JP5171928B2 - Rail clamp device - Google Patents

Description

  The present invention relates to a rail clamp device, and more particularly to a rail clamp device that grips a rail with a biasing force of a spring member.

  2. Description of the Related Art Conventionally, a rail clamp device that grips a rail by a biasing force of a spring member is known (see, for example, Patent Document 1).

  In Patent Document 1, a pair of clamp arms for gripping the rail from both sides, a spring member including two coil springs for biasing the pair of clamp arms toward the rail gripping side, and the clamp arm are driven to the rail gripping release side. A rail clamp device having a hydraulic cylinder is disclosed. Each of the pair of clamp arms is provided with a grip portion for gripping the rail at the lower end, and one end of the pair of link members is rotatably connected to the upper end. The two spring members are arranged in a vertically expandable / contractible state between a pair of clamp arms and compressed in the vertical direction, and urge the other end of the link member upward to expand the upper end of the clamp arm, As a result, the gripping force for gripping the rail is transmitted to the gripping portion of the clamp arm. Further, a hydraulic cylinder is provided laterally above the two spring members so as to connect the upper ends of the pair of clamp arms. Then, by retracting the rod of the hydraulic cylinder, the upper ends of the pair of clamp arms (one end of the pair of link members) are brought close to the biasing force of the spring member, and the clamp arms are driven to the rail grip release side. It is configured. As described above, in the rail clamp device according to Patent Document 1, the spring member that can be expanded and contracted in the vertical direction and the hydraulic cylinder that moves the rod back and forth in the horizontal direction (horizontal direction) are arranged side by side in the vertical direction. It is configured.

Japanese Patent Laid-Open No. 2003-238069

  However, in the rail clamp device according to Patent Document 1, since the hydraulic cylinder for releasing the grip of the rail is disposed above the spring member, the stroke of the spring member between the rail grip state and the rail grip release state ( It is necessary to secure the height of the rail clamp device by the height of the spring member including the displacement amount), the link mechanism that transmits the urging force of the spring member to the clamp arm, and the hydraulic cylinder. For this reason, since the height of a rail clamp apparatus becomes large, there exists a problem that a rail clamp apparatus will enlarge.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rail clamp device that can be miniaturized by reducing the height of the device. It is.

Means for Solving the Problems and Effects of the Invention

In order to achieve the above object, a rail clamp device according to one aspect of the present invention includes a pair of levers that can be rotated around a rotation shaft to grip and clamp the rails from both sides, and the pair of levers are rails. A coiled compression spring member that biases the pair of levers so as to rotate in a clamping direction and a pair of levers that are arranged inside the coiled compression spring member and compress the compression spring member Bei example and can clamp release mechanism thereby releasing the clamp by compression spring member and the compression spring member inside arranged clamps release mechanism of overlap in the height direction to the clamp release mechanism compression spring member It is provided so that it may be accommodated inside.

In the rail clamp device according to one aspect of the present invention, as described above, the coil-like compression spring member that biases the pair of levers and the coil-like compression spring member are disposed inside, and the compression spring member is compressed. By providing a clamp release mechanism capable of releasing the clamp by the pair of levers, the clamp release mechanism is arranged so that the height position overlaps (overlaps) with the compression spring member inside the coiled compression spring member. Can be arranged. Thereby, compared with the structure which arrange | positions a clamp release mechanism above a compression spring member, the height of a rail clamp apparatus is made small by the part which a compression spring member and a clamp release mechanism overlap in the height direction (overlap). Thus, the apparatus can be reduced in size. The compression spring member and the clamp release mechanism disposed inside the compression spring member overlap in the height direction, and the clamp release mechanism is provided so as to be accommodated inside the compression spring member. If comprised in this way, size reduction of an apparatus can be achieved easily by the part which a compression spring member and a clamp release mechanism overlap in a height direction.

  The rail clamp device according to the above aspect preferably further includes an upper member and a lower member that are in contact with an upper end portion and a lower end portion of the compression spring member, respectively, and the clamp release mechanism uses the upper member as an urging force of the compression spring member. By moving it against the lower member, the compression spring member is compressed and the clamp by the pair of levers is released. With this configuration, the clamp can be released simply by moving the upper member to the lower member against the biasing force of the compression spring member, so a link mechanism or the like can be used to release the clamp by the lever. There is no need to provide it. As a result, it is possible to simplify the device configuration as compared with the configuration in which the link mechanism is provided, and it is possible to reduce the size of the device by the amount that the link mechanism is not provided.

  In the rail clamp device according to the above aspect, preferably, an upper portion of the pair of levers is provided with an inclined surface that is inclined with respect to the extension direction of the compression spring member, and is provided at a position below the inclined surface. The apparatus further includes a contact member that moves along with expansion and contraction of the spring member and abuts against the inclined surfaces of the pair of levers, and pushes the inclined surface by extension of the compression spring member while the abutting member contacts the inclined surface of the lever. Thus, the pair of levers are configured to grip and clamp the rail by moving upward and rotating the pair of levers. If comprised in this way, the urging | biasing force of the expansion | extension direction of a compression spring member can be transmitted to a pair of lever directly via a contact member and an inclined surface. As a result, compared with the configuration in which the urging force of the spring member is transmitted by the link mechanism, the apparatus can be reduced in size by the amount that the link mechanism is not provided between the compression spring member (contact member) and the lever (inclined surface). Can be planned. For example, when the compression spring member moves the contact member downward from above the pair of levers, it is necessary to provide a support member for supporting the compression spring from above, while the contact member is a compression spring member. Since the support member is not required to be provided above the pair of levers by moving the pair of levers upward by the extension of the device, the height of the device can be reduced and the device can be made compact. Can be

  In this case, preferably, each of the pair of levers is replaceably attached, and further includes a wedge-shaped member having an inclined surface, and the abutting member contacts the inclined surface of the wedge-shaped member attached to the pair of levers. The roller member is configured to be in contact with and rotatable while being in contact with the inclined surface. If comprised in this way, while the wedge-shaped member which has an inclined surface where the urging | biasing force of a compression spring member acts can be replaced | exchanged easily, a roller member rotates by contacting with an inclined surface, and a roller member Friction due to contact with the inclined surface (wedge-like member) can be suppressed, and wear of the roller member and the wedge-like member can be reduced.

  In the rail clamp device according to the above aspect, preferably, the rail clamp device further includes a fixed block that supports the pair of levers so as to be rotatable, and supports the compression spring member and the clamp release mechanism. And a guide portion that abuts on the rail and restricts the movement of the fixed block when the fixed block moves in a lateral direction perpendicular to the rail in the clamp-released state. With this configuration, even when the fixed block moves in the horizontal direction due to the curvature of the rail or the lateral load from the outside, the rail clamp device comes off the rail by the guide portion coming into contact with the rail. Or tilting more than a certain amount can be restricted.

  In this case, preferably, each of the pair of levers has a rotation restricting portion that abuts the fixed block and restricts the rotation of the lever, and the rotation restricting portion is configured so that the fixed block is attached to the rail in the clamp released state. In contrast, the lever is provided so as to limit the rotation of the lever at a predetermined lever rotation position where the lever is not in contact with the rail in a state where the guide portion is in contact with the rail while being inclined in the lateral direction. If comprised in this way, even if it will incline until a guide part contact | abuts to a rail in a clamp release state, it can prevent that a lever contact | abuts to a rail by a rotation limitation part. Thereby, it is possible to prevent the lever from coming into contact with the rail in the clamp released state and the rail gripping portion of the lever from being worn (consumed).

  In the configuration including the fixed block, preferably, the vehicle further includes one wheel that is rotatably supported by the fixed block and that moves on the rail along the rail, and the one wheel is disposed at a position between the pair of levers. Has been. If comprised in this way, while supporting a pair of lever so that rotation is possible, a rail clamp apparatus can be moved only by providing a wheel in the fixed block which supports a compression spring member and a clamp release mechanism. it can. Further, unlike the case where a plurality of wheels are provided outside the rail clamp device, only one wheel needs to be provided on the fixed block, so that the structure of the moving mechanism including the wheels can be simplified and the entire device can be downsized. Can be achieved. In this case as well, the guide portion of the fixed block can prevent the wheel from being removed from the rail, so that it is not necessary to provide a wheel for preventing the wheel from being removed.

  In the rail clamp device according to the above aspect, preferably, the pair of levers are rotatably supported, a fixed block that supports the compression spring member and the clamp release mechanism, and a moving structure that moves along the rail. And a bracket that accommodates the fixed block inside, the fixed block has a fixed block side limiting member, and the bracket has a bracket side limiting member that contacts the fixed block side limiting member, and is fixed When the block is inclined in the lateral direction with respect to the bracket, the fixed block side limiting member and the bracket side limiting member are brought into contact with each other, whereby the horizontal inclination of the fixed block with respect to the bracket is limited. If comprised in this way, in the structure which moves each part supported by a fixed block and a fixed block with a moving structure via the bracket attached to moving structures, such as a cargo handling machine (a crane etc.) and an open / close roof, it is fixed. By the contact between the block side limiting member and the bracket side limiting member, the relative inclination between the bracket and the fixed block can be easily limited.

  In the configuration in which the inclined surface is provided, the inclined surface preferably has a pressing force against the rail of the lever when gripping the rail in the initial state, and a pressing force against the rail of the lever when gripping the rail in a predetermined wear state. So that the inclination angle at the contact position with the contact member when gripping the rail in the initial state is different from the inclination angle at the contact position with the contact member when gripping the rail in the predetermined wear state. It is configured. Here, in the state where the rail is worn compared to the initial state where the rail is not worn, it is necessary to rotate the lever extra by the amount of wear of the rail when clamping by the lever. In this case, it is necessary to extend the compression spring member from the initial state, and the contact position between the abutting member and the inclined surface also changes, so that the pressing force (clamping force) on the rail becomes smaller depending on the rail wear state. Will change. On the other hand, by making the inclination angle of the inclined surface at the contact position with the contact member in the initial state different from the contact angle of the inclined surface at the contact position with the contact member in the predetermined wear state as described above. Since the pressing force on the rail in the initial state can be lowered so as to approach the pressing force in the predetermined wear state, the pressing force on the rail in the initial state is suppressed from becoming too high (too large). be able to.

  In this case, the inclined surface preferably has a first inclined surface that comes into contact with the contact member when gripping the rail in the initial state and a first contact surface that comes into contact with the contact member when gripping the rail in the predetermined wear state. The first inclined angle of the first inclined surface is larger than the second inclined angle of the second inclined surface. Here, in the predetermined wear state, it is necessary to extend the compression spring member by the amount of wear compared to the initial state without wear, so the pressing force (clamping force) on the rail is reduced. Therefore, if a required pressing force (clamping force) is obtained even in a predetermined wear state, an excessive pressing force (clamping force) is usually generated in the initial state. For this reason, in the configuration in which the lever is rotated so as to push and spread the inclined surface, the first inclined angle of the first inclined surface that contacts in the initial state as described above is the second of the second inclined surface that contacts in the worn state. By making it larger than the inclination angle, the clamping direction (direction in which the lever is rotated toward the rail) component of the biasing force of the compression spring member can be made relatively small in the initial state. Thereby, even when it is configured to obtain a required pressing force (clamping force) in a predetermined wear state, it is possible to suppress the occurrence of excessive pressing force (clamping force) in the initial state. It is possible to suppress wear (abrasion) of the contact portion between the contact member and the first inclined surface and the contact portion between the lever and the rail.

  In the rail clamp device according to the above aspect, preferably, the rail clamp device further includes an upper member and a lower member that respectively contact an upper end portion and a lower end portion of the compression spring member, and the clamp release mechanism includes a cylinder installed on the lower member; And a rod that can be moved back and forth in the vertical direction from the cylinder, and has an upper end connected to the upper member. The upper member and the rod each have a first contact surface that is a spherical convex surface, and a first contact. They are connected via a connecting member having a second abutting surface made of a spherical concave surface that is in spherical contact with the surface so as to be movable. With this configuration, even when the upper member is inclined with respect to the rod, the first contact surface and the second contact surface that are in spherical contact move according to the inclination of the upper member, so that the upper member is inclined. Due to this, it is possible to suppress the load from being applied to the rod. Accordingly, in the configuration in which the clamp release mechanism is disposed inside the compression spring member, the urging force of the compression spring member with respect to the upper member varies in the horizontal direction (for example, the urging force varies in the front and rear directions), so the upper member is slightly Even in the case of tilting, it is possible to reduce the lateral (bending direction) load applied to the rod due to the tilt of the connecting portion (upper member).

It is a perspective view showing the whole rail clamp device composition by one embodiment of the present invention. It is sectional drawing which looked at the rail clamp apparatus by one Embodiment shown in FIG. 1 from the side surface side. It is a front view of the internal unit of the rail clamp apparatus by one Embodiment shown in FIG. It is sectional drawing seen from the back side for demonstrating the clamped state of the internal unit shown in FIG. It is sectional drawing seen from the back side for demonstrating the clamp release state of the internal unit shown in FIG. It is a top view of the bracket of the rail clamp apparatus by one Embodiment shown in FIG. It is the perspective view which showed the wedge of the internal unit shown in FIG. FIG. 8 is a side view of a wedge schematically showing the shape of the wedge shown in FIG. 7. It is a perspective view of the fixed block of the rail clamp apparatus by one Embodiment shown in FIG. It is a schematic diagram for demonstrating the state in which the internal unit inclined in the horizontal direction in the clamp release state shown in FIG. It is a schematic diagram for demonstrating the block side limiting member and bracket side limiting member of the rail clamp apparatus by one Embodiment shown in FIG. It is a schematic diagram which shows the state which the internal unit inclined in FIG. It is a schematic diagram which shows the state which the internal unit inclined further in FIG. It is a schematic diagram for demonstrating the change by the abrasion state of the rail of the position of each part of the rail clamp apparatus by one Embodiment shown in FIG. It is a schematic diagram for demonstrating the change of the clamping force by the inclination angle of an inclined surface. It is the graph which showed the change of the pressing force by the rail abrasion amount of the rail clamp apparatus (Example) and comparative example by one Embodiment shown in FIG. It is a side view which shows the modification of the rail clamp apparatus by one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the structure of a rail clamp device 100 according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the rail clamp apparatus 100 according to the present embodiment runs away (moves in the traveling direction) when a moving structure such as a cargo handling machine that moves along the rail receives a strong wind or the like while it is stopped. This is a device (escape prevention device) for preventing this. Examples of the cargo handling machine include a container crane that is used in a harbor or the like for loading and unloading containers. In addition to the cargo handling machine, the moving structure includes a dome-type open / close roof that moves along rails. The large moving structure has a traveling device and is configured to be movable along the rail. The rail clamp device 100 is connected to a moving structure such as the above-described cargo handling machine or an open / close roof, and grips (clamps) the rail to prevent the moving structure from moving away when stopped, and moves by releasing the grip. Sometimes it is configured to move with the moving structure.

  As shown in FIG. 1 to FIG. 3, the rail clamp device 100 is connected to an internal unit 1 composed of a clamp mechanism that grips the rail, and a moving structure such as a cargo handling machine, and a bracket that accommodates the internal unit 1 inside. 2 and a hydraulic unit 3 for driving the internal unit 1. Further, the rail clamp device 100 includes a cover 4 that is attached to the bracket 2 and covers the internal unit 1.

  As shown in FIGS. 4 and 5, the internal unit 1 holds the rail 110 by the pair of levers 10 and clamps the rail 110 so as not to move, and holds the rails 110 by the pair of levers 10. It is configured to be switchable to a clamp release state (see FIG. 5) in which the movement is released.

  As shown in FIGS. 1 and 6, the bracket 2 has a rectangular frame shape when viewed from above (in the direction of arrow Z1), and the top and bottom are open. Further, the bracket 2 is formed so as to surround and accommodate the lower side (arrow Z2 direction side) portion of the internal unit 1 including the fixing block 40 described later. The bracket 2 and the internal unit 1 are not connected and fixed, and the internal unit 1 is movable inside the bracket 2. As described above, when the moving structure (loading machine or the like) moves along the rail 110, the bracket 2 connected to the moving structure (loading machine or the like) pulls (or pushes) the internal unit 1 to move. It is configured.

  As shown in FIGS. 1 and 2, the hydraulic unit 3 is installed on a mounting base 3 a fixed to the rear portion (arrow Y <b> 2 direction side) of the bracket 2. The hydraulic unit 3 is connected to a later-described hydraulic cylinder 30 of the internal unit 1 via a hydraulic tube (not shown). The hydraulic unit 3 has a function of switching from the clamped state to the clamp-released state by supplying hydraulic pressure (working fluid) to the hydraulic cylinder 30. The rail clamp device 100 is configured to be in a clamped state when the hydraulic unit 3 is not operated, and is a so-called fail-safe structure that acts on the clamp side (runaway prevention side) even when the hydraulic unit 3 is not operating. It has become. The hydraulic cylinder 30 is an example of the “clamp release mechanism” in the present invention.

  Next, the configuration of the internal unit 1 will be described in detail. As shown in FIG. 3, the internal unit 1 includes a pair of levers 10, a coiled compression spring member 20, and a hydraulic cylinder 30 (see FIG. 4). The pair of levers 10, the compression spring member 20, and the hydraulic cylinder 30 are supported by a fixed block 40. In addition, the fixed block 40 is provided with one wheel 50, and the wheel 50 is configured to be rotatable on the upper surface of the rail 110. Thereby, the internal unit 1 is configured to be movable on the rail 110 by the wheels 50.

  The pair of levers 10 of the internal unit 1 are arranged to face each other so as to sandwich both sides of the rail 110. The pair of levers 10 are formed so as to extend in the vertical direction (Z direction), respectively, and have a shape in which the lower side is curved toward the inner side (rail 110 side) when viewed from the front. The pair of levers 10 are provided symmetrically when viewed from the front and have the same configuration.

  The lever 10 is provided with a shoe (gripping part) 11 for gripping the rail 110 at the lower end part and a wedge 12 having an inclined surface 12a at the upper end part. As shown in FIG. 4, the lever 10 is rotatably supported by the fixed block 40 via the rotation shaft 41 at a position below the lever 10 and above the shoe 11. As a result, the pair of levers 10 rotate in the direction of the arrow R1 about the rotation shaft 41, and the shoe 11 is clamped by clamping the upper side surface of the rail 110 from both sides (see FIG. 4). The rail 110 and the shoe 11 are configured to be switchable to a clamp release state (see FIG. 5) in which the rail 110 and the shoe 11 are spaced apart from each other with a gap CL. As shown in FIGS. 1 and 2, the wedge 12 at the upper end of the lever 10 is attached along the direction in which the rail 110 extends (longitudinal direction, Y direction). Further, as shown in FIG. 3, the wedge 12 has an inclined surface 12 a disposed on the side (inner side) where the pair of levers 10 (wedge 12) face each other, and the upward direction which is the extension direction of the compression spring member 20. The inclined surface 12a is attached to the inner side. The wedge 12 is an example of the “wedge-like member” in the present invention.

  As shown in FIG. 7, the wedge 12 includes an inclined surface 12 a and a mounting surface 12 b in which two screw holes 12 c are formed. The wedge 12 has a width W corresponding to the thickness of the lever 10 (length in the front-rear direction (Y direction)). Further, the thickness t of the wedge 12 at the lower end of the inclined surface 12a has a predetermined thickness in consideration of the amount of bending of the lever 10 caused by the pressing force (clamping force) being applied to the lever 10 in the clamped state. Is formed. The wedge 12 has a mounting surface 12b on the opposite side of the inclined surface 12a. As shown in FIG. 1, the mounting surface 12b is disposed at a predetermined position on the upper end of the lever 10 in two positions. The bolt 13 is attached to the lever 10 from the back side (mounting surface 12b side). The wedge 12 can be easily removed from the lever 10 by loosening the two bolts 13 and is configured to be replaceable.

  As shown in FIG. 4, the inclined surface 12 a of the wedge 12 abuts on a roller 23 which will be described later, and the lever 10 (wedge 12) is pushed outward by the inclination angle as the roller 23 moves upward. It is configured as follows. Due to the movement of the upper end of the lever 10 according to the inclination angle, the lever 10 rotates in the direction of the arrow R1 around the rotation shaft 41, and the shoe 11 clamps (presses) the rail 110. Note that the width WL of the rail 110 decreases due to wear over time. When the rail 110 is worn, the roller 23 is moved to the upper side of the inclined surface 12a and the wedge 12 is spread. For this reason, as shown in FIG. 8, in this embodiment, the inclined surface 12a includes a first inclined surface 121 that contacts the roller 23 when clamping the rail 110 in an initial state without wear, and a predetermined first wear. A second inclined surface 122 that comes into contact with the roller 23 when clamping the rail 110 in a state (about 1 mm worn state on one side), and a roller 23 when clamping the rail 110 in the second worn state (about 2 mm worn state on one side). And a third inclined surface 123 in contact therewith. The first inclined surface 121, the second inclined surface 122, and the third inclined surface 123 have different inclination angles α1, α2, and α3, respectively. In particular, in the present embodiment, the first inclined surface 121 has an inclination angle α1 that is larger than the inclination angle α2 of the second inclined surface 122. The roller 23 is an example of the “contact member” and “roller member” in the present invention. The inclination angle α1 is an example of the “first inclination angle” in the present invention. The inclination angle α2 is an example of the “second inclination angle” in the present invention. As an example, in the present embodiment, the inclination angles α1, α2, and α3 are set to about 12.3 degrees, about 10.5 degrees, and about 10.9 degrees, respectively. In FIG. 8, the tilt angle is exaggerated for easy understanding.

  As shown in FIG. 1, a total of four support rods 14 extending horizontally are provided on the front side (arrow Y1 direction side) and the rear side (arrow Y2 direction side) of the pair of levers 10, respectively. As shown in FIG. 2, these support rods 14 are provided so as to be separated from the inner surface of the bracket 2 with a slight gap, respectively, in the front-rear direction (Y direction) with respect to the bracket 2 of the internal unit 1. It is configured to limit the tilt.

  The compression spring member 20 is composed of a compression coil spring having a coil shape configured to be extendable in the vertical direction. As shown in FIGS. 2 and 4, the coil-shaped compression spring member 20 has an inner diameter D <b> 1 that is larger than the outer dimension D <b> 2 of the hydraulic cylinder 30, and in this embodiment, the hydraulic cylinder is disposed inside the compression spring member 20. 30 is accommodated. As shown in FIG. 4, the compression spring member 20 is provided on the lower member 21 provided on the upper surface of the fixed block 40 at a position between the pair of levers 10. The compression spring member 20 is provided so that the upper end surface is in contact with the lower surface of the roller unit 22. The compression spring member 20 is configured to urge the roller unit 22 upward. The roller unit 22 is an example of the “upper member” in the present invention.

  The roller unit 22 has a pair of rollers 23 that respectively contact the inclined surfaces 12 a of the wedges 12 provided on the pair of levers 10. The roller 23 is provided such that the rotation axis direction coincides with the width direction (front-rear direction (Y direction)) of the wedge 12, so that the roller 23 can rotate while being in contact with the inclined surface 12 a of the wedge 12. It is configured. When the roller unit 22 is pushed upward by the compression spring member 20, the pair of rollers 23 moves upward while rotating at the contact position with the inclined surface 12a of the wedge 12, and corresponds to the inclination angle of the inclined surface 12a. The upper end (inclined surface 12a) of the lever 10 is configured to be pushed outward (in the direction of arrow R1) by a predetermined amount.

  The hydraulic cylinder 30 is installed on the lower member 21 inside the compression spring member 20, and a rod 31 that is movable in the vertical direction by hydraulic pressure is connected to the roller unit 22 via a pair of connecting members 33 and 34. It is connected to. Specifically, the upper end portion 31 a of the rod 31 protrudes upward from a hole portion 22 b formed in the base portion 22 a of the roller unit 22 and is inserted into a pair of annular connecting members 33 and 34. Further, a screw portion is formed on the outer periphery of the upper end portion 31a of the rod 31, and a nut 35 is screwed. Since the roller unit 22 is biased upward by the compression spring member 20 from below, the roller unit 22 is locked via a pair of connecting members 33 and 34 by a nut 35 that is screwed into the upper end portion 31a. .

  Here, in the present embodiment, the upper connecting member 33 is in contact with the nut 35 screwed to the rod 31 on the upper surface side, and also has a first contact surface 33a formed of a spherical convex surface (see FIGS. 2 and 4). Have The lower connecting member 34 is in contact with the base 22a of the roller unit 22 on the lower surface side, and is a spherical concave surface that is slidably spherically contacted with the first contact surface 33a of the connecting member 33 (FIGS. 2 and 2). 4)). The hole 22 b of the base 22 a is formed to be slightly larger than the rod 31 so as to be slightly spaced from the rod 31, and the inner peripheral portion of the connecting member 34 is further spaced from the rod 31. Therefore, when the roller unit 22 is slightly tilted, the connecting member 34 slides along the spherical surface with respect to the connecting member 33, and the angle can be changed by the distance CL between the hole 22b and the rod 31. It is configured as follows. Thereby, even when the roller unit 22 is slightly inclined, the rod 31 itself is configured to be able to keep vertical.

  The hydraulic cylinder 30 has a cylindrical shape with an outer dimension D2. In the present embodiment, the hydraulic cylinder 30 completely overlaps the compression spring member 20 in the height direction (Z direction) except for a part of the tip (upper end) of the rod 31. That is, the hydraulic cylinder 30 having the height H2 is configured to be within the height range of the compression spring member 20 having the height H1 in the compressed state shown in FIG. The hydraulic cylinder 30 is driven by the hydraulic unit 3 to lower the rod 31 and pulls the roller unit 22 downward (in the direction of arrow Z2) against the upward biasing force of the compression spring member 20. Accordingly, the hydraulic cylinder 30 is configured to be able to compress the compression spring member 20 and release the clamp by the pair of levers 10.

  As shown in FIGS. 4 and 9, the fixed block 40 rotatably supports the pair of levers 10 via a pair of pivot shafts 41, and the compression spring member 20 via the lower member 21. And the hydraulic cylinder 30 is supported. The fixed block 40 has a function of supporting each part of these internal units 1. The pair of rotation shafts 41 are disposed on both sides in the lateral direction (X direction) orthogonal to the rail 110, and are provided so that the axial direction coincides with the rail 110. Accordingly, the pair of levers 10 can be rotated in the clamping direction (arrow R1 direction) or the clamp releasing direction (arrow R2 direction), respectively, with the rotation shaft 41 as the rotation center. The fixed block 40 is provided with one wheel 50 that can rotate on the rail 110. Thus, the internal unit 1 is configured to be movable along the rail 110 in the clamp release state.

  Specifically, as shown in FIG. 4, a wheel 50 is disposed at the center of the fixed block 40, and the wheel 50 is rotatably supported by a shaft 52 via a bearing 51. Both ends of the shaft 52 are supported by a pair of bolts 53 penetrating the fixed block 40 downward from the upper surface and a pair of nuts 54 fastened to the pair of bolts 53 on the lower surface side of the fixed block 40. Further, the shaft 52 is movable in the vertical direction relative to each bolt 53, and the shaft 52 is urged downward (on the nut 54 side) by a pair of suspension springs 55 provided on the pair of bolts 53, respectively. Has been. For this reason, the wheel 50 is configured to be movable relative to the fixed block 40 together with the shaft 52 and the bearing 51, and the pair of suspension springs 55 can absorb the vertical movement and impact during movement. The pair of suspension springs 55 have a function of releasing a load acting on the wheel 50 (bearing 51) due to a rotational moment caused by an external force acting at a position above the upper surface of the rail 110 during clamping. doing.

  As shown in FIGS. 2 and 3, a pair of guide claws 42 projecting downward and extending to both outer sides of the rail 110 are integrally formed on the lower surfaces of both ends in the front-rear direction (Y direction) of the fixed block 40. Provided. As shown in FIG. 10, the pair of guide claws 42 come into contact with the rail 110 when the internal unit 1 (fixed block 40) moves in the lateral direction (X direction) in the clamp released state, so that the internal unit 1 It has a function of restricting movement of the (fixed block 40). Here, the pair of guide claws 42 are not only used when the internal unit 1 (fixed block 40) horizontally moves in the horizontal direction (X direction) but also when the internal unit 1 (fixed block 40) moves in the horizontal direction (X direction). Also when it tilts more than a predetermined amount, it abuts on the rail 110. As a result, the wheels 50 of the internal unit 1 (fixed block 40) are prevented from being removed from the rail 110, and the internal unit 1 (fixed block 40) exceeds a predetermined angle in the lateral direction with respect to the rail 110. It is configured not to tilt. In the present embodiment, the center of gravity of the internal unit 1 is designed to be positioned on the rail 110 in the lateral direction (X direction). The predetermined lateral angle limited by the guide claw 42 is an angle at which the center of gravity position of the internal unit 1 in the X direction does not come off from the rail 110. Accordingly, the position of the center of gravity of the internal unit 1 is configured so as not to deviate from the upper side of the rail 110 within a range limited by the guide claws 42 of the fixed block 40. The guide claw 42 is an example of the “guide portion” in the present invention.

  Here, in the clamp release state, since the pair of levers 10 can be rotated around the rotation shaft 41, the lever 10 rotates with the inclination of the internal unit 1 (fixed block 40), and the shoe 11. May approach the rail 110. For this reason, in this embodiment, the rotation restricting pins 15 are provided at predetermined positions (positions near the rotation shaft 41) in the vicinity of the fixed block 40 of the pair of levers 10, respectively. When the lever 10 is rotated to a predetermined rotation position, the rotation limit pin 15 limits the rotation limit pin 15 so as not to contact the rib portion 43 of the fixed block 40 and further rotate the lever 10. It has a function. As shown in FIG. 10, the predetermined rotation position is larger than the rotation position of the lever 10 in the clamped state, and the internal unit 1 (fixed block 40) is inclined until the guide claw 42 comes into contact with the rail 110. In such a state (the state in which the internal unit 1 is tilted to the limit with respect to the rail 110), the shoe 11 on the side where the rotation limiting pin 15 contacts the fixed block 40 does not contact the rail 110. Is set to In FIG. 10, the rotation limiting pin 15 on the arrow X1 direction side contacts the rib portion 43 of the fixed block 40 so that the shoe 11 on the arrow X1 direction side does not contact the side surface of the rail 110 on the arrow X1 direction side. The state where the rotation of the lever 10 is restricted is shown. Thus, even when the fixed block 40 is tilted to the limit with respect to the rail 110 and the lever 10 is rotated, the shoe 11 of the lever 10 does not come into contact with the rail 110, and only when the shoe 11 is clamped with the rail 110. Wear of the shoe 11 can be suppressed by making it contact. The rotation limiting pin 15 is an example of the “rotation limiting unit” in the present invention.

  Further, as shown in FIG. 1, a holding spring 16 made of a coil spring that biases the levers 10 in the direction of closing the levers 10 is provided on the upper part of the pair of levers 10. Due to the biasing force of the holding spring 16, the wedge 12 (inclined surface 12 a) of the lever 10 is always in contact with the roller 23 even in the clamp release state. Therefore, even when the fixed block 40 is inclined in the lateral direction, the pair of levers 10 are integrally inclined while being restrained so as to keep the wedge 12 and the roller 23 in contact with each other. Since the center of gravity of the internal unit 1 does not deviate from the upper side of the rail 110 within the range limited by the guide claws 42 of the fixed block 40, the internal unit 1 itself can be restored even when the fixed block 40 is inclined to the limit with respect to the rail 110. The force is applied to return to the upright state, and the pair of levers 10 are also configured to return to the original state from the state in which the rotation limiting pin 15 abuts by the action of the holding spring 16.

  Further, as shown in FIG. 9, a protruding portion 44 that protrudes forward is formed on the front side of the center portion of the fixed block 40 (arrow Y1 direction side). The protrusion 44 has a flat plate shape extending in the horizontal direction. The protruding portion 44 is provided with a block-side limiting member 60 that limits the relative inclination of the fixed block 40 relative to the bracket 2 in the lateral direction. The block-side limiting member 60 is an example of the “fixed block-side limiting member” in the present invention.

  The block-side limiting member 60 has a frame shape in which a pair of inclination limiting plates 61 and 62 provided above and below the protruding portion 44 are connected to each other on both outer sides of the protruding portion 44 via a pair of spacers 63 (see FIG. 3). It has a structure. The pair of tilt limiting plates 61 and 62 have the same shape and are formed in a convex shape having a tip portion 61a (62a) having a small width when viewed in plan. The distance between the inclination limiting plates 61 and 62 is kept by the pair of spacers 63 so as to be slightly larger than the thickness of the protruding portion 44. For this reason, the block-side limiting member 60 is provided such that the protruding portion 44 is inserted into a space surrounded by a frame shape by the inclination limiting plates 61 and 62 and the pair of spacers 63. In addition, the width direction (X direction) size of the front end portion 61 a (62 a) of the inclination limiting plate 61 (62) is also larger than the width of the protruding portion 44. For this reason, the protrusion 44 and the block-side restriction member 60 can move relative to each other both in the vertical direction and in the lateral direction within a limit where the protrusion 44 contacts the block-side restriction member 60.

  Further, as shown in FIGS. 1 and 3, a pair of bracket-side limiting members 70 are provided on both lateral sides of the convex tip portions 61a (62a) of the inclination limiting plates 61 and 62 of the block-side limiting member 60. Is provided. The bracket-side limiting member 70 is an L-shaped plate member (see FIG. 6) as viewed from above, and is fixed to the inner side surface of the bracket 2 by bolts 71 so as to extend in the vertical direction. The pair of bracket-side limiting members 70 are provided so that the L-shaped upright portions are positioned on both sides of the convex tip portions 61 a (62 a) of the inclination limiting plates 61 and 62. Further, the pair of bracket-side limiting members 70 are disposed at a slight distance in the lateral direction from the convex tip portions 61a (62a) of the inclination limiting plates 61 and 62.

  As shown in FIGS. 11 to 13, the block-side restriction member 60 and the bracket-side restriction member 70 are formed when the fixed block 40 (inner unit 1) is inclined relative to the bracket 2 in the lateral direction. When the side restricting member 60 and the bracket side restricting member 70 come into contact with each other, the internal unit 1 has a function of restricting the inclination of the internal unit 1 with respect to the bracket 2.

  Specifically, as shown in FIG. 11, in a normal state with no inclination, the lower surface of the upper inclination limiting plate 61 of the block side limiting member 60 and the upper surface of the protruding portion 44 of the fixed block 40 are in contact with each other. . From here, for example, when considering the case where the fixed block 40 (inner unit 1) is inclined in the direction of arrow Q with respect to the bracket 2, the protrusion 44 and the inclination limiting plate 61 are in contact with each other. With the inclination of 44), the block side limiting member 60 is also inclined in the same arrow Q direction. As shown in FIG. 12, when the block-side limiting member 60 is tilted in the arrow Q direction, the tip end portion 61a of the upper tilt limiting plate 61 contacts one (arrow Q direction side) bracket-side limiting member 70 at the contact point Q1. And the front-end | tip part 62a of the lower inclination restriction | limiting board 62 contacts the bracket side restriction | limiting member 70 of the other (opposite side to arrow Q direction) at the contact point Q2. As a result of the tip 61a of the tilt limiting plate 61 and the tip 62a of the tilt limiting plate 62 coming into contact with the bracket-side limiting member 70 at the contact points Q1 and Q2, respectively, the block-side limiting member 60 may be further tilted in the arrow Q direction. become unable.

  Thereafter, as shown in FIG. 13, when the fixed block 40 (internal unit 1) is further tilted in the direction of the arrow Q, the block-side limiting member 60 cannot be tilted any further, so that only the protruding portion 44 is the block-side limiting member 60. And, it tilts in the direction of arrow Q with respect to the bracket side limiting member 70. As a result, the upper surface of the projecting portion 44 comes into contact with the lower surface of the upper tilt limiting plate 61 (tip portion 61a) at the corner contact point Q3, and the lower surface of the projecting portion 44 is lower at the corner contact point Q4. It abuts on the upper surface of the inclination limiting plate 62 (tip portion 62a). Thereby, the inclination of the fixed block 40 (internal unit 1) in the arrow Q direction is limited by the block-side limiting member 60, and the inclination of the block-side limiting member 60 in the arrow Q direction is limited by the bracket-side limiting member 70. As a result, the horizontal relative inclination between the internal unit 1 (fixed block 40) and the bracket 2 is limited within a predetermined range.

  Thus, in the clamp release state, the movement and inclination of the internal unit 1 (fixed block 40) in the lateral direction (X direction) with respect to the rail 110 are limited to a predetermined range by the guide claws 42 of the fixed block 40. Further, the relative inclination in the lateral direction (X direction) between the internal unit 1 (fixed block 40) and the bracket 2 is limited to a predetermined range by the block-side limiting member 60 and the bracket-side limiting member 70. In the actual operation (for example, when the rail clamp device 100 is moved by being pulled by the cargo handling machine), when the internal unit 1 moves or tilts in the lateral direction, the internal unit 1 (fixed block 40) and the rail 110 Both the positional relationship and the positional relationship between the internal unit 1 (fixed block 40) and the bracket 2 change. Therefore, actually, the lateral direction (X direction) of the internal unit 1 is caused by the interaction between the guide claw 42 of the fixed block 40 provided at different positions, the block side limiting member 60 and the bracket side limiting member 70. Inclination and movement are limited.

  Next, the clamp operation and the clamp release operation of the rail clamp device 100 according to the present embodiment will be described.

  As described above, the rail clamp device 100 having a fail-safe structure performs a clamping operation when the hydraulic cylinder 30 is not driven. As shown in FIG. 5, the wedges 12 (inclined surfaces 12 a) of the pair of levers 10 and the pair of rollers 23 corresponding to the pair of wedges 12 are always in contact with each other by the urging force of the holding spring 16. Yes. When the hydraulic cylinder 30 is not driven, the compression spring member 20 urges the roller unit 22 upward to push it up. As a result, the pair of rollers 23 moves upward while rotating in contact with the inclined surface 12a of the wedge 12 as the roller unit 22 moves upward, and the lever 10 moves by a predetermined amount according to the inclination angle of the inclined surface 12a. The upper end (inclined surface 12a) is pushed outward (in the direction of arrow R1). As a result, the lever 10 rotates in the direction of the arrow R1 around the rotation shaft 41 as the contact point between the roller 23 and the inclined surface 12a moves upward. As shown in FIG. 4, the upward movement of the roller unit 22 by the compression spring member 20 and the accompanying rotation of the lever 10 around the rotation shaft 41 causes the shoe 11 at the lower end of the lever 10 to contact the rail 110. Is stopped. At this time, the upward pushing force (biasing force) of the compression spring member 20 is transmitted to the lever 10 (shoe 11) via the roller 23 and the wedge 12. As a result, both sides of the rail 110 are gripped by the shoe 11 and a predetermined clamping force (pressing force) acts on the rail 110. In this way, the rail 110 is clamped by the lever 10, and this clamping force (pressing force) prevents the moving structure (such as a cargo handling machine) from running away.

  On the other hand, during the clamp release operation, the hydraulic cylinder 30 is driven by the hydraulic unit 3 to lower the rod 31 (retreat into the cylinder). At this time, the hydraulic cylinder 30 generates a driving force larger than the upward biasing force of the compression spring member 20, whereby the roller unit 22 connected to the tip (upper end) of the rod 31 causes the biasing force of the compression spring member 20. Descends against The wedge 12 (inclined surface 12a) of the pair of levers 10 and the pair of rollers 23 are always in contact with each other by the urging force of the holding spring 16, so that the wedge 12 (inclined) even when the roller unit 22 descends. While maintaining the state where the surface 12a) and the roller 23 are in contact, the upper ends (inclined surfaces 12a) of the pair of levers 10 are brought closer to each other (in the direction of the arrow R2) by a predetermined amount corresponding to the inclination angle of the inclined surface 12a. As a result, the lever 10 rotates in the direction of the arrow R2 around the rotation shaft 41 as the contact point between the roller 23 and the inclined surface 12a moves downward. As a result, as shown in FIG. 5, the shoe 11 clamped on both sides of the rail 110 is separated from the rail 110 as the lever 10 rotates in the arrow R2 direction, and the clamped state is released ( The clamp is released. The downward movement of the roller unit 22 by the hydraulic cylinder 30 and the accompanying rotation of the lever 10 around the rotation shaft 41 in the direction of the arrow R2 are stopped at the lower limit position of the hydraulic cylinder 30. And if the drive of the hydraulic cylinder 30 by the hydraulic unit 3 is stopped, it will switch to a clamp state by said clamp operation again. As described above, the clamp operation and the clamp release operation are performed.

  Next, the relationship between the shape of the wedge 12 (inclination angle of the inclined surface 12a) and the pressing force (clamping force) of the lever 10 against the rail 110 will be described.

  When the rail 110 is clamped by the above-described clamping operation, the width of the rail 110 to be clamped is not always constant, and the width may be different due to wear or the like. Specifically, when the rail 110 is in an initial state with no wear, as shown in FIG. 14A, the inclined surface 12a of the wedge 12 is contacted with the contact point p1 at the height h1 from the rotation shaft 41. It is assumed that the shoe 11 clamps the rail at a distance x1 from the rotation shaft 41 when the roller 23 comes into contact. On the other hand, when the rail 110 is worn by a predetermined amount dx, it is necessary to further rotate the lever 10 by the wear amount (dx). Therefore, as shown in FIG. 14B, the compression spring member 20 pushes up the roller 23 (roller unit 22) from the height h1 by the height dh. As a result, the shoe 11 clamps the worn rail 110 by being displaced further inward by a predetermined amount dx. At this time, the contact point between the inclined surface 12a of the wedge 12 and the roller 23 is p2. Further, the angle θ2 between the rotation shaft 41 and the contact point p2 is smaller by the rotation of the lever 10 than the angle θ1 between the rotation shaft 41 and the contact point p1 with respect to the vertical direction.

  Comparing the initial state (a) and the worn state (b) in FIG. 14, the worn state (b) has a larger extension amount of the compression spring member 20 (set length of the compression spring member 20). The roller 23 presses the higher position of the inclined surface 12a. For this reason, the urging force of the compression spring member 20 is reduced by the amount of extension of the compression spring member 20. Moreover, since the height of the contact point p2 of the wedge 12 is large by dh, the amount of bending of the lever 10 tends to increase. The contact angle between the inclined surface 12a of the wedge 12 and the roller 23 changes as the lever 10 rotates (and bends), and the horizontal component of the load applied to the inclined surface 12a (the load contributing to the rotation of the lever 10). Component) changes. For this reason, in the initial state (a) and the worn state (b), the clamping force (pressing force) of the rail 110 by the lever 10 is smaller in the worn state (b).

  Therefore, in order to obtain the required clamping force (pressing force) even in the worn state (b) of FIG. 14, it is necessary to design the rail clamp device based on the clamping force in the worn state (b). In this case, the clamping force (pressing force) in the initial state (a) becomes excessive, and the wear of the inclined surface 12a of the shoe 11 and the wedge 12 and the roller 23 increases.

  In the present embodiment, as shown in FIG. 8, the first inclination angle α <b> 1 of the first inclined surface 121 that contacts the roller 23 when the rail 110 in the initial state (a) is gripped among the inclined surfaces 12 a is predetermined. In the initial state, the roller 23 is configured to be larger than the second inclination angle α2 of the second inclined surface 122 that comes into contact with the roller 23 when the rail 110 in the wear state (1 mm wear state on one side) is gripped. The contact angle between the first inclined surface 121 and the first inclined surface 121 is larger than the contact angle between the roller 23 and the second inclined surface 122. At this time, as shown in FIG. 15, when the inclination angle of the inclined surface is large, the component S2 of the clamping direction (direction in which the lever is rotated toward the rail) of the force transmitted to the lever 10 in the case (b) is the inclined surface. Is smaller than the force clamping direction component S1 in (a). For this reason, in the initial state, the clamping direction component of the force transmitted to the lever 10 (the biasing force of the compression spring member 20) is relatively small. Thereby, even when it is configured to obtain a required pressing force (about 750 kN) in a 1 mm wear state on one side, it is possible to suppress the generation of an excessive pressing force (clamping force) in the initial state. In the present embodiment, the first inclined surface 121 (inclination angle α1) has a contact angle with the roller 23 of approximately α1 (about 12.3 degrees), the second inclined surface 122 (inclination angle α2), and the third inclined surface. 123 (inclination angle α3) is designed so that the contact angle with the roller 23 is about 10 degrees.

  In order to confirm the effect of the configuration in which the inclination angle of the wedge 12 (inclined surface 12a) is changed in the rail clamp device 100 according to the present embodiment, the angle of the inclined surface is constant (about 10 degrees) in both the initial state and the worn state. The clamping force was compared between (Comparative Example) and the rail clamp device 100 (Example) in which the inclination angle α1 of the first inclined surface 121 is larger than the inclination angle α2 of the second inclined surface 122. In both the comparative example and the example, the rail clamp device was designed such that a clamping force (pressing force) of 750 kN was obtained in a worn state with a one-side wear amount of 1 mm. As a result, the result shown in FIG. 16 was obtained. In FIG. 16, the vertical axis represents the pressing force (clamping force) of the lever (shoe) against the rail, and the horizontal axis represents the amount of wear on one side of the rail.

  As shown in FIG. 16, in the comparative example, a clamping force of about 900 kN is generated in the initial state where the rail wear amount is 0 mm, whereas in the example, the clamping force is 770 kN. Thus, in the rail clamp device 100 (example) configured such that the inclination angle α1 of the first inclined surface 121 is larger than the inclination angle α2 of the second inclined surface 122, the first inclined surface 121 and the roller 23 An increase in the clamping force (pressing force) in the initial state (0 mm wear) in contact with the wedge 12 could be suppressed. Moreover, in the rail clamp apparatus 100 (Example), compared with the comparative example in which the clamping force fluctuated in the range of about 900 kN to about 750 kN until the wear state of 1 mm, it is substantially constant at 770 kN to about 750 kN until the wear state of 1 mm. Has succeeded in generating a clamping force close to.

  In the present embodiment, as described above, the coiled compression spring member 20 that biases the pair of levers 10 and the coiled compression spring member 20 are disposed inside, and the compression spring member 20 is compressed to be paired. By providing the hydraulic cylinder 30 capable of releasing the clamp by the lever 10, the hydraulic cylinder 30 has a height position overlapping (overlaps) with the compression spring member 20 inside the coiled compression spring member 20. Can be arranged. Thereby, compared with the structure which arrange | positions a hydraulic cylinder above a spring member, the height of the rail clamp apparatus 100 is made small by the part which the compression spring member 20 and the hydraulic cylinder 30 overlap in the height direction (overlap). Thus, the apparatus can be reduced in size.

  In the present embodiment, as described above, the compression spring member 20 and the hydraulic cylinder 30 disposed inside the compression spring member 20 overlap in the height direction, and the hydraulic cylinder 30 is located inside the compression spring member 20. Is housed. If comprised in this way, size reduction of the rail clamp apparatus 100 can be easily achieved by the extent that the compression spring member 20 and the hydraulic cylinder 30 overlap in the height direction.

  In the present embodiment, as described above, the hydraulic cylinder 30 compresses the compression spring member 20 by moving the roller unit 22 toward the lower member 21 against the urging force of the compression spring member 20. Thus, the clamp by the pair of levers 10 is released. With this configuration, the clamp can be released simply by moving the roller unit 22 toward the lower member 21 against the urging force of the compression spring member 20, so that the clamp by the lever 10 can be released. There is no need to provide a link mechanism or the like. As a result, the apparatus configuration can be simplified as compared with the configuration in which the link mechanism is provided, and the rail clamp device 100 can be reduced in size by the amount that the link mechanism is not provided.

  In the present embodiment, as described above, the roller 23 moves upward so as to expand the inclined surface 12a by the expansion of the compression spring member 20 while abutting the inclined surface 12a of the wedge 12 also received by the lever 10. By rotating the pair of levers 10, the pair of levers 10 grips and clamps the rail 110. If comprised in this way, the urging | biasing force of the expansion | extension direction of the compression spring member 20 can be directly transmitted to a pair of lever 10 via the roller 23 and the inclined surface 12a. Accordingly, as compared with the configuration in which the biasing force of the spring member is transmitted by the link mechanism, the link mechanism is not provided between the compression spring member 20 (roller 23) and the lever 10 (inclined surface 12a of the wedge 12). The size of the apparatus can be reduced. For example, when the compression spring member moves the contact member downward from above the pair of levers, it is necessary to provide a support member for supporting the compression spring from above, while the roller 23 is provided with the compression spring member 20. By extending the pair of levers 10 by moving the pair of levers 10 by extension of the rails, there is no need to provide a support member above the pair of levers 10, so that the height of the rail clamp device 100 is reduced. Thus, the size of the apparatus can be reduced.

  In the present embodiment, as described above, the wedges 12 having the inclined surfaces 12 a are attached to the pair of levers 10 so as to be replaceable, and come into contact with the inclined surfaces 12 a of the wedges 12 attached to the pair of levers 10. A roller 23 configured to be rotatable while being in contact with the inclined surface 12a is provided. If comprised in this way, while the wedge 12 in which the inclined surface 12a in which the urging | biasing force of the compression spring member 20 acts can be formed can be replaced | exchanged easily, the roller 23 rotates by contacting with the inclined surface 12a. Friction due to contact between the roller 23 and the inclined surface 12a (wedge 12) can be suppressed, and wear of the roller 23 and the wedge 12 can be reduced.

  Further, in the present embodiment, as described above, when the fixing block 40 is disposed at both sides of the rail 110 and is tilted in the lateral direction orthogonal to the rail 110 in the clamp release state, the rail 110 is in contact with the fixing. A guide claw 42 for restricting the inclination of the block 40 is provided in the fixed block 40. With this configuration, even when the fixed block 40 is inclined in the lateral direction due to distortion or bending of the rail 110, the rail pawl device 100 is inclined more than a certain amount by the guide claw 42 coming into contact with the rail. , Can limit the fall.

  In the present embodiment, as described above, the lever 10 (shoe 11) is in a state in which the fixed block 40 is inclined in the lateral direction with respect to the rail 110 and the guide claw 42 is in contact with the rail 110 in the clamp released state. A rotation limiting pin 15 is provided to limit the rotation of the lever 10 at a predetermined rotation position where the rail 10 does not contact the rail 110. If comprised in this way, even if the guide claw 42 inclines until it abuts on the rail 110 in the clamp release state, the lever 10 can be prevented from coming into contact with the rail 110 by the rotation limiting pin 15. Accordingly, it is possible to prevent the lever 10 from coming into contact with the rail 110 in the clamp released state, and the rail gripping portion (the shoe 11) of the lever 10 from being worn (consumed).

  In the present embodiment, as described above, one wheel 50 of the fixed block 40 is disposed at a position between the pair of levers 10. With this configuration, the rail clamp device 100 can be provided by simply supporting the pair of levers 10 so as to be rotatable and providing one wheel 50 on the fixed block 40 that supports the compression spring member 20 and the hydraulic cylinder 30. Can be movable. Further, unlike the case where a plurality of wheels are provided outside the rail clamp device 100, the structure of the moving mechanism including the wheels 50 can be simplified and the entire rail clamp device 100 can be downsized. Also in this case, the guide pawl 42 of the fixed block 40 can prevent the wheel 50 from being removed from the rail 110, so that it is not necessary to provide a wheel for preventing the wheel 50 from being removed.

  In the present embodiment, as described above, the block-side limiting member 60 is provided on the fixed block 40, and the bracket-side limiting member 70 is provided on the bracket 2. When the fixed block 40 tilts laterally with respect to the bracket 2, the block-side limiting member 60 and the bracket-side limiting member 70 come into contact with each other, so that the horizontal tilt of the fixed block 40 with respect to the bracket 2 is limited. It is configured. If comprised in this way, each part (internal unit 1) supported by the fixed block 40 and the fixed block 40 via the bracket 2 attached to moving structures, such as a cargo handling machine (crane etc.) and an opening-and-closing roof, is a moving structure. In the configuration of moving together with the object, the relative inclination between the bracket 2 and the fixed block 40 can be easily limited by the contact between the block-side limiting member 60 and the bracket-side limiting member 70.

  In the present embodiment, as described above, the inclined surface 12a of the wedge 12 has the clamping force (pressing force) when the rail 110 in the initial state is gripped as the rail 110 in a predetermined wear state (1 mm wear on one side). The inclination angle α1 at the contact position (first inclined surface 121) with the roller 23 when gripping the rail 110 in the initial state is set to a predetermined wear state so as to approach the clamping force (pressing force) when gripping It is configured to be different from the inclination angle α2 at the contact position (second inclined surface 122) with the roller 23 when gripping the rail 110 on one side (1 mm wear). With this configuration, the pressing force on the rail 110 in the initial state can be lowered so as to approach the pressing force in a predetermined wear state (1 mm wear on one side), so the pressing force on the rail 110 in the initial state Can be prevented from becoming too high (too large).

  Further, in the present embodiment, as described above, the roller unit 22 and the rod 31 have a spherical shape in which the connecting member 33 having the first contact surface 33a and the first contact surface 33a are slidably spherically contacted. It is connected via a connecting member 34 having a second contact surface 34a made of a concave surface. With this configuration, the urging force of the compression spring member 20 varies in the horizontal direction (for example, the upper urging force varies between the Y1 direction side and the Y2 direction side in FIG. 2), and the roller unit 22 slightly changes. Even when tilted, the rod 31 itself can be kept vertical, and the distributed urging force is transmitted to the rod 31 via the first contact surface 33a and the second contact surface 34a that make spherical contact, so the rod 31 The load in the lateral direction (bending direction) applied to the can be reduced.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above embodiment, as an example of a moving structure using a rail clamp device, a container crane (loading machine) and a dome-type open / close roof used for loading and unloading containers used in harbors and the like are illustrated. The present invention is not limited to this. The present invention is applicable to any rail clamp device used for any moving structure other than a container crane and a dome-type open / close roof, as long as it is a rail clamp device used for a moving structure moving along a rail. .

  Moreover, in the said embodiment, although the example of the rail clamp apparatus provided with one internal unit containing a pair of lever, a compression spring member, and a hydraulic cylinder was shown, this invention is not limited to this. In this invention, it is good also as the rail clamp apparatus 200 provided with two internal units like the modification shown in FIG. In the modified example of FIG. 17, the rail clamp device 200 includes two internal units 201a and 201b, a bracket 202 that accommodates the two internal units 201a and 201b, and the hydraulic unit 3. The configuration of the two internal units 201a and 201b is the same as the internal unit 1 of the above embodiment. In the rail clamp device 200 according to this modified example, the rail clamping force can be doubled (for example, 750 kN × 2 = 1500 kN) by including two internal units. In the rail clamp device according to the present invention, the size of the device can be reduced. Therefore, even if two internal units are provided as in this modification, it is possible to suppress an increase in size of the entire device.

  Moreover, in the said embodiment, although the example using a hydraulic cylinder was shown as an example of the clamp release mechanism of this invention, this invention is not limited to this. In the present invention, an electric clamp release mechanism may be provided, or another clamp release mechanism other than the hydraulic type and the electric type may be provided.

  In the above embodiment, the hydraulic cylinder is configured to completely overlap the compression spring member in the height direction except for a part of the tip (upper end) of the rod. It is not limited to this. In the present invention, the hydraulic cylinder may be provided so as to partially overlap the compression spring member.

  Moreover, although the example which provided the compression spring member on the lower member provided on the upper surface of the fixed block was shown in the said embodiment, this invention is not limited to this. For example, the fixed block and the lower member may be integrally formed so that the fixed block also serves as the lower member. And you may install a compression spring member on a fixed block so that the lower end of a compression spring member may touch the fixed block upper surface.

  Moreover, although the example which attached the wedge which has an inclined surface to a pair of lever was shown in the said embodiment, this invention is not limited to this. In the present invention, an inclined surface may be formed directly on the lever itself without providing a wedge.

  Moreover, in the said embodiment, although the example which provided the 1st inclined surface from which an inclination angle differs, a 2nd inclined surface, and a 3rd inclined surface was shown in the inclined surface, this invention is not limited to this. In the present invention, the inclined surface may be, for example, only the first inclined surface and the second inclined surface, or may be provided with four or more inclined surfaces having different inclination angles. Further, the inclined surface may have a constant inclination angle. The inclined surface may be formed in a curved surface shape. In this case, by continuously changing the inclination angle of the inclined surface, the pressing force (clamping force) of the lever against the rail may be maintained substantially constant regardless of the rail wear state. In addition, the inclination angles α1 (about 12.3 degrees), α2 (about 10.5 degrees), and α3 (about 10.9 degrees) in the above embodiment are examples, and may be inclination angles other than the above-described inclination angles. .

  Further, in the above embodiment, the first inclined surface 121 is set so that the pressing force of the lever when gripping the rail in the initial state is close to the pressing force when gripping the rail in a predetermined wear state (1 mm wear on one side). Although an example in which the inclination angle α1 is configured to be larger than the inclination angle α2 of the second inclined surface 122 is shown, the present invention is not limited to this. For example, the inclination angle of the first inclined surface (contact position with the roller when gripping the rail in the initial state) is set as the inclination angle of the second inclined surface (contact position with the roller when gripping the worn rail). May be made smaller.

  In the above embodiment, the predetermined wear state is based on the state where one side of the rail is worn by 1 mm (one side is worn by 1 mm), and the pressing force in the initial state is brought close to the pressing force in the one side worn state by 1 mm (about 750 kN). Although the example in which the inclination angle of the inclined surface is set is shown, the present invention is not limited to this. For example, the pressing force on the third inclined surface 123, which is the contact position between the inclined surface and the roller in the 2 mm wear state on one side, may be used as a reference. It is arbitrary how much wear state (for example, 1.5 mm on one side, 2 mm on one side, etc.) is set as the predetermined wear state. In this case, the inclination angle α2 of the second inclined surface 122 is made larger than the inclination angle α3 of the third inclined surface 123, and the inclination angle α1 of the first inclined surface 121 is made larger than the inclination angles α2 and α3. May be. With this configuration, it is possible to equalize the pressing force in the 1 mm wear state on one side and the pressing force in the initial state on the basis of the pressing force (clamping force) in the 2 mm wear state on one side.

  Moreover, in the said embodiment, although the example which provided the roller which can be rotated while contacting with an inclined surface was shown as an example of the contact member of this invention, this invention is not limited to this. In the present invention, a non-rotatable columnar or cylindrical contact member may be provided. Moreover, the contact member which has the fan-shaped cross section formed in the curved surface shape only in the contact part with the inclined surface side may be sufficient. Moreover, the contact member which has cross-sectional shapes, such as a rectangle and a hexagon, may be sufficient.

  Moreover, in the said embodiment, while providing a block side limitation member and a bracket side limitation member, a fixed part is provided with a protrusion part, contact | abutting of a protrusion part and a block side restriction member, a block side restriction member, and a bracket side restriction | limiting Although the structure which restrict | limits the inclination of the internal unit with respect to a bracket by contact | abutting with a member was shown, this invention is not limited to this. In the present invention, for example, the block-side limiting member may be fixed to a fixed block (projecting portion), and the inclination of the internal unit may be limited only by contact between the block-side limiting member and the bracket-side limiting member. .

  Moreover, in the said embodiment, although the example which provided one wheel inside the fixed block was shown, this invention is not limited to this. In the present invention, a plurality of wheels may be provided. Moreover, you may each provide in front and back of a bracket, for example, without providing a wheel in a fixed block.

  Moreover, although the example which provided the holding spring which consists of a coil spring which urges | biases a pair of lever in the direction which mutually closes was shown in the said embodiment, this invention is not limited to this. For example, a pair of levers and a roller unit are connected to each other via a leaf spring and a pin, and the pair of levers are biased by these leaf springs in a direction approaching the roller unit (a direction in which the levers close to each other). May be.

  In the above embodiment, an example is shown in which the wedge width W is configured to substantially match the thickness of the lever (length in the front-rear direction (Y direction)), but the present invention is not limited to this. In the present invention, the width of the wedge may be smaller than the thickness of the lever. In this case, since the wedges can be easily replaced, the maintainability can be improved. A plurality of wedges having a small width may be provided.

  Moreover, in the said embodiment, although the example which provided a pair of guide nail | claw integrally in the fixed block was shown, this invention is not limited to this. In the present invention, the guide claw may be provided separately from the fixed block, and the guide claw may be detachably attached to the fixed block. In this case, even when the guide claw is worn due to contact with the rail, the guide claw can be easily replaced.

  Moreover, although the example which provided the protrusion part for attaching a block side limitation member in the fixed block was shown in the said embodiment, this invention is not limited to this. For example, as shown in FIG. 2, instead of providing the protrusion 44 on the fixed block 40, a protrusion may be provided on the lower member 21.

  Moreover, although the example which provided the bracket side limitation member which consists of an L-shaped plate-shaped member was shown in the said embodiment, this invention is not limited to this. In the present invention, a square steel having a rectangular cross section other than the L-shape may be used as the bracket-side limiting member.

1, 100a, 100b Internal unit 2 Bracket 10 Lever 12 Wedge (Wedge-shaped member)
12a Inclined surface 15 Rotation restriction pin (rotation restriction part)
20 Compression spring member 21 Lower member 22 Roller unit (upper member)
23 Roller (contact member, roller member)
30 Hydraulic cylinder (clamp release mechanism)
33 connecting member 33a first contact surface 34 connecting member 34a second contact surface 40 fixed block 42 guide claw (guide portion)
50 wheels 60 block side limiting member (fixed block side limiting member)
70 Bracket side limiting member 100, 200 Rail clamp device 121 First inclined surface 122 Second inclined surface α1 Inclination angle (first inclination angle)
α2 tilt angle (second tilt angle)

Claims (11)

A pair of levers that can be rotated around a rotation axis to grip and clamp the rail from both sides;
A coiled compression spring member that biases the pair of levers so that the pair of levers rotate in a direction to grip and clamp the rails;
Wherein is arranged inside the coiled compression spring members, Bei example and can clamp release mechanism thereby releasing the clamp by the compression spring member and the pair of levers by compressing,
The compression spring member and the clamp release mechanism disposed inside the compression spring member overlap in the height direction, and the clamp release mechanism is provided so as to be accommodated inside the compression spring member. , Rail clamp device. An upper member and a lower member contacting the upper and lower ends of the compression spring member, respectively;
The clamp release mechanism compresses the compression spring member to release the clamp by the pair of levers by moving the upper member toward the lower member against the biasing force of the compression spring member. is configured, the rail clamping device according to claim 1. An upper surface of the pair of levers is provided with an inclined surface that is inclined with respect to the extension direction of the compression spring member,
A contact member that is provided at a position below the inclined surface, moves with expansion and contraction of the compression spring member, and further contacts an inclined surface of the pair of levers;
The pair of levers are moved by rotating the pair of levers by moving upward so as to push and spread the inclined surface by extension of the compression spring member while the contact member is in contact with the inclined surface of the lever. It is configured to clamp to grip the rail, rail clamping device according to claim 1 or 2. It is attached to the pair of levers in a replaceable manner, and further includes a wedge-shaped member having the inclined surface,
The abutment member is configured to contact the inclined surface of the pair of the wedge-shaped member attached to the lever, the an inclined surface abuts while rotatably configured roller member, according to claim 3 Rail clamp device. The pair of levers is rotatably supported, and further includes a fixing block that supports the compression spring member and the clamp release mechanism.
The fixed block is disposed at a position on both sides of the rail, and when the fixed block moves in a lateral direction perpendicular to the rail in a clamp-released state, the fixed block abuts on the rail to limit the movement of the fixed block. The rail clamp device according to any one of claims 1 to 4 , comprising a guide portion. Each of the pair of levers has a rotation limiting portion that contacts the fixed block and limits the rotation of the lever,
The rotation restricting portion has a predetermined position in which the lever does not contact the rail when the fixed block is inclined laterally with respect to the rail and the guide portion is in contact with the rail in a clamp released state. The rail clamp device according to claim 5 provided so that rotation of said lever may be restricted in a lever rotation position. One wheel is rotatably supported by the fixed block, and rotates on the rail along the rail.
The rail clamp device according to claim 5 or 6 , wherein the one wheel is disposed at a position between the pair of levers. A fixed block that supports the pair of levers rotatably and supports the compression spring member and the clamp release mechanism,
A bracket that is attached to a moving structure that moves along the rail and that houses the fixed block therein;
The fixed block has a fixed block side limiting member,
The bracket has a bracket side limiting member that contacts the fixed block side limiting member,
When the fixed block is inclined in the lateral direction with respect to the bracket, the fixed block side limiting member and the bracket side limiting member are in contact with each other, so that the horizontal inclination of the fixed block with respect to the bracket is limited. The rail clamp device according to any one of claims 1 to 7 , which is configured. The inclined surface approaches the pressing force of the lever against the rail when gripping the rail in an initial state to be close to the pressing force of the lever against the rail when gripping the rail in a predetermined wear state. The inclination angle at the contact position with the contact member when gripping the rail in the initial state is different from the inclination angle at the contact position with the contact member when gripping the rail in the predetermined wear state. The rail clamp device according to claim 3 or 4 constituted. The inclined surface is in contact with the contact member when gripping the rail in the initial state, and is in contact with the contact member when gripping the rail in a predetermined wear state. The rail clamp device according to claim 9 , wherein a first inclination angle of the first inclined surface is larger than a second inclination angle of the second inclined surface. An upper member and a lower member contacting the upper and lower ends of the compression spring member, respectively;
The clamp release mechanism includes a cylinder installed on the lower member, and a rod provided so as to be able to advance and retract in the vertical direction from the cylinder and having an upper end connected to the upper member
The upper member and the rod include a first abutting surface made of a spherical convex surface and a second abutting surface made of a spherical concave surface that makes spherical contact with the first abutting surface so as to be movable. The rail clamp device according to any one of claims 1 to 10 , wherein the rail clamp device is connected via a connecting member.

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