Working machine attachment attaching and detaching device

Details Working machine attachment attaching and detaching device Working machine attachment attaching and detaching device

1999-11-04

2001-10-30

Batson, Victor (Department: 3671)

Excavating

Combined or convertible

Having quick-connect coupling

C403S322100, C414S723000

Reexamination Certificate

active

06308442

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a working machine attachment attaching and detaching device.
BACKGROUND ART
Construction machines such as a hydraulic excavator, a wheel loader, and the like are widely used for work such as gravel or earth digging, road work, farm land consolidation, land creation, water and sewage work, construction foundation work, and the like. In order to carry out the above work with a small number of construction machines, the hydraulic excavator, for example, is interchangeably (that is, attachably and detachably) provided with various kinds of working machine attachments such as various kinds of buckets, a hydraulic breaker, a crusher, and the like. Moreover, a working machine attachment attaching and detaching device called a so-called quick coupler is used to enhance attachment and detachment efficiency.
Although there are various kinds of working machine attachment attaching and detaching devices, the technology described in Japanese Utility Model Bulletin No. 3030543 is the nearest to the present invention. Specifically, as an outline thereof is shown in
FIG. 8
, “A working machine attachment attaching and detaching device includes a first member
1
and a second member
2
. The first member
1
, the basic end of which is connected to the forward end of a working machine arm
3
with a first cross-pin P
1
, is rotatable around the first cross-pin P
1
by extension and contraction of a hydraulic cylinder
4
. Meanwhile, the second member
2
, the basic end of which is connected to the forward end of the first member
1
with a second cross-pin P
2
, hangs downward. Moreover, with respect to a third cross-pin P
3
and a fourth cross-pin P
4
each provided in a working machine attachment
5
such as a bucket, breaker, or the like, the first member
1
has a hook
6
with a rotary cap
6
a
for engaging with the third cross-pin P
3
and covering it with the cap near the basic end thereof, and the second member
2
has a hook
7
with a rotary cap
7
a
for engaging with the fourth cross-pin P
4
and covering it with the cap at the forward end thereof.” is described.
The above prior art, however, has the following disadvantages.
(1) The hooks
6
and
7
are complicated since they have many parts and mechanisms composing the rotary caps
6
a
and
7
a
in narrow spaces. As a result, costs are increased, and durability including rain proof, rust proof, vibration proof, and the like is insufficient for construction equipment which operates in harsh environments. Hence, there is the possibility that the rotary caps
6
a
and
7
a
, for example, will not rotate due to rusting, earth and sand caught in the caps, or the like.
(2) The hook
7
opens transversely. Therefore, it is required to previously rotate the second member
2
leftward as illustrated by some means such as manual work or the like and hold it prior to the engagement of the fourth cross-pin P
4
. Further, in the engagement of the fourth cross-pin P
4
, it is necessary to rotate the second member
2
by some means such as manual work or the like to engage the fourth cross-pin P
4
. After all, automatic engagement can not be attained by a share performed by the above manual work.
(3) In the attachment and detachment operation of the working machine attachment
5
, generally the operation during engagement (namely, during “attachment”) requires more careful handling and more time than the operation during disengagement (namely, during “detachment”). In engagement, as shown in
FIG. 9A
, with respect to a pin which is engaged first (the third cross-pin P
3
in this example) out of the third and fourth pins P
3
and P
4
, the degree of freedom for its alignment is high. Accordingly, even in the conventional method in which the third cross-pin P
3
is driven into a pin boss, for example, attachment and detachment efficiency never drops greatly. Meanwhile, as shown in
FIG. 9B
, with respect to a pin which is engaged later (the fourth cross-pin P
4
in this example), the degree of freedom for its alignment is reduced because the third cross-pin P
3
is engaged first, thereby making its alignment difficult. Namely, if at least the fourth cross-pin which is engaged later is not easy to align, attachment and detachment efficiency drops greatly. However, the hooks
6
and
7
in the above prior art have the rotary caps
6
a
and
7
a
respectively. In the case of the small-sized working machine attachment
5
, when the engagement of the third cross-pin P
3
engaged first is performed only by manual work, higher attachment and detachment efficiency can be often obtained. In other words, the hooks in the prior art are superfluous and costly for the small-sized working machine attachment
5
.
SUMMARY OF THE INVENTION
In view of the aforesaid conventional disadvantages, an object of the present invention is to provide a working machine attachment attaching and detaching device capable of attaining any one or some of simple structure, low cost, high durability, automatic engagement, facilitation of alignment in insertion of a pin regardless of the size of a working machine attachment.
To attain the above object, if explained mainly with reference to
FIG. 1A
, for example, [It should be noted that a numeral and symbol of each component is given in ( )], a first configuration of a working machine attachment attaching and detaching device according to the present invention is a working machine attachment attaching and detaching device including
a first member (
1
) and a second member (
2
),
the first member (
1
) the basic end of which is connected to the forward end of a working machine arm (
3
) with a first cross-pin (P
1
) being rotatable around the first cross-pin (P
1
) by extension and contraction of a hydraulic cylinder (
4
),
the second member (
2
) the basic end of which is connected to the forward end of the first member (
1
) with a second cross-pin (P
2
) hanging downward, and
with respect to a third cross-pin (P
3
) and a fourth cross-pin (P
4
) each provided in a working machine attachment (
5
) such as a bucket, breaker, or the like, the first member (
1
) being free to engage with the third cross-pin (P
3
) in the vicinity of the basic end thereof, and the second member (
2
) being free to engage with the fourth cross-pin (P
4
) at the forward end thereof, characterized by including
a stop pin (P
7
), and characterized in that
the second member (
2
) is provided with a pair of side plates (
2
R,
2
L) disposed opposite to each other in a transverse direction and has an integral configuration,
each of the side plates (
2
R,
2
L) has a first horizontal thorough-hole (
2
RH,
2
LH) for inserting the stop pin (P
7
), a recessed portion (
8
) provided with a front and rear slant faces (
2
FF,
2
BB) the opening space of which widens more toward the forward ends, and a hook (
9
A) almost the center of which is connected with a fifth cross-pin (P
5
) between both the side plates (
2
R,
2
L),
the hook (
9
A) bends at a pin connecting portion with the fifth cross-pin (P
5
), being divided into an upper portion and a lower portion and formed almost into an L-shape, the upper potion being a spindle portion (
9
u
) having a second horizontal through-hole (
9
H) for inserting the stop pin (P
7
), the lower portion being a hook body (
9
d
) which opens to both the recessed portions (
8
,
8
) side, and the almost L-shape being formed in such a manner that the lower face of the spindle portion (
9
u
) partly protrudes from the bottoms of both the recessed portions (
8
,
8
) and that the hook body (
9
d
) opens to both the recessed portions (
8
,
8
) side while fully opening the apertures of both the recessed portions (
8
,
8
) when the hook (
9
A) is balanced rotationally around the fifth cross-pin (PS) by its own weight, and in that
the first and second members (
1
,
2
) and the first and second horizontal through-holes (
2
RH,
2
LH,
9
H) are set to have a relationship in which the fourth cross-pin (P
4
) is located nearly beneath both the recessed portions (
8
,
8
) wh

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