JPH039873Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is applicable to forging machines such as a forging machine that presses metal materials with punches and dies to form bolts, nuts, and other parts, or other metal parts. Used in the field of processing machinery.

The present invention is a device for tightening tools such as punches or dies with tightening bolts, and more specifically, it is a device that tightens tools such as punches or dies with tightening bolts, and more specifically, it tightens tools with a constant torque to prevent loosening and automatically performs proper tightening to prevent tightening from becoming too tight. This invention relates to an auto-lock screw fastening mechanism.

(Prior Art and Problems) In a machine that is subject to severe impact and vibration, a single bolt is used to mount and fix punches and dies in position. Various mechanisms have been devised and implemented in the past as devices for preventing bolts from loosening. Known locking devices generally have a hexagonal opposite side held by the bolt head to prevent rotation, or a simple locking mechanism covered with a cap. There is a problem that the lock cannot be applied unless the bolt is turned extra or loosened. If the fastening bolts are tightened too strongly, the screws will seize due to severe vibration and impact and become impossible to separate, so it is necessary to tighten them with the appropriate torque. Ideally, tightening with so-called loose screws should be neither too strong nor too weak, but in reality, the problem is that tightening with the appropriate torque must be done by feeling.

(Technical issue) Therefore, in the present invention, when the fastening reaches a certain value, it is made to idle so that the fastening can be performed with the appropriate torque, and after fastening, it is possible to avoid strong vibrations and impacts. The technical problem is to ensure fastening without loosening, and to easily loosen a screw with a single touch.

(Means for solving the problem) In order to solve the above technical problem, the present invention
In a device in which a tool such as a punch or die is inserted into a main body case and tightened with a fastening bolt, there is a hollow cylindrical holder case that is immovably provided integrally with the bolt fastening part of the main body case by screwing, and this holder case. A fastening cap for bolt rotation operation that is fitted into the bolt and is set to be pushed in and rotated by applying a spring pressure from the inside, and the fastening cap engages in the engagement portion consisting of a vertical groove in an unloaded state. The rotation is transmitted through a locking body that is elastically fitted with spring pressure, and when a load is applied, the bolt is fitted onto the shaft of the fastening bolt so that it disengages and rotates idly, and the fastening cap and holder case are connected to each other. It is provided with locking teeth for auto-locking, which are made up of engaging teeth that engage with each other so that when the fastening cap is pushed in, they separate. Further, in the present invention, the holder case is provided with a stopper so that when the fastening bolt is loosened, the stopper collides with the shoulder of the bolt at the upper limit position and thereafter rotates idly.

(Operation) The above technical means operates as follows. Third
4, when the fastening cap 1 is pushed in, the lock spring 2 is compressed and the fastening cap 1 is moved downward in the axial direction relative to the fixed holder case 3 and the fastening bolt 4. As a result, the lock teeth 5 and 6, which have been engaged with each other until now, are disengaged, and the fastening cap 1 becomes free to rotate.

When the fastening cap 1 is rotated in this state, if no load is applied to the fastening screw 4, the spring 7
The locking body 8, which is compressed by the bolt, engages with the engaging portion 9 provided on the shaft portion 4a of the bolt and is integral with the rotational direction, so rotation is transmitted and the fastening bolt 4 rotates together with the cap 1. . When the bolt end 4b hits the notch 10a of the punch 10 when it is rotated in the direction in which the screw is fastened, a load is generated, so the locking body 8 compresses the spring 7 and escapes from the engagement part 9. After that, the fastening cap 1 rotates idly. Therefore, the fastening bolt 4 is fastened with a constant torque value. After the tightening is completed, when the pressure on the cap 1 is released, the tightening cap 1 will be tightened due to the restoring elasticity of the lock spring 2.
is pushed back upwards, so that the lock teeth 5 and 6 engage again. The engagement of the lock teeth 5 and 6 prevents the lock from rotating, and henceforth functions to prevent loosening.

When loosening the bolt, tighten the tightening cap 1.
Rotate in the direction of loosening while pressing. Then, since no load is applied to the fastening bolt 4 in the loosening direction, the rotation of the cap 1 is transmitted through the locking body 8, and the bolt 4 is pulled up. When the bolt end 4b is pulled up to the upper limit position at a required distance from the notch 10a of the punch 10, the bolt shoulder 4c collides with the stopper 11. Therefore, from then on, a load is generated and the rotation transmission force to the fastening bolt 4 is cut off by the detachment of the locking body 8, and the bolt rotates idly, so that it is immediately possible to know that the bolt has been pulled up completely.

(effect) The present invention has the following unique effects.

The bolt can be fastened or unfastened with a constant torque simply by pushing in the fastening cap and rotating it in the fastening or loosening direction.

The screws are not tightened too strongly or too weakly, the appropriate torque is always obtained, and loosening can be reliably prevented.

Auto-locking and unlocking are performed by pressing the locking cap with one touch, making the operation easy.

When loosening a fastening bolt and replacing a tool such as a punch, you can confirm that the bolt has been pulled up using the stopper, so you can respond quickly.

It has a simple structure, reliable operation, and easy implementation.

(Example) Fig. 1 shows the case where the present invention is implemented in the heading part of a multi-stage former, in which the punches 10 of each stage are connected to the fastening cap 1 and fastening bolt 4 provided in the punch case (main body case 15). It is an auto-lock device. The same method can be applied to the side of the die 16 facing the punch 10.

The holder case 3 is integrally attached to the main body case 15 with set screws 17 such as screws. When installing the stopper 11, fix it with the set screw 17 at the same time.

As shown in FIGS. 3 and 4, the lock teeth 5 and 6 are formed in the shape of gears on the upper inner circumferential surface of the holder case 3 and the lower end outer circumferential surface of the fastening cap 1 so as to face each other from the inside to the outside. Also, as shown in FIG. 6, lock teeth 25, 26
They can also be formed to face each other vertically.

The locking body 8 presses the steel ball with the lock spring 7 so that the locking body 8 is fitted into an engaging portion 9 formed of a vertical groove of the bolt shaft portion 4a. A plurality of engaging portions 9 are provided at equal intervals around the circumference, and one or two of the engaging portions 9 are fitted, and the spring pressure can be adjusted using an adjusting screw 18.

Fig. 6 shows the case where no stopper is provided, but in this case, the upper end of the bolt shaft 4a is connected to the fastening cap 1.
or the bolt shoulder 4
c can be confirmed by coming into contact with the lower end of the fastening cap 1.

The fastening cap 1 is provided with a hexagonal head 1b at the top and a cylindrical portion 1c below the hexagonal head 1b, and the cylindrical portion is provided with a knurl to serve as a finger rest so that it can be operated with a spanner or manually. As shown in FIG. 6, if the cylindrical portion 1c is made larger in diameter than the holder case 3 so as to surround the entire cylindrical portion 1c, it is possible to prevent dirt, dust, water, etc. from entering.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, the first
The figure is a plan view of the forging part of the multi-stage former, Figure 2 is an enlarged longitudinal sectional side view of the punch attachment part, and Figures 3 and 4 are enlarged sectional views of the device of the present invention, the former being after tightening, and the latter being after tightening. Indicates the previous state. Fig. 5 is a sectional view taken from line A-A in Fig. 4, Fig. 6 is a sectional view of the second embodiment, Fig. 7 is a sectional view of the bolt shaft, and Fig. 8 is a sectional view of the conventional punch fastening part. FIG. 1...Tightening cap, 2...Lock spring, 3...
...Holder case, 4...Tightening bolt, 5, 6...
Lock tooth, 7...spring, 8...locking body, 9...engaging portion, 11...stopper.

Claims (1)

[Scope of claim for utility model registration] (1) In a device in which a tool such as a punch or die is inserted into a main body case and tightened with a fastening bolt,
A hollow cylindrical holder case that is integrally and immovably screwed to the bolt fastening part of the main body case, and a bolt that is fitted into this holder case and is set to be able to be pushed in and rotated by applying spring pressure from inside. It consists of a fastening cap for rotational operation,
When the fastening cap is under no load, the rotation is transmitted through a locking body that is elastically fitted into an engaging portion formed by a vertical groove under spring pressure, and when a load is applied, the locking cap is disengaged and rotates idly. It is characterized in that it is provided with locking teeth for auto-locking, which are fitted into the shaft portion of the fastening bolt and which are made of engaging teeth that engage with each other so as to separate when the fastening cap is pushed into the fastening cap and the holder case. Auto-lock screw mechanism for homeers etc. (2) The scope of the utility model registration claim characterized in that the holder case is provided with a stopper so that when the fastening bolt is loosened, it collides with the shoulder of the bolt at the upper limit position and then rotates idly. An auto-lock screw-fastening mechanism such as a homer as described in item 1. (3) An auto-lock screw fastening mechanism for a homer or the like, characterized in that the fastening cap is provided with a square head for rotation operation using a spanner or the like and a cylindrical part for manual operation. (4) The auto-lock screwing mechanism for a homer or the like according to claim 1 of the above-mentioned utility model registration, wherein the engaging portion corresponding to the engaging body is configured as a spline groove.