JP2996781B2 - Upper mold opening and closing device in hinge-joined mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to both so that the upper die against the lower die which can be opened and closed is attached via a hinge pin, on
A rotational force in the direction in which the mold is opened always acts on the hinge pin.
The present invention relates to an upper mold opening / closing device in a hinge-joined mold in which a spring means is elastically mounted on a hinge joint.

[0002]

2. Description of the Related Art In the above-described mold, for example, two separate weather strips formed by extrusion molding are adhered to each other using a core, and the adhered portion is formed into a corner portion of the entire weather strip. Used when In a mold of this type, when the upper mold is lifted, the entire weight becomes a load, so that in a heavy mold, the workability is significantly reduced, and the degree of fatigue of the worker is increased. For large ones, the upper mold may not be lifted by hand. Therefore, as shown in FIG.
By mounting the balance weight 32 on the side of the hinge connection portion 1 or mounting a pneumatic cylinder on the end of the upper die 31 facing the hinge connection portion, the force required to lift the upper die 31 can be reduced. It has been implemented. However, such a means has the disadvantage that the area occupied by one mold at the work site becomes large, and the use of a pneumatic cylinder or the like increases the equipment cost, and in addition, reduces the workability.

For example, Japanese Utility Model Laid-Open No. 57-23418 discloses
As shown, the upper mold can be opened and closed with respect to the lower mold.
As shown in the figure, the hinge
In the compound mold, the rotational force in the opening direction of the upper mold is
Spring means for always acting on the zipin hinge connection
To reduce the force required to lift the upper mold by hand
What caused it is known. However, said spring means
Cannot adjust its spring force and use it for a long time.
Then, the spring force decreases due to fatigue,
The degree also decreases.

[0004]

SUMMARY OF THE INVENTION The present invention relates to the above-described light source.
To the hinge-joined mold with spring means
And adjust the spring force of the spring means
The task is to make it possible to lift the upper die by force.
You.

[0005]

In order to solve this problem, the present invention adopts a means in which the upper and lower dies are connected via hinge pins so that the upper and lower dies can be opened and closed.
Opening torque is always applied to the hinge pin.
The spring means for the
Holding the end opposite to the hinge connection portion by hand.
In the hinge-joined mold configured to open and close the upper mold,
A hinge pin attached to the upper mold and the lower mold, the upper mold
Connected together so as to rotate integrally with the
Extend the zipin to at least one side and attach it to the extension
Attach a coil spring and connect one end of the coil spring to the lower mold
And the other end is screwed into the extended end of the hinge pin.
That is, it is connected to the adjusted nut .

[0006]

When the adjusting nut is screwed in, the coil spring is
At the same time as being compressed, it is twisted and twists into the coil spring.
Force is generated, and this torsional force is released to the upper die.
Act in the direction Therefore, the force to lift the upper mold is
Reduced by the amount of torsion force of the coil spring,
Can be lifted by force. Adjustment nut screw
Adjusting the amount of inset to freely adjust the force to lift the upper mold
For example, torsional force due to coil spring fatigue
If it becomes smaller, screw in the adjustment nut further,
The torsional force of the coil spring can be increased. As a result,
The upper die can be lifted by the optimal force.

[0007]

The present invention will be described in more detail with reference to the following examples.
explain. FIG. 1 is a side view of the mold, FIG. 2 is a rear view thereof, and FIG. 3 is a longitudinal sectional view of a hinge coupling portion of the mold. A bracket 3 is integrally attached to a back surface of the upper mold 1 via a pair of fixing bolts 2, and a bracket 6 is also integrally attached to a back surface of the lower mold 4 via a pair of fixing bolts 5. . At the center of the bracket 6, a concave portion 6a opened on the upper surface is formed, and the bracket 3 attached to the upper die 1 enters this concave portion 6a. The upper mold 1 rotates about the hinge pin 7 with respect to the lower mold 4 to open and close.

As shown in FIG. 3, the bracket 3 attached to the upper mold 1 and the hinge pin 7 are integrated via a key 8 along the axial direction of the hinge pin 7.
For this reason, the upper mold 1 is integrated with the hinge pin 7 and
To rotation around the hinge pin 7. The hinge pin 7
The bracket 6 attached to the lower die 4 protrudes greatly from both side surfaces, and a right-handed male screw 9a and a left-handed male screw 9b are formed at both ends thereof. 2 and 4
As shown in the figure, the right-handed coil spring 11a has both ends greatly extended in the tangential direction, and the hook portions 12a, 1
2b. The left-handed coil spring 11b differs only in the winding direction, and has hook portions 12a and 12b similar to the above at both ends. The adjustment nut 13 is, as shown in FIG.
The hook pin 13b is fixed to "a" by welding.

The right-handed male screw 9 of the hinge pin 7
The left-handed coil spring 11b and the right-handed coil spring 11a are mounted on each of the protrusions on the side where the male screw 9b is formed. Hook bolts 14 are screwed into both side surfaces of the bracket 6 attached to the lower mold 4, and each male screw 9 formed at both ends of the hinge pin 7 is formed.
The adjustment nut 13 is screwed into each of the portions a and 9b. A hook portion 12a formed at one end (inner end in the mounted state) of each of the coil springs 11a and 11b is hooked on the hook bolt 14, and a hook portion 12b formed at the other end is connected to the adjusting nut 13 Hook 13b. In this state, when the adjusting nuts 13 are rotated in a direction in which the two approach each other, the forming directions of the male screws 9a and 9b formed at both ends of the hinge pin 7 are opposite to each other, and at the same time, the Since the winding directions of the coil springs 11a and 11b mounted on the respective projecting portions from both side surfaces of the bracket 6 are opposite to each other, the respective coil springs 11a and 11b are opposite to each other.
b is compressed to generate a predetermined torsional force. This torsional force acts as a rotational force on the hinge pin 7, and its direction is the direction in which the upper die 1 is opened, and its magnitude is adjusted by the screwing amount of the adjusting nut 13. Adjustment nut 1
A lock nut 15 is screwed to the outside of 3.
In FIG. 3, reference numeral 16 denotes a screw for preventing the key 8 from moving laterally.

As described above, each of the coil springs 11a, 11b
Since the torsional force acts in the direction of lifting the upper mold 1,
When the operator closes the upper mold 1 while reducing the force required to lift the upper mold 1 by holding the handle 17 attached to the end of the upper mold 1 opposite to the hinge joint, The force for supporting the upper mold 1 is also reduced. When used for a long time, the coil springs 11a and 11b are fatigued and their torsional force is reduced. In this case, the adjusting nut 13 is screwed in to recover the magnitude of the torsional force, or the coil spring itself is replaced. .

[0011]

The present invention has the above-described structure, and has an adjustment nut.
Adjust the torsion force of the coil spring
To adjust the force required to lift the upper mold.
It can be done freely. As a result, torsion occurs due to fatigue of the coil spring.
If the force decreases, screw in the adjustment nut further.
And the torsion force of the coil spring can be increased, always optimal
The upper die can be lifted by a strong force.

[Brief description of the drawings]

FIG. 1 is a side view of a mold equipped with an upper mold opening / closing device according to the present invention.

FIG. 2 is a rear view of the same.

FIG. 3 is a longitudinal sectional view of a hinge connecting portion of a mold.

FIG. 4 is a side view of a mounted state of a right-handed coil spring 11a.

FIG. 5 is a perspective view of an adjustment nut 13;

FIG. 6 is a side view of a mold to which a balance weight 32 is attached.

[Explanation of symbols]

 1: Upper mold 4: Lower mold 7: Hinge pin 11a: Right-handed coil spring (spring means) 11b: Left-handed coil spring (spring means) 13: Adjustment nut

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B29C 33/26 B29C 39/26

Claims (2)

(57) [Claims] The upper die is connected to a lower die via a hinge pin so that the upper die can be opened and closed.
If the rolling force always acts on the hinge pin,
A spring means is mounted on the hinge joint, and
Open and close the upper mold by holding the end opposite to the
In the hinge-joined mold having the configuration described above, the hinge pin connecting the upper mold and the lower mold is
When connected to each other so as to rotate integrally with the upper die,
The hinge pin extends at least to one side
Thus, a coil spring is elastically mounted on the extension, and the coil spring is
One end is connected to the lower mold, and the other end is
Connected to an adjustment nut screwed into the extended end of the pin, and the rotation of the adjustment nut generates a torsional force on the coil spring.
Hinge-joined mold characterized by being configured to be
Upper die opening and closing device. 2. A hinge pin connecting an upper mold and a lower mold.
Is extended on both sides, and each extension has a coil spring
2. The vehicle according to claim 1, wherein
Upper die opening / closing device in a die-joining mold.