JPH0230248Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a safety cover device for a saw blade chain of a portable saw cutting machine such as a chain saw or a branch cutter that drives an endless saw blade chain to cut trees, etc. .

PRIOR TECHNOLOGY Portable saw cutting machines are carried by workers to work sites such as mountains and forests, but for the safety of workers during such transportation, the tip of the exposed chain guide bar of the saw blade chain is The conventional safety cover device is constructed so that it can be removed manually to start work.

Problems that the invention aims to solve Because of this configuration, conventional safety cover devices are troublesome to attach and detach from the machine, leading to the risk of transporting the machine without attaching the safety cover or losing the cover. This caused problems in terms of ensuring the safety of workers. Furthermore, as shown in Japanese Patent Application Laid-Open No. 52-90896, a device has been proposed in which a protective sub-frame is constantly biased toward the chainsaw guide plate side by a spring. There are disadvantages such as the fact that the machine is close to the cutting section, making it difficult to perform positioning work, and furthermore, it is necessary to provide mounting holes on the machine side as well. The present invention aims to solve this problem and provide a safety cover device with a simple and convenient structure.

Means for Solving the Problems Therefore, the present invention provides a method for moving the saw blade chain from a position that is pivotally connected to a chain guide bar that guides the endless saw blade chain in a slidable manner so as to cover the saw blade chain. It is characterized by being kept uncovered by automatically pivoting to a position where it can be exposed for operation.

Function: Therefore, with the structure in which the safety cover is pivotally attached to the chain guide bar itself, the exposed tip of the saw blade chain is covered when transporting the cutting machine, etc., and the cutting operation can be started. At the same time, it will automatically come off,
It is kept uncovered.

Embodiment Figures 1 and 2 show an example in which the present invention is applied to a sawing device of an automatic pruning machine, which is a type of portable saw cutting machine. (not shown) is attached to a tree trunk, a chain guide bar 1 is provided upward from the top of the body, almost parallel to the tree trunk T, and at a constant interval, and a chain guide bar 1 is provided protruding from the top of the body, and the periphery of the bar 1 is endless. A saw blade chain 2 is attached so as to be slidable, and the chain 2 is driven by a prime mover installed in the machine body.

A cover 5 made of synthetic resin is pivotally attached to the vicinity of the tip of the chain guide bar 1 by means of a threaded support shaft 6. As shown in FIG. The cover 5 has a side plate 7 and a top plate 8 facing the outer side view and tip of the bar 1, respectively, and when the cover 5 is in a position covering the saw blade chain 2 indicated by A in FIG. It is designed to cover the non-saw side portion 4 and the vicinity of the tip of the blade chain 2. The lower part 12 of the cover 5 is the top plate 8
This open portion allows the cover 5 to be moved counterclockwise from the position A covering the saw blade chain 2 to the open position shown by B in FIG.
It is designed to be able to pivot around the Note that reference numeral 13 is a guard fixed to the bar 1 and covering the non-saw side portion 4 of the saw blade chain 2. Further, the cover 5 is pivotally attached to the bar 1 by a support shaft 6 via a spacer 14 at an outer side plate 7. Furthermore, when the cover 5 is in the position A covering the saw blade chain 2 and the pruning machine is attached to the tree trunk T, the edge portion 11 of the saw-cutting side portion 3 of the top plate 8 is formed wide so that the tree trunk T
It is formed so as to be in contact with the peripheral surface of.

A pin 15 is provided in a part of the chain guide bar 1 below the support shaft 6 for pivoting the cover 5, and the other end of a tension spring 16, which has one end locked to the pin 15, is provided on the side plate 7 of the cover 5. It is locked to a locking protrusion 17. The spring 16 is connected to a line C connecting the support shaft 6 and the pin 15 when the cover 5 is in the position A covering the saw blade chain 2.
When the cover 5 is in position A, the spring 16 is on the left side of line C, that is, on the non-cutting side, and applies a clockwise tension force to the cover 5 to hold it in position A. pivoting around the pin 15 to the working side to apply a counterclockwise tensile force to the cover 5;
The cover 5 is configured to be held at position B.

The operator positions the cover 5 at position A to cover the non-saw side portion 4 and the vicinity of the tip of the saw blade chain 2, and carries the pruning machine.

When performing pruning work, the worker should hold the pruning machine against the tree trunk T.
When the saw blade chain 2 is driven and slides around the bar 1, the pruning machine spirally circles around the tree trunk T to the upper right in Fig. At the sawing side portion 3 of 2, the tree begins to move forward so as to cut the branch t protruding from the tree trunk T. At this time, the edge portion 11 of the top plate 8 of the cover 5 contacts the surrounding surface of the tree trunk T, and due to the frictional force, the cover 5 pivots counterclockwise from position A against the tensile force of the spring 16, and the spring 16 pivots further outwards beyond line C, the tensile force of spring 16 acts in a direction that promotes counterclockwise pivoting of cover 5, holding cover 5 in position B and removing the pruning machine. The pruning operation can be performed without any trouble.

Effects of the invention As described above, according to the present invention, even if sawing work is started with the cover on, the cover is automatically removed and remains uncovered, ensuring the safety of the worker. Therefore, it is possible to provide a safety cover device that is easy to handle and that is easy to handle.

[Brief explanation of the drawing]

FIG. 1 is a side view of the tip of a chain guide bar of a pruning machine equipped with a safety cover device according to the present invention, and FIG. 2 is a plan view of FIG. 1. 1... Chain guide bar, 2... Endless saw blade chain, 5... Cover, 6... Threaded support shaft, 15...
...pin, 16...tension spring, 17...locking protrusion.

Claims (1)

[Scope of utility model registration request] The saw blade chain is pivoted to a chain guide bar that slidably guides the endless saw blade chain, and automatically pivots from a position covering the saw blade chain to a position where the saw blade chain is exposed so that the saw blade chain can be worked upon starting work. A safety cover for a portable sawing machine, characterized in that the cover is maintained in an uncovered state.