JPS6319263Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a cabin tilting device that is installed in, for example, a large truck and tilts a cabin including a driver's seat during maintenance and inspection of an engine or the like.

In large trucks, the engine, transmission, etc. are located below the cabin containing the driver's seat, so maintenance and inspection of these components must be performed after tilting the cabin. In the tilt structure, one end of the cab frame constituting the cabin is rotatably supported on the chassis frame constituting the vehicle body via a pivot part, and a telescopic elevating body such as a hydraulic cylinder is attached to the chassis frame. Connected to the cab frame,
By expanding and contracting the elevating body, the cabin can be rotated using the pivot as a fulcrum and can be held tilted.

The above operation is possible by rotating an operating lever whose one end is pivotally supported. In other words, the operating lever and the elevating body are mechanically or electrically connected, and when the operating lever is held in a horizontal position, the elevating body is in its most retracted state, and the cabin is in its normal position when traveling or stopping. be. When the above operating lever is manually rotated to the vertical position,
A hydraulic circuit and an electric circuit operate to extend the elevating body and tilt the cabin. When the control lever is rotated again to its original horizontal position, the elevating body retracts and the cabin returns to its normal position.

The reason why the tilt biasing of the cabin is manually instructed in this way is to ensure the prevention of danger due to erroneous operation.

By the way, when the operating lever is in the vertical state, this pivot portion is located at the upper end and suspends the operating lever, so it is relatively easy to hold it because it has its own weight. However, when the operating lever is held in a horizontal state, its own weight is applied in the vertical direction, so it inevitably tends to return to the vertical direction. Naturally, a holder is provided to hold the operating lever in a horizontal position, but in many cases, the operator does not engage the holder reliably when the operating lever is inexperienced or insufficient.
Furthermore, even if the operating lever is securely engaged with the holder, there is a risk that the operating lever may slip out of the holder and rotate to a vertical position if vibration is applied to the operating lever, such as when driving on rough roads. These cases are extremely dangerous as the cabin may tilt inadvertently.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to provide a horizontal piece integrally with the guide plate that guides the operating lever, so that when the operating lever comes out of the holder, the horizontal piece is To provide a cabin tilt device that is received by the horizontal piece and further prevented from falling off from the horizontal piece with a lock pin that can be freely hooked and removed from the horizontal piece, thereby doubly preventing malfunction of the lifting means and improving safety. This is what I am trying to do.

An embodiment of the present invention will be described below based on the drawings. Figures 1A and 1B show a large truck, in which a plurality of wheels 2 are pivotally connected to a vehicle body 1, a loading platform 3 is mounted on the vehicle body 1, and a driver's seat 4 is provided via a cabin tilt device S to be described later. A cabin 5 is rotatably supported. FIG. 1A shows the normal attitude of the cabin 5, and FIG. 1B shows the tilted attitude. The cabin tilt device S is constructed as shown in FIG.
In the figure, 6 is a chassis frame that constitutes the vehicle body 1, and 7 is a cab frame that constitutes the cabin 5. The front end of the cab frame 7 is pivotally supported to the chassis frame 6 via a pivot 8. The pivot portion 8 includes a bracket 9 provided on the chassis frame 6, a bracket 10 provided on the cab frame 7, a suspension arm 12 that connects these brackets 9, 10 via pivot pins 11, 11, and the cab frame. 7 and a receiving spring 13.

A receiving spring 15 is provided on the rear side of the cab frame 7, and together with the receiving spring 13 forms the suspension when the cabin 5 is in its normal position. The receiving spring 15 is provided at the upper end of a stay 16 that is erected on the chassis frame 6, and this receiving spring 15 supports a locking mechanism 18 that removably locks a fixing pin 17 provided on the cab frame 7. . This lock mechanism 18 is hydraulically operated in response to a command from a switching mechanism 19, which will be described later.

Further, an elevation mechanism 20 constituting an elevation means is provided near the pivotal support portion 8. That is, reference numeral 21 denotes a tilt hydraulic cylinder, which is an elevation body attached to the chassis frame 6 with its axis directed vertically and with a piston rod 22 protruding from the top. This tilt hydraulic cylinder 21 is a double-acting cylinder with a rod on one side, and one end of a rib 23 is pivotally supported on the upper end of the piston rod 22 so as to be freely rotatable. Furthermore, the hydraulic cylinder 21
A stay 24 is attached to the rib 23 in parallel with the stay 24 via a support 25. The upper end of the stay 24 and the other end of the rib 23 and an upturn bracket 26 provided on the lower end surface of the cab frame 7 are all pivotally supported. Therefore, when the piston rod 22 rises, it comes into contact with the upturn bracket 26 via the rib 23, and the stay 24
The hydraulic cylinder 21 is provided with a minimum compression detection switch 27, and the support 25 is provided with a tilt completion switch 28. The support 25 is provided with a lock lever 29 that can be freely engaged with and disengaged from a guide hole (not shown) provided on the lower part of the side surface of the stay 24.
1 is connected to the switching mechanism 1 through oil pipes 30, 30.
It is connected to 9.

This switching mechanism 19 constitutes a lifting means together with the lifting mechanism 20, as shown in FIG. 3. That is, 31 is the electric motor 3
This is a hydraulic pump that is integrally connected to 2. The hydraulic pump 31 communicates with the tilt hydraulic cylinder 21 and the hydraulic cylinder (not shown) of the lock mechanism 18 via oil pipes 30, 30. These hydraulic pump 31 and electric motor 32 are connected to a bracket 33.
The operating lever 34 has one end pivotally supported therein. An operating cam 35 is fixed to the pivot side end of the operating lever 34, and depending on the rotational position of the operating lever 34, a changeover valve switch 36 and a tilt switch 37 attached to the bracket 33 are turned on.
It is now possible to turn it off. In addition, the operating cam 3
5 has one end connected to the lock lever 29 and the other end of the control wire 38 fixed thereto.
Further, a first holder 39 and a second holder 40 made of leaf springs are attached to the bracket 33 in horizontal and vertical positions with respect to the pivot portion 34a of the operating lever 34, with an angle of about 90 degrees to each other. be done. The operation lever 3 is attached to these first and second holders 39 and 40.
4 is removable. In other words, the operating lever 3
4 is rotatable within a range of about 90 degrees between the horizontal and vertical positions, and can maintain its position on both sides thereof. Above bracket 33
A guide plate 41 is provided across the first and second holders 39 and 40. This guide plate 4
1, the end on the first holder 39 side is as shown in FIG. 4A,
As shown in B, it is bent into a substantially U-shaped cross section to form the first stopper portion 42 . That is, when the operating lever 34 is engaged with the first holder 39, the intermediate portion of the operating lever 34 is engaged with the first stopper portion 42.
It is designed to be inserted into the position. Further, when the operating lever 34 falls off from the first holder 39 for some reason, a lower horizontal piece 42a, which is a horizontal piece of the first stopper portion 42, receives the operating lever 34. A through hole 43 is provided at the front end of the upper horizontal piece 42b and the lower horizontal piece 42a of the first stopper part 42, and at a portion facing each other.
43 is drilled, and a lock pin 44 is removably inserted therethrough. The upper end of the lock pin 44 has a knob 4.
4a, and is connected to the guide plate 41 via a chain 45 of sufficient length. Further, the guide plate 41 is connected to the first stopper portion 42.
As shown in FIG. 3, it is bent into a substantially semicircular shape toward the second holder 40, and after passing through the second holder 40, it contacts the bracket 33 again and is folded back so as to protrude largely toward the front. A second stopper portion 46 is provided to be bent. Therefore, the operating lever 34 is connected to the first and second holders 39,
40 along the guide plate 41 surface, but cannot rotate beyond the second stopper portion 46.

Therefore, in order to tilt the cabin 5, the first
The operating lever 34 held by the holder 39 is
It is only necessary to rotate it toward the holder 40. The operating lever 34 is in the state shown in FIG. 3 and FIG. do. The intermediate portion of the operating lever 34 moves along the lower horizontal piece 42a of the first stopper portion 42 of the guide plate 41. When the middle part of the operating lever 34 comes out of the front end of the lower horizontal piece 42a, it is removed as shown in FIG. 4B.
As shown in FIG. 2 , the guide plate 41 rotates in the vertical direction along the surface of the guide plate 41 and engages with the second holder 40 . When the operating lever 34 approaches the second holder 40 to some extent, the operating cam 35 sequentially contacts the changeover valve switch 36 and the tilt switch 37, turning them on. As the electric motor 32 is driven, an electric circuit and a hydraulic circuit (not shown) are switched, and the locking mechanism 18 unlocks the fixing pin 17, and the piston rod 22 of the tilt hydraulic cylinder 21 rises. Therefore, the cabin 5 is gradually tilted using the pivot portion 8 as a pivot point. When the tilt completion switch 28 detects that the device has been tilted to a predetermined angle, it issues a completion signal and stops the electric motor 32. piston rod 2
2 maintains its position, the cabin 5 remains tilted as shown in FIG. 1B, making it possible to maintain the exposed engine E and other components.

In order to return the cabin 5 to its original normal position, the operating lever 34 may be rotated to the horizontal position. That is, the operating lever 34 is pulled out from the second holder 40 and rotated along the guide plate 41. In the case of returning, it is similarly inserted into the first stopper part 42 and engaged with the first holder 39. Finally lock pin 4
4 into the through holes 43, 43 again. When the operating lever 34 approaches the first holder 39 to some extent, the hydraulic circuit is switched and the electric motor 32 is driven. Therefore, the piston rod 22 descends,
The cabin 5 returns to its original normal position. Pivot pin 17
When each switch detects that the electric motor 32 is locked in the lock mechanism 18, the electric motor 32 is stopped and electric circuits such as alarms are turned off.

At this time, the operating lever 34 is moved to the first holder 39.
If it is not properly engaged, it may fall off. However, even if it falls off, the middle part of the operating lever 34 is received by the lower horizontal piece 42a of the first stopper part 42, so it will not immediately rotate and fall from there to the second holder 40 side. Furthermore, even if the vehicle is traveling on a track and there is severe vibration, the lock pin 44 prevents the operating lever 34 from falling off the lower horizontal piece 42a. Therefore, even if the operating lever 34 should come off the first holder 39, it will be securely held by the first stopper portion 42, so that there will be no malfunction of the tilt.

As explained above, according to the present invention, the cabin is provided with an elevating means for tilting the cabin, the elevating means is actuated by a rotatably supported operation lever, and a guide plate for guiding the operating lever is provided, and a tilt-down means is provided. A first holder and a second holder are provided to releasably hold the operating lever in the tilt-up position and the tilt-up position, and when the operating lever slips out of the first holder for some reason, it is caught by a horizontal piece provided on the guide plate. In addition, a lock pin that can be hooked on and removed from the horizontal piece is used to prevent the operating lever from falling off the horizontal piece, which doubles the prevention of malfunction of the elevating means with a very simple structure and improves safety. This has the effect of making it possible to promote

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1A is a front view of the truck in its normal position, FIG. 1B is a front view of the truck in its tilted state, FIG. 4 is a perspective view of the main part, and FIGS. 4A and 4B are partial longitudinal cross-sectional views in different states. 1... Vehicle body, 8... Pivotal section, 5... Cabin,
6... Chassis frame, 32... Electric motor,
31...Hydraulic pump, 21...Elevating body (tilt hydraulic cylinder), 34...Operation lever, 41...Guide plate, 39...First holder, 40...Second holder, 42a...Horizontal piece ( lower horizontal piece),
44...Lock pin.

Claims (1)

[Scope of utility model registration request] A cabin equipped with a driver's seat that is rotatably supported on a frame via a pivot, an elevating means that includes a telescoping elevating body such as a hydraulic cylinder that tilts and biases the cabin, a hydraulic pump, an electric motor, etc. an operating lever that is pivotally supported by the frame and operates the elevating body by rotating and biasing it to a predetermined position; a guide plate provided on the frame that guides the operating lever; a first holder and a second holder that are detachably held in a tilt-up side position; a horizontal piece that is integrally provided with the guide plate and is located between the pivot portion and the first holder and receives the operating lever; A cabin tilt device characterized by comprising a lock pin which is detachably provided on the horizontal piece and is located on the withdrawal side of the operating lever.