JP5737511B2 - Working machine - Google Patents

Description

  The present invention relates to a working machine having a telescopic hook used for work at a high place, for example, a work for cutting a high branch.

  For example, Patent Documents 1 and 2 show a working machine including a working unit at the tip of a collar extending from a rotation driving unit. In this working machine, the rotational force generated by the rotation driving unit is transmitted to the working unit through the collar unit, and operations such as mowing are performed in the working unit. The buttocks are telescopic.

Utility Model Registration No. 3123389 JP 2009-82028 A

  By the way, in the working machines as shown in Patent Documents 1 and 2, work in a higher place has been demanded. However, it is not possible to meet the demand by simply increasing the size of the collar. . This is because the buttocks become unstable, and as a result, the work becomes unstable.

  Then, an object of this invention is to provide the working machine which can perform the operation | work of a place higher than before stably.

  The present invention relates to a rotational drive unit that generates a rotational force, a working unit that receives a rotational force to perform an operation, a rotational drive unit and the working unit, and a rotational force generated by the rotational drive unit. And a manipulator including an operation unit for operating the operation of the working unit, wherein the eaves unit is connected to the rotation driving unit and the proximal end tube to which the operation unit is attached, and telescopic And a shaft body that extends in the base end tube and the tube body in a rotatable state and can be expanded and contracted together with the tube body, and the tube body is an outer tube on the rotation drive unit side. And an inner tube on the working unit side, the inner tube being insertable into the outer tube, a shaft body extending in the inner tube and a rod body extending in the proximal tube and the outer tube The rod body is insertable into the pipe body, and the rod body has three or more shafts in the outer tube. The bearing is rotatably provided in the outer tube so as to be non-rotatable and axially movable, and all the bearings are provided with coil springs having the same physical properties in the outer tube. When the inner tube is inserted into the outer tube and the rod member is contracted by being inserted into the pipe body, the inner tube compresses the coil spring evenly. It is characterized by that.

In addition, it is preferable that this invention employ | adopts the following structure arbitrarily or in combination.
(A) The rod is formed by processing a metal material that has been heat-treated in advance.
(B) The base end portion of the rod body is connected to the rotation driving portion by spline fitting, and the tip end portion of the pipe body is connected to the working portion by spline fitting.
(C) The outer tube and the inner tube are connected by a cylindrical holder, the proximal end of the cylindrical holder is fixed to the outer tube, and the distal end of the cylindrical holder is secured by tightening the knob bolt. It is fixed to the pipe and is in contact with the inner pipe via a resin sleeve.
(D) The outer tube and the inner tube are connected by a cylindrical holder, and a cylindrical stopper having a diameter larger than that of the inner tube is connected to the proximal end of the inner tube. A proximal end surface on which the distal end surface of the stopper can come into contact is formed.
(E) The elastic member is provided between the front end side end surface of the cylindrical stopper and the base end side end surface.
(F) The base end portion of the rod body is prevented from being detached from the outer tube by the snap ring, and the distal end portion of the pipe body is prevented from being detached from the inner tube by the snap ring.

  In the present invention, two or more movable bearings are always maintained at equal intervals in the axial direction by a coil spring during expansion and contraction work, so even when the rod 71 has a longer dimension than the conventional one. , Can stably support the rotating rod. Therefore, according to the present invention, it is possible to realize a long collar portion as compared with the prior art and a stable operation.

It is a perspective view which shows the use condition of the working machine of one Embodiment of this invention. It is a side view of the working machine which is in the state where the heel part extended. It is a side view of the working machine which is in the state where the heel part contracted. It is sectional drawing of the collar part of the extended state. It is an expanded sectional view of the A section of FIG. It is an expanded sectional view of the B section of FIG. It is an expanded sectional view of the C section of FIG. It is the side view and enlarged sectional fragmentary view of an outer tube. It is IX-IX sectional drawing of FIG. It is an enlarged view of the D section of FIG. It is the side view and enlarged sectional fragmentary view of an inner pipe. It is an enlarged view of the E section of FIG. It is a side view of the working machine which is in the state where the buttocks contracted most. It is an expanded sectional view of the X section of FIG.

  FIG. 1 is a perspective view showing a usage state of a working machine according to an embodiment of the present invention. This working machine 1 is a Takaeda pruner. The work machine 1 includes a rotation drive unit 2 that generates a rotational force, a collar unit 3, a working unit 4 that receives the rotational force to perform work, and an operation unit 81 that controls the operation of the working unit 4. ing. The working unit 4 is a pruner having a reciprocating shear blade.

  The flange 3 connects the rotation drive unit 2 and the working unit 4. Further, the flange 3 is configured to transmit the rotational force generated by the rotation driving unit 2 to the working unit 4. Furthermore, the collar part 3 is comprised so that expansion-contraction is possible.

  FIG. 2 is a side view of the work machine 1 in a state in which the flange portion 3 is extended. FIG. 3 is a side view of the work machine 1 in a state in which the collar portion 3 is contracted. FIG. 4 is a cross-sectional view of the eaves part 3 in an extended state. As shown in FIG. 4, the flange portion 3 extends in a state where the proximal end tube 5, the expandable / contractible tube body 6, the proximal end tube 5 and the tube body 6 can rotate, and the tubular body 6. And a shaft body 7 that can be expanded and contracted. The tubular body 6 includes an outer tube 61 on the rotational drive unit 2 side, that is, the proximal end side, and an inner tube 62 on the working unit 4 side, that is, the distal end side. The outer diameter of the inner tube 62 is smaller than the inner diameter of the outer tube 61. For example, the outer diameter of the outer tube 61 is 35 mm, and the outer diameter of the inner tube 62 is 24 mm. The shaft body 7 includes a rod body 71 extending in a rotatable state in the proximal end tube 5 and the outer tube 61, and a pipe body 72 extending in a rotatable state in the inner tube 62. Yes. The length of the rod 71 is, for example, 2071 mm. The length of the pipe body 72 is 1465 mm, for example. And the length of the collar part 3 is 2.1 m, for example, when contracted, and 3.3 m when extended. The rod 71 is formed by processing a metal material that has been heat-treated in advance. As the metal material, for example, a hard steel wire (SWRH) can be used.

  FIG. 5 is an enlarged cross-sectional view of a portion A in FIG. 2 and shows a connection structure between the rotation drive unit 2 and the collar unit 3. The rotation drive unit 2 has a rotating cylinder part 23 protruding from a clutch drum (not shown) in a casing 21 having an output part 20. The rotating cylinder portion 23 is a portion that outputs the rotational force of the rotation driving portion 2. The rotating cylinder portion 23 is supported in the casing 21 via a bearing (not shown). A proximal end portion 5 </ b> A of the proximal end tube 5 is inserted into the output portion 20. The rod body 71 has a square cross section, but the base end portion 71 </ b> A has a circular cross section and is spline-fitted into the rotary cylinder portion 23. Accordingly, the rod body 71 is connected to the rotating cylinder portion 23, and thus the rotational force of the rotation driving unit 2 is transmitted to the rod body 71. In addition, in the base end pipe | tube 5, the rod 71 is rotatably supported by the bearing 77 located in the base end part 5A. The bearing 77 includes a bearing 771 that rotatably supports the rod 71 and a holder 772 into which the bearing 771 is press-fitted. The holder 772 is press-fitted and fixed to the proximal end of the proximal end tube 5.

  Further, as shown in FIG. 5, the proximal tube 5 is set to a diameter D <b> 1 that can be fitted into the connecting hole 25 having a specified size of the output unit 20 of various rotation driving units 2. D1 is generally 24 mm. The proximal end tube 5 is fitted in the connection hole 25 and is fixed to the output unit 20 by tightening the bolt 201.

  Thereby, the rotation drive part 2 is attached to the base end pipe | tube 5 of the base end side of the collar part 3. As shown in FIG.

  6 is an enlarged cross-sectional view of a portion B in FIG. An operation portion 81 and a belt attachment portion 82 are externally fitted and fixed to the proximal end tube 5 from the proximal end side. The operation unit 81 is a trigger type operation unit having a throttle lever.

  FIG. 7 is an enlarged cross-sectional view of a portion C in FIG. 2 and shows a connection structure between the proximal tube 5 and the outer tube 61. The proximal end pipe 5 and the outer pipe 61 are connected by a pipe joint 91. On the other hand, as shown in FIG. 8, five bearings 63A, 63B, 63C, 63D, and 63E are arranged in the outer tube 61. These bearings support the rod 71 in a rotatable manner. FIG. 7 shows the bearing 63A located closest to the base end.

  The bearing 63A includes a square hole bush 631 into which the rod 71 is inserted, a bearing 632 into which the square hole bush 631 is press-fitted, and a bush holder 633 into which the bearing 632 is press-fitted. The inner diameter of the square hole bush 631 is slightly larger than the outer diameter of the rod body 71, and the rod body 71 rotates together with the square hole bush 631. The outer diameter of the bush holder 633 is slightly smaller than the inner diameter of the outer tube 61, and the bush holder 633 is provided so as not to rotate and to move in the axial direction with respect to the outer tube 61. 9 is a cross-sectional view taken along the line IX-IX in FIG. As shown in FIG. 9, the bush holder 633 is not rotatable with respect to the outer tube 61 because the concave portion 635 on the peripheral surface is fitted into the convex portion 636 on the inner surface of the outer tube 61. On the other hand, the convex portions 636 are formed at four circumferentially spaced intervals on the inner surface of the outer tube 61 and extend in the axial direction. The recesses 635 are formed at four circumferentially spaced intervals on the circumferential surface of the bush holder 633 and extend in the axial direction. Therefore, the bush holder 633 can move in the axial direction along the convex portion 636. The height of the convex portion is about 0.5 mm, for example.

  The other four bearings 63B, 63C, 63D, and 63E have the same structure as the bearing 63A. As will be described later, the bearing 63A is urged toward the base end side by the coil spring 65 and is pressed against the end surface 911 of the pipe joint 91. The other four bearings 63B, 63C, 63D, and 63E are provided in the middle of the outer tube 61 in the axial direction, and are thus movable in the axial direction.

  On the other hand, a stopper 64 having the same shape as the bush holder 633 is provided on the distal end side of the outer tube 61. The stopper 64 is non-rotatable and axially movable with respect to the outer tube 61, like the bearing 63B. As will be described later, the base end portion 62A of the inner tube 62 is connected to the stopper 64.

  As shown in FIG. 8, the five bearings 63A, 63B, 63C, 63D, 63E and the stopper 64 are arranged at equal intervals in the axial direction by disposing a coil spring 65 having the same physical properties between them. Maintained. For example, between the bearing 63C and the bearing 63D, one end of the coil spring 65 is in contact with the end surface on the front end side of the bush holder 633 of the bearing 63C, and the other end is on the end surface on the base end side of the bush holder 633 of the bearing 63D. It is in contact. The other coil springs 65 are similarly arranged.

  FIG. 10 is an enlarged view of a portion D in FIG. 2 and shows a connection structure of the outer tube 61 and the shaft body 71, the inner tube 62 and the pipe body 72. An inner tube 62 is inserted into the outer tube 61 from the distal end side. The inner tube 62 is fixed to the outer tube 61 by the cylindrical holder 31. Thereby, the outer tube 61 and the inner tube 62 are connected. The holder 31 is provided from the distal end portion 61 </ b> B of the outer tube 61 to the inner tube 62.

  The holder 31 includes a base end portion 31 </ b> A surrounding the outer tube 61 and a distal end portion 31 </ b> B surrounding the inner tube 62. The proximal end portion 31 </ b> A is fixed to the outer tube 61 by tightening the bolt 311. The tip 31B is fixed to the inner tube 62 via a resin sleeve 315 by tightening the knob bolt 312. The inner tube 62 is fitted into the sleeve 315. The holder 31 is configured to fix the inner tube 62 to the outer tube 61 by fixing the base end portion 31 </ b> A to the outer tube 61 and the distal end portion 31 </ b> B to the inner tube 62.

  A proximal end portion 62 </ b> A of the inner tube 62 inserted into the outer tube 61 is fitted into the stopper 64 and fixed by a rivet 625. A cylindrical body 66 made of an elastic material is provided between the distal end side end surface 641 of the stopper 64 and the proximal end side end surface 319 of the distal end portion 31B of the holder 31. The cylindrical body 66 is externally fitted to the inner tube 62.

  Further, as shown in FIG. 10, the rod body 71 and the pipe body 72 are connected by a connecting pipe 73. Specifically, the connecting pipe 73 has a distal end portion 73 </ b> B fitted and fixed to a proximal end portion 72 </ b> A of the pipe body 72, and the proximal end portion 73 </ b> A has a square hole 730. And the rod 71 is inserted in the square hole 730. Thereby, the rod body 71 and the pipe body 72 are connected, and therefore the rotational force of the rod body 71 is transmitted to the pipe body 72 only through the connection pipe 73.

  As shown in FIG. 11, the pipe body 72 is rotatably supported by four bearings 75 </ b> A, 75 </ b> B, 75 </ b> C, 75 </ b> D and a bearing 76 in the inner tube 62. These four bearings are arranged at equal intervals in the axial direction, and are fixed in the inner tube 62. The most proximal bearing 75A is composed of a metal bush 751 into which the pipe body 72 is inserted and a bush holder 752 into which the metal bush 751 is press-fitted. The pipe body 72 is supported so as to be rotatable in the metal bush 751. The bush holder 752 is made of an elastic material. The other three bearings 75B, 75C, and 75D also have the same structure as the bearing 75A.

  FIG. 12 is an enlarged view of a portion E in FIG. 2 and shows a connection structure between the flange portion 3 and the operating portion 4. A distal end portion 62B of the inner tube 62 of the flange portion 3 is fitted into the mounting hole 41 of the operating portion 4 and is fixed to the mounting hole 41 by bolts 42 and 43. Further, the distal end portion 72 </ b> B of the pipe body 72 exposed to the distal end side from the inner tube 62 is spline-fitted to the inner portion of the mounting hole 41. Thereby, the collar part 3 and the action | operation part 4 are connected. The bearing 76 located in the distal end portion 62B includes a bearing 761 that rotatably supports the pipe body 72 and a holder 752 into which the bearing 761 is press-fitted. The holder 762 is press-fitted and fixed to the tip of the inner tube 62.

  As shown in FIG. 5, on the base end side of the bearing 75 </ b> A, the rod body 71 is provided with a snap ring 91, whereby the rod body 71 is prevented from being detached from the outer tube 61. . Further, as shown in FIG. 12, the pipe body 72 is provided with a snap ring 92 on the tip end side of the bearing 76, so that the pipe body 72 is prevented from being detached from the inner tube 62. Yes.

  In the work machine 1 having the above-described configuration, when the rotation driving unit 2 is operated, the rotating cylinder unit 23 is rotated, and accordingly, the rod 71 is rotated, and accordingly, the connecting pipe 73 is rotated. , The pipe body 72 is rotated, whereby the working unit 4 is operated. That is, the rotational force of the rotation drive unit 2 is transmitted to the operation unit 4 through the collar unit 3, and the work is executed.

In the work machine 1 having the above-described configuration, the expansion and contraction work of the collar portion 3 is performed as follows.
(A) When shrinking the flange 3 The knob bolt 312 of the holder 31 is loosened so that the inner tube 62 is free with respect to the outer tube 61, and the inner tube 62 is inserted into the outer tube 61. At this time, in the outer tube 61, the stopper 64 that moves together with the inner tube 62 moves toward the base end side while compressing the coil spring 65, and accordingly, all the coil springs 65 are evenly compressed. To go.

  Then, after inserting the inner tube 62 to an arbitrary position in the outer tube 62, the knob bolt 312 is tightened to fix the inner tube 62 to the outer tube 61. Thereby, the collar part 3 will be in the contracted state. The state in which all the coil springs 65 are compressed most is the state in which the flange portion 3 is most contracted. FIG. 13 is a side view of the work machine 1 in a state where the collar portion 3 is most contracted. 14 is an enlarged cross-sectional view of a portion X in FIG.

(B) When extending the collar portion 3 The knob bolt 312 of the holder 31 is loosened to make the inner tube 62 free with respect to the outer tube 61, and the inner tube 62 is pulled out from the outer tube 61. At this time, in the outer tube 61, the coil spring 65 extends uniformly as the stopper 64 moves toward the distal end side. That is, since the inner tube 62 is pulled out while being urged by the coil spring 65, the inner tube 62 is pulled out automatically or with a small force.

  After the inner tube 62 is pulled out from the outer tube 62 by an arbitrary length, the knob bolt 312 is tightened to fix the inner tube 62 to the outer tube 61. Thereby, the collar part 3 will be in the extended state.

  When the inner tube 62 is most pulled out, the distal end side end face 641 of the stopper 64 is connected to the proximal end side end face 319 of the distal end portion 31B of the holder 31 through the cylindrical body 66 as shown in FIGS. Abut. Therefore, the stopper 64 prevents the inner tube 62 from being pulled out from the outer tube 61. In addition, since the cylindrical body 66 is made of an elastic material, the abutting of the stopper 64 is buffered, and therefore, the impact when the inner tube 62 is most drawn out is reduced.

  And the working machine 1 of the said structure can exhibit the following effects further.

(1) The rod body 71 is supported by five bearings 63A, 63B, 63C, 63D, and 63E arranged at equal intervals in the axial direction, and the five bearings 63A, 63B, 63C, 63D, and 63E are supported. And the stopper 64 is always maintained at equal intervals in the axial direction by the coil spring 65 during the expansion and contraction work. Therefore, even when the rod 71 has a long dimension exceeding 2000 mm, the rotating rod 71 can be stably supported. Therefore, it is possible to realize a long flange 3 as compared with the conventional case and a stable operation.

(2) Since the pipe body 72 is supported by the four bearings 75A, 75B, 75C, 75D and the bearing 76 arranged at equal intervals in the axial direction, the pipe body 72 has a long dimension exceeding 1400 mm. Even if it exists, the rotating pipe body 72 can be supported stably. Therefore, also from this point, it is possible to realize a long flange 3 as compared with the conventional case and a stable operation.

(3) Since the rod 71 is formed by processing a previously heat-treated metal material, the rod 71 is distorted even if the rod 71 has a long dimension exceeding 2000 mm. Therefore, the rotating rod 71 can be stably supported. Therefore, also from this point, it is possible to realize a long flange 3 as compared with the conventional case and a stable operation.

(4) Since the base end portion 71 </ b> A of the rod body 71 is spline-fitted into the rotary cylinder portion 23 of the rotation drive portion 2, the rotation drive portion 2 can be easily attached to and detached from the rod body 71. .

(5) Since the distal end portion 72B of the pipe body 72 is spline-fitted into the inner part of the mounting hole 41 of the working portion 4, the work portion 4 can be easily attached to and detached from the pipe body 72.

(6) Since the tip 31B of the holder 31 is fixed to the inner tube 62 via the resin sleeve 315, when the knob bolt 312 is loosened, the inner tube 62 is attached to the holder 31. The inner tube 62 can be firmly fixed to the holder 31 when the knob bolt 312 is tightened.

(7) When the inner pipe 62 is most pulled out, the distal end side end face 641 of the stopper 64 contacts the proximal end side end face 319 of the distal end portion 31B of the holder 31 via the cylindrical body 66. The pipe 62 can be prevented from being pulled out from the outer pipe 61.

(8) Since the cylindrical body 66 is made of an elastic material, it is possible to buffer an impact when the distal end side end face 641 of the stopper 64 abuts on the proximal end side end face 319 of the holder 31, and therefore the inner pipe 62 is pulled out most. The shock of time can be eased.

(9) Since the snap ring 91 is provided on the rod body 71 on the base end side of the bearing 75A, the rod body 71 comes out of the outer tube 61 when the rotary operation portion 2 is removed from the flange portion 3 or the like. Can be prevented.

(10) Since the snap ring 92 is provided on the pipe body 72 at the tip end side of the bearing 76, the pipe body 72 is prevented from coming out of the inner tube 62 when the working part 4 is removed from the flange part 3 or the like. Can be prevented.

  In the above-described embodiment, four movable bearings (bearings 63B, 63C, 63D, and 63E) are provided. However, the number of movable bearings may be two or more.

  The working machine of the present invention has a large industrial utility value because it can realize a long collar portion and a stable operation as compared with the prior art.

  DESCRIPTION OF SYMBOLS 1 Work implement 2 Rotation drive part 3 Gutter 31 Holder 31A Base end part 31B (Holder) tip end 319 (Holder) base end side end face 4 Working part 5 Base end pipe 6 Tubing body 61 Outer pipe 62 Inner pipe 63B, 63C, 63D, 63E Movable bearing 64 Stopper 641 (End of stopper) End side end face 65 Coil spring 7 Shaft body 71 Rod body 71A (Base body) Base end 72 Pipe body 72B (Pipe body) Tip 81 Operation section 91, 92 Snap ring

Claims (7)

A rotational drive that generates rotational force;
A working unit that receives the rotational force and performs the work;
A collar that connects the rotational drive unit and the working unit and transmits the rotational force generated by the rotational drive unit to the working unit;
An operation unit for operating the working unit;
In a work machine equipped with
The collar part is connected to the rotation driving part and the operation part is attached to the proximal end tube, the telescopic tube body, and the base end tube and the tubular body extend in a rotatable state and can be expanded and contracted together with the tubular body. A shaft body, and
The tubular body includes an outer tube on the rotation drive unit side and an inner tube on the working unit side, and the inner tube can be inserted into the outer tube,
The shaft body includes a rod body extending in the proximal tube and the outer tube, and a pipe body extending in the inner tube, and the rod body can be inserted into the pipe body,
The rod body is rotatably supported by three or more bearings in the outer tube, and the bearing is provided in the outer tube so as to be non-rotatable and axially movable.
All the bearings are maintained at regular intervals in the outer pipe by interposing coil springs with the same physical properties,
When the inner tube is inserted into the outer tube and the rod body is contracted by being inserted into the pipe body, the inner tube compresses the coil spring evenly.
A working machine characterized by that. The rod is formed by processing a metal material that has been heat-treated in advance.
The work machine according to claim 1. The base end of the rod is connected to the rotary drive by spline fitting,
The tip of the pipe body is connected to the working part by spline fitting,
The work machine according to claim 1 or 2. The outer tube and inner tube are connected by a cylindrical holder,
The base end of the cylindrical holder is fixed to the outer tube,
The tip of the cylindrical holder is fixed to the inner tube by tightening the knob bolt, and is in contact with the inner tube via a resin sleeve.
The work machine according to any one of claims 1 to 3. The outer tube and inner tube are connected by a cylindrical holder,
A cylindrical stopper larger in diameter than the inner tube is connected to the proximal end of the inner tube,
The cylindrical holder has a proximal end surface on which the distal end surface of the cylindrical stopper can come into contact.
The work machine according to any one of claims 1 to 3. An elastic member is provided between the distal end side end surface of the cylindrical stopper and the base end side end surface.
The working machine according to claim 5. The base end of the rod is secured against the outer tube by a snap ring,
The tip of the pipe body is secured against the inner tube by a snap ring.
The work machine according to any one of claims 1 to 6.

Images