JPH0789769B2 - Position adjustment device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a position adjusting device used for adjusting the length of a rear two-wheel holder in a rotary cultivator and the like.

(Prior Art) The front ends of a pair of left and right support pipes are vertically movably connected to a machine frame of a cultivator that is connected to a tractor as a rear two-wheel holder in a rotary cultivator for a tractor. The pipes are connected to each other by a horizontal rod and are substantially H in plan view.
The tail wheel support having two rear wheels at both left and right ends and a hitch metal fitting at the center in the left and right direction is inserted into the support pipe as a nesting structure so as to be movable and adjustable in the pipe longitudinal direction. It has an insertion rod, a plurality of pin insertion holes are formed in the insertion rod at appropriate intervals in the axial longitudinal direction, and either the pin insertion hole formed in the support pipe or the pin insertion hole of the insertion rod is formed. It was supposed to be fixed by a pin with a head that inserts through.

(Problems to be Solved by the Invention) However, according to the position fixing method by inserting the headed pin, the beta pin attached to the insertion end side of the headed pin for retaining is removed at the time of position adjustment, and then the headed pin is attached. Remove the pin from each pin insertion hole, adjust the position of the support pipe and the insertion rod to match each pin insertion hole, then insert the headed pin again and fix it with the beta pin. I was making adjustments. Therefore, attachment and detachment of the beta pin and alignment of the pin insertion holes between the support pipe and the insertion rod are troublesome, and there is a drawback that adjustment takes time.

In view of the above problems, it is an object of the present invention to provide a position adjustment work that is easy.

(Means for Solving the Problem) The technical means includes an outer cylinder 15, an inner rod 22 fitted in the outer cylinder 15 so as to be movable in the axial direction, and an outer cylinder 15 and an inner rod 22. In a position adjusting device including a lock mechanism 40 that is releasably fixed, the lock mechanism 40 is made of a spring material that is bent and formed into a substantially U shape, and both ends of the lock mechanism 40 are in an expanded shape. Support holes 29 formed on both sides of the outer cylinder respectively
An operating lever 33 supported to be capable of swinging forward and backward, and a supporting hole connected to at least one end of the operating lever 33.
A lock pin 35 protruding from the outer cylinder 15 in a retractable manner and selectively locked in a plurality of locking holes 39 formed apart from each other in the axial direction of the inner rod 22, and the lock pin 35 side. The operating lever 33 includes a cam body 32 provided on the outer surface of the outer cylinder 15 so that the inner surface of the end portion of the operating lever 33 is slidably contacted with the operating lever 33. An outer cylinder in which the end portion of the operation lever 33 is operated to move toward and away from the outer surface of the outer cylinder 15 by the relative sliding in order to project into the cylinder 15 or retract from the outer cylinder.
The cam surface 38, which is an inclined cam surface 38a inclined with respect to the axial direction of 15 and a holding cam surface 38b that holds the operation lever 33 at a position of the lock pin 35 retracted from the outer cylinder 15, is formed by the cam body 3
The point is that it is formed in 2.

(Operation) According to the present invention, from the fixed state in which the lock pin 35 is locked across the support hole 29 of the outer cylinder 15 and the locking hole 39 of the inner rod 22,
When the operation lever 33 is swung in the opposite direction to the release direction, the inner surface of the end portion of the operation lever 33 is slid and guided along the inclined cam surface 38a of the cam body 32, and the operation lever 33 is resisted against the elastic force. The end portion of is further expanded and pushed in a direction away from the outer surface of the outer cylinder 15. The pushing of this end causes the lock pin 35 to retract from the inside of the outer cylinder 15, the locked state of the lock pin 35 and the locking hole 39 is released, and the inner rod 22 moves in the axial direction with respect to the outer cylinder 15. Adjustable. At this time, hold the end of the operating lever 33 on the holding cam surface 38b.
If it is located at, it will be held in the unlocked state.

Then, after adjusting to the desired position, the operation lever 33 is oscillated to the fixed side to move from the holding cam surface 38b to the inclined cam 38a, and the elastic return force of the operation lever 33 causes the inclined cam surface 38b.
Slide along a and move in a direction to reduce the distance between both ends. Then, if the support hole 29 and the locking hole 39 are aligned with each other, the elastic return force of the operating lever 33 causes the lock pin 35 to slide in the direction in which the distance between the both ends is further shortened, and the lock pin 35 moves between the support hole 29 and the locking hole 39. A fixed state is obtained that is locked across.

(Example) Hereinafter, a first example of the present invention will be described with reference to the drawings.
1 to 7, reference numeral 1 denotes a rotary cultivator, which is connected to a tractor (not shown) so as to be able to move up and down by a three-point link or the like.

In the illustrated example, the cultivating unit 2 exemplifies a forward and reverse switchable unit.

3 is a power receiving case, which is located at the center in the left-right direction,
From this, a pair of left and right support arms 4 project outward to form a machine frame 5.

A side transmission case 6 and a support plate are provided below the outer end of the support arm 4, and the pawl shaft of the tiller 2 is supported below the both sides.

8 is a cover device for covering the cultivating part 2,
At least a fixed front cover 9 and a rear cover 10 movably connected to the front cover 9 are provided.

The rear cover 10 is a pair of left and right coil spring lowering mechanisms 13,
It is urged toward the ground, and its elastic force can be adjusted.

Reference numeral 14 is a rear two-wheel holder adopting the present invention, and the front ends of a pair of left and right support pipes 15 as outer cylinders are pivotally attached to the machine frame 5 by connecting portions 16 such as bolts so as to be vertically movable.

The support pipe 15 is connected to each other at a rear end side thereof with a horizontal rod 17 made of pipe material to have a substantially H-shaped plane, and the horizontal rod 17 and a top mast 18 on the machine frame 5 side are connected with a plowing depth adjusting body 19. ing.

The tail wheel support 20 includes a horizontal rod 21 and an insertion rod as a pair of left and right inner rods.
22. The tail rods or rear two wheels 24 of the caster structure are provided at the left and right ends of the horizontal rod 21 via the support shafts 23, and the hitch metal fittings 26 having the mounting holes 25 are provided at the center. .

Here, the insertion rod 22 is inserted from the rear end side insertion port 27 of the support pipe 15, and both are in the longitudinal direction of the pipe 15 due to the nested structure.
That is, the movement is adjustable in the axial direction.

Concentric support holes 29 are formed in the rear end portions of both support pipes 15 on both sides in the radial direction in the left-right direction, and a cylindrical guide cylinder 30 is fitted in one of the support holes 29. As a cylindrical cam body having a support hole 31 concentric with the support hole 29 and having the same diameter as the support hole 29 on the outer surface side of the other support hole 29.
32 is provided in a protruding shape by welding or the like.

Reference numeral 33 is an operating lever made of a spring material, which is formed into a substantially U-shape by bending, and one end side thereof is a shaft portion 34 which is bent inward, and a shaft center in the left-right direction is provided in the guide cylinder 30. It is pivotally supported so that it can rotate relative to it. Further, the other end side is fitted into a radial fitting hole 36 of a cylindrical lock pin 35, and is formed in a retaining shape by a roll pin 37 or the like. The lock pin 35 supports the support hole 31 of the cam body 32 and the support pipe 15. The hole 29 is pivotally supported so as to be relatively rotatable about the axis in the left-right direction. This operating lever
In the mounted state of 33, both ends of the operating lever 33 are mounted in a slightly expanded state against the elasticity. Here, the operation lever 33 is supported so as to be capable of swinging forward and backward about the axis of each support hole 29. Also, the end surface of the cam body 32 on the protruding end side is the cam surface.
38, and an inclined cam surface 38a inclined with respect to the axial direction of the support pipe 15 and a holding cam surface 38b parallel with the axial direction of the support pipe 15, as shown in FIGS. The forward and backward swing of the operating lever 33 causes the inner surface of the end portion of the operating lever 33 to slide relative to the inclined cam surface 38a, and the end portion of the operating lever 33 with respect to the outer surface of the support pipe 15. Perspective operation. The lock pin 35 is moved in the axial direction of each support hole 29 in association with the perspective operation of the end portion of the operation lever 33, and the lock pin 35 projects into the support pipe 15 in a locked posture (solid line position in FIG. 1). Then, the posture can be changed to the release posture (the phantom line position in FIG. 1) retracted from the support pipe 15. If the end of the operating lever 33 is positioned on the holding cam surface 38b, it is held in the released posture. The holding cam surface
38b may be formed in a concave shape.

On the other hand, a plurality of locking holes 39 are formed in the side surface of the insertion rod 22 corresponding to the side from which the lock pin 35 projects so as to be separated from each other in the axial direction, and each locking hole 39 is selectively locked. Can be locked.

Here, support pipe 15 with operating lever 33, lock pin 35, etc.
And a lock mechanism (40) for fixing the positions of the insertion rod (22) and the insertion rod (22).

A rattling prevention mechanism 43 is provided on the lower surface side of the rear end of each support pipe 15.
The play prevention mechanism 43 is provided with a support pipe.
15 U-shaped pedestal 44 fixed to the outer surface by welding, etc.
A bolt 46 screwed into a nut 45 fixed to a 44 is provided with a non-metal shoe body 47 made of a resin material such as 6.6 nylon and rotatably connected to an end portion of a bolt 46, and the bolt 46 is screwed. The shoe body 47 is supported by the opening 48 of the support pipe 15 by the support pipe.
The outer surface of the insertion rod 22 can be pushed and adjusted to the other by projecting into the inside of 15. 49 is a lock nut. Usually support pipe 15
The insertion rod 22 is made of an iron pipe, and noise can be reduced by the contact between the iron and non-metal, smooth relative movement can be prevented, and damage can be prevented.

It should be noted that the horizontal rod 21 has a cylindrical tube holder at both ends in a vertical posture.
50 is provided, the support shaft 23 is inserted into the cylinder holder 50 in a height adjustable manner, and the same locking mechanism 40a as described above is also adopted between the cylinder holder 50 and the support shaft 23. There is. Further, a mark 51 corresponding to each locking hole 39 is engraved on the upper surface side of the insertion rod 22, and the support hole 29 and the locking hole are provided at a position where the rear end edge of the support pipe 15 and the mark 51 are aligned with each other. 39 is configured to match.

FIG. 8 shows a second embodiment of the present invention, which has a structure in which the cam body 32 and the lock pin 35 are provided on both sides of the operation lever 33. The cam body 32 may have a structure having a hole portion having a diameter larger than that of each support hole 29.

(Effects of the Invention) According to the present invention, an outer cylinder, an inner rod fitted in the outer cylinder so as to be adjustable in axial movement, and a lock mechanism for releasably fixing the outer cylinder and the inner rod. In the position adjusting device including the lock mechanism, the lock mechanism is made of a spring material bent into a substantially U shape, and both end portions thereof are formed in an expanded shape and both end portions thereof are formed on both sides of the outer cylinder, respectively. An operating lever, which is supported in the support hole so as to be swingable forward and backward, is connected to at least one end side of the operating lever, and protrudes into and out of the outer cylinder from the support hole and is separated in the axial direction of the inner rod. The cam body provided on the outer surface of the outer cylinder so that the lock pin selectively locked in the plurality of locking holes formed by the above and the inner surface of the end portion of the operation lever on the lock pin side slidably contact each other. The lock pin does not protrude into the outer cylinder when the operating lever swings forward or backward. In addition, in order to retract from the inside of the outer cylinder, the operation lever end is operated to move toward and away from the outer surface of the outer cylinder by the relative sliding operation. A cam surface formed of a holding cam surface that holds the operation lever at a position retracted from the inside is formed on the cam body, and if the operation lever is rocked to the release side opposite from the fixed position, The lock pin retreats from the inside of the outer cylinder, the locked state between the lock pin and the locking hole is released, and the inner rod can be moved and adjusted in the axial direction with respect to the outer cylinder. And after adjusting it to some extent, if you swing the operation lever to the fixed side,
At a position where the support hole and the locking hole are aligned with each other, the lock pin is guided by the inclined cam surface by the elastic restoring force of the operating lever, and the lock pin projects into the outer cylinder and locks in the locking hole. By swinging the operating lever in this way to move the inner rod, the lock pin can be automatically locked and fixed in the locking hole at the position where the support hole and the locking hole match, and the position adjustment Work can be performed easily and easily.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part showing a first embodiment of the present invention, FIG. 2 is an enlarged plan view of the main part, FIG. 3 is a sectional view taken along the line III-III in FIG. 1, and FIG. Fig. 2 IV-IV line view, Fig. 5 Fig. V
-V line sectional view, FIG. 6 is a side view of the entire rotary tiller, FIG. 7 is a perspective view of an essential part of the rear two-wheel holder, and FIG. 8 is a plan view of an essential part showing the second embodiment. . 15 …… Support pipe, 22 …… Insertion rod, 29 …… Support hole, 32…
… Cam body, 33 …… Control lever, 35 …… Lock pin, 38…
… Cam surface, 38a …… Inclined cam surface, 38b …… Holding cam surface, 39
...... Locking hole, 40 ...... Lock mechanism.

Claims (1)

[Claims] 1. An outer cylinder (15), an inner rod (22) fitted in the outer cylinder (15) so as to be adjustable in axial movement, an outer cylinder (15) and an inner rod (22). Locking mechanism (4
0) and the lock mechanism (40) is made of a spring material bent into a substantially U shape,
The operation lever (33) and the operation lever (33) are supported such that they can be swung forward and backward in support holes (29) formed on both sides of the outer cylinder so that both ends are expanded. ), And a plurality of locking holes formed so as to project from the support hole (29) into and out of the outer cylinder (15) and spaced in the axial direction of the inner rod (22). The outer surface of the outer cylinder (15) so that the lock pin (35) that is selectively locked to the (39) and the inner surface of the end portion of the operation lever (33) on the lock pin (35) side can relatively slidably abut. The cam body (32) provided on the
In order to project the lock pin (35) into the outer cylinder (15) or retract it from the outer cylinder by forward or reverse swing of the operation lever (33), the end portion of the operation lever (33) is moved by the relative sliding. An inclined cam surface (38a) that is inclined with respect to the axial direction of the outer cylinder (15) that is operated to move toward and away from the outer surface of the outer cylinder (15), and a position where the lock pin (35) is retracted from the inside of the outer cylinder (15). A position adjusting device, wherein a cam surface (38) including a holding cam surface (38b) for holding the operation lever (33) is formed on the cam body (32).