JPH0211331B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rail bender having a truss structure and rolling members.

[Conventional technology]

FIG. 26 shows an example of a conventional four-point support type rail bender. In the figure, 1 indicates reinforcing ribs 1a and 1b on the horizontal and vertical surfaces, respectively.
A pair of arms with a rail 2 at the tip.
The rail 2 can be fitted from above to support the rail 2 from both sides. Reference numerals 3 and 4 refer to a pair of connecting rods having one end connected to the rear ends of both arms via pins 5 and 5, respectively, and 6 a concentric connection connecting the other ends of these connecting rods 3 and 4 to each other. A jack 7 is an operating handle for substantially expanding and contracting the connecting rods 3 and 4.

The conventional rail bender having the above configuration has a second
By extending the connecting rods 3 and 4 in the direction of arrow A using the jack 6 shown as a skeleton in Fig. 7,
By generating a bending moment in the direction of arrow B in both arms 1, 1, the rail 2 can be bent inward.

FIG. 28 shows a skeleton of another example of a conventional three-point support type rail bender. In this example, fulcrum shafts 9 are provided at both ends of the U-shaped arm 8.
These fulcrum shafts are set on top of the rail 2 in the same manner as the four-point support system described above, and each fulcrum shaft 9, 9 is brought into contact with one side of the rail 2, and the U-shaped arm By pressing the rail 2 in the direction of arrow C from the other side by a pressing force generating device 10 consisting of a cylinder etc. provided at the central abdomen of the U-shaped arm 8, the pressing force generating device 10 of the U-shaped arm 8 extends on both sides. By creating a bending moment in the direction of arrow D in the left and right arm portions 8a and 8b, the rail 2
I try to bend it outward. In this example as well, reinforcing ribs are provided on the horizontal and vertical surfaces of the U-shaped arm 8, respectively, as in the four-point support type described above.

[Problem that the invention seeks to solve]

As mentioned above, the conventional rail bender is attached to the rail 2, so the method of setting it on the rail 2 is simple, but both the 4-point support method and the 3-point support method have a Since large bending stress acts in the horizontal and vertical planes between the arms, reinforcing ribs must be provided on both the horizontal and vertical planes of the arm to withstand this bending stress, which necessitates an increase in size. Not only is it not possible to achieve a reduction in size and weight, but there is also a problem in that transportability and mobility are poor, and the labor of two or more people is required for small movements and bending operations to bend the rail 2.

In view of the above points, the present invention does not require the installation of reinforcing ribs because bending stress does not occur between the points of application, and is therefore lightweight and easy to handle, and moreover, the pressure points on the rail are reduced. The object of the present invention is to obtain a rail bender that has a large capacity for small movements and is capable of measuring bending conditions and has extremely high workability.

[Means for solving problems]

The rail bender according to the present invention includes a pair of upper and lower triangular frames each consisting of upper and lower chord parts on both sides, and an intermediate part that hangs down from the intersection apex of the upper and lower chord parts to the lower chord part; a pair of fulcrum shafts that are removably installed at each connecting portion between the lower chord part and the upper chord parts on both sides of the frame body and that can come into contact with one side of the rail arranged between the two frame bodies; a pressing force generating device that is removably installed at the intersection apex of both upper and lower chord portions, and whose tip pressing member is constrained and guided by the intermediate portion to press and bias the rail from the other side; A pair of rolling members are arranged in parallel in the middle part of the frame body on both sides of the middle part of one of the inner surfaces for guiding relative contact rolling with the rails that come into contact with the pair of fulcrum shafts. The rail is pivoted within the groove-shaped support member, and a scale is provided along the intermediate portion to measure the radius of curvature of the bent rail.

[Effect]

In the present invention, the frames disposed above and below the rail have a truss structure that linearly connects the points of action, and each fulcrum axis is provided so as to form a horizontal structure perpendicular to the plane of the truss. Therefore, when the pressing force generator is in operation, the load acts only on the frame as direct stress, that is, tensile stress or compressive stress. It has become possible to save on materials such as, make it smaller and lighter, and reduce the number of workers. Furthermore, rollers and other rolling members for guiding the contact rolling of the rail are provided on one inner surface of the frame, and a scale for measuring the radius of curvature of the bent portion of the rail is provided in the middle of the frame. Therefore, it is possible to easily perform a rail bending operation with a desired accurate degree of bending while slightly moving the pressing force point of the rail.

〔Example〕

The present invention will be described below with reference to a first embodiment shown in FIGS. 1 to 3. In the figure, reference numeral 11 indicates the lower chord part 1 from the top of the intersection between the upper chord parts 11a and 11b on both sides, the lower chord part 11c, and the upper chord parts 11a and 11b on both sides.
A pair of triangular frames consisting of a middle part 11d hanging down to the middle part 1c, and one frame 1
1 includes an engaging claw 12a as shown in FIGS. 4 to 6.
As shown in FIG. 7, a bearing 12 is provided on the other frame 11, and a bearing 13 is provided on the other frame 11, as shown in FIG.
14 denotes bearings 12 and 13 for both frames 11 and 11.
A pair of fulcrum shafts having both end portions 14a and 14b fitted therein, and one side of the central portion in the longitudinal direction is provided with a shaft that engages with the engagement pawl 12a of the bearing 12, as shown in FIGS. 8 to 10. The matching stepped portion 14c and both frames 1
Step portions 14d, 14e, and 14f that can abut each other are formed on one side of the upper and lower flange portions 2a, 2b and web portion 2c of the rail 2 disposed between the rails 1 and 11, respectively.

Reference numeral 15 designates a trunnion holder in which both end protrusions 15a and 15b are rotatably mounted between bearings 16 provided at the intersection tops of both upper chord parts 11a and 11b of both frames 11 and 11, and the longitudinal direction thereof is The boss portion 15c in the center has the markings shown in FIGS.
As shown in FIG. 3, a hole 15d is bored, and a female thread 15e is formed on the inner peripheral surface of the hole 15d.
17 is the trunnion holder 15 on the outer peripheral surface of the tip.
(14th
(see figure), after being attached to the trunnion holder 15, it is pivoted to both frames 11, 11 so as to be horizontally swingable. 18 is a coupler for communicating and connecting the cylinder 17 and the hydraulic hose 19;
Reference numeral 20 designates the piston rod of the cylinder 17, and a male thread 20a is formed on the outer circumferential surface of the tip thereof, and one end side of a bending shoe 21 having a T-shaped cross section is screwed into this male thread 20a. As shown in FIGS. 15 and 16, the bending shoe 21 includes a bottom portion 21b formed with a female thread 21a that engages with the male thread 20a of the piston rod 20, and a protrusion extending from the bottom portion 21b. A guide plate 22 is brought into contact with the intersecting surface of the upper surface 21d of the protrusion 21c and the end surface 21e of the bottom 21b, and is fixed by screws 23. The guide plate 22 has a concave guide groove 22a carved in its upper edge in the plate thickness direction, and when the cylinder 17 is attached to the frame body 11, this guide groove 22a fits into the intermediate portion 11d of the frame body, and the tip A piston rod 20 screwed onto a bending shoe 21 constituting a pressing member is guided along the intermediate portion 11d.

Reference numeral 24 denotes a pair of supports made of channel steel that are installed between the upper chord parts 11a, 11b and the lower chord part 11c on the lower surface of the frame 11 located below, and are fixed by tightening the mounting piece 24a with screws 25. a member, each having a pair of bearing plates 2 in its grooves.
6 are provided facing each other, and these bearing plates 2
A roller 27 that can come into contact with the lower surface of the rail 2 is rotatably mounted between the rollers 6 and 26. Moreover, 28 is a scale provided in the middle part of the frame body 11 located above, with which the degree of bending of the rail 2, that is, the radius of curvature can be determined.

The rail bender of the present invention configured as described above has a frame body 11 having rollers 27 placed thereon, a rail placed on the rollers 27, and each fulcrum shaft 14, 1
As shown in FIGS. 4 and 17, a trunnion holder 15 to which a cylinder 17 etc. are attached in advance is attached in a drop-down manner, and a frame 11 has a scale 28 thereon.
Assembly is completed just by fitting.

The rail bending operation is performed by supplying pressurized oil from a hydraulic pump (not shown) to the cylinder 17 to extend the piston rod 20, and bending shaft 21.
This is done by bringing the tip of the rail 2 into contact with the web part of the rail 2 as shown by the imaginary line in FIG. . When changing the bending position of the rail 22 after bending, only the rail 2 on the rollers 27 is moved.

FIG. 18 shows a skeleton of the rail bender of the present invention, showing the cylinder 17 during the above operation.
The pressing force acts in the direction of arrow E to bend the rail 2 outward, but at this time, tensile stress is applied to both upper chord parts 11a and 11b of the frame 11 in the direction of arrow F, and tensile stress is applied to the lower chord part 11c. Since compressive stress acts in the G direction, no bending moment occurs as in the conventional case.

FIG. 19 is a view corresponding to FIG. 2 showing a second embodiment of the rail bender of the present invention. In this embodiment, each supporting member 24, 24 equipped with a roller 27 is attached to the frame 11 located above, and the upper and lower frames 11, 11 are connected and fixed by bolts and nuts 29, 30, and the lower The frame body 11 and the fulcrum shaft 1 located at
As mentioned above, the device of the present invention is set movably with respect to the rail 2 by placing both ends of the rail 2 on the wooden stand 31, while preventing the 4 etc. from falling off the frame 11 located above. This is different from the first embodiment. In this embodiment, since it is not necessary to move the heavy rail 2, it is not only easy to move when changing the bending position, but also
This has the advantage that accurate positioning is possible.

20 to 22 are views corresponding to FIGS. 1 to 3 showing a third embodiment of the rail bender of the present invention. In this embodiment, as shown in FIGS. 23 and 24, each fulcrum shaft is provided with a stepped shaft member 32 that can come into contact with the upper and lower flange portions 2a, 2b and one side of the web portion 2c of the rail 2, respectively. This embodiment is different from the first and second embodiments described above in that the stepped shaft members 32, 32 are rotatably mounted between the frames 11, 11. In the case of this embodiment, the diameter of the enlarged diameter portion 32b adjacent to the connection portion 32a to the upper frame 11 in the stepped shaft member 32 is as follows:
Since the diameter of the bearing 33 of the frame body 11 is set to be larger than that of the bearing 33, even if the bearing 12 having the above-mentioned engaging claw 12a is used, the influence thereof can be almost ignored. In the example, a bearing 33 is shown without an engaging pawl. This embodiment has the effect that the rail 2 can be moved more smoothly due to the coupling action between the rotatable step shaft member 32 and the lower roller 27.

FIG. 25 is a 19th embodiment showing a fourth embodiment of the present invention.
It is a figure equivalent figure. This embodiment differs from the above-described second embodiment in that the stepped shaft members 32 are used for each fulcrum shaft. In addition to the effects of the second embodiment, this embodiment has the advantage that it is possible to prevent the device from shifting laterally during movement.

In the second and third embodiments, each bolt 29 inserted through the upper and lower frames 11, 11 is fixed by a nut 30. Similarly to the channel steel 24, each upper chord part 11a, 11b of the frame 11
A narrow beam member may be installed between the lower chord portion 11c and the lower chord portion 11c, and internal threads corresponding to the respective bolts 29 may be cut in these beam members, and the bolts 29 may be fastened thereto. In this case, the beam member can also serve as reinforcement for the frame body 11, making it possible to increase the strength of the frame body 11 and to reduce the number of parts. Further, the channel steel 24 and the beam members may be integrally joined by welding each frame 11 in advance, and each frame may be relocated and set depending on the purpose. In this case, the number of parts will be increased. It is possible to reduce this and improve workability.

Further, in the above embodiment, a cylinder is used as the pressing force generating device, but other means such as a screw jack may be applied to this, and the same effect as described above can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, the frames disposed above and below the rail have a truss structure that linearly connects the points of action, and each fulcrum axis is a horizontal structure perpendicular to the plane of the truss. Since the bending stress is not generated, the parts can be made smaller and lighter, they can be transported in pieces, and small movements to the bending position can be carried out extremely easily.
This has the effect of greatly reducing work effort and reducing the number of workers. Furthermore, according to the present invention, since the fulcrum shaft is supported by a pair of frames disposed above and below the rail, the pressing force of the pressing force generating device can be directly applied to all of the upper and lower flanges and web portions of the rail. You can get a good curved track. In the present invention, the upper and lower frames have a triangular shape with an intermediate part hanging down from the top, and have a strong frame structure that can withstand rail bending. It is configured as a frame body that can be inserted and removed, so that it can be easily accommodated on a long rail, and the intermediate portion is used as a guide for pushing the tip pressing member to prevent deflection of the pressing force against the rail. Furthermore, the rolling members on both sides of the intermediate portion are provided within the groove-shaped support member to ensure smooth relative rolling relative to the rail without being hindered from the outside, and the scale of the intermediate portion allows for accurate rolling of the rail. It can be expected to have unique effects as a rail bender, such as being able to ensure a certain degree of bending.

[Brief explanation of drawings]

Figures 1 to 3 all show a first embodiment of the rail bender according to the present invention, where Figure 1 is a plan view, Figure 2 is a front view, and Figure 3 is a partially exploded view. 4 is a plan view showing the fulcrum shaft support portion of the frame located above, FIG. 5 is a cross-sectional view taken along the line ``-'' in FIG. 4, and FIG.
7 is a sectional view showing the fulcrum shaft support part of the frame located below, FIG. 8 is a plan view showing the fulcrum shaft in contact with the rail, and FIG. 9 is a sectional view showing the fulcrum shaft support part of the frame located below. Side view, Figure 10 is a front view of the fulcrum shaft, Figure 11
The figure is a plan view showing the trunnion holder, Fig. 12 is a side view thereof, Fig. 13 is a front view thereof, Fig. 14 is a side view showing the cylinder, and Fig. 15 is a state in which the guide plate is attached to the bending shoe. Fig. 16 is a plan view thereof, Fig. 17 is a perspective view showing the cylinder attached to the trunnion holder, Fig. 18 is an operation explanatory diagram showing the rail bender of the present invention in skeleton form, Fig. 19 20 to 22 are views corresponding to FIG. 2 showing the second embodiment of the present invention.
The figures all show the third embodiment of the present invention; Fig. 20 is a view equivalent to Fig. 1, Fig. 21 is a view equivalent to Fig. 2, Fig. 22 is a view equivalent to Fig. 3, and Fig. 23 is a view equivalent to Fig. 2. 24 is a side view thereof, FIG. 25 is a view corresponding to FIG. 21 showing the embodiment of FIG. 4 of the present invention, and FIG. Perspective view showing an example of a conventional rail bender, 2nd
FIG. 7 is an operational explanatory diagram showing the one in FIG. 26 as a skeleton, and FIG. 28 is an operational explanatory diagram showing another example of the conventional rail bender as a skeleton. 2...Rail, 11...Frame body, 11a, 11b...Upper chord section, 11c...Lower chord section, 11d...Intermediate section, 14...
Fulcrum shaft, 17...Cylinder (pressing force generator), 2
7...Roller (rolling member), 28...Scale. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1 A pair of upper and lower triangular frames consisting of both upper and lower chord parts, and an intermediate part that hangs down from the intersection apex of the upper and lower chord parts to the lower chord part, and the lower chord part and both sides of the upper and lower sets of the frame bodies. a pair of fulcrum shafts that are removably installed at each connecting portion with the upper chord portion and capable of abutting against one side of the rail disposed between the two frame bodies; and an intersecting apex of the upper chord portions on both sides of the frame bodies. a pressing force generating device which is removably installed in the upper and lower frames and whose tip pressing member is restrained and guided by the intermediate portion to press and bias the rail from the other side; A pair of rolling members for guiding relative contact rolling with the rails abutting on the pair of fulcrum shafts on both sides of the intermediate portion of one inner surface are pivoted within the groove-shaped support member arranged in parallel in the intermediate portion. The rail bender is characterized in that the middle part is provided with a scale for measuring the radius of curvature of the bent rail.