Movable or removable closures – Mounted for optional movements – One closure movable separately from or with other closure
Patent
1991-07-19
1992-11-10
Kannan, Philip C.
Movable or removable closures
Mounted for optional movements
One closure movable separately from or with other closure
E06B 728
Patent
active
051613280
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention concerns a service hatch insertable in doors and walls, with a frame insertable in an opening of a door or of a wall and a closing part connected to said frame and incorporating a service opening.
For a long time now, there has been a need to provide apartment doors in particular with such service hatches which allow an adequate view through the door and furthermore enable small items, documents, newspapers, letters and similar to be passed through the door without requiring the door to be opened. For elderly people, the disabled and children in particular, the need to open the apartment door to unknown third parties in order to receive the above-specified items, for example, involves an increasing degree of danger.
The invention concerned here is intended to fulfil the requirement for a service hatch of the above-mentioned type which is simple to handle, and which can be installed in a new or existing door leaf or wall via simple means.
In accordance with the invention, this task is solved via a service hatch of the above-mentioned type, characterised in that the closing part has a shock-proof, transparent panel, a fixing slot for fixing one edge of this panel and, on the opposite edge of the panel, a hinged handle which can be turned around a turning axle parallel to the two edges, whereby said handle bears a support rod at a distance from the turning axle, on which support rod the neighbouring edge of the panel rests.
The frame may be round or angular. It can be firmly connected to the closing part. Both parts form a firm anchoring unit to secure the service hatch in the door or wall.
By operating the hinged handle, the transparent panel can be removed from the fixing slot and released, to enable it to be swung up. It is possible to extend the width to the edge of the fixing slot, thereby creating a gap between the closing part and the panel prior to swinging up the panel, for the purpose of verbal communication.
A further embodiment of the invented service hatch involves a design whereby the fixing slot is located in the upper section of the closing part and the turning axle in the lower section. The opening movements are then assisted by the force of gravity.
A further embodiment of the invented service hatch involves the provision of two stops in the closing part, to limit the path of movement of the support rod, said stops defining the highest and lowest position of the support rod. When the support rod is in its highest position, the panel is inserted as far as possible in the fixing slot in closed position, or it may rest on the handle in open position.
A further embodiment of the service hatch involves a design whereby the handle has two parallel side-pieces and a handlebar which is held by the side-pieces, whereby the turning axle and the support rod are installed on bearings in the side-pieces. This results in a particularly simple, reliably operating construction.
A further embodiment of the invented service hatch involves a design whereby the handle is provided with at least one releasable locking bolt, which slots into the closing part for the purpose of locking the handle. This enables the handle and, subsequently, the panel to be fixed in any desired position, e.g. in completely closed position or in a partially open position for the purpose of verbal communication.
A further embodiment of the invented service hatch involves fixing the locking bolt(s) to a side-piece or both side-pieces of the handle. This results in advantages with regard to handling in particular.
A further embodiment of the invented service hatch involves each locking bolt being spring-loaded in the direction of its locking position. As a result, each bolt slots automatically into the next secured position.
A further embodiment of the invented service hatch involves each locking bolt being provided with a release lever. Such a lever, which is most expediently located on the handle, enables simple release of the fixing bolts and subsequent movement of the handle.
A further embodiment of the inv
REFERENCES:
patent: 1186565 (1916-06-01), Fogg
patent: 1722113 (1929-07-01), Sklar
patent: 2096740 (1937-10-01), Frankel
patent: 4245566 (1981-01-01), Shimansky et al.
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