JPH0531864Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to an outer tube attachment device for a backpack-type brush cutter, and more particularly to an outer tube attachment device that accommodates an engine control wire that can follow the curved deformation of a flexible tube.

[Conventional technology]

A backpack-type brush cutter has an engine, which is a power source, mounted on the backpack frame, and its output is configured to drive the cutting blade attached to the tip of the main operating rod. A flexible transmission shaft is connected to the power transmission shaft inside the rod, and this flexible transmission shaft is inserted and housed in a flexible tube. A throttle lever for controlling the output of the engine is installed near the handle of the main operating rod, which is in the operator's hand.
It is connected to the engine throttle with a throttle wire, allowing the engine output to be adjusted remotely. This throttle wire is inserted through the outer tube, and is fixed at several points with rings or the like so that it can always be deformed integrally with the flexible tube.

[Problem that the idea aims to solve]

In the above-mentioned backpack-type brush cutter, when the mowing blade is swung from side to side during the mowing process, the flexible tube is repeatedly deformed by increasing and decreasing the degree of curvature. As the ring, which allows the flexible tube to deform repeatedly, repeats its curved deformation, it gradually moves toward the center of the flexible tube, and the outer tube and flexible tube go from being integral to being deformed separately. As a result, it sometimes became a nuisance in the hands of workers. Additionally, in severe cases, the deformation of the outer tube may not be able to follow the deformation of the flexible tube, and the throttle wire housed within the outer tube may be pulled or pushed, making it impossible to control the engine output. . Therefore, this invention is intended to enable the deformation of the outer tube to effectively follow the deformation of the flexible tube so as not to interfere with the work.

[Means to solve the problem]

Therefore, in order to achieve the above-mentioned purpose, this invention includes a corrugated outer tube that accommodates the engine control wire along the flexible tube that accommodates the flexible transmission shaft, and a corrugated outer tube that is fitted into the flexible tube. , a tube holder having an outer tube insertion ring portion, the inner surface of the outer tube insertion ring portion of the tube holder having a protrusion that engages with the corrugate of the outer tube,
It is characterized in that the protrusion engages with the corrugate to suppress movement of the tube holder.

【Example】

Embodiments of this invention will be described below with reference to the attached drawings. In these figures, reference numeral 1 indicates an engine mounted on a backpack frame 2, and a flexible tube 4 is connected between the output shaft of the engine 1 and a transmission shaft inserted along the axis of the main operating rod 3. They are connected by a flexible transmission shaft housed in the Then, the handle 5 attached to the main operating rod 3
A throttle lever 6 is installed near the engine 1, and the throttle lever 6 and the throttle of the engine 1 are connected by a throttle wire serving as an engine control wire, and this throttle wire is inserted into an outer tube 7.
A corrugated tube is used as the outer tube 7, and is designed to be deformable in the same way as the flexible tube 4. The tube holder 1 is arranged so that the outer tube 7 can be deformed integrally with the flexible tube 4.
0 is used. The tube holder 10 is a flexible tube 4
The insertion ring part 11 has a slightly larger diameter in order to pass through the outer tube 7, and the insertion ring part 1 has an inner diameter slightly larger than this in order to pass through the outer tube 7.
2, and has an 8-type shape when viewed from the front, and a protrusion 12A that can be engaged with the groove 7A of the outer tube 7 of the corrugated tube is provided on the inner surface of the insertion ring portion 12. It is preferable to provide two of these protrusions 12A facing each other on the inner surface of the ring insertion ring part 12, but the number of protrusions 12A is determined by the function of fitting into the concave groove 7A of the corrugate, or by sandwiching the convex part between the concave grooves from both sides. All you have to do is have it. Two or three tube holders 10 are used along the length of the flexible tube 4. The flexible tube 4 is inserted into the insertion ring portion 11, and an outer tube, which is a corrugated tube, is inserted into the insertion ring portion 12. 7 are respectively inserted, and the protrusion 12A of the insertion ring portion 12 is fitted into the groove 7A of the outer tube 7. Therefore, the insertion ring portion 11 and the flexible tube 4 are in a free state along both the rotation direction and the length direction, but the insertion ring portion 1
2 is the protrusion 1 in relation to the outer tube 7.
Movement in the length direction is suppressed by mutual restraint between the groove 2A and the groove 7A. Further, the tube holder 10 is allowed to rotate around the outer tube 7,
The outer tube 7 can follow the deformation of the flexible tube 4 during mowing work. In the above description, the shape of the insertion ring portion 12 is shown to be closed, but since it is preferable that the insertion ring portion 12 elastically hold the outer tube 7, a slit is formed in a part of the circular shape. 12B is provided at a location corresponding to the bottom, or
A protrusion 12A may be formed along the circumferential surface, thereby making it possible to easily attach and detach the outer tube using the slit 12B.

[Effect of the idea]

As is clear from the above description, the outer tube attachment device for the backpack-type brush cutter of this invention inserts the engine control wire into the outer tube of the corrugated tube, and also attaches the outer tube to the flexible tube by placing the outer tube along the flexible tube. Since the tube holder is constructed with an insertion ring portion through which the tube holder is inserted, and a projection having an inner surface that suppresses movement of the tube holder in the longitudinal direction, the following effects can be obtained. (a) Since the tube holder does not move in the longitudinal direction of the flexible tube, it is prevented from moving toward the center during mowing work, and the outer tube is not substantially released. (b) Since the flexible tube is allowed to move relative to the tube holder both in the rotational direction and in the longitudinal direction, deformation of the flexible tube does not interfere with the mowing operation. (c) The outer tube and the flexible tube can always be deformed in unison.

[Brief explanation of the drawing]

Fig. 1 is an overall slope view of the backpack-type brush cutter, Fig. 2 is an enlarged slope view of the part in Fig. 1, Fig. 3 is a front view of the tube holder, Fig. 4 is an enlarged sectional view along the line shown in Fig. 3, FIG. 5 is a front view of a tube holder according to another embodiment, FIG. 6 is a sectional view taken along the line of FIG. 5, and FIG. 7 is an enlarged sectional view of the portion shown in FIG. 6. 1... Engine, 3... Main operating rod, 4... Flexible tube, 7... Outer tube, 7
A... Concave groove, 10... Tube holder, 11...
Insertion ring part, 12... Insertion ring part, 12A...
…protrusion.

Claims (1)

[Scope of Claim for Utility Model Registration] The product is equipped with an engine mounted on a backpack frame and a main operating lever to which a cutting blade is attached, and the output shaft of the engine and the power transmission shaft of the main operating lever are connected by a flexible transmission shaft. In the constructed backpack-type brush cutter, there is a corrugated outer tube that is placed along the flexible tube that accommodates the flexible transmission shaft and that accommodates the engine control wire, and a corrugated outer tube that is fitted into the flexible tube and that is inserted through the outer tube. a tube holder having a ring portion, a protrusion that engages with the corrugation of the outer tube is formed on the inner surface of the insertion ring portion of the outer tube of the tube holder, and the protrusion engages with the corrugation to prevent movement of the tube holder. Outer tube mounting device characterized by suppressing the outer tube.