Communications: radio wave antennas – Antennas – Spiral or helical type
Reexamination Certificate
2000-03-23
2001-04-24
Wimer, Michael C. (Department: 2821)
Communications: radio wave antennas
Antennas
Spiral or helical type
C343S873000
Reexamination Certificate
active
06222506
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates, in general, to a transmitting and receiving antenna for animal training devices and, more particularly, to a transmitting and receiving antenna attached to a transceiver for animal training devices and used for transmitting and receiving signals of a specific frequency band.
2. Description of the Prior Art
A conventional transmitting and receiving antenna, which is usable with animal training devices, is shown in FIG.
1
. As shown in the drawing, the conventional antenna for animal training devices comprises a stud bolt
7
, which consists of a hexagonal body
1
, an externally-threaded connector
3
and a support projection rod
5
. The hexagonal body
1
has a hexagonal cross-section, with the externally-threaded connector
3
extending from one end of the body
1
and the support projection rod
5
extending from the other end of the body
1
. A flexible coil spring
9
is fitted over the stud bolt
7
and is fixed to the bolt
7
through a soldering process. A longitudinal rod
11
, made of glass fiber, is inserted into the outside end of the coil spring
9
. A loading coil
13
is fixed to the coil spring
9
at one end thereof through a soldering process and is coiled around the longitudinal rod
11
. The antenna also has a protection cover
15
, which is assembled with the hexagonal body
1
of the stud bolt
7
so as to cover both the coil spring
9
and the loading coil
13
wound around the longitudinal rod
11
. This protection cover
15
thus protects both the coil spring
9
and the loading coil
13
.
In such a conventional transmitting and receiving antenna, it is necessary to use a flexible coil spring
9
, which is formed by regularly coiling a copper-plated flexible steel wire at a predetermined pitch, so as to allow the antenna to elastically maintain its desired straight shape while being free from being cut or bent when the antenna is unconsciously caught by an obstacle. Due to such a flexible coil spring
9
, it is impossible to reduce the length of the antenna to a desired short length. This finally forces the antenna to have such an awkward length that the antenna is inconvenient to a user while carrying or using it.
In addition, it is necessary to cut a length of the distal end of the loading coil
13
, wound around the longitudinal rod
11
made of glass fiber, in order to set a specific frequency band and to allow the antenna to transmit and receive signals of such specific frequency band. It is thus very difficult to precisely or finely control the frequency band of signals to be transmitted and received by the antenna. When an exceeding length of the loading coil
13
is unconsciously cut while setting a specific frequency band of signals to be transmitted and received by the antenna, it is impossible for a resulting antenna to transmit or receive signals of the specific frequency band. This finally reduces the operational reliability of such antennae.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a transmitting and receiving antenna for animal training devices, which is convenient to a user while carrying and using it.
Another object of the present invention is to provide a transmitting and receiving antenna for animal training devices, which is designed to easily set a desired specific frequency band of signals to be transmitted and received by the antenna.
A further object of the present invention is to provide a transmitting and receiving antenna for animal training devices, which is improved in production yield.
Still another object of the present invention is to provide a transmitting and receiving antenna for animal training devices, which has a desired short length.
In order to accomplish the above object, the present invention provides a transmitting and receiving antenna for animal training devices, comprising: a stud bolt consisting of a hexagonal body, with an externally-threaded connector and an internally-threaded bushing provided at opposite ends of the hexagonal body; a cylindrical bobbin having an externally-threaded part at a first end thereof and assembled with the internally-threaded bushing of the stud bolt at the externally-threaded part through a screw-type engagement, with an internally-threaded hole being axially formed on a second end of the bobbin and being used for setting a desired specific frequency band of signals to be transmitted and received by the antenna, and a radial hole being formed on the bobbin at a position around the externally-threaded part in a way such that the radial hole is perpendicular to a central axis of the bobbin; a helical coil inserted into the radial hole of the bobbin at one end thereof so as to be fixed to the stud bolt at the end through a soldering process, the helical coil being regularly, densely and spirally coiled around the bobbin; a core movably engaging with the internally-threaded hole of the bobbin through a screw-type engagement and used for precisely and finely setting the desired specific frequency band of signals; and a protection cover removably assembled with the hexagonal body of the stud bolt so as to cover and protect both the core and the helical coil, the protection cover having a longitudinal cavity designed to receive both the core and the helical coil therein, with a hexagonal fitting mouth communicating with the cavity and being formed at an end of the protection cover so as to be fitted over the hexagonal body of the stud bolt.
REFERENCES:
patent: 4214247 (1980-07-01), Richmond
patent: 6052097 (2000-04-01), Duncan et al.
patent: WO 95/08853 (1995-03-01), None
patent: WO 95/08199 (1995-03-01), None
Mathews, Collins, Shepherd & Gould
Wimer Michael C.
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