JP2012077852A - Connecting structure of pole and cutting tool for high branch having the structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting structure of poles allowing work of cutting high branches to be efficiently performed, by maintaining a function of reliably locking a second pole at a predetermined insertion position with respect to a first pole for a long period of time.SOLUTION: The connecting structure 14 of poles connects a first pole 16 and a second pole 17 with each other by locking the second pole 17 at a predetermined insertion position with respect to the first pole 16 while the second pole 17 is inserted into the first pole 16. The structure includes: a first engaging projection 26 provided as movable forward or backward between a protruding position where the projection protrudes outside the second pole 17 and a pressed position where the projection is pressed into inside the first pole 16; a first energizing means 28 that energizes the first engaging projection 26 from the pressed position to the protruding position; and holder 29 fixed inside the second pole 17 and attached thereto and provided with the first energizing means 28.

Description

  The present invention relates to a pole connection structure for connecting a plurality of poles, and a high branch cutting tool including the same.

  An example of a conventional pole connection device is shown in FIGS. 5 and 6 (see, for example, Patent Document 1). As shown in FIG. 5, the pole connecting device 1 has a first pole 2 and a second pole 3 with the rear end of the second pole 3 inserted into the tip of the first pole 2. The connection is made.

  A cylindrical tip portion 4 is provided at the tip portion of the first pole 2, and a cylindrical reinforcing portion 5 is fixedly attached to the outside of the cylindrical tip portion 4. The cylindrical reinforcing portion 5 reinforces the cylindrical distal end portion 4 from the periphery and reduces the diameter of the cylindrical distal end portion 4, so that the inner surface of the cylindrical distal end portion 4 of the first pole 2 is connected to the cylindrical distal end portion 4. It can be brought into pressure contact with the outer surface of the rear end portion of the second pole 3 inserted therein.

  Accordingly, the rear end portion of the second pole 3 can be fixed and connected to the front end portion of the first pole 2 so that there is no backlash.

  As shown in FIG. 5, a spring 6 is arranged in the second pole 3, and this spring 6 is screwed to the inner surface of the cylindrical rear end portion 8 of the second pole 3 by a fixing screw 7. Yes. An engagement pin 9 is provided at the tip of the spring 6, and the engagement pin 9 is inserted through the insertion hole 10 provided in the second pole 3 and the cylindrical rear end 8, and the second It is biased by a spring 6 so as to protrude to the outside of the pole 3.

  Further, the engaging pin 9 projects in the cylindrical shape through the engaging hole 11 formed in the cylindrical tip portion 4 and the cylindrical reinforcing portion 5 of the first pole 2 in a state of protruding to the outside of the second pole 3. It is comprised so that it can protrude outside the reinforcement part 5. FIG.

  In the connection state shown in FIG. 5, the engagement pins 9 are inserted through the insertion holes 10 provided in the second pole 3 and the engagement holes 11 provided in the first pole 2 and the like. And since it engages with the engagement hole 11, the second pole 3 cannot be separated from the first pole 2.

  In the connection state shown in FIG. 5, the operator swings counterclockwise to open the lever 12 (release operation) and pushes the protrusion 13 with the finger of the engagement pin 9. It can be removed from the engagement hole 11 provided in the first pole 2 or the like, whereby the second pole 3 can be separated from the first pole 2.

  In addition, the operator engages by inserting the cylindrical rear end portion 8 etc. of the second pole 3 into the cylindrical tip end portion 4 etc. of the first pole 2 while the first and second poles 3 are not connected. The pin 9 is engaged with the insertion hole 10 and the engagement hole 11, and in this state, the lever 12 is swung in the clockwise direction (locking operation), whereby the rear end portion of the second pole 3 is moved. It can fix and connect with respect to the front-end | tip part of the 1st pole 2 so that there is no backlash.

JP 2010-99014 A

  However, in the conventional pole connecting device 1, as shown in FIG. 6, the spring 6 provided with the engagement pin 9 is screwed to the inner surface of the cylindrical rear end portion 8 of the second pole 3 by the fixing screw 7. Since the structure is fixed by a stopper, when the work for cutting the high branch is performed using, for example, a high branching saw in which the pole connecting device 1 is used, the fixing screw 7 may be loosened. is there.

  As described above, when the fixing screw 7 is loosened, the spring 6 is loosely attached to the second pole 3, and the engagement pin 9 is provided at the cylindrical tip portion 4 of the first pole 2. The second pole 3 may fall out of the first pole 2 when using the high-pruning saw. In such a case, the cutting operation of the high branches is interrupted, and the work efficiency is reduced.

  The present invention has been made to solve the above-described problems, and can maintain the function of reliably locking the second pole with respect to the first pole at a predetermined insertion position over a long period of time. It is an object of the present invention to provide a pole connection structure that can efficiently perform a cutting operation of a high branch and a high branch cutting tool including the same.

  In the pole connection structure according to the present invention, the second pole is locked at a predetermined insertion position with respect to the first pole in a state where the second pole is inserted into the first pole, and In the pole connection structure for connecting the pole and the second pole to each other, the pole is connected between a protruding position protruding outside the second pole and a pushing position pushed inside the first pole. A first engagement convex portion, a first engagement hole provided in the first pole and engaged with the first engagement convex portion in the protruding position, and the first engagement convex portion are provided. First urging means for urging the first engaging convex portion from the push-in position side toward the protruding position side, and the first urging means fixedly mounted in the second pole are provided. And a holder.

  According to the pole connection structure of the present invention, when the second pole is inserted into the predetermined insertion position with respect to the first pole, the first biasing means projects toward the projecting position outside the second pole. The biased first engagement convex portion can enter and engage with the first engagement hole provided in the first pole. Accordingly, the second pole can be locked at a predetermined insertion position so as not to move in the insertion direction with respect to the first pole, and the first pole and the second pole can be connected to each other. Then, when the operator pushes the first engagement convex portion with a finger or the like to disengage from the first engagement hole and moves to the push position, the engagement between the first engagement convex portion and the first engagement hole is established. The state can be released. Thereby, for example, the insertion position of the second pole with respect to the first pole can be changed to adjust the lengths of the first and second poles, or the first pole and the second pole can be separated from each other.

  Further, the first engaging convex portion is provided on the holder via the first biasing means, and the holder is fixedly attached in the second pole. It can be fixed and attached so as not to be displaced with respect to the pole.

  In this invention, the first urging means is an elastic support portion provided in the holder, and can be inserted into the holder and prevented from being detached by a retaining pin.

  If it does in this way, the 1st engagement convex part will be provided in the elastic support part as the 1st energizing means, and this 1st energizing means will be inserted in a holder, and it will be prevented by a retaining pin, It is fixedly attached to the holder. And since this holder is fixed and attached in the 2nd pole, it can fix and attach so that a 1st engagement convex part may not shift to a 2nd pole.

  In this invention, the second engagement hole provided in the second pole, the second engagement convex portion engageable with the second engagement hole, the holder, and the second engagement Protruding portions are provided, and second urging means for urging the second engaging convex portions in the direction toward the second engaging holes can be provided.

  In this way, when the holder is inserted into the predetermined mounting position with respect to the second pole, the second engagement convex portion biased in the direction toward the second engagement hole by the second biasing means is It can enter into the 2nd engagement hole provided in 2 poles, and can engage. As a result, the holder can be locked to a predetermined mounting position with respect to the second pole, and can be fixedly mounted at the mounting position so as not to be displaced.

  In the present invention, the second urging means is an elastic support portion provided in the holder, and the holder, the second urging means, and the second engaging convex portion are integrally formed. It can be.

  As described above, when the holder, the second urging means, and the second engaging convex portion are integrally formed, the second engaging convex portion is engaged with the second engaging hole provided in the second pole. By doing so, the holder can be securely fixed and attached so as not to be displaced with respect to the second pole.

  In this invention, the holder has an elastic part for diameter expansion, and the outer surface of the holder presses the inner surface of the second pole by the elastic force of the elastic part for diameter expansion.

  In this way, the outer surface of the holder can be brought into pressure contact with the inner surface of the second pole by the elastic force of the elastic member for expanding the diameter, thereby reducing the frictional resistance between the outer surface of the holder and the inner surface of the second pole. Can be bigger. As a result, the holder can be firmly attached so as not to be displaced with respect to the second pole and without rattling.

  In this invention, the holder has a divided body divided into two, and the two divided bodies can be connected to each other through the elastic part for diameter expansion.

  If it does in this way, two each division bodies which constitute a holder can be pressed against the inner surface of the 2nd pole with the elastic force of the elastic part for diameter expansion. As described above, when the two divided members constituting the holder are pressed against the inner surface of the second pole, the two respective divided members of the holder exert respective frictional forces acting on the inner surface of the second pole. The holders can be substantially equal, and the holder can be firmly attached to the second pole in a stable state so as not to be displaced in the insertion direction and without rattling.

  In the present invention, a diameter expanding hole is provided between the two divided bodies, and at least the inlet side portion into which the male screw is screwed is opposed to or coupled to the respective divided bodies. It can be divided into two semi-cylindrical parts.

  In this way, when a countersunk screw (male screw) is screwed into the hole for diameter expansion with the holder inserted into the second pole, the head of the disk screw is used for diameter expansion by the wedge action. Each of the two semi-cylindrical portions formed at least on the inlet side of the hole can be deformed outward in the radial direction. And each of these two semi-cylindrical parts can spread and press each of the two divided members constituting the holder against the inner surface of the second pole. Accordingly, the holder can be firmly attached so as not to be displaced in the insertion direction with respect to the second pole and without rattling.

  In addition, when inserting the holder into the second pole and aligning and attaching the holder, the operator inserted the tip of the rod-shaped body into the second pole using, for example, a rod-shaped body. By inserting the holder into the hole for expanding the diameter and pushing the boulder forward, the holder can be easily positioned and attached to the second pole.

  In the present invention, the first pole and the second pole may be a cylindrical body having a substantially elliptical cross section.

  In this way, by using the first pole and the second pole having a substantially elliptical cross section, the circumferential alignment of the first and second poles can be easily performed. Thereby, the first engagement convex portion can be easily engaged with the first engagement hole. Therefore, the attachment of the holder to the second pole and the connection between the first pole and the second pole can be easily performed in a short time, and the length adjustment of the first and second poles can be easily performed in a short time. be able to.

  The high branch cutting tool according to the present invention is provided with the pole connection structure of the present invention, and a blade is provided at the tip of the pole.

  The high branch cutting tool according to the present invention includes the pole connection structure of the present invention, and this pole connection structure operates in the same manner as described above. When cutting a high branch using this high branch cutting tool, the first pole (or the second pole) is connected to the second pole (or the first pole) so as to have an appropriate length for cutting the high branch. ) Can be used in addition, and the first and second poles can be extended and used. In this way, the high branch cutter can be adjusted to a desired length and used.

  In the present invention, a pole locking mechanism that can be fixed to a length of the first pole and the second pole adjusted to a desired length can be provided.

  According to this pole locking mechanism, the first pole and the second pole are stretched or connected so that the second pole is not rattled with respect to the first pole in a state adjusted to a desired length. Can be fixed. In this way, if the backlash between the first pole and the second pole can be eliminated, the blade provided at the tip of the pole can be accurately and stably applied to the high branch. The cutting work can be facilitated, and the workability of the cutting work can be improved.

  According to the pole connection structure according to the present invention and the high-edged cutting tool including the pole, the first engagement convex portion is provided on the holder via the first biasing means, and the holder is fixed in the second pole. Therefore, the first engaging convex portion can be firmly attached to the second pole so as not to be displaced with respect to the second pole by this holder. The engagement / disengagement function with respect to one engagement hole is unlikely to be lowered by, for example, cutting work of a high branch, and the engagement / disengagement function can be maintained for a long time.

  In addition, since the engagement / disengagement function can be maintained for a long period of time, the function of reliably locking the second pole to the predetermined insertion position with respect to the first pole for a long period of time can be maintained, so that the engagement / disengagement function is lowered. Therefore, it is possible to prevent the workability of the high branch cutting work from being deteriorated or the work itself from being interrupted. Therefore, it is possible to efficiently perform the cutting operation of the high branches.

It is a longitudinal cross-sectional view which shows the connection structure of the pole with which the high branch cutting tool which concerns on one Embodiment of this invention is provided. It is a figure which shows the holder with which the connection structure of the pole which concerns on the same embodiment is provided, (a) is a front view, (b) is a left view, (c) is a right view, (d) is a plane FIG. 4E is a longitudinal sectional view. It is a figure which shows the locking mechanism of the pole which concerns on the embodiment, (a) is a longitudinal cross-sectional view which shows a releasing state, (b) is a longitudinal cross-sectional view which shows a locked state. It is a fragmentary sectional view which shows the high branch cutting tool concerning the embodiment. It is a partial expanded sectional view which shows the conventional pole connection apparatus. FIG. 6 is a partially enlarged cross-sectional view showing an engagement pin provided on the second pole side in the conventional pole connecting apparatus shown in FIG. 5.

  Hereinafter, an embodiment of a high-branch cutting tool having a pole connection structure according to the present invention will be described with reference to FIGS. For example, as shown in FIG. 4, the pole connection structure 14 is applied to a high branch cutting tool (saw with a high branching sickle) 15. The pole connection structure 14 is configured such that the second pole 17 is inserted into the first pole 16 with a predetermined insertion in the state where the second pole 17 is inserted into the first pole 16 provided in the high branch cutting tool 15. The first pole 16 and the second pole 17 are connected to each other by being locked in position.

  As shown in FIG. 4, the high branch cutting tool 15 is of a two-stage type including a first pole 16 and a second pole 17, and a sickle saw 18 is attached to the tip of the second pole 17. It is attached with bolts 20 through 19.

  The saw with a sickle 18 has a saw part 18a, and a tip sickle part 18b is provided integrally with the saw part 18a at the upper end of the saw part 18a. And the base end sickle part 18c is attached to this saw part 18a with the volt | bolt 21 at the lower end part of the saw part 18a so that attachment or detachment is possible.

  As shown in FIG. 4, the high branch cutting tool 15 includes a shortened state in which the second pole 17 is inserted into the first pole 16, and a second pole 17 that is not shown in the drawing. It can expand and contract to the extended state pulled out from. In the shortened state and the extended state, the second pole 17 is locked at a predetermined insertion position with respect to the first pole 16 by the connecting structure 14 of the pole, and the first pole 16 and the second pole 17 Can be connected to each other.

  A pole locking mechanism 22 is provided at the tip of the second pole 17. This pole locking mechanism 22 can be fixed to the length of the first pole 16 and the second pole 17 adjusted to a desired length. Therefore, the first and second poles 16 and 17 can be fixed in a shortened state and an extended state. Therefore, the operator can adjust the expansion and contraction of the high branch cutting tool 15 to a desired shortened state or extended state so that the high branch cutting work can be easily performed, and can use this high branch cutting tool 15 to cut the high branch. .

  Further, as shown in FIG. 4, the pole connection structure 14 is attached to the first connection main body portion 23 attached to the distal end side portion in the second pole 17 and the proximal end side portion in the second pole 17. The second connection main body 24 is formed, and one first engagement hole 25 is formed at the tip side of the first pole 16.

  As shown in FIG. 4, when the high branch cutting tool 15 is used in a predetermined shortened state, the first engagement convex portion of the first connection main body portion 23 attached to the tip side portion in the second pole 17. 26 is engaged with a first engagement hole 25 formed at the tip side of the first pole 16, and in this state, the lock mechanism 22 of the pole is brought into a locked state.

  Although not shown in the figure, when the second pole 17 is pulled out from the first pole 16 and used in a predetermined extended state, the high branch cutting tool 15 is attached to the proximal end side portion in the second pole 17. (2) The first engagement convex portion 26 of the connection main body 24 is engaged with the first engagement hole 25 formed in the tip side portion of the first pole 16, and in this state, the lock mechanism 22 of the pole is locked. Put it in a state.

  Next, the pole connection structure 14 will be described with reference to FIG. However, since the first connection main body portion 23 and the second connection main body portion 24 of the pole connection structure 14 are equivalent, the respective components are denoted by the same reference numerals and the first connection main body portion 23 will be described. Description of the second connection main body 24 is omitted.

  As shown in FIG. 1, the first connection main body 23 includes a first engagement convex portion 26. The first engaging convex portion 26 is an inverted cup-shaped member, and a protruding position protruding outside the first and second poles 16 and 17 and the inner side of the first pole 16 as shown by a two-dot chain line. It is provided so as to be able to advance and retreat between the push-in positions to be pushed into.

  As shown in FIG. 1, an insertion hole 27 through which the first engagement convex portion 26 is inserted is formed in the peripheral wall of the second pole 17 to which the first connection main body portion 23 is attached. The first engaging convex portion 26 is also inserted into the first engaging hole 25 formed in the first pole 16 while being inserted into the insertion hole 27. In this way, with the second pole 17 inserted into the first pole 16, the second pole 17 is locked to a predetermined insertion position (shortened position or extended position) with respect to the first pole 16. The first pole 16 and the second pole 17 can be connected to each other. The first engagement convex portion 26 is attached to the top surface of the distal end portion of the first urging means 28.

  As shown in FIG. 1, the first urging means 28 is an elastic support part formed by bending a metal plate-like spring member, and the first engagement convex part 26 is placed on the upper surface of the tip part. Has been. The first biasing means 28 biases the first engaging convex portion 26 from the pushing position side indicated by a two-dot chain line toward the protruding position indicated by a solid line. And when the 1st engagement convex part 26 exists in a protrusion position, the hook-shaped part 26a formed in the lower end part of this 1st engagement convex part 26 contact | abuts to the inner surface of the 2nd pole 17, and the 1st 1 engagement convex part 26 can be latched in a protrusion position.

  Further, as shown in FIG. 1, a bent end portion 28 a at the tip of the first urging means 28 is bent upward at a right angle, and this bent end portion 28 a is an inner concave portion of the first engaging convex portion 26. Is engaged. As a result, the first engaging convex portion 26 can be locked to the upper surface of the front end of the first urging means 28. A base end portion 28 b of the first urging means 28 is attached to the holder 29 in a coupled manner.

  As shown in FIG. 1, the holder 29 is for fixing and attaching the first urging means 28 to which the first engagement convex portion 26 is attached in the second pole 17. As shown in FIGS. 2B and 2C, the holder 29 has a substantially oval side surface, and is a member made of, for example, a synthetic resin, and is fixed to the inner surface of the second pole 17. It is attached.

  The first pole 16 and the second pole 17 have a substantially elliptical cross section, and are, for example, tubular members made of metal such as aluminum.

  As shown in FIG. 1, the attachment structure of the holder 29 to the inner surface of the second pole 17 is such that the outer surface of the holder 29 is in contact with the inner surface of the second pole 17 and is provided integrally with the holder 29. The second engaging convex part 31 formed on the upper surface of the tip part of the two urging means 30 is configured to engage with the second engaging hole 32 formed on the peripheral wall of the second pole 17.

  As described above, the outer surface of the holder 29 is in contact with the inner surface of the second pole 17, whereby the holder 29 can be regulated so that there is no backlash in the direction perpendicular to the central axis of the second pole 17. Further, the second engagement protrusion 31 is engaged with the second engagement hole 32 of the second pole 17, so that the holder 29 is restricted from moving in a direction parallel to the central axis of the second pole 17. can do.

  Further, as shown in FIG. 1, the second urging means 30 is an elongated plate-like elastic support portion, and the base end portion thereof is coupled to the holder 29, and the second urging means 30 has an upper surface on the top surface thereof. Is formed with a second engaging projection 31. The holder 29, the second urging means 30, and the second engaging convex portion 31 are integrally formed of, for example, synthetic resin.

  According to the second urging means 30, the second engagement convex portion 31 formed on the upper surface of the tip end portion is connected to the second engagement hole 32 formed in the second pole 17 from the second pole 17. It is energized in the outward direction toward. Therefore, as shown in FIG. 1, when the holder 29 is mounted at a predetermined position of the second pole 17, the second engagement convex portion 31 of the holder 29 engages with the second engagement hole 32 of the second pole 17, In this engaged state, the first engaging convex portion 26 provided on the holder 29 is inserted into and engaged with the insertion hole 27 of the second pole 17 and the first engagement hole 25 of the first pole 16. It has become.

  According to the pole connection structure 14 configured in this manner, the high branch cutting tool 15 is not shown in the drawing, as shown in FIG. 4, in a shortened state in which the second pole 17 is inserted into the first pole 16. However, when the second pole 17 is expanded and contracted to the extended state pulled out from the first pole 16, the second pole 17 is brought into a predetermined insertion position with respect to the first pole 16 in the shortened state and the extended state. The first pole 16 and the second pole 17 can be connected to each other by being locked.

  Further, as shown in FIG. 1, the base end portion 28a of the first urging means 28, which is a bent spring member, is mounted in a mounting hole 35 formed in a first divided body 33 described later of the holder 29. In this state, the retaining pin 37 is inserted into the retaining hole 36 formed in the base end portion of the first urging means 28. In this way, the base end portion 28 a of the first urging means 28 can be fixed so as not to come out of the mounting hole 35 formed in the first divided body 33 of the holder 29. The retaining pin 37 is fitted into a fitting hole 38 formed in the first divided body 33.

  Next, the holder 29 will be described in more detail with reference to FIGS. 1 and 2. As shown in FIGS. 2A to 2E, the holder 29 is a member having a substantially elliptical side surface, and includes a first divided body 33 and a second divided body 34 which are divided into upper and lower parts. have. Then, as shown in FIGS. 2B and 2C, the two first and second divided bodies 33 and 34 are formed by connecting each side portion of both flat portions formed opposite to each other. They are connected to each other via a diameter expanding elastic portion 39.

  As shown in FIGS. 2B and 2C, the two first and second divided bodies 33 and 34 are members whose side shapes are substantially semicircular.

  Each of the two diameter-enlarging elastic portions 39 is a thin plate-like portion bent in a spring shape, and is formed of synthetic resin integrally with the first and second divided bodies 33 and 34.

  The diameter-expanding elastic portion 39 can press the outer surfaces of the first and second divided bodies 33 and 34 of the holder 29 against the inner surface of the second pole 17 by the elastic force of the diameter-expanding elastic portion 39. is there.

  Further, as shown in FIG. 2, a short cylindrical diameter expanding hole 40 is provided between the two first and second divided bodies 33 and 34. The upper and lower side portions of the diameter expanding hole portion 40 are coupled to the first and second divided bodies 33 and 34, respectively. And, for example, two semi-cylindrical portions 42 that are coupled (opposed or abutted) to the first and second divided bodies 33 and 34, respectively, at least the inlet side portion into which a male screw such as a flat screw 41 is screwed, It is divided into 42.

  According to the diameter-expanding elastic portion 39, as shown in FIG. 1, the holder 29 is inserted into the second pole 17, and the second engaging convex portion 31 of the holder 29 is connected to the second engaging portion of the second pole 17. When, for example, a countersunk screw 41 (male screw) is screwed into the diameter expansion hole 40 in a state of being engaged with the hole 32, the head part 41a of the countersunk screw 41 is moved by the wedge action. Each of the two semi-cylindrical portions 42, 42 formed at least on the inlet side of each can be deformed outward in the radial direction (vertical direction). The two semi-cylindrical portions 42 and 42 push the two respective first and second divided bodies 33 and 34 constituting the holder 29 in the vertical direction and press them against the inner surface of the second pole 17. Can do. As a result, the holder 29 can be firmly attached to the second pole 17 without being displaced in the insertion direction and without rattling.

  In addition, as shown in FIG. 1, in order to insert the holder 29 into the second pole 17 and attach it, the second engagement protrusion 31 of the holder 29 is positioned in the second engagement hole 32 of the second pole 17. When trying to engage with each other, the operator uses, for example, a rod-shaped body (not shown) and the tip of the rod-shaped body is inserted into the diameter expansion hole 40 of the holder 29 inserted into the second pole 17. By inserting and pushing the boulder 29 forward, the second engaging convex portion 31 of the holder 29 can be easily aligned with and engaged with the second engaging hole 32 of the second pole 17. In this way, the holder 29 can be fixedly attached at a predetermined position in the second pole 17.

  In this embodiment, however, the countersunk screw 41 (for example, a tapping screw) is screwed into the synthetic resin diameter-expanding hole 40. Instead, a female thread is formed in the diameter-expanding hole 40. However, a countersunk screw 41 may be screwed into the female screw portion.

  Next, the operation of the pole connection structure 14 configured as described above and the high branch cutting tool 15 including the same will be described. Now, as shown in FIGS. 1 and 4, the two first and second connection main body portions 23 and 24 are attached to two predetermined positions in the second pole 17. As shown in FIG. 1, when the second pole 17 is inserted into a predetermined insertion position (shortened position or extended position) with respect to the first pole 16, the first urging means 28 moves the outer side of the second pole 17. The first engaging convex portion 26 urged so as to protrude toward the protruding position enters the first engaging hole 25 of the first pole 16 through the insertion hole 27 of the second pole 17. Can be engaged. As a result, the second pole 17 can be locked at a predetermined insertion position (shortened position or extended position) so as not to move in the insertion direction with respect to the first pole 16, and the first pole 16 and the second pole 17 can be locked. Can be connected to each other. In this way, the first and second poles 16 and 17 of the high branch cutting tool 15 can be shortened or extended.

  Then, when the operator pushes the first engagement convex portion 26 shown in FIG. 1 with a finger or the like to disengage it from the first engagement hole 25 and moves it to the push position indicated by the two-dot chain line, the first engagement is performed. The engagement state between the convex portion 26 and the first engagement hole 25 can be released. Accordingly, the insertion position of the second pole 17 with respect to the first pole 16 is changed, and the first and second poles 16 and 17 are adjusted to the extended state or the shortened state, or the first pole 16 and the second pole 17 are Can be separated from each other.

  Further, the first engaging convex portion 26 is provided on the holder 29 via the first urging means 28, and the holder 29 is fixedly attached in the second pole 17. The convex portion 26 can be fixed and attached to the second pole 17 so as not to be displaced.

  As a result, the first engagement convex portion 26 can be firmly attached to the second pole 17 by the holder 29 so as not to be displaced, and accordingly, the first engagement hole 25 of the first engagement convex portion 26 is secured. For example, the engagement / disengagement function is hardly lowered by cutting work of a high branch, and the engagement / disengagement function can be maintained for a long time.

  And since the engagement / disengagement function can be maintained for a long period of time, the second pole 17 can be reliably locked to a predetermined insertion position (shortened position or extended position) with respect to the first pole 16 for a long period of time. Therefore, it is possible to prevent the workability of the high branch cutting work from being lowered or the work itself from being interrupted by reducing or losing the engagement / disengagement function. Therefore, it is possible to efficiently perform the cutting operation of the high branches.

  Further, as shown in FIG. 1, the first engaging convex portion 26 is provided on the elastic support portion as the first urging means 28, and the first urging means 28 is inserted into the holder 29 and is removed. The stopper pin 37 prevents the stopper from being detached and is fixedly attached to the holder 29. Since the holder 29 is fixedly mounted in the second pole 17, the first engagement convex portion 26 can be securely fixed and mounted so as not to be displaced with respect to the second pole 17. it can.

  As shown in FIG. 1, when the holder 29 is inserted into a predetermined mounting position with respect to the second pole 17, the second biasing means 30 biases it in the direction toward the second engagement hole 32. The two engaging convex portions 31 can enter and engage with the second engaging holes 32 provided in the second pole 17. As a result, the holder 29 can be locked to the second pole 17 at a predetermined mounting position, and can be securely fixed and mounted at the mounting position so as not to be displaced.

  As shown in FIGS. 1 and 2, when the holder 29, the second urging means 30, and the second engagement convex portion 31 are integrally formed by resin molding, the second engagement convex portion 31 is By engaging the second engagement hole 32 provided in the two poles 17, the holder 29 is securely fixed at a predetermined mounting position shown in FIG. 1 so as not to be displaced with respect to the second pole 17. Can be attached. Then, the first engagement convex portion 26 can be reliably inserted into the insertion hole 27 of the second pole 17 with the holder 29 attached to the second pole 17. Thus, when the second pole 17 is moved to a predetermined shortened position or extended position, the first engagement convex portion 26 enters the first engagement hole 25 through the insertion hole 27 of the second pole 17. The second pole 17 can be securely locked in the shortened position or the extended position.

  Furthermore, the outer surface of each of the first and second divided bodies 33 and 34 of the holder 29 is pressed against the inner surface of the second pole 17 by the elastic force of the diameter-expanding elastic portion 39 shown in FIGS. Can be made. Thereby, almost all of the protruding amount of the second engaging protrusion 31 provided on the holder 29 shown in FIG. 1 is accommodated in the second engaging hole 32 of the second pole 17. It is possible to prevent the second engagement convex portion 31 from coming off from the second engagement hole 32. In this way, the holder 29 can be firmly attached so as not to be displaced with respect to the second pole 17 and without rattling.

  Then, the outer surface of each of the first and second divided bodies 33 and 34 of the holder 29 can be brought into pressure contact with the inner surface of the second pole 17 by the elastic force of the diameter-expanding elastic portion 39. The frictional resistance between the outer surface and the inner surface of the second pole 17 can be increased. As a result, the holder 29 can be firmly attached so as not to be displaced with respect to the second pole 17 and to be free from rattling.

  2B and 2C, the two first and second divided bodies 33 and 34 constituting the holder 29 are moved to the second pole 17 by the elastic force of the diameter-expanding elastic portion 39. When pressed against the inner surface, the respective first and second divided bodies 33, 34 of the holder 29 can have substantially the same frictional force acting on the inner surface of the second pole 17. Can be firmly attached to the second pole 17 in a stable state so as not to be displaced in the insertion direction and without rattling.

  Further, since the first and second poles 16 and 17 shown in FIG. 1 are tubular members having a substantially elliptical cross section, the first and second poles 16 and 17 can be easily aligned in the circumferential direction. it can. Accordingly, the first and second engaging protrusions 26 and 31 can be easily engaged with the first and second engaging holes 25 and 32, respectively. Therefore, the attachment of the holder 29 to the second pole 17 and the connection between the first pole 16 and the second pole 17 can be performed easily and in a short time, and the lengths of the first and second poles 16 and 17 can be adjusted. Can be done easily and in a short time.

  Furthermore, when cutting a high branch using the high branch cutting tool 15 shown in FIG. 4, the first and second poles 16 and 17 are expanded and contracted so as to have an appropriate length for cutting the high branch, One of the two first engagement protrusions 26 is engaged with the first engagement hole 25. In this way, the high branch cutter 15 can be adjusted to a desired length and used. Further, the first pole 16 (or the second pole 17) can be added to the second pole 17 (or the first pole 16) for use.

  Further, as shown in FIGS. 1, 3, and 4, the high branch cutter 15 is provided with a pole locking mechanism 22. The pole locking mechanism 22 is configured to rattle the second pole 17 with respect to the first pole 16 in a state in which the first pole 16 and the second pole 17 are stretched or connected to each other and adjusted to a desired length. It can be fixed so that there is no.

  In this way, when the backlash between the first pole 16 and the second pole 17 can be eliminated, the sickle saw 18 provided at the tip of the second pole 17 is accurately and stably attached to the high branch. Since it can be applied, it is possible to facilitate the cutting work of the high branches, and the workability of the cutting work can be improved.

  The pole locking mechanism 22 is fixed to the outer peripheral surface of the tip of the first pole 16 as shown in FIGS. 3A and 3B, and is in close contact with the outer peripheral surface of the first pole 16. The grip part 43 provided is provided. The gripping portion 43 is a short cylindrical body having a substantially elliptical cross section, and a lever 44 is provided at the upper end portion so as to be swingable about the shaft portion 45. Both ends of the shaft 45 are supported by bearings 46. A base end portion connected to the shaft portion 45 of the lever 44 is formed by a cam-like portion 47, and a pressing portion 48 is provided between the cam-like portion 47 and the peripheral wall of the first pole 16.

  According to the pole locking mechanism 22 configured as described above, when the lever 44 is swung to the release position, as shown in FIG. The force that presses the outer surface of the pole 16 is released, and the second pole 17 can be moved in the telescopic direction with respect to the first pole 16.

  As shown in FIG. 3B, when the lever 44 is swung to the locked position, the pressing portion 48 can press the outer surface of the first pole 16 by the action of the cam-like portion 47. As a result, the two apexes 16a, 16a in the major axis direction of the peripheral wall of the first pole 16 are in a state of strongly sandwiching the two apexes 17a, 17a in the major axis direction of the peripheral wall of the second pole 17, and the second pole 17 is It can be strongly bonded to one pole 16.

  However, in the above embodiment, as shown in FIG. 4, an example in which the pole connection structure 14 is applied to the high-branch sickle saw 18 is shown. It can be applied to pruning shears.

  And in the said embodiment, as shown in FIG. 4, although this high branch cutting tool 15 was made into the two-stage type provided with the 1st pole 16 and the 2nd pole 17, it is also possible to make it other than this multiple stage type. Good. For example, in the case of a three-stage system, the pole connection structure 14 provided for the first pole 16 and the second pole 17 may be provided for the second pole 17 and the third pole.

  As described above, the pole connection structure according to the present invention and the high branch cutting tool having the same maintain the function of securely locking the second pole to the predetermined insertion position with respect to the first pole over a long period of time. By being able to do it, it has the outstanding effect which can perform the cutting operation of a high branch efficiently, and is suitable for applying to such a pole connection structure and a high branch cutting tool provided with the same.

14 Pole Connection Structure 15 High Branch Cutting Tool 16 First Pole 16a Top 17 Second Pole 17a Top 18 Saw with Sickle 18a Saw 18b Tip Sickle 18c Base Sickle 19 Mounting Portion 20, 21 Bolt 22 Pole Locking Mechanism 23 1st connection main-body part 24 2nd connection main-body part 25 1st engagement hole 26 1st engagement convex part 26a Hook-shaped part 27 Insertion hole 28 1st biasing means 28a Bend end part 28b Base end part 29 Holder 30 2nd Biasing means 31 2nd engagement convex part 32 2nd engagement hole 33 1st division body 34 2nd division body 35 Mounting hole 36 Retaining hole 37 Retaining pin 38 Insertion hole 39 Elastic part 40 for diameter expansion For diameter expansion Hole 41 Countersunk Screw (Male Screw)
41a Head 42 Semi-cylindrical part 43 Gripping part 44 Lever 45 Shaft part 46 Bearing part 47 Cam-like part 48 Pressing part

Claims (10)

With the second pole inserted into the first pole, the second pole is locked at a predetermined insertion position with respect to the first pole, and the first pole and the second pole are connected to each other. In the pole connection structure
A first engagement convex portion provided so as to be movable back and forth between a protruding position protruding outside the second pole and a pushing position pushed into the first pole;
A first engagement hole provided in the first pole and engaged with the first engagement convex portion at the protruding position;
A first urging means provided with the first engaging convex portion, and urging the first engaging convex portion from the pushing position side toward the protruding position side;
A pole connection structure comprising: a holder fixedly mounted in the second pole and provided with the first urging means.   The pole connection structure according to claim 1, wherein the first urging means is an elastic support portion provided in the holder, and is inserted into the holder and is prevented from being detached by a retaining pin. . A second engagement hole provided in the second pole;
A second engagement convex portion engageable with the second engagement hole; provided on the holder; and provided with the second engagement convex portion, wherein the second engagement convex portion is provided with the second engagement convex portion. The pole connection structure according to claim 1, further comprising second urging means for urging in a direction toward the hole. The second urging means is an elastic support provided in the holder;
4. The pole connection structure according to claim 3, wherein the holder, the second urging means, and the second engaging convex portion are integrally formed.   The said holder has an elastic part for diameter expansion, The outer surface of the said holder presses the inner surface of the said 2nd pole with the elastic force of this elastic part for diameter expansion, Any one of Claim 1 thru | or 4 characterized by the above-mentioned. The connection structure of the pole described in Crab. The holder has a divided body divided into two parts,
6. The pole connecting structure according to claim 5, wherein the two divided bodies are connected to each other via the diameter-expanding elastic portion. A hole for expanding the diameter is provided between the two divided bodies,
7. The pole according to claim 6, wherein the diameter expanding hole portion is divided into two semi-cylindrical portions at least at the inlet side portion into which the male screw is screwed, facing or coupled to the respective divided bodies. Connection structure.   The pole connection structure according to any one of claims 1 to 7, wherein the first pole and the second pole are cylindrical bodies having a substantially elliptical cross section.   A high branch cutter comprising the pole connection structure according to claim 1, wherein a cutting tool is provided at a tip of the pole.   The high branch cutting tool according to claim 9, further comprising a pole locking mechanism capable of fixing the first pole and the second pole to a desired length in a state where the first pole and the second pole are adjusted to a desired length.

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