JPS6338964Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field: Cutting equipment, polishing equipment, etc. operated by electric motors.
This device relates to a device for fastening and releasing a fastened object, such as an accessory tool or a power transmission mechanism via a shaft, which is removably connected to other article processing equipment, and in the present invention, it is firmly fastened. This is particularly aimed at being able to release a locked object with a small release force.

BACKGROUND ART Conventionally, there have been various devices for releasing fastening of fastened objects used in cutting devices, polishing devices, other article processing devices, and power transmission mechanisms, which are relatively small devices and have small electric motor power. The tightening force was also satisfactory compared to the rotational force of the electric motor. However, in heavy cutting, heavy polishing, power transmission of large force, etc., where the rotational force of the electric motor is large and the resistance applied to the adhered object is large, the clamping force is small, so it is difficult to tighten the clamped object such as a cutting bar. This has the disadvantage that sliding or coming off occurs between the attached parts. In order to eliminate this drawback, if the spring, etc. that obtains the clamping force is made to have a strong restoring force, it will be difficult to release the clamping force, which will cause problems in replacing objects to be clamped, such as cutting bars. .

Problems to be Solved by the Invention This invention attempts to solve the above-mentioned problems, and is intended to solve the problems described above. Of course, it can be used as a device for releasing the fastening of fastened objects used in transmission mechanisms, etc., but also for heavy cutting, heavy polishing, power transmission of large force, etc. where the rotational force of the electric motor is large and the resistance applied to the fastened objects is large. Even if a spring or the like is used to generate a sufficiently large clamping force, the clamping force can be easily released with a small force when replacing an object to be clamped, such as a cutting bar. It is.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a tapered surface on the outer periphery of the clamping claw through which the object to be fastened can be inserted into the center, and a sliding surface corresponding to the tapered surface. An inner cylinder having a tapered surface on the inner periphery is slidably positioned on the outer periphery of the fastening claw and is pressed in the tightening direction of the fastening claw by a fastening spring, and is provided at one end of this inner cylinder. A pressing body is provided that faces the boosting tapered surface and is always located without pressing the inner cylinder and moves only in the direction intersecting the axial direction of the object to be fastened. An outer circumferential cylinder is provided so that its pressing tapered surface faces the pressing body, and is positioned so as not to press the pressing body at all times, so as to be able to slide in the axial direction. It is pressed in the plane direction and is positioned so that the inner cylinder, which is normally pressed in the fastening direction by the fastening spring, can be pushed in the direction of unfastening against the restoring force of the fastening spring by a pressing body. It is.

Function The present invention is constructed as described above, and its function will be explained with reference to Fig. 2, which diagrammatically depicts the above construction for convenience of explanation. The pressing force F1 acts as a force F2 that presses the pressing body against the boosting tapered surface. this power
If F2 is the inclination angle θ ₁ of the pressing tapered surface, then F2=F1/tan θ ₁ .

Further, the pressing force F2 on the inner cylinder acts as a force F3 that presses the inner cylinder in the direction of the fastening claw. This force F3 becomes F3=F2/ _tanθ2 , where _θ2 is the inclination angle of the boosting tapered surface.

Therefore, if the inclination angle of the pressing tapered surface is
15°, and the inclination angle of the boosting taper surface is 30°, then F3 = F1 / tan15° x tan30° = F1 x 6.46, and the pressing force of the outer cylinder with fingers is theoretically
6.46 times the movement force of the inner cylinder in the tightening direction of the clamping claw, and even if the pressing force of the inner cylinder against the clamping claw is extremely large, it will be 1/6.45 of this large inner cylinder pressing force. It is theoretically possible to release the pressing force on the inner cylinder with the force of . Further, the direction in which the outer cylinder is pressed by the fingers, etc. and the direction in which the inner cylinder is pressed may be in the same direction as shown in Fig. 2, or in opposite directions as shown in Fig. 3, depending on the design convenience. can be determined.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a rotating shaft which is connected to an electric motor and rotates.A casing 3 is fixed to the outer periphery via a bearing 2. A covering tube 6 is screwed and fixed to the outer periphery of the coil spring 3 with an insertion interval 5 between the coil springs 4. Further, one end of a cylindrical fastening body 7 is screwed and fixed to the inner periphery of the rotating shaft 1, and this fastening body 7
A fastening claw 10 is provided with a split groove 8 from the edge toward the other end.
An insertion interval is formed in the direction of the central axis of the clamping claw 10 through which the object 11 to be clamped, such as a cutting bar, can be inserted, and a tapered surface 12 is formed on the outer periphery of the clamping claw 10. An inner cylinder 14 is provided with a sliding tapered surface 13 corresponding to this tapered surface 12 on its inner periphery.
The outer periphery of the fastening claw 10 is biased by a fastening spring 15 so that the fastening claw 10 can slide in the fastening direction. This fastening spring 15 has a strong fastening force to prevent sliding or coming off between the fastened object 11 and the fastening pawl 10 even when strong resistance occurs to the rotation of the fastened object 11. It is desirable that the inner cylinder 14 has a restoring force sufficient to generate the same, and a boosting tapered surface 16 is provided at one end of the inner cylinder 14 in the urging direction. For manufacturing reasons, this boosting tapered surface 16 is formed separately from the portion where the sliding tapered surface 13 is provided, but it is of course possible to form them integrally. Further, a pressing body 17 made of a steel ball located in contact with this boosting tapered surface 16 is inserted into an engaging opening 18 opened at appropriate intervals in the rotating shaft 1, and is inserted in a direction intersecting the axial direction of the object 11 to be fastened. The inner cylinder 14 is normally positioned facing the boosting tapered surface 16 so as not to press the inner cylinder 14 in the tightening direction of the tightening claw 10. An outer cylinder 20 is placed on the outer surface of the pressing body 17, and the pressing body 17 is positioned so as to face the pressing tapered surface 21 on the inner circumference of the outer cylinder 20. Normally, the pressing body 17 is doubled by the pressing tapered surface 21. Force tapered surface 16
The outer cylinder 2 is
0 is constantly pressed in the axial direction, and this outer cylinder 20 is provided on the rotating shaft 1 so as to be slidable in the axial direction. Moreover, one end is attached to the outer periphery of this outer circumferential cylinder 20 with a casing 3.
A top cover 23 slidably inserted into an insertion interval 5 on the outer periphery is biased by a coil spring 4 and positioned, and a release protrusion 24 provided at the tip of the top cover 23 is positioned.
is located at an appropriate non-contact interval 27 from the urging direction end 26 of the outer cylinder 20 that abuts against the fixed sleeve 25, and is provided on the outer periphery of the rotary shaft 1 so as to be slidable in the axial direction, and the top cover 23 At the time of pressing and sliding, the pressing tapered surface 21 presses the pressing body 17 in the direction of the boosting tapered surface 16, and the internal cylinder 14, which is normally pressed in the tightening direction by the fastening spring 15, is tightened by the pressing body 17. It is positioned so that it can be pressed in the direction of releasing the fastening against the restoring force of the spring 15.

In the configuration as described above, the force for releasing the fastening by the outer cylinder 20 on the fastening pawl 10 will be explained based on specific values in one embodiment.The spring load of the coil spring 4 is 0.3. Kg, the spring load of the biasing spring 22 is 0.2Kg, the pressing force of the top cover 23 with fingers is 2Kg, the inclination angle of the pressing tapered surface 21 is 10°, and the inclination angle of the boosting tapered surface 16 is 30°. The force that presses the cylinder 14 in the unfastening direction is F3 = 2-0.3-0.2/tan10° x tan30° = 14.7 14.7Kg using the following formula.

Therefore, sliding with fingers is normally difficult.
Even if the fastening spring 15 has a restoring force of about 10 kg, the release of the fastening force will be large compared to the fastening force, so the fastening force can be easily released with an extremely small force. .

Effects of the invention The present invention is constructed as described above, and is a relatively small device that uses a small electric motor to fasten objects used in cutting devices, polishing devices, other article processing devices, power transmission mechanisms, etc. Not only can it be used as a release device, but it can also be used in heavy cutting, heavy polishing, power transmission of large force, etc. where the rotational force of the electric motor is large and the resistance applied to the object to be fastened is large. Even when using a cutting bar or the like, the clamping force can be easily released with a small force when replacing an object to be clamped such as a cutting bar.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view, FIG. 2 is an explanatory diagram showing a pressing force transmission process, and FIG. 3 is an explanatory diagram showing another different pressing force transmission process. . 10... Tightening claw, 11... Object to be fastened, 12...
Tapered surface, 13... Sliding tapered surface, 14...
Inner cylinder, 15... Tightening spring, 17... Pressing body, 16
... Boosting tapered surface, 20 ... Outer cylinder, 21 ...
Press tapered surface.

Claims (1)

[Scope of utility model registration request] A tapered surface is provided on the outer periphery of the clamping claw that allows the object to be fastened to be inserted through the center part, and an inner cylinder with a sliding tapered surface on the inner periphery that corresponds to this tapered surface can be slid on the outer periphery of the clamping claw. The inner cylinder is normally positioned without pressing the inner cylinder, and is pressed in the tightening direction of the clamping pawl by the tightening spring, facing the boosting taper surface provided at one end of the inner cylinder. A pressing body is provided that moves only in the direction intersecting the axial direction of the fastener,
An outer circumferential cylinder is located on the outer periphery of this pressing body, with the pressing tapered surface of the inner circumference facing the pressing body, and is positioned so as not to press the pressing body at all times. At the same time, press the pressing body with the pressing tapered surface in the direction of the boosting tapered surface,
A fastening release device characterized in that the inner cylinder, which is normally pressed in the fastening direction by the fastening spring, can be pushed in the fastening release direction by a pressing body against the restoring force of the fastening spring. .