JPS63317002A - Apparatus for controlling spring force in agricultural working machine - Google Patents

Abstract

PURPOSE:To enable safe control of a spring force with small operation force, by fitting a spring shoe member to a rod and providing the inside of the spring shoe member with a locking member which can be freely engaged or disengaged to a recess and with a spring to press the locking member in the radial direction of the rod. CONSTITUTION:A recess 16 is formed at a part of the circumference of a supporting rod 12 at the holding part D. A spring shoe member 17 to hold and support the lower end of a coil spring 15 is fit to the supporting rod 12 in a such as manner as to be freely slidable along the axial direction and freely rotatable along the circumferential direction of the rod. The spring shoe member 17 contains a spherical locking member 18 which can be freely engaged to or disengaged from the recess 16 and a spring 19 to press the locking member 18 toward the inside of the supporting rod 12 along the radial direction. Accordingly, only the part of the spring shoe member 17 containing the spring 19 is radially protruded from the rod and the protruded part 20 is used as a manually operating part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for adjusting a biasing force used, for example, when biasing a rear cover downward in a rotary tiller. and a fixed part, and a coil spring externally fitted on the rod between each part elastically biases the movable part in a direction away from the fixed part. It relates to a force adjustment device.

[Prior Art] As the conventional adjusting device, for example,
As shown in Japanese Patent No. 1-154703, a plurality of through holes are formed in the axial direction of the loft, a heater pin or the like is attached to one of the through holes, and a spring receiving piece is brought into contact with the pin. The movable part, such as the rear cover, is biased downwardly at the lower end of the rod, and the biasing force is adjusted by changing the mounting position of the pin.

(Problems to be Solved by the Invention) However, in the conventional structure described above, it is troublesome to attach and detach the beta pin, and the beta pin may be dropped in the field and lost during attachment and detachment.

An object of the present invention is to solve such problems and to make it possible to extremely easily adjust the biasing force of a coil spring to a movable part.

Means for Solving Problem C] The present invention is characterized in that, in the urging force adjustment device for an agricultural working machine having the above configuration, a plurality of notched recesses are provided in a part of the circumferential direction of the rod and along the axial direction. A spring receiving member for receiving and supporting one end of the coil spring is externally fitted into the loft so as to be able to move in R1 and rotate freely, and a lock that can be freely engaged and detached from the notch recess is provided inside the spring receiving member. The locking member is provided with a spring that biases the locking member radially inward of the rod to engage the locking member in the notch recess, and its functions and effects are as follows.

[For production]

Since a lock member is inside the spring receiving member and a spring is inscribed on the radially outward side of the rod of this locking member, this spring interior portion protrudes radially outwardly, so that the operator cannot The spring receiving member can be rotated using this protruding portion as an operating grip portion. Then, the locking member that engages in the notch recess rides on the circumferential surface of the rod from the notch recess according to the rotation, and while they are in point or line contact, the spring receiving member is slid in the rod axis direction. The coil spring is received and the movable part is spring biased by dynamically displacing the spring receiving member and preventing the spring receiving member from displacing in the axial direction with the locking member being engaged in the notch recess at the position to be adjusted. be.

[Effects of the Invention] As a result, the rotation of the spring receiving member when the locking member is engaged with and disengaged from the notch recess is achieved by increasing the distance from the center of rotation to the point of force application by utilizing the protruding portion. This can be done with a small rotational operation force, and since the locking member and the rod come into point or linear sliding contact during sliding displacement in the direction of the rod axis, the frictional resistance between them is small and the sliding movement is smooth. The dynamic operating force only needs to be small. Therefore, it is now possible to adjust the biasing force with a small amount of operating force, and moreover, safely.

〔Example] Embodiments of the present invention will be described below based on the drawings.

As shown in Fig. 4, a low tillage device (
2) are connected to each other so that they can be raised and lowered to form an agricultural machine.

The rotary tiller (2) transmits power from the machine body (1) via a power take-off shaft (3), and further transmits power to a plurality of tiller claws (5) via a transmission case (4) on the side. )・
The plowing work is performed by rotationally driving the machine body (1), and the entire machine is raised by a hydraulic cylinder (6) provided on the inside of the machine body (1) so that it can travel on the road.

Further, a rotary cover (7) is provided on the top of the tilling claw (5) to prevent scattering of the mud raked up by the tilling claw (5), and a horizontal shaft is attached to the rear end of the rotary cover (7). The rear cover (
8) is supported.

On the rear left and right sides of the tilling device (2), there are freely rotating tail wheels (
9), (9) is low-reframed (10), (
10) is supported at the lower end, and the vertical height of the tail wheels (9), (9) can be freely changed and adjusted by means of a handle (11), and the tail wheels (9), (9) have twenty tail wheels (9), (9). The plowing depth is adjusted by changing the relative height of the tail wheels (9), (9) and the plowing claws (5).

The rear cover (8) is biased downward by a biasing mechanism (B), which will be described later, in order to level the ground cultivated by the tilling claws (5), and also regulates the lower swing limit. There is. That is, as shown in FIGS. 1 and 2, the lower ends of the pair of left and right support opening throats (12), (12) are pivotally connected to the upper surface of the rear cover (8), and the support rods (12), (12) to the row reframe (10
), (10) fixed member (13), (
It is inserted into the insertion holes (14), (14) of (13) so as to be vertically displaceable, and holding parts (C), (D) are provided on the top and bottom, and the upper holding part (C) and the fixing member (13) )
The limit of downward swinging of the rear cover (8) is restricted by restricting contact with the rear cover (8). The support rod (12) is disposed between the fixing member (13) and the lower holding part (D).
A coil spring (15) is fitted externally to the lower holding part (D
) in the axial direction of the support rod (12), and by fixing the position, the coil spring (15
) is configured so that the urging force applied to the rear cover (8) can be adjusted.

The upper and lower holding parts (C) and (D) have the same configuration, and the lower holding part (D) will be explained below.

As shown in FIG. 1, in the holding portion (D), a notch recess (16) is formed in a part of the circumferential direction of the support rod (12).
The spring receiving member (17) that receives and supports the lower end of the coil spring (15) is connected to the support rod (12).
It is externally fitted so as to be slidable in the axial direction and rotatable in the circumferential direction. Inside the spring receiving member (17), there is a spherical locking member (18) that can be freely engaged and detached from the notched recess (16), and this locking member (18) is connected to the support rod (
A spring (19) is installed inside the spring (19) that urges the spring (12) inward in the radial direction. Therefore, this spring receiving member (17)
(19) Only the interior portion has a structure that protrudes outward in the radial direction, and this protrusion (20) can be used as a manual operation section.

A plurality of the notched recesses (16) are formed along the axial direction of the support rod (12), and when adjusting the spring biasing force, as shown in FIG. The bar 2 and the receiving member (17) are rotated in the circumferential direction as shown in FIG. 3 from the state in which they are engaged in the notch recess (16), and the locking member (18) is attached to the support rod (12). After it rides on the circumferential surface portion (21), it slides in the axial direction and engages in another notch recess (16).

Further, when the spring receiving member (17) is externally fitted onto the support rod (12), on the opposite side of the spring (19) disposed portion of the spring receiving member (17) with respect to the rod axis, An insertion hole (2L) is provided through which an operating tool for pressing the lock member (18) to the outer peripheral surface of the support rod (12) is inserted. A retaining pin (23) is provided near the upper free end of the support rod (12) to prevent the upper receiving member (17) from temporarily coming off.

The present invention is not limited to a rotary tiller, but can be applied to various agricultural machines, such as energizing a sensor float of a riding rice transplanter, for example.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the urging force adjustment device for an agricultural working machine according to the present invention, in which FIG. 1 is a cutaway front view of the main part, FIG. 2 is a cutaway front view of the upper part of the rod, and FIG. 3 is a locking member in a cutout recess. FIG. 4 is a side view of the entire Ll-chest cultivating device. (8)...Movable part, (12)...Rod, (13)...Fixed part, (15)...
・Coil spring, (16)...Notch recess, (17
)... Spring receiving member, (18)... Locking member.

Claims (1)

[Claims] A rod (12) extends between the movable part (8) and the fixed part (13).
), and a coil spring (15) externally fitted on the rod (12) between the respective parts (8) and (13) elastically moves the movable part (8) away from the fixed part (13). A biasing force adjustment device for an agricultural machine configured to bias the rod (12), wherein a plurality of notch recesses (16) are formed in a part of the circumferential direction of the rod (12) and along the axial direction. , a spring receiving member (17) that receives and supports one end of the coil spring (15) is fitted onto the rod (12) so as to be slidable and rotatable;
) is provided inside the rod (12) in the radial direction to engage and disengage the lock member (18) into the notch recess (16). A biasing force adjustment device for an agricultural working machine that is provided with a spring (19) that biases in one direction.