JP2005145689A - Weeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weeding device which allows weeding without traveling into a river bed, is small and easily operated so as to allow weeding even from the above part of a narrow bank, has a simple structure, and allows weeding while minimizing occurrence of murky water with little drilling of earth and sand of the river bed by drawing out water plants from thier roots. <P>SOLUTION: The weeding device 1 comprises a slider 3 suspended on a traction body 2, a body frame 4 connected with the slider 3 liftably in a predetermined stroke range, a pair of grabs 5 of which base ends 51 are supported on both sides of the lower part of the body frame 4, a pair of locking means 6 arranged near the center inside the body frame 4, an interlocking means 7 for interlocking the pair of grabs 5 with the slider 3, and an attaching/detaching means 8 connected to the slider 3 vertically slidably. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is a weeding device capable of opening and closing a fork-like grab while hanging from a crane or the like often used as a general-purpose machine via a wire rope, grabbing, extracting, and removing weeds and the like About.

  Conventionally, the work of removing aquatic plants represented by dredging and the like from a river bed is carried out by placing a construction machine into the river bed regardless of the size of the river. For this reason, it has been pointed out that river environments including ecosystems such as aquatic plants are severely devastated. Alternatively, an existing device called a clamshell is well known. If the device is suspended by a crane installed outside the riverbed, the above work can be performed without putting construction machinery into the riverbed, but a large machine that uses two or more wires is required to operate the clamshell. Therefore, a wide dike or a wide work yard is indispensable near the riverbed.

Moreover, since weeding with the construction machine described above involves excavation of the riverbed, the sediment on the riverbed is excavated with aquatic plants. For this reason, there is no small influence on the river environment, and there is a problem that turbid water is unnecessarily generated during the weeding process. In particular, in small rivers with a river width of around 10 m, the burden on the environment is excessive, and the weeding work is large as described above, so river maintenance costs or management costs may increase unnecessarily. It is regarded as a problem. Conventional techniques are disclosed in the following patent documents.
Japanese Patent Laid-Open No. 7-10455 Japanese Patent Laid-Open No. 10-139353 JP 2000-314238 A JP 2002-186314 A JP 2003-184123 A

  In recent years, eutrophication of river water quality has progressed due to drainage from households and fields, and aquatic plants have become prosperous. In particular, in small rivers with a river width of about 10 m, it is conceivable that if the abundance of aquatic plants is left unattended, the water flow of the rivers is hindered by aquatic plants, and there is concern about safety management against flood damage such as floods. On the other hand, the river law revised in 1997 included a mandatory provision that the natural environment of the river should be considered. However, with conventional technologies and methods, it is necessary to put construction machinery on the riverbed, or because it requires a wide work yard for installing large cranes, while taking into consideration the natural environment. Weeding cannot be carried out, and weeding is inevitable.

  Therefore, the present invention has been made as a result of sharp research aimed at removing roots of aquatic plants while suppressing the influence on the river environment as much as possible. Its purpose is to be able to weed without entering the riverbed, to be able to weed even from a narrow embankment (approximately 3m wide), easy to operate, simple in structure, and aquatic plants It is an object of the present invention to provide a weeding apparatus that can perform weeding while minimizing the generation of muddy water without digging almost all of the sediment on the riverbed by pulling out the roots from the roots.

  The weeding device according to the present invention includes a slider supported by a checker, a main body frame in which the slider is connected to be movable up and down within a stroke range having an upper limit and a lower limit, and a swivel on both lower sides of the main body frame. A pair of grabs supported and extending a fork having a tip, a latching means for latching the slider positioned in the middle of the stroke, or a posture separating from the slider, and the slider ascends In accordance with the stroke, the pair of grabs are pivoted in a direction in which the tips of the respective forks are close to each other, and the latching means is connected to the slider and moves upward of the latching means. And an attaching / detaching means for engaging the slider and separating the engaging means from the slider by approaching the engaging means. Weeding apparatus according to.

  Furthermore, in the weeding apparatus according to the present invention, the attaching / detaching means is connected to the slider via an elastic body that can be expanded and contracted in the vertical direction, and the latching means is self-weighted in a process in which the slider is lifted together with the attaching / detaching means. When the slider reaches the lower limit of the stroke, the attaching / detaching means separates the engaging means from the slider, and the body frame is attached to the slider together with the slider. Unlocking means for releasing the locking means in a stroke in which the slider rises beyond the height of the latching means, and includes a locking means for allowing the slider to descend and restricting the attaching / detaching means to rise. It comprises a part.

  Further, in the weeding apparatus according to the present invention, the interlocking means is constructed such that the interlocking means is horizontally connected to the main body frame and supports the pair of grabs below the both ends, and the lower ends are pin-joined to the pair of grabs. A pair of connecting rods having upper ends projecting upward from the lower frame, a pair of swing arms having one end and the other end and pin-joined in the longitudinal direction to the upper end of the connecting rod, and the pair of swing arms A pair of flexible checkers that respectively connect the other end of each of the sliders to the lower end of the slider, and each end of the pair of swing arms passes through the pair of flexible checkers in a process of ascending the slider. Then, by being pulled upward of the lower frame, the pair of swing arms pivots on the respective upper ends of the pair of connecting rods, and the pair of swing arms respectively Characterized by upright end while each contact on the lower frame.

  The weeding device according to the present invention includes, for example, a pair of grabs in which a slider supported by a crane or the like via a checker is connected to a main body frame so as to be movable up and down within a predetermined stroke range, and a fork having a tip is extended. Since each of the pair of grabs is swung in a direction in which the tips of the respective forks are close to each other, the forks of the pair of grabs are engaged with each other. When the pair of grabs are turned in the opposite directions, the tips of the forks are separated from each other. By hooking aquatic plants on a pair of grabs while repeating the above operations, the aquatic plants can be quickly and easily removed from the river bed.

  Also, by installing cranes, etc. on land such as dykes, and using such cranes, rivers and wetlands where people and construction machinery do not directly approach can be found in aquatic plants and rivers It can be easily removed by grabbing and collecting the collected garbage. In addition, as described above, the aquatic plants are hooked on the forks of the pair of grabs, so that the aquatic plants are hardly grasped together with the earth and sand, and the river environment such as the river bed is not greatly disturbed. Moreover, because weeds can be separated well from soil and sand and water at the same time as weeding, almost no unnecessary soil and water are lifted from the riverbed together with aquatic plants, so disposal of aquatic plants after weeding from the riverbed The amount can be minimized. Therefore, weeding can be performed at a lower cost than in the past.

  Furthermore, since the weeding apparatus according to the present invention can be mounted on a small crane or the like, it is ideal for work on a narrow (about 3 m) embankment and is extra for the construction of an approach path into the river and a work yard. There is no need to spend extra money. Further, compared to the conventional configuration in which the bucket rotates the sheave with two wire ropes or the like, and the pair of grabs rotate (open / close movement) according to the rotation of the sheave, the weeding device according to the present invention For example, since the weeding device can be suspended and a pair of grabs can be swung with only one checker, the above operations can be easily performed by a general-purpose crane that only suspends one wire rope from the tip of the boom. Can be done.

  The operation of the grab described above is based on the following principle. That is, the weeding device is used by being lifted by a crane or the like. When the slider of the device is first positioned near the height of the latching means, and the slider is lifted by a checker connected to a crane or the like, the attachment / detachment means connected to the slider via the elastic body rises together with the slider. . In this process, the latching means is configured to latch the slider by its own weight, and the latching means latches the slider that has been raised to a height in the middle of the stroke.

  Further, when the slider is lifted by the check body, the main body frame (the entire apparatus) is lifted from the ground or the like together with the hooking means hooked on the slider while the slider is stopped at a height in the middle of the stroke. . On the other hand, the interlocking means turns the pair of grabs in the direction in which the tips of the respective forks are close to each other in accordance with the stroke of the slider ascending as described above. Therefore, as long as the slider stops at a height in the middle of the stroke, the pair of grabs are not applied with a force for turning them. For this reason, a pair of grabs hold | maintain the attitude | position which suspended the front-end | tip of each fork with dead weight.

  Subsequently, the weeding device is lowered to the river bed by the crane illustrated above, and the tip of each fork of the pair of grabs is pierced into the river bed as it is. If the check body is further loosened or the boom such as a crane is lowered, only the slider descends and reaches the lower limit of the stroke. In this process, the locking means provided on the main body frame allows the attaching / detaching means to descend along with the slider, so that the attaching / detaching means connected to the slider comes close to the latching means from above. At this time, the attaching / detaching means pushes the engaging means downward, so that the engaging means is separated from the slider. Therefore, the slider can be freely raised from the lower limit to the upper limit of the stroke without being restricted by the latching means.

  If the slider is raised again to the upper limit of the stroke by a crane or the like, the interlocking means will operate according to this stroke, and the pair of grabs will turn the tips of their forks close to each other, and the respective forks will mesh with each other. Become. On the other hand, since the slider is provided with an unlocking portion for releasing the locking means in the process of rising from the position close to the lower limit of the stroke beyond the height of the latching means, until the slider reaches the upper limit of the stroke In this case, the latching means can rise following the slider.

  In this case, in the process of ascending the slider, the flexible checker is pulled by the slider, and the swing arm swings around the upper end of the connecting rod, so that the swing arm stands up with one end contacting the lower frame. If configured, a pair of grabs meshed with each other forks receive the resistance of their own weight or aquatic plants firmly rooted in the riverbed, thereby causing the pair of grabs to separate each fork from each other Even if a strong reaction force is applied, such a reaction force is canceled as a force pressing one end of each swing arm against the lower frame. Therefore, the pair of grabs will not return to the posture of hanging the tip of each fork.

  Furthermore, according to the weeding apparatus according to the present invention, by forcibly turning the pair of grabs while piercing the riverbed, the aquatic plants are caught from the riverbed while hooking the roots of the aquatic plants on the respective forks of the pair of grabs. You can hold aquatic plants inside a pair of grabs that are pulled out and rooted together. And if the slider which reached the upper limit of a stroke is further lifted with a crane etc., a main body frame (the whole said apparatus) will be elevated from a river bed with the slider. In this process, it is still pulled by hitting the upper limit of the stroke. Therefore, even if the pair of grabs meshing with each other does not rotate in the direction in which the forks are separated from each other even if they are subjected to their own weight or the load of aquatic plants, the pair of grabs are at the tip of each fork. Will not return to the position of hanging.

  Subsequently, the weeding device is moved to a position just above the unloading site such as a truck bed by a crane or the like, and lowered again to receive the weeding device at the unloading site. If the checker is further loosened or the boom such as a crane is lowered, only the slider continues to descend. At this time, if the slider is lowered to the vicinity of the height of the latching means without lowering the slider to the lower limit of the stroke, the latching means latches the slider. Therefore, when the slider is lifted again by the check body, as described above, the main body frame (the entire apparatus) is lifted from the unloading place together with the latching means latched on the slider.

  On the other hand, as long as the slider stays at the middle of the stroke, the pair of grabs are not subjected to the force of turning them, so the pair of grabs receive the load of grass in addition to their own weight, The position of the fork is drooping. For this reason, aquatic plants slide down from the pair of grabs and are surely lowered to the unloading site.

  A weeding device according to an embodiment of the present invention will be described with reference to the drawings. 1 to 3 show a series of operations of the weeding device 1. 4 is a perspective view of a main part corresponding to FIG. 1, and FIG. In the following, in addition to known devices such as cranes, booms, trucks, etc., illustrations and explanations of obvious machine elements are omitted.

  As shown in FIG. 1, the weeding device 1 according to the first embodiment includes a slider 3 supported by being suspended by a checker 2 and the like, and a main body frame in which the slider 3 is connected to be movable up and down within a predetermined stroke range. 4, a pair of grabs 5 having base ends 51 supported on both lower sides of the main body frame 4, a pair of hooking means 6 disposed near the center inside the main body frame 4, and a pair of sliders 3. The main component is an interlocking means 7 for interlocking the grab 5 and an attaching / detaching means 8 slidably connected to the slider 3 in the vertical direction.

  First, the outline of the above-described constituent members will be described with reference to FIGS. 1 to 5, and the details of each will be described along the subsequent operation description.

  That is, as the check body 2, for example, a wire rope or a chain suspended from a boom of a crane can be applied. The slider 3 is a steel rod body in which a pair of hooked portions 31 protrude from both sides of the lower end, and a lock release portion 32 is raised on the front side between the pair of hooked portions 31. The main body frame 4 is a frame body or a housing. The above stroke range corresponds to the length represented by the dimension line S in the drawing. Hereinafter, this is simply referred to as “stroke S”. The upper limit of the stroke S means a limit at which the slider 3 can be raised, and the lower limit of the stroke S means a limit at which the slider 3 can be lowered. The “height” of the slider is based on the position of the hooked portion 31.

  The pair of grabs 5 are mainly composed of a plurality of forks 52 each having a distal end 53 that can be swung with the respective base ends 51 as fulcrums. In the drawing, the fork 52 is shown as one pair of left and right as a pair of grabs 5, but the actual grab 5 has a shape elongated in the depth direction with respect to the drawing, and extends along this longitudinal direction. A plurality of forks 52 are arranged at equal intervals. It is preferable to apply a detachable bolt or the like to fix the individual forks 52 so that the distance can be adjusted appropriately. It is preferable that the front end 53 of the fork 52 has a sharp shape that extends from the base end 51 by a predetermined length and easily pierces the river bed.

  The pair of latching means 6 are attached to the main body frame 4 in the middle of the stroke S in which the slider 3 moves up and down, that is, at an appropriate position corresponding to between the upper limit and the lower limit of the stroke S. The latching means 6 shown in FIGS. 1 and 4 is in a state where the slider 3 is latched in an inclined posture. The latching means 6 shown in FIGS. 2 and 5 is in an upright posture and is separated from the slider 3.

  As shown in FIGS. 2 and 3, the interlocking means 7 moves the pair of grabs 5 in the direction in which the tips 53 of the respective forks 52 come close to each other in accordance with the stroke in which the slider 3 rises with respect to the main body frame 4. It is intended to turn. This turning direction is indicated by an arrow C in the figure.

  As shown in FIGS. 4 and 5, the attaching / detaching means 8 is a steel cylinder having a rectangular cross-sectional shape having an opening 81 through which the slider 3 is inserted. The attachment / detachment means 8 is a member that plays a role of changing the hooking means 6 to the above-described tilted posture or the upright posture in a timely manner by cooperating with a lock means described later.

  Next, the operation of the weeding device 1 will be described. The English letters attached to the beginning of the following sentences are indicators for classifying the operation steps related to the weeding device 1.

  A: A truck may be used to transport the weeding device 1 to the river bed. For example, when the weeding device 1 is placed on the truck bed, the pair of grabs 5 are directed toward the inside of the main body frame 4 as shown in FIG. 6 so that the tip 53 of the fork 52 does not hit the truck bed. It is desirable to fold and tilt each fork 52 substantially horizontally.

  Such an operation of the grab 5 can be performed independently of the lifting / lowering operation of the slider 3 before using the weeding device 1. Specifically, the main body frame 4 hangs a pair of arm portions 42 downward from both ends of the lower frame 41. As the lower frame 41, a horizontally extending frame or guide rail can be applied. The base ends 51 of the pair of forks 52 are respectively pin-joined near the lower ends of the pair of arm portions 42. Further, each fork 52 has a lower end 91 of the connecting rod 9 pin-connected at a position slightly away from the base end 51. The upper ends 92 of the individual connecting rods 9 extend to the upper side of the lower frame 41 and are respectively pin-joined in the middle of the individual swing arms 10 in the longitudinal direction.

  The pair of swing arms 10 shown in FIG. 6 has a substantially fan-shaped rolling contact portion 101 formed at one end thereof directed to the outside of the main body frame 4, and a thin wire rope or chain or the like at each other end 102. One end of each flexible support 103 is connected. The other ends of the pair of flexible checkers 103 are bundled together and connected to the lower end of the slider 3. On the other hand, one sheave 104 is attached to each upper part on both sides of the main body frame 4, and two sheaves 105 are attached to the vicinity of the center of the lower frame 41 at intervals. The individual flexible checkers 103 are sequentially wound around the sheaves 104 and 105 to meander the inside of the main body frame 4 and connect the other end 102 of each swing arm 10 and the slider 3 to each other. The connecting rod 9, the swing arm 10, and the flexible anchor 103 described above constitute the interlocking means 7 described above.

  The slider 3 falls to the lower limit of the stroke S by its own weight unless receiving any external force. In this state, the pair of flexible checkers 103 are loosened moderately in the state where the slider 3 is kept on standby or at the position where the slider 3 is slightly raised from the lower limit of the stroke S as shown in the figure. The swing arm 10 can be freely changed in posture without being pulled by the flexible checker 103. Accordingly, the pair of grabs 5 can be folded as described above. Furthermore, since each swing arm 10 can freely pivot about the upper end 92 of the connecting rod 9, each swing arm 10 is inclined downward toward the other end 102 side where the center of gravity exists, and the individual swing arm 10. Is directly received by the lower frame 41.

  It is necessary to securely stop the slider 3 at the lower limit or upper limit height of the stroke S so that the slider 3 does not escape beyond the range of the stroke S. For example, a stopper that is not shown in the figure may be fixed to the slider 3 so that when the slider 3 reaches the upper limit or the lower limit, the stopper hits an appropriate position of the main body frame 4. Although not shown, a small link that can be swiveled with the other end 102 as a fulcrum is attached to the other end 102 of each of the pair of swing arms 10, and one end of the flexible stamper 103 is connected to the other end 102 via the small link. May be connected.

  B: The check body 2 is hooked on the upper end of the slider 3. In this case, the hook 3 may be preliminarily drilled in the slider 3, and the check body 2 may be hooked on the hook hook 35. And the slider 3 can be raised / lowered by raising the boom of a crane or winding up the check body 2 with a crane. As an initial setting of the weeding device 1, as shown in FIG. 1, the height of the slider 3 is adjusted so that the attaching / detaching means 8 is positioned slightly above the pair of hooking means 6. The slider 3 shown in the figure reaches a height of 15 to 30 cm from the lower limit of the stroke S. This height is hereinafter referred to as “hanging height”.

  As shown in FIG. 4, pins 33 are respectively provided on the front surfaces of the slider 3 and the attaching / detaching means 8. An elastic body 34 such as a long rubber or a coil spring is stretched between these two pins 33, and the slider 3 and the attaching / detaching means 8 are connected via the elastic body 34. Therefore, when the slider 3 located near the above-described hooking height is slightly raised and lowered, the attaching / detaching means 8 is also raised and lowered together with the slider 3. On the other hand, the support 11 represented by phantom lines in FIG. 1 is omitted in FIG. The support body 11 is a frame body through which the slider 3 is inserted, and is fixed to the main body frame 4. The attachment / detachment means 8 has the slider 3 inserted in the vicinity of the center in the opening 81, and the support 11 is inserted in the space on both sides of the slider 3 in the opening 81.

  Further, the support 11 has a space for arranging the pair of latching means 6 on the inside thereof, and supports the pair of latching means 6 via the pair of support shafts 61. The pair of latching means 6 can freely turn around the support shaft 61, but a balancer (weight) that is not shown in the figure is placed at an appropriate position so that if it receives no external force, it will be in the inclined posture shown in its own weight. Installed. Each of the latching means 6 taking an inclined posture brings the latching portion 62 at the lower end close to the side surface of the slider 3 and moves the upper end 63 away from the slider 3.

  C: When the slider 3 is further lifted, the pair of hooked portions 31 of the slider 3 raised to a height in the middle of the stroke S are hooked on the hooking portions 62 of the pair of hooking means 6. The latching portions 62 of the pair of latching means 6 are about to be pushed up by the reaction force that lifts the slider 3, but the latching portions 62 of the individual latching means 6 latch the latched portion 31. At the same time, since it abuts against the side surface of the slider 3, the individual latching means 6 keeps still in an inclined posture. At this time, the pair of flexible checkers 103 are pulled slightly by the slider 3 and slightly tensioned, but the other ends 102 of the pair of swing arms 10 are still received by the lower frame 41. .

  D: Lift the slider 3 higher. Regardless of this height, since the slider 3 is already hooked to the pair of hooking means 6, the pair of hooks hooked to the slider 3 while the slider 3 is stopped at a height in the middle of the stroke S. The main body frame 4 and the pair of grabs 5 (the entire weeding device 1) together with the means 6 are lifted from the truck bed.

  In the process of raising the weeding device 1, the slider 3 does not rise from the height in the middle of the stroke S, so that the pair of flexible checkers 103 is not pulled beyond the step C by the slider 3. Therefore, since no external force is applied to the pair of grabs 5, the pair of grabs 5 folded in the above step A receive their own weight at the same time as the weeding device 1 lifts from the truck bed, and each grab 5 receives its own weight. The fork 52 pivots in a direction in which the tip 53 of the fork 52 hangs down. With this operation, the entire connecting rod 9 is pulled downward, and accordingly, the rolling contact portions 101 of the pair of swing arms 10 that have been lifted from the lower frame 41 of the main body frame 4 are lowered to swing. The entire arm 10 is lowered substantially horizontally. Such a change in the posture of the swing arm 10 is apparent when FIG. 1 and FIG. 6 are compared.

  In a state where the swing arm 10 is lowered substantially horizontally and is received by the lower frame 41, the connecting rod 9 having the upper end 92 pin-joined to the swing arm 10 cannot be lowered from the height shown in FIG. Therefore, the distance between the tips 53 of the pair of forks 52 is limited to the illustrated width, and does not further increase. Although not shown in the drawings, if a jack that can be expanded and contracted in the vertical direction is attached to the lower frame 41, and each swing arm 10 is received by this jack, each jack can be expanded and contracted. The height at which the swing arm 10 is received by the main body frame 4 can be adjusted. Thereby, the limit of the width of the above-mentioned tip 53 can be increased or decreased as desired.

  E: The crane is operated to lower the weeding device 1 to the river bed, and the tip 53 of each fork 52 of the pair of grabs 5 is pierced into the river bed as it is. As the reaction force, a force is generated to push and spread the pair of forks 52. However, since the limit of the width is defined as described above, the pair of forks 52 has the distal ends 53 along the respective curves. Will gradually pierce the riverbed. In this process, each of the pair of forks 52 has an inwardly curved shape, and therefore, an inward reaction force is applied to the pair of forks 52 as each tip 53 is inserted into the river bed and deeply penetrates. For this reason, a pair of forks 5 will rotate to some extent in the direction which makes each front-end | tip 53 adjoin.

  F: When the check body 2 is further loosened or the boom of the crane is lowered, the pair of forks 52 pierce the river bed to a certain depth, and the weeding device 1 is received by the river bed. Only the slider 3 is further lowered. In this process, the pair of hooked portions 31 of the slider 3 are detached downward from the hooking portions 62 of the pair of hooking means 6, respectively. Immediately after that, the slider 3 becomes the state of FIG. 4 again and finally reaches the lower limit of the stroke S.

  On the other hand, the attaching / detaching means 8 once descends together with the slider 3, while the slider 3 reaches the lower limit of the stroke S, whereas the attaching / detaching means 8 does not move until the slider 3 reaches the lower limit of the stroke S. Stop in the state shown in FIG. On the other hand, since the elastic body 34 that connects the slider 3 and the attaching / detaching means 8 can expand and contract appropriately, the attaching / detaching means 8 is allowed to move up and down relative to the slider 3. Details are as follows.

  That is, each of the latching means 6 forms an inclined surface 65 that goes downward as it moves away from the slider 3 with the ridgeline 64 of the upper end 63 as a boundary. 4 and FIG. 5, when the attaching / detaching means 8 is lowered, the lower end 84 of the attaching / detaching means 8 comes into contact with the inclined surfaces 65 of the individual latching means 6 taking the inclined posture, and the inclined surfaces. When 65 is pushed downward by the lower end 84, the upper end 63 of the latching means 6 is immersed in the opening 81 of the attaching / detaching means 8 while slidingly contacting the lower end 84 of the attaching / detaching means 8. In this process, each latch means 6 turns to the upright posture shown in FIG. 5 by receiving a rotational force in the direction indicated by the arrow I in FIG. The pair of latching means 6 are held in an upright posture while being inserted into the opening 81. Further, as shown in FIG. 7, the inner surfaces 82 on both sides of the opening 81 are inclined so as to approach each other toward the upper end 83, so that a pair of latching means 6 taking an upright position causes the opening 81 to move to the upper end 83. Cannot pass to the side. Therefore, the attaching / detaching means 8 is stationary while being close to the pair of hooking means 6, and the elastic body 34 is extended as much as only the slider 3 is lowered.

  G: At the same time as or immediately before the slider 3 reaches the lower limit of the stroke S in the step F, the attaching / detaching means 8 is locked by the locking means 12 shown in FIGS. The principle of this lock is as follows.

  That is, the locking means 12 is a claw piece attached to the front surface of the main body frame 4 via a support shaft 121 shown in FIG. 7 and a bracket not shown in the drawing. In other drawings in which the weeding device 1 is viewed from the front, the locking means 12 overlaps with the slider 3 and is therefore omitted. The locking means 12 as a whole is formed by integrating two long steel materials extending in the vertical direction. The claw portions 122 for engaging the upper end 83 of the attaching / detaching means 8 protrude from the upper ends of the locking means 12, respectively. A projecting piece 123 is formed between the twelve support shafts 121 and the claw portion 122 so as to face the unlocking portion 32 of the slider 3. The locking means 12 is connected to a proper position of the main body frame 4 via a return spring not shown in the drawing. The return spring pushes the two claw parts 122 in a direction approaching the attaching / detaching means 8 and urges the entire locking means 12 to be in an upright posture. This biasing direction is indicated by an arrow R in the figure.

  Since the upper end of each claw portion 122 is an inclined surface that gradually protrudes toward the attachment / detachment means 8 toward the lower side, the lower end 84 of the attachment / detachment means 8 is a nail while the attachment / detachment means 8 is lowered along with the slider 3. When it comes into contact with the portion 122, the lower end 84 of the attaching / detaching means 8 turns in the direction indicated by the arrow F in the figure while slidingly contacting the claw portion 122. Thereby, the nail | claw part 122 retreats to the front side, and it is accept | permitted that the attachment / detachment means 8 falls below rather than each nail | claw part 122. FIG. When the upper end 83 of the attaching / detaching means 8 becomes lower than the individual claw portions 122, the lock means 12 is returned to the upright posture by the return spring, and the claw portion 122 hooks the upper end 83 of the attaching / detaching means 8. Stop. As a result, the lifting of the attaching / detaching means 8 is restricted.

  Since the attaching / detaching means 8 is only connected to the slider 3 via the coil spring 34, the attaching / detaching means 8 may be pushed back upward when it hits the claw portion 122. In order to prevent this, as shown in FIG. 5, the pin 36 protrudes from the front surface of the slider 3, and when the slider 3 is lowered to the lower limit of the stroke S or in the vicinity thereof, the pin 36 moves the upper end 83 of the attaching / detaching means 8. The attaching / detaching means 8 that pushes down and hits the claw portion 122 may be forcibly lowered.

  H: When the slider 3 is lifted again by the crane, the slider 3 rises again to the above-described hooking height. In this process, the attaching / detaching means 8 locked in the G step continues to be prevented from rising by the locking means 12 as it is. Therefore, as shown in FIG. The latch means 6 also keeps an upright posture. For this reason, when the slider 3 reaches the “holding height”, the pair of hooked portions 31 of the slider 3 enters between the pair of hooking means 6.

  I: When the slider 3 is further raised, immediately after the hooked portion 31 enters between the pair of hooking means 6, the unlocking portion 32 of the slider 3 hits the protruding piece 123 of the locking means 12, and the slider 3 The lock release portion 32 pushes the lock means 12 in the direction indicated by the arrow F in the figure while slidingly contacting the protruding piece 123 of the lock means 12.

  As a result, the claw portion 122 is retracted to the front side again and the lock is released, so that the attaching / detaching means 8 is lifted by the elastic force of the elastic body 34 to be shortened, and the slider as shown in FIG. Follow 3 Then, the pair of hooking means 6 released from the attaching / detaching means 8 returns to the inclined posture by its own weight, but in the step H, the hooked portion 31 has already entered between the pair of hooking means 6. Therefore, the hooked portion 31 is not hooked by the hooking means 6. Therefore, the slider 3 can be freely raised toward the upper limit of the stroke S without being hooked by the pair of hooking means 6.

  J: As shown in FIG. 3, the pair of grabs 5 swivel the tips 53 of the respective forks 52 toward each other in accordance with the stroke in which the slider 3 rises beyond the above-described latching height. 52 will mesh with each other.

  Specifically, when the slider 3 rises beyond the latching height, the pair of flexible checkers 103 are strongly pulled by the slider 3 and are strained. Then, the other end 102 of each swing arm 10 is gradually lifted by the tension generated in each flexible checker 103. Thereby, each swing arm 10 turns with the rolling contact portion 101 as a fulcrum while the rolling contact portion 101 is in rolling contact with the lower frame 41. As the pair of swing arms 10 are turned, the positions of the upper ends 92 of the pair of connecting rods 9 are displaced upward, so that the pair of grabs 5 are turned in directions in which the tips 53 of the forks 52 are close to each other. become.

  As described above, by forcibly turning the pair of grabs 5 while piercing the riverbed, the aquatic plants can be pulled out of the riverbed while hooking the roots of the aquatic plants on the respective forks 52 of the pair of grabs 5. it can. Further, aquatic plants can be held inside the pair of grabs 5 in a posture in which the forks 52 are engaged with each other.

  K: By the time the slider 3 reaches the upper limit of the stroke S, the swing arm 10 stands at an angle of 60 ° to 90 ° with respect to the lower frame 41 as shown in FIG. At this time, each swing arm 10 strongly presses the rolling contact portion 101 and the protruding corner portion (heel) 106 slightly protruding toward the slider 3 against the lower frame 41. In this state, the lower end 91, the upper end 92, and the protruding corner portion 106 of each connecting rod 9 are aligned with each other. Alternatively, the protruding corner portion 106 is positioned closer to the slider 3 than the upper end 92 of the connecting rod 9.

  L: When the slider 3 reaches the upper limit of the stroke S, if the slider 3 is further lifted by a crane, the entire weeding device 1 together with the slider 3 is elevated from the river bed. In this process, the pair of grabs 5 in which the forks 52 are engaged with each other receives the resistance of aquatic plants firmly rooted in the river bed. As a result, the pair of grabs 5 receive a strong reaction force in a direction in which the respective forks 52 are separated from each other, but the lower end 91, the upper end 92, and the protruding corner portion 106 of each connecting rod 9 have already been described above. Therefore, the reaction force is almost canceled as a force for pressing the one end 101 of each swing arm 10 against the lower frame 41. Therefore, there is no fear that an excessive tension is applied to each flexible checker 103.

  M: The weeding device 1 is moved to a position just above the unloading site such as a truck bed by a crane and lowered again, so that the weeding device 1 is received by the unloading site. If the check body 2 is further loosened or the boom of the crane is lowered, only the slider 3 continues to descend, but the slider 3 is not lowered to the lower limit of the stroke S, and the attaching / detaching means 8 connected to the slider 3 is a pair. The slider 3 is lowered to a height that is close to the upper side of the latching means 6, that is, the above-described latching height. On the other hand, even if the flexible checker 103 is slackened again as the slider 3 descends, the swing arm 10 that has once stood up in step K can no longer be lowered horizontally by its own weight. Therefore, in order to return the swing arm 10 to the horizontal posture shown in FIG. 1, the other end 102 of the swing arm 10 is urged toward the slider 3 by a return spring not shown in the drawing.

  In the above step I, each latching means 6 has already returned to the tilted posture by its own weight, but the side surface of the latched portion 31 of the slider 3 is tilted along the tilt angle of the latching means 6. Therefore, when the side surface of the latching portion 31 comes into contact with the latching portion 62 of the latching means 6 taking the inclined posture in the process of lowering the slider 3, the side surface of the latching portion 31 moves the latching portion 62. It is possible to descend smoothly while retreating to the side.

  N: When the slider 3 is lifted by the check body 2 again, the entire weeding device 1 is lifted from the unloading place while the slider 3 is hooked on the pair of hooking means 6 as in the above step D. Become. Moreover, since no force is applied to the pair of grabs 5 to rotate them, the pair of grabs 5 receive the load of grass in addition to their own weight, and the postures of the tips 53 of the respective forks 52 are suspended. . For this reason, aquatic plants slide down from the pair of grabs 5 and reliably fall to the unloading place.

  If the above steps C to N are repeated, the aquatic plants on the riverbed can be quickly and easily removed by the weeding device 1.

  It should be noted that the present invention can be implemented in a mode in which various improvements, modifications, and variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. For example, in the above description, it is assumed that the members such as the grab 5, the latching means 6, the connecting rod 9, the swing arm 10, and the flexible checker 103 are all a pair of combinations. The members may be arranged in the depth direction of the drawing, and these may be combined in two or more pairs.

  The weeding device according to the present invention is mainly used to remove aquatic plants from the riverbed, but is not limited to this, for example, residential land, schoolyard, ground, landfill, bank, wilderness, or other It can also be used to remove weeds, garbage, gravel, etc. that thrive in vacant land, and also to remove garbage or driftwood drifting in artificial lakes such as reservoirs and dams.

The front view which shows the 1st step of operation | movement of the weeding apparatus of Example 1 which concerns on this invention. The front view which shows the 2nd step of operation | movement of the weeding apparatus of Example 1 which concerns on this invention. The front view which shows the 3rd step of operation | movement of the weeding apparatus of Example 1 which concerns on this invention. The perspective view which shows the operation example of the 1st step of the principal part of the weeding apparatus of Example 1 which concerns on this invention. The perspective view which shows the operation example of the 2nd step of the principal part of the weeding apparatus of Example 1 which concerns on this invention. The front view which shows the preparation stage of the weeding apparatus of Example 1 which concerns on this invention. (A) is a front view which shows the operation example of the 2nd step of the principal part of the weeding apparatus of Example 1 which concerns on this invention, (b) is the side view. (A) is a front view which shows the operation example of the 3rd step of the principal part of the weeding apparatus of Example 1 which concerns on this invention, (b) is the side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Weeding device 2: Check body 3: Slider 4: Body frame 5: Grab 6: Locking means 7: Interlocking means 8: Detachment means 9: Connecting rod 10: Swing arm 11: Support body 12: Locking means 31: Covered Hook 32: Unlocking part 34: Elastic body 41: Lower frame 52: Fork 53: Tip 103: Flexible checker S: Stroke

Claims (3)

A slider (3) supported by the checker (2);
A main body frame (4) in which the slider (3) is connected to be movable up and down within a range of a stroke (S) having an upper limit and a lower limit;
A pair of grabs (5) extending pivotally supported on both lower sides of the body frame (4) and extending a fork (52) having a tip (53);
A latching means (6) that takes a posture of latching the slider (3) located in the middle of the stroke (S) or a posture of separating from the slider (3);
Interlocking means (7) for rotating the pair of grabs (5) in a direction in which the tips (53) of the respective forks (52) are close to each other in accordance with a stroke of the slider (3) ascending;
The slider (3) is connected to the slider (3), and the slider (3) is hooked to the hooking means (6) by moving above the hooking means (6), and close to the hooking means (6). A weeding apparatus comprising an attaching / detaching means (8) for separating the hooking means (6) from the slider (3). The attachment / detachment means (8) is connected to the slider (3) via an elastic body (34) that can be expanded and contracted in the vertical direction.
When the slider (3) is lifted together with the attaching / detaching means (8), the latching means (6) is in a posture to latch the slider (3) by its own weight, and the slider (3) is moved to the stroke (S ) Reaches the lower limit, the attaching / detaching means (8) separates the latching means (6) from the slider (3),
The main body frame (4) includes locking means (12) that allows the attaching / detaching means (8) to move down together with the slider (3) and restricts the attaching / detaching means (8) from rising.
The said slider (3) is provided with the lock release part (32) which cancels | releases the said locking means (12) in the stroke | strength which goes over the height of the said latching means (6). The weeding apparatus according to 1. The interlocking means (7) spans horizontally on the main body frame (4) and a lower frame (41) for supporting the pair of grabs (5) below both ends;
A pair of connecting rods (9) that pin-join the lower end (91) to the pair of grabs (5) and project the upper end (92) upward of the lower frame (41);
A pair of swing arms (10) having one end (101) and the other end (102), each pin-joined in the longitudinal direction to the upper end (92) of the connecting rod (9);
A pair of flexible checkers (103) each connecting the other end (102) of the pair of swing arms (10) to the lower end of the slider (3),
In the process of ascending the slider (3), one end (101) of each of the pair of swing arms (10) is located above the lower frame (41) via the pair of flexible checkers (103). The pair of swing arms (10) pivots about the respective upper ends (92) of the pair of connecting rods (9), and the pair of swing arms (10) 3. The weeding device according to claim 1, wherein one end (101) of each of the two stands up while being in contact with the lower frame (41).

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