JP6360945B2 - Backhoe grip attachment mounting structure - Google Patents

Description

  The present invention relates to a grip attachment mounting structure that allows a single person to easily and safely perform a work of attaching and detaching a grip attachment to and from a backhoe arm.

  2. Description of the Related Art Conventionally, it has been proposed to attach a grip attachment to a position in the vicinity of an arm tip portion to which a backhoe bucket is attached in order to perform a work of grasping and moving waste materials or the like with a backhoe used for excavation work or the like.

  For example, what is proposed in Patent Document 1 is composed of a receiving device that is connected to a mounting device whose grip attachment is fixed to the arm tip of the backhoe and extends downward like a claw, and rotates the bucket. By doing so, the object to be grasped is sandwiched between the bucket and the receiving device so as to be grasped.

  In addition, what is proposed in Patent Document 2 is that a grip attachment (grip fork attachment) is removably pivotally attached to a backhoe arm so as to face a bucket (power shovel) that links with a hydraulic mechanism. The fork frame is constituted by a fork frame that is linked to the movement of the bucket via a link mechanism and holds the object to be grasped between the bucket and the fork frame.

Utility Model Registration No. 3177861 Japanese Patent No. 3551866

  In both of the above-described Patent Document 1 and Patent Document 2, when the grip attachment is not used, it is possible to remove it from the arm of the backhoe. If dropped, the operator may be injured or the attachment may be damaged.

  In particular, the grip attachment used for a small backhoe is relatively light, but when removing and attaching it by one operator, the grip attachment is held by hand and the shaft connected to the arm is inserted and removed. It was necessary and difficult to work, and there was a danger of slipping hands and dropping them under the feet.

  In particular, the one described in Patent Document 2 can open a bucket and a grip attachment on both sides, so that a large object can be gripped. There is a problem that the mechanism is complicated and it takes time to attach and detach the grip attachment.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a backhoe grip attachment mounting structure that can solve the problems in the prior art as described above, and that can easily and safely perform attachment and detachment operations of the backhoe grip attachment.

  The backhoe grip attachment mounting structure of the present invention provided to solve the above-mentioned problems is such that the proximal end side is rotatable and detachable at a position in the vicinity of the tip of the backhoe arm where the bucket is rotatably provided. A mounting structure of a grip attachment that is provided so that a free end side grips an object to be gripped in cooperation with the bucket, and a bearing hole penetrates through a central portion at a position near the tip of the arm. A substantially cylindrical bearing cylinder is fixed so that its axial direction is perpendicular to the longitudinal direction of the arm and both end surfaces protrude from the left and right side surfaces of the arm, and the grip attachment is at least its base end The side has a pair of left and right plate-shaped gripping forks that are integrally connected at opposing intervals that match the length of the bearing cylinder. A shaft hole is formed on the base end side of each of the pair of gripping forks so as to be aligned with the bearing hole of the bearing cylinder, and around the shaft holes on the inner surfaces of the gripping forks facing each other. Each of the bearing cylinders is provided with an arcuate engagement portion in which a part of the outer peripheral surface and the inner peripheral surface of the bearing cylinder face each other, and the gripping attachment has the proximal ends of the pair of gripping forks on both sides of the bearing cylinder. In the state where the coupling shaft is inserted into the shaft hole and the bearing hole of the bearing tube body and is connected to the arm, and the coupling shaft is pulled out from the bearing hole, the respective engaging portions are the bearings. The gripping attachment is prevented from falling by engaging with the outer peripheral surfaces of both ends of the cylindrical body.

  The backhoe includes a telescopic rod tip of a hydraulic cylinder device that rotates the bucket at both ends, and a guide link that is pivotally attached to the arm, and a link between the guide link and the grip attachment. The grip attachment is configured to rotate in conjunction with a direction opposite to the rotation direction of the bucket by the interlocking link connected to the guide link, and the interlocking link is detachable from the guide link. It is desirable to be worn.

  The backhoe grip attachment mounting structure according to another aspect of the present invention has a proximal end side that can be freely rotated and removed at a position in the vicinity of the tip of the arm of the backhoe where the bucket is rotatably provided. A grip attachment mounting structure in which an end side cooperates with the bucket and grips an object to be grasped, and the backhoe has a distal end portion of a telescopic rod of a hydraulic cylinder device that rotates the bucket, respectively. And a guide link pivotally attached to the arm. The attachment structure of the grip attachment includes a substantially cylindrical bearing cylinder fixed to the arm and having a bearing hole penetrating through a central portion, a pair of left and right grip forks constituting the grip attachment, and the pair of grip forks. And an engaging portion that is provided around each shaft hole on the opposite surface of the bearing cylinder and has a part of the outer peripheral surface of the bearing cylinder facing the inner peripheral surface. The grip attachment is rotatably connected to the arm by inserting a connection shaft into each of the shaft hole and the bearing hole, and the guide link and the grip attachment are connected by an interlocking link. The grip attachment is configured to rotate in conjunction with a direction opposite to the rotation direction of the bucket by the interlocking link. The interlocking link is detachably attached to the guide link.

  According to the grip attachment attachment structure of the backhoe according to the first aspect of the invention, an operation of attaching the grip attachment to the arm of the backhoe or an operation of removing the grip attachment can be easily performed, and an accident of accidental dropping when the grip attachment is attached or detached. In particular, it is possible to improve the safety of work when an operator performs attachment / detachment work of a small backhoe gripping attachment alone.

  According to the backhoe grip attachment mounting structure according to the invention of claim 2, in addition to the effect of the invention of claim 1, the interlock link in which the grip attachment is removably attached to the guide link of the backhoe. It is configured to rotate in conjunction with the direction opposite to the rotation direction of the bucket using the, so the structure is simple and the attachment and removal work of the grip attachment to the backhoe can be It can be easily performed only by attaching / detaching the interlocking link to / from the link and attaching / detaching the connecting shaft.

It is a side view of the arm front-end | tip part of a backhoe which attached the grip attachment in one Embodiment of this invention. It is a side view of the arm tip part of a backhoe showing the state where the bucket and the grip attachment were opened in one embodiment of the present invention. It is a side view of the arm front-end | tip part of a backhoe which shows the state which removed the grip attachment in one Embodiment of this invention. It is a fragmentary sectional view of a grip attachment in one embodiment of the present invention. It is a disassembled perspective view which shows the principal part structure of the connection part of an arm and a grip attachment in one Embodiment of this invention. It is sectional drawing which shows the principal part structure of the connection part of an arm and a grip attachment in one Embodiment of this invention. It is a partial side view of the guide link which removed the interlocking link in one Embodiment of this invention. It is a disassembled perspective view which shows the structure of the connection part of a guide link and an interlocking link in one Embodiment of this invention. It is a fragmentary sectional view which shows the structure of the connection part of a guide link and an interlocking link in one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a tip end portion of a backhoe arm to which a grip attachment is attached according to an embodiment of the present invention. The backhoe 1 shown in FIG. 1 is a small-sized off-the-shelf tool used for civil engineering work such as earth excavation. This is a backhoe with a grip attachment.

  A bucket 3 is connected to the tip of the arm 2 of the backhoe 1 so as to be rotatable about an axis 4, and one end of a connecting link 5 is rotated about an axis 6 near the axis 4 of the bucket 3. It is connected freely. The other end of the connecting link 5 is rotatably connected to the distal end of the telescopic rod 8 a of the hydraulic cylinder device 8 via the shaft 7.

  The shaft 7 is rotatably connected to the other end side of a substantially “<”-shaped guide link 10 in a side view, which is connected to the vicinity of the distal end of the arm 2 at one end by a shaft 9. It is connected. Therefore, when the telescopic rod 8a is extended or contracted, the position of the shaft 7 is guided by the guide link 10 and is displaced in an arc around the shaft 9, and the movement is further transmitted to the bucket 3 through the connecting link 5. Thus, the bucket 3 rotates about the shaft 4 counterclockwise or clockwise in FIG. A hanging hook 3a is attached to the back surface of the bucket 3 for suspending and transporting waste materials with wires.

  The grip attachment 11 is rotatably connected to a position in the vicinity of the distal end of the arm 2 by a bolt-shaped connecting shaft 12 whose base end can be removed. The grip attachment 11 has a pair of left and right plate-shaped grip forks 11a that are connected to each other and are integrally formed.

  One end of an interlocking link 13 is pivotally connected by a shaft mounting portion 14 at a position close to the connecting shaft 12 on the outer surface of the left and right gripping forks 11a. Further, the other end of the interlocking link 13 is rotatably connected to a shaft attachment portion 15 provided in the vicinity of a bent portion having a substantially square shape when viewed from the side of the guide link 10.

  When the gripping attachment 11 contracts the telescopic rod 8a of the hydraulic cylinder device 8 from the position shown in FIG. 1, the guide link 10 rotates about the shaft 9 clockwise as shown in FIG. Then, the connecting link 5 is pulled up, and accordingly, the bucket 3 rotates clockwise about the shaft 4.

  Further, as the guide link 10 rotates, the grip attachment 11 connected to the guide link 10 via the interlocking link 13 rotates counterclockwise around the connecting shaft 12. As a result, the bucket 3 and the grip attachment 11 are interlocked so that the respective free end sides are largely opened to both outer sides as shown in FIG.

  On the other hand, when the telescopic rod 8a of the hydraulic cylinder device 8 is extended from the position shown in FIG. 1, the free end sides of the bucket 3 and the grip attachment 11 are rotated so as to be closed as shown by phantom lines in FIG. To do. At this time, the free end side of the pair of gripping forks 11a of the gripping attachment 11 enters between the claw forks 3b provided on the bucket 3, and the gripping object is prevented from falling between them and securely gripped. Can do.

  Further, when the backhoe 1 is used for normal excavation work, as shown in FIG. 3, the grip attachment 11 removes the interlocking link 13 from the shaft attachment portion 15 attached to the guide link 10 side, and By pulling out the connecting shaft 12 that connects the gripping fork 11 a and the bearing cylinder 16 on the arm 2 side, it can be separated from the arm 2 together with the interlocking link 13.

  4 is a partial cross-sectional view of the connecting portion of the grip attachment 11 with the bearing cylinder 16 on the proximal end side, and FIG. 5 is an exploded perspective view of the connecting portion, as shown in these drawings. 16, a bearing hole 16a through which the connecting shaft 12 passes is formed at the center thereof.

  Further, as shown in FIG. 5, the bearing cylinder 16 has a part of the outer peripheral surface formed by a flat surface 16b, and the flat surface 16b is the lower surface of the arm 2 (as viewed from the driver seat side of the backhoe 1). Welded to the front surface 2a and fixed so that the axial direction is perpendicular to the longitudinal direction of the arm 2 and both end surfaces slightly protrude from the left and right side surfaces 2b and 2c of the arm 2. ing.

  As shown in FIG. 4, the pair of left and right gripping forks 11 a constituting the gripping attachment 11 has at least a base end connected to the bearing tube 16 at a facing interval that matches the length of the bearing tube 16. A shaft hole 11b through which the connecting shaft 12 passes is formed at a position that is set and aligned with the bearing hole 16a of the bearing cylinder 16.

  Further, the connecting shaft 12 has a head portion 12a at one end portion thereof, and a screw portion 12b in a range of a predetermined length at the other end portion. The head 12a has a larger diameter than the other part of the connecting shaft 12, and, as shown in FIG. 5, a flat rotation restricting surface 12c is formed on a part of the cylindrical outer peripheral surface. Yes.

  Further, a boss 17 having a receiving surface 17a is fixed around the outer shaft hole 11b of the gripping fork 11a on the right side of the gripping attachment 11, and the connecting shaft 12 is received by the rotation restricting surface 12c. By engaging with the surface 17a, the rotation with respect to the gripping fork 11a is restricted.

  Further, a nut 18 with an arm is screwed to the threaded portion 12b protruding outward from the left gripping fork 11a of the connecting shaft 12, and the left and right gripping forks 11a are secured by the armed nut 18 and the head 12a. The movement of the connecting shaft 12 in the axial direction is restricted.

  The nut 18 with an arm is fixed to the outer surface of the left gripping fork 11a by a fixing bolt 19 passed through a hole 18b provided at the tip of the arm 18a so as not to rotate with respect to the screw portion 12b. Has been. A hole 11c through which the fixing bolt 19 passes is formed in the gripping fork 11a, and a nut 20 into which the fixing bolt 19 is screwed is fixed by welding.

  Further, around the shaft holes 11b on the inner surfaces of the gripping forks 11a on both the left and right sides, a part of the outer peripheral surface of the bearing cylinder 16 and the arc-shaped engaging portion 21 are opposed to each other. Is provided. As shown in FIG. 4, when the connecting shaft 12 is mounted, the weight of the grip attachment 11 is received by the bearing cylinder 16 via the connecting shaft 12.

  In this state, there is a slight gap between the inner peripheral surface of each of the engaging portions 21 and the outer peripheral surface of the bearing cylinder 16, and the grip attachment 11 is connected to the bearing cylinder 16 with the connecting shaft 12. In addition, it can rotate without any trouble.

  On the other hand, as shown in FIG. 6, in the state where the connecting shaft 12 is pulled out from the bearing hole 16 a of the bearing cylinder 16, the inner peripheral surfaces of the respective engaging portions 21 are the opposite ends of the bearing cylinder 16. The weight of the grip attachment 11 is supported by the bearing cylinder 16 through these engaging portions 21.

  Further, as shown in FIG. 4, the shaft attaching portion 14 that grasps the interlocking link 13 and connects to the attachment 11 has shaft holes 11d formed in each of the pair of grasping forks 11a and both the grasping forks 11a. It is comprised by the axial bolt 22 which each penetrates the axial hole 13a of the interlocking link 13 each arrange | positioned on the outer side, and the nut 23 screwed by the said axial bolt 22. FIG.

  These interlocking links 13 are rotatably held between the nut 23 and the bolt head portion 22a of the shaft bolt 22. The nut 23 is fixed to the threaded portion 22b of the shaft bolt 22 by means (not shown) at a position adjusted so that the interlocking links 13 can be smoothly rotated.

  As shown in FIG. 4, the shaft bolt 22 is provided through the inside of a rectangular tube-shaped hollow connecting member 24 that integrally connects the gripping forks 11 a on both sides. Although not shown, the pair of gripping forks 11a are connected by a plurality of connecting members in addition to the connecting member 24.

  FIG. 7 is a partial side view of the guide link 10 with the interlocking link 13 removed, and FIG. 8 is an exploded perspective view of the shaft attachment portion 15 of the guide link 10. At the outer edge of the bent portion, there is a short shaft neck portion 25a that fits into the shaft hole 13b of the interlocking link 13, and a shaft seat 25 having substantially the same thickness as the plate thickness of the guide link 10 is fixed by welding. .

  The shaft seat 25 is formed with a screw hole 25b penetrating the center portion of the shaft neck portion 25a, and the screw hole 25b has a flange 26a having a larger diameter than the shaft neck portion 25a. 26 screw portions 26b are screwed.

  Further, the shaft neck portion 25a is formed so that its length is slightly longer than the thickness of the interlocking link 13, and as shown in FIG. 9, the shaft is fixed to the guide links 10 disposed on the left and right sides of the arm 2. The shaft hole 13b of the interlocking link 13 is fitted in the shaft neck portion 25a of the seat 25, and the hooked bolt 26 is fastened and fixed to the shaft neck portion 25a, whereby the interlocking link 13 and the guide link 10 are rotated. It is connected freely.

  Next, a procedure for removing the grip attachment 11 attached as described above from the arm 2 of the backhoe 1 will be described. In removing the grip attachment 11, as shown in FIG. 1, the front end side of the arm 2 is directed downward, and the free end (tip end) side of the grip attachment 11 is located below the connecting shaft 12 and near the ground surface. In the state where the arm 2 is lowered, the left and right interlocking links 13 are separated from the shaft attachment portions 15 of the guide links 10 respectively.

  In this operation, the hooked bolts 26 are removed from the shaft seats 25 of the left and right guide links 10 shown in FIG. 9, and the respective interlocking links 13 are separated from the shaft neck portions 25a. Next, after removing the fixing bolt 19 from the arm nut 18 screwed to the connecting shaft 12, the arm nut 18 is rotated and removed from the connecting shaft 12.

Next, the grip attachment 11 is slightly lifted, and the connecting shaft 12 is pulled out to the right in FIG. 9 while preventing the weight of the grip attachment 11 from being added to the inner peripheral surface of the bearing hole 16a of the bearing cylinder 16.
When the weight of the gripping attachment 11 is small, the bearing barrel 16 is lifted so that the engaging portions 21 provided on the inner surfaces of the pair of gripping forks 11a do not hit the outer peripheral surface of the bearing barrel 16 as they are. If it is pulled out to the side, it can be removed from the arm 2 of the backhoe 1.

  When the weight of the grip attachment 11 is large, after the connecting shaft 12 is pulled out, the inner peripheral surface of the engaging portion 21 is engaged with the outer peripheral surfaces of both ends of the bearing cylinder 16 as shown in FIG. Thus, it is desirable from the viewpoint of safety that the weight of the grip attachment 11 is once supported by the bearing cylinder 16, and thereafter, the grip attachment 11 is held with both hands and the engaging portion 21 is detached from the bearing cylinder 16.

  On the other hand, the procedure for attaching the grip attachment 11 to the arm 2 of the backhoe 1 is basically the reverse of the above-described removal procedure, but when the connecting shaft 12 is mounted, the rotation formed on the head 12a thereof. It is necessary to engage the movement restricting surface 12c with the receiving surface 17a of the boss 17 fixed around the shaft hole 11b of one gripping fork 11a.

  In addition, when performing the operation | work which attaches / detaches the attachment 11 to the arm 2 of the backhoe 1, even if the operator holding the attachment 11 slides a hand, the above-mentioned engaging part 21 is a bearing. Since the weight of the gripping attachment 11 is received by the bearing tube 16 by engaging with the tube 16, a fall accident can be prevented in advance.

  Further, in the embodiment described above, the attachment 11 can be easily used by simply welding the bearing cylinder 16 to the arm 2 of the ready-made backhoe 1 and welding the shaft seat 25 to the guide link 10. Therefore, the use range of the ready-made backhoe can be easily expanded.

  Depending on the backhoe, the guide link is a straight one that is not bent in a “<” shape like the guide link 10 described above, but for such a backhoe, a shaft seat is used. For example, it is possible to cope with this by forming the shaft neck portion in a triangular shape with the apex located at the apex and welding the base portion along the side edge of the guide link.

  The following invention can be understood from the description of the present specification.

(Item 1)
A proximal end side is provided so as to be rotatable and detachable in the vicinity of the arm portion of the backhoe where the bucket is rotatably provided, and the free end side is operated in cooperation with the bucket to grip the object to be grasped. A mounting structure for the grip attachment to be performed,
A substantially cylindrical bearing cylinder having a bearing hole penetrating through the center at a position near the tip of the arm has an axial direction perpendicular to the longitudinal direction of the arm and both end surfaces from the left and right side surfaces of the arm. Each is fixed to protrude slightly,
The grip attachment has a pair of left and right plate-like gripping forks, at least the base end side of which is integrally connected at opposing intervals matching the length of the bearing cylinder,
A shaft hole is formed on the base end side of each of the pair of gripping forks so as to be aligned with the bearing hole of the bearing cylinder, and around the shaft holes on the inner surfaces of the gripping forks facing each other. Each is provided with an arcuate engaging portion in which a part of the outer peripheral surface of the bearing cylinder and the inner peripheral surface face each other
The grip attachment is connected to the arm by positioning a base end side of the pair of gripping forks on both sides of the bearing cylinder and inserting a connecting shaft into each shaft hole and the bearing hole of the bearing cylinder. The mounting attachment of the backhoe characterized in that in the state where the connecting shaft is pulled out from the bearing hole, the respective engaging portions engage with the outer peripheral surfaces of both ends of the bearing cylinder to prevent the grip attachment from falling. Construction.

(Item 2)
In the backhoe grip attachment mounting structure described in item 1 above,
The backhoe is provided with a telescopic rod tip of a hydraulic cylinder device that rotates the bucket at both ends, and a guide link that is pivotally attached to the arm. An interlocking link is provided between the guide link and the grip attachment. The grip attachment is configured to rotate in conjunction with the direction opposite to the direction of rotation of the bucket by the linked link, and the linked link is detachably attached to the guide link. A structure for attaching a backhoe gripping attachment, characterized by being made.

  1 .... backhoe, 2 .... arm, 2a ... lower surface, 2b, 2c ... side, 3. bucket, 3a ... hanging hook, 3b ... fork claw, 4 .... shaft, 5 .... connecting link, 6 .... shaft, 7 .... shaft, 8 .... hydraulic cylinder, 8a ... telescopic rod, 9 .... shaft, 10 .... guide link, 11 .... grab attachment, 11a ... grab fork, 11b ... shaft hole 11c ··· Fixing bolt through hole, 11d · · shaft hole, 12 · · connecting shaft, 12a · · head, 12b · · screw portion, 12c · · rotation restricting surface, 13 · · interlocking link, 13a · · · Shaft hole, 13b ... Shaft hole, 14 ... Shaft mounting part, 15 ... Shaft mounting part, 16 ... Bearing cylinder, 16a ... Bearing hole, 16b ... Flat surface, 17 ... Boss, 17a ... Reception surface, 18 ... Nut with arm, 18a .. Arm, 18b ... Hole, 19 ... Fixing bolt, 20 ... Nut, 21 ... Engagement part, 22 ... Shaft bolt, 22a ... Bolt head, 22b ... Screw, 23 ... Nut 24 .. Connecting member 25 .... Shaft seat 25a ... Shaft neck 25b ... Screw hole 26 ... Bolt bolt 26a ... Rib 26b ... Screw part

Claims (2)

At the position near the tip of the backhoe arm where the bucket is pivotably provided, the proximal end side is pivotably and detachably provided, and the free end side cooperates with the bucket to grip the object to be grasped. The attachment structure of the grip attachment that performs
In the vicinity of the tip of the arm, a substantially cylindrical bearing cylinder with a bearing hole penetrating in the center is oriented so that its axial direction is perpendicular to the longitudinal direction of the arm and both end surfaces are on the left and right sides of the arm. Fixed to protrude from the side,
The grip attachment has a pair of left and right plate-like gripping forks, at least the base end side of which is integrally connected at opposing intervals matching the length of the bearing cylinder,
A shaft hole is formed on the base end side of each of the pair of gripping forks so as to be aligned with the bearing hole of the bearing cylinder, and around the shaft holes on the inner surfaces of the gripping forks facing each other. Each is provided with an arcuate engaging portion in which a part of the outer peripheral surface of the bearing cylinder and the inner peripheral surface face each other
The grip attachment is connected to the arm by positioning a base end side of the pair of gripping forks on both sides of the bearing cylinder and inserting a connecting shaft into each shaft hole and the bearing hole of the bearing cylinder. The mounting attachment of the backhoe characterized in that in the state where the connecting shaft is pulled out from the bearing hole, the respective engaging portions engage with the outer peripheral surfaces of both ends of the bearing cylinder to prevent the grip attachment from falling. Construction. At the position near the tip of the backhoe arm where the bucket is pivotably provided, the proximal end side is pivotably and detachably provided, and the free end side cooperates with the bucket to grip the object to be grasped. The attachment structure of the grip attachment that performs
The backhoe includes guide links that are pivotally attached to the ends of the telescopic rods of the hydraulic cylinder device that rotates the bucket, and the arms, respectively.
The attachment structure of the grip attachment is
A substantially cylindrical bearing cylinder fixed to the arm and having a bearing hole penetrating the center;
A pair of left and right gripping forks constituting the gripping attachment;
An engagement portion provided around each shaft hole of the opposing surfaces of the pair of gripping forks, and a part of the outer peripheral surface of the bearing cylinder and the inner peripheral surface thereof;
With
The grip attachment is rotatably connected to the arm by inserting a connecting shaft into each of the shaft hole and the bearing hole,
The link between the guide link and the grip attachment is connected by an interlocking link,
The grip attachment is configured to rotate in conjunction with a direction opposite to the rotation direction of the bucket by the interlocking link,
The backhoe grip attachment mounting structure, wherein the interlocking link is removably attached to the guide link.

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