JPS6243383Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operation link device, particularly an operation link device suitable for use in a parking brake lever, and more specifically, one operation lever can be used in two different operation positions on the left and right by sandwiching the neutral position. The present invention relates to an operation link device that can be operated.

Conventionally, this type of operating linkage has required a holding device such as a click stop mechanism to position and hold the lever in the neutral position and each operating position. For this reason, not only does the cost increase by the amount of the holding device, but also because the holding device is generally held by the engagement and frictional force of an engaging member biased by a spring, the holding device portion is connected to other operating links. It wears out earlier than the device part, making maintenance troublesome, and the engagement and friction forces based on the holding device make operation difficult.

Therefore, in the present invention, connecting rods are connected to both ends of a plate that is interlocked with the operating lever via the fulcrum shaft, and the tips of these connecting rods are connected to the operated member respectively. When the operating lever is in the neutral position, the tips of both connecting rods are positioned at the working ends of the long holes, and the plate is engaged with the long hole of the connecting plate. It is an object of the present invention to provide an operating link device which is constructed so as to be able to rotate beyond the above-mentioned range, thereby eliminating the above-mentioned drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2, reference numeral 1 is a parking brake lever used in a work vehicle such as a combine harvester, and is fixed to a fulcrum shaft 3 rotatably supported by a frame 2. ) can be operated into parking position A and storage position B. Also,
A plate 5 is welded to the other end of the fulcrum shaft 3 approximately at its center, and connecting rods 6 and 7 are connected to both ends of the plate 5, respectively. A sleeve 9 is rotatably supported on the frame 2, and a shaft 10 is rotatably supported on the sleeve 9. The sleeve 9 and the shaft 10 form a double structure, and one end of the shaft 10 and the sleeve 9 each has a connecting plate 1
2 and 13, and arm 1 at the other end.
5 and 16 are welded. connection plate 12,
13, as shown in FIGS. 5 and 7, arc-shaped elongated holes 12a and 13a are formed with predetermined lengths centered on the rotation axes 10 and 9, respectively, and these elongated holes 12a, The ends of the connecting rods 6 and 7 are slidably engaged with the respective connecting rods 13a. Note that when the parking lever 1 is in the neutral position N, both of these connecting rods 6 and 7 are connected to the long hole 12.
It is set to be located at the upper end of a, 13a. On the other hand, the arms 15 and 16 are made of two plates, and pins 19 and 20 are provided at the tips of the arms 15 and 16, respectively, so as to be sandwiched between these two plates.
is supported. As shown in detail in FIG.
0a are in contact with and engage with each other. As shown in FIG. 5, the arm 15 has a long hole 15a formed at its tip, and a pin 19 is slidably supported in the long hole 15a. 20 is rotatably supported. Further, a main clutch rod 21 is fixed to the pin 19 by a nut, and a long hole 21a is formed at the tip of the rod 21.
a pin 2 provided on the main clutch pedal 22;
3 are slidably engaged. On the other hand, a brake rod 25 is fixed to the pin 20 with a nut, and the rod 25 is connected to the parking brake via a brake wire 26. In addition, reference numerals 27 and 28 in FIG. 1 are stoppers that abut the plate 5 beyond the consideration point to stably hold the lever 1 in the parking position A and the storage position B. Further, arrow F indicates the forward direction of the work vehicle.

Since this embodiment has the above-described configuration, when parking the vehicle, rotate the parking brake lever 1 from the neutral position N in the direction of arrow a to position it at the parking position A, as shown in FIG. do. Then, the plate 5 also rotates in the same direction via the shaft 3, moving the rod 6 downward as shown by arrow b and moving the rod 7 upward as shown by arrow c. Then, the tip of the rod 6 is inserted into the long hole 1 of the connecting plate 12.
The connecting plate 12 only slides downward from the upper end of the connecting plate 2a along the long hole 12a as shown by the arrow d, but the rod 7 engages with the upper end of the long hole 13a of the connecting plate 13. The connecting plate 13 is rotated in the direction of arrow e in order to move the tip further upward. Further, the rotation of the plate 13 causes the arm 16 to rotate in the direction of arrow f through the sleeve 9, and pulls the brake wire 26 in the direction of arrow g through the pin 20 and rod 25, thereby operating the parking brake. At the same time, as the pin 20 moves in the direction of the arrow f, the notch planes 19a, 2
Based on the contact of 0a, the pin 19 is also moved together,
The arm 15 is slid in the direction of the arrow h along the long hole 15a, and the main clutch rod 25 is further pulled, and the main clutch pedal 22 is rotated in the direction of the arrow i via the long hole 21a and the pin 23. The main clutch is disconnected.

When the vehicle is to be stored, the parking brake lever 1 is rotated from the neutral position N in the direction of arrow j to the storage position B, as shown in FIG. Then, the rod 6 is moved through the plate 5 in the direction of arrow k, and the rod 7 is moved in the direction of arrow l. As a result, the connecting plate 12 rotates in the direction of the arrow m based on the upward movement of the rod 6 located at the upper end of the elongated hole 12a.
The rod 7 located at the upper end of the connecting plate 13 only slides in the direction of arrow n along the elongated hole 13a, and the connecting plate 13 does not move. Therefore, due to the rotation of the connecting plate 12, the arm 15 rotates in the direction of arrow o via the shaft 10, and the elongated hole 15a of the arm 15 rotates.
The pin 19 located at the left end of the main clutch pedal 22 is rotated integrally with the arm 15, and the rod 21 is further pulled in the direction of the arrow p, and the main clutch pedal 22 is moved in the direction of the arrow i through the elongated hole 21a and the pin 23. direction, and the main clutch is disengaged. At this time, depending on the movement of the pin 19 in the direction of the arrow o based on the arm 15,
Since the cutout planes 19a and 20a of both pins 19 and 20 are separated, there is no effect on the pin 20 and therefore on the parking brake. This prevents the main clutch from sticking due to the disengagement of the main clutch, and also prevents the brake facing from sticking due to the parking brake being deactivated.

In addition, when the parking brake lever 1 is in the parking position A or the storage position B, the tension from the parking brake or the main clutch is acting on the plate 5 via the rod 6 or 7. , when the rod 7 is at the parking position A, the rod 7 crosses the fulcrum shaft 3, that is, the thinking point.
The tension acting on the rod 7 urges the plate 5 to rotate in the direction of arrow c, presses and contacts the stopper 27, and stably supports the lever 1 in the position A, and when it is in the retracted position B, When the rod 6 crosses the fulcrum shaft 3, the tension acting on the rod 6 urges the plate 5 to rotate in the direction of arrow k, presses and contacts the stopper 28, and stably supports the lever 1 at the position B. do. At this time, the other rod 7 or 6 is located on the idle side of the elongated holes 13a, 12a, and no tension is applied to it. And these parking positions A
Or, when the lever 1 is rotated beyond the fulcrum shaft 3 from the retracted position B, the lever 1 is returned to the neutral position N direction by the rod 6 or 7 on which the tension is applied.
At the neutral position N, the tips of both rods 6 and 7 are inserted into the long holes 12a and 1 of the connecting plates 12 and 13, respectively.
Based on being located at the action side (upper) end of 3a,
The tension forces from the rods 6 and 7 are balanced, or the tension forces from both rods 6 and 7 just stop acting, and the lever 1 is stably held in the neutral position.

Also, when the main clutch pedal 22 is depressed when the parking brake lever 1 is in the neutral position N, the pin 2
3 slides along the elongated hole 21a of the rod 21, and the operation of the pedal 22 is not hindered.

As explained above, according to the present invention, the connecting rods 6 and 7 are connected to both ends of the plate 5 that sandwich the fulcrum shaft 3, and the tips of these connecting rods are connected to the operated members 22 and 26, respectively. Long holes 12a, 13a of interlocking connecting plates 12, 13
and when the operating lever 1 is in the neutral position N, the ends of both connecting rods 6 and 7 are respectively inserted into the elongated holes 12.
a, 13a, and the plate 5 is configured to be able to rotate beyond the point based on both the connecting rods 6, 7, so that the operation lever 1 can be operated in one direction. In this case, one of the connecting rods 6 continuously pulls the connecting plate 12, while the other connecting rod 7 slides along the elongated hole 13 and does not continuously pull the connecting plate 13, so that one operation lever 1 can be used. Two different operations can be performed without any trouble, and the operating lever 1 can be stably held in the neutral position N and the two left and right operating positions A and B without the need for a special holding device. Therefore, it is possible to reduce costs, and there is no need to replace the holding device part due to wear.
Maintenance is easy, and since there is no frictional force from the holding device, the lever operation becomes easier.If the point of consideration is exceeded, the operating lever 1 is automatically returned to the neutral position N or the operating positions A and B, which prevents erroneous operation. can be prevented. Furthermore, if the operating lever is the parking brake lever 1, and the operated members are the parking brake 26 and the main clutch 22, one parking brake lever 1 can be used to operate the parking brake as well as to prevent the main clutch from sticking when retracted. There is no need for a special main clutch anti-sticking device, the structure is simple, and erroneous operations can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a front view of a link device showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line of Fig. 1, Fig. 3 is a perspective view showing the pin, and Fig. 4 shows the parking brake operating state. A front view of the operation link device, FIG. 5 is a side view showing the connection plate and arm part,
FIG. 6 is a front view of the operation link device in a stored state, and FIG. 7 is a side view of its connection plate. 1... Operation lever (parking brake lever), 3
...Fullin shaft, 5...Plate, 6,7...Connection rod, 12,13...Connection plate, 12a, 1
3a...Long hole, 22...Operated member (main clutch pedal), 26...Operated member (parking brake wire).

Claims (1)

[Claims for Utility Model Registration] (1) An operating lever is connected to a plurality of operated members via a fulcrum shaft, a plate, and a connecting rod, and each member is operated differently by operating the operating lever from the neutral position to the left or right. In an operation link device that can operate a member, connecting rods are connected to both ends of the plate that sandwich the fulcrum shaft, and the tips of these connecting rods are connected to the long holes of the connecting plate that are interlocked with the operated member. When the two connecting rods are engaged and the operating lever is in the neutral position, the tips of both connecting rods are located at the working ends of the elongated holes, and the plate can be rotated beyond the point based on the two connecting rods. Operational linkage device configured in . (2) The operating link device according to claim 1, wherein the operating lever is a parking brake lever, and the operated members are a parking brake and a main clutch.