Travel lever device

Abstract

To provide a travel lever device which dispenses with a lock device or the like for an operation lever, enables the operation of a working machine simultaneously with the release of the lock of the operation lever, simplifies the operation of the working machine, and can reduce operation errors.SOLUTION: A travel lever device (100) for an electric working machine includes a first biasing means (13) for biasing an operation lever (10) upward from below, a stopper portion (14), and a front-rear restricting portion (111) for restricting a front-rear operation of the operation lever (10) from a neutral position, wherein the operation lever (10) is movable between a lock position where the stopper portion (14) interferes with a recess plate (123) or the front-rear restricting portion (111) to restrict the operation of the operation lever (10) and a release position where the operation lever (10) is pushed downward so that the stopper portion (14) passes below the recess plate (123) or the front-rear restricting portion (111) to allow the operation lever (10) to be operated.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a travel lever device used in an electric work machine. [Background technology]

[0002] For example, Patent Document 1 describes a locking structure for an operating lever that is easy to lock and unlock, and can stably maintain the locked state even if an unnecessary external force is applied to the operating lever in the locked state. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2017-001157 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the locking structure of the operating lever described in Patent Document 1, the operating lever is switched between locked and unlocked states by swinging the switching lever, so the operation of the work equipment and the operation to unlock the locked state must be performed separately, making the operation complicated and causing operational errors.

[0005] In view of the above circumstances, an object of the present invention is to provide a travel lever device that does not require a locking device for the operating lever, that allows the working machine to be operated as soon as the operating lever is unlocked, that simplifies the operation of the working machine, and that reduces operational errors. [Means for solving the problem]

[0006] The travel lever device for an electric work machine comprises an operating lever that is manually operated by an operator of the electric work machine to travel the machine, an operating panel that guides the operating lever and has a continuous guide groove, a pair of steering cams located below the operating panel and provided on the left and right sides via the travel lever, and a first biasing means that biases the operating lever upward from below, wherein the operating lever has a stopper portion, and the operating panel has a front-to-rear regulating portion in the center that regulates the forward and rearward operation of the operating lever from the neutral position, and the steering cam has a recessed plate parallel to the operating panel and a cam plate connected perpendicular to the recessed plate, and the operating lever is movable between a locked position where the stopper portion interferes with the recessed plate or the front-to-rear regulating portion to regulate operation of the operating lever, and a released position where the operating lever is pushed downward and the stopper portion passes below the recessed plate or the front-to-rear regulating portion, allowing operation of the operating lever.

[0007] The stopper portion comprises a front stopper portion, a rear stopper portion, a left stopper portion, and a right stopper portion provided on the front, rear, left, and right sides of the operating lever, respectively; the steering cam comprises a left steering cam located on the left side of the travel lever, and a right steering cam located on the right side of the travel lever; the left stopper portion and the right stopper portion are located lower than the front stopper portion and the rear stopper portion; and the left stopper portion and the right stopper portion have slopes on the left steering cam side and the right steering cam side, respectively.

[0008] The present invention also has a front-rear neutral holding mechanism that holds the operating lever in a neutral position when the operating lever is operated in the front-rear direction, and the front-rear neutral holding structure includes a first shaft that allows the operating lever to swing forward and backward, a front-rear swing plate through which the first shaft is inserted, a front-rear holding cam that is fixed below the front-rear swing plate and has a curved recessed portion, a second shaft that can swing forward and backward, a front-rear holding link through which the second shaft is inserted, a first rotating body provided at one end of the front-rear holding link, and a second biasing means provided at the other end of the front-rear holding link, and is characterized in that the first rotating body is in contact with the curved surface of the recessed portion in response to the swing of the front-rear swing plate.

[0009] The present invention also features a left-right neutral holding mechanism that holds the operating lever in a neutral position when the operating lever is operated left or right, and the left-right neutral holding mechanism includes a connection portion fixed to the operating lever, a third shaft portion that communicates with the front-rear swing plate portion and the connection portion and allows the operating lever and the joint portion to swing left and right relative to the front-rear swing plate portion, a swing plate portion hole provided in the front-rear swing plate portion parallel to the third shaft portion, a connection portion hole provided in the connection portion that is continuous with the swing plate portion hole, third biasing means that has one side fixed inside the swing plate portion hole, and a biasing portion that is fixed to the other side of the third biasing means and biases the outer periphery of the entrance of the connection portion hole. [Effects of the Invention]

[0010] According to the lever device of the present invention, the operating lever can be moved between a locked position in which the stopper portion interferes with a recessed plate provided on the steering cam or a front-to-rear regulating portion provided on the operating panel, restricting operation of the operating lever, and a released position in which the operating lever is pushed downward, causing the stopper portion to pass below the recessed plate or the front-to-rear regulating portion, allowing operation of the operating lever.Since the operating lever cannot be operated unless it is pushed in, erroneous operation can be reduced.

[0011] In addition, the left stopper portion and the right stopper portion have slopes on the left steering cam side and the right steering cam side, respectively, so that when the operating lever is released, the first biasing means causes the slopes to slide on the left steering cam side and the right steering cam, allowing the stopper portion to automatically move from the release position to the lock position.

[0012] In addition, the front-to-rear oscillating plate portion through which the first shaft portion that allows the operating lever to swing back and forth is inserted, the front-to-rear holding cam that is fixed to the front-to-rear oscillating plate portion and has a curved recessed portion, and the first rotating body that is provided at one end of the front-to-rear holding link through which the second shaft portion that can swing back and forth is inserted are in contact with the curved surface of the recessed portion in response to the oscillation of the front-to-rear oscillating plate portion, and since the second biasing means provided at the other end of the front-to-rear holding link biases it downward, the operating lever can always be held in a neutral front-to-rear position.

[0013] In addition, a connection part fixed to the operating lever, a third shaft part communicating with the front-rear oscillating plate part and the connection part, and allowing the operating lever and joint part to swing left and right relative to the front-rear oscillating plate part, and a third biasing means fixed inside the connection part hole that is continuous with the oscillating plate part hole, and the third biasing means causes the biasing part to bias the outer periphery of the entrance to the connection part hole, so that the operating lever can always be held in a neutral left-right position. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is an external view of an operating lever using a traveling lever device according to the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] 10A and 10B are diagrams illustrating the positional relationship between a stopper portion and a steering cam. [Figure 5] FIG. 10 is a diagram showing the position of a first biasing means. [Figure 6] FIG. 10 is a side view showing the operating lever in a neutral position. [Figure 7] FIG. 10 is a side view showing the operating lever in a forward tilted position. [Figure 8]FIG. 10 is a side view showing the operating lever in a tilted rearward position. [Figure 9] FIG. [Figure 10] 10A and 10B are diagrams showing positions of holes in the front-rear swing plate portion. [Figure 11] 1A and 1B are diagrams showing the left-right neutral holding structure, in which (a) shows the case where the operating lever is in the neutral position, and (b) shows the case where the operating lever is moved left or right. [Figure 12] 1A is a diagram showing the relationship between the switch and the switch push plate, and FIG. 1B is a diagram showing the positional relationship in a braking state, FIG. 1C is a diagram showing the positional relationship in a forward state, and FIG. 1D is a diagram showing the positional relationship in a reverse state. [Figure 13] 1A is a diagram showing the relationship between the right steering cam and the right holding link, in which (a) is a diagram showing the positional relationship in a neutral state, (b) is a diagram showing the positional relationship during forward right turning, and (c) is a diagram showing the positional relationship during reverse right turning. [Figure 14] FIG. [Figure 15] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] <<About the travel lever device 100>> The travel lever device 100 of the present invention is for operating an electrically operated electric work machine, such as an electric aerial work machine, which moves forward, backward, turns forward right, turns forward left, turns backward left, or turns backward right using crawlers provided with left and right axles.In this specification, the neutral position of the operating lever 10 refers to a position where the electric work machine is stopped and its operation is locked to place it in a non-operating state.

[0016] The traveling lever device 100 mainly has an operating lever 10, an operating panel 11, a steering cam 12, and a first biasing means 13, and is capable of moving between a locked position in which operation of the operating lever 10 is restricted, and a released position in which operation of the operating lever 10 is possible.

[0017] (Regarding the operating lever 10) 1 and 2, the operating lever 10 is a lever that is manually operated by an operator of an electric work machine. The operating lever 10 has a gripper 101, a lever portion 102, and a fixed portion 103.

[0018] The gripper 101 is the part at the upper end that is gripped by the operator. The lever portion 102 has a gentle S-curve shape when viewed from the front, as shown in FIG. 1. The S-curve shape prevents interference with the switch panel of the electric work machine that is located close to the traveling lever device 100. The fixing portion 103 has a generally L-shape when viewed from the side, and is inserted into the operation panel 11. The fixing portion 103 has a first elongated hole 103a and a second elongated hole 103b that are vertically long below the stopper portion 14 to enable the operating lever 10 to be pushed in. The first elongated hole 103a and the second elongated hole 103b have the same shape, and the operating lever 10 can be pushed in by the vertical lengths of the first elongated hole 103a and the second elongated hole 103b.

[0019] (Regarding the stopper portion 14) The operating lever 10 is provided with a stopper portion 14 that restricts operation of the operating lever 10 when it is in the locked position. The stopper portion 14 is a protrusion and is made up of a front stopper portion 141, a rear stopper portion 142, a left stopper portion 143, and a right stopper portion 144, which are provided on the front, rear, left, and right sides of the operating lever 10. The left stopper portion 143 and the right stopper portion 144 are located lower than the front stopper portion 141 and the rear stopper portion 142.

[0020] The left stopper portion 143 and the right stopper portion 144 have inclined surfaces 145 on the left steering cam 121 side and the right steering cam 122 side, respectively. The inclined surfaces 145 are provided so as to descend from the operating lever 10 toward the steering cam 12. By having the inclined surfaces 145, even when the operating lever 10 is operated left or right, the inclined surfaces 145 can slide over the recessed plate 123, automatically returning it to the neutral position.

[0021] (Regarding control panel 11) As shown in Fig. 1, the control panel 11 is provided with a continuous guide groove 112 that is H-shaped in plan view, and guides the control lever 10. The control panel 11 is marked with arrows and letters and figures such as "turn" to prevent the operator from operating the control lever 10 erroneously. The neutral position of the control lever 10 is the center position of the guide groove 112, as shown in Fig. 1.

[0022] The operation panel 11 is provided with front and rear restricting portions 111 on the front and rear sides of the center thereof. As shown in Fig. 1, the front and rear restricting portions 111 are provided at a position higher than the operation panel 11. The front and rear restricting portions 111 restrict the operation of the operation lever 10 from the neutral position in the forward and backward directions.

[0023] 1, when the operating lever 10 is in the locked position, the front-rear restricting portion 111 is located at the same height as the front stopper portion 141 and the rear stopper portion 142. Therefore, even if the operator attempts to move the operating lever 10 forward or backward, the front stopper portion 141 and the rear stopper portion 142 interfere with the front-rear restricting portion 111, restricting the operation of the operating lever 10.

[0024] (Regarding the steering cam 12) The steering cam 12 regulates left and right operation of the operating lever 10. As will be described later, the steering cam 12 also enables the electric work machine to be turned. The steering cams 12 are located below the operation panel 11 and are provided in a pair on the left and right sides via the operating lever 10, consisting of a left steering cam 121 located on the left side of the operating lever 10 and a right steering cam 122 located on the right side of the operating lever 10. The left steering cam 121 and the right steering cam 122 each include a recessed plate 123 and a cam plate 124. Figure 3 is a perspective view of the right steering cam 122.

[0025] (Regarding the recessed plate 123) The recessed plate 123 is located below the operation panel 11 in parallel with the operation panel 11. It has a recessed shape that surrounds the operation lever 10. As shown in FIG. 4, when the operation lever 10 is in the locked position, the left stopper portion 143 and the right stopper portion 144 are located above the recessed plate 123. Therefore, even if the operator tries to move the operation lever 10 to the left or right, the left stopper portion 143 and the right stopper portion 144 interfere with the recessed plate 123 of the left steering cam 121 and the recessed plate 123 of the right steering cam 122, respectively, and therefore operation of the operation lever 10 is restricted.

[0026] Therefore, the operating lever 10 cannot be operated unless it is pushed down to the locked position, so that even if the operator accidentally hits the operating lever 10, erroneous operation can be prevented.

[0027] (Regarding the cam plate 124) The cam plate 124 is connected perpendicularly to the recessed plate 123. The cam plate 124 and the recessed plate 123 are connected in a rounded manner, but they may be connected in an angular manner. The cam plate 124 has the first shaft portion 20 inserted therethrough, which is swingable in the front-rear direction, so the steering cam 12 can also swing in the front-rear direction.

[0028] 3, the cam plate 124 is provided with, in order from top to bottom, a forward groove portion 124a, a neutral groove portion 124b, and a reverse groove portion 124c. The forward groove portion 124a, the neutral groove portion 124b, and the reverse groove portion 124c are curved and are driven by the rotation of the second rotor 51, allowing the second rotor 51 to slide between the groove portions.

[0029] (Regarding the first biasing means 13) 5, the first biasing means 13 is a spring that biases the operating lever 10 upward from below. One end of the first biasing means 13 is fixed to a front-to-rear swing plate 21 whose up-and-down movement is fixed by a first shaft 20, and the other end is fixed to the operating lever 10.

[0030] 6, the operator can put the operating lever 10 into the release position by pushing it downward. The release position is a position where the front stopper portion 141 and the rear stopper portion 142 are lower than the front-rear restricting portion 111, and the left stopper portion 143 and the right stopper portion 144 are lower than the recessed plate 123 of the left steering cam 121 and the recessed plate 123 of the right steering cam 122, respectively.

[0031] Because the front stopper portion 141 and the rear stopper portion 142 are located lower than the front-rear restricting portion 111, the front stopper portion 141 and the rear stopper portion 142 can operate the operating lever 10 forward and backward without interfering with the front-rear restricting portion 111. Furthermore, because the left stopper portion 143 and the right stopper portion 144 are located lower than the recessed plate 123 of the left steering cam 121 and the recessed plate 123 of the right steering cam 122, respectively, the left stopper portion 143 and the right stopper portion 144 can operate the operating lever 10 left and right without interfering with the recessed plate 123 of the left steering cam 121 and the recessed plate 123 of the right steering cam 122, respectively.

[0032] Therefore, the restriction on the operating lever 10 can be released and the electric working machine can be operated at the same time, which reduces the number of operations and reduces operational errors by the operator.

[0033] <Regarding the front / rear neutral retention structure 200> The longitudinal neutral holding structure 200 is a structure that holds the operating lever 10 in a neutral position when the operating lever 10 is operated in the longitudinal direction. The longitudinal neutral holding structure 200 mainly has a first shaft portion 20, a longitudinal swing plate portion 21, a longitudinal holding cam 22, a second shaft portion 23, a longitudinal holding link 24, a first rotating body 25, and a second biasing means 26.

[0034] (Regarding the front-rear swing plate portion 21) A first shaft 20 that can swing in the front-rear direction is inserted into the front-rear swing plate 21. Therefore, the front-rear swing plate 21 can also swing back and forth. A first biasing means 13 is provided above the front-rear swing plate 21. Because the first shaft 20 that cannot move in the up-down direction is inserted into the front-rear swing plate 21, the front-rear swing plate 21 cannot move in the up-down direction either. Therefore, the first biasing means 13 and the operating lever 10 fixed to the first biasing means 13 can move up and down using the front-rear swing plate 21 as a foothold.

[0035] 5, a third shaft 31 that can swing left and right is inserted into the front-rear swing plate 21 below the first shaft 20. A connecting portion 30 is also inserted into the third shaft 31 on the rear side.

[0036] (Regarding the front and rear holding cams 22) The front-rear holding cam 22 is a bow-shaped cam fixed below the front-rear swing plate portion 21. A curved recessed portion 221 is provided near the center of the front-rear holding cam 22. On the front and rear of the recessed portion 221, ridge portions 222 of the same height are formed continuous with the recessed portion 221.

[0037] The recessed portion 221 and the peak portion 222 of the front and rear holding cam 22 have a continuous curved surface shape, allowing the first rotor 25 to slide. The shape is symmetrical with respect to the recessed portion 221. The operating lever 10 is located at the center upper portion of the recessed portion 221.

[0038] (Regarding the front and rear holding links 24) The front-rear holding link 24 has a second shaft 23 inserted through the center thereof, allowing it to swing in the front-rear direction. The second shaft 23 is located forward and below the first shaft 20, and extends in the left-right direction.

[0039] A first rotor 25 is provided at one end 24a of the front-rear holding link 24. The first rotor 25 is a rotatable member such as a bearing, moves on the recess 221 of the front-rear holding cam 22, and is in contact with the front-rear swing plate 21 in response to the swing of the front-rear swing plate 21. Meanwhile, a second biasing means 26 is provided at the other end 24b of the front-rear holding link 24. The second biasing means 26 is located forward of the second shaft 23, and an elastic force acts downward. Therefore, the first rotor 25 biases the front-rear holding cam 22 with approximately the same force, with the second shaft 23 as a fulcrum.

[0040] The first rotor 25 is constantly biased upward by the second biasing means 26, so that the first rotor 25 is placed within the recess 221. Therefore, as shown in FIG. 7 , when the operator tilts the operating lever 10 forward along the guide groove 112, the operating lever 10, the connecting portion 30, and the longitudinal holding cam 22 tilt forward with the first shaft portion 20 as a fulcrum, and the first rotor 25 is driven to rotate forward and move out of the recess 221. At this time, the longitudinal holding link 24 is formed so that the first rotor 25 does not exceed the lowest part of the peak portion 222.

[0041] 8, when the operator tilts the operating lever 10 backward along the operating lever 10 guide groove 112, the operating lever 10, the connecting portion 30, and the front-rear holding cam 22 tilt backward with the first shaft portion 20 as a fulcrum, and the first rotating body 25 rotates and moves backward so as to come out of the recessed portion 221. At this time, the first rotating body 25 is formed so as not to exceed the lowest part of the peak portion 222.

[0042] Therefore, when the operator releases the operating lever 10 while tilting it forward or backward, the first rotating body 25 returns to the recessed portion 221, the first biasing means 13 biases the operating lever 10 upward, and the operating lever 10 can be automatically returned to the upright neutral position along the guide groove 112. As a result, the operator cannot operate the electric working machine unless he or she grips the operating lever 10 and continues to operate it by tilting it forward or backward, so the electric working machine will not move in an unintended direction and accidents can be prevented before they occur.

[0043] <Regarding the left-right neutral retention structure 300> The left-right neutral holding structure 300 is a structure that holds the operating lever 10 in a neutral position when the operating lever 10 is operated left or right. The left-right neutral holding structure 300 includes a connection portion 30, a third shaft portion 31, a swing plate portion hole 32, a connection portion hole 33, a third biasing means 34, and a biasing portion 35.

[0044] (Regarding the connection part 30) 7, 8, etc., the connection part 30 connects the operating lever 10 and the front-rear swing plate part 21, and includes a clamping plate 301 and a fixed plate 302. The clamping plate 301 is located below the stopper part 14 and is fixed at two points along the fixed part 103 of the operating lever 10 by clamping it from the left and right. The fixed plate 302 extends downward so as to intersect with the clamping plate 301, and is provided with a connection part hole 33 near the center, below which the third shaft part 31 is inserted.

[0045] (Regarding the third shaft portion 31) The third shaft 31 is a shaft that can swing left and right. The third shaft 31 passes through the front-rear oscillating plate 21 and the fixed plate 302 of the connection part 30, and is fixed with a bolt and a nut. The front-rear oscillating plate 21 does not swing left and right because it is fixed in the left and right direction by the first shaft 20, but the connection part 30 can swing left and right relative to the front-rear oscillating plate 21.

[0046] (Regarding the swing plate hole 32) 10, the front-rear oscillating plate 21 has an oscillating plate hole 32 extending in the front-rear direction below the first shaft 20 and above the third shaft 31. In this embodiment, the oscillating plate hole 32 is a circular through-hole.

[0047] A third biasing means 34 and a biasing portion 35 are provided inside the swing plate portion hole 32. In this embodiment, the third biasing means 34 is a spring, and one side 34a of the third biasing means 34 is fixed to the swing plate portion hole 32. The biasing portion 35 is fixed to the other side 34b of the third biasing means 34.

[0048] (Regarding the biasing portion 35) In this embodiment, the biasing portion 35 is a sphere, and the diameter of the biasing portion 35 is substantially the same as the diameter of the swing plate portion hole 32 and is formed to be larger than the diameter of the connection portion hole 33 .

[0049] In this embodiment, the biasing portion 35 does not have to be spherical, and may be, for example, conical on the fixed portion 103 side, and the shape is not limited to a sphere as long as it can move inside the oscillating plate portion hole 32 while biasing the outer periphery of the entrance 33a of the connection portion hole 33.

[0050] (Regarding the connection hole 33) 11, the fixed plate 302 of the connection part 30 has a connection part hole 33 extending in the front-rear direction, which is continuous with the swing plate part hole 32. The connection part hole 33 is a through hole, and is formed so that an entrance 33a of the connection part hole 33 is narrower than the biasing part 35.

[0051] 11, by forming the entrance 33a of the connection portion hole 33 so that it is narrower than the biasing portion 35, the biasing portion 35 biases the outer periphery of the entrance 33a of the connection portion hole 33 by the third biasing means 34. Therefore, even if the biasing portion 35 moves leftward in the drawing when the operating lever 10 is operated leftward or rightward to move the connection portion 30 leftward or rightward, the elastic force of the third biasing means 34 will cause the biasing portion 35 to move rightward in the drawing. As a result, even when the operating lever 10 is operated leftward or rightward, the biasing portion 35 can always be held in a neutral left-right position.

[0052] Furthermore, since the operating lever 10 is urged upward by the first urging means 13, even if the left stopper portion 143 and the right stopper portion 144 come into contact with the left steering cam 121 and the right steering cam 122, respectively, when the operating lever 10 moves from the release position to the lock position, the left stopper portion 143 and the right stopper portion 144 are provided with inclined surfaces 145, so that the left steering cam 121 and the right steering cam 122 slide on the inclined surfaces 145, allowing the operating lever 10 to move to the release position without interfering with the left steering cam 121 and the right steering cam 122, and to return to the left / right neutral position.

[0053] As a result, the operating lever 10 can be automatically returned to the upright neutral position along the guide groove 112. This means that the operator cannot operate the electric working machine unless he or she grasps the operating lever 10 and continues to operate it by tilting it to the left or right, preventing the electric working machine from moving in an unintended direction and preventing accidents from occurring.

[0054] <About forward and backward movement> When moving the electric working machine forward, the operator pushes down the operating lever 10 to move it from the locked position to the unlocked position, and then tilts the operating lever 10 forward along the guide groove 112. On the other hand, when moving the electric working machine backward, the operator pushes down the operating lever 10 to move it from the locked position to the unlocked position, and then tilts the operating lever 10 backward along the guide groove 112, thereby operating the electric working machine.

[0055] (Regarding the switch push plate 40) The switch push plates 40 are plates for pressing two switches 41 fixed to the front side of the front-rear swing plate portion 21. When the operating lever 10 is operated back and forth, the front-rear swing plate portion 21 also swings back and forth, and the switch push plates 40 fixed to the front-rear swing plate portion 21 also swing up and down in conjunction with the operation. The switch push plates 40 consist of an operation switch push plate 401 and a reversal switch push plate 402, each of which has an angular protrusion 403 formed on the front side, and the switch 41 can be turned ON or OFF by moving the protrusion 403 back and forth.

[0056] (About switch 41) The switches 41 are an operating switch 411 and a reversing switch 412, and are located in front of the switch push plate 40. The operating switch 411 is a switch that connects the electric circuit of the electric work machine. The reversing switch 412 is a direction change switch that determines whether the electric work machine moves forward or backward. The operating switch push plate 401 and the reversing switch push plate 402 are arranged to press the operating switch 411 and the reversing switch 412, respectively.

[0057] The operating switch 411 is a B contact, and when it is in the ON state, no current flows, and when it is in the OFF state, current flows. When the reversing switch 412 is in the ON state, the vehicle moves forward, and when it is in the OFF state, the vehicle moves backward.

[0058] In the neutral position, as shown in Figure 12(a), the protrusion 403 of the operation switch push plate 401 and the protrusion 403 of the reversal switch push plate 402 press the operation switch 411 and the reversal switch 412, both of which are in the ON state, and the electric work machine is in the brake state.

[0059] 12(b), when the operating lever 10 is tilted forward to the forward position, the activation switch 411 slides on the surface above the protrusion 403 of the activation switch press plate 401, causing the protrusion 403 of the activation switch press plate 401 to separate from the activation switch 411, turning the activation switch 411 OFF. On the other hand, the inclination angles of the surfaces below the protrusion 403 of the reversing switch press plate 402 and the activation switch press plate 401 are the same, and the protrusion 403 of the reversing switch press plate 402 has a more obtuse angle than the activation switch press plate 401. Therefore, the reversing switch press plate 402 is formed so as to protrude forward more than the activation switch press plate 401 even when it swings. Therefore, even if the operating lever 10 is tilted and swung forward, the protrusion 403 of the reversal switch push plate 402 does not leave the reversal switch 412 but slides on the surface above the protrusion 403 of the reversal switch push plate 402, and the reversal switch 412 remains ON, so that the electric work machine starts moving forward.

[0060] When the operating lever 10 is tilted backward to the reverse position, as shown in Figure 12(c), the protrusion 403 of the operation switch push plate 401 moves away from the operation switch 411, turning the operation switch 411 OFF. In addition, the protrusion 403 of the reversing switch push plate 402 also moves away from the reversing switch 412, turning the reversing switch 412 OFF, and the electric work machine starts moving backward.

[0061] <About turning left and right while moving forward> When the electric working machine is to be turned forward right or left, the operator pushes down the operating lever 10 to move it from the locked position to the unlocked position, then tilts the operating lever 10 to the left or right along the guide groove 112, and then tilts it forward to steer.

[0062] When the operating lever 10 is tilted left or right along the guide groove 112, the operating lever 10 fits into the recessed plate 123 of the steering cam 12, and assumes the state shown in Figure 13(a).After that, by tilting the operating lever 10 forward as shown in Figure 13(b), the operating lever 10 interferes with the recessed plate 123 and can tilt the steering cam 12 forward.

[0063] Conversely, as shown in FIG. 13(c), by tilting the operating lever 10 backward, the operating lever 10 interferes with the recessed plate 123 and can tilt the steering cam 12 backward.

[0064] (Regarding the left and right retaining links 50) The left and right holding links 50 are provided in a pair on the left and right sides via the operating lever 10, with the left holding link provided on the left side of the operating lever 10 and the right holding link 501 provided on the right side of the operating lever 10. As shown in FIG. 13 , the right holding link 501, together with the front and rear holding link 24, is a boomerang-shaped link through which the second shaft portion 23 is inserted and which is bent at the second shaft portion 23. Although not shown, the left holding link, like the right holding link 501, is also a boomerang-shaped link through which the second shaft portion 23 is inserted and which is bent at the second shaft portion 23.

[0065] As shown in FIGS. 14 and 15 , one end 50a of each left and right retaining link 50 is provided with a rotatable second rotor 51, a fourth biasing means 52 provided at the other end 50b of each left and right retaining link 50, and a wire 53 provided at the other end 50b of each left and right retaining link 50. As shown in FIG. 13 , the second rotor 51 is driven to move between the forward groove 124a, the neutral groove 124b, and the reverse groove 124c of the cam plate 124. The fourth biasing means 52 constantly biases the left and right retaining links 50 downward. By positioning the wire 53 outside the fourth biasing means 52, the amount of change in tension of the wire 53 can be increased.

[0066] (Regarding forward right turns) After the operating lever 10 is pushed down to change from the locked position to the unlocked position, it is tilted to the right along the guide groove 112 to fit into the recessed plate 123 of the right steering cam 122, and then the operating lever 10 is tilted forward to interfere with the recessed plate 123, and the right steering cam 122 is also tilted forward. The right steering cam 122 rotates around the first rotating part 20 as a fulcrum. As the right steering cam 122 rotates, the second rotating body 51 fitted in the neutral groove portion 124b moves to the forward groove portion 124a while rotating and fits into it.

[0067] 13(b) and 14, as the second rotor 51 slides and follows the forward movement groove 124a, the right retaining link 501 simultaneously rotates counterclockwise around the second shaft 23. As a result, the wire 53 attached to the other end of the right retaining link 501 is pulled. When the wire 53 is pulled, the right axle of the transmission mounted on the electric operating machine is locked.

[0068] As described above, when the operating lever 10 is tilted forward, the switch push plate 40 simultaneously turns the switch 41 ON or OFF, causing the electric work machine to start moving forward. Therefore, only the left axle moves forward and the right axle is locked, allowing the machine to turn right while moving forward.

[0069] (Regarding reverse left turns) After the operating lever 10 is pushed down to change from the locked position to the unlocked position, it is tilted to the right along the guide groove 112 to fit into the recessed plate 123 of the right steering cam 122, and then the operating lever 10 is tilted backward so that it interferes with the recessed plate 123, and the right steering cam 122 is also tilted backward. The right steering cam 122 rotates around the first shaft 20 as a fulcrum. As the right steering cam 122 rotates, the second rotor 51 fitted in the neutral groove 124b moves to the reverse groove 124c while rotating and fits into it.

[0070] 13(c), as the second rotor 51 slides and follows the rotation up to the reverse groove portion 124c, the right retaining link 501 simultaneously rotates counterclockwise around the second shaft portion 23 as a fulcrum. As a result, the wire 53 attached to the other end of the right retaining link 501 is pulled. When the wire 53 is pulled, the right axle of the transmission mounted on the electric working machine is locked.

[0071] As described above, when the operating lever 10 is tilted backward, the switch push plate 40 simultaneously turns the switch 41 ON or OFF, causing the electric work machine to start moving backward. Therefore, only the left axle moves backward and the right axle is locked, allowing the machine to make a right turn while moving backward.

[0072] (Other turning matters) Although not shown, the left and right retaining links 50 and the steering cam 12 are symmetrical, so that forward left turning and backward left turning can be performed in the same way by similarly pushing down the operating lever 10 to change it from the locked position to the unlocked position, and then tilting the operating lever 10 to the left along the guide groove 112 and then tilting it back and forth. [Explanation of symbols]

[0073] 100 Traveling lever device 10 Operating lever 101 Gripper 102 Lever part 103 Fixed part 103a 1st long hole 103b 2nd long hole 11 Control panel 111 Front and rear restrictor 112 Guide groove 12 Steering cam 121 Left steering cam 122 Right steering cam 123 Recessed plate 124 Cam plate 124a Advance groove 124b Neutral groove 124c Reverse groove 13 First biasing means 14 Stopper part 141 Front stopper part 142 Rear stopper part 143 Left stopper part 144 Right stopper part 145 Slope 200 Front and rear neutral holding structure 20 First shaft 21 Front and rear swing plate 22 Front and rear holding cam 221 recess 222 Yamabe 23 Second shaft 24 Front and rear retaining links 24a one end 24b other end 25 First Rotating Body 26 Second biasing means 300 Left / right neutral holding structure 30 Connection 301 Clamp 302 Fixed plate 31 Third axis 32 Swing plate hole 33 Connection hole 33a Entrance 34 Third biasing means 34a One side 34b Other side 35 energizing section 40 Switch push plate 401 Operating switch push plate 402 Reversing switch push plate 403 Protrusion 41 Switch 411 Operation switch 412 Reverse Switch 50 Left and right retaining links 50a one end 50b other end 501 Right retaining link 51 Second Rotating Body 52 Fourth biasing means 53 Wire

Claims

1. A travel lever device for an electric work machine, an operation lever that is manually operated by an operator of the electric working machine to operate the machine; an operation panel that guides the operation lever and has a continuous guide groove; a pair of left and right steering cams located below the operation panel and connected to the travel lever; a first biasing means for biasing the operating lever upward from below, The operating lever includes a stopper portion, The operation panel includes a front-rear restricting portion at the center thereof that restricts the operation of the operation lever from a neutral position to a front-rear position, The steering cam includes a recessed plate parallel to the operation panel and a cam plate connected perpendicularly to the recessed plate, The operating lever has a lock position where the stopper portion interferes with the recessed plate or the front-rear regulating portion to regulate operation of the operating lever; When the operating lever is pushed downward, the stopper portion passes below the recessed plate or the front-to-rear regulating portion, and the operating lever can be moved to a release position, where the operating lever can be operated.

2. The stopper portion includes a front stopper portion, a rear stopper portion, a left stopper portion, and a right stopper portion, which are provided on the front, rear, left, and right sides of the operating lever, respectively, The steering cams include a left steering cam located on the left side of the travel lever and a right steering cam located on the right side of the travel lever, the left stopper portion and the right stopper portion are located lower than the front stopper portion and the rear stopper portion, 2. The travel lever device according to claim 1, wherein the left stopper portion and the right stopper portion are provided with slopes on the left steering cam side and the right steering cam side, respectively.

3. a front-rear neutral holding mechanism that holds the operating lever in a neutral position when the operating lever is operated in the front-rear direction, The front-rear neutral holding structure is a first shaft portion that allows the operating lever to swing back and forth; a front-rear swing plate portion through which the first shaft portion is inserted; a front-rear holding cam fixed to a lower portion of the front-rear swing plate portion and having a curved recessed portion; a second shaft portion that can swing in the front-rear direction; a front and rear holding link through which the second shaft portion is inserted; a first rotor provided at one end of the front and rear holding link; a second biasing means provided at the other end of the front and rear holding link, 3. The travel lever device according to claim 1, wherein the first rotor is in contact with the curved surface of the recessed portion in response to the swing of the front-rear swing plate portion.

4. a left / right neutral holding mechanism that holds the operating lever in a neutral position when the operating lever is operated in the left / right direction, The left and right neutral holding mechanism is a connection portion fixed to the operating lever; a third shaft portion that communicates with the longitudinal swing plate portion and the connecting portion and allows the operating lever and the connecting portion to swing left and right relative to the longitudinal swing plate portion; a swing plate hole provided in the front-rear swing plate in parallel with the third shaft; a connection portion hole provided in the connection portion so as to be continuous with the swing plate portion hole; a third biasing means, one side of which is fixed inside the swing plate hole; a biasing portion fixed to the other side of the third biasing means and biasing the outer periphery of the inlet of the connection portion hole; 3. The travel lever device according to claim 1, further comprising:

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