JPH0213564Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed to prevent collisions with the boom or members attached to it as the boom rises, so that it can be operated easily and efficiently even in places where it is inconvenient if the boom rises too high, such as in an orchard. Accordingly, a contact sensor that swings around an axis substantially parallel to the boom vertical swing axis is installed on the side of the machine that supports the boom, and a contact sensor that swings around an axis substantially parallel to the boom vertical swing axis is installed on the machine side that supports the boom, and a contact sensor is installed on the control valve of the hydraulic cylinder that swings the boom up and down. the contact sensor by a mechanical interlocking mechanism configured such that as the sensor swings by the boom, the control valve is operated from a boom raising operation position to a stop position against human operation force; This invention relates to improvements in boom elevation limiting devices for linked work vehicles.

The object of the present invention is to enable the above-mentioned contact sensor to be easily and quickly changed between an active position in which it contacts the boom or a member attached thereto and a non-active position in which it does not contact, and to ensure that the contact sensor is in the desired operating position. The aim is to improve the mounting structure of the contact sensor so that it can be easily set.

A characteristic configuration of the boom rise limiting device according to the present invention is that in the above-mentioned work vehicle, the contact sensor and the interlocking member that transmits the operation of the contact sensor to the mechanical interlocking mechanism are rotated about the substantially parallel axis. The contact sensor and the interlocking member are freely provided, and the contact sensor and the interlocking member are engaged with each other on opposing surfaces to provide resistance to relative rotation between the contact sensor and the interlocking member. a removably configured engaging portion; further provided is a spring that urges the contact sensor and the interlocking member to slide relative to each other in a direction to maintain the engaged state of the engaging portion; is, within the swinging range of the boom, an active position where the boom contacts the boom or the attached member, and a non-working position where the boom is retracted outside the swinging range, against the biasing force of the spring. The structure is such that the engagement position with respect to the interlocking member can be changed freely by disengaging the engagement portion, and its effects are as follows.

In other words, by simply sliding the contact sensor and the interlocking member relative to each other against the spring, disengaging the engagement portion, and rotating the contact sensor relative to the interlocking member, the contact sensor can be moved to the boom or It is possible to switch between a boom lifting stop working position where the boom comes into contact with the attached member and a non-working position where the boom does not come into contact with the attached member, and the switching operation can be performed extremely easily. When the contact sensor comes into contact with the boom or a member attached thereto at the boom raising stop action position, the contact sensor and the interlocking member swing together, and the operation is controlled by the mechanical The signal is transmitted to the control valve operating mechanism via the interlocking mechanism, and the control valve is switched from the boom raising operating position to the stop position.

In addition, when setting the contact sensor to the boom raising stop action position, the contact sensor can be reliably and easily set at the desired position by using the engaging part, and overall it is convenient and easy to operate and handle accurately. We are now able to provide a boom lift limiting device.

Next, an embodiment will be shown with reference to FIGS. 1 to 3.

As shown in FIG. 1, a backhoe device such as a boom 3a is attached to this machine, which is constructed by attaching a swivel base 6 equipped with a boarding and driving section 4 and a driving section 5 to a crawler type traveling device 2 equipped with a dozer device 1. 3 is attached to form an earthwork vehicle capable of excavation work and soil removal work.

As shown in FIGS. 2 and 3, the boom 3a of the backhoe device 3 is attached to a swing bracket 7 to which the boom 3a is vertically swingable.
Install a support shaft 8 having an axis P ₂ almost parallel to P ₁ ,
A contact sensor 10, which swings when the roll 10a hits a member 9 attached to the boom 3a as the boom 3a rises, is rotatably and slidably attached to the support shaft 8, and the operation of the contact sensor 10 is controlled mechanically. The contact sensor 10 and the interlocking member 11 are rotatably attached to the support shaft 8 of an interlocking member 11 that transmits information to the interlocking mechanism.
an engaging portion configured to engage with each other to provide resistance to relative rotation between the contact sensor 10 and the interlocking member 11, and to be configured to be freely engaged and disengaged as the contact sensor 10 and the interlocking member 11 slide relative to each other. 12, and further includes the engaging portion 12.
the contact sensor 1 in the direction of maintaining the engaged state.
0 and the interlocking member 11 to slide relative to each other, and the contact sensor 10 has an action of coming into contact with the boom 3 or the attached member 9 within the swinging range of the boom 3a. The interlocking member 1 is moved to the position A and the non-operating position B, which is retracted outside the swinging range, by disengaging the engaging portion 12 against the biasing force of the spring 13.
The engagement position with respect to 1 can be changed freely.

Therefore, in the boom raising stop working position,
When the contact sensor comes into contact with the boom or a member attached thereto, the contact sensor and the interlocking member swing together, and the operation is controlled by the control valve operating mechanism via the mechanical interlocking mechanism. The control valve is switched from the boom raising operation position to the stop position.

When configuring the contact sensor 10, a bolt 10b
is screwed into the mounting nut 10c and fixed with the lock nut 10d, so that the distance between the roll 10a and its swing axis _P2 can be finely adjusted, and the contact sensor 10 using the engaging part 12 The configuration is such that the boom elevation limit angle θ ₂ can be changed and set in cooperation with the change of the relative fixed angle θ ₁ of the interlocking member 11.

In order to automatically stop the rising of the boom 3a as the contact sensor 10 swings due to the contact with the attached member 9 to the boom 3a, a lever 14 mechanically linked to the control valve V of the hydraulic cylinder C for vertical swinging of the boom is activated. A rotating shaft 16 is provided on the attached control post 15, and the lower end sides of the interlocking member 11 and the rotating shaft 16 are connected to the crank arm 17 and the interlocking member 11 and the crank arm around the swing axis _P3 of the swing bracket 7. A crank arm 19 connected to the upper end side of the rotating shaft 16 is interlocked via a rotary joint 18 that allows rotation of the lever 14 and the control valve V. Therefore, when the boom 3a is raised, the contact sensor 10
When the control valve V is swung by the connecting member 9 to a, the control valve V is operated from the boom raising operation position to the stop position against the human operation force applied to the lever 14.

Next, another example will be shown.

The specific structure and mounting structure of the contact sensor 10 can be changed as appropriate, and the contact sensor 10 can be attached to the boom 3.
It may be arranged and formed so as to be in contact with a itself.

The interlocking member 11 may be configured to slide relative to the contact sensor 10 to engage and disengage the engaging portion 12, and the mounting structure of the interlocking member 11 may be modified as appropriate.

The structure for mechanically linking the contact sensor 10 to the control valve V for boom operation can be variously modified, such as a rod type or a release wire type, and these structures are collectively referred to as a mechanical interlocking mechanism.

The structure of the engaging portion 12 can be freely changed to, for example, a chrysanthemum type, a pin engagement type, or the like.

The type and model of the work vehicle does not matter.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of a working vehicle, FIG. 2 is a side view of the main part, and FIG. 3 is a plan view of the main part. 3a...boom, 9...members attached to the boom,
10... Contact sensor, 11... Interlocking member, 12
...Engagement part, 13...Spring, C...Hydraulic cylinder, V...Control valve, _P1 , _P2 ...
... Axis center, A... Working position, B... Non-working position.

Claims (1)

[Scope of utility model registration request] The contact sensor 10, which is swung around an axis _P2 substantially parallel to the boom vertical swing axis P1, by the boom 3a or the member ₉ attached thereto as the boom 3a rises, is moved to the boom 3a. The contact sensor 10 is attached to a control valve V of a hydraulic cylinder C that is provided on the side of the machine that supports the boom 3a and swings the boom 3a up and down. The contact sensor 10 and the contact sensor 1 are connected to each other by a mechanical interlocking mechanism configured to operate the V from the boom raising operation position to the stop position against human operation force.
An interlocking member 11 that transmits the operation of 0 to the mechanical interlocking mechanism is provided to be rotatable around the substantially parallel axis _P2 , and on opposing surfaces of the contact sensor 10 and the interlocking member 11, mutually An engaging portion 12 is provided that engages with the contact sensor 10 to provide resistance to relative rotation between the contact sensor 10 and the interlocking member 11, and is configured to be freely engaged and disengaged as the contact sensor 10 and the interlocking member 11 slide relative to each other. A spring 13 is provided that urges the contact sensor 10 and the interlocking member 11 to slide relative to each other in a direction to maintain the engagement state of the joint portion 12, and the contact sensor 10 is configured to move within the swinging range of the boom 3a. , the boom 3 or the attached member 9
The interlocking member 11 is moved to the working position A where it comes into contact with the oscillation range and the non-working position B where it is retracted outside the swinging range by disengaging the engaging portion 12 against the biasing force of the spring 13. A boom lifting restriction device for a work vehicle, which is configured to freely switch the engagement position for the work vehicle.