JPS5934536B2 - Load box tilting safety device for three-turn dump truck or side dump truck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cargo box tilting safety device for safely tilting a cargo box in a three-turn dump truck or a side dump truck.

Generally, three-turn dump trucks or side dump trucks have
Hinges are installed at four locations between the cargo box and the vehicle body frame, front, rear, left, and right.The hinges are composed of a hinge shaft, a shaft receiver, and a hook.The hooks are rotated to release the lashing of each hinge shaft. Then, the hydraulic cylinder is extended to tilt the cargo box in each direction.

The hook is designed to be positioned in either the locked or released state, but due to an erroneous operation, the hook may end up in the middle position between the locked and released state, that is, the hinge shaft may be partially attached. If you tilt the cargo box while it is hanging,
Since there is a possibility that a cargo box may fall from the vehicle body frame and cause a serious accident, there is a desire for a new safety device that allows cargo boxes to be tilted safely.

The present invention was made in view of this point, and only when the hook is located in either the locked state or the released state,
To provide a cargo box tilting safety device for a three-turn dump truck or a side dump truck, which enables switching operations of hydraulic cylinders and tilts the cargo box.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, reference numeral 1 denotes a hinge switching device in a three-turn dump truck, which switches the hinge position so that a cargo box 3 mounted on a vehicle body frame 2 can be tilted backward and to both sides.

At the bottom of the packing box 3, a main girder 4 is arranged in the front-rear direction, and a stiffener 5 is arranged in the left-right direction, and brackets 6L, 6R are attached to the ends of the stiffener 5 at both left and right ends of the front part of the packing box 3. are fixed to the brackets 6L and 6R, and hinge shafts 7L and 7R are provided in the front-rear direction at the tips of the brackets 6L and 6R.

Further, a support member 8 is fixed to the left and right sides of the rear portion of the cargo box 3 at the rear of the stiffener 5, and a support shaft 9 is fitted into the support member 8 so as to be rotatable in the left and right direction.

The support shaft 9 spans both ends of the packing box 3, and brackets (IOL, 10R) are fixed to both sides of the support shaft 9, and the bracket 10L
, 10R are provided with hinge shirts) 11L and 11R in the front-rear direction.

On the other hand, stays 12L, 12R, 13L, and 13R in the left and right direction are fixed to the vehicle body frame 2 at both left and right sides of the front and rear portions thereof, and project laterally.

At the ends of the hinge shafts 12R, 13L, and 13R, there are locking members 14 corresponding to the hinge shafts 7L, 7R, 11L, and 11R.
L, 14R, 15L, and 15R are provided.

The locking members 14L, 14R, 15L, 15R each include two shaft receiving portions 16L, 17L, 17R and hooks 18L, 18R, 19L, 19R, and the shaft receiving portions 16L, 17L, 17R are connected to the hinge shafts 7L, 7R, 11L, 11R engage to hold the hinge shafts 7L, 7R, 11L, 11R, and semicircular recesses 20L, 20R, 21L, 2 open upward.
1R is formed.

The hooks 18L, 18R, 19L, 19R have the shaft receiving portions 16L, 16R, 17L, 17R at their lower portions.
The hinge shirt 7L is rotatably supported by a pin 22 in the front and rear direction, and extends above the semicircular recesses 20L, 20R, 21L, and 21R.

7R, 11L, 11R are shaft receiving parts 16L.

It is held between 16R, 17L, and 17R.

Furthermore, four hooks 18L, 18R, 19L.

19R is a hook 18L for two located diagonally.

18R, 19L, 19R1 i.e. front right hook 18R
and the rear left hook 19L, and the front left hook 18L and the rear right hook 19R connect to the first and second connection mechanisms 23.
24, and both the connecting mechanisms 23 and 24 are connected via the first
and is linked to the operating device 27 via the 20th rod 25°26.

The first connecting mechanism 23 has bell cranks 28 on both the front left and right sides and the rear left side of the vehicle body frame 2, and a bell crank 28 is attached to the pin 2 in the vertical direction.
9, the entire bell crank 28 is formed by two or three arms of the same length bent at right angles, and the bell crank 28 and both hooks 18R, 19
L is connected with a pin via a rod 30.

In the second coupling mechanism 24, a bell crank 31 is rotatably supported on the front right side and the rear right side of the vehicle body frame 2 by vertical pins 32, and both bell cranks 31 are connected to the bell crank 28. Two or three of the same length
The bell crank 28 and both hooks 18L are formed by bending two arm portions at right angles.

19R is connected with a pin via a rod 33.

The first and twentieth ends 25.26 and the rods 30.33 of the first and second connection mechanisms 23, 24 are formed to be adjustable in length, and the first and second connection mechanisms 23.24 are connected, respectively. Each hook is 18L.

18R, 19L, and 19R are connected so that when one of them is in a locked state, the other is in a released state.

The operating means 27, as shown in FIGS. 2 to 4,
A machine frame 34 is fixed to the front right side of the vehicle body frame 2, and within the machine frame 34, a first operating lever 35 and a second operating lever 36 linked to the first and second coupling mechanisms 23, 24 are installed. It will be established.

A holding member 37 is provided within the machine frame 34, and the holding member 37 includes upper and lower plates 37a, 37b and both side plates 37c.

37C, it is formed into a rectangular tube shape, and its side plates 37
A longitudinal pivot pin 38.38 is provided between the side plates 34a, 34a of the machine frame 34 and the side plates 34a, 34a of the machine frame 34.
7 is held rotatably in the vertical direction with respect to the machine frame 34.

On the holding member 37, the boss portions 35a and 36a of both the operating levers 35 and 36 are vertically overlapped to form the upper and lower plates 37.
a, 37b, and the upper and lower plates 37
a, 37b and the boss portions 35a, 36a, and a pivot pin 39 is provided in the vertical direction so that both operation pins <-3
5 and 36 are rotatably supported in the front-back direction with respect to the holding member 37, and are rotatable in the front-rear and up-down directions with respect to the machine frame 34.

Each boss portion 35a, 36 of both operating levers 35, 36
A rearwardly protruding link 40, 41 is connected at one end thereof, and the other ends of the links 40, 41 are connected by pins to the first and twentieth nodes 25, 26.

Further, a first guide groove 42 and a second guide groove 43 are formed on the upper and lower sides of the front plate 34b of the machine frame 34, and the first and second operating levers 35,36 are connected to the first and second guide grooves 43.
It penetrates 2.43 and protrudes forward.

Both guide grooves 42, 43 have horizontal portions 42a, 43a and vertical portions 42b extending downward at both front and rear ends of the horizontal portions 42a, 43a.

43b and guides both operating levers 35 and 36.

Both the operating levers 35 and 36 rotate along both the guide grooves 42 and 43, and the front and rear rotation range thereof corresponds to both the guide grooves 42 and 43.
The hooks 18L, 1 are regulated at both the front and rear ends of the
8R, 19L, and 19R are rotated to the locked or released state, and each operating lever 35, 36 is moved to each guide groove 42, 43.
When moving to the rear end of the horizontal parts 42a, 43a, the rear left and right hooks 19L, 19R are in the locked state, the front left and right hooks 18L, 18R are in the released state, and the horizontal part 42a t
When moving to the front end of 43a, the rear left and right hooks 19L, 19
R is in the released state, the front left and right hooks 18L and 18R are in the locked state, and the vertical portion 42b.

When moving to the lower end of 43b, each hook 18L, 18R.

19L and 19R are each locked.

As shown in FIG. 5, a hydraulic cylinder 44 for tilting the cargo box 3 is provided between the vehicle body frame 2 and the cargo box 3. A switching valve 45 is connected, and an integrally formed hydraulic pump 46 is connected to the hydraulic switching valve 45.

The hydraulic pump 46 supplies pressure oil to the hydraulic cylinder 44 and is connected to a power extraction device 48 via a connecting shaft 47.

The hydraulic switching valve 45 is a three-position switching valve that can be switched between a raised position, a neutral position, and a lowered position.
1 to a torque shaft 52 provided laterally in the center of the vehicle body frame 2, and the torque shaft 52 is connected to a spool (not shown) of the hydraulic switching valve 45 via a rod 53 and a bell crank 54. When the operating lever 50 is operated, the torque shaft 52 rotates and the hydraulic switching valve 45 is switched.

In the hinge switching device 1, when tilting the cargo box 3 backward, the first operating lever 35 and the second operating lever 36
Both the horizontal portions 42a of the first and second guide grooves 42 and 43
, when moved to the rear end of 43a, the rear left and right hooks 19
L and 19R rotate upward and hinge shafts 11L and 1
Front left and right hooks 18L, 1
8R rotates downward to release state, and hydraulic cylinder 4
4, the cargo box 3 tilts rearward about the support shaft 9.

When tilting the cargo box 3 to the right, the first
When the operating lever 35 is moved to the front end of the horizontal portion 42a of the first guide groove 42, the front right hook 18R becomes the locked state, the rear left hook 19L becomes the unlocked state, and the cargo box 3 is moved to the hinge shaft 7R. .

Lean to the right using 11R as a fulcrum.

When tilting the cargo box 3 to the left, the first operating lever 35 is placed at the rear end of the horizontal part 42a of the first guide groove 42, and the second operating lever 36 is placed at the front end of the horizontal part 43a of the second guide groove 43. When rotated, the left front and rear hooks 18L, 19L are in a locked state, the right front and rear hooks 18R, 19R are in a released state, and the cargo box 3 is tilted to the left about the hinge shafts 7L, 11L.

On the other hand, the vehicle body frame 2 is provided with a cargo box tilting safety device 55, and the cargo box tilting safety device 55 controls the first and second operating levers 35 and 36, as shown in FIGS. 1st
The operation system 49 of the hydraulic switching valve 45 can be operated only when the vertical portions 42b and 43b of the second guide groove 42 and 43 are moved to the lower ends of the vertical portions 42b and 43b of the second guide groove 42 and 43. A locking device 56 is associated with the torque shaft 52 of the system 49.

The locking device 56 prevents rotation of the torque shaft 52. A link 57 is provided protruding from the lower part of the holding member 37, and one end of a first horizontal rod 58 is connected with a pin to the lower end of the link 57. The first horizontal rod 58 extends in the left-right direction, and the other end is connected to one end of a bell crank 59 by a pin.

The bell crank 59 is rotatably supported by a vertical pin 60 on the vehicle body frame 2, and one end of a second horizontal rod 61 is connected to the other end with a pin, and the second horizontal rod 61 extends in the front and rear direction. The other end of the shaft 62 is connected by a pin to a link 63 connected to one end of the shaft 62 .

The shaft 62 is held rotatably in the left-right direction, the link 63 is provided perpendicularly to the shaft 62, and a link 64 is connected perpendicularly to the other end of the shaft 62.

The upper end of a vertical rod 65 is connected with a pin to the tip of the link 64, and the lower end of the vertical rod 65 extends near the front of the torque shaft 52, and is connected with an abutment piece 66.

The vertical rod 65 moves up and down when the holding member 37 rotates, that is, when the first and second operating levers 35.36 are rotated along the vertical portions 42b and 43b of the first and second guide grooves 42.43. When the operating levers 35 and 36 are moved to the upper ends of the vertical portions 42b and t3b, the contact piece 66 is at the lower position (see the solid line in Figure 6), and when it is located at the lower end, it is at the upper position (the chain line in Figure 6). (see).

Further, a stopper 67 is connected to the torque shirt 1t 52 in correspondence with the abutting piece 66, and the stopper 67 is at an obliquely downward position (see the solid line in FIG. 6) when the hydraulic switching valve 45 is in the lowered position. , are located in the horizontal position (see the chain line in FIG. 6) in the neutral position, and in an obliquely upward position (not shown) in the raised position.

68 is a guide member that guides the vertical rod 65; 69 is a tension spring that biases the second horizontal rod 61 rearward so that the vertical rod 65 moves upward; .36 is also biased to rotate downward.

Next, the operation of the cargo box tilting safety device 55 will be explained.
When one or both of the first and second operating levers 35 and 36 are located between the first and second guide grooves 42, 43, the vertical rod 65 is moved between the first and second horizontal rods 58. ,61. It is moving downward via the bell crank 59 and shaft 62, and the contact piece 66 is in the downward position. In this state, each hook 18L, 18R, 19
L19R is hinge shaft 7L, 7R, 11L.

11R, and even if an attempt is made to operate the operating lever 50 to extend the hydraulic cylinder 44, the stopper 67 is prevented from rotating upward from the horizontal position by contacting the contact piece 66, and the torque is reduced. The shaft 52 is prevented from rotating, the hydraulic switching valve 45 is prevented from switching to the raised position, and the hydraulic cylinder 44 does not extend.

Subsequently, in order to tilt the cargo box 3 in either direction, the first and second operating levers 35 and 36 are moved into the first and second guide grooves 42.
．． 43 to the front end or rear end of the horizontal parts 42a, 43b and to the lower ends of the vertical parts 42b, 43b, the vertical rod 65 moves upward, the contact piece 66 moves to the upper position, and the stopper 67 The upward rotation is now possible, and the torque shaft 52 is rotated by operating the operating lever 50, the hydraulic switching valve 45 is switched to the raised position, and the hydraulic cylinder 4
4 is extended and the cargo box 3 is tilted.

In this embodiment, although the torque shaft 52 is prevented from rotating, other members of the operating system 49, such as
Of course, the movement of the rods 51, 53 may be prevented, and it goes without saying that the movement of the switching spool of the hydraulic switching valve 45 may be directly prevented.

Further, although the locking device 56 is configured using a link mechanism, the operation system 49 is electrically operated using an electromagnet or the like.
It may also be possible to disable the operation.

Furthermore, although this embodiment has been described with respect to a three-turn dump truck, it is of course applicable to a side dump truck.

As described above, according to the cargo box tilting safety device for a three-turn dump truck or side dump truck of the present invention, when the operating lever is positioned at the end of its rotation range, the locking device is released and the hydraulic switching valve can be switched. This allows the hydraulic cylinder to extend and tilt the cargo box only when the hook is in the locked or released state, making the work of tilting the cargo box extremely safe. be able to.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, in which Fig. 1 is a perspective view of the hinge switching device, Fig. 2 is a partially omitted plan view of the operating means, Fig. 3 is a sectional front view of the same, and Fig. 4 is a front view of the same. 5 is a plan view of the cargo box tilting safety device, and FIG. 6 is a side view of the same. 1...Hinge switching device, 2...Vehicle frame, 3...Logging box, 7L, 7R, 11L, 11R・
... soil shaft, 9 ... support shaft, 14
L, 14R, 15L. 15R...Lock member, 16L, 16R, 17
L. 17R...Shaft receiving part, 18L, 18R, 1
9L. 19R... Hook, 23.24... Connection mechanism, 27... Operating means, 28.31...
... Bell crank, 30.33 ... Rod,
34...Machine frame, 35° 36...Operation lever, 34b...Front plate, 42°43...
... Guide groove, 44 ... Hydraulic cylinder, 45.
...Hydraulic switching valve, 46...Hydraulic pump,
49... Opening operation system, 50... Operating lever, 52
... Torque shaft, 55 ... Load box tilting safety device, 56 ... Locking device, 66 ...
...Abutment piece, 67...Stopper.

Claims (1)

[Scope of Claims] 1. A hinge shaft is fixed to brackets protruding from four locations on the front, right, left, and right of the bottom of the cargo box, while shaft receivers and A locking member is provided with a rotatably pivoted hook or the like, each of the hooks is connected by a connecting mechanism, and a hydraulic cylinder for tilting the cargo box is provided between the cargo box and the vehicle body frame. A hydraulic pump is connected to the hydraulic cylinder via a hydraulic switching valve that can be operated to switch between a raised position, a neutral position, and a lowered position, and the hook is rotated and pressurized oil from the hydraulic pump is connected to the hydraulic cylinder. In a three-turn dump truck or a side dump truck in which a hydraulic cylinder is supplied to tilt a cargo box, a locking device for inhibiting a switching operation of the hydraulic switching valve to a raised position is linked to an operating system of the hydraulic switching valve. further provided with an operating means including a rotatable operating lever linked to the locking device and the coupling mechanism, the locking device positioning the operating lever at the end of its rotation range. 1. A cargo box tilting safety device for a three-turn dump truck or a side dump truck, characterized in that the restraint is released when the container is tilted. 2. The operating means is provided with an operating lever that is rotatable in the front-rear and up-down directions, and is formed with a U-shaped guide groove that guides the operating lever, and the guide groove allows the operating lever to rotate in the front-rear direction. The hook is guided to rotate in the vertical direction at the end of the motion range, and the hook is rotated by rotating the operating lever back and forth, and the locking device is operated to release the lashing by moving the operating lever up and down. A cargo box side safety device in a three-turn dump truck or a side dump truck as described in Scope 1.