JPH0412132Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a safety device for a loader. The loader includes a bucket cart provided at the front of the vehicle body, and a working device that supports the bucket truck with arms provided on both sides of the vehicle body and drives the bucket truck in the vertical direction or the like. Therefore, the loader seat has a bucket cart in front, arms for driving the bucket cart on both sides, and the back of the seat at the rear, and a passage to the seat is formed by climbing over the bucket cart in front. For this reason, loader safety devices are required to be more reliable than those for other industrial vehicles.

[Prior art]

The safety devices used in conventional loaders include a seat belt that secures the driver in the seat, and a control device that moves the work equipment by pushing up a lever in front of the driver to open a path to the front of the vehicle. Safety device that locks in neutral position
147940) etc. are known.

[Problems solved by this invention]

This invention eliminates the safety lever that protrudes in front of the driver in the driver's seat, which can be an obstacle to operating the loader, and improves the operating environment of the operating loader. This provides a safety device for the loader that can be stopped.

[Means for solving problems]

The loader safety device of the present invention has a working device driven by power, a plurality of driving positions for controlling the supply of power to the working device, and at least one neutral position,
A loader having a control device operable in any position, and a seat, comprising a protective step disposed in the path to the seat and movable to both horizontal and upright positions, and a protective step for movable to the neutral position. It consists of a locking device that locks the protective step, and an actuation device that operates or releases the locking device in conjunction with the displacement movement of the protective step.

In the present invention, a locking device is provided between the protective step provided in the passageway to the driver's seat and the control device that controls the work equipment, and this protective step is displaced to a horizontal position where it can be used as a step board. In this state, the locking device is activated to lock the control device in the neutral position and immobilize the working device. When the driver exits the loader from the loader seat, the upright protective step placed on the path obstructs the driver's passage, and he is inevitably forced to move the protective step and may forget to do so. Therefore, the work equipment can be reliably locked, and the user can step over the protective step and get off the vehicle even more safely. Therefore, even if the driver inadvertently touches the control device when getting off the loader, the working device will not malfunction at all, and accidents to the driver can be prevented.

[Detailed explanation of the structure of the invention]

The loader to which the loader safety device of the present invention is used refers to an industrial vehicle such as a skid steer loader. The loader of the present invention has a working device held in the vehicle body, a control device for controlling the working device, a seat, and a protective step provided in the path to the seat.

The working equipment here refers to an arm supported on both sides of the vehicle, a bucket truck attached to the tip of the arm, a lift cylinder that raises and lowers the bucket truck by rotation of the arm, and a dump cylinder that tilts the bucket truck back and forth. It is composed of a hydraulic system, etc. that operates both cylinders.

The control device has a plurality of drive positions for controlling the supply of power to the working device and at least one neutral position, and can be operated to any position.
Here, power mainly means fluid pressure such as oil pressure or air pressure, but in special cases it may also be electric power for driving an electric motor. The control positions include, for example, a raising drive position for raising the bucket tote, a lowering drive position for lowering the bucket tot, a forward tilting drive position for tilting the bucket tot forward, a backward tilting drive position for tilting the bucket tot backward, and the like. The neutral position is the position where the bucket is not raised or lowered or tilted forward or backward.

As this control device, for example, an operating pedal can be used. For example, pressing the pedal forward drives the bucket to lower or tilt the bucket forward, and pressing the pedal backward drives the bucket tot in the direction of raising or tilting backward. Drive. Furthermore, in the neutral position where the pedal is held in a horizontal position, the movement of the bucket is blocked.

The locking device locks the control device in the neutral position, and mechanically engages with the control device in the neutral position to lock the control device inoperable.

The working device is driven in response to the movement of the protective step into the horizontal or upright position, and this movement activates or releases the locking device.
This working device can be constructed of an electric type using a link mechanism, an electromagnetic clutch, an electromagnetic valve, etc.

The protective step is pivotally attached to the top of the vehicle body, which provides a passageway to the seats, and protects the driver's feet during cargo handling, and is responsible for activating and confirming the loading lock when getting on and off the vehicle. This contributes to improving the safety and convenience of the system.

[Function and effect of the idea]

The loader safety device of the present invention is such that when the protective step is displaced to a horizontal position where it can be used as a footboard, the working device operates the locking device in conjunction with this movement and locks the control device in the neutral position. . Therefore, the working device is reliably brought to a stopped state due to the restriction of the control device. This completely eliminates the risk of malfunctioning of the implement when the driver steps over the protective step and dismounts. Further, when the protective step is displaced into an upright position, the working device is activated to release the locking device and the control device can be operated normally. Moreover, the protective step that always stands upright during cargo handling and protects the driver's feet obstructs traffic when getting off the vehicle, forcing the driver to displace it.
The driver activates the locking device without forgetting,
Moreover, the execution can be reliably visually confirmed. Furthermore, the horizontally displaced protective step functions as a footboard, thereby significantly improving the safety and ease of getting on and off the vehicle.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall side view showing one embodiment of the present invention, and FIG. 2 is a loader 1 in which the present invention is implemented.
0 is an overall perspective view.

The loader 10 includes a vehicle body 11 in which an engine is housed, a plurality of wheels 12 provided on both side surfaces of the vehicle body 11, a cab portion 13 provided above the vehicle body 11, and a cab portion 13 provided above the vehicle body 11. a working device 14 disposed on the front side of the vehicle body 11;
A driver's seat 15 provided on the upper surface of the vehicle body 11, and a safety device A whose main parts are illustrated in FIG.
(described in detail later). The working device 14 includes a bucket 14A for scooping up dirt and the like, a pair of arms 14B for supporting the bucket 14A, and a lift cylinder 14C for raising and lowering the bucket 14A via the arms 14B. It consists of a dump cylinder 14D for tilting the bucket 14A with respect to the arm 14B.

The safety device A has a configuration as shown in FIG. That is, a protection step 21 is provided at the front end of the upper surface 11a of the vehicle body 11, and a rod 23 is pivotally connected to a lever 22 fixed to the lower side end of the protection step 21. On the other hand, a bearing member 24 is fixed on the floor surface 11b of the vehicle body 1, and a link rod 25 whose both ends are pivotally supported by the bearing member 24 is disposed.
However, lock levers 27 are each fixed approximately at the center.

The lower end of the rod 23 mentioned above is pivotally attached to the tip of the lever 26. Therefore, when the protective step 21 is moved from an upright position as shown by the solid line to a horizontal position as shown by the two-dot chain line, the rod 2
3 is raised, and the link rod 25 is rotated counterclockwise in FIG. 1 via the lever 26.

Further, a block 28 is fixed on the floor surface 11b of the vehicle body 11, and a central portion of the lower surface of a driving foot pedal 29 is pivotally connected to the block 28. A locking guide 30 is fixed to the lower surface of the front end of the driving foot pedal 29, and a protrusion 29a is formed on the lower surface of the center, and one end of a rod 31 is pivotally attached to the tip of the protrusion 29a. ing. The rod 31
The other end is pivotally connected to the projecting end of the control valve 32. The control valve 32 is for hydraulically controlling the movement of the above-mentioned working device 14.

The rotation of the protection step 21 is made possible by the configuration shown in FIG. That is, vehicle body 1
This is because both ends of a shaft 34 are pivotally supported by a bearing member 33 fixed to the upper surface 11a of the protective step 1, and both convex portions 21a and 21b of the protective step 21 are fixed to the shaft 34. Therefore, when the step 21 is manually moved in the direction of the arrow, the step 21 will rotate around the shaft 34 and the rod 23 will rise.

An engagement pin 35 that protrudes toward the other protrusion 21a is fixed to the protrusion 21b, and the vehicle body 1
A locking fitting 37 is pivotally attached to the upper surface 11a of the locking member 1 via a fixing bracket 36. This lock fitting 37 is urged toward the pin 35 by a tension coil spring 38 whose one end is locked to the upper surface 11a. Therefore, when the retractable step 21 is tilted in the direction of the arrow in FIG. 3 and placed in a horizontal position as described above, the pin 35 and the lock fitting engage, and the step 21 is maintained in a horizontal position.

One end of a cable 40 passing through the guide pipe 39 is connected to the upper end of the lock fitting 37. The other end of the cable 40 is connected to a manual lever 41 on the driver's seat, so when the lever 41 is moved in the direction of the arrow, the lock fitting 37 and the pin are disengaged, and the protective step 21 is moved by the biasing force of the spring 42. Return to the original upright position.

Next, the operation of this embodiment will be discussed. When the driver is seated in the seat, the protective step 21 is in the solid line state shown in FIGS. 1 and 2, that is, in the upright state. When the driver exits the vehicle after completing the predetermined task, the driver manually repeats step 21.
The pin 35 and the lock fitting 37 are engaged with each other by rotating in the direction of the arrow shown in FIGS. As a result, the lock bar 27 rotates via the rod 23, lever 26, and link rod, and the tip of the lock bar 27 engages with the recess of the locking guide 30, so that the pedal 29 is maintained in an immovable state. In this state, the driver steps over the protective step 21 and exits the vehicle.

Also, when riding a vehicle, follow the same protective step 21.
(which is maintained in a horizontal state) and sit on the seat 15, and then press the manual lever 41.
By moving the pin 35 in the direction of the arrow, the engagement between the pin 35 and the lock fitting 37 is released, and the protective step 21 is returned to its upright state.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a perspective view of a loader 10 in which the present invention is implemented.
3 is a perspective view of the vicinity of the protection step 21 in FIG. 1, FIG. 4 is a perspective view of the vicinity of the link rod 25, and FIG. 5 is a front view showing details of the vicinity of the lock fitting 37 of FIG. 10... Loader, A... Safety device, 21... Protective step, 27... Lock lever, 29... Foot pedal, 30... Locking guide, 32... Control valve, 35... Engaging pin, 37... ...Lock fittings.

Claims (1)

[Claims for Utility Model Registration] A working device driven by power, a plurality of driving positions for controlling the supply of power to the working device, and at least one neutral position,
A loader having a control device operable in any position and a seat, comprising a protective step disposed in the passageway to the seat and movable in both horizontal and upright positions, and a protective step for movable the control device in a neutral position. A safety device for a loader comprising a locking device that locks the loader, and an actuation device that operates or releases the locking device in conjunction with the movement of the protective step.