JP3484673B2 - Traveling position correction mechanism for in-pipe work cart - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling position correcting mechanism incorporated in a bogie for automatically correcting the deviation of the traveling position of a bogie working in a pipe such as a sewer pipe.

[0002]

2. Description of the Related Art With the rapid development of the network society in recent years, in order to construct a large-scale and fine optical communication network connecting the homes with optical fiber cables at low cost and in a short construction period, the Various techniques for laying signal cables such as fibers have been proposed.

When the optical fiber cable is passed through the sewer pipe, the optical fiber cable is fixed directly to the upper part of the inner wall of the sewer pipe by a fixing tool, or the optical fiber cable can be easily laid when it is disconnected. A sheath pipe is fixed to the upper part of the inner wall of the sewer pipe by a fixture, and an optical fiber cable is inserted inside the sheath pipe.

A vinyl chloride pipe having an inner diameter of about 20 cm is used for the sewer pipe on which the optical fiber cable is laid, and the work of fixing the optical fiber cable and the sheath pipe inside is connected to both ends of the sewer pipe. From one of the manholes, a fixture for fixing the optical fiber cable directly to the inner wall of the sewer pipe and a special trolley designed for in-pipe work with a fixture for fixing the sheath pipe are put in the sewer pipe, Pull this trolley to the working position in the pipe from the other side manhole with a wire rope, etc., and attach the fixture to the inner wall of the sewer pipe by the fixture attachment mechanism equipped on the trolley to attach the optical fiber cable or sheath pipe. It is fixed to the upper part of the inner wall of the sewer pipe via a fixing tool.

[0005]

Such a trolley is constructed so that it can be moved in the sewer pipe by four traveling wheels provided in pairs at the left and right ends of the vehicle body in the longitudinal direction. Since the sewer pipe has a circular cross-sectional shape when it is towed by the car, if the traveling position of the traveling wheels of the bogie deviates in the lateral direction, the body of the bogie tilts and the fixture is attached to the inner wall of the sewer pipe. There was a problem that caused trouble.

In order to deal with such a problem, the inventors of the present invention provide a weight that can swing around the longitudinal axis of the vehicle body of a bogie, and when the vehicle body leans during traveling, four wheels are interlocked with it. We proposed a mechanism to correct the traveling position of the bogie by changing the direction so as to reduce the inclination all at once.

This mechanism transmits the relative swing displacement of the weight with respect to the vehicle body to a wheel supporting arm supporting wheels at both ends in the front and rear of the vehicle body via a link mechanism, and synchronizes both wheel supporting arms. The wheel is rotated around the vertical axis to change the direction of the traveling wheels.

However, when the vehicle is moved in the sewer pipe in the opposite direction and the vehicle body tilts and the weight swings relative to the vehicle body, each traveling wheel further increases the vehicle body inclination. Because it will face in the direction that makes it
There was a problem that the dolly could only be moved in one direction.

Therefore, the present invention solves the above-mentioned problems in the prior art, and automatically shifts the traveling position so as to restore the inclination of the vehicle body when the carriage is towed in either the front or rear direction. An object of the present invention is to provide a traveling position correcting mechanism of a bogie for in-pipe work that can be corrected.

[0010]

To achieve the above object, a traveling position correcting mechanism for a bogie for in-pipe work according to the present invention is configured to be rotatable about a vertical axis at the center of the vehicle body in the width direction and near both ends in the longitudinal direction. A pair of supported support shafts, a pair of wheel support arms in which traveling wheels are rotatably attached to both ends, and an intermediate portion is fixed to each support shaft, an axial displacement within a predetermined range and a rotation about an axis line. It is capable of dynamic displacement and is supported by the vehicle body above these support shafts so that the axis is oriented in the longitudinal direction of the vehicle body and orthogonal to the axes of the respective support shafts. The traction shaft has, a weight provided below the traction shaft so as to rotate integrally with the traction shaft about the axis of the traction shaft, and supports the rotational displacement of the traction shaft with respect to the vehicle body. With a pair of transmission means for transmitting to the shaft There.

In the traveling position correction mechanism, the pair of transmission means are respectively rotatable with respect to the vehicle body at a fixed position with the first bevel gear fixed to the upper end of the support shaft and the traction shaft at the center. A bevel gear, a second bevel gear and a third bevel gear that have the same number of teeth and are always meshed with the first bevel gear on both sides in the radial direction, and the traction shaft is pulled. When the strip body is axially displaced to one side of the second bevel gear and the third bevel gear by pulling the strip,
The bevel gear in the displacement direction and the traction shaft are coupled so as to rotate integrally, and the bevel gear and the traction shaft on the opposite side are provided with a coupling / separating means that allows relative rotation between the bevel gear and the traction shaft. The relative rotation of the weight with respect to the vehicle body causes the pair of wheel support arms to be synchronously rotated in a direction to return the inclination of the vehicle body to the traveling direction.

In the coupling / separating means, the second bevel gear and the third bevel gear are both coupled to the traction shaft to restrict rotation at a position where the traction shaft reaches both side limit positions of the axial displacement. Is desirable. Further, the coupling / separating means can be configured by using a key or a spline.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will now be described with reference to the drawings.
An embodiment will be described. FIG. 1 is a side view of a truck for in-pipe work (hereinafter simply referred to as a truck) equipped with a traveling position correcting mechanism of the present invention.
Is used for the work of fixing the sheath pipe 3 for inserting and holding the optical fiber cable to the upper part of the inner wall of the sewer pipe 2.

The trolley 1 has a pair of left and right traveling wheels 4 on the front and rear of the lower part of the vehicle body, and these traveling wheels 4 can travel inside the sewer pipe 2. Further, a connecting portion 5 is provided at each of a front end portion and a rear end portion of the bogie 1 in the traveling direction, and either one of the pulling line body 6 or the pulling line body 7 connected to the connection portion 5 is
The truck 1 can be moved to a work position in the sewer pipe 2 by being pulled by an operator who has entered a manhole (not shown) at the end of the sewer pipe 2. In addition, in this embodiment, the connecting portion 5 is composed of eyebolts, and a string is used for the towing lines 6 and 7, but the connecting part may have any structure capable of connecting the towing lines. Moreover, you may use a wire rope or a chain for a tow line.

The trolley 1 of this embodiment is provided with guide troughs 8 and 9 in the longitudinal direction near the upper end of the vehicle body. The guide troughs 8 and 9 connect the sheath pipe 3 to the sewer pipe 2 respectively. It plays a role of guiding and holding the sheath tube to the mounting position when it is mounted on the upper part of the inner wall.

A plurality of annular sheath pipe fixtures 10 are attached to the carriage 1.
Is mounted in a retracted state with its outer diameter contracted, and the carriage 1 is moved to the position where the sheath tube fixing device 10 is mounted,
One of the sheath tube fixtures 10 mounted on the
Is pushed up by the sheath tube fixing device mounting device 11 incorporated in the device to pass through the gap 12 between the guide troughs 8 and 9,
By expanding the outer diameter of the sheath pipe 3 while pressing it against the sheath pipe 3, the outer peripheral surface of the sheath pipe fixture 1 is crimped and fixed to the pipe wall of the sewer pipe 2, and the sheath pipe 3 is inserted through the sheath pipe fixture 1. It is adapted to be fixed to the upper part of the inner wall of the sewer pipe 2.

FIG. 2 shows that the sheath tube 3 is fixed by the sheath tube fixing device 10.
Shows the state of being fixed to the upper part of the inner wall of the sewer pipe 2.
In this embodiment, the sheath tube 3 is made of vinyl chloride resin and has a substantially rectangular cross-section, and the inside is divided into a plurality of sections, and each section has an optical fiber cable for a trunk line connecting communication base stations. 13 and an optical fiber cable 14 for a branch line that is branched from this trunk line cable 13 to each home
Are individually inserted and held. The branch line optical fiber cable 14 is connected to the trunk line fiber cable 13 by a connection box installed in a manhole at the end of the sewer pipe 2.

The sheath tube fixing device 10 includes a support plate 10A that abuts and holds the lower surface of the sheath tube 3 and a pair of holding pieces 10B and 10C that sandwich both side surfaces of the sheath tube 3, and one of the holding pieces. An engagement is formed by a band-shaped elastic body 10D that is joined to a portion that is bent outward from the upper end of 10B and that curves along the inner circumference of the sewer pipe 2, and that is formed at the other end of the band-shaped elastic body 10D. By engaging the portion 10E with the engaging portion 10F provided on the support plate 10A by the sheath tube fixing device mounting device 11 provided on the dolly 1 described above, a structure closed in an annular shape as shown in FIG. Therefore, the outer peripheral surface of the band-shaped elastic body 10 is firmly pressed and fixed to the inner wall surface of the sewer pipe 2 by its elasticity.

Next, FIG. 3 is a longitudinal sectional view showing a main part of the traveling position correcting mechanism of the present invention incorporated in the carriage 1, and FIG.
3 is a cross-sectional view taken along the line AA of FIG. 3, and the traveling position correcting mechanism 15 shown in these drawings is built in a portion indicated by a near the left end of the cart 1 shown in FIG. In addition, another set having the same structure is also incorporated in a portion indicated by b near the right end portion in FIG.

Machine frames 16 and 17 of the traveling position correcting mechanism 15
Is a part of the vehicle body of the bogie 1, and a gearbox 18 is fixed to the machine frame 16 on the vehicle body end side at the center in the vehicle width direction.

At the bottom of the gear box 18, a support shaft 19 with its axis oriented in the vertical direction penetrates, and the support shaft 1
An intermediate portion of the wheel supporting arm 20 is integrally welded and fixed to a lower portion of the vehicle body 9, and both side portions thereof are each bent downward at an angle of approximately 45 degrees toward the outside in the vehicle width direction.

Wheels 4 are rotatably attached to the front and rear ends of the wheel support arm 20 by bolts 21. A bearing is built in the wheel 4, and the inner ring of this bearing is fixed to the wheel support arm 20 by a bolt 21.
The traveling wheels 4 are not shown in FIG.

A bevel gear 22 is stopped from rotating with respect to the support shaft 19 by a key 23 at a position above the middle portion of the wheel support arm 20, and a washer 25 fixed to the upper end of the support shaft 19 by a countersunk screw 24. It is fixed to the support shaft 19 by preventing it from coming off upward.

The outer peripheral surface of the boss portion 22A of the bevel gear 22 has a bearing bush 26 attached to the bottom portion of the gear box 18.
It is rotatably supported by. Further, the vehicle body weight of the bogie 1 is supported by the lower end surface of the bearing bush 26 abutting against the upper surface of the intermediate portion of the wheel support arm 20 to which the traveling wheel 4 is attached, and the bevel gear 22 itself has the vehicle body weight of the vehicle body weight. The structure is such that thrust load does not act.

Above the support shaft 19, a gear box 18 is provided.
The traction shaft 27 is inserted so that it penetrates in the longitudinal direction of the bogie 1
Is provided. The tow shaft 27 has a length that penetrates the entire length of the vehicle body of the bogie 1, and the connecting portions 5 using the above-mentioned eye bolts are screwed to both ends thereof.

A pair of front and rear bevel gears 28, 29 are coaxially arranged in the gear box 18 so as to face each other, and the outer periphery of each boss portion 28A, 29A is the gear box 1.
The bearing bushes 30 and 31 fixed to the front and rear walls of the shaft 8 are rotatably fitted and held.

The bevel gears 28 and 29 mesh with the bevel gear 22 at positions opposite to each other with respect to the support shaft 19, and the shaft holes 28 formed in the bevel gears 28 and 29, respectively.
The traction shaft 27 penetrates B and 29B.

On the inner surfaces of these shaft holes 28B and 29B, there are formed grooves 28C axially penetrating at two diametrically opposed positions.
29C are formed in pairs, and the traction shaft 27
Ridges 27A formed at two corresponding locations on the outer peripheral surface of the
When these are engaged with each other, the bevel gears 28 and 29 are configured to be prevented from rotating with respect to the traction shaft 27.

FIG. 5 is a partial side view of the traction shaft 27, and FIGS. 6 and 7 are transverse cross-sectional views as seen in the direction of arrows at the positions BB and CC in FIG. 5, respectively. As shown in the figure, two pin holes 27B penetrate in parallel in a diametrical direction in which two ridges 27A are arranged on the traction shaft 27 and the diametrical direction is different by 90 degrees from one diametrical direction. The spring pin 2 into these pin holes 27B.
7C is press-fitted and fixed.

These spring pins 27C are formed to be longer than the diameter of the pulling shaft 27, and both ends thereof are drawn.
As shown in FIG. 3, the spring pin 2 is protruded from the two sides of the spring pin 27C at the center interval between the two spring pins 27C.
The bevel gears 28, 2 have a distance equal to the diameter of one 7C.
It is set to be smaller than the interval between the facing end faces of No. 9.

Therefore, the traction shaft 27 is free to axially move with respect to the bevel gears 28 and 29 within a range in which the opposite end surfaces of the two bevel gears 28 and 29 come into contact with one of the spring pins 27C. It can be displaced to.

Further, as shown in FIG. 3, when one spring pin 27C of the traction shaft 27 is in contact with the end face of the bevel gear 28, the protrusion 27A is engaged with the groove 28C of the bevel gear 28, The bevel gear 29 on the opposite side is disengaged from the groove 29C.

When the other spring pin 27C of the traction shaft 27 is displaced to the right in FIG. 3 until it comes into contact with the end face of the bevel gear 29, the protrusion 27A is disengaged from the groove 28C of the bevel gear 28, The groove 29C of the bevel gear 29 enters the groove 29C and engages with it.

In this embodiment, the protrusion 27
The length A is longer than the distance between the facing end faces of the bevel gear 28 and the bevel gear 29, and the length of the protrusion A of the traction shaft 27 is 27A.
Does not come out of both grooves 28C and 29C of these bevel gears 28 and 29 at the same time.

Further, as shown in FIG. 3, the machine casings 17, 18 are
Bearings 34 are attached to the respective shafts concentrically with the traction shaft 27, and these bearings 34 rotatably support a sleeve 35, respectively.

The traction shafts 27 penetrate the insides of the sleeves 35 concentrically, and are formed on the outer peripheral surface of the traction shafts 27 at two locations opposed to each other in the diametrical direction of the inner peripheral surface of each sleeve 35. Grooves 35A that engage with the pair of protrusions 27D are provided, and the traction shaft 27 is slidable in the axial direction in a state in which relative rotation with respect to these sleeves 35 is restricted. A key that engages with the groove 35A may be arranged on the traction shaft 27 instead of the ridge 27D, and the inner peripheral surface of the sleeve 35 may be formed as a spline hole to replace the ridge 27D. A spline that engages with the spline hole may be formed on the outer peripheral surface of the shaft 27.

A weight 36 is arranged between the machine frames 17 and 18, and the pair of sleeves 35 are inserted from both sides into a sleeve mounting hole 36A formed in an upper portion of the weight 36. It is fixed by a key or the like and is swingably supported together with these sleeves 35 around the axis of the traction shaft 27.

FIG. 8 is a transverse sectional view taken along the line D--D in FIG. 3 as seen in the direction of the arrow. As shown in FIG. 8, the weight 36 is formed in a downward fan-shaped transverse sectional shape. In a state where no external force acts on the weight 36, the center of gravity G of the weight 36 is located immediately below the traction shaft 27.

As shown in FIG. 3, the guide trough 8
Bolts to the machine frames 16 and 17 via the mounting plates 37 and 38.
It is fastened with 9, 40, but these bolts 39, 4
Bolt insertion holes 16A of machine frames 16 and 17 through which 0 is inserted,
17A is formed in an arc shape centering on the traction shaft 27, and the angle of the guide trough 8 with respect to the machine frames 16 and 17 can be adjusted about the axis of the traction shaft 27 in the range of about 10 ° on the left and right sides. ing.

Although not shown, the guide trough 8
In the traveling position correcting mechanism incorporated on the side of the guide trough 9 which is opposed to each other via the clearance 12, the positional relationship between the gear box 18 and the weight 36 in the traveling position correcting mechanism 15 shown in FIG. The guide trough 9 has the same structure except that the guide trough 9 is held similarly to the guide trough 8.

Next, the operation of the traveling position correcting mechanism of the present invention will be described. FIG. 9 (A) schematically shows a state in which the truck 1 is traveling in the sewer pipe 2 on the left side in the figure by being pulled by the towing strut 6, and in this case, the towing shaft 27 is the truck. The bevel gear 28, which is displaced to the left in the figure by the traction force received from the traction member 6 with respect to the vehicle body of No. 1, and is displayed in black in the figure on the front side in the traveling direction, rotates integrally with the traction shaft 27. While the opposing bevel gear 29 is free to the traction shaft 27.

At this time, the center of gravity of the weight 36 is shown in FIG.
As shown in, on the vertical axis N at the center of the bogie 1,
The front and rear traveling wheels 4 are oriented parallel to the longitudinal direction of the carriage 1.

Next, FIG. 9 (B) schematically shows a state in which the vehicle 1 travels in the sewer pipe 2 with the traveling wheels 4 biased to the right in the traveling direction, and the vehicle body leans to the left. When the vehicle body starts to tilt in this way, the center of gravity G of the weight 36 moves to the left relative to the center line N of the vehicle body as shown in FIG. When viewed from the rear of the vehicle body from the rear side, the bevel gear 28 and the bevel gear 28 rotate together in a clockwise direction.

Then, the bevel gear 22 rotates counterclockwise as viewed from above as shown in FIG. 9 (B). Bevel gear 22
Is integrally connected to the wheel support arm 20 to which the traveling wheel 4 is attached via the support shaft 19 as shown in FIGS. 3 and 4, so that the traveling wheels 4 at the front and rear of the vehicle body are synchronized to the left. Since the direction is changed, the body of the bogie 1 translates leftward in the traveling direction so as to return the inclination.

Further, FIG. 9 (C) schematically shows a state in which the carriage 1 is in the sewer pipe 2 and the traveling wheels 4 are biased to the left side and the vehicle body is inclined to the right side. When it starts to tilt to, the center of gravity G of the weight 36 moves to the right of the center line of the vehicle body, and as a result, the traction shaft 27 rotates integrally with the bevel gear 28 in the counterclockwise direction, and the traveling wheels 4 in front of and behind the vehicle body move. Turning to the right, the body of the trolley 1 translates to the right of the forward walking so as to return the inclination.

Next, FIG. 11 (A) schematically shows a state in which the trolley 1 travels in the sewer pipe 2 to the right in the figure by being pulled by the tow bar 7, and in this case, The traction shaft 27 is displaced to the right in the figure by the traction force acting from the traction body 7 with respect to the vehicle body of the trolley 1, and the bevel gear 29, which is shown in black in the figure on the front side in the traveling direction, is the traction shaft 27. And a bevel gear 28 facing each other.
Are free with respect to the traction shaft 27. And 3
The center of gravity of 6 is on the center line of the vehicle body, and the front and rear traveling wheels 4 are oriented parallel to the longitudinal direction of the carriage 1.

Further, FIG. 1B schematically shows a state in which the vehicle 1 is in the sewer pipe 2 and the traveling wheels 4 are biased to the left side in the traveling direction and the vehicle body is tilted to the right side. When the vehicle starts tilting in this manner, the center of gravity G of the weight 36 moves to the right relative to the center line of the vehicle body, and as a result, the traveling wheels 4 in front of and behind the vehicle body turn to the right, so that the vehicle body of the bogie 1 changes its inclination. It moves translationally to the right in the direction of travel to return.

Further, FIG. 2C schematically shows a state in which the carriage 1 is in the sewer pipe 2, the traveling wheels 4 are biased to the right in the traveling direction, and the vehicle body is tilted to the left side. When the vehicle begins to lean, the center of gravity G of the weight 36 moves to the left relative to the center line of the vehicle body, and as a result, the traveling wheels 4 in front of and behind the vehicle body turn to the left. Move in translation to the left in the direction of travel.

In the above-described embodiment, the bevel gears 28, 2 are used as coupling / separating means for selectively engaging / disengaging the bevel gears 28, 29 and the traction shaft 27.
Groove 28C formed in the inner peripheral surface of the shaft holes 28B, 29B of 9
The protrusion 27A formed on the outer peripheral surface of the traction shaft 27 is inserted into and removed from the traction shaft 27 in 29C by axially displacing the traction shaft 27. However, an independent key is used for the traction shaft 27 instead of the protrusion 27A. Good.

Further, as the coupling / separating means, the shaft hole 28B,
29B is a spline hole, and a part of the traction shaft 27 is a spline shaft that engages with these spline holes.
The traction shaft 27 may be selectively engaged with one of the bevel gears 28 and 29.

Further, as the coupling / separating means, it is possible to use a clutch such as a meshing clutch which can be selectively coupled / separated between the two bevel gears 28, 29 by axial displacement of the traction shaft 27.

The connecting structure between the traction shaft 27 and the sleeve 35 may be a connecting structure using a key or a spline instead of that of the present embodiment, and the frictional resistance when the traction shaft 27 is axially displaced. When is small, the weight 36 may be directly fixed to the traction shaft 27. Further, although two weights 36 are used in the present embodiment, only one weight 36 may be used depending on the arrangement of the work devices mounted on the carriage 1.

Further, in the above-described embodiment, the traveling position correcting mechanism incorporated in the trolley used for the work for fixing the sheath pipe for inserting and holding the optical fiber cable on the upper part of the inner wall of the sewer pipe has been described. The invention is not limited to the present embodiment, but can be applied to any truck for in-pipe work that is moved by being pulled by a pulling member in a sewer pipe or other pipes.

[0054]

As described above, the traveling position correcting mechanism for the in-pipe work carriage according to the present invention enables the in-pipe work carriage to be pulled forward or backward in any pipe such as a sewer pipe. The deviation of the traveling position can be automatically corrected so as to restore the inclination of.

Further, at a position where the traction shaft reaches the both side limit positions of the axial displacement, both the second bevel gear and the third bevel gear are connected to the traction shaft so that the rotation is restricted. In this case, since these bevel gears cannot rotate freely with respect to the traction shaft at the same time, the rotation angle of the pair of front and rear wheel support arms around the support shaft and the tilt angle of the weight with respect to the vehicle body are The synchronization relationship of can be always maintained.

[Brief description of drawings]

FIG. 1 is a side view of an in-pipe work carriage in which a traveling position correction mechanism of the present invention is incorporated.

FIG. 2 is a perspective view showing a state in which a sheath pipe is fixed in a sewer pipe by using a sheath pipe fixture.

FIG. 3 is a partial cross-sectional view showing a main part of a traveling position correction mechanism of the present invention.

FIG. 4 is a transverse cross-sectional view taken along the line AA of FIG. 3 as seen in the direction of the arrow.

FIG. 5 is a partial side view of the traction shaft.

6 is a cross-sectional view taken along the line BB of FIG. 5 as seen in the direction of the arrow.

7 is a cross-sectional view taken along the line CC of FIG. 5 as seen in the direction of the arrow.

FIG. 8 is a cross-sectional view taken along the line DD of FIG. 3 as seen in the direction of the arrow.

FIG. 9 is a schematic operation explanatory view of the traveling position correction mechanism of the present invention.

FIG. 10 is a diagram schematically showing the positional relationship between the traveling posture of the carriage and the weight.

FIG. 11 is a schematic operation explanatory view of the traveling position correction mechanism of the present invention.

[Explanation of symbols]

1 trolley for in-pipe work, 2 sewer pipe, 3 sheath pipe, 4 running wheels, 5 connecting parts, 6, 7 traction line body, 8, 9 guide trough, 10 sheath pipe fixing tool, 10A support plate, 10B, 10C holding piece 10D band-shaped elastic body, 10E, 10F engaging portion, 11 sheath tube fixing device mounting device, 12 gap, 1
3 optical fiber cables for trunk lines, 14 optical fiber cables for branch lines, 15 traveling position correction mechanism, 1
6, 17 Machine frame, 16A, 17A bolt insertion hole,
18 gear box, 19 support shaft, 20
Wheel support arm, 21 bolt, 22 bevel gear, 2
2A Boss part, 23 key, 24 flat head screw, 2
5 washer, 26 bearing bush, 27 traction shaft, 27A ridge, 27B pin hole, 27C
Spring pin, 27D ridge, 28, 29
Bevel gear, 28A, 29A Boss part, 28B, 29B
Axial hole, 28C, 28C groove, 30, 31 bearing bush, 32, 33 groove, 34 bearing, 35
Sleeve, 36 weight, 36A Sleeve mounting hole, 37, 38 Mounting plate, 39, 40 bolt.

Front page continuation (72) Inventor Akio Kaneko 55-10 Izumida, Okayama City, Okayama Prefecture Mole Industry Co., Ltd. (72) Inventor Takenori Tomomi 1-1 Ogasemote-cho, Okayama City, Okayama Prefecture JA Okayama Building Sewerage Bureau, Okayama City ( 56) References Japanese Unexamined Patent Publication No. 10-152045 (JP, A) Actually developed 55-99959 (JP, U) Actually developed 4-26164 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B61B 13/10 B62D 57/02 F16H 1/14 B08B 9/04

Claims (4)

(57) [Claims] 1. A pair of support shafts, each of which is rotatably supported around a longitudinal axis in the center of the vehicle body in the width direction and in the vicinity of both ends in the longitudinal direction, and traveling wheels are rotatably attached to both ends, and an intermediate portion is provided. , A pair of wheel support arms fixed to their respective support shafts, capable of axial displacement within a predetermined range and rotational displacement around the axis,
A traction shaft that is supported by the vehicle body above the support shafts so that the axis is oriented in the longitudinal direction of the vehicle body and is orthogonal to the axes of the respective support shafts, and that has a connecting portion at both ends for connecting to the traction body. A weight having a center of gravity below the traction shaft, which is provided so as to rotate integrally with the traction shaft around the axis of the traction shaft, and a pair of a pair that transmits rotational displacement of the traction shaft with respect to the vehicle body to the respective support shafts. And a first bevel gear fixed to an upper end portion of the support shaft, the pair of transmission means being rotatable with respect to the vehicle body at a fixed position, and having a traction shaft passing through the center portion thereof. A second bevel gear and a third bevel gear, which are coaxially opposed to each other and are in constant mesh with the first bevel gear on both sides in the radial direction, and have the same number of teeth, and the traction shaft is a traction of the traction strip. Depending on which one of the second bevel gear and the third bevel gear When the bevel gear and the traction shaft are displaced in the axial direction, the bevel gear and the traction shaft are coupled so as to rotate together, and the bevel gear and the traction shaft on the opposite side are relatively rotatable. A bogie for in-line work characterized in that the pair of wheel support arms are synchronously rotated in a direction to return the inclination of the vehicle body to the traveling direction by the relative rotation of the weight with respect to the vehicle body caused by the inclination of the vehicle body. Travel position correction mechanism. 2. The coupling / separating means couples both the second bevel gear and the third bevel gear to the traction shaft and restrains the rotation at a position where the traction shaft reaches both side limit positions of the axial displacement. The traveling position correcting mechanism for the in-pipe work carriage according to claim 1, wherein 3. The traveling position correcting mechanism for a work vehicle according to claim 1, wherein a key is used as the coupling / separating means. 4. A traveling position correcting mechanism for a bogie for in-pipe work according to claim 1 or 2, wherein a spline is used as the coupling / separating means.