Rod device and working machine

Abstract

The lever assembly (70) includes: a movable bracket (72) and a lever (73), which are supported on a support shaft (77) of a base (71) in a lowered position (P1) and a raised position (P2); a first engaging portion (86) provided on the movable bracket (72); a second engaging portion (88) provided on the lever (73); a cam body (81) mounted on the support shaft (77) in a manner that prevents rotation but allows movement in the axial direction; and a force-applying member (92) for applying force to the cam body (73). 81) Apply force in the direction of engaging with the first engaging part (86) and the second engaging part (88). The first engaging part (86) restricts the rotation of the movable bracket (72) by engaging with the cam body (81) in the lowered position (P1) and the raised position (P2). The second engaging part (88) releases the engagement between the first engaging part (86) and the cam body (81) by rotating the rod (73) upward from the lowered position (P1) or downward from the raised position (P2).

Description

Technical Field

[0001] This invention relates to a pole device and a working machine. Background Technology

[0002] Previously, a rod device disclosed in Patent Document 1 was known.

[0003] The rod device disclosed in Patent Document 1 is configured such that a movable bracket is supported by a first support shaft on a fixed base so as to be able to rotate between a lowered position and a raised position after rotating upward from the lowered position, and a rod is supported by a second support shaft on the movable bracket so as to be able to rotate. By raising or lowering the rod, the movable bracket can change its position between the raised position and the lowered position.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Publication No. 2019-116753 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] The lever device disclosed in Patent Document 1 requires two support shafts because the rotation centers of the lever and the movable bracket are different. Furthermore, a mechanism is needed between the first and second support shafts to restrict the position of the movable bracket to a lowered and raised position, and to release this position restriction by rotating the lever to allow the movable bracket to rotate. Therefore, this design suffers from a large size. Additionally, its high weight necessitates a large operating force.

[0009] The present invention addresses the aforementioned problems and aims to achieve miniaturization and weight reduction of the lever device.

[0010] means for solving problems

[0011] One aspect of the present invention relates to a lever device comprising: a base; a support shaft disposed on the base; a movable bracket and a lever supported by the support shaft to be rotatable between a lowered position and a raised position after rotation upward from the lowered position; at least one first engaging portion disposed on the movable bracket; at least one second engaging portion disposed on the lever; a cam body engaging with the first engaging portion and the second engaging portion, and mounted on the support shaft in a manner that prevents rotation about an axis but allows movement in the axial direction; and a force-applying member that applies force to the cam body in a direction engaging with the first engaging portion and the second engaging portion, wherein in the lowered position and the raised position, the first engaging portion restricts rotation of the movable bracket by engaging with the cam body, and the second engaging portion moves the cam body against the force-applying member by causing the lever to rotate upward from the lowered position or downward from the raised position, thereby releasing the engagement between the first engaging portion and the cam body.

[0012] Additionally, the cam body has a plurality of engagement slots into which the first engagement portion and the second engagement portion respectively engage in the lowered position and the raised position. A rotation limiting surface is formed in the engagement slot into which the first engagement portion engages, and the rotation limiting surface restricts the rotation of the movable bracket by abutting against the first engagement portion. A cam surface is formed in the engagement slot into which the second engagement portion engages, allowing the second engagement portion to slide, so that the cam body moves against the force-applying member when the second engagement portion rotates integrally with the rod.

[0013] In addition, the plurality of engagement slots include a first engagement slot for the first engagement portion to be engaged in the lowered position, a second engagement slot for the second engagement portion to be engaged in the lowered position, and a third engagement slot in which neither the first engagement portion nor the second engagement portion is engaged. In the raised position, the first engagement portion is engaged in the second engagement slot, and the second engagement portion is engaged in the third engagement slot.

[0014] In addition, the first engaging part and the second engaging part are provided in pairs. The pair of first engaging parts are arranged at a point-symmetric position with the center of the support shaft as the symmetric point, and the pair of second engaging parts are arranged at a point-symmetric position with the center of the support shaft as the symmetric point.

[0015] Furthermore, during the period when the engagement between the first engaging part and the cam body is released, the rod rotates relative to the movable bracket, and after the engagement between the first engaging part and the cam body is released, it rotates integrally with the movable bracket.

[0016] Additionally, the rod assembly includes: a guide groove formed on one of the movable bracket and the rod; and a pin disposed on the other of the movable bracket and the rod and inserted into the guide groove, the guide groove being formed in an arc shape centered on the axis of the support shaft, during which the rod rotates relative to the movable bracket while the pin moves between one end and the other end of the guide groove, and when the pin is located at one end or the other end of the guide groove, the movable bracket rotates integrally with the rod.

[0017] In addition, one aspect of the present invention relates to a work machine having the aforementioned lever device.

[0018] In addition, the lever is an operation locking lever that switches the actuator of the work machine to an operable state or an inoperable state.

[0019] Invention Effects

[0020] According to the above structure, the movable bracket and the rod are rotatably supported on the support shaft. A first engaging part is provided on the movable bracket, and a second engaging part is provided on the rod. A cam body that engages or disengages with these first and second engaging parts is installed on the support shaft, thereby constituting a mechanism that restricts the position of the movable bracket to a lowered position and a raised position, and releases the position restriction by rotating the rod to allow the movable bracket to rotate. Therefore, it is possible to achieve miniaturization and weight reduction of the rod device. Attached Figure Description

[0021] Figure 1 This is a side view of the machine.

[0022] Figure 2 It is a 3D view of the area around the driver's seat.

[0023] Figure 3A This is a three-dimensional view of the rod device from the front side.

[0024] Figure 3B This is a three-dimensional view of the rod device from the rear side.

[0025] Figure 3C This is a three-dimensional exploded view of the lever assembly.

[0026] Figure 4A This is a side view of the lever assembly in the lowered position.

[0027] Figure 4B This is a side view showing the movement of the pin from the lowered position to the raised position.

[0028] Figure 5A This is a side view of the lever assembly in the raised position.

[0029] Figure 5BThis is a side view showing the movement of the pin from the raised position to the lowered position.

[0030] Figure 6 This is a left perspective view of the rear of the structure showing the relationship between the base and the movable bracket.

[0031] Figure 7 This is a right-hand perspective view of the rear of the structure, showing the relationship between the base and the movable bracket.

[0032] Figure 8 This is a left-side perspective view showing the relationship between the movable bracket and the rod.

[0033] Figure 9 This is a right-side perspective view showing the relationship between the movable bracket and the rod.

[0034] Figure 10 This is a sectional view of the back of the cam body.

[0035] Figure 11 This is a side view of the cam body, the first engaging part, and the second engaging part at the descending position.

[0036] Figure 12 yes Figure 11 Z1-Z1 view.

[0037] Figure 13 yes Figure 11 Z2-Z2 view.

[0038] Figure 14 This is a side view of the cam body, the first engaging part, and the second engaging part at the lifted position.

[0039] Figure 15 yes Figure 14 Z3-Z3 view.

[0040] Figure 16 yes Figure 14 Z4-Z4 view. Detailed Implementation

[0041] Hereinafter, an embodiment of the present invention will be described with appropriate reference to the accompanying drawings.

[0042] Figure 1 This is a schematic side view showing the overall structure of the work machine 1 according to this embodiment. In this embodiment, a backhoe excavator is exemplified as a rotary work machine as the work machine 1.

[0043] like Figure 1 As shown, the work machine 1 has a body (rotary table) 2, a traveling device 3, and a working device 4. A driver's seat 6 for the operator (driver) is mounted on the body 2.

[0044] In this embodiment, the direction will be towards the front of the operator seat 6 of the machine 1. Figure 1 Arrow A1 direction) is the front (front of the machine), and will be directed towards the operator's rear ( Figure 1 (The direction of arrow A2) is used as the rear (rear of the machine), and... Figure 1 Arrow K1 is used to indicate the forward / backward direction (forward / backward direction of the aircraft). Additionally, the direction towards the operator's left ( Figure 1 (near the front side) as the left, will be oriented towards the operator's right side ( Figure 1 The inside side) will be explained as the right side.

[0045] Furthermore, the horizontal direction, which is orthogonal to the front-back direction K1, will be described as the width direction of the fuselage. The direction from the center of the fuselage 2 towards the right or left side in the width direction will be described as the outer side of the fuselage width direction. In other words, the outer side of the fuselage width direction is the direction away from the center of the fuselage 2's width direction. Conversely, the inner side of the fuselage width direction is the direction closer to the center of the fuselage 2's width direction.

[0046] like Figure 1 As shown, the traveling device 3 is a tracked traveling device that supports the machine body 2 in a drivable manner. It has a traveling frame 3A, a first traveling device 3L located on the left side of the traveling frame 3A, and a second traveling device 3R located on the right side of the traveling frame 3A. The first traveling device 3L and the second traveling device 3R are driven by a traveling motor M1, which is composed of a hydraulic motor (hydraulic actuator). In this embodiment, a tracked traveling device 3 is used, but it is not limited to this; a wheeled or other type of traveling device may also be used. A bulldozer blade device 7 is mounted at the front of the traveling device 3. The bulldozer blade device 7 can be driven by a bulldozer blade cylinder composed of a hydraulic cylinder (hydraulic actuator).

[0047] like Figure 1 As shown, the machine body 2 is supported by the travel device 3 via a rotary bearing 8 in a manner that allows it to rotate around a pivot axis X1 extending in the vertical direction. Furthermore, the machine body 2 has a support bracket 9 for supporting the working device 4 and a swing bracket 10 at its front. The support bracket 9 is provided protruding forward from the machine body 2. The swing bracket 10 is mounted at the front of the support bracket 9 in a manner that allows it to swing around a longitudinal axis (the pivot axis extending in the vertical direction).

[0048] like Figure 1As shown, the working device 4 includes a boom 11, a stick 12, and a bucket 13. The base of the boom 11 is pivotally mounted to the upper part of the swing bracket 10 so as to be able to rotate about a horizontal axis (an axis extending along the width direction of the machine body). The stick 12 is pivotally mounted to the top end of the boom 11 so as to be able to rotate about a horizontal axis. The bucket 13 is provided on the top end of the stick 12 so as to be able to perform digging and unloading operations. The digging operation refers to the operation of swinging the bucket 13 toward the boom 11, for example, the operation of digging soil or sand. The unloading operation refers to the operation of swinging the bucket 13 away from the boom 11, for example, the operation of dropping (discharging) the excavated soil or sand.

[0049] The work machine 1 can replace the bucket 13 or, based on the bucket 13, install other work tools (hydraulic accessories) that can be driven by a hydraulic actuator. Examples of other work tools include hydraulic crushers, hydraulic shredders, angle sweepers, augers, pallet forks, sweepers, lawn mowers, snow blowers, etc.

[0050] The swing bracket 10 can swing via the extension and retraction of a swing cylinder (not shown). The boom 11 can swing via the extension and retraction of the boom cylinder C2. The stick 12 can swing via the extension and retraction of the stick cylinder C3. The bucket 13 can perform digging and dumping actions via the extension and retraction of the bucket cylinder C4. The swing cylinder, boom cylinder C2, stick cylinder C3, and bucket cylinder C4 are all hydraulic cylinders (hydraulic actuators).

[0051] like Figure 1 As shown, a prime mover E1 is mounted at the rear of the machine body 2. The prime mover E1 is a diesel engine. Alternatively, the prime mover E1 can be a gasoline engine, an electric motor, or a hybrid type with both an engine and an electric motor. A driver's unit 18 is mounted in front of the prime mover E1 of the machine body 2. The driver's unit 18 includes a driver's seat 6, a travel lever 16 located in front of the driver's seat 6, a control device (left control device) 17L located on the left side of the driver's seat 6, and a control device (right control device) 17R located on the right side. The travel lever 16 is the operating member for operating the travel device 3. The control devices 17L and 17R are, for example, devices for operating the boom 11, the stick 12, the digging and unloading actions of the bucket 13, and the rotation of the machine body 2. A foot pedal 21 forming the bottom surface is provided on the upper surface of the machine body 2 and in front of the driver's seat 6.

[0052] like Figure 2 , Figure 3A As shown, the left control device 17L, located to the left of the driver's seat 6, includes a console cover 66, a control lever (left control lever) 67L, a remote control valve 68, a handrail 69L, and a lever device 70.

[0053] The control panel cover 66 has a first cover 66A and a second cover 66B. The left control lever 67L is positioned in front of and above the left control device 17L, and is capable of tilting forward, backward, left, and right. The remote control valve 68, a pilot valve operated by the left control lever 67L, is positioned below the left control lever 67L. The remote control valve 68 is housed within the first cover 66A. The armrest 69L, a component for placing the operator's elbow, is positioned behind the left control lever 67L.

[0054] like Figure 3A , Figure 3B As shown, the rod device 70 includes a base 71, a movable bracket 72, and a rod 73.

[0055] like Figure 2 As shown, the base 71 and the movable bracket 72 are covered by the control panel cover 66. The first cover 66A covers the movable bracket 72 and rotates together with it. The rod 73 protrudes forward from the control panel cover 66.

[0056] like Figure 2 As shown, the right control device 17R, located to the right of the driver's seat 6, includes a control panel 74, a control lever (right control lever) 67R, a remote control valve (not shown), a handrail 69R, a bulldozer blade 75, and a plurality of switches 76.

[0057] The control panel cover 74 is a cover that covers the frame of the right control device 17R. The frame of the right control device 17R is mounted on the side of the machine body 2. The right control stick 67R is located at the front and top of the right control device 17R and can be tilted forward, backward, left, and right. The remote control valve is a pilot valve operated by the right control stick 67R, located below the right control stick 67R, and covered by the control panel cover 74. The armrest 69R is a component for placing the operator's elbow, etc., and is located behind the right control stick 67R. The bulldozer blade lever 75 is a lever for operating the bulldozer blade device 7. A plurality of switches 76 are arranged on the upper surface of the control panel cover 74 and are switches for operating various equipment equipped on the work machine 1.

[0058] The left control stick 67L (remote control valve 68) can operate two operating objects (hydraulic actuators) equipped on the work machine 1. For example, the left control stick 67L can operate the rotary motor that rotates the machine body 2 (enabling rotation operation of the machine body 2), and can operate the stick cylinder C3 (enabling swing operation of the stick 12).

[0059] The right control lever 67R can also operate two operating objects (hydraulic actuators) equipped on the work machine 1. For example, the right control lever 67R can operate the boom cylinder C2 (which can swing the boom 11) and the bucket cylinder C4 (which can swing the bucket 13).

[0060] Next, the lever device 70 of this embodiment will be briefly described.

[0061] The lever 73 is an unloading lever (operation locking lever) that switches the hydraulic actuator of the work machine 1 to an operable or inoperable state, and the lever device 70 is an unloading lever device (operation locking lever device) having this unloading lever. Therefore, the following description will use lever device 70 as an unloading lever device and lever 73 as an unloading lever as an example, but lever device 70 is not limited to an unloading lever device, and lever 73 is not limited to an unloading lever. For example, lever 73 may also be an operation locking lever that replaces the hydraulic actuator described above, or switches the electric actuator (not shown) of the work machine 1 to an operable or inoperable state in addition to the hydraulic actuator described above. In addition, lever 73 may also be an operation locking lever that outputs a signal to a control device that controls the operation of the actuator of the work machine 1 to switch the actuator to an operable or inoperable state. In addition, lever 73 is not limited to the purpose of locking the operation of the actuator, and may be used for other purposes.

[0062] like Figure 4A As shown, base 71 is mounted on component 90, which is mounted and fixed to body 2. Unloading lever 73 and movable bracket 72 are supported by support shaft 77 mounted on base 71, allowing them to rotate about the axis. Support shaft 77 is mounted on base 71 in a non-rotatable manner. Left control lever 67L, remote control valve 68, and handrail 69L are mounted on movable bracket 72.

[0063] The unloading lever 73 and the movable bracket 72 are able to Figure 4A The shown lowering position P1 and the position after rotating upwards from the lowering position P1 around the support axis 77 are shown. Figure 5A The position can be changed between the raised position P2 shown. In the raised position P2, for example, the working device 4 (boom cylinder C2, stick cylinder C3, bucket cylinder C4) and the machine body 2 (rotary motor) cannot be operated. When the position is changed to the lowered position P1, the working device 4 can be operated and the machine body 2 can be rotated.

[0064] Furthermore, in the raised position P2, all or most of the hydraulic actuators of the work machine 1 (boom cylinder C2, stick cylinder C3, bucket cylinder C4, swing cylinder, bulldozer blade cylinder, travel motor M1, rotary motor, and hydraulic actuators detachably connected to the maintenance port, etc.) cannot be operated, that is, no working oil is required.

[0065] In the following description, the unloading lever 73 and the movable bracket 72 will be rotated upwards from the lowered position P1. Figure 4AThe direction indicated by the middle arrow D1 is called the lifting direction D1, which is the direction in which the unloading rod 73 and the movable bracket 72 are rotated downwards from the lifted position P2. Figure 5B The direction indicated by the middle arrow D2 is called the descent direction D2.

[0066] Next, the unloading rod device 70 will be described in detail.

[0067] like Figure 3A , Figure 3B , Figure 3C As shown, in addition to the base 71, movable bracket 72, unloading rod 73 and support shaft 77 mentioned above, the unloading rod device 70 also includes a position limiting component 78, a force applying body 79, a detection switch 80 and a cam body 81.

[0068] like Figure 6 , Figure 7 As shown, the base 71 is formed of sheet metal and has a first side wall 71L as the left side wall, a second side wall 71R as the right side wall, and a connecting plate 71A connecting the first side wall 71L and the second side wall 71R on the lower side. The connecting plate 71A is mounted on a member 90 fixed to the body 2. A support shaft 77 is provided transversely through the first side wall 71L and the second side wall 71R. The support shaft 77 is supported by the first side wall 71L and the second side wall 71R, and is mounted on the first side wall 71L and fixed to the base 71. A first pivot support portion 71B is provided on the upper part of the first side wall 71L. A mounting bracket 71C is fixed on the inner surface side of the second side wall 71R (the side opposite to the first side wall 71L), and a position limiting member 78 is mounted on the mounting bracket 71C. An arc-shaped insertion groove 71D centered on the axis of the support shaft 77 is formed on the lower side of the second sidewall 71R.

[0069] like Figure 4A As shown, in the lowered position P1, the movable bracket 72 is supported on the side of the base 71 in a manner that protrudes forward from the upper part of the base 71. A valve mounting part 82 for mounting the remote control valve 68 and a mounting bracket 83 for mounting the handrail 69L are provided at the front of the movable bracket 72.

[0070] like Figure 6 , Figure 7As shown, the movable bracket 72 is formed of sheet metal and has a first wall portion 72L as the left wall portion, a second wall portion 72R as the right wall portion, and a pair of connecting support plates 72A and 72B connecting the first wall portion 72L and the second wall portion 72R. The rear portion of the first wall portion 72L is disposed inside the upper part of the first side wall 71L, and the rear portion of the second wall portion 72R is disposed inside the second side wall 71R. A support shaft 77 is inserted through the first wall portion 72L and the second wall portion 72R. The first wall portion 72L is supported by the support shaft 77 via a boss portion 72C that passes through the first wall portion 72L and is fixed to the first wall portion 72L by welding or the like, so that it can rotate about an axis. A bearing member 84 is installed on the outer side of the second wall portion 72R (on the opposite side to the first wall portion 72L). The second wall portion 72R is supported by the support shaft 77 via the bearing member 84, so that it can rotate about an axis. The head of one of the two bolts mounting the bearing component 84, bolt 84A, is inserted into the through slot 71D and can move within the through slot 71D as the movable bracket 72 moves about the support shaft 77.

[0071] like Figure 7 As shown, a pair of connecting support plates 72A and 72B are arranged on the rear side of the movable bracket 72, separated by a support shaft 77, and span the first wall portion 72L and the second wall portion 72R. Each connecting support plate 72A and 72B is provided with a first engaging portion 86. That is, in this embodiment, a pair of first engaging portions 86 are provided. Alternatively, there may be only one first engaging portion 86. In other words, at least one first engaging portion 86 is sufficient. Figure 11 As shown, a pair of first engaging portions 86 are positioned at a point-symmetric location with respect to the center (axis X2) of the support shaft 77. Each first engaging portion 86 includes: a shaft portion 86A, fixed to connecting support plates 72A and 72B; and a roller 86B, which is rotatably fitted around the shaft portion 86A. The shaft portion 86A is fixed to the connecting support plates 72A and 72B in a manner that protrudes from the connecting support plates 72A and 72B toward the support shaft 77. The roller 86B is cylindrical and fitted between the connecting support plates 72A and 72B and the support shaft 77 and the shaft portion 86A.

[0072] like Figure 6 , Figure 7 As shown, an arc-shaped guide groove 72D centered on the axis of the support shaft 77 is formed at the rear and upper part of the first wall portion 72L. An abutment member 72E is fixed to the rear part of the second wall portion 72R. When the movable bracket 72 rotates to the raised position P2, the abutment member 72E abuts against the position limiting member 78 provided on the base 71, limiting the rotation of the movable bracket 72 in the raised direction D1. Figure 6 As shown, a second pivot support portion 72F is provided at the front of the first wall portion 72L.

[0073] like Figure 8 , Figure 9 As shown, the unloading rod 73 has a rod body 73A, a rod base 73B, an abutment plate 73C, and a pin 73D. The base 73a of the rod body 73A is inserted into a notch 73b formed in the rod base 73B and fixed to the rod base 73B by welding or the like. The abutment plate 73C is fixed to the lower surface of the base 73a of the rod body 73A. The rod base 73B is disposed inside the first wall portion 72L of the movable bracket 72. The rod base 73B is supported by a support shaft 77 via a boss portion 73E that passes through the rod base 73B and is fixed to the rod base 73B by welding or the like, so that it can rotate about an axis (see reference). Figure 10 ).

[0074] like Figure 9 As shown, a pair of support plates 87A and 87B are fixed to the base 73B on the surface opposite to the first wall portion 72L. The pair of support plates 87A and 87B are arranged with a support shaft 77 between them. A second engaging portion 88 is provided on each support plate 87A and 87B. That is, in this embodiment, a pair of second engaging portions 88 are provided. Alternatively, there may be only one second engaging portion 88. In other words, at least one second engaging portion 88 is sufficient. Figure 11 As shown, a pair of second engaging portions 88 are arranged at a point-symmetric position with respect to the center (axis) of the support shaft 77. Each second engaging portion 88 has: a shaft portion 88A, fixed to support plates 87A and 87B; and a roller 88B, fitted onto the outside of the shaft portion 88A in a manner that allows free rotation about the axis of the shaft portion 88A. The shaft portion 88A is fixed to the support plates 87A and 87B in a manner that protrudes from the support plates 87A and 87B toward the support shaft 77. The roller 88B is formed in a cylindrical shape and fitted between the support plates 87A and 87B and the support shaft 77. A pair of first engaging portions 86 (rollers 86B) and a pair of second engaging portions 88 (rollers 88B) are arranged on the same circumference centered on the axis X2 of the support shaft 77 (see reference). Figure 11 ).

[0075] like Figure 4B , Figure 8 As shown, pin 73D is inserted through guide groove 72D formed in the first wall portion 72L. Pin 73D can move between one end 72Da and the other end 72Db of guide groove 72D as unloading rod 73 rotates around support shaft 77.

[0076] Alternatively, pin 73D can be provided on the first wall portion 72L, and guide groove 72D can be formed on the unloading rod 73 side.

[0077] like Figure 4A , Figure 6As shown, the force-applying body 79 is composed of a gas spring. One end of the force-applying body 79 is pivotally supported on a first pivot support 71B, and the other end is pivotally supported on a second pivot support 72F. Therefore, the force-applying body 79 applies a force to the movable bracket 72 in the lifting direction D1.

[0078] The detection switch 80 is a sensor that detects whether the unloading lever 73 (and the movable bracket 72) is in the lowered position P1 or in the upward rotation from the lowered position P1. For example... Figure 3A As shown, the detection switch 80 is positioned at the front of the base 71 near the first sidewall 71L and is mounted on the base 71. In the lowered position P1, the contact of the detection switch 80 is pressed by the abutment plate 73C provided on the unloading rod 73, detecting that the unloading rod 73 is in the lowered position P1. Furthermore, when the unloading rod 73 is rotated from the lowered position P1 in the lifting direction D1, releasing the pressure of the abutment plate 73C on the contact, it is detected that the unloading rod 73 is in a state of rotating upwards from the lowered position P1.

[0079] like Figure 10 As shown, the cam body 81 is mounted on the support shaft 77 between the rod base 73B and the second wall portion 72R in a manner that prevents it from rotating about its axis but allows it to move in the axial direction. Specifically, a through hole 81B for the support shaft 77 to pass through is formed on the center wall 81A on the center side of the cam body 81, and this through hole 81B extends in the axial direction (body width direction). An insertion groove 81C is formed on the inner circumferential surface of the through hole 81B along the axial direction of the cam body 81. A key 89, which engages with the keyway 77A formed on the support shaft 77, is inserted into the insertion groove 81C. Thus, the cam body 81 cannot rotate about its axis relative to the support shaft 77 but can move in the axial direction. Furthermore, the fact that the cam body 81 cannot rotate about its axis relative to the support shaft 77 but can move in the axial direction is not limited to a key engagement. For example, the cam body 81 can be configured such that a sliding plate protrudes from the end face (right end face) 81D of the second wall portion 72R side along the support shaft 77, and the sliding plate also protrudes from the second wall portion 72R along the support shaft 77, so that the surfaces of these sliding plates slidably abut against each other. Thus, the cam body 81 cannot rotate about the axis of rotation relative to the support shaft 77 but can move in the axial direction. Alternatively, the cam body 81 can be configured such that by spline-connecting the support shaft 77 and the center wall 81A of the cam body 81, the cam body 81 cannot rotate about the axis of rotation relative to the support shaft 77 but can move in the axial direction.

[0080] The cam body 81 is composed of an end-face cam formed by forming a groove on the outer peripheral side of the end face of the cylinder. A plurality of grooves (engaging grooves 91) are formed in the cam body 81, and the plurality of engaging grooves 91 are formed on the left side (side) of the outer peripheral wall 81E of the cam body 81 facing the rod base 73B. A first engaging portion 86 and a second engaging portion 88 are engaged (engaged) in the plurality of engaging grooves 91.

[0081] Figure 11 This indicates that the side of the cam body 81 engages with the first engaging part 86 and the second engaging part 88 in the descending position P1. Figure 12 This indicates that the side of the cam body 81 engages with the first engaging part 86 and the second engaging part 88 when P2 is in the raised position. For example... Figure 11 , Figure 12 As shown, a first engaging portion 86 (roller) and a second engaging portion 88 (roller) are embedded in a plurality of engaging grooves 91. That is, the cam body 81 has a plurality of engaging grooves 91 in which the first engaging portion 86 and the second engaging portion 88 are embedded in the lowering position P1 and the lifting position P2, respectively.

[0082] like Figure 11 As shown, the plurality of engagement slots 91 include a first engagement slot 91A, a second engagement slot 91B, and a third engagement slot 91C. The first engagement slot 91A, the second engagement slot 91B, and the third engagement slot 91C each correspond to a pair of first engagement portions 86 and a pair of second engagement portions 88, forming a pair. Therefore, when there is only one first engagement portion 86 and one second engagement portion 88, one first engagement slot 91A, one second engagement slot 91B, and one third engagement slot 91C are each formed.

[0083] like Figure 11 As shown, in the descending position P1, the first engaging portion 86 (roller 86B) is engaged in the first engaging groove 91A, and the second engaging portion 88 (roller 88B) is engaged in the second engaging groove 91B. In the third engaging groove 91C, neither the first engaging portion 86 (roller 86B) nor the second engaging portion 88 (roller 88B) is engaged. Additionally, as... Figure 14As shown, in the raised position P2, neither the first engaging portion 86 (roller 86B) nor the second engaging portion 88 (roller 88B) is engaged in the first engaging groove 91A. The first engaging portion 86 (roller 86B) is engaged in the second engaging groove 91B, and the second engaging portion 88 (roller 88B) is engaged in the third engaging groove 91C. Therefore, the second engaging groove 91B serves as both an engaging groove for the first engaging portion 86 and an engaging groove for the second engaging portion 88. By sharing a portion of the engaging grooves, the cam body 81 (unloading rod device 70) can be miniaturized and simplified. Furthermore, it is not limited to this; in the raised position P2, the engaging groove for the first engaging portion 86 can also be formed separately from the second engaging groove 91B. In other words, two engaging grooves can be formed for one first engaging portion 86, and two engaging grooves can be formed for one second engaging portion 88. In other words, in this embodiment, three engagement slots are formed for a first engagement portion 86 and a second engagement portion 88, but four engagement slots may also be formed for a first engagement portion 86 and a second engagement portion 88.

[0084] like Figure 10 As shown, a force-applying member 92 is provided between the cam body 81 and the second wall portion 72R, applying force to the cam body 81 in a direction that engages with the first engaging portion 86 and the second engaging portion 88. Specifically, the force-applying member 92 is composed of a helical spring and is arranged around the outer periphery of the support shaft 77. In this embodiment, the force-applying member 92 (helical spring) is arranged in a compressed state between the end face 81D of the cam body 81 and the bearing member 84, with one end abutting against the end face 81D of the cam body 81 and the other end abutting against the bearing member 84. Furthermore, the other end of the force-applying member 92 may also abut against the second wall portion 72R.

[0085] like Figure 12As shown, in the lowered position P1, the engaging surface (first engaging surface 91A) of the first engaging groove 91A, which engages (abuts) with the end 86a of the first engaging portion 86 in the lifting direction D1, becomes a rotation limiting surface 93. This rotation limiting surface 93 prevents the movable bracket 72 from rotating even if it is forcibly rotated in the lifting direction D1 (prevents the first engaging portion 86 from disengaging from the first engaging groove 91A). In other words, the rotation limiting surface 93 is a surface that restricts the rotation of the movable bracket 72. In other words, the first engaging portion 86, in the lowered position P1, restricts the rotation of the movable bracket 72 in the lifting direction D1 by engaging with the cam body 81 (first engaging groove 91A). The rotation limiting surface 93 is a surface orthogonal to the circumference of the cam body 81, or an inclined surface that moves toward the opening side of the groove as it moves toward the lifting direction D1, and is inclined at an angle that can prevent the rotation of the movable bracket 72 (first engaging portion 86). Furthermore, the engagement surface (second engagement surface 91b) of the first engagement groove 91A opposite to the first engagement surface 91A (the opposite side of the circumferential direction of the cam body 81) also becomes the rotation restriction surface 93.

[0086] like Figure 13 As shown, in the lowered position P1, the engagement surface (third engagement surface 91c) of the second engagement groove 91B, which engages (abuts) with the end 88a of the second engagement portion 88 in the lifting direction D1, is a cam surface 94. This cam surface 94 allows the cam body 81 to move against the force applied by the force member 92 by sliding through the second engagement portion 88 when the unloading rod 73 is rotated in the lifting direction D1. The cam surface 94 is an inclined surface that moves towards the opening side of the groove as it moves towards the lifting direction D1. It is an inclined surface with a gentle inclination angle that allows the cam body 81 to move against the force applied by the force member 92 by pressing the second engagement portion 88 when the unloading rod 73 is rotated. In this embodiment, the inclination angle of the cam surface 94 is not limited, for example, it is set to approximately 45°. The engagement surface (fourth engagement surface 91d) of the second engagement groove 91B opposite to the third engagement surface 91c (opposite to the circumferential direction of the cam body 81) is a rotation limiting surface 93.

[0087] That is, in the engagement groove 91 into which the first engagement part 86 is inserted, a rotation limiting surface 93 is formed to restrict the rotation of the movable bracket 72 by abutting against the first engagement part 86. In the engagement groove 91 into which the second engagement part 88 is inserted, a cam surface 94 is formed for the second engagement part 88 to slide, so that when the second engagement part 88 rotates integrally with the unloading rod 73, the cam body 81 moves against the force-applying member 92.

[0088] In the unloading rod device 70 of this embodiment, when the movable bracket 72 and the unloading rod 73 are in the lowered position P1, as follows: Figure 12As shown, the first engaging portion 86 engages with the second engaging surface 91b (rotation limiting surface 93), thereby limiting the downward rotation of the movable bracket 72, as... Figure 13 As shown, the downward rotation of the unloading rod 73 is restricted by engaging the second engaging part 88 with the fourth engaging surface 91d (rotation restriction surface 93). This restricts the downward rotation of the movable bracket 72 and the unloading rod 73 from the lowered position P1.

[0089] When the unloading lever 73 is moved from Figure 4A When the lowering position P1 is rotated in the lifting direction D1, as shown... Figure 13 As shown, the second engaging portion 88 slides in the lifting direction D1 on the third engaging surface 91c (cam surface 94) of the second engaging groove 91B, causing the cam body 81 to move in the direction of arrow Y1 (see reference). Figure 13 (The double-dotted line). On the other hand, such as Figure 12 As shown, in the lowered position P1, the first engaging part 86 engages (abuts) with the rotation limiting surface 93 (first engaging surface 91A) of the first engaging groove 91A, and the movable bracket 72 does not rotate. Therefore, when the unloading rod 73 rotates upward from the lowered position P1, it rotates relative to the movable bracket 72. Specifically, when the unloading rod 73 is in the lowered position P1, as... Figure 4B As shown in the left-hand diagram, pin 73D is located at one end 72Da of guide groove 72D. As unloading rod 73 rotates upward from the lowered position P1, as... Figure 4B As shown in the diagram on the right, pin 73D moves to the other end 72Db of guide groove 72D. As a result, unloading rod 73 rotates relative to movable bracket 72.

[0090] When the second engaging part 88 disengages from the second engaging groove 91B and rests on the left end face of the cam body 81, as Figure 12 As shown by the double-dotted line, the first engaging groove 91A disengages from the first engaging portion 86, and the engagement between the first engaging portion 86 and the first engaging groove 91A is released. When the engagement between the first engaging portion 86 and the first engaging groove 91A is released, the movable bracket 72 can rotate in the lifting direction D1. Furthermore, in the state where the engagement between the first engaging portion 86 and the first engaging groove 91A is released, the pin 73D is located at the other end 72Db of the guide groove 72D.

[0091] That is, during the period when the unloading rod 73 is disengaged from the first engaging part 86 and the cam body 81 (first engaging groove 91A), it rotates relative to the movable bracket 72. After the first engaging part 86 and the cam body 81 are disengaged, it rotates together with the movable bracket 72.

[0092] When the unloading rod 73 is rotated from the lowering position P1 to the lifting direction D1, causing the movable bracket 72 to rotate to the lifting position P2, the movable bracket 72 can also be rotated by the unloading rod 73. However, in this embodiment, when the movable bracket 72 rotates from the lowering position P1 to the lifting position P2, the movable bracket 72 rotates to the lifting direction D1 by the force of the gas spring 79.

[0093] When the unloading lever 73 and the movable bracket 72 rotate to the raised position P2, as Figure 14 As shown, the first engaging portion 86 is embedded in the second engaging groove 91B, and the second engaging portion 88 is embedded in the third engaging groove 91C. Furthermore, in the raised position P2, the movable bracket 72 is restricted from rotating in the raising direction D1 by abutting the position limiting member 78 via the abutting member 72E. Since the pin 73D is located at the other end 72Db of the guide groove 72D, the rotation of the unloading rod 73 in the raising direction D1 is also restricted.

[0094] like Figure 15 As shown, in the raised position P2, the first engaging part 86 engages (abuts) with the fourth engaging surface 91d (rotation limiting surface 93), so even if the movable bracket 72 is to be rotated in the downward direction D2, the movable bracket 72 will not rotate.

[0095] like Figure 16 As shown, the engagement surface (fifth engagement surface 91e) of the third engagement groove 91C, which engages (abuts) with the end 88b of the second engagement portion 88 in the descending direction D2, is formed on the cam surface 94. The cam surface 94 of the third engagement groove 91C is an inclined surface that moves towards the opening side of the groove as it moves toward the descending direction D2. It is an inclined surface with a gentle inclination angle that allows the cam body 81 to move against the force applied by the force member 92 by pressing the second engagement portion 88 by forcibly rotating the unloading rod 73. The engagement surface (sixth engagement surface 91f) of the third engagement groove 91C on the opposite side (opposite side of the circumferential direction of the cam body 81) to the fifth engagement surface 91e is a rotation limiting surface 93.

[0096] When the unloading lever 73 is rotated from the raised position P2 to the lowering direction D2, as follows: Figure 16 As shown, the second engaging portion 88 slides downward in the direction D2 on the fifth engaging surface 91e (cam surface 94) of the third engaging groove 91C, causing the cam body 81 to move in the direction of arrow Y1 (see reference). Figure 16 (The double-dotted line).

[0097] On the other hand, such as Figure 15As shown, in the raised position P2, the first engaging part 86 engages (abuts) with the fourth engaging surface 91d (rotation limiting surface 93) of the second engaging groove 91B, and the movable bracket 72 does not rotate. Therefore, when the unloading rod 73 rotates downward from the raised position P2, it rotates relative to the movable bracket 72. Specifically, when the unloading rod 73 is in the raised position P2, as... Figure 5B As shown in the left-hand diagram, pin 73D is located at the other end 72Db of guide groove 72D. As unloading rod 73 rotates downward from the raised position P2, pin 73D moves to one end 72Da of guide groove 72D (see reference). Figure 5B (See the diagram on the right). As a result, the unloading rod 73 rotates relative to the movable bracket 72.

[0098] When the second engaging part 88 disengages from the third engaging groove 91C and rests on the left end face of the cam body 81, as Figure 15 As shown by the double-dotted line, the second engaging groove 91B disengages from the first engaging part 86, and the engagement between the first engaging part 86 and the second engaging groove 91B is released. When the engagement between the first engaging part 86 and the second engaging groove 91B is released, the movable bracket 72 can rotate in the downward direction D2. That is, during the period when the engagement between the first engaging part 86 and the cam body 81 (second engaging groove 91B) is released, the unloading rod 73 rotates relative to the movable bracket 72, and after the engagement between the first engaging part 86 and the cam body 81 is released, it rotates integrally with the movable bracket 72.

[0099] When the unloading lever 73 rotates from the lowered position P1 to the lifting direction D1, causing the movable bracket 72 to rotate to the lifted position P2, the movable bracket 72 rotates in the lifting direction D1 due to the force of the gas spring 79. However, when the unloading lever 73 rotates from the lifted position P2 to the lowered direction, causing the movable bracket 72 to rotate to the lowered position P1, the movable bracket 72 rotates due to the unloading lever 73. That is, the force that causes the unloading lever 73 to rotate downward is transmitted to the movable bracket 72 via the pin 73D, overcoming the force of the gas spring 79 and pressing the movable bracket 72 downward.

[0100] In this embodiment, the movable bracket 72 and the unloading rod 73 are supported by a support shaft 77 to allow rotation. A cam body 81, which engages or disengages with the first engaging portion 86 of the movable bracket 72 and the second engaging portion 88 of the unloading rod 73, is mounted on the support shaft 77. This constitutes a mechanism that restricts the position of the movable bracket 72 to a lowered position P1 and a raised position P2, and releases the position restriction by rotating the unloading rod 73, thus allowing the movable bracket 72 to rotate. Therefore, the unloading rod device (rod device) 70 can be miniaturized and lightweight. Consequently, the force of the gas spring 79 is also small, thereby reducing the operating force of the unloading rod 73.

[0101] The lever device (unloading lever device) 70 of this embodiment includes: a base 71; a support shaft 77 disposed on the base 71; a movable bracket 72 and a lever 73 supported by the support shaft 77, which are rotatable between a lowered position P1 and a raised position P2 after rotating upward from the lowered position P1; at least one first engaging portion 86 disposed on the movable bracket 72; at least one second engaging portion 88 disposed on the lever 73; and a cam body 81 that engages with the first engaging portion 86 and the second engaging portion 88, and is non-rotatable around the axis but rotatable around the axis. The cam body 81 is mounted on the support shaft 77 in a directional moving manner; and the force-applying member 92 applies force to the cam body 81 in a direction that engages with the first engaging part 86 and the second engaging part 88. The first engaging part 86, in the lowered position P1 and the raised position P2, restricts the rotation of the movable bracket 72 by engaging with the cam body 81. The second engaging part 88 causes the rod 73 to rotate upward from the lowered position P1 or downward from the raised position P2, so that the cam body 81 moves against the force-applying member 92, thereby releasing the engagement between the first engaging part 86 and the cam body 81.

[0102] Thus, the movable bracket 72 and the rod 73 are rotatably supported on the support shaft 77. A first engaging part 86 is provided on the movable bracket 72, and a second engaging part 88 is provided on the rod 73. The cam body 81, which engages or disengages with these first engaging parts 86 and second engaging parts 88, is mounted on the support shaft 77. This constitutes a mechanism that restricts the position of the movable bracket 72 to the lowered position P1 and the raised position P2, and releases the position restriction by rotating the rod 73 to allow the movable bracket 72 to rotate. Therefore, the rod device 70 can be miniaturized and made lighter.

[0103] In addition, the cam body 81 has a plurality of engagement slots 91 into which the first engagement portion 86 and the second engagement portion 88 are respectively inserted in the lowered position P1 and the raised position P2. A rotation limiting surface 93 is formed in the engagement slot 91 into which the first engagement portion 86 is inserted. The rotation limiting surface 93 restricts the rotation of the movable bracket 72 by abutting against the first engagement portion 86. A cam surface 94 is formed in the engagement slot 91 into which the second engagement portion 88 is inserted, so that when the second engagement portion 88 rotates integrally with the rod 73, the cam body 81 moves against the force-applying member 92.

[0104] Thus, a mechanism can be simply and compactly constructed that can restrict the position of the movable bracket 72 to the lowered position P1 and the raised position P2, and can release the position restriction by rotating the lever 73 to allow the movable bracket 72 to rotate.

[0105] In addition, the plurality of engagement slots 91 include: in the lowered position P1, a first engagement slot 91A into which the first engagement portion 86 is engaged, a second engagement slot 91B into which the second engagement portion 88 is engaged, and a third engagement slot 91C into which the first engagement portion 86 and the second engagement portion 88 are not engaged; in the raised position P2, the first engagement portion 86 is engaged in the second engagement slot 91B, and the second engagement portion 88 is engaged in the third engagement slot 91C.

[0106] Therefore, by making a portion of the engagement grooves 91 common, the cam body 81 can be miniaturized and simplified.

[0107] In addition, a pair of first engaging parts 86 and a pair of second engaging parts 88 are provided. The pair of first engaging parts 86 are arranged at a point-symmetric position with the center X2 of the support shaft 77 as the symmetric point, and the pair of second engaging parts 88 are arranged at a point-symmetric position with the center of the support shaft 77 as the symmetric point.

[0108] This allows the movable bracket 72 and the rod 73 to rotate stably.

[0109] In addition, during the period when the engagement between the first engaging part 86 and the cam body 81 is released, the lever 73 rotates relative to the movable bracket 72, and after the engagement between the first engaging part 86 and the cam body 81 is released, it rotates together with the movable bracket 72.

[0110] Thus, by continuously rotating the lever 73, the movable bracket 72 can be changed between the lowered position P1 and the raised position P2.

[0111] Additionally, it includes: a guide groove 72D formed in one of the movable bracket 72 and the rod 73; and a pin 73D disposed in the other of the movable bracket 72 and the rod 73 and inserted into the guide groove 72D. The guide groove 72D is formed in an arc shape centered on the axis of the support shaft 77. During the period when the pin 73D moves between one end 72Da and the other end 72Db of the guide groove 72D, the rod 73 rotates relative to the movable bracket 72. When the pin 73D is located at one end 72Da or the other end 72Db of the guide groove 72D, the movable bracket 72 and the rod 73 rotate together.

[0112] Thus, the following structure can be achieved with a simple structure: during the period when the engagement between the first engaging part 86 and the cam body 81 is released, the rod 73 rotates relative to the movable bracket 72; after the engagement between the first engaging part 86 and the cam body 81 is released, the rod 73 and the movable bracket 72 rotate together.

[0113] Alternatively, the aforementioned lever device 70 can also be installed on the work machine 1.

[0114] Alternatively, lever 73 can also be an operation locking lever (unloading lever 73) that switches the actuator of the work machine 1 to an operable state or an inoperable state.

[0115] The foregoing has described one embodiment of the present invention, but it should be considered that the embodiments disclosed herein are illustrative rather than limiting in all respects. The scope of the present invention is defined not by the foregoing description but by the claims, and includes all modifications within the meaning and scope of the claims.

[0116] Explanation of reference numerals in the attached figures:

[0117] 1 work machine

[0118] 6 driver's seats

[0119] 70-bar device (unloading bar device, operating locking bar device)

[0120] 71 abutment

[0121] 72 movable brackets

[0122] 72D guide slot

[0123] 72Da one end

[0124] 72Db other end

[0125] 73 levers (unloading lever, operation locking lever)

[0126] 73D sales

[0127] 77 shafts

[0128] 81 Cam Body

[0129] 86 First Card Unit

[0130] 88 Second Card Combination

[0131] 91-card slot

[0132] 91A First Card Slot

[0133] 91B Second Card Slot

[0134] 91C Third Card Slot

[0135] 92 Force-applying components

[0136] 93 Rotation Limiting Surface

[0137] 94 Cam Surface

[0138] P1 descending position

[0139] P2 lift position

[0140] X2 Center

Claims

1. A rod device, wherein, have: abutment; A support shaft is disposed on the base. The movable bracket and rod are supported by the pivot so that they can rotate between a lowered position and a raised position after rotating upward from the lowered position. At least one first engaging portion is disposed on the movable bracket; At least one second engaging portion is provided on the rod; The cam body engages with the first engaging part and the second engaging part, and is mounted on the support shaft in a manner that prevents it from rotating about the axis but allows it to move in the axial direction; as well as The force-applying component applies force to the cam body in the direction of engaging with the first engaging portion and the second engaging portion. In the lowered position and the raised position, the first engaging portion restricts the rotation of the movable bracket by engaging with the cam body. The second engaging portion moves the cam body against the force-applying member by rotating the rod upward from the lowered position or downward from the raised position, thereby releasing the engagement between the first engaging portion and the cam body.

2. The lever device according to claim 1, wherein, The cam body has a plurality of engagement slots for the first engagement portion and the second engagement portion to be respectively engaged in the lowered position and the raised position. A rotation limiting surface is formed in the engagement groove into which the first engagement part is inserted. This rotation limiting surface restricts the rotation of the movable bracket by abutting against the first engagement part. A cam surface is formed in the engagement groove into which the second engagement portion is inserted, so that the cam body moves against the force-applying member when the second engagement portion rotates integrally with the rod.

3. The lever device according to claim 2, wherein, The plurality of engaging slots includes a first engaging slot for the first engaging portion to be engaged in at the descended position, a second engaging slot for the second engaging portion to be engaged in, and a third engaging slot in which neither the first engaging portion nor the second engaging portion is engaged. In the raised position, the first engaging portion is engaged in the second engaging groove, and the second engaging portion is engaged in the third engaging groove.

4. The lever device according to any one of claims 1 to 3, wherein, The first engaging portion and the second engaging portion are each provided in a pair. The first engaging portions are positioned at a point symmetrical about the center of the support shaft. A pair of second engaging portions are positioned at a point symmetrical about the center of the support shaft.

5. The lever device according to any one of claims 1 to 3, wherein, During the period when the engagement between the first engaging part and the cam body is released, the rod rotates relative to the movable bracket. After the engagement between the first engaging part and the cam body is released, it rotates integrally with the movable bracket.

6. The lever device according to claim 5, wherein, have: A guide groove is formed in one of the movable bracket and the rod; and A pin, located on the other side of the movable bracket and the rod, is inserted into the guide slot. The guide groove is formed in an arc shape centered on the axis of the support shaft. During the movement of the pin between one end and the other end of the guide groove, the rod rotates relative to the movable bracket, and when the pin is located at one end or the other end of the guide groove, the movable bracket rotates integrally with the rod.

7. A working machine having a lever device according to any one of claims 1 to 6.

8. The work machine according to claim 7, wherein, The lever is an operation locking lever that switches the actuator of the work machine to an operable state or an inoperable state.

Images