JPH01179616A - Mower link device - Google Patents

Abstract

PURPOSE:To provide the title device so designed that when a mower is operated so as to be lowered, a cam plate rotates until a lift arm switch turns 'off' to stop the operation of a lift motor, thus preventing e.g. the breakage of a link mechanism caused by mower's thrusting up. CONSTITUTION:When a switch is continuously pushed 'down' to operate a mower so as to be lowered, a lift motor rotates continuously, a lift rod 13 being pushed forward against the pulling force of a balance spring 23. At this time, the rotation of a lift arm 16 is stopped due to the contact of the mower 2 with the ground, and a pin 14 at the tip of the lift rod 13 moves forward along the long hole 21 on the lift arm 16. Also a cum plate 20 at the pin 14 rotates with the fitted section 20a as the rotary support, a lift arm switch 19 turning 'off'.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mower that is attached to the lower part of a tractor or the like via a link mechanism so that it can be raised and lowered, and particularly when the mower is lowered and grounded. This invention relates to a mower link device for preventing damage to a lift mechanism due to thrusting of a mower due to the contact with the ground.

[Prior Art and Problems to be Solved by the Invention] Conventionally, a mower attached to the lower part of a tractor or the like via a link mechanism is raised and lowered by forward and reverse rotation of a lift motor. A switch for turning the lift motor on and off is provided on the tractor panel, but when turning on this switch to lower the mower, if the switch is kept pressed even after the mower has landed, The lower end of the elongated hole suddenly impacts the pin loosely fitted into the elongated hole provided in the link rod and pushes up, resulting in accidental damage to the lift mechanism including the link mechanism.

Therefore, a technical problem arises that must be solved in order to overcome this defect.

[Means for Solving the Problems] The present invention was proposed in view of the above-mentioned problems and aims to solve the above problems by connecting a mower suspended via a link mechanism to a lift motor. In the mower link mechanism formed to be able to move up and down freely in The lift arm at the contact portion is provided with a long hole in the direction of movement of the lift rod, a pin provided at the tip of the lift rod is loosely fitted into the long hole, and a pin provided at the tip of the lift rod is loosely fitted into the long hole. A hole for fitting the bottle is provided in the upper part of the cam plate pivotally attached to the lower part, and the pin is inserted thereinto, and a hole for sliding the bottle provided at the tip of the lift rod in the elongated hole is further provided. Another object of the present invention is to provide a mower link device characterized in that a lift arm switch that is turned on and off by the cam plate is provided, and a balance spring is stretched over the upper end of the lift arm.

[Operation] The lift rod protruding from the lift motor side in a substantially horizontal direction slides in the longitudinal direction of the tractor as the lift motor rotates forward and backward. Due to the longitudinal sliding movement of the lift rod, the linking rod coaxial with the lift arm rotates up and down using the shaft tube portion with the lift arm as a rotation fulcrum. Furthermore, the IJ link, which is pivotally supported at the tip of the connecting rod through a long hole, is lowered to raise and lower the mower. Therefore, when the mower is in the lifting position and the operator turns on the switch at hand to rotate the lift motor and lower the mower to the ground to perform mower work, the bottle at the tip of the lift rod is The lift rod moves forward while being pressed against the rear end of the elongated hole of the lift arm by the pressure of the balance spring. That is, due to the forward sliding movement of the lift rod, the lift arm is tilted forward at its upper part using the pivot point at its lower end as a pivot point (and is coaxial with the lift arm, and The tip of the connecting rod that is integrally connected to the lift arm also tilts downward, and the link rod that is supported by a bin fixed to the tip of the connecting rod also descends, causing the link rod to move downward. The mower, which is suspended from a frame pivotally supported at the lower end, descends and touches the ground.

At this time, if the lift motor is still rotating, the lift rod continues to slide forward, but since the mower is in contact with the ground, the rotation of the lift arm stops. Therefore, the pin fixed to the tip of the lift rod slides forward along the elongated hole of the lift arm. At this time, the cam plate into which the pin is inserted is tilted forward using the lower pivot portion as a pivot point. The lift arm switch is turned off by this number of operations, and the lift motor is stopped. Therefore, it is possible to prevent the lift device including the link mechanism from being damaged due to the thrust of the mower.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings. (1) is a tractor, and a mower (2) is suspended below the tractor (1) via a link mechanism (3). In addition, this mower (2) is operated by a PTO operating lever (4) provided near the driver's seat.
Operate the "man" and "off" buttons to perform mower work. Further, the mower (2) is raised and lowered by being provided on an operation panel (5) in the driver's seat or by turning on and off a switch (7) of a foot motor (6).

In the lift device of the mower (2), the lift motor (6) and the speed reducer (8) are first attached to a bracket (10) fixed to the judge (9), and then,
Arm 0 pivoted on the rotating shaft (I+) of this reducer (8)
A lift rod (2) is pivotally attached to the tip of 20. Furthermore, the tip of this lift rod (2) is attached to a tractor (
1), and slides back and forth in the forward direction of the tractor (1) by forward and reverse rotation of the lift motor (6). A bottle is fixed to the tip of the lift rod. Also, a bottle is fixed to the tip of the lift rod
A long hole (r7) drilled in the front-rear direction is provided at approximately the middle of the lift arm (119) whose lower end is pivotally connected to a bracket (IS) fixed to the Long hole (
r? ) is loosely fitted. Therefore, the lift rod (2
) The upper part of the lift arm (10) is rotated back and forth in conjunction with the sliding movement of the lift arm (16).Also, the switch mounting plate (edge Then, attach the lift arm switch (0) to this switch mounting plate (on the above-mentioned lift). arm(
It is pivoted to the IF9 (20a) L, and a hole (21) for the pin (14) is bored in its upper end, and the pin (VI) is inserted therein. Therefore, the pin (U) is inserted into both the elongated hole (21) and the insertion hole (21).Then, the pin (14) slides forward along the elongated hole (r7). When this happens, press the corresponding lift arm switch (0).
is immediately turned off and the lift motor (6) stops.

Also, the upper end of the lift arm (+6) and the judge (9)
) A balance spring (to) is interposed between the frame body fixed to the
) is biased to pull it backwards. The strength of the balance spring (2) is selected to be an appropriate value in relation to the mower (2), the link mechanism (3), and the lift motor (6).

Further, the lift arm (l[9 is connected to the pivot point) is pivoted. The link (to this link) extends substantially horizontally, and is integrated with the lift arm (1→) via the shaft attachment portion. The lift arm (Iff) can also be integrally molded with the guerrilla. Also, there is a pin (C) at the tip of this connecting rod (B).
is fixedly installed, and the pin (c) is loosely fitted into an elongated hole (6) drilled in the upper part of the link rod (1) in the elongated direction.

Furthermore, the lower end of the link rod (1) is attached to the mower (2).
It is pivotally attached to approximately the middle part of the frame (1) which is constructed in the front and rear of the two parts. Furthermore, a parallel link (291(a)) is pivotally attached to the front and rear ends of the frame (1) to constitute a link mechanism. When the mower (2) rotates, the connecting rod (2) also rotates, and the mower (2) moves up and down via the link rod (A) supported by the connecting rod (2). ing.

Note that the symbol (a) in the figure is a gauge wheel.

Since one embodiment of the present invention has the above-described configuration, the switch (7) provided on the operation panel (5) of the driver's seat is turned on and off to rotate the lift motor (6) in the forward and reverse directions. The mower (2) is moved up and down through the mechanism. First, when the mower (2) is on the ground, the lift arm (mower weight loaded on IF9), balance spring (g), and operation panel Hand switch (7)
: off, lift arm switch (n: off, soft motor (6): off (stop). Next, the mower (2)
) is operated from the lowered position to the raised position, mower weight > balance spring (c), operation panel hand switch (7): raised on, lift arm switch (gull: on, lift motor (6) nion (raised) Furthermore, when mower (2) is raised to MAX, mower weight > balance spring (c), operation panel hand switch (7): off (however, there is a safety device with thermal protection when it is on continuously) Lift arm switch (gull: on, lift motor (6): off (stop). Also, when operated from the up position to the down position, mower weight > balance spring (to), operation panel hand switch (7) ): Lowering is on, lift arm switch (gull: on, lift motor (6): is on (lowering direction). Furthermore, lowering is MIN.
, (Tailwheel landing), the balance spring (T)
When the weight of the mower increases, the operation panel hand switch (7) is turned on, and even if this lowering is on continuously, the lift arm switch (n is turned off, and therefore the lift motor (6) is turned off (stopped). .

In the above state, the pin (C) loosely fitted into the elongated hole (6) of the link rod (1) is always held in the elongated hole by the tension of the balance spring (C). It is pressed against the upper end. However, by operating the mower (2) from the up position to the down position and rotating the lift motor (6), the mower (
It is preferable that the lift motor (6) stops immediately when the lift motor (2) is lowered to the ground, but the operator may continue to press the operation panel switch (7) in the downward direction. In this case, since the lift motor (6) continues to rotate, the lift rod (2) is pushed forward against the tensile force of the balance spring (3). However, due to the grounding of the mower (2), the lift arm OQ
Since the simultaneous movement of is stopped, the bin OA provided at the tip of the lift rod (1) moves forward along the long hole (21) of the lift arm (10. At this time, the bin OA) At this point, the cam plate (A) also rotates about the pivot portion (20a), and the lift arm switch (C) turns off. Therefore, the problem of the mower (2) pushing up the bottle (C) that is loosely fitted into the long hole (6) of the link mechanism part (4) is completely eliminated, and damage to the link mechanism part can be avoided. It will be done.

In addition, when attaching and detaching each part of the mower (2), use the engine oil pressure switch (not shown) and other switches provided to lift the arm switch (which moves the mower (2) up and down regardless of the on/off operation of the seagull). is now possible.

[Effects of the Invention] As described in detail in the above embodiment, the present invention rotates the lift mower by operating the mower from the raised position to the lowered position, and when the mower lands, the lift arm is equipped with a The bottle fixed to the tip of the lift rod moves along the elongated hole, and the cam plate into which the bottle is fitted rotates using its pivot point as a rotation fulcrum.This movement causes the lift arm to move. The switch turns off and the lift motor stops. Therefore, it is now possible to prevent damage to the link mechanism due to the thrust of the mower, which has often occurred in the past.

It should be noted that the present invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that the present invention extends to such modifications.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, and FIG. 1 is an overall side view;
FIG. 2 is a side view of the link mechanism, and FIG. 3 is an enlarged side view of the main parts. Symbol ■ = Tractor 2: Mower 3: Link mechanism 6: Lift motor 7: Operation panel hand switch 10.15 Nibble bracket 13: Lift rod 14, 25: Bin 16: Lift arm 17, 27: Long hole 19: Lift arm switch 20: Cam plate 21: Fitting hole 23: Balance spring

Claims (1)

[Claims] In a mower link mechanism, in which a mower suspended from the lower part of a tractor, etc. via a link mechanism can be raised and lowered by a lift motor, the tip of the lift rod is slidably protruded from the motor side. , a lift arm whose lower end is pivotally connected to the bracket is brought into contact with the lift arm, and a long hole is provided in the lift arm at the corresponding contact portion in the sliding direction of the lift rod,
A pin provided at the tip of the lift rod is loosely fitted into the elongated hole, and a hole for the pin is provided in the upper part of a cam plate which is pivoted at the lower part of the elongated hole of the lift arm. Further, a lift arm switch is provided which is turned on and off by the cam plate in accordance with the sliding movement of the pin provided at the tip of the lift rod in the elongated hole. A mower link device characterized by having a balance spring stretched over the upper end of the mower link device.