JPS638196Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety stopper for safety in order to prevent the drive shears from being accidentally driven in a power pruner that utilizes air pressure. Another object of the present invention is to easily release the scissors even if a pruning tree or the like gets stuck between the fixed shears and the driving shears.

Traditionally, pruning is done using pruning shears, but in farms and orchards, there are many trees to be pruned, and doing it by hand is inefficient and tiring.
It has the disadvantage of being susceptible to safety fires. Furthermore, depending on the type of tree to be pruned, the pruned cross section may need to be a smooth surface. In this case, it is necessary to prune the tree with a sharp knife and forcefully at once, but there is a limit to how much it can be done by hand.

The present invention has been made in view of this point.

The power pruner of the present invention uses air pressure as a power source, and the size, shape, etc. of the pruner are determined so that it can be operated with one hand. A valve mechanism 2 is provided in the grip portion 1a, and a valve lever 2a is provided for opening and closing the valve with fingers from the outside. It has become like there is nothing to do.

In addition, a piston 3 is fitted into the main body 1 so as to be slidable in the longitudinal direction of the main body, and a drive provided at the main body distal end is moved by moving the tip inclined surface 3a of the piston 3 back and forth (returning is performed by a built-in spring). It allows the scissors to move.

Fixed scissors 4 having concavely curved blades are fixed to the tip of the main body 1 so as to protrude from the tip of the main body, and the driving scissors 6 are freely movable via a shaft 5 provided on a part of the fixed scissors 4. and attach it to the pivot point. The blade portion of the drive shears 6 is curved in a convex shape, making it suitable for pruning with both scissors, and the rear end 6 of the drive shears 6.
A is made longer and positioned inside the main body so that the rear end 6a comes into contact with the piston inclined surface 3a. Further, a spring 7 is applied to the driving scissors 6 so that the space between the two scissors opens when not pressed by the piston, and when the driving scissors are closed, the rear end 6a is slightly outward from the outer surface of the main body 1. It is made to protrude and a safety stopper 8 is applied using the rear end 6a which protrudes to the outside.

The safety stopper 8 is formed by bending an elastic wire. Both ends of the safety stopper are fitted and locked in small holes drilled in a part of the main body 1 near where the rear end 6a protrudes outward, and the stopper can be tilted freely. As shown in detail in Fig. 2, both ends of the stopper 8 are horizontal locking parts 8a that are opposed to each other and fitted and locked in holes in the main body 1. The horizontal locking parts are bent at approximately 90 degrees from the horizontal locking parts 8a and further bent into a U-shape to form protrusions 8b. The protrusions 8b are connected to both ends of the wire, i.e., to both opposing horizontal locking parts, and are made to face each other and the amount of protrusion is greater than the height at which the rear end 6a of the driving scissors protrudes outward from the main body. A horizontal connecting rod part 8c is provided between the two protrusions 8b.
The connecting rod 8c is engaged with the protruding portion of the rear end 6a of the driving scissors and serves as a stopper. When the stopper is engaged, even though the rear end 6a protrudes outward from the body, both sides and the top are covered by the opposing protrusions 8b, 8b of the safety stopper, so that the safety stopper cannot be released accidentally. When the safety stopper 8 is to be released, the protrusions 8b, 8b of the stopper are pushed inward from both sides, i.e., moved closer to each other, by strongly pushing the protrusions 8b, 8b with the fingers, so that the connecting rod 8c is temporarily bent and the rear end 6a is released from the engagement, and the driving scissors 6 operates so that the space between the two scissors is automatically opened by the spring biased against it.

When pruning, operate the valve lever 2a to move the piston forward using air pressure, press the rear end of the driving shears with the sloped surface of the piston, and close the space between the two shears in a very short time to achieve the desired pruning. When the air supply is stopped, that is, the valve lever is returned to its original position, the piston automatically returns to its original position due to the built-in spring, and the driving scissors return to their original open state due to the spring. This operation is repeated to perform pruning, and the diameter of the tree branch to be pruned is determined by the shape of both shears, that is, the distance between the two open shears. Also, if a branch or the like gets caught between the fixed shears and the driving shears during pruning and the driving shears cannot move, the jammed state can be easily released by hitting the rear end of the driving shears, which is slightly protruding from the main body. be able to.

According to the present invention, since pruning can be performed using air pressure, the work can be done more easily and quickly than conventional manual methods, and the pruning surface can be made smooth, and the drive shears are equipped with a safety stopper. Since the scissors can be locked using the rear end protrusion, safety is improved when not in use, and even if a branch or the like gets caught between the scissors, the rear end protrusion of the drive scissors can be prevented. It has the advantage that the biting can be easily released by tapping the part lightly.

[Brief explanation of the drawing]

FIG. 1A is a longitudinal sectional view, FIG. 1B is an explanatory diagram of the operation of the safety stopper, and FIG. 2 is an external view of the safety stopper. 1... Body, 2... Valve mechanism, 3... Piston, 3a... Inclined surface, 4... Fixed scissors, 5... Shaft,
6... Drive scissors, 6a... Rear end, 7... Spring, 8
...Safety stopper.

Claims (1)

[Scope of utility model registration request] A power pruner that uses a built-in air piston to drive the driving shears protruding from the tip of the one-handed main body, which works in conjunction with the fixed shears opposite to perform pruning work. A power pruning device in which the rear end of the driving shears is made to slightly protrude outside the main body when both shears are closed, and a safety stopper provided on the main body is engaged at the protruding position of the rear end. Safety stopper.