JP4897719B2 - Bucket link with hook - Google Patents

Description

  The present invention relates to a bucket link that connects a bucket cylinder and a bucket of a hydraulic excavator, and more particularly, to a bucket link with a hook to which a hook for carrying a suspended load is attached.

  In general, a hydraulic excavator that is suitably used for excavation work such as earth and sand is provided with a working device including a boom, an arm, a bucket, and the like on the front side of the upper swing body, the boom is moved up and down by the boom cylinder, and the arm is lifted by the arm cylinder. It is configured to perform excavation work such as earth and sand by rotating the bucket on the tip end side of the arm by the bucket cylinder while moving.

  Further, as a bucket link for connecting the bucket cylinder and the bucket, a bucket link with a hook provided with a hook for carrying a relatively light load is known. The hydraulic excavator provided with the bucket link with the hook stores the hook in a hook storage space formed inside the bucket link when excavating earth and sand, and when performing the lifting work, the bucket link The hook is taken out from the hook storage space and the luggage is lifted by this hook (for example, see Patent Document 1).

JP 2000-95475 A

  And the bucket link with a hook by a prior art is arrange | positioned at intervals in the left and right direction, a 1st boss part is provided in the one end side of a length direction, and a 2nd boss part is provided in the other end side. Left and right link plates, a first connecting shaft for connecting the first boss portion provided on each link plate and the bucket cylinder, and a second boss portion provided on each link plate A second connecting shaft that connects the bucket and the bucket, a storage position that is supported by the second connecting shaft and that is disposed in the hook storage space formed between the link plates, and is taken out of the hook storage space And a hook holding means for holding the hook in the retracted position.

  Here, the hook holding means is movably inserted into one of the link plates and is inserted into a hook part of the hook, and is provided in the hook storage space and movably supports the holding pin. A pin support member and a retaining pin that is removably attached to the holding pin are generally configured, and the holding pin is formed as a single rod-like body that can be carried. Then, with the holding pin inserted through one of the link plates being inserted into the hook collar, the tip end side of the holding pin is supported by the pin support member, and the retaining pin is attached to the holding pin in the axial direction. The hook can be held in the hook storage space by the holding pin.

  However, the above-described bucket link with hook according to the prior art is formed as a single rod-like body capable of carrying the holding pin, the base end side of this holding pin is inserted into one link plate, and the tip side is a pin support member In such a state that the holding pin is inserted into the distal end side of the holding pin in the state where the holding pin is supported, the holding pin is held in the axial direction with respect to the pin support member and the link plate.

  For this reason, for example, when performing excavation work with the hook held in the retracted position by the holding pin, the retaining pin may be detached from the holding pin and lost due to vibration during the excavation work. In this case, the holding pin cannot be pulled out in the axial direction, and the holding pin is pulled out from the pin support member and the link plate. In addition, during loading work using a hook, the retaining pin may be lost due to human error such as the operator removing the retaining pin from the holding pin and then forgetting it on the work site. .

  In this way, the retaining pin is detached from the holding pin and lost, and the retaining pin is lost when it is pulled out from the pin support member or link plate, or because of a human error such as forgetting to place the removed retaining pin. In this case, the hook cannot be held in the storage position. As a result, the excavation work is performed with the hooks always protruding from the hook storage space of the bucket link, which not only lowers the workability of the excavation work but also causes problems such as breakage of the hooks.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a bucket link with a hook that can securely hold the hook in the hook storage space of the bucket link. .

  In order to solve the above-described problems, the present invention is provided with a spacing in the left and right directions, a first boss portion is provided on one end side in the length direction, and a second boss portion is provided on the other end side. Left and right link plates, a first connecting shaft for connecting between the first boss portion and a bucket cylinder provided on one end side in the length direction of each link plate, and each link plate Between the second boss portion provided on the other end side in the length direction and the bucket and the second boss portion provided on each of the link plates. Then, it is movable between a storage position supported in the second connecting shaft and disposed in a hook storage space formed between the link plates and a work position taken out of the hook storage space. And a hook holding means for holding the hook in the retracted position. It is applied to the bucket link attached.

  The invention of claim 1 is characterized in that the hook holding means is movably inserted into one of the link plates and inserted into the hook of the hook when the hook is in the retracted position. A holding pin to be fitted, a pin support member provided in the hook storage space and supporting the front end side of the holding pin, and a shaft of the holding pin by being attached to the pin supporting member and engaging with the holding pin It is constituted by a pin lock mechanism that is switched between a locked state that prohibits movement in the direction and a lock release state that allows movement of the holding pin by detaching from the holding pin.

  According to a second aspect of the present invention, the holding pin has a small-diameter portion that is movably inserted into a pin insertion hole provided in one of the link plates, and has a larger diameter than the pin insertion hole. A large-diameter portion disposed in the storage space is provided, and an engaging portion is provided on the outer peripheral surface of the large-diameter portion to engage and disengage the pin lock mechanism.

  According to a third aspect of the present invention, the pin lock mechanism includes a base member attached to the pin support member, a lock position which is supported by the base member and engages with an engagement portion provided on the holding pin, and the engagement. A stopper that moves between the unlocking position and the base member, and a biasing means that constantly biases the stopper toward the locking position. is there.

  According to a fourth aspect of the present invention, the stopper is provided with a lock release lever for moving the stopper from the lock position to the lock release position against the biasing means.

  According to the first aspect of the present invention, when the pin lock mechanism is switched to the locked state, the holding pin inserted into the hook flange in the hook storage space is prohibited from moving in the axial direction, and the hook is stored. Can be held in position. On the other hand, when the pin lock mechanism is switched to the unlocked state, the holding pin is moved in the axial direction and removed from the hook part of the hook, so that the hook can be taken out to the working position and a hanging work or the like can be performed. In this case, since the pin lock mechanism is attached to the pin support member, the pin lock mechanism is not detached from the holding pin and lost. Therefore, the hook can be securely held in the storage position by locking the holding pin by the pin lock mechanism. As a result, for example, at the time of excavation work using a bucket, the hooks do not inadvertently fly out of the hook storage space of the bucket link, so that breakage of the hook can be prevented and workability of excavation work can be improved.

  According to the second aspect of the present invention, the holding pin can be retained in the axial direction by engaging the pin lock mechanism with the engaging portion provided in the large diameter portion of the holding pin. Can be held in the storage position. On the other hand, the hook is moved from the hook storage space to the working position by detaching the pin lock mechanism from the engaging portion provided in the large diameter portion of the holding pin, moving the holding pin in the axial direction, and removing it from the hook flange. And can be taken out.

  In this case, since the large-diameter portion of the holding pin has a larger diameter than the pin insertion hole of the link plate through which the small-diameter portion of the holding pin is inserted, the holding pin is carelessly removed from the link plate through the pin insertion hole of the link plate. There is no withdrawal. As a result, loss of the holding pin can be reliably prevented, and the hook can be reliably held at the storage position by the holding pin.

  According to the invention of claim 3, since the stopper can be constantly biased toward the lock position by the biasing means provided between the base member and the stopper, the stopper is placed on the engaging portion of the holding pin. It can be engaged in the pressed state. As a result, it is possible to prevent the stopper from being inadvertently detached from the engaging portion of the holding pin due to vibration during excavation work using a bucket, for example, and the hook is securely held in the storage position by the holding pin. can do.

  According to the invention of claim 4, the stopper pressed against the lock position by the urging means can be easily moved to the lock release position against the urging means by operating the lock release lever. The workability when the hook is taken out from the storage position to the work position can be improved.

  Hereinafter, embodiments of a bucket link with a hook according to the present invention will be described in detail with reference to the accompanying drawings.

  In the figure, reference numeral 1 denotes a hydraulic excavator provided with a bucket link with a hook according to the present embodiment. The hydraulic excavator 1 is capable of a self-propelled crawler-type lower traveling body 2 and can turn on the lower traveling body 2. The upper swing body 3 mounted and the work device 4 provided on the front side of the upper swing body 3 are roughly configured.

  The working device 4 is attached to the upper swing body 3 so as to be able to move up and down, an arm 6 attached to the tip side of the boom 5 so as to move up and down, and attached to the tip side of the arm 6 so as to be rotatable. The bucket 7, the boom cylinder 8 that drives the boom 5, the arm cylinder 9 that drives the arm 6, the bucket cylinder 10 that drives the bucket 7, and the like, and performs excavation work of earth and sand.

  Here, the bucket 7 is configured as a backhoe-type bucket, and a pair of brackets 7A (only the left side is shown) spaced apart in the left and right directions are provided on the bottom plate of the bucket 7. The bucket 7 is rotatably supported on the distal end side of the arm 6 by a connecting shaft 11 inserted between the brackets 7A.

  Reference numerals 12 and 12 denote left and right arm links as first bucket links which are spaced apart in the left and right directions between the arm 6 and the rod 10 </ b> A of the bucket cylinder 10. The end side is connected to the arm 6 by a connecting shaft 13, and the tip side is connected to the tip of the rod 10A of the bucket cylinder 10 by a first connecting shaft 22 described later.

  Reference numeral 14 denotes a bucket link with a hook according to the present embodiment as a second bucket link, and the bucket link 14 with a hook is provided between the rod 10 </ b> A of the bucket cylinder 10 and the bracket 7 </ b> A of the bucket 7. 2 to 4 and the like, the left and right link plates 15, 18, the first and second connecting shafts 22, 23, the hanging load hook 24, the hook, It is comprised by the holding means 30 grade | etc.,.

  Reference numeral 15 denotes a left link plate that constitutes the bucket link 14 with a hook, and the left link plate 15 is disposed with a certain distance in the left and right directions from a later-described right link plate 18. Here, the left link plate 15 is substantially constituted by a web plate 15A having a substantially triangular shape and a reinforcing flange plate 15B fixed to an edge of the web plate 15A, and extends in the front and rear directions. Yes. Further, a cylinder side boss 16 described later is provided on one end side in the length direction of the left link plate 15, and a bucket side boss 17 described later is provided on the other end side in the length direction.

  2 and 5 and the like, the web plate 15A of the left link plate 15 is formed with a single pin insertion hole 15C through which a holding pin 31 (described later) is inserted in the plate thickness direction. ing. Further, as shown in FIG. 2, a hook receiving projection 15 </ b> D projects from an inner side surface of the web plate 15 </ b> A of the left link plate 15 that faces a later-described right link plate 18.

  Reference numeral 16 denotes a cylinder-side boss as a first boss portion fixed to one end side of the left link plate 15 in the lengthwise direction by welding. The cylinder-side boss 16 is formed in a cylindrical shape and has a bush on the inner peripheral side thereof. 16A is inserted. And the cylinder side boss | hub 16 is connected with the rod 10A front end side of the bucket cylinder 10 via the 1st connection shaft 22 mentioned later so that rotation is possible.

  Reference numeral 17 denotes a bucket-side boss as a second boss portion fixed to the other end side in the length direction of the left link plate 15 by welding. The bucket-side boss 17 is formed in a cylindrical shape on the inner peripheral side thereof. A bush 17A is inserted. And the bucket side boss | hub 17 is connected with the bracket 7A of the bucket 7 through the 2nd connection shaft 23 mentioned later so that rotation is possible.

  Reference numeral 18 denotes a right link plate disposed with a left and right spacing with the left link plate 15. The right link plate 18 is paired with the left link plate 15 in the left and right directions. Here, like the left link plate 15, the right link plate 18 is roughly constituted by a substantially triangular web plate 18A and a reinforcing flange plate 18B fixed to the edge of the web plate 18A. , Extending in the forward and backward directions. Further, a cylinder side boss 19 described later is provided on one end side in the length direction of the right link plate 18, and a bucket side boss 20 described later is provided on the other end side in the length direction.

  As shown in FIGS. 2 and 5 and the like, a plurality of female screw holes 18C, 18C,... For attaching a pin support member 34 to be described later are screwed on the web plate 18A of the right link plate 18. Further, as shown in FIG. 2, hook receiving projections 18 </ b> D are provided on the inner surface of the web plate 18 </ b> A of the right link plate 18 that faces the left link plate 15, and the left and right link plates 15, 18 The hook hooks 15D and 18D are configured to position a later-described hanging hook 24 at the storage position shown in FIG.

  Reference numeral 19 denotes a cylinder-side boss as a first boss portion fixed to one end side of the right link plate 18 in the length direction by welding. The cylinder-side boss 19 is formed in a cylindrical shape and has a bush on the inner peripheral side thereof. 19A is inserted. And the cylinder side boss | hub 19 is connected with the rod 10A front end side of the bucket cylinder 10 via the 1st connection shaft 22 mentioned later so that rotation is possible.

  Reference numeral 20 denotes a bucket-side boss as a second boss portion fixed to the other end side in the length direction of the right link plate 18 by welding, and the bucket-side boss 20 is formed in a cylindrical shape on the inner peripheral side thereof. A bush 20A is inserted. And the bucket side boss | hub 20 is connected with the bracket 7A of the bucket 7 via the 2nd connection shaft 23 mentioned later so that rotation is possible.

  Reference numeral 21 denotes a hook storage space formed between the left and right link plates 15 and 18. The hook storage space 21 stores a hanging load hook 24 described later. In the hook storage space 21, a hook holding means 30 (described later) for holding the hanging hook 24 in the storage position is arranged.

  Reference numeral 22 denotes a first connecting shaft, and the first connecting shaft 22 is formed between the cylinder-side bosses 16 and 19 provided on one end side in the length direction of the left and right link plates 15 and 18 and the bucket cylinder 10. The space is pivotably connected. Here, as shown in FIG. 2, the first connecting shaft 22 inserts the tip of the rod 10 </ b> A of the bucket cylinder 10 between the left and right cylinder side bosses 16 and 19, and the left and right arm links 12 and 12. With the cylinder side bosses 16 and 19 sandwiched from the left and right directions, the left and right cylinder side bosses 16 and 19, the rod 10 </ b> A of the bucket cylinder 10, and the left and right arm links 12 and 12 rotate relative to each other. It is configured to be inserted through.

  Reference numeral 23 denotes a second connecting shaft. The second connecting shaft 23 is a bracket of the bucket side bosses 17 and 20 provided on the other end side in the length direction of the left and right link plates 15 and 18 and the bracket of the bucket 7. 7A is pivotally connected to 7A. Here, as shown in FIG. 2, the second connecting shaft 23 is inserted with hook bosses 25 to be described later between the left and right bucket-side bosses 17 and 20, and the left and right brackets 7 </ b> A of the bucket 7. 7A, with the bucket bosses 17 and 20 sandwiched from the left and right directions, the left and right bucket bosses 17 and 20, the hook boss 25, and the bracket 7A of the bucket 7 are inserted so as to be relatively rotatable. It is the composition which becomes.

  Reference numeral 24 denotes a hanging hook that is positioned between the left and right bucket-side bosses 17 and 20 and is swingably supported by the second connecting shaft 23. This hanging hook 24 is used for excavating the excavator 1, for example. In some cases, the storage position (the position shown in FIG. 3) stored in the hook storage space 21 of the bucket link 14 with the hook is held by a hook holding means 30 to be described later. As shown in FIGS. It moves to the work position taken out of the bucket link 14 with the hook. The suspended load hook 24 includes a hook boss 25, a bracket 26, a joint member 27, a support shaft 28, a flange 29, and the like which will be described later.

  A cylindrical hook boss 25 is disposed between the left and right bucket-side bosses 17 and 20 and is rotatably supported by the second connecting shaft 23. A bush 25A is provided on the inner peripheral side of the hook boss 25. Is inserted, and the second connecting shaft 23 is slidably inserted into the inner peripheral side of the bush 25A. A pair of brackets 26 and 26 protrude from the outer peripheral side of the hook boss 25 by welding, and these brackets 26 face each other at a constant interval.

  Reference numeral 27 denotes a joint member that connects between each bracket 26 and a later-described flange portion. The joint member 27 includes a boss portion 27A disposed between the brackets 26 and a cylindrical portion integrally formed with the boss portion 27A. 27B. The boss portion 27 </ b> A of the joint member 27 is rotatably supported between the brackets 26 by a support shaft 28 extending in a direction substantially orthogonal to the second connecting shaft 23. On the other hand, a thrust bearing (not shown) is disposed in the cylindrical portion 27B of the joint member 27, and a proximal end side of a flange portion 29 described later can rotate in the cylindrical portion 27B of the joint member 27 via the thrust bearing. It is configured to be attached to.

  Reference numeral 29 denotes a flange portion rotatably attached to the cylindrical portion 27B of the joint member 27 via a thrust bearing (not shown). The flange portion 29 pulls a wire rope (not shown) or the like during a lifting operation. It is something to hang. Further, the collar portion 29 is provided with a retaining member 29A that prevents the wire rope or the like from being inadvertently pulled out from the collar portion 29.

  30 is a hook holding means provided in the hook storage space 21 of the bucket link 14 with the hook, and the hook holding means 30 is a storage position (position of FIG. 3) where the hanging load hook 24 is stored in the hook storage space 21. It is something to hold. The hook holding means 30 includes a holding pin 31, a pin support member 34, a pin lock mechanism 37, and the like, which will be described later, as shown in FIGS.

  Reference numeral 31 denotes a holding pin that is movably inserted into the left link plate 15 of the left and right link plates 15 and 18, and the holding pin 31 holds the hanging load hook 24 in the storage position shown in FIG. To do. Here, as shown in FIGS. 5 and 6, the holding pin 31 has a small-diameter portion 31 </ b> A that is movably inserted into the pin insertion hole 15 </ b> C of the left link plate 15 and a diameter larger than the hole diameter of the pin insertion hole 15 </ b> C. A large-diameter portion 31 </ b> B having a diameter and arranged in the hook storage space 21 is roughly configured.

  Further, an engaging groove 31C as an engaging portion with which a stopper 40 described later is engaged is formed in an annular shape over the entire circumference on the outer peripheral surface of the large diameter portion 31B. Further, the distal end portion 31D of the holding pin 31 is chamfered in a tapered shape, and the distal end portion 31D is configured to abut on an inclined surface 40C of a stopper 40 described later. On the other hand, as shown in FIG. 5, a portion of the small diameter portion 31 </ b> A that protrudes from the left link plate 15 becomes a knob portion 31 </ b> E, and the knob portion 31 </ b> E pulls out the holding pin 31 from the flange portion 29 of the hanging load hook 24. This is what the operator picks.

  As shown in FIG. 5, the holding pin 31 is inserted into the collar portion 29 of the hanging hook 24, and the tip end side (large diameter portion 31 </ b> B side) is supported by a pin support member 34, which will be described later. The load hook 24 is held in the storage position shown in FIG. On the other hand, as shown in FIG. 6, the holding pin 31 moves the large diameter portion 31 </ b> B to the left link plate 15 side and separates it from the flange portion 29 of the hanging hook 24, so that the hanging hook 24 is moved to FIG. 3. It is allowed to move from the storage position shown to the work position shown in FIG.

  In this case, as shown in FIG. 5, assuming that the hole diameter of the pin insertion hole 15C provided in the left link plate 15 is φd and the outer diameter of the large diameter portion 31B of the holding pin 31 is φD, the hole diameter of these pin insertion holes 15C φd and the outer diameter φD of the large-diameter portion 31B of the holding pin 31 are set in the relationship of the following formula 1.

  Accordingly, as shown in FIG. 6, when the holding pin 31 is detached from the flange portion 29 of the hanging hook 24, the large-diameter portion 31B is caught by the pin insertion hole 15C of the left link plate 15, thereby holding the holding pin 31. The pin 31 can be prevented from being detached from the hooked bucket link 14 and lost.

  A guide cylinder 32 is fixed to the inner surface of the left link plate 15 on the hook storage space 21 side. The guide cylinder 32 is formed in a thick cylindrical shape, and the inner peripheral side has a large diameter of the holding pin 31. It is a guide hole 32A through which the portion 31B is inserted. The guide hole 32A of the guide cylinder 32 is arranged concentrically with the pin insertion hole 15C of the left link plate 15, and the large-diameter portion 31B of the holding pin 31 faces a pin insertion hole 34E of the pin support member 34 described later. To guide you.

  A protective cylinder 33 is fixed to the outer surface of the left link plate 15 opposite to the hook storage space 21. The protective cylinder 33 is formed in a thin cylindrical shape, and the pin insertion hole 15C of the left link plate 15 is provided. And are arranged almost concentrically. The protective cylinder 33 holds the hanging hook 24 in the retracted position so that when the holding pin 31 is inserted into the flange 29 of the hanging hook 24 as shown in FIG. The knob 31E of the holding pin 31 protruding to the periphery is surrounded from the outer peripheral side, and the knob 31E is protected from earth and sand during excavation work.

  Reference numeral 34 denotes a pin support member provided in the hook storage space 21. The pin support member 34 supports the distal end side (large diameter portion 31B side) of the holding pin 31 and a pin lock mechanism 37 to be described later. Is.

  Here, as shown in FIGS. 5 to 7, the pin support member 34 has a rectangular flat plate shape, and a support plate portion 34 </ b> A that faces the web plate 18 </ b> A of the right link plate 18 at a certain interval, and the support plate portion. A pair of leg portions 34B and 34B which are bent from both upper and lower ends of 34A and extend toward the web plate 18A, and a pair of flange portions 34C which are bent from the tip side of each leg portion 34B and abut against the web plate 18A, 34C. Further, each flange portion 34C is provided with bolt insertion holes 34D, 34D corresponding to the female screw holes 18C of the right link plate 18, and the bolts 35 inserted into the respective bolt insertion holes 34D are inserted into the female screw holes of the right link plate 18. The pin support member 34 is fixed to the inner side surface on the hook storage space 21 side of the right link plate 18 by being screwed to 18C.

  A pin insertion hole 34E is formed concentrically with the pin insertion hole 15C of the left link plate 15 in the support plate portion 34A of the pin support member 34. The pin insertion hole 34E is a large diameter portion 31B of the holding pin 31. Is inserted. That is, when the holding pin 31 is inserted into the collar portion 29 of the hanging hook 24 to hold the hanging load hook 24 in the retracted position, as shown in FIG. 15 is inserted into the pin insertion hole 15C, and the large-diameter portion 31B of the holding pin 31 is inserted into the pin insertion hole 34E of the pin support member 34 so that the holding pin 31 is connected to the left link plate 15 and the pin support member 34. Thus, it is configured to stably support in a both-sided state.

  Further, a groove-shaped notch 34F into which a lock release lever 42 described later is inserted is formed on one leg 34B of the pin support member 34. Furthermore, a rectangular plate-like spacer 36 located near the pin insertion hole 34E is welded to the surface of the support plate portion 34A of the pin support member 34 that faces the web plate 18A of the right link plate 18. In the spacer 36, two female screw holes 36A and 36A for attaching a base member 38 to be described later are screwed.

  Reference numeral 37 denotes a pin lock mechanism integrally attached to the pin support member 34. The pin lock mechanism 37 engages with the holding pin 31 to lock the holding pin 31 in the axial direction (FIG. 8). And the unlocked state (state shown in FIG. 9) allowing the movement of the holding pin 31 by detaching from the holding pin 31. Here, as shown in FIGS. 7 to 11 and the like, the pin lock mechanism 37 includes a base member 38, a stopper 40, a compression spring 41, a lock release lever 42 and the like which will be described later.

  Reference numeral 38 denotes a base member serving as a base of the pin lock mechanism 37. The base member 38 is attached to the spacer 36 of the pin support member 34, and supports a stopper 40 described later so as to be movable. Here, as shown in FIGS. 7 to 9 and the like, the base member 38 is formed by, for example, bending a steel plate material and the like, and a bottom plate 38A that contacts the spacer 36 and a front end side of the bottom plate 38A. A front plate 38B bent at a right angle toward the right link plate 18, and a rear plate bent at a right angle from the rear end side of the bottom plate 38A toward the right link plate 18 and facing the front plate 38B in the front and rear directions. 38C.

  Bolt insertion holes 38D and 38D corresponding to the female screw holes 36A of the spacer 36 are formed in the bottom plate 38A of the base member 38, and the bolts 39 inserted into the bolt insertion holes 38D are inserted into the female screw holes 36A of the spacer 36. The base member 38 is attached to the pin support member 34 via the spacer 36. Further, a projection piece 38E bent at a right angle toward the right link plate 18 is provided at the center of the bottom plate 38A, and the projection piece 38E is engaged with a recessed portion 40E of a stopper 40 described later. It has become.

  On the other hand, a square-shaped square hole 38F is formed in the front plate 38B of the base member 38, and a rectangular column portion 40A of a stopper 40 described later is slidably inserted into the square hole 38F. Yes. A circular hole 38G is formed concentrically with the square hole 38F in the rear plate 38C of the base member 38, and a cylindrical portion 40B of a stopper 40 described later is slidably inserted into the circular hole 38G. It is the composition which becomes.

  Reference numeral 40 denotes a stopper supported by the base member 38. The stopper 40 is moved in the axial direction (front and rear directions) of the holding pin 31 so as to approach and separate from the holding pin 31 as shown in FIGS. And move in a direction substantially perpendicular to the direction. Here, the stopper 40 is formed in a rectangular parallelepiped shape that extends in the front and rear directions as a whole, and the prism 40A that is slidably inserted into a square hole 38F formed in the front plate 38B of the base member 38; The cylindrical portion 40B is fixed to the rear end portion of the prismatic portion 40A, extends in the front and rear directions, and is slidably inserted into a circular hole 38G formed in the rear plate 38C of the base member 38. .

  In addition, an inclined surface 40C that is inclined with respect to the axial center of the holding pin 31 and is in contact with the distal end portion 31D of the holding pin 31 is provided on the distal end side of the prismatic column portion 40A of the stopper 40. A wedge-shaped engagement end portion 40D that engages and disengages from the engagement groove portion 31C of the pin 31 is formed. Further, a groove-like recessed portion 40E that engages with the protruding piece 38E is recessed in a portion of the prism 40A of the stopper 40 that faces the protruding piece 38E of the base member 38, as shown in FIG. The rear end portion 40F of the recessed portion 40E abuts against the protruding piece 38E, thereby restricting the movement of the stopper 40 in the direction approaching the holding pin 31, and as shown in FIG. 9, the front end of the recessed portion 40E The portion 40G is in contact with the protruding piece 38E, so that the movement of the stopper 40 in the direction away from the holding pin 31 is limited.

  As described above, the stopper 40 is inserted in the square hole 40F of the base member 38 through the rectangular column portion 40A, and inserted in the circular hole 38G of the base member 38 in the circumferential direction by inserting the column portion 40B into the circular hole 38G. It moves toward and away from the holding pin 31.

  As shown in FIG. 8, the engaging end 40 </ b> D of the stopper 40 is in a state where the rear end 40 </ b> F of the recessed portion 40 </ b> E provided in the stopper 40 is in contact with the protruding piece 38 </ b> E of the base member 38. The holding pin 31 is fixed at the locked position engaged with the engaging groove 31C. Accordingly, as shown in FIG. 5, the holding pin 31 is locked while being fitted in the hook portion 29 of the hanging hook 24 in the hook storage space 21, and the holding pin 31 is moved in the axial direction. By prohibiting, the hanging load hook 24 can be held at the storage position shown in FIG.

  On the other hand, as shown in FIG. 9, the front end portion 40G of the recessed portion 40E provided in the stopper 40 abuts on the protruding piece 38E of the base member 38, so that the engaging end portion 40D of the stopper 40 has a holding pin. It moves to the unlocking position where it disengages from the engaging groove 31C of 31. Then, the operator picks the knob 31E of the holding pin 31 shown in FIG. 5, moves the holding pin 31 in the direction away from the pin support member 34, as shown in FIG. By detaching from 29, the hanging hook 24 can be moved from the storage position shown in FIG. 3 to the work position shown in FIG.

  Reference numeral 41 denotes a compression spring as an urging means provided between the stopper 40 and the rear plate 38C of the base member 38. The compression spring 41 constantly urges the stopper 40 toward the lock position shown in FIG. Is. Here, the compression spring 41 is disposed on the outer peripheral side of the cylindrical portion 40B of the stopper 40, and one end side thereof abuts on the prismatic portion 40A of the stopper 40 and the other end side abuts on the rear plate 38C of the base member 38. The stopper 40 is pressed toward the lock position by the spring force.

  Reference numeral 42 denotes a lock release lever provided at the rear end of the stopper 40. The lock release lever 42 resists the spring force of the compression spring 41 against the stopper 40 that is constantly biased to the locked position by the compression spring 41. In order to move it to the unlocking position, it is operated by an operator. Here, as shown in FIGS. 7 to 9, the lock release lever 42 is composed of a rod-like body bent into an L shape as a whole, and has a larger outer diameter than the circular hole 38 </ b> G of the base member 38. 40 (cylindrical portion 40B) is configured by a cylindrical mounting portion 42A into which a rear end portion is inserted, and an operation portion 42B bent upward from the mounting portion 42A.

  Then, the rear end portion of the stopper 40 (cylindrical portion 40B) protruding to the rear side of the rear plate 38C through the circular hole 38G of the base member 38 is inserted into the mounting portion 42A of the lock release lever 42, and means such as welding and caulking The lock release lever 42 is integrally fixed to the rear end portion of the stopper 40, and the operation portion 42 </ b> B of the lock release lever 42 supports the pin through the notch 34 </ b> F provided in the pin support member 34. The structure protrudes to the outside of the member 34.

  Accordingly, in the state where the stopper 40 holds the lock position shown in FIG. 8 by the compression spring 41, the operation portion 42B of the lock release lever 42 is moved in the direction indicated by the arrow F in FIGS. Thus, the stopper 40 is moved to the unlocking position shown in FIG. 9 against the spring force of the compression spring 41, and the engagement end portion 40D of the stopper 40 is easily detached from the engagement groove portion 31C of the holding pin 31. It has a configuration that can.

  The bucket link 14 with a hook according to the present embodiment has the above-described configuration. Next, a case where a lifting work is performed by the excavator 1 provided with the bucket link 14 with a hook will be described.

  First, as shown in FIG. 3, the hanging load hook 24 holds the storage position stored in the hook storage space 21, and a holding pin 31 is inserted into the flange portion 29 of the hanging load hook 24. 5 and 8, the large-diameter portion 31B of the holding pin 31 is inserted into the pin insertion hole 34E of the pin support member 34, and the engagement groove 31C of the holding pin 31 is engaged with the stopper 40. The end 40D is engaged.

  In this case, the stopper 40 is stabilized at the position where the rear end portion 40F of the recessed portion 40E is in contact with the protruding piece 38E of the base member 38 by the spring force of the compression spring 41 provided between the stopper 40 and the base member 38. ing. Thereby, the stopper 40 is fixed to the lock position where the engagement end portion 40D is engaged with the engagement groove portion 31C of the holding pin 31, and the pin lock mechanism 37 holds the locked state. The storage position shown in FIG. 3 can be stored in a stable state.

  In this state, when the operation portion 42B of the lock release lever 42 is moved in the direction indicated by the arrow F in FIGS. 3, 5, and 8, the stopper 40 resists the spring force of the compression spring 41. 9 is moved to a position where the front end portion 40G of the recessed portion 40E abuts on the protruding piece 38E of the base member 38, that is, the unlocking position shown in FIG.

  As a result, the engaging end 40D of the stopper 40 is disengaged from the engaging groove 31C of the holding pin 31, and the pin lock mechanism 37 is switched from the locked state to the unlocked state. In this state, the operator picks the knob 31E of the holding pin 31 shown in FIG. 5, and moves the holding pin 31 away from the pin support member 34 as shown in FIG. As a result, the holding pin 31 is detached from the flange 29 of the hanging load hook 24, so that the hanging load hook 24 can be moved from the storage position shown in FIG. 3 to the working position shown in FIG.

  At this time, the holding pin 31 released from the collar portion 29 of the hanging load hook 24 protrudes to the outside of the hook storage space 21 along the pin insertion hole 15C of the left link plate 15, but as shown in FIG. The holding pin 31 is provided with a large diameter portion 31B having an outer diameter φD larger than the hole diameter φd of the pin insertion hole 15C. For this reason, as shown in FIG. 6, when the holding pin 31 is detached from the flange portion 29 of the hanging hook 24, the large diameter portion 31 </ b> B is caught by the pin insertion hole 15 </ b> C of the left link plate 15, It is possible to reliably prevent the pin 31 from being detached from the hooked bucket link 14 and lost.

  Then, after moving the hanging hook 24 to the working position shown in FIG. 4, the holding pin 31 is pushed again into the hook storage space 21, and the large-diameter portion 31 </ b> B of the holding pin 31 is moved to the pin support member 34. The pin is inserted into the pin insertion hole 34E. At this time, as shown in FIG. 10, the stopper 40 returns to a position (lock position) where the rear end portion 40 </ b> E of the recessed portion 40 </ b> E is in contact with the protruding piece 38 </ b> E of the base member 38 by the spring force of the compression spring 41. The inclined surface 40C provided on the distal end side of the stopper 40 faces the distal end portion 31D of the holding pin 31.

  For this reason, as shown in FIG. 11, the distal end portion 31D of the holding pin 31 is inclined to the inclined surface of the stopper 40 by further inserting the large diameter portion 31B of the holding pin 31 into the pin insertion hole 34E of the pin support member 34. It abuts against 40C and presses it. Thereby, the stopper 40 moves in a direction away from the holding pin 31 against the spring force of the compression spring 41 in a state where the engaging end portion 40D is pressed against the outer peripheral surface of the holding pin 31. When the engaging groove 31C of the holding pin 31 reaches the position of the engaging end 40D of the stopper 40, the engaging end 40D of the stopper 40 is moved by the spring force of the compression spring 41 as shown in FIG. It automatically engages with the engaging groove 31C of the holding pin 31.

  In this way, the holding pin 31 is inadvertently lost by holding the holding pin 31 again in the locked position and storing it in the hook storage space 21 with the hanging hook 24 moved to the working position. It is possible to prevent the holding pin 31 from colliding with surrounding obstacles and being damaged.

  Then, the suspended load (not shown) is suspended from the suspended load hook 24 moved to the working position via a wire rope or the like, and the upper swing body 3 is swung while the boom 5 and the arm 6 are moved up and down, for example. Thus, it is possible to perform a hanging work for conveying the hanging load to a desired position.

  Next, the case where the suspended load hook 24 is moved from the working position to the retracted position in order to perform excavation work using the bucket 7 will be described.

  In this case, since the holding pin 31 is in the lock position shown in FIG. 8, first, the operation portion 42B of the lock release lever 42 is moved in the direction indicated by the arrow F in FIG. 8, and the stopper 40 is locked as shown in FIG. Move to the release position. Then, the operator picks the knob 31E of the holding pin 31 shown in FIG. 5, moves the holding pin 31 away from the pin support member 34 as shown in FIG. The guide tube 32 is immersed in the guide hole 32A.

  In this state, as shown in FIG. 3, the hanging hook 24 is moved into the hook storage space 21 around the second connecting shaft 23, and is provided on the left and right link plates 15 and 18 shown in FIG. The joint member 27 of the load hook 24 is brought into contact with the hook receiving projections 15D and 18D, and the load hook 24 is positioned at the retracted position.

  Then, the holding pin 31 is pushed again into the hook storage space 21, and the large diameter portion 31 </ b> B of the holding pin 31 is inserted into the pin insertion hole 34 </ b> E of the pin support member 34. At this time, as shown in FIG. 10, the stopper 40 returns to a position (lock position) where the rear end portion 40 </ b> E of the recessed portion 40 </ b> E is in contact with the protruding piece 38 </ b> E of the base member 38 by the spring force of the compression spring 41. However, as described above, when the large-diameter portion 31B of the holding pin 31 is further inserted, the distal end portion 31D of the holding pin 31 contacts and presses the inclined surface 40C of the stopper 40.

  As a result, the stopper 40 moves in a direction away from the holding pin 31 against the spring force of the compression spring 41 in a state where the engaging end portion 40D is pressed against the outer peripheral surface of the holding pin 31. When the engagement groove 31C of 31 reaches the position of the engagement end 40D of the stopper 40, the engagement end 40D of the stopper 40 is automatically held by the spring force of the compression spring 41 as shown in FIG. The pin 31 engages with the engaging groove 31C. Therefore, for example, it is not necessary to attach a split pin, a retaining ring or the like to the holding pin 31 and prevent it from being pulled out in the axial direction, and workability when locking the holding pin 31 can be improved.

  In this manner, the stopper 40 is stabilized at the position where the rear end portion 40F of the recessed portion 40E is in contact with the protruding piece 38E of the base member 38 by the spring force of the compression spring 41. As a result, the stopper 40 can be fixed at the lock position where the engagement end portion 40D is engaged with the engagement groove portion 31C of the holding pin 31, so that the hanging load hook 24 is stable at the retracted position shown in FIG. Can be stored.

  Then, with the hanging load hook 24 held in the retracted position, the boom 7 and the arm 6 are moved up and down by the boom cylinder 8 and the arm cylinder 9 and the bucket 7 is rotated by the bucket cylinder 10 and the like, so that the earth and sand Excavation work can be performed.

  Thus, according to the present embodiment, the hook holding means 30 that holds the hanging load hook 24 in the storage position shown in FIG. 3 is connected to the holding pin 31 that is movably inserted into the pin insertion hole 15C of the left link plate 15. The pin support member 34 that supports the distal end side of the holding pin 31, a lock state that is integrally attached to the pin support member 34 and holds the hanging load hook 24 in the retracted position, and the holding pin 31 is held by the hanging load hook 24. It is comprised by the pin lock mechanism 37 switched to the unlocking state made to detach | leave from the collar part 29 of this.

  In this case, since the pin lock mechanism 37 is attached to the pin support member 34, the pin lock mechanism 37 is not detached from the holding pin 31 and lost, and the pin locking mechanism 37 pivots the holding pin 31. By locking in the direction, the hanging load hook 24 can be reliably held in the retracted position. As a result, for example, during excavation work using the bucket 7, the hanging load hook 24 does not inadvertently jump out of the hook storage space 21 of the bucket link 14 with the hook, and the breakage of the hanging load hook 24 can be prevented. The workability of excavation work can be improved.

  Further, the holding pin 31 includes a small diameter portion 31A that is movably inserted into the pin insertion hole 15C of the left link plate 15, and a large diameter portion 31B having an outer diameter φD that is larger than the hole diameter φd of the pin insertion hole 15C. Therefore, as shown in FIG. 6, when the holding pin 31 is removed from the flange portion 29 of the hanging hook 24, the holding pin 31 is detached from the left link plate 15 through the pin insertion hole 15 </ b> C of the left link plate 15. There is nothing. As a result, it is possible to reliably prevent the holding pin 31 from being lost, and the holding pin 31 can reliably hold the hanging hook 24 in the storage position.

  Further, the pin lock mechanism 37 is engaged with a base member 38 attached to the pin support member 34 and a lock position (position in FIG. 8) which is supported by the base member 38 and engages with the engagement groove 31C of the holding pin 31. A stopper 40 that moves between the unlocking position (the position shown in FIG. 9) that separates from the mating groove portion 31C and a compression spring 41 that constantly biases the stopper 40 toward the locking position.

  As a result, the engagement end portion 40 </ b> D of the stopper 40 can be engaged with the engagement groove portion 31 </ b> C of the holding pin 31 while being pressed by the compression spring 41. As a result, it is possible to prevent the engagement end portion 40D of the stopper 40 from being inadvertently detached from the engagement groove portion 31C of the holding pin 31 due to vibration during excavation work using the bucket 7, for example. The pin 31 can reliably hold the hanging load hook 24 in the retracted position.

  Further, since the lock release lever 42 is provided on the rear end side of the stopper 40, the stopper 40 pressed against the lock position by the compression spring 41 can be operated against the compression spring 41 by operating the lock release lever 42. Thus, it can be easily moved to the unlocking position, and workability when the hanging load hook 24 is taken out from the storage position to the working position can be improved.

  In the above-described embodiment, the case where the pin insertion hole 15C through which the holding pin 31 is inserted is provided in the left link plate 15 and the pin lock mechanism 37 is provided in the right link plate 18 is illustrated. However, the present invention is not limited to this, and for example, a pin insertion hole may be provided in the right link plate 18 and a pin lock mechanism 37 may be provided in the left link plate 15.

It is a front view which shows the hydraulic shovel provided with the bucket link with a hook by embodiment of this invention. It is the bottom view which looked at the bucket link with a hook from the arrow II-II direction in FIG. 1 in the state which hold | maintained the hanging load hook in the storage position. It is sectional drawing which looked at the hanging load hook etc. which were hold | maintained in the storing position from the arrow III-III direction in FIG. It is sectional drawing similar to FIG. 3 which shows the state which moved the hanging hook to the operation position. FIG. 3 is a cross-sectional view of the hanging load hook, the holding pin, the pin lock mechanism, and the like in FIG. It is sectional drawing similar to FIG. 5 which shows the state which removed the holding pin from the collar part of the hanging load hook. It is a disassembled perspective view which shows a pin support member and a pin lock mechanism. FIG. 6 is an enlarged cross-sectional view showing enlarged main parts such as a holding pin, a base member, a stopper, and a compression spring in FIG. 5. It is an expanded sectional view similar to FIG. 8 which shows the state which moved the stopper to the lock release position. It is an expanded sectional view similar to FIG. 8 which shows the state which the stopper returned to the locked position with the compression spring. It is an expanded sectional view similar to FIG. 8 which shows the state which a stopper is pressed by the holding pin and moves from a lock position.

Explanation of symbols

7 Bucket 10 Bucket cylinder 10A Rod 14 Bucket link with hook 15 Left link plate 16 Cylinder side boss (first boss)
17 Bucket side boss (second boss)
18 Right link plate 19 Cylinder side boss (first boss)
20 Bucket side boss (second boss)
DESCRIPTION OF SYMBOLS 21 Hook storage space 22 1st connection shaft 23 2nd connection shaft 24 Suspension load hook 29 Hook 30 Hook holding means 31 Holding pin 31A Small diameter part 31B Large diameter part 31C Engaging groove part (engaging part)
34 Pin support member 37 Pin lock mechanism 38 Base member 40 Stopper 40D Engagement end 41 Compression spring (biasing means)
42 Unlocking lever

Claims (4)

Left and right link plates that are disposed with a spacing in the left and right directions, the first boss portion is provided on one end side in the length direction, and the second boss portion is provided on the other end side, A first connecting shaft that connects between the first boss portion and the bucket cylinder provided on one end side in the length direction of the link plate; and provided on the other end side in the length direction of each link plate. Further, the second connecting shaft that connects the second boss portion and the bucket, and the second connecting shaft that is positioned between the second boss portions provided on each of the link plates is supported by the second connecting shaft. A hook which is movable between a storage position disposed in the hook storage space formed between the link plates and a work position taken out of the hook storage space; and the hook is stored in the storage position. In a bucket link with a hook comprising hook holding means for holding
The hook holding means is movably inserted into one of the link plates, and a holding pin inserted into a hook portion of the hook when the hook is in the storage position;
A pin support member that is provided in the hook storage space and supports the tip side of the holding pin;
A locked state that is attached to the pin support member and prohibits movement of the holding pin in the axial direction by engaging with the holding pin, and an unlocked state that allows movement of the holding pin by detaching from the holding pin A bucket link with a hook, characterized by comprising a pin lock mechanism that can be switched between.   The holding pin has a small-diameter portion that is movably inserted into a pin insertion hole provided in one of the link plates, and has a larger diameter than the pin insertion hole and is disposed in the hook storage space. The bucket link with a hook according to claim 1, wherein the bucket link is configured by a large-diameter portion, and an engagement portion is provided on an outer peripheral surface of the large-diameter portion to engage and disengage the pin lock mechanism.   The pin lock mechanism includes a base member attached to the pin support member, a lock position that is supported by the base member and engages with an engagement portion provided on the holding pin, and a lock release position that is disengaged from the engagement portion. And a biasing means provided between the stopper and the base member and constantly biasing the stopper toward the lock position. Bucket link with hook.   The bucket link with a hook according to claim 3, wherein the stopper is provided with a lock release lever for moving the stopper from the lock position to the lock release position against the biasing means.

Images