JPS6131330B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spring elasticity adjusting device for a clutch device, and more specifically, for example, in a spring elasticity adjusting mechanism of a clutch device configured to press a clutch plate with a spring, A gap adjusting ring with a different thickness is interposed in a replaceable manner so that a constant spring elasticity can be easily obtained at all times.

There is a device that is configured to be pressed by a predetermined elasticity of a spring, and when a mechanical force in the opposite direction exceeding the pressing elasticity is applied, the pressed object is moved backward and the mechanical engagement force is released. For example, patent application No. 52-81381 (Patent Publication No. 60-13798
The clutch-type electric screwdriver, which has been filed as
In order to achieve continuous tightening work with the optimum tightening force, as shown in FIG. an extension spring 18 that abuts the end of the clutch sleeve 16 inserted therein;
configured to be able to be pressed by the nut 10,
By rotating the knurled nut 10, the spring 1 is moved forward and backward in the axial direction of the interior member 14.
The elasticity of the clutch sleeve 8 is adjusted, and when the optimum tightening force is obtained, the clutch sleeve 16 is operated to cut off power transmission. In this case, the set value of the spring elasticity by adjusting the forward and backward movement of the nut 10 is displayed on a scale (not shown). The operator can feel the sliding sound when the groove is clicked into engagement.

However, according to such a spring elasticity adjustment mechanism, if the nut 10 is not set to the optimal working elasticity value, the setting must be reset every time a worker changes, and adjustment using a scale is only a guideline. Since the elasticity setting value does not exceed the range, there is a deviation in the elasticity setting value, and therefore, there is an inconvenience that the same setting value cannot always be obtained no matter who sets it.
For this reason, for example, even if the parent company instructs subcontractors in advance to set the bolt tightening force during product assembly,
Since the appropriate tightening force is not always obtained, complaints may arise due to the bolt becoming loose or the object to be tightened being damaged at a later date.

Therefore, the inventor was fully aware of the existence of the above-mentioned drawbacks, and as a result of repeated research and prototyping in order to obtain an adjustment device that can always obtain the spring elasticity value as instructed, no matter who is working on it, the inventor has developed a system that allows interior components to have a predetermined thickness. By inserting a gap adjustment ring and fully tightening the knurled nut until it abuts the ring, the optimal spring elasticity is achieved when the nut is stopped by the ring and cannot rotate any further. Therefore, it has been found that if a large number of gap adjusting rings of various thicknesses are prepared and made replaceable, it is possible to quickly respond to requests for setting a wide variety of spring elasticity values.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an adjusting device with a novel configuration that allows anyone to easily and reliably obtain a desired spring elasticity value in a clutch device that requires precise setting adjustment of spring elasticity.

In order to achieve the above object, the present invention provides a clutch device including a clutch sleeve having one end in contact with a clutch plate and the other end engaging a spring so that the elasticity can be adjusted. A cylindrical interior member is provided through which the clutch sleeve is inserted and a spring is inserted from the other end, and a screw groove having a click groove is screwed onto the outer periphery of the other end of the interior member via a stopper,
A gap adjustment ring is replaceably interposed on the outer periphery of the thread groove, and further includes a ball that can be screwed into the thread groove and fitted into the click groove, and is engaged with the other end of the spring to adjust the gap. A nut configured to clamp the ring between the ring and the stopper is provided.

Next, an embodiment of the spring elasticity adjusting device according to the present invention applied to a clutch device will be described in detail with reference to the accompanying drawings. In addition,
Components common to those shown in FIG. 1 are designated with the same reference numbers.

In FIG. 2, a stopper 11 and a thread groove 12 are provided around the outer periphery of a cylindrical interior member 14. As shown in FIG. A cap-shaped nut 10 having a knurled outer periphery is removably screwed into this thread groove 12. An annular groove 22 is provided around the nut 10, and a ball 26 with a diameter slightly larger than the diameter of this through hole is inserted into a through hole 24 formed in this groove 22, and then a partially cut annular band 28 is inserted. Said groove 22
The ball 26 is forcibly pressed by being elastically fitted into the ball 26. Therefore, it will be understood that the ball 26 is partially exposed inside the nut 10. Next, the clutch sleeve 16, which has a cylindrical shape and has a clutch tongue piece 32 at one end thereof, is inserted into the large diameter through hole 30 that opens in the axial direction of the interior member 14. Further, an extension spring 18 of a predetermined size is removably inserted into the through hole 30, and one end of this spring is attached to the clutch sleeve 1.
contact with the front end of 6. Furthermore, the interior member 1
A plurality of click grooves 34 are bored in the thread groove 12 in the axial direction. Note that in FIG. 2, reference numeral 38 indicates a protective case that houses the interior member 14.

Next, a gap adjustment ring 36 having a predetermined thickness in the axial direction is provided, and this ring is removably inserted into the outer circumference of the thread groove 12 of the interior member 14, and the nut 10 is inserted into the thread groove 12 as shown in FIG. Screw it in and continue its rotation. As a result, the nut 10 presses the gap adjustment ring 36 in the axial direction, and when it is clamped between it and the stopper 11 and fully tightened, it cannot rotate any further. In this case, the nut 10 contacts and presses the other end of the spring 18, thereby forcing the clutch sleeve 16 toward a clutch surface (not shown). Further, when the nut 10 is rotated, the ball 26 partially exposed inside the nut 10 repeatedly engages and disengages from the click groove 34 of the interior member 14, producing a light click sound.

In this manner, when the nut 10 is fully tightened and cannot be rotated any further, it indicates that the setting of the optimum spring elasticity value is completed when the specified gap adjustment ring 36 is used. Therefore, anyone can easily and reliably obtain an accurate spring elasticity value by instructing the user to use a gap adjusting ring of several millimeters thick. The greater the thickness of the gap adjustment ring in the axial direction, the weaker the set spring elasticity value, and conversely, the smaller the ring thickness, the stronger the set spring elasticity value.
Therefore, by preparing gap adjustment rings of several different thicknesses and using them singly or in combination, it is possible to meet the needs for setting many spring elasticity values. For example, "To tighten with torque 2, use the No. 2 ring,""To tighten with torque 3, use the No. 3 ring," or "To tighten with torque 5, use the No. 2 ring." Anyone can always achieve accurate torque management by instructing them to use the No. 3 and No. 3 rings one on top of the other.

As described above, when the present invention is applied to the clutch device of an electric screwdriver, the gap adjustment ring is adapted to a certain torque value, so that by simply replacing it, it is possible to extremely easily and reliably obtain accurate torque. This makes it possible to set a spring elasticity value that matches the spring elasticity value, which greatly contributes to improving work efficiency.

Although the spring elasticity adjusting device according to the present invention has been described above with reference to preferred embodiments, the present invention is not limited thereto, and many improvements and changes can be made within the spirit of the invention. be.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a conventional spring elasticity adjusting device, FIG. 2 is an exploded perspective view showing an embodiment of the spring elasticity adjusting device according to the present invention, and FIG.
This figure is a side view showing the assembled state of the apparatus shown in FIG. 2. 10... Nut, 12... Thread groove, 14... Interior member, 16... Clutch sleeve, 18... Spring, 22... Annular groove, 24... Through hole, 2
6... Ball, 28... Annular band, 30... Through hole, 32... Clutch tongue piece, 34... Click groove, 36... Gap adjustment ring, 38... Protective case.

Claims (1)

[Claims] 1. In a clutch device equipped with a clutch sleeve configured such that one end abuts a clutch plate and the other end engages a spring so that the elasticity can be adjusted, the clutch sleeve is inserted from one end and the spring is inserted from the other end. A cylindrical interior member to be inserted is provided, a screw groove having a click groove is screwed onto the outer periphery of the other end of the interior member via a stopper,
A gap adjustment ring is replaceably interposed on the outer periphery of the thread groove, and further includes a ball that can be screwed into the thread groove and fitted into the click groove, and is engaged with the other end of the spring to adjust the gap. A spring elasticity adjusting device for a clutch device, comprising a nut configured to clamp a ring between the ring and the stopper.