpose of adjusting the gravity centers of the cover plates is achieved, and therefore the heavy cover plates can be opened and closed through utilization of self weights of the cover plates without the need of any additional auxiliary devices, the manufacturing cost is lowered, the problem that long cover plates cannot be manufactured on the principle that the folded cover plates only rely on counterweight is solved, and the operation process is enabled to be simpler and more convenient.

A removable cover for an opening in a structure comprising a rigid sheet attached to the opening on the surface of the structure to be covered by means of magnets and a ferrous frame attached to either the surface to be covered or the cover itself and capable of providing both insulation and sealing of the opening when such magnets are in contact with the frame.

The invention provides a trapdoor for driving station or turning-over station, which comprises a door sheet (1) and a hinge (2), wherein the hinge (2) is equipped below the door sheet (1) in hidden way, the hinge (2) is a plane four bar mechanism hinged by four hinge rods (5, 6, 7, 8), the shortest hinge rod (5) is directly or indirectly fixedly connected with the door sheet (1), the hinge rod (7) opposite to the shortest hinge rod is directly or indirectly fixedly connected with a truss (4) or a door sheet frame (3), thus the door sheet (1) and the hinge rod (2) connected therewith form a trapdoor capable of being opened in folding way. The invention has unique design, and is easy to realize the opening of the trapdoor. The invention can be very conveniently used, does not affect esthetic appearance, and has good application prospects.

The invention discloses a waterproof object lifting hole. The waterproof object lifting hole comprises a framework, cover plates, a guardrail, a cover plate joint waterproof device which is used for containing water that leaks from a joint of two adjacent cover plates, and a framework diversion trench which is used for containing and guiding water that leaks from connecting gaps between the framework, the cover plates and the guardrail, wherein the framework diversion trench is communicated with a cover plate diversion trench. The waterproof object lifting hole has the advantages of simple structure, easiness in realization and remarkable waterproof effect.

The invention discloses a hoisting hole. The hoisting hole comprises a cover plate and a guardrail and further comprises a linkage device. The guardrail is a folding mechanism, and the linkage device is respectively connected with the cover plate and the guardrail. While the cover plate is opened or closed, the guardrail is driven to be opened or closed through the linkage device. Production cost is saved, and the device is fast to operate and easy to obtain.

The invention described herein relates to a utility vault door, or access door, positionable between closed, partially opened, and fully opened orientations and including at least one compression spring lift-assist mechanism for countering the weight of the vault door when positioning between the various orientations. The door may be selectively locked in the partially opened orientation and opened sufficiently for the convenient ingress and egress of large equipment therethrough.

The present invention relates to a device to assist the opening of a covering element pivotably mounted relative to an edge of a frame. According to the invention, an assistance cylinder (6) includes a hollow shaft (7), a guide pin (10) inserted in the hollow shaft (7) and of which the end thereof opposite the end wall (8) comprises a yoke (11), a spring (13) inserted in the hollow shaft (7) surrounding the guide pin (10) and mounted pre-stressed when unloaded between the end wall (4) of the hollow shaft (7) and the yoke (11) of the guide pin (10), and a means (14) secured to the end of the guide pin (10) and engaging with the end wall (8) of the hollow shaft (7) for keeping the pre-stressed spring (13) in the released state thereof. The invention is useful in the field of road systems.

A window well cover for a below-grade or basement window is disclosed. A transparent upper structure or portion is designed to cover a below-grade window on an outside of a building or other structure. The upper end of the transparent upper structure extends, or is angled, downwardly from a mounting flange terminating at a lower end. Furthermore, the transparent upper structure has two curved sides, which serve to connect the side ends. Mounting flanges extend outwardly from the two side ends. The window well cover includes a vent portion integrally formed therewith of an air pervious material to allow continuous air exchange through the window well cover. The vented portion may extend the length of, or the entire lower periphery of, the transparent upper structure. The window well cover, which is free of movable parts, allows for continuous airflow through the window well cover while restricting the entry of debris and insects.

A flexible attic access cover positionable for attachment to the framework of an attic access opening of an attic access door for the purpose of reducing heat transfer between the attic and conditioned portion of a building or house.

An insulated attic access enclosure is formed from at least one side case, preferably two, and a top case that are adapted to receive an insulating material. The side case is wrapped around the attic access opening to define a sidewall enclosure. The top case is positioned atop the sidewall enclosure and may be attached to the sidewall to define at least one hinged access panel in the top case.