JPH0331160Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The invention relates to a spring guide wrapped around the frame of a branching machine that lifts itself up against the trunk of a tree such as cypress or cedar and automatically cuts branches. It is something.

Prior Art The machine frame of this type of pruning machine is designed so that the winding frame can be moved closer to the main frame, which forms a generally circular machine frame in plan view, by opening the winding frame on one side. A winding spring that is movably connected to one end of the main frame by an appropriate connecting means is wound around a winding spring guide of the winding frame, and the other end can be freely engaged and detached from the other end of the main frame. There are some that are configured such that both frames can be elastically approached to each other by being locked to each other.

According to this, by temporarily releasing the wrapping spring, taking the tree trunk into both frames, and locking it again, the tree trunk can be moved using an appropriate number of wheels installed on the main frame side and the wrapping frame side respectively. The surrounding area is held in abutment.

Then, when a predetermined wheel among these wheels is driven, the machine rises with respect to the trunk, and when this rises,
A chainsaw mounted in an upright position above the tree is rotated against the trunk to cut branches on the way up.

Therefore, even if the diameter of the trunk changes as it rises, in order to apply the coiled spring force around the trunk with an approximately constant force so that the wheels can contact and hold the trunk, it is necessary to It is desirable that the wrapping spring is wrapped around the wrapping spring guide so that the expansion and contraction changes occur smoothly.

However, in general, a structure is adopted in which the coiled spring is inserted into a coiled spring guide formed by bending a circular pipe into a curved shape in plan view. Increasing the inner diameter causes problems such as an increase in weight and the need to increase the strength of the connecting means.To avoid this, a circular spring with an inner diameter slightly larger than the outer diameter of the coiled spring Since a pipe was used, the coiled spring did not expand and contract smoothly, resulting in unstable clamping force.

In addition, as a solution to such problems,
As seen in Japanese Utility Model Application Publication No. 56-145961, guide plates are attached to the top and bottom of a wrapped spring guide formed by bending a circular pipe into a curved shape in plan view, and the outer surface of the circular pipe is formed into a wrapped spring guide. However, this method requires a guide plate in addition to the circular pipe, which increases the number of parts and causes the coiled spring to come off from the coiled spring guide when the coiled spring is reduced in size. However, when the coiled spring is extended, it is necessary to align the coiled spring along the coiled guide portion each time, which is a troublesome operation.Also, when changing the diameter of the coiled spring, There are problems such as the need to prepare circular pipes with different diameters, and the convex position of the circular pipe at the bottom of the guide groove, which causes the extended coiled spring to meander and make the clamping force unstable. Occurred.

Purpose of the invention The purpose of the invention is to provide a wrapped spring guide that is lighter in weight, easier to assemble, stabilizes the clamping force during pruning work, and improves the operability of the wrapped spring. .

Structure of the invention The feature of the invention is that by bringing the winding frame close to each other, the winding frame can be freely moved near and far by opening one side with respect to the main frame, which together forms a generally circular machine frame in plan view. The winding spring with one end attached to the winding frame is wound around the winding spring guide of the winding frame, and the other end is removably locked to the other end of the main frame. In a branching machine frame in which both frames can be elastically approached to each other, the cross-sectional shape of the wrapping spring guide is formed into a curved shape with an outward opening, and inwardly bent portions are formed at both ends. At the same time, a detachment prevention piece is provided on the outer opening side near both ends.

Embodiment To explain the present invention in more detail based on the drawings, it has a convex curved shape in plan view, and
A vertical connecting pin in which connecting members 4a and 4b are connected, in which wrapping spring guides 2 having an outward opening and a curved cross-section, such as a semi-circular round pipe with a cutout in cross-section, are disposed at the center and at the upper and lower positions of a vertical pipe member 3, respectively. Around 4,
By being configured to be rotatable in a horizontal plane, these form the winding frame 1, while concave curved members 6 having a concave curved shape in plan view are arranged in series at the upper and lower positions of several vertical members 7... For the main frame 5, the winding frame 1
are connected by appropriate connecting means 8 so that they can be moved near and far by opening one side.

Then, one end of the winding spring 9 is attached to one end side of the concave curved member 6 of the main frame 5, and the winding spring 9 is telescopically wound along the guide groove of the winding spring guide 2, and a hook provided at the other end is attached. The portion 9a is configured to be freely engageable and detachable from a locking portion 6a provided on the other end side of the concave curved member 6.

In this embodiment, the main frame 5 is used as the connecting means 8 as appropriate.
The other end of the connecting arm body 11 pivotally connected to one end side by a pivot pin 10 is connected to the vertical pipe member 3 on the winding frame 1 side.
When the frame 1 and the frame 5 are attached to the machine and the frames 1 and 5 are brought close to each other, the machine frame is formed to have a generally circular shape in plan view.

Note that both ends of the wrapping spring guide 2 are connected to the wrapping spring 9.
These bent portions 2a,
Displacement prevention plates 2b, 2b are fixed near 2a to prevent the coiled spring 9 from coming off from the guide groove.

Further, it is preferable that the cross-sectional curved shape of the outer opening of the wrapping spring guide 2 is formed into a curved shape such as an arc having a larger curvature than the maximum outer diameter at the natural length of the wrapping spring 9 wound around this guide groove. .

Further, on the main frame 5 side and the winding frame 1 side, an appropriate number of wheels 12 . . . are arranged with a predetermined upward lead angle.

Therefore, once the hook portion 9a is released from the locking portion 6a, the hook portion 9a returns to the one end position of the wrapping spring guide 2, and then the wrapping spring guide 2 is automatically released on one side by the force of the wrapping spring 9. It takes a retreating position,
Then, by taking the tree trunk 13 inward and locking the hook part 9a to the locking part 6a again, both frames 1 and 5 elastically approach each other, and at the same time, these wheels 12... It can be attached by touching and holding it.

Furthermore, on the main frame 5 side of this pruning machine, there is a transmission case 1 equipped with a prime mover 15 and a chain saw 16.
4 is installed, and the power of this prime mover 15 is appropriately decelerated within this transmission case 14 and transmitted to the chain saw 16, as well as to predetermined wheels 12 on the side of the main frame 5 that are interlocked and connected. As mentioned above, the machine mounted on the trunk 13 is raised spirally relative to the trunk 13, and the branches on the way up are cut by the chain saw 16 mounted in an upright position.

In addition, this pruning machine is equipped with a forward/reverse switching mechanism 17 that automatically switches a predetermined wheel from forward rotation to reverse rotation and lowers the predetermined wheel 12 when the pruning machine ascends a desired set distance. 16
A floating cover 18 for guiding the cut branches out of the machine body and a switch 19 for stopping the operation of the lowered motor 15 are provided.

Effects As is clear from the above description, according to the present invention, the cross-sectional shape of the wrapped spring guide 2 is formed into a curved shape with an outward opening, and the inwardly bent portions 2a, 2a are formed at both ends thereof. At the same time, since the detachment prevention pieces 2b are provided on the outer opening side near both ends, it is possible to use a conventional pipe-structured coiled spring guide with a coiled spring inserted therein, or a pipe-structured coiled spring guide. Compared to a structure in which guide plates are provided above and below the coiled spring guide and the coiled spring is placed along the outer periphery of the coiled spring guide, the weight of the outer opening is reduced, and the existence of the outer opening allows the winding The work of assembling the wrapping spring 9 to the wrapping spring guide 2 becomes easier, and the latter mentioned above also prevents the wrapping spring from coming off the outer periphery of the wrapping spring guide when the wrapping spring is reduced. Although there was a problem, in the present invention, when the wrapping spring 9 is contracted, the wrapping spring 9 does not come off from the wrapping spring guide 2 due to the presence of the detachment prevention pieces 2b, 2b. Its operability is improved, and by forming the inwardly bent portions 2a, 2a at both ends of the wrapping spring guide 2, when the wrapping spring 9 expands and contracts,
The wrapping spring 9 can be smoothly operated without being caught on the wrapping spring guide 2.

Further, since the wrapping spring guide 2 has a curved cross section, the curvature can be freely formed, and the selection range of the diameter of the wrapping spring 9 can be expanded. Since the groove of the spring guide 2 can be formed more appropriately, the wrapping spring 9 wound around the guide groove can be smoothly expanded and contracted, and its clamping force can be stabilized.

[Brief explanation of the drawing]

FIG. 1 is a side view of a pruning machine embodying the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a perspective view of a wrapped spring guide. Code, 1... Wrap frame, 2... Wrap spring guide,
5...Main frame, 8...Appropriate connection means, 9...Wrap spring.

Claims (1)

[Scope of utility model registration request] As the winding frame 1 approaches, the winding frame 1 is connected to the main frame 5, which together forms a generally circular machine frame in plan view, by an appropriate connecting means 8 so as to be movable near and far by opening one side. A winding spring 9 with one end attached to the main frame 5 is wound around the winding spring guide 2 of the winding frame 1, and the other end is removably locked to the other end of the main frame 5,
In the frame of a pruning machine in which both frames 1 and 5 are configured to be able to approach each other elastically, the cross-sectional shape of the wrapping spring guide 2 is formed into a curved shape with an outward opening. At the same time, a detachment prevention piece 2 is formed on the outer opening side near both ends.
A wrapping spring guide for a branching machine frame, characterized in that b, 2b are provided.