Presses – Reciprocating press construction – Spring or weight
Reexamination Certificate
1999-12-17
2002-01-08
Vo, Peter (Department: 3721)
Presses
Reciprocating press construction
Spring or weight
C072S445000, C072S452900
Reexamination Certificate
active
06336399
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an energizing device for a press die, and more particularly, to an energizing device for a press die that can be easily attached and detached and that is provided to be sufficiently safe.
2. Description of the Background Art
A conventional energizing device for a press die is shown in FIG.
7
and FIG.
8
. In such a press die, a workpiece, W is mounted on a supporting portion
102
of a lower die
101
such that a hole
105
may be formed in a piercing manner on a lateral surface of the workpiece W by means of a punch
104
that is horizontally arranged with respect to a passive cam
103
performing sliding movements in a lateral direction, wherein the passive cam
103
is driven by an active cam
107
of an upper die
106
.
In
FIG. 7
, the mold assumes a condition at a dead bottom center, and upon completion of the hole forming process, the upper die
106
is raised, and in the absence of pressuring force applied by the active cam
107
, the passive cam
103
is retracted through an energizing force of a coil spring
108
that is provided at a lower portion of the cam until it abuts against a terminating surface
110
of a wall body
109
.
Here, the coil spring
108
which functions to retract the passive cam
103
is arranged in that it is outwardly fitted to a guide pin
112
that is formed to be extruded in a horizontal condition by being screwed to a rising wall
111
such that one end surface abuts against the rising wall
111
, and the other end surface is made to abut against a supporting plate
113
wherein this supporting plate
113
is fixed to the passive cam
103
by means of a bolt
114
.
The supporting plate
113
includes a groove
115
that is open in a downward direction such that the guide pin
112
may be taken out at the time of performing maintenance or inspection. Due to the groove
115
in the supporting plate
113
, one part of the coil spring
108
abuts against the supporting plate
113
, while a remaining part of the coil spring
108
extends over the groove
115
and is not supported by the supporting plate
113
such that fit of the coil spring
108
with respect to the supporting plate
113
becomes unstable. Consequently, the coil spring
108
can no longer be disposed in a horizontal condition, which results in cases in which the coil spring
108
abuts against an outer periphery of the guide pin
112
, such that the guide pin
112
is worn or the coil spring
108
is deformed or seized so that the energizing device may not be completely actuated.
It is desirable to have an energizing device for a press die which is capable of eliminating the above-mentioned drawbacks such as the occurrence of deformation or seizing of the coil spring or damage to the guide pin, and which presents favorable operatability by enabling the coil spring or the guide pin to be easily attached or detached at the time of performing maintenance or inspection without the necessity of detaching the press die from the press machine while such operations can be performed in a safe manner.
In view of these facts, the energizing device for a press die according to the present invention has been devised with an energizing body for energizing a press member, by being disposed between two members to abut against both surfaces thereof so as to enable easy attaching/detaching of the energizing body while maintaining a condition in which the energizing body is attached to a press machine, wherein one of the members is provided with a plug of an outer diameter that is larger than an outer diameter of the energizing body and abutting against an end surface of the energizing body.
The energizing device for a press die of the present invention is particularly arranged in that the plug is threaded into the one member in order to be attached to the one member. A hexagonal taking-out hole is formed in a concave manner on a surface of the plug opposite to a surface of the plug which abuts with the energizing body.
Moreover, the press die includes a taking-out hole of an inner diameter that is larger than the outer diameter of the plug and which is pierced through a wall body of a lower die that is disposed so as to oppose the plug. Further, the press die may include a safety device for preventing jumping-out of the plug and/or the energizing body. The safety device is a safety plate that may be provided in a freely attachable/detachable manner to the one member so as to oppose the plug, or may be provided in a freely attachable/detachable manner on the wall body so as to oppose the plug.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 4342214 (1982-08-01), Neuendorf
patent: 4471680 (1984-09-01), Gerhart
patent: 5101705 (1992-04-01), Matsuoka
patent: 5341669 (1994-08-01), Katz
patent: 5711180 (1998-01-01), Sasahara et al.
patent: 5881599 (1999-03-01), Sasahara et al.
patent: 5884521 (1999-03-01), Fidziukiewicz
Huynh Louis
Umix Co., Ltd.
Vo Peter
LandOfFree
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