JP2018167803A - Brake device for cargo handling transport vehicle - Google Patents

Abstract

To enable operation of a brake device with a stepping-in action of a foot in addition to a tilting operation of a steering wheel and also facilitate a braking lock.SOLUTION: A brake device 4 for a cargo handling transport vehicle comprises a loading table 21 liftably supported on a traveling moving wheel 34 via a hydraulic cylinder 37, a hydraulic pump 36 for supplying oil pressure to the hydraulic cylinder 37, a brake body 60 that can break the traveling moving wheel 34 by bringing a brake shoe 63 into pressure contact with the traveling moving wheel 34, a rocking arm 46 for moving the brake body 60 in the braking direction, and an operation unit 5 for enabling push/pull operation for longitudinally moving the loading space 21, actuation operation of the hydraulic pump and braking operation by rotation of the rocking arm 46. The rocking arm 46 is arranged in a rear lower part of the operation part 5, and a brake pedal 47 is provided in a lower part of the rocking arm 46.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a brake device for a luggage carrier, and more particularly to a technology of a brake device provided below a handle of a pallet lift truck.

  Conventionally, in a pallet lift truck provided with a fork-type cargo bed having a front moving wheel at the front end, a hydraulic cylinder that supports the base end of the cargo bed and raises and lowers it, and a rear moving wheel that supports the hydraulic cylinder, A technique is known in which a brake operation member that applies a brake shoe to a wheel to apply a brake is provided, and the brake operation member can be braked by a handle lowering operation. For example, it is a technique shown in Patent Document 1.

Japanese Patent No. 2981841

In the technique shown in Patent Document 1, since the brake can be braked only by a handle lowering operation, the brake is required to have a space that allows the handle to be tilted backward. In other words, braking was not possible in a narrow space. Also, in order to maintain the braked state like a parking brake, it was configured to maintain the braking state by operating the lock lever, but with the handle lowered, the lock lever arranged on the handle base side can be Since it was necessary to operate, the distance between the handle tip and the lock lever was long and it was difficult to operate.
Therefore, the brake device can be braked not only by tilting the handle but also by stepping on the foot, and the brake can be easily locked (parking brake).

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
That is, according to the first aspect of the present invention, it is possible to perform braking by bringing a loading platform that is supported by a traveling moving wheel through a hydraulic cylinder so as to be movable up and down, a hydraulic pump that supplies hydraulic pressure to the hydraulic cylinder, and a brake shoe being pressed against the traveling moving wheel A brake body, a swing arm that moves the brake body in the braking direction, a push-pull operation for moving the loading platform back and forth, an operation operation of the hydraulic pump, and a braking operation by turning the swing arm In the brake device for a cargo handling vehicle including the operation unit to be operated, the swing arm is disposed below and below the operation unit, and a brake operation unit is provided below the swing arm.

  According to a second aspect of the present invention, a guard member having a semicircular shape in plan view for preventing a foot from entering the traveling moving wheel is attached to the swing arm so as to extend rearward in the left and right directions.

  According to a third aspect of the present invention, a parking brake is disposed between the brake body and the swing arm, and the parking brake operating means of the parking brake is disposed on the inner side of the outer periphery of the guard member. .

As effects of the present invention, the following effects can be obtained.
In other words, the brake operation means is arranged below the operation portion, and it becomes possible to brake not only by a hand but also by a stepping operation with a foot, so that the operability can be improved. In addition, the braking operation can be performed in the vicinity of the parking brake, and the operability can be further improved in addition to the improvement in safety.

The side view which shows the whole structure of a cargo handling vehicle provided with the brake device of this invention. FIG. The rear view of a brake device and a raising / lowering device. The side view of a brake device and a raising / lowering apparatus. The top view of a brake device. (A) The top view of the brake body and parking brake at the time of non-braking, (b) The top view of the brake body and parking brake at the time of parking brake braking.

Below, with reference to FIG.1, FIG.2, FIG.3 and FIG. 4, the whole structure of the pallet lift truck 1 is demonstrated as a cargo handling vehicle.
In the following description, it is assumed that the direction of the arrow F shown in FIG.

  The pallet lift truck 1 includes a load placement unit 2 on which a load is placed, an operation unit 5 in which an operator performs a steering transport operation and a lifting operation, a lift device 3 that lifts and lowers the load placement unit 2, and a brake device that brakes the load. It consists of four.

  The luggage placing portion 2 is inserted into the side space of the pallet on which the luggage is placed and lifted. The baggage placing portion 2 is disposed in the fork-like loading platforms 21 and 21 that are parallel to the left and right and extend in the front-rear direction, and the front traveling wheels 22 and 22 that are disposed in front and lower portions of the left and right loading platforms 21 and 21 and can be raised and lowered. And a base body 23 that extends obliquely upward and rearward from the rear part of the loading platforms 21 and 21 and is connected to the lifting device 3.

  The loading platform 21 has an upper surface as a pallet mounting surface. Since the loading platform 21 is configured symmetrically, only one of the left and right sides will be described. One end of an arm 24 is supported at the front part of the loading platform 21 so as to be rotatable up and down, and is stored in the loading platform 21. A traveling front wheel 22 is rotatably supported at the other end of the arm 24. One end of a connecting rod 25 is pivoted to one side of the arm 24, and the connecting rod 25 is housed in the loading platform 21 and extends rearward. The other end of the connecting rod 25 is connected to one end of the lifting arm 26. The elevating arm 26 is configured as a bell crank ("<") shape when viewed from the side, and the front and rear central portions are rotatably supported by a support shaft 27 horizontally mounted on the base body 23. The other end of the lifting arm 26 is pivotally supported by a bearing body 31 of the lifting device 3 described later.

  The base body 23 is configured in a box shape having a substantially triangular shape when viewed from the front, and is disposed so as to incline from front to back and rear to high. The rear ends of the loading platforms 21 and 21 are fixed to the lower surfaces of the left and right sides of the base body 23, and a support shaft 27 that pivotally supports the elevating arm 26 is provided horizontally on the upper end. A lifting device connecting portion 28 extends rearward from the upper left and right center ends of the base body 23.

  As shown in FIG. 4, the elevating device 3 includes a hydraulic base 35 provided with a switching valve, a relief valve, and an oil passage, a hydraulic cylinder 37 that is fixed to the front of the hydraulic base 35 in the vertical direction, A traveling wheel 34 that is rotatably supported by an axle 30 that is horizontally provided at the lower end of a main longitudinal axis 39 provided below the cylinder 37, and a bearing body 31 that is rotatably supported on the upper outer periphery of the main longitudinal axis 39. An oil tank 33 provided on the outer periphery of the hydraulic cylinder 37 on the hydraulic base 35, a hydraulic pump 36 provided on the rear portion of the hydraulic base 35, a plunger piston 38 for pressurizing the hydraulic pump 36, and the like.

  The traveling moving wheel 34 is integrally connected to the hydraulic base 35 and the operation unit 5, and the traveling moving wheel 34 is rotated left and right in conjunction with the left and right rotation of the handle 51 of the operation unit 5. In this embodiment, it can be rotated to the left and right by about 180 degrees.

  The operation unit 5 includes a handle base bracket 54 fixed to the rear part of the oil tank 33, a handle base 55 connected to the upper part of the plunger piston 38 and the rear part of the handle base bracket 54, and an upper part of the handle base 55. A handle 51 fixed to the handle 51, a grip 52 provided on the upper portion of the handle 51, and a lift switching lever 53 disposed along the grip 52.

  The grip 52 is formed in a rectangular loop shape that is substantially horizontally long when viewed from the front, and an elevation switching lever 53 is provided at the center thereof. The raising / lowering switching lever 53 is connected to an operation portion of a switching valve provided in the hydraulic base 35, and the hydraulic oil is supplied to the hydraulic cylinder 37 by the operation of the raising / lowering switching lever 53 and the relief from the hydraulic cylinder 37 to the oil tank 33. Can be switched. However, the shape of the grip 53 is not limited, and may be an elliptical shape or a horizontal bar.

  In such a configuration, when the raising / lowering switching lever 53 is switched to the raised position and the handle 51 is turned up and down, the plunger piston 38 is raised and lowered, and the pressure oil from the hydraulic pump 36 to the hydraulic cylinder 37 via the switching valve. The oil is fed and the hydraulic cylinder 37 is extended. By this extension, the lifting device connecting portion 28 and the base body 23 at the rear portion of the loading platform 21 are lifted. As the base body 23 is raised, the support shaft 27 is raised, the elevating arm 26 is rotated, the connecting rod 25 is pushed forward, the arm 24 is rotated, and the traveling front wheel 22 moves downward. As a result, the rear part and the front part of the loading platform 21 are lifted, and the load can be lifted. When the grip 52 is pulled or pushed in the lifted state, the traveling front wheel 22 and the traveling moving wheel 34 roll, and the pallet lift truck 1 can carry the load. When the elevating switching lever 39 is switched to the lowered position after the movement, the switching valve is switched, the pressure oil is returned to the oil tank 33, the hydraulic cylinder 37 is reduced, and the loading platform 21 is lowered by its own weight.

  As shown in FIGS. 4, 5, and 6, the brake device 4 is slidable on the brake shaft 40, and a brake shaft 40 that protrudes rearward from the lower portion of the main longitudinal axis 39 to which the axle 30 is attached. A brake body 60, a parking brake 70, springs 43 and 44, a support arm 45 projecting rearward from the middle part of the main longitudinal axis 39, and a swing attached to the rear part of the support arm 45. A moving arm 46, a brake pedal 47 serving as a brake operating means disposed at a lower portion of the swing arm 46, a guard member 48, and a contact member 80 attached to the upper portion of the swing arm 46 are provided.

  The main vertical axis 39 is suspended downward from the hydraulic base 35, and the bearing body 31 is rotatably fitted on the upper part. It can be rotated together with the moving wheel 34.

  The brake body 60 includes a left and right central boss portion 61, a cam portion 62 formed on the rear surface of the boss portion 61, and brake shoes 63 and 63 projecting laterally from both left and right sides of the boss portion 61. The boss portion 61 is fitted on the brake shaft 40 so as to be slidable in the axial direction and not rotatable. That is, the cross-sectional shape of the through-hole formed in the shaft center of the boss portion 61 and the brake shaft 40 is configured by a polygon such as a quadrangle or a hexagon, a spline, or a serration. On the other hand, it can slide in the axial direction (front-rear direction) but cannot rotate. A spring 43 is externally fitted as an urging member on the brake shaft 40 between the boss portion 61 and the main longitudinal axis 39 to urge the brake body 60 to slide backward.

  The cam portion 62 has a cam profile formed on the rear surface of the boss portion 62 and can be engaged with a cam portion 72 formed on a parking brake 70 described later. The cam profile is a convex trapezoidal shape and has a hypotenuse part 62a and a flat part 62b.

  The brake shoe 63 is disposed behind the outer periphery of the traveling wheel 34 so that it can be braked by being pressed against the outer periphery of the traveling wheel 34. A member capable of increasing the frictional force between the brake shoe 63 and the outer peripheral surface of the traveling moving wheel 34 is attached and can be replaced. The brake shoe 63 is urged away from the outer peripheral surface of the traveling wheel 34 by the urging force of the spring 43, and is not normally braked.

  The parking brake 70 includes a boss portion 71 at the center on the left and right sides, a cam portion 72 formed on the front surface of the boss portion 71 so as to face the cam portion 62, and a parking projecting laterally from the left and right sides of the boss portion 71. It consists of parking brake pedals 73 and 73 as brake operation means. The boss 71 is supported so as to be slidable and rotatable with respect to the brake shaft 40. A spring 44 as an urging member is externally fitted on the brake shaft 40 between the rear surface of the boss portion 71 and the front surface of the swing arm 46 to attach the swing arm 46 rearward (clockwise in FIG. 4). It is fast. A space corresponding to the length of the stroke for braking is formed between the rear end of the brake shaft 40 and the front surface of the swing arm 46.

A cam profile is formed on the front surface of the boss portion 72 so that the cam portion 72 engages with the cam portion 62. The cam profile has a concave shape, and has an oblique side portion 72a and a front plane portion 72b. In the non-actuated state, the hypotenuse part 72 a is in contact with the hypotenuse part 62 a of the cam part 62 at the surface, and the flat part 62 b of the brake body 60 is fitted in the recess of the boss part 71.
The parking brake pedals 73 and 73 can be stepped on with the operator's feet, and the parking brake pedals 73 and 73 protrude inside a space formed by a guard member 48 described later. One of the left and right parking brake pedals 73 is for locking, and the other is for unlocking.

  In such a configuration, when the parking brake pedal 73 on the lock side (right side in the present embodiment) is depressed, the boss portion 71 of the parking brake 70 is rotated, and the oblique side portion 72a of the cam portion 72 is the cam portion 62 of the brake body 60. The brake body 60 is slid forward, and the brake shoe 63 is pressed against the outer peripheral surface of the traveling wheel 34 as shown in FIG. The part 72b and the flat part 62b of the brake body 60 are rotated to a position where they contact each other. At this position, the sliding stops, the brake shoe 63 comes into pressure contact with the outer peripheral surface of the traveling wheel 34, the parking brake 70 is applied, and this state is maintained.

  When the parking brake pedal 73 on the unlocking side (left side in the present embodiment) is depressed to release the parking brake 70, the boss 71 of the parking brake 70 is rotated in the opposite direction to the above and the springs 43 and 44 are attached. The force is applied, and the oblique side portion 72a of the cam portion 72 slides on the oblique side portion 62a of the cam portion 62 of the brake body 60 to return to the original engaged state as shown in FIG. Is separated from the outer peripheral surface of the traveling wheel 34, and braking is released.

  Further, the upper and lower middle portions of the swing arm 46 are pivotally supported at the rear end of the support arm 45 via the pivot shaft 41 so as to be pivotable forward and backward. The swing arm 46 includes an upper support rod 46a having an L shape in side view and a lower support rod 46b projecting downward from the lower portion of the upper support rod 46a. The lower front end of the upper support rod 46 a is pivotally supported by the pivot shaft 41 at the rear end of the support arm 45. A brake pedal 47 as a brake operation means and a guard member 48 having a semicircular shape in plan view are attached to the lower end of the lower support rod 46b.

  The brake pedal 47 projects rearward and downward from the lower end of the lower support rod 46 b, and the rear end of the brake pedal 47 is fixed to the rear part of the left and right center of the guard member 48. In other words, the brake pedal 47 also serves as a connecting member between the swing arm 46 and the rear side of the guard member 48 to suppress an increase in the number of parts. The brake pedal 47 is located at the lower rear of the operation unit 5 and is disposed at the center of the left and right behind the traveling moving wheel 34. The brake pedal 47 is configured to have a rearward downward slope so that it can be easily stepped on with the right or left foot. Further, even when the brake pedal 47 is stepped off, the guard member 48 can be stepped on and the braking operation can be performed so that the braking operation can be performed reliably, thereby improving safety. In addition, the operation range of the brake operation is expanded by the guard member 48. The front surface of the middle portion of the lower support rod 46b is in contact with the rear surface of the spring 44, and can be interlocked with the brake body 60 via the spring 44 and the parking brake 70.

  That is, when the brake pedal 47 is stepped on, the swing arm 46 rotates about the pivot shaft 41, and the lower support rod 46b rotates forward to disengage the brake body 60 via the spring 44 and the parking brake 70. The brake shoes 63 and 63 are slid forward, and the brake shoes 63 and 63 are pressed against the outer peripheral rear surface of the traveling moving wheel 34 to be braked. When the stepping of the foot is released, the original non-braking state is restored by the urging force of the springs 43 and 44.

  The guard member 48 includes an arc portion 48a, a string portion 48b, and a connecting member 48c, and prevents the operator's feet from entering the lower portion of the traveling wheel 34 from behind the traveling wheel 34. That is, the arc portion 48a is formed by bending a rod in a semicircular shape centering around the intersection of a line connecting the longitudinal axis of the brake shaft 40 and the rear ends of the left and right traveling wheels 34, and The front part is fixed to the left and right rear surfaces of the string part 48b, and the arc part 48a extends horizontally from the lower end of the swing arm 46 to the rear and the left and right sides to form a semicircular guard space. ing. The left and right centers of the arc part 48a are fixed to the rear part of the brake pedal 47 and are arranged in a substantially horizontal direction. In other words, the guard member 48 is disposed in a state of being lifted from the ground surface by a predetermined height (to the extent that a foot does not enter).

  The string portion 48 b is made of a plate and is disposed below the brake body 60. The string portion 48b is horizontally provided in the horizontal direction with the front end of the connecting member 48c fixed to the left and right center rear surfaces, and the rear end of the connecting member 48c is fixed to the lower end of the lower support rod 46b. The left and right widths of the string portion 48b are made to coincide with the left and right outermost widths of the left and right traveling wheels 34 and 34. The left and right sides of the arc portion 48a are fixed to the rear surfaces of the left and right sides of the string portion 48b.

  With this configuration, even when the operator's foot is located behind the traveling moving wheel 34 during the transporting operation, the guard member 48 can not be brought close to the traveling moving wheel 34 and the operator's foot It is possible to prevent the traveling wheel 34 from being caught. Further, since the guard member 48 and the brake pedal 47 are connected, it is possible to brake by stepping on the guard member 48 even when the foot does not reach the brake pedal 47, and the braking operability is improved. It was possible. Further, since the guard member 48 has a semicircular shape, there is no convex portion behind the traveling wheel 34 and the foot is caught even when the handle 51 is rotated during transportation or steering. There is no such thing. In addition, parking brake pedals 73 and 73 are disposed in a guard space formed by the guard member 48 in plan view.

  Further, a contact member 80 is provided at the upper end of the upper support rod 46a of the swing arm 46, and when the brake 51 is braked by the lowering operation of the handle 51, the swing arm 46 can be smoothly rotated and braked. I am doing so. That is, the abutting member 80 has a roller shaft 81 mounted horizontally on the upper end in the left-right direction, and a roller 82 is rotatably supported on the roller shaft 81.

  With this configuration, when carrying out the transportation work while pulling with the grip 52 of the operation unit 5, when the movement of the pallet lift truck 1 is to be stopped, the handle 51 is tilted rearward and downward (rotation). Brake). At this time, the rear surface of the handle base 55 comes into contact with the roller 82 and the upper part of the swing arm 46 is tilted backward, and the lower support rod 46b slides the brake body 60 forward via the spring 44 and the parking brake 70. Thus, the brake shoes 63 and 63 can be pressed against the rear surface of the traveling wheel 34 for braking. When the handle 51 is tilted rearward, the handle base 55 can be tilted by the roller 82 without the upper end of the swing arm 46 being caught, and can be smoothly braked.

  As described above, the loading platform 21 that is supported by the traveling moving wheel 34 via the hydraulic cylinder 37 so as to be raised and lowered, the hydraulic pump 36 that supplies hydraulic pressure to the hydraulic cylinder 37, and the brake shoe 63 is pressed against the traveling moving wheel 34. The brake body 60 that can be braked, the swing arm 46 that moves the brake body 60 in the braking direction, the push-pull operation for moving the loading platform 21 back and forth, the operation operation of the hydraulic pump 39, and the swing arm 46 In the brake device 4 for a cargo handling vehicle including an operation unit 5 that enables a braking operation by turning the swinging arm, the swing arm 46 is disposed below and below the control unit 5. Since the brake pedal 47 is provided as a brake operating means, the brake pedal 47 is disposed below the operation unit 5 and is not only depressed by hand but also by foot. Also able to brake by the operation, the brake pedal 47 to a position in the left-right center, left and right can also be operated by either the foot, it began to be improved brake operability.

  Further, a guard member 48 having a semicircular shape in plan view that prevents the intrusion of the foot into the traveling moving wheel 34 is attached to the swing arm 46 so as to extend horizontally in the left and right rear directions. At the time of steering / transporting operation, the guard member 48 can prevent the foot from entering the lower side of the traveling wheel 34, and can also be prevented from being caught by the guard member 48 and the members disposed inside the guard member 48. Brake operation can be performed by stepping on 48, the brake operation range can be expanded, and the operability can be further improved in addition to the improvement in safety.

  Further, a parking brake 70 is disposed between the brake body 60 and the swing arm 46, and a parking brake pedal 73 as a parking brake operating means of the parking brake 70 is located inside the outer periphery of the guard member 48. Therefore, the parking brake 70 can be operated in the vicinity of the brake pedal 47, which can be performed by a stepping operation with a foot, and the operability of the parking brake can be improved. Further, since the parking brake pedal 73 is located inside the guard member 48, the parking brake pedal 73 does not interfere with the braking operation and the steering operation, and the parking brake 70 can use the brake device 4, so that the number of parts can be reduced. Therefore, it can be configured at low cost. Further, even when there is an obstacle or the like when moving rearward, the guard member 48 hits the obstacle or the like, and the parking brake 70 or the like is protected by the guard member 48.

DESCRIPTION OF SYMBOLS 1 Pallet lift truck 4 Brake device 5 Operation part 21 Loading platform 34 Traveling moving wheel 36 Hydraulic pump 37 Hydraulic cylinder 46 Swing arm 47 Brake pedal 48 Guard member 60 Brake body 63 Brake shoe 70 Parking brake 73 Parking brake pedal

  The present invention relates to a brake device for a luggage carrier, and more particularly to a technology of a brake device provided below a handle of a pallet lift truck.

  Conventionally, in a pallet lift truck provided with a fork-type cargo bed provided with a front moving wheel at the front end, a hydraulic cylinder that supports the base end of the cargo bed and lifts it, and a rear moving wheel that supports the hydraulic cylinder, There is a known technique in which a brake operation member that applies a brake shoe to a moving wheel to apply a brake is provided, and the brake operation member can be braked by a handle lowering operation. For example, it is a technique shown in Patent Document 1.

Japanese Patent No. 2981841

  In the technique shown in Patent Document 1, since the brake can be braked only by a handle lowering operation, the brake is required to have a space that allows the handle to be tilted backward. In other words, braking was not possible in a narrow space. Also, in order to maintain the braked state like a parking brake, it was configured to maintain the braking state by operating the lock lever, but with the handle lowered, the lock lever arranged on the handle base side can be Since it was necessary to operate, the distance between the handle tip and the lock lever was long and it was difficult to operate. Therefore, the brake device can be braked not only by tilting the handle but also by stepping on the foot, and the brake can be easily locked (parking brake).

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
According to a first aspect of the present invention, the traveling wheel can be lifted and lowered via a hydraulic cylinder, a hydraulic pump for supplying hydraulic pressure to the hydraulic cylinder, and a brake shoe can be pressed against the traveling wheel for braking. The brake body, the swing arm that moves the brake body in the braking direction, the push-pull operation that moves the loading platform back and forth, the operation operation of the hydraulic pump, and the swing arm that rotates the brake body And an oscillating arm that is disposed below and behind the operating portion, and is placed on top of the oscillating arm when the operating portion rotates. And a brake device for a cargo handling vehicle , wherein a brake operating means for operating the brake body is provided below the swing arm .

According to a second aspect of the present invention, the brake operation means includes a brake pedal and a guard member, and the brake pedal protrudes rearward from the lower portion of the swing arm, and the guard member is semicircular in plan view. It is fixed to the brake pedal so as to form a guard space .

  According to a third aspect of the present invention, a parking brake is disposed between the brake body and the swing arm, and the parking brake operating means of the parking brake is disposed on the inner side of the outer periphery of the guard member. Is.

As effects of the present invention, the following effects can be obtained.
That is, the brake operation means is disposed below and below the operation unit, and braking can be performed not only by a hand but also by a stepping operation with a foot, so that operability can be improved.
Also, the braking operation can be performed by the guard member, and the parking brake can be operated in the vicinity thereof, and the operability can be further improved in addition to the improvement in safety.

The side view which shows the whole structure of a cargo handling vehicle provided with the brake device of this invention. FIG. The rear view of a brake device and a raising / lowering device. The side view of a brake device and a raising / lowering apparatus. The top view of a brake device. (A) The top view of the brake body and parking brake at the time of non-braking, (b) The top view of the brake body and parking brake at the time of parking brake braking.

  Below, with reference to FIG.1, FIG.2, FIG.3 and FIG. 4, the whole structure of the pallet lift truck 1 is demonstrated as a cargo handling vehicle. In the following description, the direction of the arrow F shown in FIG. 1 is defined as the traveling direction of the pallet lift truck 1, that is, the front direction, and the front / rear and left / right directions are defined.

  The pallet lift truck 1 includes a load placement unit 2 on which a load is placed, an operation unit 5 in which an operator performs a steering transport operation and a lifting operation, a lift device 3 that lifts and lowers the load placement unit 2, and a brake device that brakes the load. It consists of four.

  The luggage placing portion 2 is inserted into the side space of the pallet on which the luggage is placed and lifted. The baggage placing portion 2 is disposed in the fork-like loading platforms 21 and 21 that are parallel to the left and right and extend in the front-rear direction, and the front traveling wheels 22 and 22 that are disposed in front and lower portions of the left and right loading platforms 21 and 21 and can be raised and lowered. And a base body 23 that extends obliquely upward and rearward from the rear part of the loading platforms 21 and 21 and is connected to the lifting device 3.

  The loading platform 21 has an upper surface as a pallet mounting surface. Since the loading platform 21 is configured symmetrically, only one of the left and right sides will be described. One end of an arm 24 is supported at the front part of the loading platform 21 so as to be rotatable up and down, and is stored in the loading platform 21. A traveling front wheel 22 is rotatably supported at the other end of the arm 24. One end of a connecting rod 25 is pivoted to one side of the arm 24, and the connecting rod 25 is housed in the loading platform 21 and extends rearward. The other end of the connecting rod 25 is connected to one end of the lifting arm 26. The elevating arm 26 is configured as a bell crank ("<") shape when viewed from the side, and the front and rear central portions are rotatably supported by a support shaft 27 horizontally mounted on the base body 23. The other end of the lifting arm 26 is pivotally supported by a bearing body 31 of the lifting device 3 described later.

  The base body 23 is formed in a box shape having a substantially triangular shape when viewed from the front, and is disposed so as to incline from front to back and rear to high. The rear ends of the loading platforms 21 and 21 are fixed to the lower surfaces of the left and right sides of the base body 23, and a support shaft 27 that pivotally supports the elevating arm 26 is provided horizontally on the upper end. A lifting device connecting portion 28 extends rearward from the upper left and right center ends of the base body 23.

  As shown in FIG. 4, the elevating device 3 includes a hydraulic base 35 provided with a switching valve, a relief valve, and an oil passage, a hydraulic cylinder 37 that is fixed to the front of the hydraulic base 35 in the vertical direction, A traveling wheel 34 that is rotatably supported by an axle 30 that is horizontally provided at the lower end of a main longitudinal axis 39 provided below the cylinder 37, and a bearing body 31 that is rotatably supported on the upper outer periphery of the main longitudinal axis 39. An oil tank 33 provided on the outer periphery of the hydraulic cylinder 37 on the hydraulic base 35, a hydraulic pump 36 provided on the rear portion of the hydraulic base 35, a plunger piston 38 for pressurizing the hydraulic pump 36, and the like.

  The traveling moving wheel 34 is integrally connected to the hydraulic base 35 and the operation unit 5, and the traveling moving wheel 34 is rotated left and right in conjunction with the left and right rotation of the handle 51 of the operation unit 5. In this embodiment, it can be rotated to the left and right by about 180 degrees.

  The operation unit 5 includes a handle base bracket 54 fixed to the rear part of the oil tank 33, a handle base 55 connected to the upper part of the plunger piston 38 and the rear part of the handle base bracket 54, and an upper part of the handle base 55. A handle 51 fixed to the handle 51, a grip 52 provided on the upper portion of the handle 51, and a lift switching lever 53 disposed along the grip 52.

  The grip 52 is formed in a rectangular loop shape that is substantially horizontally long when viewed from the front, and an elevation switching lever 53 is provided at the center thereof. The raising / lowering switching lever 53 is connected to an operation portion of a switching valve provided in the hydraulic base 35, and the hydraulic oil is supplied to the hydraulic cylinder 37 by the operation of the raising / lowering switching lever 53 and the relief from the hydraulic cylinder 37 to the oil tank 33. Can be switched. However, the shape of the grip 53 is not limited, and may be an elliptical shape or a horizontal bar.

  In such a configuration, when the raising / lowering switching lever 53 is switched to the raised position and the handle 51 is turned up and down, the plunger piston 38 is raised and lowered, and the pressure oil from the hydraulic pump 36 to the hydraulic cylinder 37 via the switching valve. The oil is fed and the hydraulic cylinder 37 is extended. By this extension, the lifting device connecting portion 28 and the base body 23 at the rear portion of the loading platform 21 are lifted. As the base body 23 is raised, the support shaft 27 is raised, the elevating arm 26 is rotated, the connecting rod 25 is pushed forward, the arm 24 is rotated, and the traveling front wheel 22 moves downward. As a result, the rear part and the front part of the loading platform 21 are lifted, and the load can be lifted. When the grip 52 is pulled or pushed in the lifted state, the traveling front wheel 22 and the traveling moving wheel 34 roll, and the pallet lift truck 1 can carry the load. When the elevating switching lever 39 is switched to the lowered position after the movement, the switching valve is switched, the pressure oil is returned to the oil tank 33, the hydraulic cylinder 37 is reduced, and the loading platform 21 is lowered by its own weight.

  As shown in FIGS. 4, 5, and 6, the brake device 4 is slidable on the brake shaft 40, and a brake shaft 40 that protrudes rearward from the lower portion of the main longitudinal axis 39 to which the axle 30 is attached. A brake body 60, a parking brake 70, springs 43 and 44, a support arm 45 projecting rearward from the middle part of the main longitudinal axis 39, and a swing attached to the rear part of the support arm 45. A moving arm 46, a brake pedal 47 serving as a brake operating means disposed at a lower portion of the swing arm 46, a guard member 48, and a contact member 80 attached to the upper portion of the swing arm 46 are provided.

  The main vertical axis 39 is suspended downward from the hydraulic base 35, and the bearing body 31 is rotatably fitted on the upper part. It can be rotated together with the moving wheel 34.

  The brake body 60 includes a left and right central boss portion 61, a cam portion 62 formed on the rear surface of the boss portion 61, and brake shoes 63 and 63 projecting laterally from both left and right sides of the boss portion 61. The boss portion 61 is fitted on the brake shaft 40 so as to be slidable in the axial direction and not rotatable. That is, the cross-sectional shape of the through-hole formed in the shaft center of the boss portion 61 and the brake shaft 40 is configured by a polygon such as a quadrangle or a hexagon, a spline, or a serration. On the other hand, it can slide in the axial direction (front-rear direction) but cannot rotate. A spring 43 is externally fitted as an urging member on the brake shaft 40 between the boss portion 61 and the main longitudinal axis 39 to urge the brake body 60 to slide backward.

  The cam portion 62 has a cam profile formed on the rear surface of the boss portion 62 and can be engaged with a cam portion 72 formed on a parking brake 70 described later. The cam profile is a convex trapezoidal shape and has a hypotenuse part 62a and a flat part 62b.

  The brake shoe 63 is disposed behind the outer periphery of the traveling wheel 34 so that it can be braked by being pressed against the outer periphery of the traveling wheel 34. A member capable of increasing the frictional force between the brake shoe 63 and the outer peripheral surface of the traveling moving wheel 34 is attached and can be replaced. The brake shoe 63 is urged away from the outer peripheral surface of the traveling wheel 34 by the urging force of the spring 43, and is not normally braked.

  The parking brake 70 includes a boss portion 71 at the center on the left and right sides, a cam portion 72 formed on the front surface of the boss portion 71 so as to face the cam portion 62, and a parking projecting laterally from the left and right sides of the boss portion 71. It consists of parking brake pedals 73 and 73 as brake operation means. The boss 71 is supported so as to be slidable and rotatable with respect to the brake shaft 40. A spring 44 as an urging member is externally fitted on the brake shaft 40 between the rear surface of the boss portion 71 and the front surface of the swing arm 46 to attach the swing arm 46 rearward (clockwise in FIG. 4). It is fast. A space corresponding to the length of the stroke for braking is formed between the rear end of the brake shaft 40 and the front surface of the swing arm 46.

  A cam profile is formed on the front surface of the boss portion 72 so that the cam portion 72 engages with the cam portion 62. The cam profile has a concave shape, and has an oblique side portion 72a and a front plane portion 72b. In the non-actuated state, the hypotenuse part 72 a is in contact with the hypotenuse part 62 a of the cam part 62 at the surface, and the flat part 62 b of the brake body 60 is fitted in the recess of the boss part 71. The parking brake pedals 73 and 73 can be stepped on with the operator's feet, and the parking brake pedals 73 and 73 protrude inside a space formed by a guard member 48 described later. One of the left and right parking brake pedals 73 is for locking, and the other is for unlocking.

  In such a configuration, when the parking brake pedal 73 on the lock side (right side in the present embodiment) is depressed, the boss portion 71 of the parking brake 70 is rotated, and the oblique side portion 72a of the cam portion 72 is the cam portion 62 of the brake body 60. The brake body 60 is slid forward, and the brake shoe 63 is pressed against the outer peripheral surface of the traveling wheel 34 as shown in FIG. The part 72b and the flat part 62b of the brake body 60 are rotated to a position where they contact each other. At this position, the sliding stops, the brake shoe 63 comes into pressure contact with the outer peripheral surface of the traveling wheel 34, the parking brake 70 is applied, and this state is maintained.

  When the parking brake pedal 73 on the unlocking side (left side in the present embodiment) is depressed to release the parking brake 70, the boss 71 of the parking brake 70 is rotated in the opposite direction to the above and the springs 43 and 44 are attached. The force is applied, and the oblique side portion 72a of the cam portion 72 slides on the oblique side portion 62a of the cam portion 62 of the brake body 60 to return to the original engaged state as shown in FIG. Is separated from the outer peripheral surface of the traveling wheel 34, and braking is released.

  Further, the upper and lower middle portions of the swing arm 46 are pivotally supported at the rear end of the support arm 45 via the pivot shaft 41 so as to be pivotable forward and backward. The swing arm 46 includes an upper support rod 46a having an L shape in side view and a lower support rod 46b projecting downward from the lower portion of the upper support rod 46a. The lower front end of the upper support rod 46 a is pivotally supported by the pivot shaft 41 at the rear end of the support arm 45. A brake pedal 47 as a brake operating means and a semicircular guard member 48 in plan view are attached to the lower end of the lower support rod 46b.

  The brake pedal 47 projects rearward and downward from the lower end of the lower support rod 46 b, and the rear end of the brake pedal 47 is fixed to the rear part of the left and right center of the guard member 48. In other words, the brake pedal 47 also serves as a connecting member between the swing arm 46 and the rear side of the guard member 48 to suppress an increase in the number of parts. The brake pedal 47 is located at the lower rear of the operation unit 5 and is disposed at the center of the left and right behind the traveling moving wheel 34. The brake pedal 47 is configured to have a rearward downward slope so that it can be easily stepped on with the right or left foot. Further, even when the brake pedal 47 is stepped off, the guard member 48 can be stepped on and the braking operation can be performed so that the braking operation can be performed reliably, thereby improving safety. In addition, the operation range of the brake operation is expanded by the guard member 48. The front surface of the middle portion of the lower support rod 46b is in contact with the rear surface of the spring 44, and can be interlocked with the brake body 60 via the spring 44 and the parking brake 70.

  That is, when the brake pedal 47 is stepped on, the swing arm 46 rotates about the pivot shaft 41, and the lower support rod 46b rotates forward to disengage the brake body 60 via the spring 44 and the parking brake 70. The brake shoes 63 and 63 are slid forward, and the brake shoes 63 and 63 are pressed against the outer peripheral rear surface of the traveling moving wheel 34 to be braked. When the stepping of the foot is released, the original non-braking state is restored by the urging force of the springs 43 and 44.

  The guard member 48 includes an arc portion 48a, a string portion 48b, and a connecting member 48c, and prevents the operator's feet from entering the lower portion of the traveling wheel 34 from behind the traveling wheel 34. That is, the arc portion 48a is formed by bending a rod in a semicircular shape centering around the intersection of a line connecting the longitudinal axis of the brake shaft 40 and the rear ends of the left and right traveling wheels 34, and The front part is fixed to the left and right rear surfaces of the string part 48b, and the arc part 48a extends horizontally from the lower end of the swing arm 46 to the rear and the left and right sides to form a semicircular guard space. ing. The left and right centers of the arc part 48a are fixed to the rear part of the brake pedal 47 and are arranged in a substantially horizontal direction. In other words, the guard member 48 is disposed in a state of being lifted from the ground surface by a predetermined height (to the extent that a foot does not enter).

  The string portion 48 b is made of a plate and is disposed below the brake body 60. The string portion 48b is horizontally provided in the horizontal direction with the front end of the connecting member 48c fixed to the left and right center rear surfaces, and the rear end of the connecting member 48c is fixed to the lower end of the lower support rod 46b. The left and right widths of the string portion 48b are made to coincide with the left and right outermost widths of the left and right traveling wheels 34 and 34. The left and right sides of the arc portion 48a are fixed to the rear surfaces of the left and right sides of the string portion 48b.

  With this configuration, even when the operator's foot is located behind the traveling moving wheel 34 during the transporting operation, the guard member 48 can not be brought close to the traveling moving wheel 34 and the operator's foot It is possible to prevent the traveling wheel 34 from being caught. Further, since the guard member 48 and the brake pedal 47 are connected, it is possible to brake by stepping on the guard member 48 even when the foot does not reach the brake pedal 47, and the braking operability is improved. It was possible. Further, since the guard member 48 has a semicircular shape, there is no convex portion behind the traveling wheel 34 and the foot is caught even when the handle 51 is rotated during transportation or steering. There is no such thing. In addition, parking brake pedals 73 and 73 are disposed in a guard space formed by the guard member 48 in plan view.

  Further, a contact member 80 is provided at the upper end of the upper support rod 46a of the swing arm 46, and when the brake 51 is braked by the lowering operation of the handle 51, the swing arm 46 can be smoothly rotated and braked. I am doing so. That is, the abutting member 80 has a roller shaft 81 mounted horizontally on the upper end in the left-right direction, and a roller 82 is rotatably supported on the roller shaft 81.

  With this configuration, when carrying out the transportation work while pulling with the grip 52 of the operation unit 5, when the movement of the pallet lift truck 1 is to be stopped, the handle 51 is tilted rearward and downward (rotation). Brake). At this time, the rear surface of the handle base 55 comes into contact with the roller 82 and the upper part of the swing arm 46 is tilted backward, and the lower support rod 46b slides the brake body 60 forward via the spring 44 and the parking brake 70. Thus, the brake shoes 63 and 63 can be pressed against the rear surface of the traveling wheel 34 for braking. When the handle 51 is tilted rearward, the handle base 55 can be tilted by the roller 82 without the upper end of the swing arm 46 being caught, and can be smoothly braked.

  As described above, the loading platform 21 that is supported by the traveling moving wheel 34 via the hydraulic cylinder 37 so as to be raised and lowered, the hydraulic pump 36 that supplies hydraulic pressure to the hydraulic cylinder 37, and the brake shoe 63 is pressed against the traveling moving wheel 34. The brake body 60 that can be braked, the swing arm 46 that moves the brake body 60 in the braking direction, the push-pull operation for moving the loading platform 21 back and forth, the operation operation of the hydraulic pump 39, and the swing arm 46 In the brake device 4 for a cargo handling vehicle including an operation unit 5 that enables a braking operation by turning the swinging arm, the swing arm 46 is disposed below and below the control unit 5. Since the brake pedal 47 is provided as a brake operating means, the brake pedal 47 is disposed below the operation unit 5 and is not only depressed by hand but also by foot. Also able to brake by the operation, the brake pedal 47 to a position in the left-right center, left and right can also be operated by either the foot, it began to be improved brake operability.

  Further, a guard member 48 having a semicircular shape in plan view that prevents the intrusion of the foot into the traveling moving wheel 34 is attached to the swing arm 46 so as to extend horizontally in the left and right rear directions. At the time of steering / transporting operation, the guard member 48 can prevent the foot from entering the lower side of the traveling wheel 34, and can also be prevented from being caught by the guard member 48 and the members disposed inside the guard member 48. Brake operation can be performed by stepping on 48, the brake operation range can be expanded, and the operability can be further improved in addition to the improvement in safety.

  Further, a parking brake 70 is disposed between the brake body 60 and the swing arm 46, and a parking brake pedal 73 as a parking brake operating means of the parking brake 70 is located inside the outer periphery of the guard member 48. Therefore, the parking brake 70 can be operated in the vicinity of the brake pedal 47, which can be performed by a stepping operation with a foot, and the operability of the parking brake can be improved. Further, since the parking brake pedal 73 is located inside the guard member 48, the parking brake pedal 73 does not interfere with the braking operation and the steering operation, and the parking brake 70 can use the brake device 4, so that the number of parts can be reduced. Therefore, it can be configured at low cost. Further, even when there is an obstacle or the like when moving rearward, the guard member 48 hits the obstacle or the like, and the parking brake 70 or the like is protected by the guard member 48.

DESCRIPTION OF SYMBOLS 1 Pallet lift truck 4 Brake device 5 Operation part 21 Loading platform 34 Traveling moving wheel 36 Hydraulic pump 37 Hydraulic cylinder 46 Swing arm 47 Brake pedal 48 Guard member 60 Brake body 63 Brake shoe 70 Parking brake 73 Parking brake pedal

Claims (3)

  A loading platform that is supported by a traveling moving wheel via a hydraulic cylinder so as to be movable up and down, a hydraulic pump that supplies hydraulic pressure to the hydraulic cylinder, a brake body that allows braking by pressing a brake shoe against the traveling moving wheel, and a brake body Material handling transportation comprising a swing arm that moves the swinging platform in the braking direction, and an operation unit that enables a push-pull operation for moving the loading platform back and forth, an operation operation of the hydraulic pump, and a braking operation by rotation of the swing arm. In the vehicle brake device, the swing arm is disposed below and below the operation portion, and a brake operation means is provided below the swing arm.   The cargo handling vehicle according to claim 1, wherein a guard member having a semicircular shape in plan view that prevents a foot from entering the traveling moving wheel is attached to the swing arm so as to extend rearward in the left and right directions. Brake equipment.   The parking brake is disposed between the brake body and the swing arm, and the parking brake operating means of the parking brake is disposed on the inner side of the outer periphery of the guard member. Brake device for a cargo handling vehicle as described.

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