JPS6010352Y2 - Flexible tube connection device for backpack type brush cutters - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a flexible tube connection device for a backpack type brush cutter, and more specifically, to a connection device for a flexible tube to a main rod or a flexible tube to an engine unit.

A backpack type brush cutter has a cutting blade unit at the tip of the main rod that houses the power transmission shaft, connects a flexible tube to the other end, passes the flexible power transmission shaft through it, and connects the end of the flexible tube to the end of the main rod that houses the power transmission shaft. Connect the part to the solid tube on the engine unit side, and connect the rotational output of the engine unit carried on your back to the flexible power transmission shaft.
The power is transmitted to the cutting blade unit via the power transmission shaft.

This flexible tube is constantly bent during the operation of the cutting blade, and moreover, it is constantly bent and stretched in response to the swing operation of the cutting blade, and both the flexible power transmission shaft and the flexible power transmission shaft often fail due to fatigue.

Furthermore, since the flexible tube increases the packaging volume during packaging, it is necessary to remove the flexible tube from the main rod and engine unit members in order to pack it compactly.

In this way, if the flexible tube can be easily attached and detached from the main rod or other engine unit components, the packaging can be made smaller, and the connecting device of the flexible tube can be replaced, for example, the end that was connected to the main rod can be replaced. By newly connecting it to the engine unit side, partial fatigue of the flexible tube can be prevented as much as possible.

Therefore, this idea aims to make it possible to easily connect and disconnect the main rod and the flexible tube, or the flexible tube and the engine unit side parts. In addition to forming a concave groove along the flexible tube, a pin hole that communicates with the concave groove of the flexible tube is provided in the solid tube into which this flexible tube is fitted, so that the pin that is inserted through this pin hole does not interfere with the outer peripheral surface of the flexible tube. It is characterized by having a notch so that the flexible tube can be attached and detached by selecting the rotational position of the pin.

Hereinafter, an embodiment of this invention will be described with respect to a connecting device between a main rod and a flexible tube.

First, FIG. 1 is an overall side view of a backpack-type brush cutter, in which a cutting blade unit 2 is attached to one end of a main rod 1, and a backpack-type engine unit 4 is attached to the other end of the main rod 1 via a flexible tube 3. It is connected.

A connecting device is constructed between the flexible tube 3 and the solid tube 1, which is the main rod.

That is, a cavity 1a into which the flexible tube 3 is inserted is formed at the end of the solid tube 1, and a pin hole 11 is bored through the solid tube 1 along the connection direction in the peripheral wall of the cavity 1a. Ori,
A groove 31 is formed on the circumferential surface of the flexible tube 3 so as to overlap the inner half of the pin hole 11 when the flexible tube 3 is inserted into the cavity 1a.

A fixing pin 5 is inserted into this pin hole 11, a retaining protrusion 51 is provided at one end, and a ring-shaped locking ring 52 is attached to the other end, and this locking ring 52 is made of a solid tube. It can be elastically locked to a locking protrusion 53 provided at 1.

A notch 54 is formed on the curved surface of the fixing pin 5, which extends along the outer peripheral surface of the flexible tube 3 within the pin hole 11 and does not interfere with the insertion of the flexible tube.

When the locking ring 52 is released, the fixing pin 5 is inserted into the pin hole 11.
It can be rotated freely inside.

Next, the connection between the solid tube 1 and the flexible tube 3 using the connecting device according to this invention will be explained.

First, before inserting the flexible tube 3 into the cavity 1a of the solid tube 1, the pin holes 11 and the grooves 3 are
1 are aligned, the fixing pin 5 is inserted into the pin hole 11, and a retaining protrusion 51 is applied.

After inserting the flexible tube 3 into the cavity 1a with the notch 54 of the fixing pin 5 facing toward the cavity 1a, the fixing pin 5 is rotated in the pin hole 11 so that the notch 54 is directed toward the outer circumference of the solid tube 1. When the flexible tube 3 is oriented, the concave groove 31 of the flexible tube 3 catches the fixing pin 5 and prevents it from being attached or detached.

A locking ring 52 of the fixed pin 5 is locked to a locking protrusion 53 to prevent the fixed pin 5 from rotating.

Although not shown, a power transmission shaft is installed inside the solid tube and flexible tube.

As is clear from the above description, the flexible tube connecting device for the backpack-type brush cutter of this invention connects the flexible tube to the solid tube by inserting one end of the flexible tube into the solid tube.
The fixing pin inserted into the pin hole drilled in the solid tube is passed through the concave groove of the flexible tube, and a notch is provided in the fixing pin to enable attachment and detachment of the flexible tube, so all you need to do is rotate the fixing pin. The flexible tube can be easily attached and detached.

[Brief explanation of the drawing]

Figure 1 is an overall side view of the backpack type brush cutter, Figure 2 is Figure 1
Figure 3 is a cross-sectional view along the curve in Figure 2.
FIG. 4 is a sectional view taken along line IV--IV in FIG. 3, and FIG. 5 is a plan view. 1... Solid tube, 2... Cutting blade unit, 3... Flexible tube, 11
...In hole, 31 ... Concave groove, 5 ...
...Fixing pin, 51... Removal protrusion, 52...
... Rotating ring, 53 ... Locking protrusion, 54 ...
...notch.

Claims (1)

[Scope of utility model registration request] A backpack-type brush cutter has a cutting blade unit at one end of the main rod fitted with a power transmission shaft, a flexible tube is connected to the other end, and the end is connected to the engine unit. In both cases, there is a solid tube into which the end of a flexible tube is fitted, a pin hole is bored in the solid tube parallel to the tangential direction in the cross section, and the flexible tube has a concave groove on the circumferential surface. and a fixing pin inserted through the pin hole, the fixing pin having a rotation locking device at one end,
1. A flexible tube connecting device, characterized in that the device has an arc-shaped notch on its circumferential surface that allows the flexible tube to be inserted therethrough, and is configured to connect the flexible tube to the solid tube by rotating a fixed pin.