Metal working – Means to assemble or disassemble – Means to assemble electrical device
Reexamination Certificate
2002-06-12
2004-11-09
Arbes, Carl J. (Department: 3729)
Metal working
Means to assemble or disassemble
Means to assemble electrical device
C029S748000, C029S750000, C029S751000
Reexamination Certificate
active
06813826
ABSTRACT:
The present application is based on Japanese Patent Application No. 2001-178217, which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
This invention relates to a terminal crimping die system for crimping and connecting a terminal to an electric wire.
A terminal crimping machine is operative to crimp a terminal to an end part of an electric wire. There has been provided a conventional terminal crimping machine that uses a crimping die system consisting of a crimper (or upper die)
10
and an anvil (or lower die)
11
, as shown in FIG.
4
.
The crimper
10
has a recess
13
opened toward the anvil
11
, and is provided in such a way as to be able to move along the direction of gravity.
The anvil
11
is disposed under the crimper
10
, and formed in such a way as to have a section shaped so that the anvil
11
can be fitted into the recess
13
of the crimper
10
. The top surface of the anvil
11
is formed as a crimping face
14
. A curved terminal receiving groove
14
a,
on which a terminal
15
is put, is provided in this crimping face part
14
. The terminal
15
having a U-shaped section, in which a conductor is accommodated, is placed on the terminal receiving groove
14
a.
When the crimper
10
is lowered and both the anvil
11
and the crimper
10
vertically press the terminal
15
, respectively, both the end parts of the terminal
15
each having a top part, which comes into contact with a wall of the recess, gradually and upwardly go along the walls, so that the end parts are inwardly pushed and then bent. Thus, as shown in
FIG. 6
, the terminal
15
encloses the conductor and is crimped and caulked onto the conductor in such a way as to dig thereinto.
Meanwhile, as shown in
FIGS. 4 and 5
, the anvil
11
is provided with the terminal receiving groove
14
a
so that each of both end parts of the groove
14
a
is spaced from a corresponding one of both the end parts of the crimping face
14
toward the center thereof. That is, each of receiving surfaces
14
b
each extending along a direction nearly perpendicular to a direction, in which the anvil
11
is fitted, is provided between a corresponding one of both end parts of the terminal receiving groove
14
a
and that of both end parts of the crimping face
14
. This is configured by taking the durability of the anvil
11
into consideration. However, when the terminal
15
to be crimped is small, the (plate) thickness thereof is small and sometimes almost similar to the width b of each of the receiving surfaces
14
b.
When the plate thickness of the terminal
15
is comparable to the width b of each of the receiving surfaces
14
b,
and the terminal
15
is crimped onto the wire in this way, stress is concentrated on a part of the crimped terminal
15
(that is, a part B shown in FIG.
6
). That is, when the terminal is crimped, a caulking force f is generated in each crimped part, the receiving surface
14
b
bears the caulking force f generated in the vicinity thereof, so that the stress is concentrated on a part of the crimped terminal
15
(that is, the part B shown in FIG.
6
). Practically, for example, when a terminal having a terminal plate thickness of 0.25 mm is crimped by using 0.22-mm-wide receiving surfaces, stress is concentrated on a part of the crimped terminal
15
(that is, the part B shown in FIG.
6
). When stress is concentrated on a part of the terminal
15
, the durability of the terminal
15
may be degraded. Moreover, the electrical connecting performance thereof may be deteriorated. Furthermore, sometimes, the terminal
15
is not favorably connected to the wire.
Accordingly, the invention is accomplished in view of such circumstances. An object of the invention is to provide a terminal crimping die system enabled to favorably crimp a terminal to an electric wire without concentrating stress on a part of the terminal.
SUMMARY OF THE INVENTION
To achieve the foregoing object, according to the invention, there is provided a terminal crimping die system comprising: a crimper including a recess; an anvil provided with a crimping face including a terminal receiving groove and a pair of receiving surfaces, each of which is formed between an end part of the terminal receiving groove and an end part of the crimping face, the anvil being configured to be inserted into the recess of the crimper to thereby crimp and connect a terminal to an electric wire; wherein a width of the receiving surface is not more than ½ of a thickness of the terminal.
Preferably, the width of each of the receiving surfaces ranges from ⅕ to ⅖ of the thickness of the terminal.
With such a configuration, when the terminal is crimped, a caulking force is generated in each crimping part, the caulking force generated in the vicinity thereof partly acts in a direction toward the inside of the terminal receiving groove and is deconcentrated. This prevents the stress from being concentrated on a part of the terminal (that is, a part A shown in FIG.
3
), and enables the favorable crimp-connection of the terminal to an electric wire.
Further, in the present invention, a terminal crimping method comprising the steps of:
providing a crimper including a recess and an anvil provided with a crimping face including a terminal receiving groove and a pair of receiving surfaces, each of which is formed between an end part of the terminal receiving groove and an end part of the crimping face;
putting a terminal on the crimping face; and
inserting the anvil into the recess of the crimper, so that the terminal is crimped to an electric wire;
wherein a width of the receiving surface is not more than ½ of a thickness of the terminal.
Preferably, the width of the receiving surface may range from ⅕ to ⅖ of the thickness of the terminal.
REFERENCES:
patent: 3098517 (1963-07-01), Zimmerman et al.
patent: 4966565 (1990-10-01), Dohi
patent: 5025554 (1991-06-01), Dohi
patent: 5486653 (1996-01-01), Dohi
Ito Naoki
Kitagawa Hironori
Takayama Tsutomu
Arbes Carl J.
Yazaki -Corporation
LandOfFree
Terminal crimping dies does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Terminal crimping dies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Terminal crimping dies will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3327095