Parking lock device for transport trolleys

Abstract

The objective of the present invention is to provide a parking lock device for a transport trolley that completely eliminates the possibility of fingers or other objects getting caught when releasing the parking lock of the transport trolley. [Solution] The present invention provides a parking lock device comprising: a trolley mounting member 10 attached to the body side of a transport trolley 200; a guide member 20 fixed to the trolley mounting member; a movable member 30 housed in the guide member so as to be slidable vertically and swingable horizontally; a grounding pad 42 swingably attached to the lower end of the movable member; an operating pedal 60 whose intermediate part is swingably attached to the movable member and which has a foot plate on one end; a contact member 70 attached to the other end of the operating pedal and which can contact the body side of the transport trolley; a biasing means 50 that constantly biases the movable member in the upward direction; and a pedal locking mechanism that locks the movable member in a swung state when the operating pedal is moving downward and the operating pedal is swung horizontally.

Description

Technical Field

[0001] The present invention relates to a parking lock device for a transport cart that is attached to a transport cart for carrying various transported items and is used when the transport cart is stopped at a predetermined position.

Background Art

[0002] Conventionally, various types of parking lock devices for transport carts have been developed. For example, there are those that fix the wheels of the transport cart with a lock brake, and those that are attached to the frame of the transport cart and project a stand part from the lock device main body to lift the frame from the ground to fix the transport cart. [[ID=1--4]]

[0003] <000001--4]] As a floor lock (parking lock device) that lifts and fixes the frame of the latter transport cart, for example, Patent Document 1 and Patent Document 2 are known. [<000001--4]] In the floor lock of Patent Document 1, when the lock release pedal is operated, even if a finger or an object enters under the lock release pedal, the lock release pedal does not cross with the springing-up lock pedal, and conversely, it is displaced upward against the biasing force. Therefore, there is no risk of pinching a finger or an object, and it can exhibit the effect of high safety. <00000——16]]

[0004] The floor lock described in Patent Document 2 consists of an extendable stand portion that is biased upward and has a plate-shaped support portion at its upper end; a roughly L-shaped lock pedal lever that is pivotally attached to the stand portion by a first pin and extends forward and backward beyond the stand portion, with a lock pin that can abut with the stand portion attached to its rear end and a step portion attached to its tip; a lock release pedal lever that is positioned outside alongside the lock pedal lever and whose rear end is pivotally attached to the back surface of the support portion by a second pin; and a link piece that is spanned and pivotally attached between the second pin and the lock pin. In the floor lock described in Patent Document 2, the stroke of the lock release pedal lever is reduced, and the lock pedal lever is formed in a roughly V-shape. This prevents the lock pedal lever from crossing the lock release pedal lever when it is operated, thus reducing the risk of fingers or objects being severely pinched when the lock is released. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2006-240504 [Patent Document 2] Japanese Patent Publication No. 2009-154630 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, since Patent Documents 1 and 2 have two levers, a locking lever and a lock release lever, there is a problem in that the risk of fingers or objects getting caught between the two levers, especially when operating the lock release lever, cannot be completely eliminated.

[0007] The present invention aims to provide a parking lock device for a transport trolley that completely eliminates the risk of fingers or objects getting caught when releasing the lock from a locked state after the transport trolley has been lifted and fixed off the ground. [Means for solving the problem]

[0008] The present invention relates to a parking lock device to be attached to a transport trolley, comprising: a trolley mounting member attached to the vehicle body side of the transport trolley; a guide member fixed to the trolley mounting member; a movable member attached to the guide member so as to be slidable vertically and swingable horizontally; a grounding pad swingably attached to the lower end of the movable member via a receiving seat; an operating pedal having a foot plate on one end and having its middle portion swingably attached to the movable member; a contact member attached to the other end of the operating pedal and capable of contacting the vehicle body side of the transport trolley; a biasing means for constantly biasing the movable member in the upward direction; and a pedal locking mechanism for locking the operating pedal in a swung state when the operating pedal is moving downward and the operating pedal is swung horizontally.

[0009] In the present invention, the trolley mounting member is composed of an L-shaped base plate having a horizontal side and a vertical side, and a guide groove for the operating pedal is formed on the vertical side. The pedal locking mechanism is composed of a pedal-side engaging portion provided on the operating pedal and a base plate-side engaging portion provided on the base plate, the base plate-side engaging portion is provided on the lower side of the guide groove of the base plate, and the base plate around the base plate-side engaging portion is cut out to form a space that allows lateral movement of the operating pedal.

[0010] In the present invention, it is preferable that the pedal-side engaging portion is composed of an engaging recess or protrusion provided on the operating pedal, and the base plate-side engaging portion is composed of an engaging protrusion or recess provided on the vertical side.

[0011] In the present invention, the guide member is composed of a cylindrical guide pipe of a predetermined length, and the movable member is composed of a cylindrical movable rod. The upper end of the guide pipe is fixed to the horizontal side of the base plate, and a vertical guide hole is formed on the side surface of the guide pipe. The movable rod is guided into the guide hole via a spindle pin protruding from the movable rod and is mounted on the guide pipe so as to be vertically slidable. Furthermore, it is preferable that a bulging hole portion is formed at least at the lower end of the guide hole to allow the spindle pin to swing horizontally.

[0012] In the present invention, it is preferable that the main shaft pin is configured as the pedal-side engaging portion of the pedal locking mechanism, and the bulging hole is configured as the base plate-side engaging portion of the pedal locking mechanism.

[0013] In the present invention, the operating pedal is preferably configured to include a flat pedal body having a foot plate at one end and two side plates connected to the other end of the pedal body, wherein the side plates are arranged to straddle the guide pipe, and a contact member is attached to the other end that straddles the guide pipe, and the tip of the main shaft pin is provided to protrude through the two side plates.

[0014] In the present invention, it is preferable that the L-shaped base plate has an extension side that extends downward from the tip of the horizontal side of the L, and that the lower end of the extension side has a contact side, and that the contact member can contact this contact side. [Effects of the Invention]

[0015] According to the present invention, a guide member is provided with a movable member that is slidable vertically and swingable horizontally, and the middle part of the operating pedal is swingably attached to this movable member. A pedal locking mechanism is provided that locks the movable member in a swung state when the operating pedal is moving downward and when the operating pedal is swung horizontally. As a result, the transport trolley can be lifted by operating the operating pedal vertically, and the operating pedal can be locked by operating it horizontally while the transport trolley is lifted using the pedal locking mechanism. On the other hand, the parking lock device can be unlocked simply by swinging the operating pedal horizontally in the opposite direction to the lock. In other words, since the parking lock and unlock of the transport trolley can be performed with just one operating pedal, a parking lock device can be provided that completely eliminates the risk of fingers or objects getting caught in the operating pedal. [Brief explanation of the drawing]

[0016] [Figure 1] Figure 1 is a partial cross-sectional front view showing one embodiment of the parking lock device for a transport trolley according to the present invention. [Figure 2] Figure 2 is a left side cross-sectional view of the base plate and guide pipe in the embodiment shown in Figure 1. [Figure 3] Figure 3 is a cross-sectional plan view showing a portion of the operating pedal and guide pipe in the embodiment of Figure 1. [Figure 4] Figure 4 is a front view showing the operating pedal of the embodiment shown in Figure 1. [Figure 5] Figure 5 is a cross-sectional right side view of the operating pedal section, showing the base plate and operating pedal of the embodiment shown in Figure 1. [Figure 6] Figures 6(A) and 6(B) show the operating states of the embodiment shown in Figure 1, with (A) being a partially cutaway front view showing the parking release state and (B) being the parking activation state. [Figure 7] Figures 7(A) and 7(B) show the normal and locked states of the operating pedal in the embodiment of Figure 1, with (A) being a plan view showing the normal state of the operating pedal and (B) being a plan view showing the locked state. [Figure 8] Figures 8(A), (B), and (C) show the positional states of the operation pedal with respect to the base plate of the embodiment of FIG. 1. (A) is a right side view showing the normal position of the operation pedal, (B) is the lowered end position, and (C) is the locked position. [Figure 9] FIG. 9 is a front view with a part cut away showing the state in which the parking lock device of the embodiment of FIG. 1 is applied to a road marking machine. [Figure 10] FIG. 10 is a right side view of FIG. 9. [Figure 11] FIG. 11 is a front view with a part sectioned showing another embodiment of the present invention.

Embodiments for Carrying out the Invention

[0017] Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 8. In FIGS. 1 and 2, the transport carriage 200 includes a vehicle body 211. A side frame 212 is provided on one side of the vehicle body 211, and wheels 214 are rotatably provided on the side frame 212 via axles 213. As an embodiment of the present invention, a parking lock device 1 is attached to the side frame 212 by a fixing member 215 composed of bolts and nuts.

[0018] The parking lock device 1 includes a base plate 10 as a carriage attachment member. The base plate 10 is formed by bending a plate material into an L-shape having a horizontal side 11 and a vertical side 12. The upper end of a guide pipe 20 as a guide member is fixed to the horizontal side 11. The guide pipe 20 is formed in a cylindrical shape with a predetermined length, and guide holes 21 are formed along the axial direction on the opposing side surfaces of the guide pipe 20 with a predetermined length. At the lower end of the guide hole 21, a bulging hole portion 22 having a width wider than the width of the guide hole 21 is formed, and a main shaft pin 31 described later can swing in the left-right direction, that is, in the lateral direction, or in the circumferential direction of the guide pipe 20 due to this bulging hole portion 22.

[0019] A movable rod 30, acting as a movable member, is housed and mounted within the guide pipe 20 so as to be slidable in the vertical direction, i.e., in the axial direction of the guide pipe 20, and also slidable in the horizontal direction, i.e., in the circumferential direction of the guide pipe 20. The movable rod 30 is formed in a cylindrical shape and is slightly shorter in length than the guide pipe 20. A main shaft pin 31 is inserted through the movable rod 30, with both ends protruding from it, as shown in Figure 2. A grounding pad 42 is pivotably attached to the lower end of the movable rod 30 via a spherical seat 41 that serves as a support. In this configuration, the spherical support seat 41 and the grounding pad 42 are integrally formed, and when the transport trolley 200 is lifted, the grounding pad 42 swings even if the ground is uneven, allowing the transport trolley 200 to be lifted safely. Such a mechanism can be used, for example, the "Leveling Adjuster" product name of Nabeya Biotech Co., Ltd., but is not limited to this product.

[0020] A spacer bush 32 is fitted over the portion of the spindle pin 31 that passes through the guide hole 21, allowing the spindle pin 31 to slide smoothly within the guide hole 21. Both ends of the spacer bush 32 that protrude from the guide pipe 20 protrude through through holes provided in the side plate 63 of the operating pedal 60, which will be described later. E-rings 33 are fitted to the spindle pin 31 at each outer position of the side plate 63 to prevent the spindle pin 31 from coming loose. In addition, spring grooves 34 are provided at both ends of the spindle pin 31.

[0021] Side ribs 23 are fixed to the upper sides of the guide pipe 20, where the guide holes 21 are provided, by welding or other means, so as to sandwich the guide pipe 20. The side ribs 23 are formed by bending a plate material into an L-shape when viewed from above. On the side surfaces of the side ribs 23, the parts that contact the inner surface of the vertical side 12 and the lower surface of the horizontal side 11 of the base plate 10 are fixed to the base plate 10 by welding or other means. A U-shaped spring hook 24 is formed at the bent tip of each of the pair of side ribs 23, which protrudes from the guide pipe 20. A tension coil spring 50, which serves as a biasing means, is stretched between this spring hook 24 and the spring hook groove 34 of the spindle pin 31. This tension coil spring 50 constantly biases the spindle pin 31 upward, and also biases the movable rod 30 upward, with the upper end of the movable rod 30 inserted near the lower surface of the horizontal side 11.

[0022] As shown in Figure 1, the middle section of the operating pedal 60 is pivotably attached to the main shaft pin 31 inserted through the movable rod 30. The operating pedal 60 comprises a pedal body 61 made of single plates arranged vertically, and a foot plate 62 is fixed to one end of the pedal body 61 by welding. One end of a pair of side plates 63 is attached to the other end of the pedal body 61 by a mounting member 64 made of bolts and nuts, so as to sandwich the pedal body 61. As mentioned above, the spindle pin 31 passes through the middle of the side plate 63, and the side plate 63, i.e., the operating pedal 60, is pivotably mounted relative to the spindle pin 31. In Figure 1, a contact member 70 is attached to the left end of the side plate 63 via a bracket 71 and a cotter pin 72. The bracket 71 is attached to the side plate 63 by a mounting fixture 73 consisting of bolts, nuts, etc. The upper surface of the contact member 70 is in contact with the lower surface of the axle 213. Therefore, when the pedal body 61 of the operating pedal 60 is pressed downward in Figure 1, the pedal body 61 rotates clockwise around the main shaft pin 31 against the tensile force of the tension coil spring 50, causing the movable rod 30 to move in the direction of protrusion from the guide pipe 20. At this time, since the grounding pad 42 is in contact with the ground, the contact member 70 acts to lift the axle 213, that is, the body 211 of the transport trolley 200, off the ground.

[0023] Figures 3 and 4 show the detailed structure of the operating pedal 60. As shown in Figure 4, the operating pedal 60 comprises a pedal body 61 with a shallow, angled side, and a recess 81 is formed on the upper left end of the pedal body 61 in Figures 3 and 4. Both sides of this recess 81 are held in place by the right end of the side plate 63. As a result, the recess 81 is formed in a concave shape surrounded by its periphery, and functions as the pedal-side engaging part of the pedal locking mechanism 80, which will be described later. As shown in Figure 3, the left side of the pair of side plates 63, beyond the clamping portion of the pedal body 61, is bent outward in a direction away from each other and arranged to surround the guide pipe 20. The left end of the side plate 63 is bent inward so as to overlap each other, forming a bent portion 65, and the bracket 71 of the contact member 70 is attached to this overlapping bent portion 65 by a mounting fixture 73.

[0024] Figure 5 shows a right side view of the base plate 10. A guide groove 13 for the operating pedal 60 is formed on the vertical side 12 of the base plate 10, extending from slightly above the center to the bottom end. On one side of the guide groove 13, the left vertical side 12 in the figure, a space 14 wider than the guide groove 13 is formed, and a protrusion 82 is formed at the upper end of the space 14. In this configuration, the space 14 functions as a movement space for the operating pedal 60 when it is pressed down and moved downward, and the protrusion 82 engages with the recess 81 of the operating pedal 60 to function as a pedal locking mechanism 80 that stops (locks) the operating pedal 60 in that position. Thus, the pedal locking mechanism 80 is formed by the recess 81 and the protrusion 82. In other words, the protrusion 82 functions as the base plate side engaging portion of the pedal locking mechanism 80.

[0025] The operation of this embodiment, configured as described above, will be explained with reference to Figures 6 to 8. Figure 6(A) shows the parking brake released state, and (B) shows the parking brake engaged state. In Figure 6(A), the wheels 214 of the transport trolley 200 are in contact with the ground, and the operating pedal 60 is not pressed down, so the ground contact pads 42 are lifted off the ground, and the transport trolley 200 is in a state where it can transport. In other words, the main spindle pin 31 attached to the movable rod 30 is pulled upward by the tension coil spring 50, and the movable rod 30 is retracted into the guide pipe 20. In this figure, the wheels 214 are in contact with the ground due to the weight of the transport trolley 200. As a result, the axle 213 pushes the contact member 70 downward, and the operating pedal 60 rotates counterclockwise around the main spindle pin 31, stopping with the upper edge of the operating pedal 60 in contact with the upper end of the guide groove 13 of the vertical edge 12.

[0026] Next, as shown in Figure 6(B), when the foot plate 62 of the operating pedal 60 is pressed downward, the operating pedal 60 rotates clockwise around the main shaft pin 31. At this time, since the contact member 70 is in contact with the lower surface of the axle 213, at the beginning of pressing, the movable rod 30 moves downward together with the main shaft pin 31 against the tensile force of the tension coil spring 50. Next, once the movable rod 30 has descended to a certain extent and the grounding pad 42 has made contact with the ground, the movable rod 30 cannot descend any further, so the axle 213 is lifted by the contact member 70, and the wheels 214 of the transport trolley 200 are lifted off the ground, that is, in a state where parking is possible.

[0027] Next, the parking lock state, which maintains the parking position, will be explained with reference to Figures 7 and 8. Figures 7(A) and 7(B) show the normal state and locked state of the operating pedal 60 in this embodiment, where (A) shows the normal state of the operating pedal 60 and (B) shows the locked state. Figures 8(A), (B), and (C) show the positional states of the operating pedal 60 relative to the base plate 10 in this embodiment, where (A) is the normal position of the operating pedal 60, (B) is the lowered end position, and (C) is the locked position.

[0028] Figures 7(A) and 8(A) show the state in which the operating pedal 60 of the parking lock device 1 is not pressed, and normal transport operations can be performed. In these figures, the operating pedal 60 is positioned parallel to the direction of travel of the transport trolley 200, and the operating pedal 60 is stopped at its upper end within the guide groove 13 of the base plate 10.

[0029] Figure 8(B) shows the lowest position of the operating pedal 60 after it has been pressed down from the normal state, and corresponds to the pressed position as shown by the dashed line in Figure 6(B). In this state, the operating pedal 60 is not rotated laterally, and the space 14 on the vertical side 12 is open.

[0030] From the state shown in Figures 7(A) and 8(B), if the operating pedal 60 is rotated clockwise while the foot plate 62 of the operating pedal 60 is pressed down, as shown in Figure 7(B), and the pressure is released, the operating pedal 60 will rise due to the spring force of the tension coil spring 50 and the weight of the transport trolley 200, and as shown in Figure 8(C), the recess 81 of the pedal locking mechanism 80 will engage with the protrusion 82, putting it into a parking lock state.

[0031] To release the lock from the state shown in Figure 8(C), press down on the operating pedal 60 again, then move the operating pedal 60 counterclockwise (opposite to the locking operation), release the pressure, and raise the operating pedal 60 along the guide groove 13. When the operating pedal 60 is released, the contact member 70 at the left end of the operating pedal 60 lowers, causing the axle 213 that the contact member 70 is in contact with to also lower, allowing the wheel 214 to touch the ground and return to a normal transportable state.

[0032] According to the embodiment described above, the following effects are obtained. According to this embodiment, the parking lock operation and release operation of the transport trolley 200 can be performed by operating a single operating pedal 60. Therefore, unlike the conventional method which uses two pedals, there is no risk of fingers or objects getting caught in the operating pedal 60, resulting in an extremely safe unlocking operation. Furthermore, according to this embodiment, since there is only one operating pedal 60, the structure is simplified, costs can be reduced, and the product can be offered at a low price.

[0033] According to this embodiment, the pedal locking mechanism 80 is composed of a recess 81 provided on the operating pedal 60 and a protrusion 82 provided on the base plate 10, so its structure is extremely simple and can be provided at a low cost. Furthermore, the locking and unlocking operations of the pedal locking mechanism 80 are also simple, as they only require a slight lateral rotation of the operating pedal 60 when it is pressed down.

[0034] According to this embodiment, all components such as the guide pipe 20, movable rod 30, operating pedal 60, and pedal locking mechanism 80 are mounted on the base plate 10, making it compact. Furthermore, the attachment of the parking lock device 1 to the transport trolley 200 is simple, not only because the parking lock device 1 is compact, but also because the base plate 10 only needs to be attached with fixing members 215 such as bolts. This makes it applicable to many models of transport trolleys 200.

[0035] Figures 9 and 10 show embodiments in which the embodiment of Figure 1 is applied to a road marking machine 210 as a transport trolley. In this embodiment applied to the road marking machine 210, the same reference numerals are used for components that are the same as or equivalent to those in the previous embodiment, and their descriptions are omitted or simplified. In Figures 9 and 10, the road marking machine 210 is equipped with a body 211, and in Figure 9, a side frame 212 is provided at the right end of the body 211. In addition, a total of four wheels 214 are rotatably mounted on the front, rear, left, and right sides of the body 211 via axles 213.

[0036] On the vehicle body 211, from left to right in Figure 9, are mounted a bead tank 221, a paint melting tank 222, and an LPG cylinder 223. Furthermore, the lower part of the vehicle body 211 is provided with a burner 225 for melting paint and an opening / closing shutter 226 for applying and stopping the paint. Furthermore, the vehicle body 211 is provided with a coating operation lever 228 for operating the opening and closing shutter 226, as well as a steering handle 229 for moving the road marking machine 210, allowing the road marking machine 210 to be moved to a desired position by operating the steering handle 229.

[0037] In Figure 9, the rightmost part of the vehicle body 211 of the road marking machine 210 shows that the parking lock device 1 according to this embodiment is attached to the side frame 212 of the vehicle body 211. The parking lock device 1 has its base plate 10 attached to the side frame 212 by a fixing member 215. A movable rod 30 is housed inside a guide pipe 20, whose upper end is fixed to a base plate 10. A main shaft pin 31 protruding from the movable rod 30 is rotatably supported in the middle of an operating pedal 60, which has a foot plate 62 at one end, and a contact member 70 provided at the other end of the operating pedal 60 is in contact with the lower surface of the axle 213 of the vehicle body 211.

[0038] In this embodiment, as configured, by pressing the operating pedal 60 of the parking lock device 1 downwards and then rotating it laterally, even the extremely heavy road marking machine 210 can be easily lifted and locked in that position. Furthermore, in this embodiment as well, the operation and effects of the embodiment described in Figure 1 and subsequent figures can be achieved in the same manner.

[0039] Figure 11 is a partial cross-sectional front view illustrating another embodiment of the present invention. In these other embodiments as well, the same reference numerals are used for components that are the same as or equivalent to those in the previous embodiments, and their descriptions are omitted or simplified.

[0040] In this other embodiment, the contact member 70 provided at the other end of the operating pedal 60 does not contact the axle 213 of the vehicle body 211, as in the embodiment described in Figure 1 and below, but rather a part of the base plate 10 is extended and the contact member 70 contacts this extended portion. In other words, as shown in Figure 11, the L-shaped base plate 10 of this embodiment has an extension side 15 extending downward from the tip of the horizontal side 11, and a horizontal contact side 16 is integrally provided at the lower end of the extension side 15. The contact edge 16 is made capable of contacting the contact member 70 provided at the other end of the operating pedal 60.

[0041] In other embodiments configured in this manner, when the foot plate 62 of the operating pedal 60 is pressed down, the operating pedal 60 rotates clockwise around the main shaft pin 31 as a pivot, and the contact member 70 provided at the other end of the operating pedal 60 comes into contact with the contact edge 16 of the base plate 10, lifting the contact edge 16. The upward movement of the contact edge 16 is transmitted to the side frame 212 of the vehicle body 211 via the base plate 10 which is integrated with the contact edge 16, causing the vehicle body 211 to be lifted.

[0042] These other embodiments also have the same effects and advantages as the embodiments shown in Figure 1 and subsequent figures. In addition, in this other embodiment, the effect can be added that the movement of the contact member 70 can be reliably transmitted to the vehicle body 211 regardless of the position of the axle or other components of the transport trolley 200. Thus, in this other embodiment, as mentioned above, the parking lock device 1 is self-contained, so there is no need to choose a specific type of transport trolley 200, which has the effect of being more versatile.

[0043] Although embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration of the present invention is not limited to these embodiments, and any design changes or other modifications that do not depart from the spirit of the present invention are also included.

[0044] For example, the contact portion of the contact member 70 on the vehicle body 211 side is not limited to the axle 213, but may also be a part of the vehicle body 211, or a member integrally provided with the base plate 10, which is a bogie mounting member. In short, it is sufficient that the contact member 70 contacts a part that operates integrally with the vehicle body 211 side. Furthermore, the movable rod 30 as a movable member and the guide pipe 20 as a guide member may have opposite orientations, that is, the movable rod 30 may be cylindrical and the guide pipe 20 may be axial. Moreover, they do not necessarily have to be axial and cylindrical; they may be plate-shaped, block-shaped, or other shapes. In short, any shape that allows them to be mounted so that they can slide vertically and swing horizontally is acceptable.

[0045] Furthermore, the pedal locking mechanism 80 does not necessarily have to consist of a recess 81 provided on the operating pedal 60 and a protrusion 82 provided on the base plate 10, and the recess and protrusion may be reversed. Moreover, the pedal locking mechanism 80 is not limited to being provided between the operating pedal 60 and the base plate 10, but may also be a type of bayonet mechanism provided between the guide member 20 and the movable member 30. Specifically, the main shaft pin 31 may be provided so as to be able to lock into the bulging hole 22 of the guide hole 21.

[0046] Furthermore, the base plate 10 may be attached to the vehicle body 211 not only on the vertical side 12, but also on other parts such as the horizontal side 11. Furthermore, the tension coil spring 50 as a biasing means is a different type of spring or biasing means. But that's fine too; for example, a leaf spring or a gas spring would also work. Furthermore, the spherical support seat 41, which serves as the support seat, does not necessarily have to have a spherical surface; in short, it is sufficient if it is a structure that can swingly support the movable rod 30, which serves as the movable member, when the grounding pad 42 is in contact with the ground. [Explanation of symbols]

[0047] 1…Parking lock device 10…Base plate as a mounting component for the trolley 11…Horizontal side 12…Perpendicular side 13… Guide groove 14…Space part 15... Extended side 16…Abutting side 20... Guide pipe as a guide member 21… Guide hole 22...Bulging hole part 23…Side Ribs 24... Spring hanger 30…Movable rod as a movable component 31… Main spindle pin 32... Spacer bush 33…E-ring 34... Spring mounting groove 41...Spherical seat as a seat 42... Grounding pads 50...Tension coil spring as a biasing means 60...Operation pedals 61...Pedal body 62... treads 63... Side Plate 64…Mounting parts 65...Bending part 70... Contact member 71…Bracket 72... Cotter pin 73…Mounting hardware 80...Pedal locking mechanism 81... Recess as the pedal-side engagement part 82...Protrusion as engagement part on the base plate side 200... Transport cart 210...Road marking machine 211... Vehicle body 212... Side frame 213... Axle 214...Wheel 215... Fixing member 221... Bead Tank 222... Paint melting tank 223...LPG cylinder 225... Burner 226... Opening and closing shutter 228... Dispensing operation lever 229... Operating handle

Claims

1. A parking lock device that can be attached to a transport trolley, A trolley mounting member attached to the vehicle body side of the transport trolley, A guide member fixed to the aforementioned trolley mounting member, A movable member is attached to the guide member so as to be slidable in the vertical direction and swingable in the horizontal direction, A grounding pad is pivotably attached to the lower end of the movable member via a support seat, An operating pedal is attached to the aforementioned movable member so as to be pivotable in the middle and has a foot plate on one end, A contact member is attached to the other end of the aforementioned operating pedal and is capable of contacting the vehicle body side of the transport trolley, A biasing means that constantly biases the movable member in the upward direction, A pedal locking mechanism that locks the operating pedal in a rotated position when the operating pedal is moved downward and rotated in the left-right direction, A parking lock device is provided.

2. A parking lock device according to claim 1, wherein the trolley mounting member is composed of an L-shaped base plate having a horizontal side and a vertical side, and a guide groove for an operating pedal is formed in the vertical side, and the pedal locking mechanism is composed of a pedal-side engaging portion provided on the operating pedal and a base plate-side engaging portion provided on the base plate, the base plate-side engaging portion is provided on the lower side of the guide groove of the base plate, and the base plate around the base plate-side engaging portion is cut out to form a space that allows lateral movement of the operating pedal.

3. A parking lock device according to claim 2, wherein the pedal-side engaging portion is composed of an engaging recess or protrusion provided on the operating pedal, and the base plate-side engaging portion is composed of an engaging protrusion or recess provided on the vertical side.

4. A parking lock device according to claim 2, wherein the guide member is composed of a cylindrical guide pipe of a predetermined length, the movable member is composed of a cylindrical movable rod, the upper end of the guide pipe is fixed to the horizontal side of the base plate, a vertical guide hole is formed on the side surface of the guide pipe, the movable rod is guided into the guide hole via a spindle pin protruding from the movable rod and is mounted on the guide pipe so as to be vertically slidable, and furthermore, a bulging hole portion is formed at least at the lower end of the guide hole to allow the spindle pin to swing in the left-right direction.

5. A parking lock device according to claim 4, wherein the main shaft pin is configured as the pedal-side engaging portion of the pedal locking mechanism, and the bulging hole is configured as the base plate-side engaging portion of the pedal locking mechanism.

6. A parking lock device according to claim 4, wherein the operating pedal comprises a flat pedal body having a foot plate on one end and two side plates connected to the other end of the pedal body, the side plates are arranged to straddle the guide pipe and the contact member is attached to the other end that straddles the guide pipe, and the tip of the main shaft pin is provided to protrude through the two side plates.

7. A parking lock device according to claim 2, wherein the L-shaped base plate has an extension side that extends downward from the tip of the horizontal side of the L, and the lower end of the extension side has a contact side, and the contact member is made capable of contacting the contact side.

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