Brake lock device and service car provided with brake lock device

Abstract

To provide a brake lock device which can keep the brake pedal in a locked state while preventing unintended disengagement, without reducing braking force and while minimizing costs, as well as a service car provided with the device.SOLUTION: A brake lock device comprises a brake lamp switch 30 which switches the turning on and off of a brake lamp, an attachment metal fitting 31 which attaches the brake lamp switch 30 to a vehicle body, a brake pedal which includes a brake arm 21 provided with a bracket 23 for turning on / off the brake lamp switch 30, and a brake lock member 10. The brake lock member 10 includes a hook part 12 which hooks on the brake arm 21 so as to make it possible to slide and move along the longer direction of the brake arm 21 and a lock part 14 which locks the operation state of a brake by sliding and moving the hook part 12 to insert it between the bracket 23 and the attachment metal fitting 31.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a brake lock device that locks the brakes in an activated state when the brake pedal of an automobile is depressed, and to a work vehicle equipped with said brake lock device. [Background technology]

[0002] Conventionally, in order to ensure safety when a work vehicle equipped with a work device (such as a lifting device or a crane) on a travelable vehicle body is parked at a work site and work is performed using the work device, there have been proposed ideas to prevent the work vehicle from moving unintentionally when or during grounding work with a jack. For example, a work vehicle with a jack described in Patent Document 1 is provided with a work machine with a bucket for a worker to ride on at the tip of a telescopic boom that can be rotated and raised and lowered on the vehicle body, and is equipped with jacks on the front, rear, left and right sides of the vehicle body, and when there is no one in the driver's seat inside the vehicle cab (i.e., when the driver cannot immediately step on the foot brake), the extension of each jack is not allowed.

[0003] Furthermore, the work vehicle described in Patent Document 2 is fitted with an auxiliary braking device that, when a specific operating switch is operated with the brake pedal depressed, keeps the front and rear wheels in a braked state even after the brake pedal is released. As a result, when working on sloping ground using an aerial work vehicle, the parking brake is applied, the auxiliary braking device is operated to keep the front and rear wheels in a braked state, and the jack is extended and retracted in this state, preventing the vehicle from running away on sloping ground.

[0004] Separately, a brake pedal holder described in Patent Document 3 has a substantially C-shaped brake pedal presser at one end of a support pillar, the length of which can be adjusted by screwing two pipes together, and a U-shaped fixture at the other end. To lock the brake pedal of an automobile using this brake pedal holder, the substantially C-shaped presser is first inserted into the tip of the brake pedal, and then the brake pedal is depressed. In this state, the U-shaped fixture is inserted into the lower part of the dash panel of the driver's seat, thereby maintaining the brake pedal in a depressed state. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-229446 A [Patent Document 2] JP 2005-324671 A [Patent Document 3] Japanese Utility Model Application Publication No. 6-16167 Summary of the Invention [Problem to be solved by the invention]

[0006] The jack-equipped work vehicle described in Patent Document 1 requires at least two workers to operate the jack unless someone is in the driver's seat, and there is a problem that the work efficiency is reduced because it cannot be done by one person. In addition, the auxiliary braking device of the work vehicle described in Patent Document 2 has the problem that when used continuously for a long period of time, the air pressure for keeping the brake pedal depressed decreases over time, and the component parts are heavily burdened, accelerating the deterioration of the component parts (mainly rubber parts), which can cause a decrease in braking force. In addition, since it is built into the vehicle body in advance, it is not possible to add a vehicle lock brake device by retrofitting it later according to the user's request, and there is also the problem that the cost of the vehicle increases by the amount of the vehicle lock brake device. In addition, the brake pedal holder described in Patent Document 3 locks the brake pedal, This creates a support pillar that extends from the brake pedal position to the bottom of the driver's seat dash panel, so if the driver gets in or out of the driver's seat with the brake pedal holder attached, there is a risk that the driver's foot will get caught on the support pillar, causing the brake pedal holder to come off.

[0007] The present invention has been made in consideration of such problems, and aims to provide a brake lock device that can reduce costs and make it difficult for the brake pedal to be unintentionally released from a locked state without reducing braking force, and a work vehicle equipped with such a brake lock device. [Means for solving the problem]

[0008] In order to solve the above problems, the brake lock device of the present invention comprises a brake light switch for turning the brake lights on and off, a mounting bracket for attaching the brake light switch to the vehicle body, a suspended brake pedal having a long brake arm equipped with a bracket for turning the brake light switch on and off, and a brake lock member for locking the brakes in an activated state when the brake pedal is operated, wherein the brake lock member has a hook portion that hooks onto the brake arm so as to be slidable along the longitudinal direction of the brake arm, and a lock portion that is fixed to the hook portion and locks the brakes in an activated state by sliding the hook portion to insert it between the bracket and the mounting bracket.

[0009] In addition, in the brake lock device of the above configuration, it is preferable that the brake lock member has a stopper portion that prevents the hook portion from sliding toward the mounting bracket when the brake lock member is hooked to the brake arm by the hook portion and the lock portion is positioned between the bracket and the mounting bracket.

[0010] In addition, in a brake lock device of any of the above configurations, it is preferable that the brake lock member is provided with a partition portion which prevents a foot placed on the brake pedal pad from moving in the direction of an accelerator pedal provided next to the brake pedal when the brake lock member is engaged with the brake arm by the hook portion and the lock portion is positioned between the bracket and the mounting bracket.

[0011] In addition, in a brake lock device of any of the above configurations, it is preferable that the brake lock member is provided with a depression preventing portion that prevents the accelerator pedal provided next to the brake pedal from being depressed when the brake lock member is engaged with the brake arm by the hook portion and the lock portion is positioned between the bracket and the mounting bracket.

[0012] Moreover, the work vehicle according to the present invention comprises a drivable vehicle body, a working device provided on the vehicle body, a jack device capable of lifting and supporting the vehicle body, and the brake lock device. Effect of the Invention

[0013] The brake lock device according to the present invention includes a brake light switch for turning the brake lights on and off, a mounting bracket for mounting the brake light switch to the vehicle body, a suspended brake pedal having a long brake arm provided with a bracket for turning the brake light switch on and off, and a brake lock member, the brake lock member having a hook portion hooked to the brake arm so as to be slidable along the longitudinal direction of the brake arm, and a lock portion fixed to the hook portion and locking the brake in an activated state by sliding the hook portion to be inserted between the bracket and the mounting bracket. In this way, the brakes can be locked with a small configuration, namely the hook portion and lock portion of the brake lock member, thereby reducing the cost of the brake lock device. Also, the brake lock member has a hook portion hooked to the brake arm so as to be slidable along the longitudinal direction of the brake arm, and a lock portion fixed to the hook portion and locking the brake in an activated state by sliding the hook portion to be inserted between the bracket and the mounting bracket. Since the brake is locked by inserting the locking portion between the bracket and the mounting bracket with the brake lock member hooked onto the brake arm, no air pressure is required to keep the brake pedal depressed, there is no risk of the braking force decreasing over time, and it is possible to reduce the risk of the brake lock member coming off the brake arm if, for example, an operator unintentionally catches his foot on the brake lock member.

[0014] Furthermore, in the brake lock device of the above configuration, the brake lock member has a stopper portion that prevents the hook portion from sliding toward the mounting bracket when the lock portion is positioned between the bracket and the mounting bracket with the hook portion hooked to the brake arm, thereby allowing the lock portion of the brake lock member to be easily and accurately set between the bracket and the mounting bracket.

[0015] Furthermore, in a brake lock device of any of the above configurations, when the hook portion is hooked onto the brake arm and the lock portion is positioned between the bracket and the mounting bracket, a partition portion may be provided that prevents the foot placed on the brake pedal pad from moving toward the accelerator pedal, or a depression blocking portion may be provided that prevents the accelerator pedal from being depressed, thereby reducing the risk of the foot placed on the brake pedal pad inadvertently depressing the accelerator pedal.

[0016] In addition, in a work vehicle equipped with a drivable body, a working device attached to the body, a jack device capable of lifting and supporting the body, and a brake lock device, an operator can lock the brake actuation state when the brake pedal is operated using the brake lock member, and then the operator can safely operate the jack device, eliminating the need for two operators to operate the jack device, thereby improving work efficiency and reducing the number of workers required while ensuring safety. [Brief description of the drawings]

[0017] [Figure 1] 1 is a side view of a vehicle for working at height equipped with a brake lock device according to a first embodiment of the present invention. [Diagram 2] 3A to 3C are three-view diagrams of a brake lock member used in the brake lock device. [Diagram 3] FIG. 2 is a perspective view and an exploded perspective view of the brake lock member according to the first embodiment. [Figure 4] 5 is an explanatory diagram for explaining dimensions etc. of a locking portion of the brake lock member. FIG. [Diagram 5] FIG. 2 is an explanatory diagram for explaining a procedure for locking the brake in the brake lock device according to the first embodiment of the present invention. [Figure 6] 5A to 5C are explanatory diagrams for explaining a procedure for locking the brakes in the brake lock device. [Figure 7] 10A to 10C are three-view diagrams of a brake lock member used in a brake lock device according to a second embodiment of the present invention. [Figure 8] 11A and 11B are a perspective view and an exploded perspective view of the brake lock member according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. [First embodiment] First, the overall configuration of a vehicle 100 for working at height that is equipped with a brake lock device according to a first embodiment of the present invention will be described with reference to Fig. 1. In the description with reference to Fig. 1, when the front-rear and up-down directions are mentioned, the directions of the arrows shown in Fig. 1 are followed. As shown in Fig. 1, the vehicle 100 for working at height has a driver's cabin 103 at the front of a vehicle body 102, and The vehicle is based on a truck vehicle that can run on a pair of left and right tires and wheels 104 attached to each other. The vehicle body 2 is configured with a vehicle body frame that includes a chassis frame on which the four tires and wheels 104 (left front wheel, left rear wheel, right front wheel, and right rear wheel) are arranged, and a subframe attached to the chassis frame. Note that only the left front wheel 104Lf and the left rear wheel 104Lr are shown in Fig. 1, and the right front wheel 104 and the right rear wheel 104 are not shown.

[0019] Jack devices 105 for lifting and supporting the vehicle body 102 during high-altitude work are provided on the front, rear, left and right sides of the vehicle body 102. The jack devices 105 are composed of a left front jack 105Lf disposed behind the left front wheel 104Lf, a left rear jack 105Lr disposed behind the left rear wheel 104Lr, a right front jack 105 (not shown) disposed behind the right front wheel 104, and a right rear jack 105 (not shown) disposed behind the right rear wheel 104. Each jack device 105 drives a jack cylinder (not shown) provided therein to extend downward so that the tip of the jack device 105 touches the ground, and by further extending the jack cylinder from that state, the vehicle body 102 is lifted and supported, and the entire vehicle is stabilized.

[0020] Tool boxes 106 for storing work tools and equipment are provided on the left and right sides of the mounting part located behind the driver's cabin 103 of the vehicle body 102. A swivel base 120 is provided on the mounting part of the vehicle body 102 and is configured to be horizontally rotatable about a vertical axis, driven by a swivel motor 121. The base end of a boom 130 is attached to a support column 122 extending upward from the swivel base 120 via a foot pin 123 so as to be vertically swingable (raised and lowered).

[0021] The boom 130 has a configuration in which, from the swivel base 120 side, a base end boom 130a, an intermediate boom 130b, and a tip end boom 130c are nested together, and a telescopic cylinder (not shown) provided inside thereof telescopically moves, thereby enabling the boom 130 to telescope in the axial direction (longitudinal direction). In addition, a hoisting cylinder 124 is provided between the base end boom 130a and the support 122, and the entire boom 130 can be raised and lowered in the up-down plane (vertical plane) by telescopically moving the hoisting cylinder 124.

[0022] A vertical post 132 is pivotally supported at the tip of the tip boom 130c so as to be swingable about an axis in the left-right direction. The vertical post 132 is swing-controlled (leveling-controlled) by an upper leveling cylinder 133 straddling between the tip of the tip boom 130c and the vertical post 132, and a lower leveling cylinder 134 straddling between the base boom 130a and the support 122, so that the vertical post 132 is always kept in a vertical position regardless of the elevation of the boom 30. A work platform 140 for an operator to ride on is attached to the vertical post 132 via a work platform bracket (not shown). A swivel motor 141 is provided inside the work platform bracket, and the swivel motor 141 can rotate forward and backward to swing (horizontally rotate) the entire work platform 140 about the vertical post 132. Here, in the vehicle for working at height 100, the above-mentioned swivel platform 120, the boom 130, and the work platform 140 constitute a working device 110.

[0023] The work platform 140 is provided with an upper operating device 145 equipped with various operating means such as operating levers, operating switches, and operating dials that are operated by a worker on the work platform. Therefore, a worker on the work platform 140 can control the drive of the telescopic cylinder, the swivel motor 121, the derrick cylinder 124, and the oscillating motor 141 by operating the upper operating device 145. As a result, the boom 130 extends and retracts in response to the telescopic movement of the telescopic cylinder, the swivel base 120 rotates in response to the rotation of the swivel motor 121, the boom 130 rises and dangles in response to the telescopic movement of the derrick cylinder 124, and the work platform 140 oscillates in response to the forward and reverse rotation of the swivel motor 141. It moves.

[0024] A lower operating device 127 is provided at the rear end of the vehicle body 102, and is capable of controlling the drive of the telescopic cylinder, the swing motor 121, and the hoisting cylinder 124. In addition to this, it is also capable of controlling the drive of each of the jack cylinders described above, so that the jack device 105 moves up and down in response to the telescopic movement of each jack cylinder.

[0025] Generally, when working at a work site using the vehicle for aerial work 100, the vehicle for aerial work 100 is stopped and the parking brake is activated to brake the left and right rear wheels 104. Then, the left front jack 105Lf and the right front jack 105 are first extended to lift up the front part of the vehicle for aerial work 100, and then the left rear jack 105Lr and the right rear jack 105 are extended to lift up and support the entire vehicle for aerial work 100.

[0026] Next, a first embodiment of a brake lock member used in a brake lock device according to the present invention will be described with reference to Figures 2 and 3. Figure 2 is a three-sided view of a brake lock member 10 used in the brake lock device of this embodiment, where (a) is a plan view, (b) is a front view, and (c) is a side view seen from the direction of arrow A in the front view of (b). Figure 3 is an external view of the brake lock member 10 used in the brake lock device of this embodiment, where (a) is a perspective view, and (b) is an exploded perspective view. In the following description, when referring to the front-rear, left-right, and up-down directions of the brake lock member 10, the arrows shown in Figures 2 and 3 shall be used.

[0027] As shown in Fig. 3(b), the brake lock member 10 used in the brake lock device of this embodiment is composed of a base portion 11, a hook portion 12, a spacer portion 13, a lock portion 14, a stopper portion 15, and a partition portion 16. The hook portion 12 is composed of a first hook portion 12a and a second hook portion 12b having the same shape, and as shown in Fig. 2(b), the first hook portion 12a and the second hook portion 12b are composed of a substantially rectangular plate material whose long side is in the front-rear direction. The first hook portion 12a and the second hook portion 12b are arranged in parallel with a predetermined interval w (see Figs. 2(a) and (c)), and the upper side of each hook portion is fixed to the lower surface of the base portion 11.

[0028] A spacer portion 13 is fixed to the front of the right side surface of the second hook portion 12b. The spacer portion 13 is a rectangular plate material with its long sides extending in the vertical direction, and a lock portion 14 is fixed to the right side surface of the spacer portion 13. The lock portion 14 has a substantially rectangular parallelepiped shape, and is inserted between a mounting metal fitting 31 of a brake light switch 30 (described later) and a bracket 23 formed on the brake arm 21 to maintain the brake pedal 20 in a depressed state (more specifically, a state in which the brake is activated). A notch portion NT is provided at a corner on the front upper side of the lock portion 14, and the provision of this notch portion NT makes it easier to insert the lock portion 14 between the mounting metal fitting 31 and the bracket 23 described above.

[0029] A stopper portion 15 is fixed to the right side surface of the lock portion 14. The stopper portion 15 is a plate-shaped member of an L-shaped angle having a longitudinal direction in the up-down direction and a surface extending in the front-rear direction and the left-right direction. The stopper portion 15 also functions as a handle when an operator attaches the brake lock member 10 to the brake pedal 20 described later, and also has a positioning function for positioning the lock portion 14 at an appropriate position between the mounting metal fitting 31 and the bracket 23. A partition portion 16 is formed at the right end portion of the base portion 11. The partition portion 16 is formed so as to rise upward from the right end portion of the base portion 11 and extend further rearward from the rear end portion of the base portion 11. The partition portion 16 is provided to prevent an operator from stepping on the accelerator pedal 40 provided to the right of the brake pedal 20 when the operator places his / her foot on the brake pedal 20.

[0030] Next, the brake pedal 20 to which the above-mentioned brake lock member 10 is applied and its surrounding configuration will be described with reference to FIG. 4. Here, FIG. 4(a) is a front view of the brake pedal 20 and its surrounding configuration provided in the driver's cabin 103, and an accelerator pedal (not shown) is provided to the right of the brake pedal 20. Also, FIG. 4(b) is a side view of the brake pedal 20 and its surrounding configuration viewed from the accelerator pedal side. Note that FIG. 4(a) shows a state (initial state) in which the brake pedal 20 is not depressed and the brake is not applied, and FIG. 4(b) shows the initial state of the brake pedal 20 with a broken line and a state (brake applied state) in which the brake pedal 20 is depressed and the brake is applied. Note that, when the brake pedal 20 is released while the brake is applied, the brake pedal 20 is returned to the position of the initial state by a spring (not shown) provided on the vehicle body.

[0031] 4, the brake pedal 20 is a suspended brake pedal mainly composed of a brake arm 21 made of a long plate-like member and a pedal pad 22 provided on the brake arm 21, and a rectangular plate-like bracket 23 is formed to protrude from the right side surface of the brake arm 21. A brake lamp switch 30 is provided at a position facing this bracket 23, and the brake lamp switch 30 is fixed to the vehicle body (not shown) by a mounting bracket 31.

[0032] The brake lamp switch 30 is a plunger-type limit switch in which a plunger protrudes from a body by the biasing force of a return spring. When the brake pedal 20 is in the initial state, the plunger of the brake lamp switch 30 is pushed into the body of the brake lamp switch 30 by the bracket 23 against the biasing force of the return spring, thereby turning the brake lamp switch 30 off. When the brake pedal 20 is depressed and the bracket 23 separates from the plunger of the brake lamp switch 30, the biasing force of the return spring causes the plunger to protrude from within the body of the brake lamp switch 30, thereby turning the brake lamp switch 30 on. When the brake lamp switch 30 is turned off, the vehicle's brake lamps (not shown) are turned off, and when the brake lamp switch 30 is turned on, the brake lamps are turned on.

[0033] Next, the dimensions and mounting positions of the various parts of the brake lock member 10 shown in Figs. 2 and 3 will be described with reference to the brake pedal 20 and its peripheral configuration shown in Fig. 4. First, the interval w between the first and second hook portions 12a and 12b shown in Figs. 2(a) and (c) is at least greater than the thickness t (see Fig. 4(a)) of the brake arm 21. This allows the brake arm 21 to be hooked so that the area surrounded by the first and second hook portions 12a and 12b and the brake lock member 10 straddles the brake arm 21 by inserting the brake arm 21 between the first and second hook portions 12a and 12b. It is preferable that the interval w is at least large enough to allow the brake lock member 10 to slide in the longitudinal direction of the brake arm 21.

[0034] In addition, the thickness of the spacer portion 13 is dimensioned so that, when the brake lock member 10 is attached to the brake pedal 20, the lock portion 14 is positioned so that it can reliably abut against the plunger of the brake light switch 30 in the left-right direction in Figure 4(a).

[0035] Next, as shown in Fig. 2(b), the locking portion 14 is fixed facing upward at an angle θ with respect to the front-rear direction of the base portion 11, the first hooking portion 12a, and the second hooking portion 12b. This angle θ coincides with the angle θ formed between the upper side US of the brake arm 21 and the bracket 23 shown in Fig. 4(b). This makes it possible to increase the contact area between the locking portion 14 and the bracket 23 when the locking portion 14 is inserted between the brake lamp switch 30 and the bracket 23 to maintain the brake in an actuated state, and therefore makes it possible to increase the contact area between the brake lamp switch 30 and the bracket 23. The inserted lock portion 14 can be stably held.

[0036] In addition, in Figure 2 (b), the length L by which the lock portion 14 protrudes forward from the front edges of the base portion 11, the first hook portion 12a, the second hook portion 12b, the spacer portion 13 and the stopper portion 15 is determined so that when the brake lock member 10 is hooked to the brake pedal 20 and the stopper portion 15 abuts against the mounting bracket 31, the lock portion 14 is securely inserted between the brake light switch 30 and the bracket 23.

[0037] 2(b) is greater than the distance H between the brake lamp switch 30 and the bracket 23 when the brake pedal 20 is depressed to the position of the brake arm 21 shown by the solid line in FIG. 4(b) (brake actuated state). This makes it possible to maintain the brake actuated state when the locking portion 14 is sandwiched between the brake lamp switch 30 and the bracket 23. Furthermore, the width d of the locking portion 14 shown in FIG. 2(a) is such that it can at least come into contact with the plunger of the brake lamp switch 30 and the stopper portion 15 can abut against the mounting bracket 31 when the brake lock member 10 is engaged with the brake pedal 20 in FIG. 4(a).

[0038] Next, referring to Fig. 5 and Fig. 6, a procedure for attaching the brake lock member 10 to the brake pedal 20 in the brake lock device 1 of this embodiment will be described. In Fig. 5 and Fig. 6, the same components as those shown in Fig. 2 to Fig. 4 are given the same reference numerals, and detailed description thereof will be omitted. In Fig. 5(a) to (c) and Fig. 6(a) and (b), the left side shows a front view of the brake pedal 20 and its peripheral configuration, and the right side shows a side view of the brake pedal 20 and its peripheral configuration. In addition, the front view of the brake pedal 20 and its peripheral configuration shows the accelerator pedal 40 to the right of the brake pedal 20. In addition, the side view of the brake pedal 20 and its peripheral configuration shows the side of the brake pedal 20 and its peripheral configuration as seen from the accelerator pedal 40 side, but the accelerator pedal 40 is omitted.

[0039] First, in the initial state of the brake pedal 20 shown in FIG. 5(a), the operator inserts the brake arm 21 between the first hook portion 12a and the second hook portion 12b of the brake lock member 10 as shown in FIG. 5(b) to hook the brake lock member 10 to the brake arm 21. Here, the position where the brake lock member 10 is hooked is between the pedal pad 22 and the bracket 23 in the vertical direction of the brake pedal 20. Then, the operator depresses the pedal pad 22 with his foot to push down the brake pedal 20 in the direction of the arrow B in the right-hand drawing. As a result, the bracket 23 moves away from the mounting metal fitting 31 as shown in FIG. 5(c) (at this time, the brake lamp switch 30 is turned on), and the operator grips the stopper portion 15 to slide the brake lock member 10 toward the mounting metal fitting 31 (in the direction of the arrow C in the right-hand drawing).

[0040] Then, as shown in FIG. 6(a), when the stopper portion 15 of the brake lock member 10 abuts against the mounting bracket 31 and the sliding movement stops, the worker gradually releases the foot placed on the pedal pad 22 while maintaining that state. As a result, the brake pedal 20 returns in the direction of the arrow D in the right-hand drawing due to the biasing force of the spring. After that, when the lock portion 14 abuts against the mounting bracket 31 as shown in FIG. 6(b) (at this time, the plunger of the brake lamp switch 30 is pushed in and turned off), the worker releases the stopper portion 15 and removes his foot from the pedal pad 22. As a result, the lock portion 14 is held in a state where it is sandwiched between the mounting bracket 31 and the bracket 23 by the biasing force of the spring of the brake pedal 20, and the brake can be maintained in an actuated state. Then, the worker can safely operate the jack device 105 with the brakes actuated by the brake lock member 10. Therefore, two operators are not required to operate the jack device 105, and it is possible to improve the efficiency of the work and reduce the number of workers while ensuring safety.

[0041] Here, since the brake lamp switch 30 is turned off while the lock portion 14 is clamped between the mounting metal fitting 31 and the bracket 23, the brake lamps are not continuously lit while the brakes are maintained in an actuated state, which would consume the battery mounted on the vehicle body. Furthermore, while the brake lock member 10 is attached to the brake pedal 20, the partition portion 16 of the brake lock member 10 separates the brake pedal 20 from the accelerator pedal 40, which prevents the operator from inadvertently moving his or her foot, which is placed on the pedal pad 22 of the brake pedal 20, sideways and stepping on the accelerator pedal 40.

[0042] [Second embodiment] Next, a second embodiment of a brake lock member used in a brake lock device according to the present invention will be described with reference to Figures 7 and 8. Figure 7 is a three-sided view of a brake lock member 10' used in a brake lock device of this embodiment, where (a) is a plan view, (b) is a front view, and (c) is a side view seen from the direction of arrow E in the front view of (b). Figure 8 is an external view of the brake lock member 10' used in the brake lock device of this embodiment, where (a) is a perspective view, and (b) is an exploded perspective view. In the following description, when referring to the front-rear, left-right, and up-down directions of the brake lock member 10', the arrows shown in Figures 7 and 8 shall be used.

[0043] 7 and 8, the same components as those of the brake lock member 10 described in the first embodiment are given the same reference numerals and detailed description thereof will be omitted. The brake lock member 10' in this embodiment differs from the brake lock member 10 in the first embodiment in that, while the brake lock member 10 in the first embodiment has a partition portion 16 formed at the right end of the base portion 11, the brake lock member 10' in this embodiment has a step-on prevention portion 17 formed at the right end of the base portion 11.

[0044] As shown in Fig. 7(c), the stepping-inhibiting portion 17 is a plate-like member that rises upward from the right end of the base portion 11 and further extends horizontally to the right. Here, the width d of the stepping-inhibiting portion 17 in the left-right direction is a dimension that can cover and hide the accelerator pedal provided to the right of the brake pedal when the brake lock member 10' is attached to the brake pedal. By forming the stepping-inhibiting portion 17 on the base portion 11 in this manner, for example, even if an operator attempts to step on the accelerator pedal with the brake lock member 10' attached to the brake pedal, the stepping-inhibiting portion 17 will prevent the operator from stepping on the accelerator pedal, and therefore the vehicle can be prevented from starting with the brake lock member 10' attached to the brake pedal.

[0045] The fixing method for each part of the brake lock member 10, 10' in each of the above-mentioned embodiments can be appropriately selected from welding, adhesive, screwing, or a combination of these fixing methods. Also, some or all of the parts of the brake lock member 10, 10' may be molded integrally. Furthermore, although the partition part 16 and the step-in prevention part 17 are integrally formed at the right end part of the base part 11, they may each be configured as separate members. [Explanation of symbols]

[0046] 1 Brake lock device 10,10' Brake lock member 11 Base 12 Latch part 12a 1st hook part 12b 2nd hook part 13 Spacer part 14 Lock Section 15 Stopper part 16 Partition 17 Stepping prevention part 20 Brake pedal 21 Brake arm 22 Pedal Pad 23 Bracket 30 Brake light switch 31 Mounting bracket 100 Aerial work platform 102 Body 103 Driver's Cabin 105 Jacking device 105Lf Left front jack 105Lr Left rear jack 110 Work equipment

Claims

1. A brake light switch that turns the brake lights on and off; A mounting bracket for mounting the brake lamp switch to a vehicle body; a suspension-type brake pedal having a long brake arm provided with a bracket for turning the brake light switch on and off; a brake lock member that locks the brakes in an actuated state when the brake pedal is operated, The brake lock member is a hook portion that hooks onto the brake arm so as to be slidable along a longitudinal direction of the brake arm; a lock portion fixed to the hook portion and locking the activated state of the brake by sliding the hook portion and inserting it between the bracket and the mounting bracket.

2. The brake lock member is A brake lock device as described in claim 1, characterized in that it has a stopper portion that prevents the hook portion from sliding toward the mounting bracket when the brake lock member is hooked to the brake arm by the hook portion and the lock portion is positioned between the bracket and the mounting bracket.

3. The brake lock member is A brake lock device as described in claim 1 or 2, characterized in that when the brake lock member is engaged with the brake arm by the engaging portion and the locking portion is positioned between the bracket and the mounting bracket, a partition portion is provided which prevents a foot placed on the brake pedal pad from moving in the direction of an accelerator pedal provided next to the brake pedal.

4. The brake lock member is A brake lock device as described in claim 1 or 2, characterized in that it is provided with a depression preventing portion that prevents depression of an accelerator pedal provided next to the brake pedal when the brake lock member is engaged with the brake arm by the engaging portion and the locking portion is positioned between the bracket and the mounting bracket.

5. A drivable vehicle body; A working device provided on the vehicle body; a jack device capable of lifting and supporting the vehicle body; A work vehicle comprising the brake lock device according to claim 1.

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