JP2749553B2 - Fastening structure between torsion bar and pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening structure for fastening a torsion bar to an object to be fastened such as a pipe which rotates following the rotational force of the torsion bar. The present invention relates to a fastening structure of a pipe and a torsion bar for fastening a lower end of a wire rod inside a pipe to be fastened.

The inventor of the present application has developed a viscometer that uses a torsion bar (specifically, a piano wire) to detect the viscosity of a viscous liquid such as an adhesive or a filler by the amount of twist of the torsion bar. ing.

The structure of this viscometer will be described with reference to FIGS. 4 and 5. Reference numeral 1 denotes a viscometer, and the viscometer 1 is supported by a support 3 which is vertically erected by a stand base 2. And vertically supported by a support rod 5. Then, from the lower surface of the viscometer 1, a cylindrical output shaft 6 is provided.
In addition, the lower end of the output shaft 6 is connected to a spindle 8 to which an impeller 7 is attached.

As shown in FIG. 1, the viscometer 1 has a cylindrical drive shaft 11 which is rotated at an appropriate rotation speed by a rotation of a motor 9 via a speed reduction mechanism 10 as shown in FIG.
The inner central position of the drive shaft 11 and the inner central position of the output shaft 6 are connected by a piano wire 12 having a function of a torsion bar, and the output shaft 6 is connected via the piano wire 12. , And is suspended by the drive shaft 11 in a hanging state. Further, a scale plate 13 is provided at the lower end of the drive shaft 11.
A pointer 14 corresponding to the scale plate 13 is fixed to the upper end of the output shaft 6.

In order to measure the viscosity of the viscous liquid with the viscometer having the above configuration, the spindle 8 is immersed in a viscous liquid in a beaker 15 containing a viscous liquid as a sample.
Then, the motor 9 is driven.

The driving force of the motor 9 causes the drive shaft 11 to rotate at an appropriate speed via the speed reduction mechanism 10. As a result, the piano wire 12 and the scale 13 rotate at the same speed as the drive shaft 11. The output shaft 6 that is suspended from the drive shaft 11 via the piano wire 12 also tries to rotate at a constant speed following the rotation of the drive shaft 11, but the impeller 7 provided on the spindle 8 has The output shaft 6
Receives the load of the viscous liquid, the output shaft 6 rotates following the drive shaft 11 with a delay due to the twisting action of the piano wire 12, and the amount of the delay corresponds to the scale plate 13 and the pointer 14. Is displayed as viscosity in the relative positional relationship of.

In such a viscometer, as described above, the lower end of the piano wire 12 as a torsion bar is
At the center position inside the cylindrical output shaft 6, a piano wire 12
The conventional fastening means for fixing the output shaft 6 and the piano wire 12 so that the length position can be adjusted is, for example, a fastening structure as shown in FIGS. there were.

In the conventional example shown in FIG. 6, a slit member 1 having an axial slit 16 inside a cylindrical output shaft 6 is provided.
7, and the piano wire 12 is inserted into the central shaft hole 18 of the slit member 17.
Are fastened in the radial direction of the output shaft 6 with two fastening screws 19
By tightening the slit 16 so that the slit width of the slit 16 is narrowed, the output shaft 6 and the piano wire 12 are
It is integrally connected via a slit member 17.

In the conventional example shown in FIG. 7, a pair of claw members 17A and 17B, which are split, are fitted inside the cylindrical output shaft 6 and a piano wire 12 is inserted between the pair of claw members 17A and 17B. Between the two claw members 17A, 17B.
Are fastened in the radial direction of the output shaft 6 with two fastening screws 19
The output shaft 6 and the piano wire 12 are integrally connected to each other via the two claw members 17A and 17B by fastening the two claw members 17A and 17B so as to approach each other.

[0010]

However, in the conventional fixing means, the fastening force of the fastening screw 19 penetrating the thick portion of the output shaft 6 in the radial direction is used.
The output shaft 6 needs a sufficient thickness to screw the fastening screw 19. The outer diameter of the cylindrical output shaft 6 which secures a sufficient wall thickness naturally increases, and as in the case of the output shaft 6 used in the viscometer, an extremely thin tube having an outer diameter of about 6 mm is used. In the case of an output shaft having a shape like this, it was impossible to adopt fixing means having a conventional structure as shown in FIGS.

It is also conceivable that the cylindrical output shaft 6 and the piano wire inserted into the output shaft are fixed using an adhesive. It became impossible to adjust the length of the wire, and the practicality was lacking.

The present invention has been made by paying attention to such conventional fixing means, and a torsion bar positioned on an inner central axis of a relatively thin pipe member is easily and securely fastened inside the pipe member. An object of the present invention is to provide a fastening structure between a torsion bar and a pipe, which can easily adjust the length of a torsion bar to be fastened to a pipe member as necessary.

[0013]

In order to achieve the above object, according to the present invention, there is provided a fastening structure for integrally fastening a lower end portion of a torsion bar with the pipe on an internal central axis of the pipe. A female screw is engraved on the inner diameter surface of the chuck base, and a chuck base having a tapered hole is screwed along the central axis direction using the female screw, and the chuck engaged in the tapered hole of the chuck base is: A central hole formed along the central axis of the chuck and through which the torsion bar can be inserted, a tapered shaft portion engaged in the tapered hole, and the tapered shaft portion in the circumferential direction. Equally divided, having an axial slit forming a plurality of holding pieces,
After the end of the torsion bar is inserted into the center hole of the chuck, the tapered shaft of the chuck is fitted into the tapered hole of the chuck base, and the torsion bar and the pipe are used to press the torsion bar with each holding piece. It is characterized by a fastening structure.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in FIGS.

In this embodiment, as shown in FIG. 1, the lower end of the torsion bar, ie, the lower end of the piano wire 12 incorporated in the viscometer described in FIG.
An embodiment will be described in which the inside is fastened.

A female screw 2 is provided on the inner peripheral surface of the cylindrical output shaft 6.
The female screw 21 is screwed with a male screw 24 formed on the outer peripheral surface of a cylindrical chuck base 22 and a chuck 23, and the chuck base 22 and the chuck 23 are provided in the output shaft 6. Is screwed.

As shown in FIG. 2, the shape of the chuck base 22 is such that a tapered hole 25 is penetrated along the center axis thereof, and the chuck base 22 extends from one end of the chuck base 22 to the other end in the generatrix direction. A slit 26 is formed, and a tool engagement groove 27 for engaging a tool such as a driver is formed at both ends of the chuck base 22.

As shown in FIG. 3, the chuck 23 has a center hole 28 formed along the center axis thereof, and has a tapered shaft portion 29 fitted in the tapered hole 25 of the chuck base 22. Have. This tapered shaft portion 29
Has an axial slit 31 for equally dividing the tapered shaft portion in the circumferential direction to form a plurality of holding pieces 30. Further, a tool engagement groove 32 for engaging a tool such as a driver is formed at an end of the chuck 23 opposite to the tapered shaft portion 29.

Next, the operation of fastening the output shaft 6 to the piano wire 12 using the chuck base 22 and the chuck 23 will be described.

First, a male screw 24 provided on the outer periphery of the chuck base 22 is screwed with a female screw 21 formed on the inner peripheral surface of the output shaft 6, and a tool such as a driver is inserted into the tool engagement groove 27. , And the chuck base 22 is screwed to an appropriate position in the output shaft 6 by the rotation of the tool. Next, after the lower end of the piano wire 12 is inserted into the slit 31 and the center hole 28 of the chuck 23, the orientation of the chuck 23 is adjusted so that the tapered shaft portion 29 of the chuck 23 enters the tapered hole 25 of the chuck base 22. Is determined, the tool is engaged in the tool engagement groove 32 while being screwed with the male screw 24 of the chuck 23 and the female screw 21 of the output shaft 6, and the rotation of the tool causes the chuck 23 to rotate the output shaft 6. While being screwed into the taper shaft portion 2 of the chuck 23.
9 is pushed into the tapered hole 25 of the chuck base 22. As a result, the clamping force of the piano wire 12 by the plurality of holding pieces 30 is increased, and at the same time, the chuck base 22 is pushed out by the slits 26, and the coupling force between the chuck base 22 and the output shaft 6 is increased.
Numeral 2 is fastened on the center axis of the output shaft 6 via the chuck base 22 and the chuck 23.

When it is desired to adjust the length of the piano wire 12, if the chuck 23 is loosened with respect to the chuck base 22, the clamping force of the piano wire 12 by each of the holding pieces 30 is weakened. The displacement of the chuck 23 can be adjusted in the axial direction. In the above-described embodiment, the piano wire 12 has been described as an example of the torsion bar. However, the torsion bar is not limited to the piano wire, and can be twisted in the radial direction. There may be.

[0022]

As described above, according to the present invention, the chuck base 22 having the tapered hole is screwed into the inside of the cylindrical output shaft.
Further, the tapered hole of the chuck base 22 has a tapered shaft portion 2 of the chuck for holding the torsion bar on the center axis.
9 is press-fitted to fasten the torsion bar and the output shaft. Therefore, the fastening between the torsion bar and the output shaft is performed by a simple fastening operation of screwing the chuck base and the chuck into the cylindrical output shaft. Can be secured.
In particular, according to the fastening structure of the present invention, it is possible to easily and surely fasten the torsion bar to the inside of the cylindrical output shaft whose outer diameter is, for example, about 6 mm.

Further, according to the present invention, the length of the torsion bar can be freely adjusted by a simple operation of loosening the fastening force by the chuck 23, thereby facilitating the torque adjustment. Further, in the present invention, by using the cylindrical chuck base and the chuck, the inner central axis of the cylindrical output shaft and the central axis of the torsion bar can be made to coincide with each other, whereby the rotational force of the output shaft is reduced. The effect of being able to transmit effectively as torsion is obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment showing a fastening structure of a torsion bar and a pipe according to the present invention.

FIGS. 2A, 2B, 2C, and 2D are a side view, a central longitudinal sectional view, a plan view, and a bottom view of the chuck base according to the embodiment.

FIGS. 3A, 3B, 3C, and 3D are a side view, a central longitudinal sectional view, a plan view, and a bottom view of the chuck according to the embodiment.

FIG. 4 is an explanatory view showing the overall structure of a viscometer device.

FIG. 5 is an explanatory view showing the internal structure of the viscometer itself.

FIGS. 6A and 6B are a plan view and a sectional view showing a conventional torsion bar fastening structure, respectively.

7A and 7B are a plan view and a sectional view showing another conventional torsion bar fastening structure, respectively.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 21 ... Female screw 22 ... Chuck base 23 ... Chuck 24 ... Male screw 25 ... Tapered hole 26 ... Slit 27 ... Tool engagement groove 28 ... Center hole 29 ... Tapered shaft part 30 ... Nipping piece 31 ... Slit 32 ... Tool engagement groove

Claims (1)

(57) [Claims] 1. A fastening structure for fastening a lower end of a torsion bar integrally with a pipe on an inner central axis of the pipe, wherein a female screw (21) is engraved on an inner diameter surface of the pipe,
The female screw (21) is used to screw a chuck base (22) having a tapered hole (25) along the center axis direction, and the tapered hole (2) of the chuck base (22) is screwed.
The chuck (23) engaged in 5) is formed along the central axis of the chuck (23), and has a center hole (28) through which the torsion bar can be inserted, and the tapered hole (28). 25) tapered shaft (29) engaged in
And an axial slit (31) for equally dividing the tapered shaft portion (29) in the circumferential direction to form a plurality of holding pieces (30), and a central hole (28) of the chuck (23). )
Insert the end of the torsion bar into the chuck (2
3) A fastening structure between a torsion bar and a pipe, wherein the taper shaft portion (29) is fitted into the tapered hole of the chuck base (22), and the torsion bar is clamped by the clamping pieces (30).