JPS6010354Y2 - 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 engine unit via a power transmission shaft.

This flexible tube is constantly bent during brush cutting work, and is constantly bent and stretched in response to the swinging operation of the cutting blade, so 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 invention 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. At the same time, a concave groove is formed along the end of the solid tube into which the end of the flexible tube is fitted, and locking springs are equally distributed on the circumferential surface of the solid tube. The flexible tube is characterized by being configured so that the flexible tube is connected to the solid tube by holding it down with a retaining ring attached to the end.

Embodiments of the connecting device according to this invention will be described below with reference to the attached drawings.

First, in Fig. 1, reference numeral 1 denotes a main rod which is a solid tube through which a power transmission shaft is inserted, and has a cutting blade unit 2 at one end and a backpack-type engine unit at the other end via a flexible tube 3. 4 is connected, and the engine output is transmitted to the cutting blade unit by a flexible power transmission shaft inserted into the flexible tube 3.

The following connection device is used for the joint between the solid tube 1 and the flexible tube 3, represented by the main rod.

First, at the end of the flexible tube 3, a charging part 31 is formed with a diameter slightly smaller than the outer diameter of the flexible tube 3, and the charging part 31 is accommodated in a cavity of a locking ring, which will be described later. A concave R31a is formed around the circumference,
Furthermore, a fitting part 31b is formed at the end of the charging part 31, and the fitting part 31b is fitted into the end of the solid tube 1.

A plurality of locking springs 11 are attached to the peripheral surface of the end of the solid tube 1.
1 has an extended locking protrusion 11a, and further forms an enlarged diameter portion 11b expanded in the radial direction.

This locking spring 11 has a tendency to expand in the radial direction of the solid tube 1, and in order to reduce the diameter of the locking spring 11 in the radial direction, a locking ring 5 is provided at the end of the solid tube 1. The locking ring 5 is pushed toward the open end of the solid tube 1 by a push spring 51 whose one end is received by the solid tube 1, and the locking ring 5 hits the stopper 12 formed at the end of the solid tube 1. ing.

One end of the locking ring 5 has a cavity 52 that accommodates the insertion portion 31 of the flexible tube 3, and the locking spring 11 of the solid tube 1 is housed in this cavity space.

Next, the actual connection work using the flexible tube connection device according to this invention will be explained.

First, the locking ring 5 is pushed toward the solid tube 1 against the pressing force of the push spring 51, and the locking protrusion 11a of the locking spring 11 is enlarged in diameter according to its behavior, and is inserted into the insertion portion 31 of the flexible tube 3. The provided fitting part 31b is inserted into the solid tube 1.
The locking ring 5 is moved according to the behavior of the push spring 51 while the locking ring 5 is fitted into the end of the spring 51, the locking spring 11 is accommodated in the cavity 52, and the expanding diameter portion 11b is pushed in the diameter reducing direction to recess the locking protrusion 11a. It is locked in the groove 31a.

This connects the flexible tube 3 to the solid tube 1.

Further, when the flexible tube 3 is to be removed, when the locking ring 5 is moved against the elasticity of the push spring 51, the locking spring 11 expands on its own to release the flexible tube.

Although the main rod has been shown as a solid tube above, a connecting device can be similarly used on the engine unit side.

As is clear from the above description, the flexible tube connecting device of this invention connects the flexible tube to the solid tube by contracting the diameter of the retaining ring provided on the solid tube side with a retaining spring that has a tendency to expand the diameter. Because it is configured to capture the end of the flexible tube,
It is extremely easy to attach and detach.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of the backpack-type brush cutter, and FIG. 2 is an enlarged sectional view of the section ``■'' in FIG. 1. 1... Solid tube, 11... Locking spring, 11a... Locking protrusion, llb...
... Expanded diameter part, 2 ... Cutting blade unit, 3 ...
...Flexible tube, 31...Charging section,
31a... Concave groove, 4... Engine unit, 5... Engagement ring, 51... Push spring, 52... Cavity.

Claims (1)

[Scope of utility model registration request] In a backpack-type mower that 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. Alternatively, the solid tube includes a solid tube such as a main rod and a flexible tube connected to the solid tube, and the solid tube has a plurality of locking springs having a diameter expanding habit on the peripheral surface of the end portion, and the flexible tube There is a locking ring around the end that has a fitting part for locking the locking spring and is attached to cover the end of the solid tube, and this locking ring is attached to the open end of the solid tube. A flexible tube connection characterized in that it has a cavity that has a tendency to move toward the side and can accommodate a locking spring from the outside, and is configured to connect a flexible tube by reducing the diameter of the locking spring with a locking ring. Device.