Showing papers on "Cover (telecommunications) published in 1980"

Fire alarm signal station

Abstract: This disclosure relates to an apparatus for fire alarm signaling which is economical and versatile and which makes use of the properties and characteristics of the material of which it is made. All components of the assembly snap together. An auxiliary cover as well as the main cover may be used. A lower break-rod is mounted on the base and cammed aside as the main cover is closed and then the break-rod returned to a position to be broken in response to opening the main cover, an upper break-rod may be associated with the auxiliary cover. Up to three switches may be provided and each has a latched position. A simple tool is used to release the switch latch. The latch comprises an integral part of the base and/or switch stems. During assembly selected elements may be selectively oriented to make any switch have either normally-open or normally-closed contacts. The catch between the main cover and base permits easy actuation and yet inhibits false actuation in response to a blow. No internal wiring is required.

Relay for printed circuit board

Abstract: A relay for a printed circuit board, which can be dip-washed, comprising a relay cover which is mounted and sealed to a relay body, said relay cover being provided with a thin-walled portion which can be easily broken after dip-washing to define an opening in the cover.

Self securing tonneau cover

Abstract: A vehicle tonneau cover including new features and improvements to allow the tonneau cover to position, attach, and secure itself to a vehicle through the use of tabs extending down from the tonneau cover, thereby allowing the vehicle to remain as originally manufactured.

Lockable keyboard cover for telephones - has lockable clamp over and under keyboard to hold telephone rear, with facility for limited keyboard operation

Abstract: The cover plate is intended for telephone keyboards to prevent all or some outgoing calls being dialled. The cover plate (24) over the keyboard (20) is locked (40) to a base plate (28) under the telephone and hooked securely at the rear (30, 32) into a moulded recess etc. Holes (48) may be cut into the cover plate to reveal a limited number of push-buttons (22) so that certain limited dialling access may be possible, e.g. to fire and police services. For rotary dial telephones limited rotary travel may be allowed.

Flexible swimming-pool cover

Abstract: A flexible swimming-pool cover which has a channel system simultaneously acting as a solar collector and is designed so that it can be deaerated and folded up.

Rat trap using electric shock - has cover with trap door to which runway with built in in electrode leads

Abstract: The rat trap has a bucket-like container (1) of electrically non-conductive material, with a cone shaped cover (2) including a central automatic trap door (4a, 4b). Above the trap door is a path extending from one side of the container to the other, the path having electrically conductive running faces. In the middle of the path is an insulated electrode (9) to which accepts a bait. The conductive runway surfaces and the electrode are connected to the terminals of a high voltage supply.

Switch operating device

Abstract: A cover including switching chambers and housing contact carriers is associated with a base supporting two slides which act by the intermediary of frames either directly on the contacts, or through the intermediary of springs.