Patent
1979-10-15
1982-12-21
Brown, Thomas W.
179100L, H04M 108
Patent
active
043651186
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to a connection arrangement for connecting an additional speech device in a telephone instrument of the type "DIAVOX" (a trade mark), which arrangement includes a push button mechanism and a cam shaft relay known per se.
BACKGROUND OF THE INVENTION
It has long been desirable that telephone instruments, provided with the usual lowspeaking device (conventional receiver in the handset), have the capability of having added thereto an additional speech device by means of a simple connection. An example of such an additional speech device is a loudspeaking element, the main handset and so on. In presently known telephone as, for example, "ERICOVOX" this can be carried out by a connection via an additional spring set.
In the presently developed telephone "DIAVOX" described in, for example, "Ericsson Review" No 3, 1977 (pages 112-113) an additional speech device for a loudspeaking function is provided in the instrument, a connection arrangement being required to achieve such connection between the two telephone functions.
SUMMARY OF AN INVENTION
The object of the present invention is to provide a connection arrangement in a telephone instrument of the above mentioned kind for connection between two telephone functions, for example, the lowspeaking and the loudspeaking function by utilizing contact means already existing in the telephone instrument.
Briefly, the invention contemplates apparatus for connecting an additional voice circuit to the voice circuits of a telephone instrument having a low speaker device. The apparatus includes hook switch means movable between an on-hook state and an off-hook state; a cam shaft relay means movable by the hook switch means between a first position wherein the voice circuits of the telephone instrument are in a rest state of the telephone instrument when the hook switch means is in the on-hook state and a second position wherein the voice circuits of the telephone instrument are connected to the low speaker device when the hook switch means is in the off-hook state, the cam shaft relay means being further movable to a third position wherein the voice circuits of the telephone instrument are connected to said additional voice circuit; a control push button means movable between a rest position and an activated position; and a tipping means pivotably mounted between the control push button means and the cam shaft relay means for moving the cam shaft relay means to the third position when the control push button means is moved to the activated position to connect the additional voice circuit to the voice circuits of the telephone instrument independently of the position of the hook switch means.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to the accompanying drawings, in which:
FIG. 1 is a side-view of a connection arrangement according to the invention;
FIG. 2 is a plan view of the arrangement shown in FIG. 1;
FIG. 3 is an exploded view of a push button mechanism included in the arrangement according to the invention;
FIG. 4 is a cross sectional view of a telephone instrument including the arrangement according to the invention;
FIG. 5 shows the same cross section as in FIG. 4 but with the handset raised; and
FIG. 6 shows the same cross section as in FIG. 5 but with connection arrangement activated.
PREFERRED EMBODIMENTS
The arrangement will at first be described with reference to FIGS. 1 and 2 with regard to its construction, whereafter its function in a telephone set for the connection and disconnection of an additional speech device will be described. The arrangement includes a push button mechanism generally denoted by reference numeral 1 which includes two push buttons 1a, 1b, frame formed supports 1c, 1d, for guiding the buttons 1a, 1b when these are depressed and a cover 1e which surrounds a locking mechanism for the button 1a as will appear more in detail from the exploded view according to FIG. 3. The push button 1a is on its one side provided with a gu
REFERENCES:
patent: 2757241 (1956-07-01), Droel
patent: 3406263 (1968-10-01), Klenk et al.
Branden Leif
Lindman Borje L.
Brown Thomas W.
Telefonaktiebolaget L M Ericsson
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