Rotating mechanism and boarding and alighting blocking device equipped with the same

Abstract

To provide a rotation mechanism capable of softening the impact applied to a first rotation member and a second rotation member while preventing the attitude of the first rotation member and the second rotation member from unintentionally changing.SOLUTION: In a rotation mechanism 21, a base material 22 is provided with a first regulating portion 37a against which at least one of a first rotating member 29 and a second rotating member 32 is directly or indirectly pressed when the first rotating member 29 and the second rotating member 32 are in the first posture, and a second regulating portion 38a against which at least one of the first rotating member 29 and the second rotating member 32 is directly or indirectly pressed when the first rotating member 29 and the second rotating member 32 are in the second posture. At least one of the first regulating portion 37a and the second regulating portion 38a is configured to be elastically deformed along a pressing direction in which at least one of the first rotating member 29 and the second rotating member 32 is directly or indirectly pressed by the urging force of an urging member 28.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a rotation mechanism in which a first rotating member and a second rotating member rotate in conjunction with each other with respect to a base material, and an on-off device for boarding and alighting provided with the same.

Background Art

[0002] Hereinafter, the background art will be described. In the following description, the signs in parentheses, etc. are the signs in the prior art documents. Patent Document 1 (Japanese Patent Application Laid-Open No. 2015-68009) describes a rotation mechanism used for switching the hydraulic system of a hydraulic actuator provided in a working machine between an operating state and a non-operating state. This rotation mechanism includes a substrate (3), a first rotating member (4) pivotally supported so as to be rotatable about a first rotation axis (41) with respect to the substrate (3), and a second rotating member (5) pivotally supported so as to be rotatable about a second rotation axis (52) with respect to the substrate (3). This rotation mechanism is provided around the passage leading to the seat of the working machine, a grip (42) is attached to the first rotating member (4), and a blocking bar (51) is attached to the second rotating member (5). When the first rotating member (4) and the second rotating member (5) rotate to be in the first posture, the blocking bar is located at a blocking position where it protrudes into the passage and blocks the passage. When the first rotating member (4) and the second rotating member (5) rotate to be in the second posture, the blocking bar (51) is located at a retracted position where it retracts from the passage and does not block the passage. That is, the operator can operate the grip (42) to move the blocking bar (51) to the blocking position, and can also operate the grip (42) to move the blocking bar (51) to the retracted position.

[0003] When the first rotating member (4) and the second rotating member (5) rotate to the first position, the limit switch (9) is provided on the substrate (3) to switch the hydraulic system of the hydraulic actuator provided in the working machine to the operating state. When the first rotating member (4) and the second rotating member (5) rotate to the second position, the limit switch (9) is used to switch the hydraulic system of the hydraulic actuator to the non-operating state. That is, when the operator sits on the seat and moves the blocking rod (51) to the blocking position, the hydraulic system of the hydraulic actuator is in the operating state. In this state, since the blocking rod (51) has moved to the blocking position, the operator is not allowed to pass through the passage to the seat, that is, to leave the seat. On the contrary, when the operator finishes operating the working machine and moves the blocking rod (51) to the retracted position, the hydraulic system of the hydraulic actuator is in the non-operating state. In this state, since the blocking rod has moved to the retracted position, the operator is allowed to pass through the passage to the seat, that is, to leave the seat.

[0004] In this way, by installing the rotating mechanism as described above on the working machine, while the hydraulic system of the hydraulic actuator is in the operating state, the operator is prevented from leaving the seat, and while the operator is allowed to leave the seat, the hydraulic system of the hydraulic actuator can be made to be in the non-operating state.

[0005] In such a rotating mechanism, it is necessary to maintain the states of the first position and the second position as described above unless operated by the operator. For this purpose, a biasing member has been conventionally provided to prevent the first rotating member and the second rotating member from rotating freely. For example, in the rotating mechanism described in Patent Document 1, a tension coil spring as the biasing member (6) is used to try to maintain the states of the first position and the second position as described above. Further, in Patent Document 2 (Japanese Patent Laid-Open No. 9-25650), the elastic action of a spring (33) as a biasing member is utilized so that the first rotating member (the first lever 26) and the second rotating member (the second lever 30) do not rotate freely.

Prior Art Documents

Patent Documents

[0006] Patent Document 1 Japanese Patent Application Laid-Open No. 2015-68009 Patent Document 2 Japanese Patent Application Laid-Open No. 9-25650 Summary of the Invention Problems to be Solved by the Invention

[0007] It is assumed that strong vibrations are applied to the working machine where the rotation mechanism is installed. Therefore, it is preferable to increase the biasing force applied by the above-described biasing member so that the first rotating member and the second rotating member do not rotate freely due to such vibrations. That is, the biasing force applied to the first rotating member and the second rotating member when reaching the first posture is increased and that state is reliably maintained, and the biasing force applied to the first rotating member and the second rotating member when reaching the second posture is increased and that state is reliably maintained.

[0008] However, when the biasing force by the biasing member is increased, the impact applied to the first rotating member and the second rotating member when the first rotating member and the second rotating member rotate and stop in the first posture, and when the first rotating member and the second rotating member rotate and stop in the second posture becomes large. Considering that such impacts act repeatedly, it is required to increase the strength of each member more than necessary in order to avoid breakage of the first rotating member and the second rotating member and ensure durability. In particular, when the first rotating member and the second rotating member are not flat and have portions where stress such as bending and torsion can concentrate, it is required to increase the strength of such portions more than necessary.

[0009] The present invention has been made in view of the above problems, and an object thereof is to provide a rotation mechanism capable of reducing the impact applied to the first rotating member and the second rotating member while preventing the first rotating member and the second rotating member from changing their postures unintentionally, and a boarding and alighting blocking device including the same. Means for Solving the Problems

[0010] The characteristic configuration of the rotation mechanism according to the present invention for achieving the above object includes a base material, a first rotation member pivotally supported so as to be rotatable about a first rotation axis with respect to the base material, a second rotation member pivotally supported so as to be rotatable about a second rotation axis with respect to the base material, and a biasing member. The first rotation member has a fitting shaft provided at a position away from the first rotation axis. The second rotation member has a clearance fit hole into which the fitting shaft is fitted. As the fitting shaft moves within the clearance fit hole, the first rotation member and the second rotation member rotate in conjunction with each other with respect to the base material, so that the first rotation member and the second rotation member change their postures between a first posture and a second posture. This is a rotation mechanism, the biasing member is configured to bias the first rotation member and the second rotation member toward the sides facing the first posture and the second posture respectively from an intermediate posture between the first posture and the second posture, the base material is provided with a first restricting portion against which at least one of the first rotation member and the second rotation member is directly or indirectly pressed by the biasing force of the biasing member when the first rotation member and the second rotation member are in the first posture, and a second restricting portion against which at least one of the first rotation member and the second rotation member is directly or indirectly pressed by the biasing force of the biasing member when the first rotation member and the second rotation member are in the second posture, at least one of the first restricting portion and the second restricting portion is configured to be elastically deformable along the pressing direction, which is the direction in which at least one of the first rotation member and the second rotation member is directly or indirectly pressed by the biasing force of the biasing member.

[0011] According to the above characteristic configuration, if the first restricting portion is configured to be elastically deformable along the pressing direction, when the first rotating member and the second rotating member rotate to the first posture, at least one of the first rotating member and the second rotating member is directly or indirectly pressed against the first restricting portion by the biasing member while elastically deforming the first restricting portion along the pressing direction. Thereby, the rotation of the first rotating member and the second rotating member is restricted. Further, when the first rotating member and the second rotating member rotate and stop in the first posture, the impact applied to the first rotating member and the second rotating member by the biasing member is alleviated by the elastic deformation of the first restricting portion. Therefore, durability can be ensured without increasing the strength of the first rotating member and the second rotating member more than necessary. In addition, since the impact applied to the first rotating member and the second rotating member is alleviated by the first restricting portion, the biasing force by the biasing member can be increased in order to prevent the first rotating member and the second rotating member from rotating freely from the first posture due to vibration or the like.

[0012] Similarly, if the second restricting portion is configured to be elastically deformable along the pressing direction, when the first rotating member and the second rotating member rotate to the second posture, at least one of the first rotating member and the second rotating member is directly or indirectly pressed against the second restricting portion by the biasing member while elastically deforming the second restricting portion along the pressing direction. Thereby, the rotation of the first rotating member and the second rotating member is restricted. Further, when the first rotating member and the second rotating member rotate and stop in the second posture, the impact applied to the first rotating member and the second rotating member by the biasing member is alleviated by the elastic deformation of the second restricting portion. Therefore, durability can be ensured without increasing the strength of the first rotating member and the second rotating member more than necessary. In addition, since the impact applied to the first rotating member and the second rotating member is alleviated by the second restricting portion, the biasing force by the biasing member can be increased in order to prevent the first rotating member and the second rotating member from rotating freely from the second posture due to vibration or the like.

[0013] Another characteristic configuration of the rotation mechanism according to the present invention is that at least one of the first restricting portion and the second restricting portion is disposed at a position where at least one of the first rotating member and the second rotating member is directly or indirectly pressed against, and is formed in a plate shape that is elastically deformable along the pressing direction.

[0014] According to the above characteristic configuration, if the first restricting portion is formed in a plate shape that is elastically deformable along the pressing direction, when the first rotating member and the second rotating member rotate to the first posture, at least one of the first rotating member and the second rotating member directly or indirectly hits the plate-shaped first restricting portion. That is, the first restricting portion can reliably receive at least one of the first rotating member and the second rotating member directly or indirectly over a wide area and can mitigate the impact.

[0015] Similarly, if the second restricting portion is formed in a plate shape that is elastically deformable along the pressing direction, when the first rotating member and the second rotating member rotate to the second posture, at least one of the first rotating member and the second rotating member directly or indirectly hits the plate-shaped second restricting portion. That is, the second restricting portion can reliably receive at least one of the first rotating member and the second rotating member directly or indirectly over a wide area and can mitigate the impact.

[0016] Still another characteristic configuration of the rotation mechanism according to the present invention includes a leaf spring member formed using a single plate-shaped member, the leaf spring member including a fixing portion fixed to the main body portion of the base material, a first extending portion extending from the fixing portion in a first direction and having a free end at the tip, and a second extending portion extending from the fixing portion in a second direction opposite to the first direction and having a free end at the tip, the first restricting portion being provided on the first extending portion and the second restricting portion being provided on the second extending portion.

[0017] According to the above characteristic configuration, since the tip of the first extension portion provided in the leaf spring member is a free end, the first restricting portion provided in the first extension portion can change its position in an elastically deformable state. And when the first rotating member and the second rotating member rotate to the first posture, at least one of the first rotating member and the second rotating member directly or indirectly contacts the plate surface of the leaf spring member constituting the first restricting portion. That is, the first restricting portion can reliably receive at least one of the first rotating member and the second rotating member directly or indirectly over a wide area and can mitigate the impact.

[0018] Similarly, since the tip of the second extension portion provided in the leaf spring member is a free end, the second restricting portion provided in the second extension portion can change its position in an elastically deformable state. And when the first rotating member and the second rotating member rotate to the second posture, at least one of the first rotating member and the second rotating member directly or indirectly contacts the plate surface of the leaf spring member constituting the second restricting portion. That is, the second restricting portion can reliably receive at least one of the first rotating member and the second rotating member directly or indirectly over a wide area and can mitigate the impact.

[0019] In addition, according to the above characteristic configuration, by using a single leaf spring member and simply fixing the leaf spring member to the main body portion of the base material, the elastically deformable first restricting portion and second restricting portion can be provided.

[0020] The characteristic configuration of the boarding and alighting blocking device according to the present invention is a boarding and alighting blocking device provided around a passage leading to a seat of a work machine, the above rotation mechanism, a blocking rod provided on one of the first rotating member and the second rotating member, an operation portion provided on the other of the first rotating member and the second rotating member and operated by an operator of the work machine, when the first rotating member and the second rotating member are in the first posture, the blocking rod is disposed at a blocking position where it protrudes into the passage and blocks the passage, When the first rotating member and the second rotating member are in the second posture, the blocking rod is arranged at a retracted position retracted from the passage.

[0021] According to the above characteristic configuration, when the operator moves the operation part and the first rotating member and the second rotating member rotate to be in the first posture, the blocking rod projects into the passage leading to the seat of the work machine and blocks the passage. That is, the blocking rod prevents the operator sitting on the seat from leaving the seat. Further, when the operator moves the operation part and the first rotating member and the second rotating member rotate to be in the second posture, the blocking rod is located at a retracted position retracted from the passage and does not block the passage. That is, the operator is allowed to leave the seat. Furthermore, by using the above rotation mechanism, each of the state where the blocking rod is in the blocking position and the state where it is in the retracted position is reliably maintained.

[0022] Another characteristic configuration of the boarding and alighting blocking device according to the present invention includes a detection device attached to the base material for detecting whether the first rotating member and the second rotating member are in the first posture. Only when the detection device detects that it is in the first posture, the hydraulic system of the hydraulic actuator provided in the work machine is in an operating state.

[0023] According to the above-described characteristic configuration, the hydraulic system of the hydraulic actuator provided in the working machine becomes operative only when the detection device detects that the first rotating member and the second rotating member are in the first posture, that is, only when the blocking rod is in the blocking position. As a result, the working machine becomes operable. On the other hand, when the detection device does not detect that the first rotating member and the second rotating member are in the first posture, for example, when the blocking rod is not in the blocking position and the operator is away from the seat, the hydraulic system of the hydraulic actuator provided in the working machine does not become operative. As a result, the working machine becomes inoperable. That is, while the hydraulic system of the hydraulic actuator is in an operative state, it is possible to prevent the operator from leaving the seat, and while it is allowed for the operator to leave the seat, it is possible to prevent the hydraulic system of the hydraulic actuator from becoming operative. Further, as described above, since it is possible to prevent the first rotating member and the second rotating member from rotating freely from the first posture due to vibration or the like by increasing the biasing force by the biasing member, even with such a configuration of the detection device, it is possible to avoid the hydraulic system of the hydraulic actuator accidentally becoming inoperative during use of the working machine.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0025] The rotation mechanism 21 and the boarding and alighting blocking device 20 according to the embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a state where the boarding and alighting blocking device 20 is provided on the seat 7 of the working machine 1. A seat 7 on which an operator sits when operating the working machine 1 is provided on the floor 6 of the cab 2 of the working machine 1 such as a hydraulic excavator. The operator can enter and exit the cab 2 through the passage 8 of the entrance / exit 4. The working machine 1 is provided with a plurality of hydraulic actuators 13 and a control lever 9 for operating these hydraulic actuators 13. By operating the control lever 9 by the operator, the working machine 1 can be controlled. The hydraulic system 11 that supplies pressure oil to the hydraulic actuator 13 is provided with a hydraulic lock mechanism 12 that can stop the supply of pressure oil to the hydraulic actuator 13.

[0026] The boarding and alighting blocking device 20 is provided around the passage 8 leading to the seat 7 of the working machine 1. In the example shown in FIG. 1, the boarding and alighting blocking device 20 is provided on the side portion of the seat 7 in a state covered with the cover 10. Note that the blocking rod 15 and the operation lever 16 provided on the boarding and alighting blocking device 20 protrude outside the cover 10. As will be described later, the operator can operate the operation lever 16 as an operation unit to switch between a state where the blocking rod 15 is arranged at a blocking position where the passage 8 is blocked and a state where the blocking rod 15 is retracted from the passage 8 to a retracted position.

[0027] FIGS. 2 and 3 are views showing the configuration of the rotation mechanism 21 provided in the boarding and alighting blocking device 20. Specifically, FIG. 2 shows a state where the rotation mechanism 21 is in a first posture, and FIG. 3 shows a state where the rotation mechanism 21 is in a second posture. FIG. 4 is an exploded perspective view of the rotation mechanism 21. The boarding and alighting blocking device 20 includes a rotation mechanism 21, a blocking rod 15, and an operation lever 16. The rotation mechanism 21 includes a base material 22, a first rotation member 29 pivotally supported so as to be rotatable about a first rotation axis 25 with respect to the base material 22, a second rotation member 32 pivotally supported so as to be rotatable about a second rotation axis 26 with respect to the base material 22, and a biasing member 28.

[0028] The blocking rod 15 is provided on one of the first rotating member 29 and the second rotating member 32, and the operation lever 16 is provided on the other of the first rotating member 29 and the second rotating member 32, and is operated by the operator of the working machine 1. In the present embodiment, an example in which the blocking rod 15 is provided on the second rotating member 32 and the operation lever 16 is provided on the first rotating member 29 is shown.

[0029] As shown in FIGS. 1 and 2, when the first rotating member 29 and the second rotating member 32 rotate to the first posture by the operator moving the operation lever 16, the blocking rod 15 projects into the passage 8 leading to the seat 7 of the working machine 1 and is located at a blocking position for blocking the passage 8. In that case, the blocking rod 15 prevents the operator sitting on the seat 7 from leaving the seat 7. Further, as shown in FIGS. 1 and 3, when the first rotating member 29 and the second rotating member 32 rotate to the second posture by the operator moving the operation lever 16, the blocking rod 15 is located at a retracted position retracted from the passage 8. In that case, the operator is allowed to leave the seat 7.

[0030] The base material 22, the first rotating member 29, and the second rotating member 32 are formed using, for example, plate-shaped members made of metal. The first rotating shaft 25 and the second rotating shaft 26 are provided on one surface of the main body portion 22a of the base material 22. A first hole 30 penetrating the first main body portion 29a of the first rotating member 29 is provided, and the first rotating member 29 and the base material 22 are assembled using a push nut 46 and a washer 47 with the first rotating shaft 25 of the base material 22 passed through the first hole 30. As a result, the first rotating member 29 can rotate relative to the base material 22 about the first rotating shaft 25. Similarly, a second hole 45 penetrating the second rotating member 32 is provided, and the second rotating member 32 and the base material 22 are assembled using a push nut 51 and a washer 52 with the second rotating shaft 26 of the base material 22 passed through the second hole 45. As a result, the second rotating member 32 can rotate relative to the base material 22 about the second rotating shaft 26.

[0031] The first rotating member 29 has a fitting shaft 31 provided at a position away from the first rotating shaft 25 and the first hole 30. The fitting shaft 31 protrudes on both sides of the first main body portion 29a of the first rotating member 29, that is, on the side facing the base material 22 and the side opposite thereto. The second rotating member 32 has a loose fitting hole 33. The first rotating member 29 and the second rotating member 32 are assembled using a retaining ring 48 and washers 49, 50 so that the second rotating member 32 does not separate from the first rotating member 29 with the fitting shaft 31 of the first rotating member 29 fitted into the loose fitting hole 33 of the second rotating member 32. Then, the first rotating member 29 and the second rotating member 32 rotate relative to the base material 22 in conjunction with each other while the fitting shaft 31 of the first rotating member 29 relatively moves within the loose fitting hole 33 of the second rotating member 32, so that the first rotating member 29 and the second rotating member 32 change their postures between the first posture shown in FIG. 1 and the second posture shown in FIG. 2.

[0032] Regarding the shape of the first rotating member 29, in the present embodiment, among the plate-shaped members constituting the first rotating member 29, the fitting shaft 31 is provided at the tip of the portion extending in one direction when viewed from the portion where the first hole 30 is provided, and the operation lever 16 is provided at the tip of the portion extending in another direction when viewed from the portion where the first hole 30 is provided. Then, the first rotating member 29 provided with the fitting shaft 31 and the operation lever 16 is rotatable relative to the base material 22 about the first hole 30 through which the first rotating shaft 25 of the base material 22 passes.

[0033] Similarly, regarding the shape of the second rotating member 32, in the present embodiment, among the plate-shaped members constituting the second rotating member 32, the loose fitting hole 33 is provided in one direction when viewed from the portion where the second hole 45 is provided, and the blocking rod 15 is provided in another direction when viewed from the portion where the second hole 45 is provided. Then, the second rotating member 32 provided with the loose fitting hole 33 and the blocking rod 15 is rotatable relative to the base material 22 about the second hole 45 through which the second rotating shaft 26 of the base material 22 passes.

[0034] A detection device 39 for detecting whether the first rotating member 29 and the second rotating member 32 are in the first posture is attached to the main body portion 22a of the base material 22 using screws 43 and 44. The detection device 39 detects whether the first rotating member 29 and the second rotating member 32 are in the first posture based on the position of the first rotating member 29 with respect to the main body portion 22a of the base material 22, and transmits the detection result to the control unit 14 via the wiring 40. The wiring 40 is fixed to the base material 22 using a bundling band 41. Then, the control unit 14 controls the operation of the hydraulic lock mechanism 12, and supplies pressure oil to the hydraulic actuator 13 only when the detection device 39 detects that it is in the first posture, so as to activate the hydraulic system 11 of the hydraulic actuator 13 provided in the working machine 1.

[0035] In this way, the boarding and alighting cutoff device 20 causes the hydraulic system 11 of the hydraulic actuator 13 to be in an operating state only when the cutoff bar 15 is disposed at the cutoff position for cutting off the passage 8. Specifically, the boarding and alighting cutoff device 20 supplies pressure oil to the hydraulic actuator 13 only when the detection device 39 detects that the first rotating member 29 and the second rotating member 32 are in the first posture, that is, only when the cutoff bar 15 is located at the cutoff position for cutting off the passage 8, thereby causing the hydraulic system 11 of the hydraulic actuator 13 provided in the working machine 1 to be in an operating state. On the other hand, when the detection device 39 does not detect that the first rotating member 29 and the second rotating member 32 are in the first posture, for example, when the cutoff bar 15 is not located at the cutoff position and the operator is away from the seat 7, the boarding and alighting cutoff device 20 stops supplying pressure oil to the hydraulic actuator 13, so as not to cause the hydraulic system 11 of the hydraulic actuator 13 provided in the working machine 1 to be in an operating state.

[0036] That is, while the hydraulic system 11 of the hydraulic actuator 13 is in an operating state, the passage 8 is blocked by the cutoff bar 15 so that the operator cannot leave the seat 7, and while the passage 8 is not blocked by the cutoff bar 15 and the operator is allowed to leave the seat 7, the hydraulic system 11 of the hydraulic actuator 13 can be prevented from being in an operating state.

[0037] On one surface of the base material 22 on the same side where the first rotating member 29 and the second rotating member 32 are arranged, a biasing member support portion 27 is provided. And a biasing member 28 that connects the biasing member support portion 27 and the fitting shaft 31 of the first rotating member 29 is provided. The biasing member 28 is configured by using an elastically deformable elongated plate-shaped member. Both ends of the biasing member 28 are bent into a U shape. The biasing member 28 is attached to the base material 22 in a state rotatable about the biasing member support portion 27 in such a form that the U-shaped portion at one end is wound around the biasing member support portion 27. Also, the biasing member 28 is attached to the first rotating member 29 in a state rotatable about the fitting shaft 31 in such a form that the U-shaped portion at the other end is wound around the fitting shaft 31.

[0038] The biasing member 28 biases the first rotating member 29 and the second rotating member 32 toward the sides respectively leading to the first posture and the second posture from the intermediate posture between the first posture and the second posture by its elastic force. For example, when the first rotating member 29 and the second rotating member 32 rotate to a posture close to the first posture, the biasing member 28 biases the first rotating member 29 and the second rotating member 32 to the first posture by its elastic force. Also, when the first rotating member 29 and the second rotating member 32 rotate to a posture close to the second posture, the biasing member 28 biases the first rotating member 29 and the second rotating member 32 to the second posture by its elastic force. That is, even if the operator stops the operation of the operation lever 16 when the first rotating member 29 and the second rotating member 32 are in the intermediate posture between the first posture shown in FIG. 2 and the second posture shown in FIG. 3, due to the biasing force of the biasing member 28, the first rotating member 29 and the second rotating member 32 will be in either the first posture or the second posture. And when the operator operates the operation lever 16 to make the first rotating member 29 and the second rotating member 32 in the first posture or the second posture, thereafter, it is prevented that the first rotating member 29 and the second rotating member 32 rotate freely due to vibration or the like. And since it is possible to prevent the first rotating member 29 and the second rotating member 32 from rotating freely from the first posture, in the configuration of the detection device 39 as described above, it is possible to avoid that the hydraulic system 11 of the hydraulic actuator 13 accidentally becomes in a non-operating state during the use of the working machine 1.

[0039] On one surface of the base material 22 on the same side where the first rotating member 29 and the second rotating member 32 are arranged, a leaf spring support portion 23 is provided. FIG. 5 is a diagram for explaining the shape of a leaf spring member 34 provided in the leaf spring support portion 23. The leaf spring support portion 23 has a shape that rises vertically from the surface of the main body portion 22a of the base material 22. The leaf spring member 34 is formed using a single plate-like member. The leaf spring member 34 includes a fixing portion 35 fixed to the main body portion 22a of the base material 22, a first extending portion 37 extending from the fixing portion 35 in the first direction D1 with its tip being a free end, and a second extending portion 38 extending from the fixing portion 35 in the second direction D2 opposite to the first direction D1 with its tip being a free end. A through hole 36 is provided in the fixing portion 35, and a screw 42 passes through the through hole 36 and is fixed to the screw hole 24 of the leaf spring support portion 23, so that the leaf spring member 34 is fixed to the leaf spring support portion 23 in a state where the surface of the fixing portion 35 of the leaf spring member 34 faces the surface of the leaf spring support portion 23. In the example shown in FIG. 5, the angle formed by the first direction D1 and the second direction D2 is 180°. Note that the first direction D1 and the second direction D2 do not have to be in a 180° relationship as shown in the drawing, and it is sufficient that they face approximately in opposite directions. For example, the angle formed by the first direction D1 and the second direction D2 may be in the range of 120° to 240°.

[0040] The width of the leaf spring member 34 in the direction orthogonal to the first direction D1 and the second direction D2 is not uniform. For example, the width W3 of the first extending portion 37 is the same as the width W1 of the fixing portion 35, but the width W2 of the second extending portion 38 is narrower than W1 and W3.

[0041] A first restricting portion 37a is provided on the first extending portion 37, and a second restricting portion 38a is provided on the second extending portion 38. Since the tip of the first extending portion 37 included in the leaf spring member 34 is a free end, the first restricting portion 37a provided on the first extending portion 37 can change its position in an elastically deformable state. Similarly, since the tip of the second extending portion 38 included in the leaf spring member 34 is a free end, the second restricting portion 38a provided on the second extending portion 38 can change its position in an elastically deformable state. In this way, the elastically deformable first restricting portion 37a and second restricting portion 38a are provided on the base material 22.

[0042] The first restricting portion 37a and the second restricting portion 38a are arranged at positions where at least one of the first rotating member 29 and the second rotating member 32 is directly or indirectly pressed against. And, when the first rotating member 29 and the second rotating member 32 are in the first posture, at least one of the first rotating member 29 and the second rotating member 32 is directly or indirectly pressed against the first restricting portion 37a by the biasing force of the biasing member 28. Further, the first restricting portion 37a and the second restricting portion 38a are configured to be elastically deformable along the pressing direction which is the direction in which at least one of the first rotating member 29 and the second rotating member 32 is directly or indirectly pressed against by the biasing force of the biasing member 28. And, when the first rotating member 29 and the second rotating member 32 are in the second posture, at least one of the first rotating member 29 and the second rotating member 32 is directly or indirectly pressed against the second restricting portion 38a by the biasing force of the biasing member 28.

[0043] Since the first restricting portion 37a is formed in a plate shape that is elastically deformable along the pressing direction, when the first rotating member 29 and the second rotating member 32 rotate to be in the first posture, at least one of the first rotating member 29 and the second rotating member 32 directly or indirectly hits the plate surface of the first restricting portion 37a which is a part of the leaf spring member 34. That is, the first restricting portion 37a can surely receive at least one of the first rotating member 29 and the second rotating member 32 directly or indirectly in a wide area and relieve the impact.

[0044] Similarly, since the second restricting portion 38a is formed in a plate shape that is elastically deformable along the pressing direction, when the first rotating member 29 and the second rotating member 32 rotate to be in the second posture, at least one of the first rotating member 29 and the second rotating member 32 directly or indirectly hits the plate surface of the second restricting portion 38a which is a part of the leaf spring member 34. That is, the second restricting portion 38a can surely receive at least one of the first rotating member 29 and the second rotating member 32 directly or indirectly in a wide area and relieve the impact.

[0045] FIG. 6 is an enlarged view of the leaf spring member 34 in a state where the rotation mechanism 21 is in the first posture. The first rotating member 29 and the second rotating member 32 are sequentially positioned in a direction away from the main body portion 22a of the base material 22. Further, in a state where the leaf spring member 34 is attached to the leaf spring support portion 23, the width W3 of the first restricting portion 37a of the leaf spring member 34 extends to the range where the second rotating member 32 is located. As a result, when the rotation mechanism 21 is in the first posture, the second rotating member 32 is directly pressed against the first restricting portion 37a of the leaf spring member 34 having the width W3 by the biasing member 28.

[0046] Since the first restricting portion 37a is configured to be elastically deformable along the pressing direction, when the first rotating member 29 and the second rotating member 32 rotate to the first posture, the end portion of the second rotating member 32 directly hits the first restricting portion 37a while elastically deforming the first restricting portion 37a along the pressing direction by the biasing member 28. Thereby, the rotation of the first rotating member 29 and the second rotating member 32 is restricted. Further, when the first rotating member 29 and the second rotating member 32 rotate and stop in the first posture, the impact applied to the first rotating member 29 and the second rotating member 32 by the biasing member 28 is alleviated by the elastic deformation of the first restricting portion 37a. Therefore, durability can be ensured without increasing the strength of the first rotating member 29 and the second rotating member 32 more than necessary. In addition, since the impact applied to the first rotating member 29 and the second rotating member 32 is alleviated by the first restricting portion 37a, the biasing force by the biasing member 28 can be increased in order to prevent the first rotating member 29 and the second rotating member 32 from rotating freely from the first posture due to vibration or the like. In addition, since the first restricting portion 37a is elastically deformable, the sound when the second rotating member 32 hits the first restricting portion 37a becomes relatively small.

[0047] FIG. 7 is an enlarged view of the leaf spring member 34 in a state where the rotation mechanism 21 is in the second posture. In a direction away from the main body portion 22a of the base material 22, the biasing member 28 wound around the fitting shaft 31 of the first rotating member 29, the first main body portion 29a of the first rotating member 29, and the second rotating member 32 are sequentially positioned. Further, in a state where the leaf spring member 34 is attached to the leaf spring support portion 23, the width W2 of the second restricting portion 38a of the leaf spring member 34 extends up to the range where the biasing member 28 wound around the fitting shaft 31 of the first rotating member 29 is located, but does not extend up to the ranges where the first main body portion 29a of the first rotating member 29 and the second rotating member 32 are located. As a result, when the rotation mechanism 21 is in the second posture, the biasing member 28 wound around the fitting shaft 31 of the first rotating member 29 is pressed against the second restricting portion 38a having the width W2. That is, the first rotating member 29 is indirectly pressed against the second restricting portion 38a having the width W2 by the biasing member 28 (i.e., with the biasing member 28 interposed therebetween).

[0048] Since the second restricting portion 38a is configured to be elastically deformable along the pressing direction, when the first rotating member 29 and the second rotating member 32 rotate to be in the second posture, the first rotating member 29 indirectly contacts the second restricting portion 38a while elastically deforming the second restricting portion 38a along the pressing direction by the biasing member 28. Thereby, the rotation of the first rotating member 29 and the second rotating member 32 is restricted. Further, when the first rotating member 29 and the second rotating member 32 rotate and stop in the second posture, the impact applied to the first rotating member 29 and the second rotating member 32 by the biasing member 28 is alleviated by the elastic deformation of the second restricting portion 38a. Therefore, durability can be ensured without increasing the strength of the first rotating member 29 and the second rotating member 32 more than necessary. In addition, since the impact applied to the first rotating member 29 and the second rotating member 32 is alleviated by the second restricting portion 38a, the biasing force by the biasing member 28 can be increased in order to prevent the first rotating member 29 and the second rotating member 32 from rotating freely from the second posture due to vibration or the like. In addition, since the second restricting portion 38a is elastically deformable, the sound when the biasing member 28 hits the second restricting portion 38a becomes relatively small.

[0049] <Another Embodiment> <1> In the above embodiment, an example in which the biasing member 28 is formed using an elastically deformable plate-like member has been described. However, the material and shape of the biasing member 28 can be changed as appropriate. For example, the biasing member 28 may be formed using an elastically deformable spring or the like.

[0050] <2> In the above embodiment, an example in which the first restricting portion 37a and the second restricting portion 38a are realized using the leaf spring member 34 has been described. However, the material and shape of the first restricting portion 37a and the second restricting portion 38a can be changed as appropriate. For example, the first restricting portion 37a and the second restricting portion 38a may be formed by fixing an elastically deformable member such as rubber or resin to the leaf spring support portion 23.

[0051] <3> In the above embodiment, an example in which the first restricting portion 37a and the second restricting portion 38a are realized using one leaf spring member 34 has been described. However, each of the first restricting portion 37a and the second restricting portion 38a may be formed using a different member. Also, the position where each of the first restricting portion 37a and the second restricting portion 38a is provided on the base material 22 can be changed as appropriate. Also in this case, when the first rotating member 29 and the second rotating member 32 are in the first posture, at least one of the first rotating member 29 and the second rotating member 32 is directly or indirectly pressed against the first restricting portion 37a by the biasing force of the biasing member 28. When the first rotating member 29 and the second rotating member 32 are in the second posture, at least one of the first rotating member 29 and the second rotating member 32 is directly or indirectly pressed against the second restricting portion 38a by the biasing force of the biasing member 28.

[0052] <4> In the above-described embodiment, a case has been described in which both the first restricting portion 37a and the second restricting portion 38a are configured to be elastically deformable along the pressing direction in which at least one of the first rotating member 29 and the second rotating member 32 is directly or indirectly pressed by the biasing force of the biasing member 28. However, it is sufficient that at least one of the first restricting portion 37a and the second restricting portion 38a is configured to be elastically deformable in this way.

[0053] <5> In the above-described embodiment, a case has been described in which the hydraulic system 11 of the hydraulic actuator 13 provided in the working machine 1 is in an operating state only when the detection device 39 detects that the first rotating member 29 and the second rotating member 32 are in the first posture. However, it is not necessary to interlock the information indicating what posture the first rotating member 29 and the second rotating member 32 are in with whether the hydraulic system 11 of the hydraulic actuator 13 is in an operating state or a non-operating state.

[0054] <6> In the above-described embodiment, an example has been described in which the width W2 of the second restricting portion 38a provided on the second extending portion 38 of the leaf spring member 34 is formed to be narrow so that the second restricting portion 38a does not contact the first main body portion 29a of the first rotating member 29 and the second rotating member 32. However, the shapes of the first restricting portion 37a and the second restricting portion 38a can be changed as appropriate. That is, their shapes may be set according to which member the first restricting portion 37a and the second restricting portion 38a are applied to.

[0055] <7> In the above-described embodiment, the operation lever 16 may be formed integrally with the first rotating member 29, or may be attached to the first rotating member 29 after being formed separately from the first rotating member 29. In the above-described embodiment, the cutoff rod 15 may be formed integrally with the second rotating member 32, or may be attached to the second rotating member 32 after being formed separately from the second rotating member 32.

[0056] <8> Furthermore, the configurations disclosed in the above embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in other embodiments as long as there is no contradiction. Also, the embodiments disclosed in this specification are illustrative, and the embodiments of the present invention are not limited thereto, and can be appropriately modified within the scope not departing from the object of the present invention.

Industrial Applicability

[0057] The present invention can be used in a rotation mechanism that can reduce the impact applied to the first rotating member and the second rotating member while preventing the first rotating member and the second rotating member from changing their postures unintentionally, and in an entrance / exit blocking device equipped with the same.

Explanation of Reference Numerals

[0058] 1: Working machine 7: Seat 8: Passage 11: Hydraulic system 13: Hydraulic actuator 15: Shut-off bar 16: Operating lever (operating portion) 20: Entrance / exit blocking device 21: Rotation mechanism 22: Base material 22a: Main body portion 25: First rotation axis 26: Second rotation axis 28: Biasing member 29: First rotating member 31: Fitting shaft 32: Second rotating member 33: Loose fitting hole 34: Leaf spring member 35: Fixed portion 37: First extending portion 37a: First restricting portion 38: Second extending portion 38a: Second restricting portion 39: Detection device D1: First direction D2: Second direction

Claims

1. a base material, a first rotating member pivotally supported so as to be rotatable about a first rotation axis with respect to the base material, a second rotating member pivotally supported so as to be rotatable about a second rotation axis with respect to the base material, and a biasing member, wherein the first rotating member has a fitting shaft provided at a position away from the first rotation axis, the second rotating member has a clearance fit hole into which the fitting shaft is fitted, the first rotating member and the second rotating member rotate with respect to the base material in conjunction with each other while the fitting shaft moves within the clearance fit hole, so that the first rotating member and the second rotating member change their postures between a first posture and a second posture, which is a rotation mechanism, the biasing member is configured to bias the first rotating member and the second rotating member toward each of the first posture and the second posture from an intermediate posture between the first posture and the second posture, the base material is provided with a first restricting portion against which at least one of the first rotating member and the second rotating member is directly or indirectly pressed by the biasing force of the biasing member when the first rotating member and the second rotating member are in the first posture, and a second restricting portion against which at least one of the first rotating member and the second rotating member is directly or indirectly pressed by the biasing force of the biasing member when the first rotating member and the second rotating member are in the second posture, a rotation mechanism in which at least one of the first restricting portion and the second restricting portion is configured to be elastically deformable along a pressing direction, which is a direction in which at least one of the first rotating member and the second rotating member is directly or indirectly pressed by the biasing force of the biasing member.

2. The rotation mechanism according to claim 1, wherein at least one of the first restricting portion and the second restricting portion is disposed at a position where at least one of the first rotating member and the second rotating member is directly or indirectly pressed, and is formed in a plate shape that is elastically deformable along the pressing direction.

3. comprising a leaf spring member formed using a single plate-shaped member, the leaf spring member includes a fixing portion fixed to the main body portion of the base material, a first extending portion extending from the fixing portion in a first direction and having a free end at the tip, and a second extending portion extending from the fixing portion in a second direction opposite to the first direction and having a free end at the tip. The rotation mechanism according to claim 1 or 2, wherein the first restricting portion is provided on the first extending portion, and the second restricting portion is provided on the second extending portion.

4. A boarding and alighting blocking device provided around a passage leading to a seat of a working machine, The rotation mechanism according to any one of claims 1 to 3, A blocking rod provided on one of the first rotating member and the second rotating member, An operating portion provided on the other of the first rotating member and the second rotating member and operated by an operator of the working machine, When the first rotating member and the second rotating member are in the first posture, the blocking rod is disposed at a blocking position where it protrudes into the passage to block the passage, A boarding and alighting blocking device in which, when the first rotating member and the second rotating member are in the second posture, the blocking rod is disposed at a retracted position retracted from the passage.

5. Comprising a detection device attached to the base material for detecting whether the first rotating member and the second rotating member are in the first posture, The boarding and alighting blocking device according to claim 4, wherein the hydraulic system of a hydraulic actuator provided in the working machine is in an operating state only when the detection device detects that the first posture is present.

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