JPH09322650A - Pruning implement for tree - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pruning implement requiring no large force in pruning a tree therewith. SOLUTION: This pruning implement A is made up of a sliding cylinder 2 slidably sheathed on the upper part of an operating lever and a cutting mechanism B set up on the tip of the sliding cylinder 2. In this case, the cutting mechanism B is equipped with a base plate 13 with a downwardly fixed edge 36 on its horizontal piece 3a, a revolving plate 5 axially attached to the base plate 3 and subject to revolution as the operating lever 1 is pulled down and a swing plate 14 subject to swinging motion via a mediatory piece 6 axially attached to an eccentric shaft 5b provided on the revolving plate 5, and the swing plate 4 is fitted with a movable edge 4a to be engaged with/disengaged from the fixed edge 3b as the edge 4a swings; therefore, cutting force increases as compared to the pull-down force in making a cutting operation owing to so-called crank mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a branch cutting tool for cutting branches of upright trees such as cedar and Japanese cypress.

[0002]

2. Description of the Related Art A long-handled sickle-shaped branch cutting tool.

[0003]

The branch cutting tool in the above-mentioned prior art is to cut a branch by hooking a sickle-shaped blade on a tree branch and rapidly and repeatedly pulling down the long handle. It requires heavy power and is considered to be heavy labor work.

An object of the present invention is to provide a branch cutting tool that solves the above problems.

[0005]

A tree branch cutting tool that achieves the above object is composed of a sliding cylinder slidably mounted on the upper portion of an operating rod and a cutting mechanism disposed at the tip of the sliding cylinder. The cutting mechanism is provided with a base plate provided with a downward fixed blade on a horizontal piece, a rotary plate pivotally mounted on the base plate and rotating with the pulling down movement of the operating rod, and the rotary plate. In addition, a swing plate that swings via an intermediary piece axially attached to the eccentric shaft is provided, and further, the swing plate is provided with a movable blade that engages and disengages with the fixed blade in response to swing. .

[0006]

EFFECTS OF THE INVENTION The tree branch cutting tool according to the present invention pulls down the operating rod to move the cutting blade through the intermediary piece and the oscillating plate axially mounted at a position eccentric from the rotation center of the rotating plate. When the eccentric shaft is moved by the crank mechanism, in other words, as the eccentric shaft is moved by the crank mechanism, the cutting force is increased as compared with the pulling down force. Therefore, the cutting work becomes light labor and the workability is excellent.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a tree branch cutting tool according to the present invention. FIG. 1 is a general view at the time of cutting, FIG. 2 is a front view of a cutting mechanism, and FIG. It will be explained based on.

Reference numeral A in the drawing denotes a branch cutting tool, which is the operating rod 1 and a sliding cylinder 2 provided on the upper portion of the operating rod 1.
And a cutting mechanism B arranged at the tip of the sliding cylinder 2,
The operating rod 1 is in the shape of a rectangular rod, and the sliding barrel 2 is mounted on the upper portion of the operating rod 1 via an elastic stopper 1a so as to be able to move up and down.
The cutting mechanism B includes a base plate 3 protruding upward from the tip of the sliding barrel 2, a swing plate 4 and a rotary plate 5 having a circular shape. The base plate 3 has an upper horizontal piece 3a and a fixed blade 3b facing downward. And a movable portion 4a facing upwardly with the central portion of the swing plate 4 by a shaft 4b and facing the fixed blade 3b at one end.
Further, the rotating plate 5 is attached to the lower part of the swinging plate 4, and the eccentric shaft 5 is located at a position eccentric from the shaft 5a of the rotating plate 5.
b, one end of the intermediary piece 6 is pivotally attached, the other end is pivotally attached to the other end of the rocking plate 4 to interpose the intermediary piece 6, and a peripheral portion of the rotary plate 5 is provided. In the groove 5c, a chain 7 having one end fixed to the rotating plate 5 with a screw 7a is suspended, and the other end is fixed to a stopper 1b fixed to the upper end of the operating rod 1.
One end of the wire 8 is attached to the screw 7a, and the other end thereof is introduced into the operating rod 1 through a guide groove roller 9 axially attached to the lower part of the rotating plate 5 and is introduced into the operating rod 1. The fixed blade 3b is fixed and tensioned to the compressed spring 10.
The eccentric shaft 5b of the intermediary piece 6 is located near the top dead center of the rotating plate 5 which rotates about the shaft 5a in a state where the movable blade 4a is separated, and is located near the bottom dead center in the occlusal state. In addition, the screw 7a of the chain 7 also serves as an occlusal limit stopper for the fixed blade 3b and the movable blade 4a, reference numeral 11 denotes the same separation limit stopper, and 12 denotes a tree branch.

The chain 7 and the wire 8 are not limited to this, and the rotating plate 5 is not limited to a circular shape.

The branch cutting tool A in the embodiment has the above-mentioned construction, and the downward fixed blade 3b provided on the horizontal piece 3a of the substrate 3 is hooked on the branch 12 of the tree to be cut ( By lowering the operating rod 1 downwards in Fig. 2), the chain 7 is pulled down via the stopper 1b provided on the upper end of the operating rod 1, and the chain 7 is suspended and the other end is screwed. The rotating plate 5 fixed by 7a is the shaft 5a.
As the eccentric shaft 5b of the intermediary piece 6 shifts from the top dead center to the bottom dead center with the rotation of the rotary plate, the rocking plate 4 moves through the intermediary piece 6 and the oscillating plate 4 rotates. The movable blade 4a and the fixed blade 3b engage with each other to cut the branch 12, and at this time, the screw 7a to which the chain 7 is fastened
The head contacts the side surface of the intermediary piece 6 and acts as an occlusal limit stopper, and the wire 8 bound to the screw 7a is pulled along the circumferential groove 5c of the rotating plate 5 and the other end of the wire 8 is pulled. The spring 10, which has been fastened, extends against the bias (FIG. 1).

After the branch 12 is cut, the branch on which the fixed blade 3b is hooked disappears, so that the rotating plate 5 is reversed through the wire 8 and the chain 7 due to the contraction and urging force of the spring 10, and the intermediate piece 6 is further attached. The oscillating plate 4 is rotated through the movable blade 4a and the fixed blade 3b so that the movable blade 4a and the fixed blade 3b are separated from each other.
And the lower end of the sliding cylinder is elastic stopper 1a.
When the wire 8 and the spring 10 are used for returning, a coil spring is installed between the rotating plate 5 and the substrate 3 so as to return to the normal state (FIGS. 2 and 3). Has the same effect.

In the branch cutting tool, by pulling down the operating rod, the cutting blade is bited away via the intermediary piece and the oscillating plate axially mounted at a position eccentric from the center of rotation of the rotating plate. For example, when the crank mechanism shifts from the top dead center to the bottom dead center of the eccentric shaft, the cutting force is increased as compared with the pulling down force. Therefore, the cutting work becomes light labor and the workability is excellent.

[Brief description of drawings]

FIG. 1 is an overall view at the time of cutting.

FIG. 2 is a front view of a cutting mechanism.

FIG. 3 is a side view.

[Explanation of symbols]

 A branch cutting tool B cutting mechanism 1 operating rod 1a elastic stopper 1b stop piece 2 sliding cylinder 3 substrate 3a horizontal piece 3b fixed blade 4 swing plate 4a movable blade 4b shaft 5 rotating plate 5a shaft 5b eccentric shaft 5c circumferential groove 6 Mediation piece 7 Chain 7a Screw 8 Wire 9 Guide groove roller 10 Spring 11 Separation limit stopper 12 Tree branch

Claims (1)

[Claims] 1. A slide cylinder slidably mounted on the upper part of the operating rod, and a cutting mechanism arranged at the tip of the slide cylinder.
The cutting mechanism has a base plate provided with a downward fixed blade on a horizontal piece, a rotary plate pivotally mounted on the base plate and rotated by the pulling down movement of the operating rod, and an eccentricity provided on the rotary plate. A tree branch cutting tool provided with a swing plate that swings via an intermediary piece axially attached to a shaft, and further provided with a movable blade that engages and disengages with the fixed blade in response to swing. .