JPH0351548Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement in a rotating shaft that can be rotated manually by a handle or the like as well as forcibly driven rotation by a mechanical force such as a motor.

[Prior art]

A rotating shaft equipped with a drive device that forcibly rotates it using mechanical force such as a motor and a handle so that it can be rotated by hand is often used as an adjustment shaft for various machines, and as a drive shaft for opening and closing valves, etc. It is used. In principle, a structure is adopted in which the handle is rotatable when driven by a motor, and the motor-side transmission shaft is rotatable when the handle is rotated by hand. In the former case, this is a safety measure since rotating the manual handle is dangerous, and in the latter case, this is a measure to reduce the load torque on the manual handle.

[Problem that the invention attempts to solve]

However, when a rotating shaft having such a configuration is rotated by a motor, the manual handle may sometimes rotate together (co-rotating), although this is not mandatory, and this may even be dangerous. In other words, basically, when the device is driven by a motor, the manual handle can be rotated idly, so it can be said that it should not rotate, but in reality, the bearing between the rotating shaft and the handle is a ball bearing, etc. However, there is still some frictional resistance.

For this reason, the handle gradually begins to rotate as the rotating shaft is rotated by the motor, and may eventually reach a considerable rotational speed. If your hands, fingers, etc. touch the handle while it is rotating at high speed, there is a high risk of injury due to the inertial energy. Furthermore, if this rotating shaft is connected to a shaft that performs precise positioning or adjustment, the inertial rotation of the handle may adversely affect the accuracy.

The present invention was devised in view of the above-mentioned conventional problems, and aims to provide a rotary shaft drive device that prevents the manual handle from turning even when forcedly driven by a motor, etc., by means of a simple construction. shall be.

[Means for solving problems]

In order to achieve the above object, this invention provides a rotary shaft rotatably supported by a holder and connectable to a motor via a clutch, and a rotary shaft rotatably supported on the rotary shaft so as to be movable in the axial direction. A meshing clutch is provided on the handle and the rotating shaft, and the handle is provided with an engaging portion that engages with a locking device provided on the holder when the meshing clutch is disengaged and the handle is moved to a standby position. The handle is fixed to the holder.

[Effect]

In the above configuration, the rotating shaft can be rotated by the motor by connecting the clutch,
Further, by moving the handle and engaging the dog clutch, the rotating shaft can also be rotated using the handle. As mentioned above, when the rotating shaft is rotated by the motor, the handle is in the standby position and the engaging part provided on the handle engages with the locking device provided on the holder and is locked and fixed to the holder. This prevents the handle from rotating when the rotating shaft rotates, which further improves safety.

〔Example〕

Hereinafter, one embodiment of the apparatus of the present invention will be described with reference to the drawings of FIGS. 1 to 3.

A vertical rotating shaft 5 rotatably supported by a cylindrical holder 1 via a bearing 3 rotates a spindle of a ram stroke adjustment mechanism of a hydraulic press brake (not shown) via a transmission gear (not shown) at the upper end. It's becoming like that. The rotating shaft 5 is driven and rotated by a geared motor 7 with a built-in clutch as a driving device, and can also be driven manually by a handle 9 provided at the lower end of the rotating shaft 5. In this case, the driving device by the motor 7 is separated by a built-in clutch, so that the handle 9 can be easily rotated by hand.

The handle 9 is rotationally engaged with the rotation shaft 5 via a dog clutch 11 near the lower end of the rotation shaft 5. That is, one member 11a of the dog clutch 11
is fixed to the rotating shaft 5 side, and the other member 11b of the dog clutch is integrally molded on the upper surface side of the boss portion of the handle 9. The handle 9 is fitted onto the rotating shaft 5 via a special linear ball bearing, and is mounted so as to be rotatable and movable in the axial direction. One member 13a of a meshing clutch 13, which is an example of a locking device, is integrally formed on the boss portion on the lower surface of the handle 9, and the upper surface of the flange 15 on the lower end portion on the holder 1 side. The other member 13b of the dog clutch 13 is formed.

Since the handle 9 is configured as described above, when the handle 9 is slid upward and rotated, the dog clutch 11 is engaged and the rotating shaft 5 is driven. Then, when the rotation of the handle 9 is stopped and the hand is released, the handle 9 falls downward by its own weight. When the handle 7 descends until it comes into contact with the surface of the flange 15 at the lower end of the holder 1, the handle 7 is located at the lowest position as the standby position and the flange 15 is moved downward.
The engagement clutches 13a and 13b formed on the upper surface and the lower surface of the boss of the handle 9 are engaged to be in a rotationally locked state. That is, the handle 9 is fixed by the dog clutch 13 and cannot be rotated.

Therefore, in this state, even if the rotating shaft 5 is forcibly rotated by the drive device using the motor 7, the handle 9
It is possible to completely prevent the system from spinning around as it did in the past.

Next, FIG. 2 shows another embodiment of the apparatus of the present invention. This uses a rubber ring 17 as a locking device when the handle 9 is moved back, that is, when it is lowered to the lowest position in FIG. 2 and placed in the standby position. That is, a rubber ring 17 is adhered and fixed to the upper surface of the flange 15 that is in contact with the lower surface of the boss of the handle 9, and the high frictional resistance when the rubber ring 17 and the engaging portion of the lower surface of the sleeve boss of the handle 9 come into contact is reduced. Used for locking action. If the frictional resistance of this portion is greater than the frictional resistance of the special linear ball bearing between the rotating shaft 5 and the handle 9, the dragging phenomenon can be prevented.

Next, FIG. 3 shows another embodiment of the apparatus of the present invention. This uses a check ball mechanism 19 as a locking device for the handle 9 in the standby position as described above. Circular recesses 21 or grooves are carved at a predetermined pitch on the outer peripheral surface of the boss portion of the handle 9 as engaging portions, and the ball 2 is fitted into the recesses 21.
3 and a pressing spring 25 is provided within the cross section of the flange 15 at the lower end of the holder 1 in a direction perpendicular to the axis of the handle 9.
The effects and the like in this case are the same as those in the embodiment described above, and a description thereof will be omitted.

The rotary shaft drive device of the present invention is not limited to the above-mentioned embodiments, and can be further modified and applied in various ways. For example, the outer periphery of the boss portion of the handle placed in the standby position may be pressed and locked by a leaf spring or the like provided on the outside. Furthermore, it goes without saying that the present invention can be similarly applied when the rotation axis is in a horizontal or oblique position other than in a vertical position. In these cases, it can be easily returned to the standby position without using the handle by using a spring or the like instead of the gravity.

[Effect of idea]

As can be understood from the above description of the embodiments, in short, the present invention provides a rotary shaft 5 which is rotatably supported by a holder 1 and is connectable to a motor 7 via a clutch. A dog clutch 11 that can be engaged and disengaged is provided between a handle 9 that is freely and axially movably supported and a rotary shaft 5, and when the dog clutch 11 is disengaged and the handle 9 is moved to a standby position, the holder is closed. The handle 9 is provided with an engaging portion that engages with the locking device provided in the holder 1, and the handle 9 is fixed to the holder 1.

With the above configuration, according to the present invention, by connecting the clutch to connect the motor 7 and the rotating shaft 5, the motor 7 can also rotate the rotating shaft 5, and the clutch can be disengaged. By moving the handle 9 from the standby position and engaging the dog clutch 11, the rotating shaft 5 can be rotated using the handle 9.

As described above, when the rotary shaft 5 is rotated by the motor 7, the handle 9 is in the standby position and the engaging portion provided on the handle 9 engages with the locking device provided on the holder 1 and is locked and fixed to the holder 1. Therefore, it is safe because it does not rotate in conjunction with the rotation of the rotating shaft 5.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view of one embodiment of the device of the present invention, FIG. 2 is a sectional view of a main part of another embodiment, and FIG. 3 is a sectional view of a main part of another embodiment. 5... Rotating shaft, 9... Hand crank, 11...
...Matching clutch, 13...Matching clutch (locking means), 17...Rubber ring (same as above), 19
...Check ball (same as above).

Claims (1)

[Scope of utility model registration request] A rotary shaft 5 rotatably supported by the holder 1 is provided so as to be connectable to a motor 7 via a clutch, and a handle 9 rotatably and axially movably supported by the rotary shaft 5 meshes with the rotary shaft 5. A removable meshing clutch 11 is provided, and the handle 9 is provided with an engaging portion that engages with a locking device provided on the holder 1 when the meshing clutch 11 is disengaged and the handle 9 is moved to a standby position. A rotary shaft drive device characterized in that the handle 9 is fixed to the holder 1.