Communications: radio wave antennas – Antennas – With vehicle
Reexamination Certificate
2001-08-16
2002-11-26
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
With vehicle
C343S900000, C343S906000
Reexamination Certificate
active
06486843
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2000-249676, filed Aug. 21, 2000, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an on-vehicle rod antenna device.
2. Description of the Related Art
FIG. 1A
is a figure which shows an external configuration of the conventional on-vehicle rod antenna device. The rod antenna device
10
is constructed such that the antenna rod
13
is screwed and attached to the joint assembly
12
rotatably provided on the antenna base
11
mounted on the vehicle as shown in FIG.
1
A.
FIG. 1B
is a figure which shows an external configuration of the joint assembly
12
, especially, in a state of detaching the antenna rod
13
. In
FIG. 1B
, the antenna rod cover
13
a
forms the outer surface of the above-mentioned antenna rod
13
.
A tip portion of the joint assembly
12
is covered with the antenna rod cover
13
a
by attaching the antenna rod
13
. The plurality of hexahedron-shaped the projections
12
b
(for example, at 4 portions) made of the resin with the ABS resin etc. is radially formed, along outer circumferential surface of the metal cylindrical body
12
a
screwed at inner circumferential surface on an tip portion of the joint assembly
12
.
FIG. 1C
shows an outline view of the joint assembly
12
.
A size of the outside diameter at the end surface position of the outer circumferential surface of each the projections
12
b
is set slightly larger than a size of the inside diameter of this contact portion of the antenna rod cover
13
a
with the corresponding elasticity. When screwing and attaching the antenna rod
13
to mount it on the joint assembly
12
, the inner surface of the antenna rod cover
13
a
is pushed by the projections
12
b
and transformed with elasticity. Thereby, the antenna rod
13
is prevented from loosening and departing from the joint assembly
12
by the outside power such as the vibrations.
That is, the projections
12
b
of the joint assembly
12
are formed as a stopper of the antenna rod
13
loosening to the vibration, etc. of the vehicle where the on-vehicle rod antenna device
10
is attached.
In the antenna rod
13
attached on the joint assembly
12
, the installation metal fittings (not shown in the figure) with a tip portion which screws to the above-mentioned cylindrical body
12
a
in cylindrical bottom of the antenna rod cover
13
a
are laid underground. Then, the antenna rod element (not shown in the figure) is drawn out and undergrounded to the axis portion of the antenna rod cover
13
a
so as to be connected with this installation metal fittings.
The outside diameter at the outer circumferential surface position of the projections
12
b
of the joint assembly
12
is set larger than the inside diameter at the position where the antenna rod cover
13
a
of the corresponding antenna rod
13
corresponds as mentioned above. By screwing the installation metal fittings of the antenna rod
13
to the cylindrical body
12
a
of the joint assembly
12
, when the antenna rod
13
is connected with the joint assembly
12
, The projections
12
b
transform the antenna rod
13
by the elasticity of the antenna rod cover
13
a
and the frictional force corresponding to the elasticity power is given to the inner surface of the antenna rod cover
13
a.
As a result, the antenna rod
13
is prevented from loosening from the joint assembly
12
by the vibration of the vehicle etc.
Therefore, since the locking effect of the projections
12
b
of the joint assembly
12
changes greatly according to largeness of elasticity of antenna rod cover
13
, largeness of friction with inside of the antenna rod cover
13
, the outside diameter at the outer circumferential surface position and a size of the antenna rod cover
13
a
inside diameter. A very small allowance is required at the manufacturing, there is a disadvantage of raising the manufacturing cost as a result.
In addition, when the outer circumferential surface of the projections
12
b
wear out by repeating the attaching/detaching of the antenna rod
13
to the joint assembly
12
, an initial locking effect is lost at once.
In EC safety standard (European safety standard), so that the projection object mounted on the car may never give the person harm, even the state of detaching the antenna rod
13
, it is a reference that all positions where the human body may be contacted to the joint assembly
12
have the roundness of R 2.5 mm or more (5 mm or more in the diameter) and the small R and the corner of less than R 2.5 mm are prohibited.
However, the cylindrical body
12
a
and the projections
12
b
of the joint assembly
12
and the neighborhood thereof have small R and the corner of less than R 2.5 mm as seen from FIG.
1
C. Therefore, it is not possible to agree with the above-mentioned EC safety standard.
BRIEF SUMMARY OF THE INVENTION
An object of the present invention is to provide an on-board rod antenna device in which a sufficient locking effect can be maintained for a long period without requiring a sever size accuracy in manufacturing, and a pointed component is not exposed to an outside, where the human body may be contacted, even in a state of detaching the antenna rod.
An on-vehicle rod antenna device according to the present invention is characterized by comprising: an antenna rod; and an antenna base comprising a joint section to which the antenna rod is connected, in which the joint section comprises a tip portion, the tip portion is covered with the antenna rod in a state of connecting the antenna rod, and a substantially hemisphere recess or salient engaging with an inner circumferential surface of the antenna rod is formed on an outer circumferential surface of the tip portion.
REFERENCES:
patent: 4047779 (1977-09-01), Klancnik
patent: 4243989 (1981-01-01), Piper
patent: 5616043 (1997-04-01), Liou
patent: 5661497 (1997-08-01), Calearo
patent: 5949386 (1999-09-01), Elliott
patent: 5950116 (1999-09-01), Baro
patent: 6100852 (2000-08-01), Calearo
patent: 0 443 172 (1991-08-01), None
patent: 0 800 226 (1997-10-01), None
patent: 08 335821 (1999-03-01), None
patent: 11274832 (1999-10-01), None
patent: WO 99 13530 (1999-03-01), None
patent: WO 99 48167 (1999-09-01), None
European Search Report for app. no. EP 01 30 7089, with cover letter from EPO dated Jul. 10, 2002.
Kawahata Junichi
Wang Jinsong
Harada Industry Co. Ltd.
Nguyen Hoang
Pennie & Edmonds LLP
LandOfFree
On-vehicle rod antenna device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with On-vehicle rod antenna device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On-vehicle rod antenna device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2944949