JPH0455530A - Safety device of back hoe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a system in which the boom of a backhoe device has a proximal boom portion attached to a lateral side of an operating section of a swivel base, and a swingable portion of the proximal boom portion. It consists of an intermediate boom part that is movably connected, and a distal boom part that is swingably connected to the intermediate boom part and has an arm connected thereto, and the intermediate boom part is connected to the proximal boom part. The present invention relates to a safety device for a backhoe, which is provided with an offset cylinder that swings and adjusts the arm to move in the lateral direction of the swivel base with respect to the proximal boom portion.

[Conventional technology]

The above-mentioned backhoe is capable of pulling the backhoe device toward the revolving base and storing it by performing an offset operation of the arm, a raking side operation, and a raising operation of the boom. For this reason, it is possible to position the packet directly in front of the driving section.

Therefore, in this type of backhoe, conventionally, a boom angle sensor, an arm angle sensor, a packet angle sensor, and an offset angle sensor are provided as shown in, for example, Japanese Patent Application Laid-open No. 1-178621. A control means for automatically operating the control valve is provided so that when a packet approaches the driving part, the backhoe equipment operation is automatically disabled, making it possible to avoid the packet from coming into contact with or entering the driving part. There was something.

[Problem to be solved by the invention]

Conventionally, in addition to requiring a large number of sensors, a microcomputer was also required as a control means.Furthermore, since it was electrically controlled, it was necessary to take sufficient measures for waterproofing and dustproofing, which was disadvantageous in terms of structure. there were.

An object of the present invention is to provide the above-mentioned safety measures with a simple structure.

[Means to solve the problem]

In the safety device for a backhoe according to the present invention, the stopper for the arm is brought into contact with the arm that has been swung to the raking side at a set raking angle with respect to the tip side boom portion. an active position in which the arm protrudes toward the arm side; and a non-active position in which the rear end is located on the intermediate boom portion side in a state where the arm does not come into contact with the arm that has been swung to the set raking angle with respect to the tip side boom portion. The intermediate boom portion is provided with an operating cam portion that is slidably attached to the distal boom portion and acts on the stopper, and the stopper is slid as the intermediate boom portion swings with respect to the proximal boom portion. When the intermediate boom section is oscillated at a set offset angle toward the operating section with respect to the proximal boom section, the stopper is operated to the operating position and supported, and the intermediate boom section The operating cam portion is provided with a cam surface that operates the stopper to the non-operating position when the stopper is swung through the set offset angle to the side opposite to the operating portion with respect to the proximal boom portion. The functions and effects thereof are as follows.

[For production]

When the backhoe device is operated so that the packet approaches the drive unit to the permissible limit, the scraping swing angle of the arm relative to the boom is set as the set scraping angle, and in that case, the proximal boom portion of the intermediate boom portion The offset swing angle relative to the set offset angle is set as the set offset angle. Then, when adjusting the offset of the arm to the side opposite to the driving part, such as when storing the backhoe equipment, the stopper automatically becomes the non-operating position and the arm can be sufficiently swung toward the raking side. However, when the offset is adjusted so that the packet is positioned in front of the drive unit, the stopper automatically moves to the operating position, and when the packet reaches the limit approach position to the drive unit, the arm swings further toward the scraping side. This prevents packets from coming into contact with or entering the driving section.

〔Effect of the invention〕

Due to the action of the stopper, work can be carried out safely by avoiding contact or entry of the packet into the operating section. Moreover, the structure is simple as the stopper is attached so that it can be slid and operated by an operating cam. It can be done easily and cheaply.

〔Example〕

Next, examples will be shown.

As shown in Fig. 4, a swivel base (2) is attached to a crawler type traveling machine base having a dozer (1), and this swivel base (2) is equipped with a driving part (3) and a driving part (4). A backhoe with a dozer is constructed by attaching a backhoe device (5) to the backhoe.

The boom (6) and boom cylinder (C3) constituting the backhoe device (5) are attached to a location located on the lateral side of the operating section (3) of the swivel base (2). As shown in FIG. 3, the boom (6) has a proximal boom portion (6a
), intermediate boom part (6b) and tip side boom part (6b)
It consists of three boom parts divided into c), and the distal end side of the proximal boom part (6a) so that the intermediate boom part (6b) can be swung around the axis (X) by an offset cylinder (C4). and connect it to the tip side boom part (6
c) is connected to the distal end side of the intermediate boom portion (6b) so as to swing around an axis (Y) parallel to the axis (X). The links attached to the proximal boom part (6a) and the distal boom part (6c) are attached to the arm (7).
a) or (7b), these links are attached to the arm (7a
) and (7b), and the intermediate boom part (6b) form a 1,000-row four-link mechanism, and the arm (8) is connected to the tip side boom part (6b).
), the offset cylinder (C
By the swinging operation of the intermediate boom portion (6b) relative to the proximal boom portion (6a) according to 2), the arm (8) can be adjusted to move in the lateral direction of the swivel base relative to the proximal boom portion (6a). It is configured.

In other words, the arm (8
), packet (9)
is located at one lateral end of the traveling machine so that ditch digging is possible, and by performing offset and raking operations of the arm (8) and raising operation of the boom (6), as shown in Fig. 5. As shown in , the backhoe device can be stored in a small turning storage state in which the packet (9) is located on the side opposite to the driving section side and the entire backhoe device (5) enters within the turning radius of the turning base (2). It is structured as follows.

As shown in Figures 1 and 2, a safety device having a stopper (10) for the arm (8) is provided between the arm (8) and the boom (6), and the arm (8) is placed on the driving section side. The offset is adjusted to prevent the packet (9) from entering the driving section (3) when operating the backhoe device.

That is, the stopper (10) is attached to the side surface of the distal boom section (6c) via the fixture (11), and the distal end acting portion (10a) is slidably supported by the fixture (11). There is an active position (A) in which the tip protrudes from the attachment (11) toward the arm side, and a non-active position (B) in which the tip active part (10a) is retreated toward the intermediate boom portion side than in this active position (A). It is constructed so that it can be changed by sliding. When the stopper (10) is in the operating position (A), the arm (8) swings toward the raking side relative to the distal end boom portion (6c), and as the set raking angle (θ1) is reached, the stopper When the tip acting part (10a) of the arm (10) and the stopper contact part (8a) of the arm (8) are in contact with each other, and the stopper (10) is in the non-acting position (B), the arm (8) ) is configured so that the stopper (10) and the arm (8) do not come into contact with each other even when the arm (8) swings to the set raking angle (θ2) with respect to the distal end side boom portion (6c).

A member forming an operating cam portion (12) that acts on the stopper (10) is provided on the side surface of the intermediate boom portion (6b), and the intermediate boom portion (6b) is provided on the proximal portion (6).
A first cam surface (12a) and a second cam, which are provided so that the operating cam part (12) can slidably come into contact with the end part (10b) of the stopper (10) as the operation cam part (12) swings relative to a). Since the stopper (10) is configured to be slidably operated due to the surface (12b) and the rocking force of the intermediate boom portion (6b), the intermediate boom portion (6b) is moved from the proximal boom portion (6b). 6a), the stopper (10) moves the first cam surface (12a) to operate the stopper (10) to the operating position (A). At the same time, the arm (
8) is the set plowing angle (C) with respect to the boom (6).
1) It is configured so that it cannot be raked and swung further than 1), and the intermediate boom part (6b) is set at the set offset angle (
C2) is oscillated, the stopper (10) is in the second position.
The cam surface (12b) is moved and the stopper (10) is operated to the non-operating position (B), and the arm (8) swings toward the raking side with respect to the boom (6) beyond the set raking angle (C1). It is configured so that it can be done.

The offset angle when adjusting the offset of the arm (8) so that the packet (9) is located in front of the driving part (2) is set as the set offset angle (C2), ) is set as the set scraping angle (C1) when the arm (8) is operated to scrape so as to approach the permissible limit. When the offset is adjusted so that the stopper (10) is in the operating position (A), the stopper (10) automatically moves to the operating position (A), and the packet (9)
When the arm approaches the limit position, the stopper (10) prevents the arm from moving beyond this position. When the offset adjustment is made so that the packet (9) is located on the opposite side from the driving part (3), the stopper (10)
automatically becomes the non-operating position, and it becomes possible to pull the arm in so that the packet (9) enters onto the swivel table.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the safety device for a backhoe according to the present invention, FIG. 1 is a plan view of a stopper installation section, FIG. 2 is a side view of the stopper installation section, and FIG. 3 is a plan view of the backhoe device. Figure 4 is a side view of the entire backhoe with dozer, Figure 5
The figure is a side view of the backhoe device in a stored state. (2)...Swivel base, (5)...Backhoe device, (6)...Boom, (6a)...
...Proximal boom part, (6b)...Middle boom part, (6c)...Distal boom part, (
8) Arm, (10) Stopper (12) Operation cam part, (12a),
(12b)...Cam surface, (A)...Working position, (B)...Non-working position, (C2)...
...Offset cylinder, (θ,) ...Setting plowing angle, (C2) ...Setting offset angle. Figure 1 Figure 2

Claims (1)

[Claims] The boom (6) of the backhoe device (5) has a proximal boom portion (6a) attached to the lateral side of the operating section of the swivel base (2), and a proximal boom portion (6a) ) and an intermediate boom portion (6b) that is swingably connected to the intermediate boom portion (6b).
and a distal end boom portion (6c) which is swingably connected to the arm (8), and the intermediate boom portion (6b) is connected to the proximal boom portion (6b).
6a) to adjust the movement of the arm (8) in the lateral direction of the swivel base relative to the proximal boom portion (6a). Then, the stopper (10) for the arm (8) is set at a set pulling angle (
an operating position (A) that protrudes toward the arm side in a state where it comes into contact with the arm (8) that is swung toward the raking side at θ_1);
The arm (8
), and an operating cam part that is slidably attached to the distal boom part (6c) to a non-operating position (B) at the rear end on the intermediate boom part side without contacting the intermediate boom part, and acts on the stopper (10). (12)
is provided in the intermediate boom portion (6b), and the stopper (10) is slidably operated as the intermediate boom portion (6b) swings with respect to the proximal boom portion (6a). (6b) is set at an offset angle (θ_
2) in the swinging state, the stopper (10) is operated and supported to the operating position (A), and the intermediate boom portion (6b) is moved against the proximal boom portion (6a) by the operating portion ( 3) and the set offset angle (θ
The cam surfaces (12a) and (1) that operate the stopper (10) to the non-operating position (B) when the
2b) is provided on the operating cam portion (12).