JPH0455055Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention uses a braking device that mechanically brakes the driving wheels by pressing the brake pedal, and a control shaft that rotates by swinging the control lever back and forth to move forward. The present invention relates to an emergency stop device for a hydraulically driven rolling compact machine, which is equipped with a hydraulically driven operation device that controls reversing, stopping, and forward and backward speeds.

Conventional technology Conventionally, this type of hydraulically driven compaction machine has a braking device that mechanically brakes the driving wheels by depressing the brake pedal, and an operating lever fixed to the control shaft that moves forward and backward. However, in the event of an emergency stop, it is extremely difficult to brake the rollers simply by pressing the brake pedal. Ta. For example, Japanese Utility Model Application Publication No. 146506/1983 discloses a device in which an emergency stop can be made by automatically switching the operating lever to the stop position simply by depressing the brake pedal. According to this, engaging portions are provided at the swinging ends of a swinging body pivoted on a control shaft, and transmission devices each having a slide hole that loosely fits into these engaging portions are connected to a brake pedal, and are operated. When the lever is moved to the forward or backward movement position, the engaging part is configured to slide into the slide hole, and when the brake pedal is depressed with the operating lever in the forward or backward movement position, the transmission is pulled down and one of the engaging parts is moved. It is pulled down by the upper end surface of the slide hole of the transmission, thereby rotating the rocking body and switching the operating lever to the stop position.

Problems to be Solved by the Invention However, with the conventional configuration described above, when the brake pedal is depressed and the operating lever is switched from the forward/reverse position to the stop position, both engagements are moved so as to position the operating lever at the stop setting position. Since the mating part must be set so as to accurately abut the upper end surface of the slide hole, it is difficult to adjust the length of the transmission tool for this setting, and the adjustment process requires a lot of time. Furthermore, even if there is a slight deviation in the length of the transmission, the control lever may deviate from the set stop position or become unable to swing to the forward or backward movement position, which could lead to an accident or damage to the equipment. It was hot. Furthermore, since the engaging portion of the rocking body constantly slides within the slide hole as the operating lever swings back and forth, there is also the problem that the operating lever lacks smoothness.

Means for Solving the Problem: A driven lever is fixed to the control shaft, and a pair of swinging levers are rotatably attached to each of them, an engaging portion is provided on the driven lever, and the engaging portion is provided on the pair of swinging levers. contact parts that are located on both sides of the part and can be engaged with the engaging parts are provided, one end of each link is rotatably connected to the swing lever, and the other ends of the links are connected to each other. a coupling device rotatably connected to the brake pedal lever, and the connecting portion is connected to the brake pedal lever so that the abutting portions of the pair of swinging levers swing toward the engaging portion when the brake pedal is depressed. The frame is further provided with a frame that controls the rotation of the pair of swing levers at a position where the abutting portions of the pair of swing levers abut against the engaging portions of the driven levers when the operating levers are in the stop position. It is characterized by being provided with a positioning stopper for stopping.

Operation When the brake pedal is pressed while the rolling compaction machine is running, the brake pedal rotates around the base and the coupling pulls down the pair of links, which then move the pair of swinging levers so that the abutting parts approach each other. Rotate it so that As a result, one of the contact portions contacts the engagement portion of the driven lever, causing the driven lever to rotate together. Thereafter, both abutting portions abut against the positioning stopper to stop the rotation of the brake pedal lever and the pair of swinging levers, and at the same time, the engaging portion of the driven lever abuts both abutting portions. position, and positions the operating lever to the stop position. As a result, the hydraulic drive is stopped and the driving wheels are mechanically braked by the braking device to immediately stop the rolling machine.

Embodiment In FIGS. 1 to 3, reference numeral 3 denotes a control shaft connected to a hydraulic pump (not shown) operated by a prime mover (not shown) provided in the frame 1, and one end of which is connected to a bearing 7 in the frame 1. Therefore, it is rotatably supported, and the base of the operating lever 4 is fixed to one end thereof, thereby forming a hydraulic drive operating device 6.
The discharge amount and pressure oil direction of the hydraulic pump are controlled by rotating the control shaft 3 by swinging the control lever 4 back and forth, and the pressure oil is supplied to the hydraulic motor 8 (Fig. 3) to drive the rollers. Ten drive wheels are driven. This roller 10 moves the operating lever 4 of the hydraulic drive operating device 6 to forward F, stop N, and backward R as shown in FIG.
Forward movement, stopping, and retraction are controlled by swinging back and forth to each position, and the forward and backward speeds are controlled by being positioned at various intermediate positions before reaching the forward F and reverse R positions. ing.

Reference numeral 12 denotes a brake pedal lever having a brake pedal 13 provided below the control shaft 3, and as shown in FIGS. 1 and 2, it is pivoted to a shaft 14 attached to a bracket 18 provided on the frame 1 so as to be able to swing vertically. and bracket 1 also provided on frame 1.
It is prevented from coming off by a plate 15 attached to 7 with bolts 16. This brake pedal 12 is made up of a bracket 20 provided on the frame 1 and a coil spring 21 with one end attached to each brake pedal lever 12.
The stopper 24 is urged upward by a bolt and is in contact with a stopper 24 made of a bolt whose position can be adjusted in the vertical direction. 26 is a detection switch that detects depression of the brake pedal 13 by a predetermined amount from the lower part of the brake pedal lever 12, and upon this detection, a well-known braking device is activated to mechanically stop the drive wheels. .

Reference numerals 31 and 35 denote a pair of swinging levers, which are formed in a substantially U-shape, and have boss members 32 and 3 having fitting holes 32b and 36b in their bent portions 31c and 35c.
6 are welded to each other, and their fitting holes 32b and 36b are rotatably fitted to the control shaft 3 at a position substantially directly above the brake pedal lever 12, respectively. Contact plates 33 and 37 having contact parts 33a and 37a that can be engaged with an engagement part of a driven lever 50 and a positioning stopper, which will be described later, are integrally provided at the upper ends of the pair of swing levers 31 and 35. There is. The pair of abutting portions 33a and 37a are connected to a driven lever 5, which will be described later.
They are positioned so as to face each other on both sides of the engagement portion of No. 0. One ends of links 41 and 42 having the same length are rotatably connected to the lower ends of the pair of swing levers 31 and 35, and the other ends of these links 41 and 42 are connected together with one end of a turnbuckle 44 by bolts. 4
5 and a nut 46, and the other end of the turnbuckle 44 is rotatably connected to approximately the center of the brake pedal lever 12 by a bolt 47 and a nut 48.

Reference numeral 50 denotes a driven lever fixed to the control shaft 3, which serves as an engaging portion of the present invention so that it comes into contact with the lower portions of the contact portions 33a and 37a when the pair of swinging levers 31 and 35 rotate. The illustrated protruding pin 51 is welded parallel to the control shaft 3. On the other hand, a protruding pin 53, which is exemplified as a positioning stopper of the present invention, is attached to a bracket 55 which is provided on the frame 1 so that its position can be adjusted, and is parallel to the control shaft 3 so as to be in contact with the upper part of the abutting portions 33a and 37a. It is welded. This protruding pin 53 has the same diameter as the protruding pin 51. This protruding pin 53 is provided so as not to interfere with the protruding pin 51 of the driven lever 50 that is rotated, and the protruding pin 51 of the driven lever 50 when the operating lever 4 is in the stop position N
and are provided so as to overlap when viewed from the axis of the control shaft 3. In this embodiment, the protruding pin 5 of the driven lever 50 when the operating lever 4 is in the stop position N
1 and the protruding pin 53 are set directly above the control shaft 3. Therefore, the driven lever 50 is
By swinging the operating lever 4 back and forth from the solid line position in the figure to the maximum speed position, it is swung to the imaginary line position in the figure. On the other hand, the pair of swing levers 31, 3
Reference numeral 5 denotes a driven lever 5 whose abutting portions 33a and 37a swing when the brake pedal lever 12 is stationary.
The above connection is made in such a way that it is always out of contact with the protruding pin 51 of No. 0.

Reference numeral 56 denotes a stopper which is welded to the frame 1 and abuts against the swing lever 31 when the abutting portions 33a and 37a are separated from each other to prevent the swinging lever 31 from rotating in the separating direction. Note that in the above configuration, the engaging portion is the side surface of the driven lever 50,
Further, the positioning stopper can be made of an appropriate member other than the pin.

Next, the effect will be explained.

If an emergency stop is required while the rolling machine is running with the operating lever 4 in the forward F or reverse R position, depress the brake pedal 13 and the turnbuckle 44 will release the connecting portion 43 of the links 41 and 42. A pair of swinging levers 3 are pulled downward.
1 and 35 are rotated so that the contact portions 33a and 37a approach each other. Then, the operating lever 4 moves forward
or the driven lever 50 located in the backward R position
One of the abutting portions 33a, 37a contacts the protruding pin 51, and thereafter, the protruding pin 51 is rotated integrally with the abutting portions 33a, 37a. Then, the abutting portions 33a and 37a abut the protruding pin 53 almost simultaneously, and at the same time the protruding pin 5
1 is positioned in a state in which it is in contact with both the contact portions 33a and 37a (state shown by the imaginary line in FIG. 1).
As a result, the operating lever 4 is accurately positioned at the stop position N, and the driving force is released. brake pedal 1
3 until the contact portions 33a, 37a contact the protruding pin 53, the brake device is activated by the detection switch 26, and the drive wheels are braked. Therefore, the brake pedal 13 is connected to the contact portions 33a, 37a.
When the roller 10 is depressed until it comes into contact with the protruding pin 53, the roller 10 is immediately stopped. When the brake pedal 13 is released, the brake pedal lever 12 is returned to its original position by the coil spring 21. At this time, the pair of swing levers 3
1 and 35, the swinging lever 31 first returns to the solid line position in FIG. be done.

Next, FIG. 4 shows a second embodiment, in which the same parts as in the first embodiment are designated by the same reference numerals. In FIG. 4, a pair of swing levers 31 and 35 are connected to
3a and 37a are connected to the brake pedal lever 12 so that the opening angles thereof are somewhat small. The degree of opening is set so that the operating lever 4 does not come into contact with the protruding pin 51 of the driven lever 50, which is swung when the operating lever 4 is switched to the forward or reverse position within the range used in normal work. Further, the turnbuckle 44 is mounted so as to be substantially vertical when the brake pedal lever 12 is at rest. In the emergency stop device of the second embodiment constructed in this manner, even when the operating lever 4 is swung back and forth during normal work, the protruding pin 51 comes into contact with the contact portions 33a and 37a as in the first embodiment. I will never come into contact with you. Note that when the operating lever 4 is swung to the maximum forward speed position, for example, the protruding pin 51 of the driven lever 50 comes into contact with the contact portion 33a of the swiveling lever 31 and rotates it together, but the links 41, 42 Since the connecting portion 43 is rotated in the direction of arrow C in the figure, the brake pedal lever 12 remains stationary.
When the operating lever 4 is swung to the maximum backward speed position, the connecting portion 43 is rotated in the direction of arrow D in the figure, and the same state is maintained. Even when the connecting portion 43 is rotated in this manner, if the brake pedal 13 is depressed, the protruding pin 51 of the driven lever 50 can be positioned in the same manner as described above. Next, FIG. 5 shows a third embodiment, in which the same parts as in the first embodiment are indicated by the same reference numerals and affixed with "A". In FIG. 5, a pair of swing levers 31A,
35A is configured to rotate below the control shaft 3A, so that the protruding pin 51A and the protruding pin 53A of the driven lever 50A are directly below the control shaft 3 when the operating lever 4 is at the stop position N. It is set. This also allows the same effect as described above to be achieved.

Effects of the invention As described above, in the present invention, the driven lever is fixed to the control shaft, and the fitting holes provided in the pair of swinging levers are respectively fitted in a rotatable manner. an engaging portion is provided, and each of the pair of swing levers is provided with an abutting portion that can be engaged with the engaging portion;
One end of the link is rotatably connected to a pair of swing levers, the other end of the link is rotatably connected to each other, and the connected portion is connected to the brake pedal lever via a connector. The frame is provided with a positioning stopper that stops the rotation of the swing lever at a position where the contact parts of the pair of swing levers come into contact with the engagement part of the driven lever when the operating lever is in the stop position. Therefore, when an emergency stop is required while the roller is running, by depressing the brake pedal until the rotation of the brake pedal lever stops, the engagement part of the driven lever can be reliably positioned at one point, making it easy to operate. The lever can be brought exactly to the stop position. In addition, the engaging part of the driven lever is engaged with the abutting part by the rotation of the pair of swinging levers when the brake pedal is depressed, so that the swinging motion occurs when the operating lever swings back and forth. The engaging portion of the lever can be set so that it does not always come into contact with the abutting portion within an appropriate swing range in which the operating lever is frequently switched, thereby improving the smoothness of the operating lever. . In addition, when adjusting the installation of the stop device of the present invention, the swing lever should be adjusted at a position where the abutting parts of the pair of swing levers contact the engaging part of the driven lever when the operating lever is in the stop position. Since it is only necessary to adjust the mounting position of the positioning stopper so as to stop the rotation, the mounting adjustment during assembly can be easily performed. In addition, one end of the link was rotatably connected to the swing lever, the other ends of the links were rotatably connected to each other, and the connected portion was connected to the brake pedal lever via a connector. Therefore, the pedal force increases at the position where the pedal is depressed, and therefore the feeling is almost the same as when the brake pedal of a normal car is depressed.

[Brief explanation of the drawing]

Fig. 1 is a front view of the emergency stop device, Fig. 2 is a partially sectional side view of the device, Fig. 3 is an overall view of the rolling compaction machine, and Figs. 4 and 5 are different embodiments. It is a front view of the emergency stop device of. DESCRIPTION OF SYMBOLS 1... Frame, 3... Control axis, 4... Operation lever, 6... Hydraulic drive operating device, 12... Brake pedal lever, 13... Brake pedal, 24
... Stopper, 31, 35 ... Swing lever, 3
2b, 36b...fitting hole, 33a, 37a...contact part, 41, 42...link, 43...connection part,
44...Turnbuckle (connecting tool), 50...Followed lever, 51...Protruding pin (engaging portion), 53...
...Protruding pin (positioning stopper), N...stop position.

Claims (1)

[Scope of utility model registration request] A braking device that pivots a brake pedal lever to a frame so as to be able to swing up and down, urges the lever upward to contact a stopper, and mechanically brakes a driving wheel by pressing the brake pedal;
A hydraulic drive type that has a control lever fixed to a control shaft that is rotatably supported on a frame, and a hydraulic drive device that controls the drive by rotating the control shaft by the back and forth rocking of the control lever. In rolling machines,
A driven lever is fixed to the control shaft, and a pair of swinging levers are rotatably attached to the control shaft, an engaging part is provided on the driven lever, and a pair of swinging levers is provided with an engaging part located on both sides of the engaging part on the pair of swinging levers. A contact portion that can be engaged with the engaging portion is provided, one end of each link is rotatably connected to the swing lever, and the other ends of the links are rotatably connected to each other. and the connecting portion thereof is connected to the brake pedal lever via a connecting tool so that the abutting portions of the pair of rocking levers swing toward the engaging portion when the brake pedal is depressed, and further The frame is provided with a positioning stopper that stops the rotation of the pair of swing levers at a position where the abutting part of the pair of swing levers contacts the engagement part of the driven lever when the operating lever is set to the stop position. An emergency stop device for a hydraulically driven compaction machine, characterized by: