JPS63569B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a quick coupler, and more particularly to a so-called Z-bar link having a pair of lift arms spaced apart in the lateral direction and a tilt link positioned between the pair of lift arms in the lateral direction. This invention relates to a quick coupler for detachably connecting a working device to a gauge type (including reverse Z-bar linkage type and forward Z-bar linkage type) earthmoving vehicle.

As a quick coupler for removably connecting a bucket, blade, fork, or other working device to an earthmoving vehicle such as a loader, for example, JP-A-54-
Publication No. 56202, Japanese Patent Application Laid-Open No. 54-56203 or Japanese Patent Application Publication No. 56202
As disclosed in Publication No. 55-65639, etc., a quick coupler consisting of a hitch attached to the front end of an earthmoving vehicle and a hook fixed to the back of a working device to be connected to a construction vehicle has already been proposed and put into practical use. has been done.

However, conventional quick couplers have a so-called tilt coupler having a pair of lift arms spaced apart laterally and a pair of tilt links corresponding to the pair of lift arms spaced apart laterally at substantially the same distance. It was developed for 8-bar linkage type earthmoving vehicles, and can be applied as is to Z-bar linkage type earthmoving vehicles in which one (or two) tilt links are located laterally between a pair of lift arms. I can't. To further address this point, the hitch in a conventional quick coupler includes a pair of side members disposed at a distance in the lateral direction corresponding to the lateral distance between the pair of lift arms; The hitch body includes an upper horizontal member disposed between the upper end portions and a lower horizontal member disposed between the lower end portions of the pair of side members, and has a generally rectangular shape as a whole. There is. Lower engaging portions are provided at both end portions of the upper horizontal member, and upper engaging portions are provided at both end portions of the lower horizontal member. When such a hit is installed on an 8-bar linkage type earthmoving vehicle, the lower ends of the pair of side members are rotatably connected to the tips of the pair of lift arms, and the upper ends of the pair of side members are connected to the ends of the pair of lift arms. portion is pivotally connected to the tip portions of the pair of tilt links. On the other hand, when the hitch as described above is to be attached to a Z-bar linkage type earthmoving vehicle, it is necessary to attach the hitch not to the lower ends of the pair of side members but to the upper side member (or an additional member fixed thereto). ) is rotatably connected to the tip of one (or two) tilt links. As is well known to those skilled in the art, in a Z-bar linkage type earthmoving vehicle, when the tilt link is placed in the most tilted position, the tip of the tilt link is lower than the upper edge of the pair of lift arms in the vertical direction. It is set to descend downward. Therefore, when the above-mentioned conventional quick coupler is applied as is to a Z-bar linkage type earthmoving vehicle, as is easily understood, when the tilt link is tilted back to a predetermined position before the most tilted back position, the tilt back is adjusted accordingly. Both ends of the upper horizontal member of the hitch then come into contact with the upper edges of the pair of lift arms, making further tiltback impossible. Such a problem can be solved by making the interconnection position of the hitch and the hook offset forward by a required distance with respect to the tip position of the pair of lift arms, and also by setting a position corresponding to the offset distance in the lateral center of the upper horizontal member. This problem can be solved by fixing an additional member extending rearward by the length and pivotally connecting the tip of the tilt link to the rear end of this additional member. However, in this case, the position of the working device with respect to the tip positions of the pair of lift arms is offset forward by the above-mentioned offset distance. the maximum allowable load on the implement that allows the implement to be tilted back from the
and the chipping load (the maximum load that can be loaded onto the working equipment without the rear end of the earthmoving vehicle floating off the ground with the pair of lift arms extending substantially horizontally) has been significantly reduced. Put it away.

In addition, in the conventional quick coupler, when the pair of lower engaging parts of the hitch are engaged with the corresponding pair of lower receiving parts of the hook fixed to the back surface of the working device, the pair of lower engaging parts of the hitch In contrast, rearward and upward movement of the pair of lower receiving portions of the hook is restricted, but downward movement is not restricted. Therefore, the vertical load of the working equipment and the earth and sand loaded thereon is transmitted to the pair of lift arms from the pair of lower engaging parts of the hitch that engage with the corresponding pair of lower receiving parts of the hook. Rather, it engages with the corresponding pair of upper receiving parts of the hook and restrains the downward movement of the pair of upper receiving parts of the hook from the pair of upper engaging parts of the hitch through the pair of side plates of the hitch main body. It is transmitted to a pair of lift arms. Therefore, the strength of the pair of side plates of the hitch body must be sufficient to withstand the vertical load of the working equipment and the earth and sand loaded thereon. In addition, when a conventional quick coupler is applied to a Z-bar linkage type earthmoving vehicle, the lateral distance between the pair of upper engaging parts of the hitch and the part to which the tip of the tilt link is connected becomes considerably large. Therefore, when the hitch and the hook are connected considerably and the working equipment is connected to the earthmoving vehicle, it is compared to the upper horizontal member that extends laterally between the pair of upper engaging parts and the part where the tip of the tilt link is connected. A large moment acts on the target. Therefore, the strength of the transverse member must be sufficient to withstand the relatively large moments mentioned above. Because of this, in the conventional quick coupler,
The weight of the hitch itself becomes considerably large, and the manufacturing cost of the hitch becomes considerably high.

The present invention has been made in view of the above facts, and is a quick coupler for a Z barringage type earthmoving vehicle, which is a new and excellent quick coupler that solves the above-mentioned problems related to the conventional quick coupler. The goal is to provide the following.

According to the present invention, a hit that is attached to a Z-bar linkage type earthmoving vehicle has a pair of lift arms spaced apart in the lateral direction and a tilt link positioned between the pair of lift arms in the lateral direction; a hook fixed to the rear side of a working device to be connected to the earthmoving vehicle; the hitch having a laterally extending transverse member and a longitudinal member extending upwardly from a transversely intermediate portion of the transverse member; a substantially inverted T-shaped main body; a pair of lower engaging portions disposed at both ends of the horizontal member; at least one upper joint portion disposed at the upper end of the vertical member; at least one intermediate engaging portion disposed at a directional intermediate portion; a pair of locking members mounted on the main body so as to be movable between a locked position and an unlocked position and spaced apart in the lateral direction; A locking member operating mechanism is provided on the main body, and both ends of the horizontal member are pivotally connected to the tips of the pair of lift arms, and the vertical member is pivotably connected to the tips of the tilt link. The hook is attached to the earthmoving vehicle by being connected, and the hook cooperates with and engages with the pair of lower engaging parts of the hitch, and the hook connects the hitch with the pair of lower engaging parts. a pair of lower receiving parts that are restrained from moving backwardly and vertically with respect to the lower engaging part of the hitch; an upper receiving part that is restrained from moving forward and backward and downward relative to the upper engaging part;
an intermediate receiving part that cooperates with the intermediate engaging part of the hit and is restrained from moving upwardly with respect to the intermediate engaging part by engaging with the intermediate engaging part; A pair of locked parts that cooperate with the locking members and restrain the pair of lower receiving parts from moving forward with respect to the pair of lower engaging parts by engaging the pair of locking members. A quick coupler is provided having the following features:

Reference will now be made in further detail to the accompanying drawings, which illustrate preferred embodiments of quick couplers constructed in accordance with the present invention.

Referring to FIG. 1, the illustrated quick coupler constructed in accordance with the present invention consists of a hit, generally designated 2, and a hook, generally designated 4.

The hitch 2 has a generally inverted T-shaped main body having a horizontal member 6 extending in the horizontal direction and a vertical member 8 extending in the vertical direction. The transverse member 6 in the illustrated example is formed from a member having a U-shaped cross-section with an open front surface and extending substantially horizontally in the transverse direction. Further, the vertical member 8 is formed of four plates 8a, 8b, 8c, and 8d fixed to the outer surface of the lateral intermediate portion of the horizontal member 6 at intervals in the horizontal direction. four plates 8a, 8b,
8c and 8d extend upwardly from their lower ends fixed to the transverse member 6 substantially parallel to each other.

Referring to FIG. 2 together with FIG. 1, a pair of supports 10 and 12 are fixed in both ends of the transverse member 6, respectively, at a distance in the lateral direction. Each of the supports 10 has an inner end of a pin 14 removably mounted in any suitable manner, and an outer end of the pin 14 that projects laterally outwardly beyond the side end of the transverse member 6. , a roller 16 constituting a lower engaging portion of the hitch 2 is fixed. Further, in the center of the horizontal member 6, a double rod type fluid pressure cylinder mechanism 18, which constitutes a lock member operating mechanism, is disposed. Each of the two output rods 20 (only one of which is shown in FIG. 2) of this fluid pressure cylinder mechanism 18 has a pin 22 (one of which is shown in FIG. 2) constituting a locking member. ) is fixed at its inner edge. When the output rod 20 of the hydraulic cylinder mechanism 18 is in the retracted state, the pin 22 is in the unlocked position shown in FIG. The end is located in a lateral through hole 24 formed in the support 12. However, as will be discussed later, when the output rod 20 of the hydraulic cylinder mechanism 18 is extended, the pin 22 is moved laterally outwardly so that its tip is attached to the support 12.
The locking position is such that it projects beyond the through hole 24 formed in the support body 12 and the support body 10 into the gap between the support body 12 and the support body 10. An annular flange 26 is formed on the pin 22, and in the unlocked position, the inner surface of the annular flange 26 abuts against a stop piece 28 fixed to the transverse member 6, as shown in FIG. On the other hand, in the above lock position,
The outer surface of the annular flange 26 abuts the inner surface of the support 12, thus ensuring that the pin 22 is in either the unlocked position or the locked position.

To further explain the hitch 2 with reference to FIG. 1, the four plates 8 forming the vertical member 8
A pipe member 30 extending laterally is fixed to the upper ends of a, 8b, 8c and 8d. As will be clear from the following description, the both side portions 32 of the tube member 30, more specifically, the portion 32 between the plates 8a and 8b and the portion 32 between the plates 8c and 8d constitute the upper engaging portion of the hitch 2. . Further, the lateral intermediate portion of the tube member 30, that is, the plates 8b and 8c
A guide protrusion 33 (see FIG. 3-A) is formed on the front surface of the intermediate portion.

Furthermore, in the illustrated embodiment, the plate 8a
Pipe members 34 constituting intermediate engagement portions of the hitch 2 are fixed between the vertical intermediate portions of the plates 8c and 8b and between the vertical intermediate portions of the plates 8c and 8d, respectively.

The hitch 2 as described above is used for earthworks at both ends of the horizontal member 6, more specifically, at the portion between the support 10 and the roller 16 of each of the pins 14 located at both ends of the horizontal member 6. A pair of lift arms 36 of the vehicle
(shown by the two-dot chain line in Figures 1 and 2), and also attaches the vertical member 8, more specifically, the vertically intermediate portions of the plates 8b and 8c, to the top of the earthmoving vehicle. Book tilt link 38 (1st
(shown by a two-dot chain line in the figure), the lift arm 36 is positioned between a pair of lift arms 36 that are spaced apart from each other in the lateral direction. A Z-bar linkage type earthmoving vehicle having one tilt link 38 is mounted as required.

Next, the hook 4 which cooperates with the hitch 2 as described above will be explained. Referring to FIG. 1, a working device 40 such as a bucket (2
The hook 4 fixed to the back of the
A pair of lower hook parts 42 fixed to the lower part of the back surface of the working device 40 at a distance in the horizontal direction; It is provided with a pair of upper hook parts 44 fixed at a slight interval.

Each of the pair of lower hook portions 42 has an outer plate 46 and an inner plate 48 that are spaced apart from each other in the lateral direction. outer plate 46
A substantially semi-cylindrical lower receiving surface 50 that is open toward the rear is formed in each of the lower receiving surfaces 50 . Such a lower receiving surface 50 is formed on each of the outer plates 46.
constitute a lower receiving portion of the hook 4 which cooperates with a pair of lower engaging portions of the hitch 2, ie, rollers 16, as will become clear from the following description. On the other hand, each of the inner plates 48 is formed with a protrusion 54 having a lateral through hole 52 . As will become clear from the following description, the projections 54 formed on each of the inner plates 48 constitute a locked portion that cooperates with each of the pair of locking members or pins 22 of the hitch 2. Each of the pins 22 is inserted into each through hole 52 of the protrusion 54 .

At the upper end of each of the pair of upper hook parts 44,
A substantially semi-cylindrical upper receiving surface 56 that opens downward is formed, and an arc-shaped intermediate receiving surface that opens rearward and upward is formed at the lower end of each of the pair of upper hook portions 44. A surface 58 is formed. As will become clear from the following description, the upper receiving surface 56 formed on each of the pair of upper hook portions 44
A pair of upper engaging portions of the hitch 2, that is, a pipe member 30
An intermediate receiving surface 58 formed on each of the pair of upper hook portions 44 constitutes an upper receiving portion that cooperates with each of the side portions 32 of the hitch 2, that is, an intermediate receiving surface 58 formed on each of the pair of upper hook portions 44. An intermediate receiver is configured to cooperate with each other.

Next, with reference to FIGS. 3-A, 3-B, and 3-C together with FIGS. 1 and 2, the operation and effect of the quick coupler consisting of the hitch 2 and the hook 4 as described above will be explained. explain.

In order to interconnect the hitch 2 and the hook 4 and thus connect the working device 40 to the earthmoving vehicle,
The earthmoving vehicle is advanced against the back of the working device 40 placed on a support base such as the ground, and the third
- As shown in Figure A, the hitch 2 attached to the front end of the earthmoving vehicle is positioned opposite to the hook 4 fixed to the back of the working device 40. Then, the earthmoving vehicle is further advanced, and as shown in FIG. 3-B, both sides 32 of the pipe member 30 of the hitch 2 are
(i.e., the pair of upper engaging parts) are connected to the middle part of the pair of upper parts 44 of the hook 4, that is, the upper receiving surface 56 and the lower receiving surface 5.
8 and the middle part thereof. At this time, the guide protrusion formed on the front surface of the intermediate portion of the tube member 30 is inserted between the pair of upper hook portions 44, and thus the lateral position of the hitch 2 with respect to the hook 4 is appropriately guided and set. . Next, lift arm 3
6 to the upper receiving surface 5 of each of the pair of upper hook parts 44 of the hook 4.
6 (that is, the upper receiving surface), respectively. Thus, as can be easily understood by referring to FIG. 1 and FIG. 3-B, the tube member 3 of the hitch 2
Relative movement of the upper receiving surfaces 56 of the pair of upper hook parts 44 of the hook 4 in the front-rear direction and downward with respect to the side parts 32 of the hook 4 is restricted. Thereafter, when the lift arm 36 is further raised and the tilt link 38 is tilted back, the hitch 2 and the hook 4 are rotated relative to each other around the central axis of the tubular member 30 of the hitch 2 in a direction in which they approach each other. . Thus, as shown in FIG. 3-C, each of the pair of tube members 34 (i.e., intermediate engaging portions) of the hitch 2 engages with the intermediate receiving surfaces 58 (i.e., intermediate receiving portions) of the pair of upper hook portions 44 of the hook 4. At the same time, each of the pair of rollers 16 (i.e., the lower engaging portions) of the hitch 2 engages with the pair of lower hook portions 4 of the hook 4.
It is engaged with the lower receiving surface 50 (ie, the lower receiving part) of No. 2. In addition, a pair of lower hook portions 4 of the hook 4
Each of the two protruding parts 54 (i.e., the locked part) is inserted into the gap between the respective supports 10 and 12 at both ends of the horizontal member 6 in the hit 42, and is formed on each of the supports 12. The through holes 24 formed in the projections 54 and the through holes 52 formed in each of the protrusions 54 are aligned with each other.

As can be easily understood by referring to FIG. 1 and FIG. 3-C, when the pair of pipe members 34 of the hitch 2 are engaged with the pair of intermediate receiving surfaces 58 of the hook 4, the hitch 2 The rear and upward movements of the pair of intermediate receiving surfaces 58 of the hook 4 are restrained with respect to the pair of pipe members 34, and the pair of rollers 16 of the hitch 2 engage with the pair of lower receiving surfaces 50 of the hook 4. When brought together, the pair of lower receiving surfaces 50 of the hook 4 are restrained from moving rearward and in the vertical direction with respect to the pair of rollers 16 of the hitch 2. Next, hitchi 2
The hydraulic cylinder mechanism 18 (ie, the locking member actuating mechanism) disposed within the transverse member 6 is actuated to extend the two output rods 20.
In this way, a pair of pins 22 (i.e. locking members)
is moved laterally outward from the unlocked position shown in FIG. It penetrates each through hole 52, thus locking each of the pair of protrusions 54 in place. Once each of the pair of protrusions 54 is locked in place by each of the pair of pins 22, the hit 2 A pair of lower receiving surfaces 5 of the hook 4 with respect to a pair of rollers 16
The forward movement of 0 is also restrained, thus hitting 2
and the hook 4 are reliably connected, and therefore the working device 40 is reliably connected to the earthmoving vehicle.

In order to disconnect the hitch 2 and the hook 4 and detach the working device 40 from the earthmoving vehicle, the above-described connecting operation may be performed in reverse.

4 and 5 illustrate a second embodiment of a quick coupler constructed in accordance with the present invention.

In the second embodiment illustrated in FIGS. 4 and 5, the cross member 106 of the hitch 102 is formed from a tubular member having a somewhat shorter lateral length than the cross member 6 in the first embodiment. has been done. A laterally inner side portion of a substantially cylindrical support body 110 that projects laterally outward from the horizontal member 106 is fixed to each of both side end portions of the horizontal member 106 . The inner end of a pin 114 is removably attached to each of the supports 110 by an appropriate method, and a roller 116 constituting the lower engagement portion of the hitch 102 is fixed to the outer end of the pin 114.

The front half 11 of the lateral outer part of the support 110
0a is made to have a somewhat smaller diameter than the rear half 110b, and as can be seen from FIG. It is formed into a special shape that is a combination of a semi-cylindrical rear half 110b having the same outer diameter and a semi-cylindrical front half 110a having a somewhat smaller outer diameter than the main portion. The laterally central portion and the specially shaped laterally outer portion of the support body 110 have an outer diameter that is substantially equal to the outer diameter of the laterally center portion (therefore, the outer diameter of the rear half portion 110b of the laterally outer portion is also substantially equal to the outer diameter of the laterally outer portion 110b). Cylindrical sleeve 1 with inner diameter (equal to above)
13 is fitted so as to be slidable laterally. In the specific example shown in FIGS. 4 and 5, this sleeve 113 constitutes the locking member of the hitch 102. A slit 115 that extends through the support body 110 in the front-rear direction (that is, in the direction perpendicular to the plane of paper in FIG. An elongated sliding body 1 extending to
17 are arranged so as to be slidable laterally. A pin 1 extending in the front-rear direction is attached to this sliding body 117.
19 connects the sleeve 113. A laterally outer end of a laterally extending pin 122 is also connected to the slide 117 by a pin 119 . The laterally inner ends of the laterally extending pins 122 are connected to each of the two output rods 120 of a double rod hydraulic cylinder mechanism 118 centrally disposed within the transverse member 106. The hydraulic cylinder mechanism 118 constitutes a locking member actuating mechanism as in the case of the first embodiment, and when the pair of output rods 120 of the hydraulic cylinder mechanism 118 are in the retracted state, the output rods 120 of the hydraulic cylinder mechanism 118 operate as indicated by solid lines in FIG. with the fifth
As shown by the two-dot chain lines in the figure, the pair of sleeves 113 constituting the locking member are positioned in a non-locking position where their inner ends abut against the outer surfaces of the plates 108a and 108d, respectively, constituting the vertical member 108. There is. On the other hand, when the pair of output rods 120 of the fluid pressure cylinder mechanism 118 are extended, the pair of sleeves 113 constituting the locking member move against the slider 11 as shown by solid lines in FIG.
7 is moved laterally outward until it abuts the laterally outer end of the slit 115 and is positioned in the lock position.

On the other hand, the pair of sleeves 11 of the hitch 102
3 (i.e., the locking member) are semi-cylindrical portions provided in the inner plate 148 of each of the pair of lower hook portions 142, as shown more clearly in FIG. It consists of 154. The inner diameter of the semi-cylindrical portion 154 with the rear half cut out is substantially the same as the outer diameter of the front half portion 110a of the laterally outer portion of the support 110 in the hitch 102, and the semi-cylindrical portion 154 has a notched rear half.
The outer diameter of the support body 11 in the hitch 102 is
It is substantially the same as the outer diameter of the rear half portion 110b of the laterally outer portion of 0.

Next, the cooperation between the pair of sleeves 113 (i.e., locking members) of the hitch 102 and the pair of semicylindrical portions 154 (i.e., the locked portions) of the hook 104 will be explained.
When the pair of rollers 116 (i.e., lower engaging portions) of the hitch 102 are brought into engagement with the pair of lower receiving surfaces 150 (i.e., the lower receiving portion) of the hitch 104 by performing the connection operation between the hook 104 and the hook 104, the hook 104
Each of the pair of semi-cylindrical portions 154 in the hitch 102 is fitted into the front half 110a of the laterally outer side of each of the pair of supports 110 in the hit 102, and thus the pair of semi-cylindrical portions 154 in the hitch 102 are fitted into the front half 110a of the laterally outer side of each of the pair of supports 110 in the hit 102. Each of the pair of semi-cylindrical portions 154 in the hook 104 is combined to define a cylindrical shape. After that, the fluid pressure cylinder mechanism 1
The two output rods 120 of 18 are extended and the pair of sleeves 113 in hitch 102 are extended.
(i.e., the locking member) is moved laterally outwardly from the unlocked position shown in solid lines in FIG. 4 and in dash-dotted lines in FIG. 5 to the locked position shown in solid lines in FIG. Thus, a pair of sleeves 1
13, the lateral outer portions of each of the supports 11
0 and a pair of semi-cylindrical portions 1
54, and thus each of the pair of semi-cylindrical portions 154 (i.e., the locked portion) of the hook 104 is fitted into the pair of sleeves 113 (i.e., the locking member) of the hit 102. are reliably locked by each of them.

In the second specific example illustrated in FIGS. 4 and 5,
The configuration and effects other than the above-mentioned points are substantially the same as those of the first specific example, so a description thereof will be omitted.

In the quick coupler constructed according to the present invention as described above, the hitch 2 is composed of the horizontal member 6 or 106 and the vertical member 8 or 108.
or 102 has a generally inverted T-shape as a whole, and the lateral member 6 or 106 itself extends in the lateral direction over a length corresponding to the lateral spacing between the pair of lift arms 36 or 136; plate 8
a, 8b, 8c and 8d or 108a, 108
The lateral width of the vertical member 8 or 108 formed from the vertical members b, 108c and 108d is sufficiently smaller than the lateral spacing between the pair of lift arms 36 or 136. Furthermore, the distance between the outer surfaces of each of the pair of upper hook parts 44 or 144 of the hook 4 or 104 (in other words, the lateral width of the entire pair of upper hook parts 44 or 144) is also the same as that of the pair of upper hook parts 44 or 144. It is substantially smaller than the lateral spacing of lift arms 36 or 136. Therefore, as can be easily understood by referring to FIGS. 1 and 4, when the tilt link 38 or 138 is tilted back to the maximum, the tip thereof is vertically moved above the pair of lift arms 36 or 136. When placed below the edge, the vertical member 8 or 108 of the hitch 2 or 102, the pipe member 30 or 130 fixed thereto, the pair of upper hook portions 44 or 144 of the hook 4 or 104, etc. are connected to a pair of lifts. Arm 36 or 13
6, the pair of lift arms 3
It can be tilted back to any desired position between 6 or 136. Therefore, as in the conventional quick coupler mentioned above, the interconnection position of the hitch and the hook is offset forward by the required distance with respect to the tip positions of the pair of lift arms, and therefore the working device for the tip ends of the pair of lift arms is offset forward by a required distance. The position of the working device 40 or 140 relative to the tip of the pair of lift arms 36 or 136 can be adjusted to the tip of the pair of lift arms 36 or 136 without using a quick coupler. It can be made substantially the same as when directly attached, and the above-mentioned decrease in breakout force and chipping load can be avoided.

It should also be noted that in the quick coupler constructed in accordance with the present invention, the hitch 2 or 102 and the hook 4 or 104 are interconnected to connect the pair of rollers 16 of the hitch 2 or 102.
or 116 (i.e. lower engaging part) with hook 4 or 1
When the pair of lower receiving surfaces 50 or 150 of the hook 4 or 104 (i.e., the lower receiving portion) are engaged, the pair of lower receiving surfaces 50 or 150 of the hook 4 or 104 are engaged with the pair of rollers 16 or 116 of the hitch 2 or 102. Not only backward and upward movement, but also downward movement is restricted. Therefore, the vertical load of the working device 40 or 140 and the earth and sand loaded thereon is mainly applied to the pair of lower receiving surfaces 50 of the hook 4 or 104.
or 150 directly to the pair of lift arms 36 or 136 via the pair of rollers 16 or 116 of the hitch 2 or 102, and from the pair of upper receiving surfaces 56 or 156 of the hook 4 or 104 (i.e., the upper receiving surface ) of the hitch 2 or 102 through the side portions 32 or 132 (i.e. the upper engaging portion) of the tube member 30 or 130 and the longitudinal member 8 or 108 to the pair of lift arms 36 or 136; It's only a small part. Therefore,
The required strength of the longitudinal member 8 or 108 is significantly reduced. In addition, the portion of the vertical member 8 or 108 that is engaged with the pair of upper receiving surfaces 56 or 156 (i.e., the upper receiving portion) of the hook 4 or 104 from the portion to which the tip of the tilt link 38 or 138 is connected. Pipe member 30 or 13 of hitch 2 or 102
0 to both sides 32 or 132 (i.e. the upper engaging part), and the pair of intermediate receiving surfaces 5 of the hook 4 or 104.
8 or 158 (i.e., the intermediate receiving part) of the pair of tube members 3 of the hit 2 or 102
4 or 134 (ie, the intermediate receiving part) is relatively short. Therefore, when the tilt link 38 or 138 is tilted back or forwarded to cause the work implement 40 or 140 to be tilted back or tilted forward, the hitch 2 or 10
2 tube member 30 or 130, tube member 34 or 13
4 and the longitudinal member 8 or 108 are relatively small. Therefore, from this point of view, the required strength of the pipe member 30 or 130 of the hitch 2 or 102, the pipe member 34 or 134, and the longitudinal member 8 or 108 is relatively small. reduced. Thus, Hituchi 2 or 102
In addition to considerably reducing the weight of itself, Hitachi 2
Alternatively, the manufacturing cost of 102 can be considerably reduced.

Although preferred specific examples of the quick coupler configured according to the present invention have been described in detail above, the present invention is not limited to such specific examples, and various modifications and changes can be made without departing from the scope of the present invention. It does not need much to say that this is possible.

For example, the shapes of the lower, upper, and intermediate engaging portions of the hitch 2 or 102 and the lower, upper, and intermediate receiving portions of the hook 4 or 104 that cooperate with these may be modified as appropriate.

In the illustrated example, the hitch 2 or 102 includes a pair of upper engaging portions (i.e., both side portions 32 or 132 of the tube member 30 or 130) and a pair of intermediate engaging portions (i.e., the tube member 34 or 134). In addition, the hook 4 or 104 is also provided with a pair of upper hook parts 44 or 144 having an upper receiving part (i.e., upper receiving surface 56 or 156) and an intermediate receiving part (i.e., intermediate receiving surface 58 or 158). , if desired, only one upper receiving part and one intermediate receiving part are provided in the lateral center of the hitch 2 or 102, and the hook 4
Alternatively, the number of the upper hook portions 104 having the upper receiving portion and the intermediate receiving portion may be only one located at the center in the lateral direction.

Furthermore, in the illustrated example, hit 2
or 102, both the locking member (i.e., pin 22 or sleeve 113) and the locking member actuating mechanism (i.e., hydraulic cylinder mechanism 18 or 118) are mounted on the transverse member 6 or 106, if desired. Alternatively, the locking member and/or the locking member actuating mechanism at 102 may be mounted on the vertical member 8 or 108.

Furthermore, hitch 2 or 10 in the illustrated embodiment
2 includes one tilt link 38 or 13 between a pair of lift arms 36 or 136 in the lateral direction.
8, the quick coupler constructed in accordance with the present invention has two or more tilt links between a pair of lift arms in the lateral direction. It can also be applied to a Z-bar linkage type earthmoving vehicle, and in this case, the form of the vertical member 8 or 108 of the hitch 2 or 102 can be modified or modified as necessary, and the above-mentioned method can be applied. I did 2
The tips of one or more tilt links may be pivotally connected to an appropriate portion of the vertical member 8 or 108 of the hitch 2 or 102.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first specific example of a quick coupler constructed according to the present invention. Figure 2 shows
FIG. 2 is a sectional view showing a part of the quick coupler shown in FIG. 1; 3-A, 3-B, and 3-C are simplified sectional views for explaining the operation of connecting a hitch and a hook in the quick coupler shown in FIG. 1. FIG. 4 is a perspective view showing a second specific example of the quick coupler constructed according to the present invention. FIG. 5 is a sectional view showing a part of the quick coupler shown in FIG. 4. 2 and 102... hitch, 4 and 104... hook, 6 and 106... horizontal member, 8 and 108...
... Vertical members, 16 and 116 ... (lower engaging portion),
18 and 118...Fluid pressure cylinder mechanism (lock member operating mechanism), 22...Pin (lock member), 1
13...Sleeve (lock member), 32 and 13
2...Both sides of the pipe member (upper engagement part), 34 and 134...Pipe member (middle engagement part), 36 and 13
6... Lift arm, 38 and 138... Tilt link, 40 and 140... Working device, 42 and 142... Lower hook part, 44 and 144... Upper hook part, 50 and 150... Lower receiving surface (lower receiving part), 54... protruding part (locked part), 154...
...Semi-cylindrical part (locked part), 56 and 156
...Upper receiving surface (upper receiving part), 58 and 158...
Intermediate receiving surface (intermediate receiving part).

Claims (1)

[Scope of Claims] 1. A hitch attached to a Z-bar linkage type earthmoving vehicle having a pair of lift arms spaced apart in the lateral direction and a tilt link positioned between the pair of lift arms in the lateral direction. , and a hook fixed to the rear side of the working equipment to be connected to the earthmoving vehicle; a substantially inverted T-shaped main body, a pair of lower engaging parts disposed at both ends of the horizontal member, at least one upper engaging part disposed at the upper end of the vertical member, and the vertical member. at least one intermediate engagement portion disposed at a vertically intermediate portion of the body; a pair of locking members mounted on the body so as to be movable between a locked position and an unlocked position at a laterally spaced interval; and a locking member operating mechanism attached to the main body, which pivotally connects both ends of the horizontal member to the tips of the pair of lift arms, and pivots the vertical member to the tips of the tilt link. The hook is attached to the earthmoving vehicle by being freely connected to the hitch, and the hook cooperates with and engages with the pair of lower engaging parts of the hitch. a pair of lower receiving parts that are restrained from moving backwardly and vertically with respect to the pair of lower engaging parts; a pair of lower receiving parts that cooperate with and engage with the upper engaging part of the hitch; Therefore, the upper receiving part, which is restrained from moving forward and backward and downward relative to the upper engaging part, cooperates with and engages with the intermediate engaging part of the hit. an intermediate receiving part that is restrained from moving upward relative to the intermediate engaging part; A quick coupler comprising a pair of locked parts that restrain the pair of lower receiving parts from moving forward with respect to the mating part. 2. The hook includes a pair of lower hook portions fixed to the lower rear side of the working device at a laterally spaced interval;
and an upper hook portion fixed at the upper rear surface of the working device and between the pair of lower hook portions in the lateral direction, and the pair of lower receiving portions and the pair of locked portions are respectively connected to the pair of lower hook portions. 2. The quick coupler according to claim 1, wherein the upper hook part and the intermediate receiver part are each provided in the upper hook part. 3. The upper engaging portion and the intermediate engaging portion of the hitch are arranged at two intervals in the lateral direction, and correspondingly, the upper hook portions of the hook are also arranged at two intervals at an interval in the lateral direction. The quick coupler according to claim 2, wherein the quick couplers are individually arranged. 4. Each of the pair of locking members of the hitch is laterally movably mounted on the lateral member, and is brought into the locked position by being moved laterally outward from the unlocked position. The quick coupler according to any one of the ranges 1 to 3. 5. Each of the pair of lower hook portions of the hook has an outer plate and an inner plate spaced apart laterally, the outer plate having the lower receiving portion formed therein, and the inner plate having the lower receiving portion formed therein. The quick coupler according to claim 4, wherein a locked portion is formed. 6. The quick coupler according to claim 4 or 5, wherein each of the pair of locking members is a pin, and each of the locked parts has a hole into which the pin is inserted. 7. Each of the pair of locking members is a tubular sleeve, and each of the locked portions is combined with each of the pair of complementary shaped portions formed on the lateral member of the hitch, and the tubular sleeve is fitted therein. The quick coupler according to claim 4 or 5, which defines a cylindrical shape. 8. The lock member operating mechanism of the hit is a double rod type hydraulic cylinder mechanism mounted on the horizontal member, and each of the pair of rods of the hydraulic cylinder mechanism is connected to each of the pair of rod members. A quick coupler according to any one of claims 4 to 7.