JPH02283215A - High-branch shears - Google Patents

Abstract

PURPOSE:To improve operating efficiency in mounting, demounting and connecting by rotating one of supporting pipes and also a holder or sleeve in a mounting, demounting and connecting part of both rods, mounting, demounting and connecting both the rods through balls. CONSTITUTION:One of supporting pipes 2 and 4 is rotated for mounting, demounting and connecting both the supporting pipes to also rotate a holder 31 or sleeve 35 in a mounting, demounting and connecting part of both rods 3 and 5. Thereby, the mounting, demounting and connecting of both the rods through balls 32 are carried out. As a result, mounting demounting and connecting of the supporting members and driving power transmitting members can be performed by simple operation.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a pair of high-branch scissors in which the scissors are provided at a location separated from the operating section via a support member.

[Conventional technology]

Tall branch shears are used to prune branches at high places by operating an operating section provided at one end of the support member to remotely control the shears provided at the other end of the support member. In order to support and drive the scissors, the scissors and the operating section must be connected not only by a support member but also by a driving force transmission member. Therefore, in order to make it possible to divide the high branch scissors into multiple parts for convenient storage and length adjustment, it is necessary to make it possible to divide not only the above-mentioned support member but also the driving force transmission member. Must-have. For this purpose, as shown in Japanese Utility Model Publication No. 60-10371 and Japanese Utility Model Application Publication No. 60-153950, it is desirable to be able to attach and detach the driving force transmitting member at the same time as the attachment and detachment of the support member. , which is preferable in terms of operability.

[Problem to be solved by the invention]

However, in the former publication, the attachment/detachment of the support member and the attachment/detachment of the driving force transmission member cannot be performed in a single operation; It is also necessary to connect and disconnect the driving force transmission member, and the operability is poor. On the other hand, the device disclosed in the latter publication has extremely good operability since the driving force transmitting member is also connected and connected when the support member is connected and disconnected. However, the structure for attaching and detaching the driving force transmission member here uses an engagement structure that utilizes holes drilled in the sheet metal member, so the strength against tensile force during driving force transmission is weak, and it is difficult to resist repeated forces. If it gets wet, there is a risk of damage. The present invention has been made in view of these points, and its purpose is to provide a pair of high-branch scissors that have good operability in attachment and detachment, high strength, and improved durability.

[Means to solve the problem]

Therefore, the present invention includes a first support pipe on the operation side, a second support pipe with scissors attached to the tip, and a driving rod and a driven rod respectively disposed in both support pipes.
In Takabra scissors in which both support pipes and both rods are detachably connected, the attachment and detachment mechanism of both support pipes is such that they can be connected to each other by axial movement and rotation around the axis of the other support pipe relative to one support pipe. The mechanism for connecting and disengaging both rods consists of a ball held by a holder provided on one rod and a ball located on the outer circumferential side of the holder. It consists of a sleeve that presses the balls protruding from the inner and outer peripheral surfaces of the holder inward, and a plug that is installed on the other rod and inserted into the holder. The sleeve has a rotationally engaging part with a support pipe having a wood and rotates together with the support pipe, and the sleeve presses the ball toward the inner circumference of the holder and releases the pressure by relative rotation with the holder. The plug includes a pressing part and a non-pressing part, and is characterized in that the plug is connected to the other rod via the ball by contact with the ball pressed by the holder. [Function] According to the present invention, when one of the support pipes is rotated in order to connect and detach both support vibrators, the holder or sleeve at the attachment and detachment connection portion of both rods also rotates, and the attachment and detachment of both rods is performed via the balls. Connections are also made. [Example] The present invention will be described below in detail based on the illustrated embodiment. The illustrated example of high-branch scissors includes a main body 1 having a built-in power drive means, and two types of long and short support pipes connected to the main body 1. 4.4, and a cutting blade 6 driven by the above-mentioned power drive means is attached to a bracket 40 at the tip of each support pipe 4.4. be used and replaced as appropriate. A support pipe 2 to which a support pipe 4 is freely connected is provided in the main body 1, and a power drive means and the cutting blade 6 are provided in both support pipes 2.4.
Rods 4 and 5 are provided to connect the two. The support pipe 2 inside the main body 1 has an inner diameter into which the end of the support pipe 4 can be inserted, and is formed by cutting and bending inward, as shown in FIGS. 2 and 3. It is provided with a stopper 20 with a closed position, and an L-shaped engagement groove 21 with one end opening at the tip edge. The support pipe 4 has an engagement pin 41 protruding from its outer peripheral surface.
The end of the support vibe 4 is inserted into the support vibe 2 with the engagement pin 41 and the engagement groove 21 aligned, and the support pipe 4 is rotated around the axis relative to the support pipe 2. By rotating the engaging pin 41 to the inner part of the engaging groove 21, the supporting pipes 2 and 4 are connected. At this time, the edge of the supporting pipe 4 is connected to the supporting pipe. It is adapted to come into contact with the stopper 20 of No. 2. A holder 31 is fixed to the end of the drive-side rod 3 disposed within the support vibe 2 with screws 39, and a sleeve 35 is rotatably disposed around the outer periphery of the holder 31. . The holder 31 here is the fourth
As shown in the figure, a plurality of holes 31a are provided with steel balls 32. The sleeve 35 has an annular groove 31b into which the stop ring 33 is attached, and the sleeve 35 is slidable in the axial direction with respect to the holder 31, and is restricted by the stop ring 33 by a spring 34 disposed between the sleeve 35 and the rod 3. It is energized to the position where it is. And, at the tip of the sleeve 35,
As shown in FIG. 5, a plurality of engagement grooves 36, 36 are formed, and a plurality of protrusions 35a and grooves 35b are alternately provided on the inner peripheral surface of the sleeve 35 in the circumferential direction. It is being On the other hand, the driven-side rod 5 disposed within the support vibe 4 is
It is positioned at the center of the support vibe 5 by a disc-shaped holder 50, one end of which is connected to the cutting blade 6, and a plug 52 fixed to the other end. As shown in FIG. 6, this plug 52 is provided with an annular spring 53 on its outer peripheral surface. However, in this Takabra scissors, the support pipe 4 is attached to the main body 1.
To attach it, all you have to do is insert one end of the support pipe 4 into the support vibe 2 on the main body 1 side and rotate it. At this time, the rod 3 on the driving side and the rod 5 on the driven side are connected at the same time. It has become. That is, when the support pipe 4 is not connected, the sleeve 35 has its groove 35 as shown in FIG. 7(b).
Since the part b is located on the outer circumferential side of the ball 32, the ball 32 can be moved to the outer circumferential side.
When inserting the plug 52 of the driven rod 5, the plug 52 of the driven rod 5 is inserted into the holder 31 while pushing the ball 32 toward the outer circumference of the holder 31. When the engagement pin 41 of the support pipe 4 enters the engagement groove 21 of the support pipe 2, the engagement piece 42 cut and raised inward from the support pipe 4 moves into the sleeve 3.
5 into the engagement groove 36 at the tip. After that, if the engagement pin 41 is engaged with the inner part of the engagement groove 21 by rotating the support pipe 4 with respect to the support pipe 2, the engagement with the engagement piece 42 of the support pipe 4 is prevented. Therefore, the sleeve 35 rotates together with the support pipe 4, and the protrusion 3
In order to position the portion 5a on the outer periphery of the ball 32, the ball 32 is pressed inward into the holder 31 and engaged with the engagement groove 53 of the plug 52, and both rods 3 and 5 are connected to each other. . In this state, if the drive means is operated by operating the operation part (not shown) provided on the main body 1, the drive means pulls the drive side rod 3 and moves through the driven side rod 5. A reaction force during cutting by the cutting blade 6 that moves the cutting blade 6 is received by a stopper 20 provided on the support pipe 2. To remove the support pipe 4 from the main body 1, it is sufficient to rotate the support pipe 4 relative to the support pipe 2 and then pull it out in the axial direction.The sleeve 35, which rotates at the same time as the above rotation,
In order to position the groove 35b on the outer periphery of the ball 32, the plug 52 of the driven rod 5 is pulled out while pushing the ball 32 toward the outer periphery of the holder 31, and supports the support pipe 4. When pulling out from the pipe 2, both rods 3 and 5 are also disconnected at the same time. In addition, since attachment and detachment are performed by rotating the support pipe 4 around its axis, a collet chuck type locking means 7 is used here to prevent the support pipe 4 from being rotated inadvertently.
is provided in the main body 1. This locking means 7 is shown in FIGS.
As shown in FIG. 11, it consists of a cylindrical part having a split groove 15 provided in the two-split casing 10 of the main body 1, and a lock ring 70 rotatably disposed around the outer periphery of this partition. A groove 16 whose depth gradually changes is provided on the outer peripheral surface of the lock ring 70, and a protrusion 71 is provided on the inner peripheral surface of the lock ring 70. In the lock ring 70, the protrusion 71 is inserted into the groove 15 through the tapered introduction part 18 between the deeper end of the groove 16 and the edge of the cylindrical part. When the protrusion 71 is rotated and moved to a shallower depth in the spring 16, the cylindrical part is pushed inward by the protrusion 71 and tightens the outer circumference of the support pipe 4, causing the rotation of the support pipe 4. Reference numeral 72 in the figure is a click protrusion provided on the protrusion 71, which engages with the click latch 17 provided at one shallow end of the groove 16, thereby locking the lock ring 70. Give a click to the rotation of. Another embodiment is shown in FIG. 12 and below. Here, as a member for holding the rod 5 in the support pipe 4 at the center, a member having an engaging protrusion 56 on the negative side is fixed by the caulking part 45 of the support pipe 4. A holder 55 is used, and the sleeve 35 is fixed to the rod 3 on the driving side in the support pipe 2 via a screw 39 and a cylinder 37, and the holder 31 holding the ball 32 is fixed in the axial direction. It is made to be able to freely slide and rotate around an axis, and is further biased in the axial direction by a spring 34. The inner surface of the sleeve 35 has a tapered surface 35d whose inner diameter becomes smaller at the tip end, and an engagement groove 35e is provided at the end edge on the rod 3 side. Further, the holder 31 is provided with an engagement groove 31c at its leading edge and a projecting piece 31d projecting in the outer circumferential direction at the other end. In this case, when both support pipes 2.4 are not connected, the holder 31 is moved back against the spring 34, and its projection 31d is in a state of being locked to the edge of the sleeve 35. For this purpose, the ball 32 is located at a portion of the sleeve 31 that has a large inner diameter. Now, insert the support pipe 4 into the support pipe 2 so that the engagement pin 41 of the support pipe 4 enters the engagement groove 21 of the support pipe 2.
When the end of the holder 31 is inserted, the engagement groove 3Lc at the tip of the holder 31
When the holder 31 engages with the engagement protrusion 56 of the holder 55 and rotates the support pipe 4 with respect to the support pipe 2, the holder 31 also rotates at the same time and its protrusion 31d matches the engagement groove 35e of the sleeve 35. As a result, the holder 31 moves under the force of the spring 34 and positions the ball 32 held therein at the small inner diameter of the sleeve 35. The ball 32 bites between the inner surface of the sleeve 35 and the outer peripheral surface of the plug 52, and therefore, as in the previous embodiment, both the support pipes 2.4 and the rods 3.5 can be connected at the same time. It is what is done. If the drive means is operated to pull the rod 3 in this connected state, the ball 32 will further bite between the sleeve 35 and the plug 52, so this force will surely be applied to the rod 5. The signal is transmitted to drive the cutting blade 6. When the rod 3 returns, the screw 3 provided on the rod 3
Since the tip of the rod 9 presses the plug 52, the state in which the rods 3 and 5 are connected by the ball 32 is not disturbed. The connection between both rods 3 and 5 is also released at the same time as the connection between both support pipes 2 and 4 is released. That is, if the support pipe 4 is rotated in the opposite direction with respect to the support pipe 2, the holder 31 rotating together with the support pipe 4 will have its projection 31d aligned with the engagement groove 3 of the sleeve 35.
The ball 32 is guided by the inclined edge 35f on one side of the sleeve 5e and retreats against the spring 34, and finally the protruding piece 31d rides on the rear end edge of the sleeve 35, and the ball 32
is located at a portion of the sleeve 35 where the inner diameter is large. For this reason, the wedge effect caused by the ball 32 biting in between the sleeve 35 and the plug 52 is eliminated, and when the support pipe 4 is pulled out from the support pipe 2, the plug 52 can also be pulled out from the sleeve 35 and the holder 31 without resistance. It is something that is served. Effect 1 of the invention As described above, in the present invention, when one support pipe is rotated to connect and disconnect both support vias, the holder or sleeve at the connection part of both woods also rotates, and the ball Since the two rods can be attached and detached, there is no need to perform the two types of attachment and detachment operations individually, and the operability is good. Because it uses balls, it has high strength and is durable.

[Brief explanation of drawings]

Fig. 1 is a perspective view of one embodiment of the present invention, Fig. 2 is a sectional view of the same, Fig. 3 is a perspective view of the support pipe of the above, Fig. 4 is a perspective view of the holder of the above, and Fig. 5 (a )(b) is a front view and a perspective view of the sleeve as above, FIG. 6 is a perspective view of the plug as above, FIGS. 7(a) and (b) are partial sectional views as above, and FIG. 8 is a locking means as above. 9 is a perspective view of the cylindrical portion of the same as above, FIGS. 10(a) and 10(b) are partial cross-sectional views of the same as above, and FIGS. ), FIG. 12 is a sectional view of another embodiment, FIG. 13 is a perspective view of the same support pipe, and FIG. The figures are an exploded perspective view of the same as the above, Fig. 15 is a cutaway side view of the sleeve and the cylinder body of the above, Fig. 16 is a perspective view of the sleeve of the above, and Fig. 17 is a partial cross-sectional view of the same as the above. 1 is the main body, 2.4 is a support pipe, 3 and 5 are rods, 31
32 is a ball, and 35 is a sleeve. Agent Patent Attorney Ishi 1) Long 7-+ ('l (P, ■(r+, 7r*Figure 8 Figure 9 Figure 12 (b) Figure 10 Figure 11

Claims (1)

[Claims] (1) A first support pipe on the operating side, a second support pipe with scissors attached to the tip, and a driving rod and a driven rod arranged inside both support pipes, so that both support pipes are connected to each other. In a pair of high branch scissors in which both rods are detachably connected, the attachment and detachment mechanism of both support pipes engages each other by moving the other support pipe in the axial direction with respect to the other support pipe and rotating around the axis. The attachment/detachment mechanism for both rods consists of a ball held by a holder provided on one rod, and a ball held on the outer circumference of the holder. a sleeve that presses the balls protruding from the inner and outer circumferential surfaces toward the inner circumference;
a plug provided on the other rod and inserted into the holder, and either the sleeve or the holder is provided with a rotating engagement part with the support pipe provided with the other rod and rotates together with the support pipe. taken as a thing,
The sleeve has a pressing part and a non-pressing part that press the ball toward the inner circumference of the holder and release the pressure by relative rotation with the holder, and the plug contacts the ball that is pressed by the holder. A pair of high branch scissors characterized in that the scissors are connected to the other rod via a ball.