JP2017001861A - Jack-up device of work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jack-up device of a work machine, with a simple structure, capable of firmly retaining a state where a jack cylinder and a float are connected to each other.SOLUTION: The jack-up device includes first and second holding levers 10a, 10b. A lever portion 27 of the first holding lever 10a includes: first and second axis portions 30a, 30b serving as axes of rotation of the lever portion; and an arm portion 31 for generating elastic deformation so as to exhibit spring force that directs the first holding lever 10a toward a restrained position when the first holding lever 10a is disposed at a retracted position. A lever portion 37 of the second holding lever 10b includes: third and fourth axis portions 40a, 40b serving as axes of rotation of the lever portion; and an arm portion 41 for generating elastic deformation so as to exhibit spring force that directs the second holding lever 10b toward the restrained position when the second holding lever 10b is disposed at the retracted position.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a jack-up device for a work machine.

  2. Description of the Related Art Conventionally, a jack-up device that is provided on a working machine such as a crane or an excavator and jacks up the working machine is known. For example, Patent Document 1 below shows an example of such a jack-up device.

  Patent Document 1 discloses an outrigger provided in a truck crane as an example of a jack-up device. This outrigger has a telescopic beam provided so as to project sideways from the body frame of the truck crane, an extendable leg provided with the telescopic direction at the tip of the telescopic beam, and a jack-up time. A float for grounding and an attachment device for attaching the float to the lower end of the telescopic leg are provided.

  The lower end of the telescopic leg is provided with a small diameter part so as to protrude downward from the lower end part, and a spherical large diameter part having a larger diameter than the small diameter part is provided so as to protrude further downward from the small diameter part. It has been. The float has a flange extending in the vertical direction, and a concave surface for receiving the spherical large diameter portion is formed at the top end of the flange.

  The attachment device has a pair of engaging claws with an operating lever attached to a bracket at the top end portion of the float barrel. The pair of engaging claws with an operating lever has a small diameter on the outer periphery of the small diameter portion of the lower end portion of the telescopic leg in a state where the spherical large diameter portion of the lower end portion of the telescopic leg is in contact with the concave surface of the top end portion of the float barrel. The state where the float is attached to the lower end portion of the telescopic leg is held by engaging from the opposite sides with the portion interposed therebetween. Each engaging claw is attached to the bracket of the float via a shaft extending in the horizontal direction. Each engaging claw protrudes inward in the radial direction of the float barrel and engages with the outer periphery of the small-diameter portion at the lower end of the telescopic leg, and is disengaged from the outer periphery of the small-diameter portion and It can be rotated around the axis between a retracted position and a retracted position.

  Further, a tension spring is installed between each engaging claw and the float bracket. Each engagement claw is always urged to the rotation position side (engagement position side) that protrudes inward in the radial direction of the float barrel by the spring force of the tension spring. When the telescopic legs extend downward and the spherical large diameter portion pushes the vicinity of the tip of each engagement claw downward, each engagement claw rotates to the retracted position side against the spring force of the tension spring, When the spherical large-diameter portion further descends and exceeds the engaging claw, each engaging claw rotates to the engaging position by the spring force of the tension spring and engages with the outer periphery of the small-diameter portion at the lower end of the telescopic leg. . With the configuration as described above, the outrigger of Patent Document 1 can firmly hold the state in which each engagement claw is securely engaged with the lower end portion of the jack cylinder and the jack cylinder and the float are connected to each other. ing.

Japanese Utility Model Publication No. 63-73290

  However, in the outriggers of Patent Document 1, it is necessary to attach two shafts supporting the respective engaging claws to the bracket of the float so that the respective engaging claws can rotate, and the respective engaging claws are biased. There is a problem in that the structure is complicated because it is necessary to construct a tension spring for the purpose between each engaging claw and the bracket of the float.

  An object of the present invention is to provide a jack-up device for a working machine that can firmly hold a state in which a jack cylinder and a float are connected to each other with a simple configuration.

  The present invention provides a jackup device provided in a work machine for jacking up the work machine. This jack-up device is a float that is grounded when jacking up the work machine, and can be attached to and detached from the float, and the float is extended in the vertical direction with the float attached to a lower end portion, whereby the float serves as a base point. A jack cylinder for jacking up a work machine, and a pair of holding levers provided at one of the upper end of the float and the lower end of the jack cylinder, the upper end of the float and the jack The other portion of the lower end portion of the cylinder with respect to the one portion is a narrow portion having a predetermined width in a specific direction that is a horizontal direction, and the narrow portion located on the one portion side of the narrow portion. A large portion having a width in the specific direction that is larger than the predetermined width, and of both side surfaces of the small width portion in the specific direction An engagement surface that is connected from the edge on the large portion side to the edge on the narrow portion side of the both sides of the large portion in the specific direction, and facing the one portion side and the opposite side, The pair of holding levers includes a lever portion provided at the one portion so as to be rotatable around a horizontal axis, and an engaging portion provided at the lever portion so as to be rotatable together with the lever portion. And the engaging portions of the pair of holding levers are disposed so as to sandwich the small width portion from both sides in the specific direction, and engage the engaging surface with the other portion. A restraint position that is a pivot position restrained by the one part, and a pivot position where the pair of holding levers are separated from each other than the restraining position, and between the engaging portions of the pair of holding levers An interval through which the large portion can pass is formed. The lever portion is rotatable between a retraction position that is a rotation position, and the lever portion has a shaft portion serving as a rotation shaft of the lever portion, and a radial direction of rotation of the lever portion from the shaft portion. And an arm portion that extends outward and is connected to the engagement portion, and generates elastic deformation that generates a spring force that moves the holding lever toward the restraining position when the holding lever is disposed at the retracted position. (Claim 1).

  In this jack-up device, since the lever portion of each holding lever has a shaft portion that serves as a rotation axis of the holding lever, a support shaft that supports the holding lever is provided so that each holding lever can be rotated. There is no need to provide it separately. For this reason, the structure of a jackup apparatus can be simplified. Further, in this jack-up device, the lever portion of each holding lever is elastically deformed so as to generate a spring force that moves the holding lever toward the restraining position when the holding lever is disposed at the retracted position. Since the arm portion is provided, each holding lever can be firmly held at the restraining position by the spring force generated by the arm portion. For this reason, the pair of holding levers can firmly hold the other portion of the upper end portion of the float and the lower end portion of the jack cylinder, and firmly hold the connected state. Moreover, since the arm portion of the lever portion that is a part of each holding lever generates the spring force, there is no need to separately provide a spring member or the like for applying this spring force to each holding lever. Therefore, in this jack-up device, the jack cylinder and the float can be firmly held with a simple configuration.

  In the jack-up device, the pair of holding levers protrude from the one part to the other part side, and are in a rotational position closer to each other than the restraining position, and the elasticity of the arm portion It is possible to turn to a neutral position which is a turning position where the deformation is restored, and the other part is located on the one part side of the large part and has a tip surface facing the one part side. The front end surface of the pair of holding levers when the pair of holding levers are pressed against the engaging portions of the pair of holding levers at the neutral position from the opposite side. It is preferable to have a shape that guides to the outside of the large portion in the specific direction by moving along the tip surface so as to be divided to the outside of the tip surface in the specific direction. 2).

  In this configuration, when the upper end portion of the float is connected to the lower end portion of the jack cylinder, the distal end surface of the other portion is connected to the engaging portion of the pair of holding levers in the neutral position from the side opposite to the one portion. By simply pressing, the engaging portions of the pair of holding levers can be divided and moved to both sides in the specific direction and guided to both outer sides of the large portion, and the pair of holding levers can be rotated to the retracted position. Then, by bringing the other part closer to the one part side until the engaging part of the pair of holding levers exceeds the engaging surface, the pair of holding levers are rotated to the restrained position by the spring force of the arm part. The lower end portion of the jack cylinder and the upper end portion of the float can be connected to each other by moving the pair of holding levers. That is, in this configuration, the lower end portion of the jack cylinder and the upper end portion of the float are connected to each other only by bringing the other portion closer to one portion of the lower end portion of the jack cylinder and the upper end portion of the float. be able to. For this reason, the connection operation | work of the upper end part of the float with respect to the lower end part of a jack cylinder can be simplified.

  In this case, the engaging portion is a roller portion supported by the arm portion so as to be rotatable around the axis in a posture in which the axial direction is parallel to the horizontal axis, and the distal end surface is pressed against the engaging portion. If it is, it rolls on the tip surface to the outside of the tip surface, and the other part is further brought closer to the one part side to roll on the side surface of the large-diameter portion to engage the It is preferable that it is a roller part engaged with a surface (Claim 3).

  According to this configuration, when the distal end surface of the other part is pressed against the engaging portion of the pair of holding levers in the neutral position, the roller portion as the engaging portion rolls on the distal end surface. It can move smoothly to the outside of the tip surface. For this reason, the pair of holding levers can be smoothly rotated to the retracted position in accordance with the operation of pressing the distal end surface of the other part against the engaging portion of the pair of holding levers. In addition, the pair of holding levers rotate to the retracted position and the roller portions of the pair of holding levers are guided to the outside of the large portion, and each roller portion is pressed against the side surface of the large portion by the spring force of the arm portion. When the other part is further brought closer to the one part side in the state of being in a state, each roller part rolls smoothly on the side surface of the large part, so that it smoothly moves to the engagement surface side and moves to the engagement surface. Can be engaged.

  In the jack-up device, the one part includes a first attachment hole and a second attachment hole that are provided separately at positions facing opposite sides in the extending direction of the horizontal axis on the outer surface of the one part. The horizontal axis extends out of the outer surface of the one portion and is disposed apart from the first mounting hole and the second mounting hole in a vertical direction and a predetermined direction orthogonal to the direction in which the horizontal axis extends. A third mounting hole and a fourth mounting hole provided separately at positions facing each other in the direction, wherein the second mounting hole is the first mounting hole in the predetermined direction with respect to the first mounting hole. The fourth mounting hole is arranged eccentrically toward the outside of the one part with respect to the third mounting hole in the predetermined direction, and the pair of holding levers is arranged. The first holding lever, which is one of the holding levers, includes a first shaft portion inserted into the first mounting hole and a second shaft portion inserted into the second mounting hole. The arm portion of the first holding lever extends from the first shaft portion to the outside in the radial direction of the rotation of the lever portion of the first holding lever, and the first holding lever is provided as the shaft portion. A first arm portion that generates a torsional deformation that generates a first spring force that is directed toward the restraint position side, and extends outward in the radial direction of the rotation of the lever portion of the first holding lever from the second shaft portion. And a second arm portion that generates a torsional deformation so as to generate a second spring force that moves the first holding lever toward the opposite side of the restraining position, and the first holding lever is disposed at the retracted position. Sometimes the first spring force is applied to the elastic deformation of the arm part. The lever portion of the second holding lever, which is the torsional deformation generated in the first arm portion and the second arm portion so as to be larger than the second spring force, and is the other holding lever of the pair of holding levers. Has a third shaft portion inserted into the third mounting hole and a fourth shaft portion inserted into the fourth mounting hole as the shaft portion, and the arm portion of the second holding lever is The torsional deformation that generates a third spring force that extends from the third shaft portion to the outside in the radial direction of the rotation of the lever portion of the second holding lever and causes the second holding lever to move toward the restraining position. And a third arm portion extending from the fourth shaft portion to the outside in the radial direction of the rotation of the lever portion of the second holding lever, and moving the second holding lever toward a side opposite to the restraining position. A fourth arm portion that causes torsional deformation to generate four spring forces; Elastic deformation that occurs in the arm portion when the second holding lever is disposed at the retracted position, the third arm portion so that the third spring force is greater than the fourth spring force. And torsional deformation generated in the fourth arm portion.

  According to this configuration, when the first holding lever is disposed at the retracted position, the second spring force due to the torsional deformation of the second arm portion and the first arm portion due to the torsional deformation of the first arm portion that is greater than the second spring force. The spring force of the arm portion of the first holding lever that causes the first holding lever to move toward the restraint position can be generated by the difference from the one spring force. Further, when the second holding lever is disposed at the retracted position, a fourth spring force due to the torsional deformation of the fourth arm portion and a third spring force due to the torsional deformation of the third arm portion larger than the fourth spring force Due to this difference, the spring force of the arm portion of the second holding lever that causes the second holding lever to move toward the restraint position can be generated. Therefore, a specific configuration of each holding lever provided with an arm portion that generates a spring force that moves the holding lever toward the restraining position when the holding lever is disposed at the retracted position can be obtained.

  As described above, according to the present invention, it is possible to provide a jack-up device for a working machine that can firmly hold the state in which the jack cylinder and the float are connected to each other with a simple configuration.

It is the figure which looked at the working machine provided with the jackup apparatus by one Embodiment of this invention from the front. It is a partial cross section figure which shows partially in the state which looked at the connection part vicinity of the lower end part of the rod of a jack cylinder, and the upper end part of a float from the side. FIG. 3 is a partial cross-sectional view partially showing a vicinity of a connecting portion between a lower end portion of a rod of a jack cylinder and an upper end portion of a float as seen from a direction orthogonal to a direction seen in FIG. 2. It is a partial cross section figure which shows a float and a pair of holding lever provided in it in the state seen from the top. It is a figure which shows operation | movement of the jackup apparatus when attaching a float to the rod of a jack cylinder. It is a figure which shows operation | movement of the jackup apparatus when attaching a float to the rod of a jack cylinder. It is a figure which shows operation | movement of the jackup apparatus when attaching a float to the rod of a jack cylinder. It is a figure which shows operation | movement of the jackup apparatus when attaching a float to the rod of a jack cylinder. It is a figure which shows operation | movement of the jackup apparatus when attaching a float to the rod of a jack cylinder. It is a figure which shows operation | movement of the jackup apparatus when attaching a float to the rod of a jack cylinder. It is a figure which shows operation | movement of the jackup apparatus when removing a float from the rod of a jack cylinder. It is a figure which shows operation | movement of the jackup apparatus when removing a float from the rod of a jack cylinder.

  Hereinafter, a jack-up device 2 for a working machine according to an embodiment of the present invention will be described with reference to FIGS.

  The jack-up device 2 according to the present embodiment is provided in the lower traveling body 102 of the working machine 100 as shown in FIG. 1, and jacks up the entire working machine 100 including the lower traveling body 102 and the upper swinging body 104. belongs to. In the present embodiment, the work machine 100 is a crawler crane and includes a crawler type lower traveling body 102. The lower traveling body 102 includes a track frame 110 that supports the upper swing body 104 of the work machine 100 from below and supports the crawler frame of a pair of left and right crawler traveling apparatuses 106.

  Two jack-up devices 2 are provided at the front end of the track frame 110 as shown in FIG. Similarly, two jack-up devices (not shown) are also provided at the rear end (not shown) of the track frame 110. The two jackup devices 2 provided at the front end of the track frame 110 are configured symmetrically. Further, the two jackup devices provided at the rear end of the track frame 110 are configured to be bilaterally symmetric and configured to be symmetrical with the two jackup devices 2 provided at the front end of the track frame 110. Has been. Hereinafter, the configuration of one jack-up device 2 among the four jack-up devices 2 provided in the track frame 110 will be described as a representative.

  The jack-up device 2 includes a beam 4, a jack cylinder 6, a float 8, and a pair of holding levers 10 (see FIG. 2).

  The beam 4 (see FIG. 1) is attached to the track frame 110, and projects from the track frame 110 to support the jack cylinder 6.

  The jack cylinder 6 is a hydraulic cylinder, and is supported by the distal end portion of the beam 4 in a posture in which the expansion and contraction direction is the vertical direction (vertical direction). The jack cylinder 6 is detachable from the float 8 and extends up and down in a state where the float 8 is attached to the lower end portion, thereby jacking up the lower traveling body 102 (track frame 110) with the float 8 as a base point. The jack-up is performed in a state where the upper swing body 104 is mounted on the lower traveling body 102. As shown in FIG. 1, the jack cylinder 6 includes a cylinder body 12 and a rod 13.

  The cylinder body 12 is configured in a cylindrical shape, and is inserted so that the rod 13 can advance and retreat in the axial direction. The cylinder body 12 and the rod 13 are arranged coaxially, and are arranged in such a posture that their axial directions are in the vertical direction. The cylinder body 12 is supported by the tip of the beam 4, and a rod 13 advances from the cylinder body 12 downward. The rod 13 advances and retreats with respect to the cylinder body 12 when hydraulic oil is supplied to the cylinder body 12 from a hydraulic oil supply device (not shown).

  The rod 13 is a straight rod-shaped rod body 15 (see FIG. 1) inserted into the cylinder body 12, a small-diameter portion 16 (see FIG. 2) extending downward from the lower end of the rod body 15, and a lower end of the small-diameter portion 16. 2 has a large-diameter portion 17 (see FIG. 2) extending further downward (see FIG. 2), and a tip 18 (see FIG. 2) protruding downward from the lower end of the large-diameter portion 17 (float 8 side). . The rod body 15, the small diameter portion 16, the large diameter portion 17 and the tip end portion 18 are integrally formed. Further, the rod body 15, the small diameter portion 16, the large diameter portion 17 and the tip portion 18 are formed so that a cross section perpendicular to the axial direction (vertical direction) thereof is circular, and is disposed coaxially. Yes. The small diameter portion 16 is an example of a small width portion in the present invention, and the large diameter portion 17 is an example of a large portion in the present invention.

  The small diameter portion 16 has a predetermined width in a specific direction that is a horizontal direction. In other words, the small diameter part 16 has a predetermined width corresponding to the diameter of the small diameter part 16 in a specific direction orthogonal to the axial direction of the small diameter part 16. The width (diameter) of the small diameter portion 16 is smaller than the width (diameter) of the rod body 15 in the same direction.

  The large diameter portion 17 has a width in the same direction that is larger than the width of the small diameter portion 16 in the specific direction. In other words, the large diameter portion 17 has a diameter larger than the diameter of the small diameter portion 16 in the specific direction orthogonal to the axial direction of the large diameter portion 17.

  Further, the lower end portion of the rod 13 extends from the edge on the large diameter portion 17 side of both side surfaces of the small diameter portion 16 in the specific direction to the small diameter portion 16 side of both side surfaces of the large diameter portion 17 in the specific direction. It has an engaging surface 19 (see FIG. 2) that is connected to the edge and faces upward (opposite the float 8 side). In other words, the engagement surface 19 is an end surface on the small diameter portion 16 side of the large diameter portion 17, and spreads radially outward from an end edge on the large diameter portion 17 side of the outer peripheral surface of the small diameter portion 16. It is a surface connected to the edge on the small diameter portion 16 side in the outer peripheral surface of the diameter portion 17. Around the small diameter portion 16, a groove portion 20 surrounded by the engagement surface 19, the lower end surface of the rod body 15 and the outer peripheral surface of the small diameter portion 16 is formed.

  The distal end portion 18 has a distal end surface 18a that is located on the lower side (float 8 side) of the large diameter portion 17 and faces downward. When the distal end surface 18a is pressed from above with respect to the engaging portions 28 and 38 of a pair of holding levers 10 at a neutral position described later, the distal end surfaces 18a push the engaging portions 28 and 38 of the pair of holding levers 10 into the distal ends. It has a shape that is moved along the surface 18a so as to be separated to both outer sides of the tip end surface 18a in the specific direction and led to both outer sides of the large-diameter portion 17 in the specific direction. Specifically, the front end surface 18a has its center portion positioned on the lowermost side and gradually approaches the large-diameter portion 17 side toward both outer sides (radially outer sides) in the specific direction, and the outer edge thereof is the large-diameter portion. 17 has a spherical shape connected to the lower end of the outer peripheral surface.

  The float 8 is grounded while being attached to the lower end portion of the rod 13 when the lower traveling body 102 (track frame 110) is jacked up, and serves as a base point for jackup. By mounting the float 8 on the lower end of the rod 13, a large ground contact area can be secured, and the lower traveling body 102 can be stably jacked up and supported.

  As shown in FIG. 10, the float 8 has a receiving portion 21 at its upper end portion that receives the lower end portion of the rod 13 when the float 8 is attached to the lower end portion of the rod 13. The receiving portion 21 is formed in a disc shape, and is arranged such that the plate surface faces the vertical direction and the outer peripheral surface faces the side. On the plate surface (upper surface) facing the upper side of the receiving portion 21, a concave surface portion 22 that is a concave curved surface corresponding to the shape of the tip end surface 18 a of the rod 13 is formed. As shown in FIG. 4, the concave surface portion 22 has a circular concave shape as viewed from above, and is arranged so that the center thereof coincides with the axis O of the receiving portion 21 and the axis of the float 8. When the receiving part 21 receives the lower end part (front end part 18) of the rod 13, the front end face 18a of the rod 13 fits into and comes into contact with the concave surface part 22 (see FIG. 10).

  A first mounting hole 23 a and a second mounting hole 23 b for mounting a first holding lever 10 a (described later) of the pair of holding levers 10, A third mounting hole 23c and a fourth mounting hole 23d for mounting the second holding lever 10b (described later) are formed (see FIGS. 2 to 4).

  The first and second mounting holes 23a, 23b and the third and fourth mounting holes 23c, 23d are arranged separately on both sides with the axis O of the receiving portion 21 in between. That is, the first mounting hole 23a and the third mounting hole 23c are spaced apart from each other in the axial direction (vertical direction) of the float 8 and the horizontal direction perpendicular to the axial direction of rotation of the holding levers 10a and 10b. In addition, the second mounting hole 23b and the fourth mounting hole 23d are spaced apart from each other in the same direction as the separating direction of the first mounting hole 23a and the third mounting hole 23c. The first and second mounting holes 23a and 23b are provided in a region on the right side with respect to the axis O of the receiving portion 21 when the float 8 is viewed from above as shown in FIG. Similarly, 23c and 23d are provided in a region on the left side with respect to the axis O of the receiving portion 21 when the float 8 is viewed from above.

  The first mounting hole 23 a and the second mounting hole 23 b are respectively arranged at positions facing opposite sides in the right region of the outer peripheral surface of the receiving portion 21. The first mounting hole 23a and the second mounting hole 23b are arranged eccentrically from each other by a distance e (see FIG. 2) in the same direction as the separation direction of the first mounting hole 23a and the third mounting hole 23c. In other words, the first mounting hole 23a and the second mounting hole 23b are a distance in the horizontal direction perpendicular to the axial direction (vertical direction) of the float 8 and the extending direction of the first and second mounting holes 23a and 23b. Only e is arranged eccentrically.

  The third mounting hole 23c and the fourth mounting hole 23d are respectively arranged at positions facing opposite sides in the left region of the outer peripheral surface of the receiving portion 21. The third mounting hole 23c and the fourth mounting hole 23d are arranged eccentrically from each other by a distance e (see FIG. 2) in the same direction as the distance between the first mounting hole 23a and the third mounting hole 23c. In other words, the third mounting hole 23c and the fourth mounting hole 23d are in a horizontal direction perpendicular to the axial direction (vertical direction) of the float 8 and the extending direction of the third and fourth mounting holes 23c and 23d. The first mounting hole 23a and the second mounting hole 23b are arranged eccentric to each other by an eccentric distance e equal to the eccentric distance e. The third and fourth mounting holes 23c and 23d pass through the middle between the third and fourth mounting holes 23c and 23d and the first and second mounting holes 23a and 23b, and the axis O of the receiving portion 21. It is comprised so that it may become symmetrical with the 1st and 2nd attachment holes 23a and 23b with respect to the intermediate surface which passes through.

  The pair of holding levers 10 (see FIG. 2) is provided in the receiving portion 21 at the upper end portion of the float 8. The pair of holding levers 10 are for attaching the upper end portion (receiving portion 21) of the float 8 to the lower end portion of the rod 13 of the jack cylinder 6. The pair of holding levers 10 includes a first holding lever 10a and a second holding lever 10b.

  The first holding lever 10a can be rotated together with the lever portion 27 attached to the first and second attachment holes 23a and 23b of the receiving portion 21 so as to be rotatable around the horizontal axis. It has the engaging part 28 provided in the said lever part 27 so that it may become. Further, the second holding lever 10b is rotated together with the lever portion 37 attached to the third and fourth attachment holes 23c and 23d of the receiving portion 21 so as to be rotatable around the horizontal axis, and the lever portion 37. It has the engaging part 38 provided in the said lever part 37 so that it may become possible.

  The first holding lever 10a and the second holding lever 10b are disposed so that the engaging portions 28 and 38 sandwich the small-diameter portion 16 at the lower end portion of the rod 13 from both sides in a specific direction that is the horizontal direction. A restraint position (see FIG. 9) that is a rotational position that engages with the surface 19 and restrains the upper end portion of the float 8 to the lower end portion of the rod 13, and the first holding lever 10a and the second holding lever from the restraining position. 10b is a rotational position where they are separated from each other, and an interval through which the large diameter portion 17 of the rod 13 can pass is formed between the engaging portion 28 of the first holding lever 10a and the engaging portion 38 of the second holding lever 10b. It is possible to rotate between the retracted position (refer to FIG. 7 and FIG. 8) which is the rotational position.

  Further, the first holding lever 10a and the second holding lever 10b protrude from the upper end portion (the receiving portion 21) of the float 8 to the upper side (the rod 13 side) and are in a rotational position closer to each other than the restraining position. It can be turned to a neutral position (see FIG. 5). Further, the first holding lever 10a and the second holding lever 10b are rotatable to a dead center position (see FIG. 11) that is rotated by 90 ° in a direction away from the neutral position.

  The lever portion 27 of the first holding lever 10a is obtained by bending round steel (spring steel) into a substantially C shape. As shown in FIG. 3, the lever portion 27 includes a first shaft portion 30 a, a second shaft portion 30 b, and an arm portion 31.

  The first shaft portion 30a and the second shaft portion 30b serve as pivot axes of the lever portion 27 of the first holding lever 10a. The first shaft portion 30a and the second shaft portion 30b are portions corresponding to both end portions of the lever portion 27 disposed so as to be separated from each other and face each other, and are disposed so that their axial directions are the same direction. ing. The first shaft portion 30a is inserted into the first mounting hole 23a so as to be rotatable around its axis, and the second shaft portion 30b is secondly configured so as to be rotatable around its axis. It is inserted in the mounting hole 23b. Thereby, the lever part 27 can be rotated with respect to the receiving part 21 around the first and second shaft parts 30a, 30b. Further, the first shaft portion 30a and the second shaft portion 30b correspond to the eccentric distance between the first mounting hole 23a and the second mounting hole 23b in a state of being inserted into the first mounting hole 23a and the second mounting hole 23b. It is eccentric by the distance you want.

  The arm portion 31 extends from the first and second shaft portions 30 a and 30 b to the outside in the radial direction of the rotation of the lever portion 27 and is connected to the engaging portion 28. In the state where the first and second shaft portions 30a and 30b are removed from the first and second mounting holes 23a and 23b, the arm portion 31 has the shaft center of the first shaft portion 30a and the shaft center of the second shaft portion 30b. And have a shape that coincides with each other. The arm portion 31 having this shape is elastic so that the first shaft portion 30a and the second shaft portion 30b are decentered by an amount corresponding to the eccentric distance e in the eccentric direction between the first mounting hole 23a and the second mounting hole 23b. In this state, the first shaft portion 30a and the second shaft portion 30b are inserted into the corresponding ones of the first mounting hole 23a and the second mounting hole 23b, respectively.

  The arm portion 31 has a spring force (A direction) that moves the first holding lever 10a toward the restraint position side (neutral position side) when the first holding lever 10a is disposed at the retracted position (see FIGS. 7 and 8). Elastic deformation that generates a spring force). The spring force generated by the arm portion 31 increases as the eccentric distance between the first shaft portion 30a and the second shaft portion 30b increases, and increases as the diameter of the round steel forming the lever portion 27 increases. As shown in FIG. 3, the arm part 31 includes a first arm part 31 a, a second arm part 31 b, and a support part 32.

  The first arm portion 31 a is bent with respect to the first shaft portion 30 a and extends outward from the first shaft portion 30 a in the radial direction of the rotation of the lever portion 27. The second arm portion 31b is bent with respect to the second shaft portion 30b and extends outward from the second shaft portion 30b in the radial direction of rotation of the lever portion 27. The first arm portion 31a and the second arm portion 31b extend substantially in the same direction.

  As described above, the elastic deformation caused in the arm portion 31 in order to insert the first shaft portion 30a and the second shaft portion 30b into the first mounting hole 23a and the second mounting hole 23b, This corresponds to torsional deformation around the axis of each of the two arm portions 31b. This torsional deformation of the first arm portion 31a is a torsional deformation that generates a first spring force that moves the first holding lever 10a from the retracted position side to the restraining position side (neutral position side), and torsion of the second arm portion 31b. The deformation is a torsional deformation that generates a second spring force that moves the first holding lever 10a from the restraint position side (neutral position side) to the retracted position side. When the first holding lever 10a is in the neutral position (see FIG. 5), the first spring force due to the torsional deformation of the first arm portion 31a and the second spring force due to the torsional deformation of the second arm portion 31b are suspended. Yes. Therefore, in a state where the first holding lever 10a is in the neutral position, the arm portion 31 as a whole has a spring force that moves the first holding lever 10a from the neutral position in one of the rotational directions. It is in a stable state that does not emit.

  Further, when the first holding lever 10a is disposed at the retracted position (see FIGS. 7 and 8), elastic deformation that occurs in the arm portion 31, that is, the first holding lever 10a is directed to the restraining position side (neutral position side). The elastic deformation of the arm portion 31 that generates a dodging spring force causes the first arm portion 31a and the second arm portion 31a and the second arm portion 31b so that the first spring force of the first arm portion 31a is larger than the second spring force of the second arm portion 31b. This corresponds to torsional deformation that occurs in the arm portion 31b. Specifically, as the first holding lever 10a rotates from the neutral position to the retracted position side, the torsional deformation of the first arm portion 31a increases, while the torsional deformation of the second arm portion 31b decreases. As a result, the first spring force of the first arm portion 31a that moves the first holding lever 10a toward the neutral position is more than the second spring force of the second arm portion 31b that moves the first holding lever 10a toward the retracted position. growing. The difference between the first spring force of the first arm portion 31a and the second spring force of the second arm portion 31b causes the spring force of the arm portion 31 to move the first holding lever 10a toward the restraint position side (neutral position side). It is supposed to be emitted as. In the state where the first holding lever 10a is in the neutral position, the elastic deformation generated in the arm portion 31 when the first holding lever 10a is disposed in the retracted position is in a restored state.

  Further, when the first holding lever 10a is in the dead center position (see FIG. 11), when the lever portion 27 is viewed along the axial direction of the first and second shaft portions 30a and 30b, the first shaft portion 30a, the 2nd axial part 30b, and the support part 32 are arrange | positioned so that it may line up on the straight line extended in a horizontal direction. Further, in this state, the first holding lever 10a protrudes laterally from the receiving portion 21. In a state where the first holding lever 10a is at the dead center position, the first arm portion 31a and the second arm portion 31b of the lever portion 27 cause the first holding lever 10a to move from the dead center position in any of the upward and downward rotation directions. It does not generate power, but is in an unstable balance. When the first holding lever 10a is pivoted in any direction up or down from the dead center position, the balance is lost, and the arm portion 31 emits a spring force in the pivoted direction. ing.

  That is, in a state where the first holding lever 10a is in a rotation position (retracted position) between the dead center position and the neutral position, the arm portion 31 applies a spring force that moves the first holding lever 10a toward the neutral position side. To emit. Further, in a state where the first holding lever 10a is in the rotational position opposite to the neutral position with respect to the dead center position, the arm portion 31 causes the spring force to move the first holding lever 10a toward the opposite side to the neutral position side. To emit.

  The support portion 32 (see FIG. 3) supports the roller portion 28a so that a roller portion 28a (described later) as the engagement portion 28 can rotate about its axis. The support part 32 extends linearly in a direction orthogonal to the first and second arm parts 31a and 31b, and the end part of the first arm part 31a opposite to the first shaft part 30a and the first arm part 31a. Of the two arm portions 31b, the second shaft portion 30b is connected to the opposite end. The support portion 32 passes through the outermost side of the lever portion 27 in the radial direction of the rotation when the lever portion 27 rotates about the first and second shaft portions 30a and 30b.

  The engaging portion 28 is engaged with the engaging surface 19 of the lower end portion of the rod 13 in a state where the first holding lever 10a is disposed at the restraining position (see FIG. 9). In the present embodiment, the engaging portion 28 is a cylindrical roller portion 28a. The roller portion 28a is supported by the support portion 32 of the arm portion 31 so that the roller portion 28a can be rotated around its axis in a posture in which the axial direction is parallel to the horizontal axis that is the rotation axis of the lever portion 27. . Specifically, the support portion 32 is inserted into the cylindrical roller portion 28a, so that the roller portion 28a is supported by the support portion 32 so as to be rotatable about its axis. The roller portion 28a is smaller than the width of the groove portion 20 in the axial direction (vertical direction) of the rod 13 and the distance from the outer peripheral surface of the small diameter portion 16 to the outer peripheral surface of the large diameter portion 17 in the radial direction of the rod 13 It has a diameter equal to or less than the depth of the groove 20 in the radial direction. When the front end surface 18a of the rod 13 is pressed, the roller portion 28a rolls on the front end surface 18a to the outside of the front end surface 18a, and the lower end portion of the rod 13 is made closer to the upper end portion side of the float 8. As a result, it rolls on the outer peripheral surface (on the side surface) of the large-diameter portion 17 and engages with the engagement surface 19.

  As shown in FIGS. 2 and 4, the second holding lever 10 b is attached to the third and fourth attachment holes 23 c and 23 d of the receiving portion 21. The second holding lever 10b passes through the middle between the first and second mounting holes 23a, 23b and the third and fourth mounting holes 23c, 23d, and the intermediate surface passing through the axis O of the receiving portion 21. The first holding lever 10a is configured symmetrically. The second holding lever 10b rotates to the restraining position, the retracting position, the neutral position, and the dead center position that are symmetrical to the restraining position, the retracting position, the neutral position, and the dead center position of the first holding lever 10a with respect to the intermediate surface. It is possible.

  The second holding lever 10b has a lever portion 37 and an engaging portion 38 similar to the lever portion 27 and the engaging portion 28 of the first holding lever 10a. In the present embodiment, the engaging portion 38 of the second holding lever 10b is a roller portion 38a configured similarly to the roller portion 28a as the engaging portion 28 of the first holding lever 10a. The lever portion 37 of the second holding lever 10b includes a third shaft portion 40a and a fourth shaft portion 40b similar to the first shaft portion 30a, the second shaft portion 30b, and the arm portion 31 of the lever portion 27 of the first holding lever 10a. And an arm portion 41.

  The third shaft portion 40a and the fourth shaft portion 40b serve as pivot axes of the lever portion 37 (second holding lever 10b). The third shaft portion 40a is inserted into the third mounting hole 23c in the same form as the first shaft portion 30a is inserted into the first mounting hole 23a. The fourth shaft portion 40b is inserted into the fourth mounting hole 23d in the same form as the second shaft portion 30b is inserted into the second mounting hole 23b. Thereby, the lever part 37 can be rotated with respect to the receiving part 21 around the third and fourth shaft parts 40a, 40b.

  The arm portion 41 includes a third arm portion 41a, a fourth arm portion 41b, and a support portion 42 similar to the first arm portion 31a, the second arm portion 31b, and the support portion 32 of the arm portion 31 of the first holding lever 10a. .

  Next, the operation of the jack-up device 2 when the float 8 is attached to and detached from the rod 13 of the jack cylinder 6 will be described with reference to FIGS. 5-12, the lower end part of the rod 13 and the float 8 are shown in the cross section along those axial directions.

  First, when the float 8 is mounted on the rod 13, the jack cylinder 6 is placed in a contracted state, that is, the rod 13 is retracted into the cylinder body 12, and the float 8 is placed directly below the jack cylinder 6. At this time, the first and second holding levers 10a and 10b are in the neutral position.

  Next, the jack cylinder 6 extends to move the rod 13 downward from the cylinder body 12. Thereby, as shown in FIGS. 5 and 6, the lower end portion of the rod 13 is lowered, and the engaging portions 28, 38 (roller portion 28a) of the first and second holding levers 10a, 10b in which the tip end surface 18a is in the neutral position. , 38a). As a result, the roller portions 28a and 38a roll on the distal end surface 18a so as to be separated to both outer sides of the distal end surface 18a along the distal end surface 18a, and to both outer sides of the large diameter portion 17 as shown in FIG. Led. As a result, the first and second holding levers 10a and 10b rotate in directions away from each other from the neutral position, and reach the retracted position beyond the restraint position.

  Then, as shown in FIG. 8, the rod 13 further advances downward so that the lower end portion of the rod 13 further approaches the upper end portion side of the float 8, and accordingly, the roller portions 28 a, 38 a of the large diameter portion 17. It rolls on the outer peripheral surface of the large diameter portion 17 on both outer sides. At this time, the roller portions 28a and 38a are formed on the large-diameter portion 17 by the spring force of the arm portions 31 and 41 (spring force in the A direction) that causes the holding levers 10a and 10b to move toward the restraint position side (neutral position side). It is pressed against the outer peripheral surface.

  Then, the rod is positioned to the relative position where the roller portions 28a, 38a are disposed above the engaging surface 19 of the rod 13, that is, the relative position where the roller portions 28a, 38a are within the range of the vertical width of the groove portion 20 of the rod 13. When the lower end portion of 13 and the upper end portion of the float 8 approach each other, the roller portions 28a and 38a are fitted into the groove portion 20 by the spring force of the corresponding arm portions 31 and 41 and engaged with the engagement surface 19 (see FIG. 9). Thereby, the 1st and 2nd holding lever 10a, 10b is arrange | positioned in a restraint position. As a result, the upper end portion of the float 8 is restrained with respect to the lower end portion of the rod 13 by the first and second holding levers 10 a and 10 b, and the float 8 is connected to the rod 13. Thereafter, the lower end portion of the rod 13 is lowered to a position where the front end surface 18a fits into the concave surface portion 22 of the receiving portion 21 of the float 8 (see FIG. 10), and the mounting operation of the float 8 on the rod 13 is completed.

  On the other hand, when the float 8 is removed from the rod 13, the first and second holding levers 10 a and 10 b in the restraining position are moved against the spring force of the respective arm portions 31 and 41, exceeding the retracted position and moving toward the dead center position. (See FIG. 11). At this time, the first and second holding levers 10a and 10b are rotated to a position beyond the dead center position. As a result, the arm portions 31 and 41 generate a spring force (a spring force in the B direction) that causes the first and second holding levers 10a and 10b to move from the dead center position to the side opposite to the neutral position. The first and second holding levers 10a and 10b rotate to a position where the roller portions 28a and 38a abut against the side surface of the float 8 positioned below the receiving portion 21 as shown in FIG. In this state, the jack cylinder 6 contracts to raise the rod 13, whereby the lower end of the rod 13 is separated from the float 8. As described above, the operation of removing the float 8 from the rod 13 is performed.

  In the present embodiment, the lever portion 27 of the first holding lever 10a has a first shaft portion 30a and a second shaft portion 30b that serve as rotation axes of the first holding lever 10a. Since the lever portion 37 has the third shaft portion 40a and the fourth shaft portion 40b that serve as the rotation axes of the second holding lever 10b, the first and second holding levers 10a and 10b can be turned. It is not necessary to separately provide support shafts for supporting the first and second holding levers 10a and 10b. For this reason, the structure of the jackup apparatus 2 can be simplified.

  In the present embodiment, the lever portions 27 and 37 of the first and second holding levers 10a and 10b move the first and second holding levers 10a and 10b from the retracted position side to the restrained position side (neutral position side). Arm portions 31 and 41 that cause elastic deformation to generate a spring force to be directed are provided. Therefore, when the first and second holding levers 10a and 10b are arranged at the restraining positions, the first and second holding levers 10a and 10b can be firmly held at the restraining positions by the spring force of the arm portions 31 and 41. . For this reason, the upper end of the float 8 is firmly restrained by the first and second holding levers 10a and 10b with respect to the lower end of the rod 13 of the jack cylinder 6, and the lower end of the rod 13 and the upper end of the float 8 are The state where they are connected to each other can be firmly held. Moreover, since the arm portions 31 and 41 of the lever portions 27 and 37 that are a part of the first and second holding levers 10a and 10b generate the spring force, this spring force is used as the first and second holding levers 10a and 10b. There is no need to separately provide a spring member or the like. Therefore, in this embodiment, it is possible to obtain the jackup device 2 that can firmly hold the state in which the rod 13 of the jack cylinder 6 and the float 8 are connected to each other with a simple configuration.

  In the present embodiment, when the upper end of the float 8 is connected to the lower end of the rod 13 of the jack cylinder 6, the engaging portions 28, 38 of the first and second holding levers 10a, 10b at the neutral position are connected. By simply pressing the tip end surface 18a of the rod 13 from the upper side, the engaging portions 28 and 38 are divided and moved to both sides in the specific direction and guided to both outer sides of the large-diameter portion 17, and the first and second holding levers 10a. , 10b can be rotated to the retracted position. Then, the first and second holding levers 10 a and 10 b are moved to the arm portion 31 by further bringing the lower end portion of the rod 13 closer to the upper end portion side of the float 8 until the engaging portions 28 and 38 exceed the engaging surface 19. , 41 is rotated to the restraining position by the spring force of 41, and the lower end portion of the rod 13 and the upper end portion of the float 8 can be connected to the first and second holding levers 10a, 10b. That is, in the present embodiment, the lower end portion of the rod 13 and the upper end portion of the float 8 can be connected to each other only by bringing the lower end portion of the rod 13 close to the upper end portion of the float 8 in the vertical direction. For this reason, the connection operation | work of the upper end part of the float 8 with respect to the lower end part of the rod 13 can be simplified.

  In the present embodiment, since the engaging portions 28 and 38 of the first and second holding levers 10a and 10b are the roller portions 28a and 38a, the first and second end surfaces 18a of the rod 13 are in the neutral position. 2 When pressed against the engaging portions 28, 38 of the holding levers 10a, 10b, the roller portions 28a, 38a roll on the front end surface 18a so that they can smoothly move to both outer sides of the front end surface 18a. . Therefore, the first and second holding levers 10a and 10b are turned to the retracted position side when the front end surface 18a of the rod 13 is pressed against the engaging portions 28 and 38 of the first and second holding levers 10a and 10b. Can be done smoothly.

  Further, the first and second holding levers 10a and 10b rotate to the retracted position, and the roller portions 28a and 38a are guided to both outer sides of the large diameter portion 17, and the roller portions 28a and 38a are arm portions 31 and 41, respectively. When the lower end portion of the rod 13 is further brought closer to the upper end portion side of the float 8 while being pressed against the outer peripheral surface (side surface) of the large diameter portion 17 by the spring force of each of the large diameter portions 17, By rolling on the outer peripheral surface of this, it can move smoothly to the engagement surface 19 side and engage with the engagement surface 19.

  If the roller portions 28a and 28b have a diameter corresponding to the vertical width of the groove portion 20 of the rod 13, the entire first and second holding levers 10a and 10b have a large diameter corresponding to the vertical width of the groove portion 20. The lever portions 27 and 37 can be formed of a relatively small diameter round steel. For this reason, it can prevent that the spring force of the arm parts 31 and 41 becomes excessive, and the burden concerning the operation | work which carries out the elastic deformation of the arm part 31 and mounts to the 1st and 2nd attachment holes 23a and 23b of the float 8. And the burden concerning the operation | work which attaches to the 3rd and 4th attachment holes 23c and 23d of the float 8 by elastically deforming the arm part 41 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 includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  In the embodiment, the first and second holding levers 10 a and 10 b are provided at the upper end portion of the float 8, and the small diameter portion 16, the large diameter portion 17, the distal end surface 18 a and the engagement surface 19 are at the lower end portion of the rod 13. Although provided, the portion where the first and second holding levers 10a and 10b are provided and the portion where the small diameter portion 16, the large diameter portion 17, the tip surface 18a and the engagement surface 19 are provided may be interchanged. That is, a small diameter portion, a large diameter portion, a tip surface, and an engagement surface may be provided at the upper end portion of the float 8, and the first and second holding levers may be provided at the lower end portion of the rod 13. In this case, the configuration of the small-diameter portion, the large-diameter portion, the tip surface, and the engagement surface is reversed upside down from the configuration of the small-diameter portion 16, the large-diameter portion 17, the tip surface 18a, and the engagement surface 19, and the first The configuration of the first and second holding levers may be reversed upside down from the configuration of the first and second holding levers 10a and 10b described above.

  Further, the first mounting hole 23a and the second mounting hole 23b are arranged eccentrically with each other in the vertical direction and in a specific direction (horizontal direction) orthogonal to the axial direction of the rotation of the first holding lever 10a. They may be arranged eccentrically in the vertical direction. Further, in addition to the third mounting hole 23c and the fourth mounting hole 23d being arranged eccentrically with respect to each other in a vertical direction and a specific direction (horizontal direction) orthogonal to the rotation axial direction of the second holding lever 10b, They may be arranged eccentrically in the vertical direction.

  Further, the engaging portions 28 and 38 of the first and second holding levers 10a and 10b are not necessarily the roller portions 28a and 38a. That is, the engaging portions 28 and 38 of the first and second holding levers 10 a and 10 b are in sliding contact with the distal end surface 18 a of the rod 13 and the outer peripheral surface of the large diameter portion 17, and the distal end surface 18 a and the large diameter portion thereof. It may move along 17 outer peripheral surfaces.

  Moreover, in the said embodiment, while the lower end part of the rod 13 has the small diameter part 16 in which the cross section orthogonal to an axial direction is circular as an example of the small width part in this invention, it is orthogonal to an axial direction as an example of the large part in this invention. Although the cross section to be provided has the circular large diameter portion 17, it is not necessarily limited to this configuration. That is, the lower end portion of the rod may have a narrow portion and a large portion whose cross section perpendicular to the axial direction has a shape other than a circle. In other words, the small width part may have a shape such that the width in the specific direction is different from the width in the horizontal direction other than the specific direction. Further, if the large portion has a width in the same direction larger than the width of the small width portion in the specific direction, the large portion has a shape such that the width in the horizontal direction other than the specific direction is different. May be. In this case, the engaging surface is formed between the edge on the large portion side of the side surface of the narrow portion in the specific direction and the edge on the narrow portion side of the corresponding side surface of the large portion in the specific direction. It suffices to be formed, and it is not necessarily formed in other portions.

  Moreover, the narrow part of the lower end part of a rod may have the width | variety in the same direction more than the width | variety in the said specific direction of the rod main body of the upper side. Specifically, the small diameter portion as the small width portion of the lower end portion of the rod may have a diameter equal to or larger than the diameter of the rod body on the upper side.

  Further, the shape of the tip surface 18a is not necessarily limited to a spherical surface. For example, the tip surface may be a conical surface. Further, the tip surface may be formed in a slope shape or a curved surface shape that gradually approaches the large diameter portion side from the center of the tip surface in the specific direction toward both outer sides.

  Further, the arm portion 31 is not necessarily in the state in which the first and second shaft portions 30a and 30b are removed from the first and second mounting holes 23a and 23b, and the axial center of the first shaft portion 30a and the second shaft portion 30b. It is not necessary to have a shape that coincides with the axis of each other. That is, the arm portion 31 can generate the spring force in a state where the first shaft portion 30a is inserted into the first mounting hole 23a and the second shaft portion 30b is inserted into the second mounting hole 23b. For example, the shaft center of the first shaft portion 30a and the shaft center of the second shaft portion 30b are displaced from each other with the first and second shaft portions 30a, 30b removed from the first and second mounting holes 23a, 23b. It may be a different shape.

2 Jack-up device 6 Jack cylinder 8 Float 10 Holding lever 10a First holding lever 10b Second holding lever 16 Small diameter portion (small width portion)
17 Large diameter part (large part)
18a Front end surface 19 Engaging surface 23a First mounting hole 23b Second mounting hole 23c Third mounting hole 23d Fourth mounting hole 27, 37 Lever portion 28, 38 Engaging portion 28a, 38a Roller portion 30a First shaft portion (shaft Part)
30b Second shaft portion (shaft portion)
31 arm part 31a first arm part 31b second arm part 32 support part 40a third shaft part (shaft part)
40b Fourth shaft portion (shaft portion)
41 arm part 41a third arm part 41b fourth arm part 42 support part 100 work machine

Claims (4)

A jack-up device provided in the work machine to jack up the work machine,
A float to be grounded when jacking up the work machine;
A jack cylinder that is detachable from the float and jacks up the work machine with the float as a base by extending vertically in a state where the float is attached to a lower end;
A pair of holding levers provided at one of the upper end of the float and the lower end of the jack cylinder;
The other portion of the upper end portion of the float and the lower end portion of the jack cylinder with respect to the one portion is a small width portion having a predetermined width in a specific direction that is a horizontal direction, and the one portion of the small width portion. A large portion having a width in the specific direction that is larger than the predetermined width of the small width portion, and the specific portion from an edge on the large portion side of both side surfaces of the small width portion in the specific direction. An engagement surface that is connected to an edge of the narrow portion of both side surfaces of the large portion in the direction and faces the one portion side and the opposite side;
The pair of holding levers have a lever portion provided at the one part so as to be rotatable around a horizontal axis, and an engagement provided at the lever portion so as to be rotatable together with the lever portion. Each of the engaging levers of the pair of holding levers is disposed so as to sandwich the small width portion from both sides in the specific direction and engages with the engaging surface to the other portion. Between the engaging portions of the pair of holding levers, and a rotation position where the pair of holding levers are separated from each other than the restraining position. Can be rotated between a retracted position, which is a rotating position where an interval through which the large portion can pass is formed,
The lever portion extends from the shaft portion to the outside in the radial direction of rotation of the lever portion and is connected to the engagement portion, and the holding lever is retracted. A jack-up device for a working machine, comprising: an arm portion that generates an elastic deformation so as to generate a spring force that causes the holding lever to move toward the restraining position when the lever is disposed at a position. The pair of holding levers protrude from the one part to the other part side, and are pivot positions closer to each other than the restraining position, and the elastic deformation of the arm portion is restored. Can be rotated to the neutral position, which is
The other part has a tip surface located on the one part side of the large portion and facing the one part side,
When the front end surface is pressed against the engaging portion of the pair of holding levers at the neutral position from the side opposite to the one portion, the engaging portion of the pair of holding levers The jack-up device for a work machine according to claim 1, wherein the jack up device has a shape that is moved along a plane so as to be separated to both outer sides of the tip surface in the specific direction and led to both outer sides of the large portion in the specific direction.   The engaging portion is a roller portion supported by the arm portion such that the axial direction is parallel to the horizontal axis and is rotatable about the axis when the tip surface is pressed. Rolls on the tip surface to the outside of the tip surface, and the other part is moved closer to the one part side to roll on the side surface of the large-diameter portion and engage with the engagement surface. The work machine jack-up device according to claim 2, wherein the device is a roller portion. The one part includes a first attachment hole and a second attachment hole that are separately provided on the outer surface of the one part so as to face opposite sides in the extending direction of the horizontal axis, and the vertical direction and the horizontal direction. The first mounting hole and the second mounting hole are spaced apart from each other in a predetermined direction orthogonal to the direction in which the shaft extends, and the sides opposite to each other in the direction in which the horizontal axis extends in the outer surface of the one part. Having a third mounting hole and a fourth mounting hole that are separately provided at facing positions;
The second mounting hole is arranged eccentrically toward the outside of the one part with respect to the first mounting hole in the predetermined direction,
The fourth mounting hole is arranged eccentrically toward the outside of the one part with respect to the third mounting hole in the predetermined direction,
The lever portion of the first holding lever, which is one of the pair of holding levers, is inserted into the first shaft portion and the second mounting hole that are inserted into the first mounting hole. Having two shaft portions as the shaft portion,
The arm portion of the first holding lever extends from the first shaft portion to the outside in the radial direction of rotation of the lever portion of the first holding lever, and directs the first holding lever toward the restraint position. A first arm portion that generates a torsional deformation that generates a first spring force, and extends outward in the radial direction of rotation of the lever portion of the first holding lever from the second shaft portion, and the first holding lever is A second arm portion that causes torsional deformation so as to generate a second spring force that is directed to the opposite side of the restraint position;
The elastic deformation generated in the arm portion when the first holding lever is disposed at the retracted position causes the first arm portion and the second arm portion so that the first spring force is larger than the second spring force. Torsional deformation that occurs in the arm,
The lever portion of the second holding lever, which is the other holding lever of the pair of holding levers, is inserted into the third shaft portion inserted into the third mounting hole and the fourth mounting hole. Having four shaft portions as the shaft portions,
The arm portion of the second holding lever extends from the third shaft portion to the outside in the radial direction of the rotation of the lever portion of the second holding lever, and directs the second holding lever toward the restraint position. A third arm portion that generates a torsional deformation that generates a third spring force, and extends outward from the fourth shaft portion in the radial direction of rotation of the lever portion of the second holding lever. A fourth arm portion that causes torsional deformation so as to generate a fourth spring force that is directed to the opposite side of the restraining position;
The elastic deformation generated in the arm portion when the second holding lever is disposed at the retracted position causes the third arm portion and the fourth arm so that the third spring force is larger than the fourth spring force. The jackup device for a work machine according to any one of claims 1 to 3, wherein the device is a torsional deformation generated in the arm portion.

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