Electrical connectors – Having circuit interrupting provision effected by mating or...
Reexamination Certificate
2001-02-16
2001-09-18
Nguyen, Khiem (Department: 2839)
Electrical connectors
Having circuit interrupting provision effected by mating or...
C439S189000, C200S506000
Reexamination Certificate
active
06290520
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a television co-viewing series unit.
2. Description of Related Art
As shown in, for example,
FIG. 2
, a perspective explanatory view of a television co-viewing series unit (to be simply referred to as “series unit” hereinafter) has a coaxial cable connection terminal
3
provided on a side portion or a back portion thereof and supplied with a signal from an antenna, F-type terminals
4
each provided on a front surface and connecting a connection connector (not shown) for reception for a television or the like, and a resin panel
2
arranged on a front surface thereof. The F-type terminals
4
are arranged at the center of circular recesses
10
formed in the panel
2
, respectively. The series unit is used while the rear portion thereof is inserted into and attached to a switch box
12
provided in a wall surface and the front surface thereof is covered with a decorative laminated sheet
13
.
The conventional series unit is intended to transmit only a unidirectional signal from a signal source such as an antenna. Recently, a bidirectional system for outputting power or a signal from a reception end has been gradually used. The bidirectional system includes a unidirectional type for cutting a signal from the reception end with a high pass filter interposed between the system and the reception end and a bidirectional type which is not provided with a filter, which types are individually formed. If the unidirectional type is changed to the bidirectional type or vice versa, a series unit main body is replaced by another, accordingly.
However, as stated above, the series unit is used while the unit is attached to the switch box
12
and the front surface of the unit is covered with the decorative laminated sheet
13
. Due to this, if the series unit
1
is replaced by another, it is required to conduct laborious operations including the removal of the decorative laminated sheet
13
and that of the coaxial cable connected to the series unit
1
. Further, both the unidirectional type and the bidirectional type are the same in the shape of the terminal while the unit is incorporated into the switch box
12
and attached into the wall surface. Due to this, it is impossible to judge whether the unit is the unidirectional type or the bidirectional type at a glance.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a series unit capable of easily changing over a unidirectional state to/from a bidirectional state and easily judging whether the unit is in the unidirectional state or the bidirectional state.
To perform the above object, the invention recited in claim
1
is a television co-viewing series unit having a coaxial cable connection terminal provided on one of a rear portion and a side portion, a panel provided on a front surface, and an F-type terminal protrudingly provided in a recess formed in the panel, characterized by comprising: a high pass filter circuit; and changeover means for changing over a unidirectional state, in which the coaxial cable connection terminal and the F-type terminal are electrically connected to each other through the high pass filter circuit, to and from a bidirectional state, in which the coaxial cable connection terminal and the F-type terminal are directly connected to each other without the high pass filer circuit.
The invention recited in claim
2
is based on the invention recited in claim
1
and characterized in that the changeover means is a changeover switch having an operating protrusion on a wall surface in the recess and
by inserting a generally cylindrical adapter having almost the same outer dimension as an outer dimension of the recess into the recess, the changeover switch is pressed and operational.
The invention recited in claim
3
is based on the invention recited in claim
2
and characterized in that a non-contact region, which does not press the operating protruding when the adapter is inserted into the recess, is formed on a side portion of the adapter.
The invention recited in claim
4
is based on the invention recited in claim
3
and characterized in that a mark indicating and located at a position of a front surface of the adapter near a non-contact region and a mark indicating and located at a position of a front surface of the panel near the operating protrusion are provided, respectively.
REFERENCES:
patent: 5317392 (1994-05-01), Ishibashi et al.
patent: 5788519 (1998-08-01), Stern
patent: 5909063 (1999-06-01), Stillman et al.
patent: 6005497 (1999-12-01), Snyder
Maspro Denkoh Co., Ltd.
Nguyen Khiem
Pearson & Pearson LLP
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