JPH0132552Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wheel device for a pruning machine.

The present applicant is Utility Application No. 56-140002
30930), a main engine frame with a chain saw and an auxiliary machine frame facing it are connected by a spring, and a set of two mutually parallel drive wheels driven by a prime mover are attached to the main engine frame in the vertical direction of the tree trunk. The auxiliary machine frame is provided with a plurality of free wheels, while the main machine frame is equipped with a ram rod, which has a straight lowering wheel at its tip and a string at the rear. We have proposed a pruning machine that is pivoted so that it can be moved in and out, and is equipped with a reel wound with a string, one end of which is fixed to the ram, via a drop device.

As is well known, this pruning machine is designed to swing up or down directly around a tree trunk, but since the drive wheels are made of rubber tires, they are susceptible to slipping, especially when swinging up and down during rain. For this reason, attempts have been made to prevent this by spirally wrapping a wire around the tire, but this has the disadvantage that it easily breaks due to friction, making it difficult to put it to practical use.

The present invention eliminates the above drawbacks by simple means.

Next, an embodiment of the present invention will be explained with reference to the drawings.

As mentioned above, the main structure of the pruning machine is that the main machine frame 1 having the chain saw 2 and the auxiliary machine frame 4 facing it are connected by a spring 6, and the main machine frame 1 has four mutually parallel drive wheels 3 and The prime mover 16 is provided,
The same wheel 3 is made obliquely perpendicular to the vertical direction of the tree trunk 15,
The auxiliary machine frame 4 is provided with a plurality of free wheels 5, and the main machine frame 4 is equipped with a ram 13, which has a direct lowering track 10 at its tip and a string 17 at the rear, and the track wheels 10 are connected to the trunk of the tree. A string 1 is pivotally attached to the lever 15 so as to be able to come into contact with and separate from the string 1, and one end is fixed to the ramrod 13.
A reel 21 wound with 7 is attached via a dropping device.

Lateral guide rods 1 are provided on both sides of the main engine frame 1.
The auxiliary machine frame 4 is provided with a lateral guide cylinder 19 through which the lateral guide rod 18 is inserted. In addition,
The outer diameter of the lateral guide rod 18 is smaller than the inner diameter of the lateral guide tube 19, and has a slight play gap.

The free wheel 5 is connected to the auxiliary machine frame 4 as shown in FIG.
is pivoted to a bearing 11 by a support shaft 10a, and the support shaft 1
It is loosely supported at the tip of the fork 12 provided at 0a, and the fork 1
The direction of the support shaft 10a changes freely by the free movement of the support shaft 10a, forming a so-called caster.

The direct lowering wheels 10 are mounted on a lever 13 that is pivoted slightly below the middle of the upper and lower drive wheels 3, 3 of the main engine frame 1.
Under normal conditions, it is held at the solid line position in FIG. 2 by the force of the spring 14, and is spaced apart from the tree trunk 15.

In the embodiment, two direct-lowering wheels 10 are provided, one of which is provided at the tip of a lever 13 that is pivotally supported on the main engine frame 1, and both wheels 10, 10 are They are connected by a link 13a. In addition, 16 is the prime mover of the drive wheel 3;
Reference numeral 17 is a traction string for the lever 13, and reference numeral 20 is an interlocking device for the upper and lower drive wheels 3, 3.

The string 17 is wound around a reel 21, and the reel 21 is attached to the main engine frame 1 via a dropping device (not shown) so that it falls off when the prime mover 16 stops in response to a radio signal as described below.

Therefore, the horizontal guide rods 18 are inserted into the horizontal guide tubes 19 on both sides of the tree trunk 15, and both machine frames 1, 4 are connected.
are placed and pulled by the spring 6 to connect the upper and lower drive wheels 3,
3 and the free wheel 5 are pressed against the tree trunk 15, and the prime mover 1
When the tree trunk 15 is started, the drive wheels 3, 3 rotate and the pruning machine turns around the tree trunk 15 and rises. At that time, the free wheel 5 moves freely or follows the upward direction of the turning,
A branch 22 is cut using a chain saw 2.

When a predetermined altitude is reached, the prime mover 16 is stopped by a radio signal from the ground and the reel 21 is stopped.
falls to the ground. Therefore, when the string 17 is pulled downward, the lever 13 rotates from the solid line position to the imaginary line position in FIG. is tree trunk 1
The pruning machine will be separated from 5, and the pruning machine will be placed in both machine frames 1,
It descends directly along the tree trunk 15 while holding the tree trunk 15 between the free wheels 5 of No. 4 and the rolling wheels 10 for straight descent. In addition,
In this case, the upper driving wheels 3 act as a brake, and the pruning machine gradually descends due to the traction force of the string 17 and its own weight. At this time, the fork 12 of the free wheel 5 automatically rotates from the solid line position in FIG. 2 to the imaginary line position, and the free wheel 5 is oriented vertically.

Further, wheels 7 constituting the drive wheels 3
As shown in FIGS. 3 and 4, metal ribs 9 are integrally cast and molded using aluminum casting, and the ribs 9 protrude perpendicularly to the running direction of the drive wheels 3 (in the radial direction). ing. An elastic tire 8 made of elastic rubber is provided on this wheel 7, and the tip end surface 9a is exposed to the surface of the tire 8. Note that 9b is a notch provided on both sides of the rib 9, and the elastic tire 8 is integrated by this notch 9b.

Since the driving wheels 3 have the above-mentioned configuration, the tip surfaces 9a of the ribs 9 slightly bite into the tree trunk 15 when the tree trunk 15 is raised and lowered, so that the drive wheel 3 can easily run even in rainy weather without slipping.

As is clear from the above explanation, according to the present invention, a rib with an exposed tip is provided on the tire surface of the driving wheel, so when the rib tip surface rises and descends to the tree trunk, the tire part is dented. It protrudes slightly outward and bites into the tree trunk, so slips do not occur. Also, unlike a chain wound chain, it is durable and will not break even if the rib tips are slightly worn.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the wheel device of the pruning machine of the present invention, Fig. 2 is a side view of Fig. 1 seen from the left,
Figure 3 is a perspective view of the drive wheel, Figure 4 is Figure 3A-
It is a partial vertical cross-sectional view taken along the A line. 1... Main engine frame, 2... Chain saw, 3... Driving wheel, 4... Auxiliary machine frame, 5... Driven wheel, 6... Spring, 7... Wheel, 8... Elastic tire, 9...
Metal rib, 9a...Tip surface, 10...Rotary wheel for straight descent, 13...Role, 15...Tree trunk, 16...Motor, 17...String, 22...Reel.

Claims (1)

[Scope of utility model registration request] The main engine frame 1 having the chain saw 2 and the auxiliary engine frame 4 facing it are connected by a spring 6, and the main engine frame 1 is connected to the main engine frame 1.
A set of two mutually parallel drive wheels 3 driven by a prime mover 16 are provided obliquely with respect to the vertical direction of the tree trunk 15, and a plurality of free wheels 5 are provided on the auxiliary machine frame 4, while a plurality of free wheels 5 are provided on the main machine frame 1. A ramrod 13 having a direct-lowering wheel 10 at the bottom and a string 17 at the rear is pivoted so that the wheel 10 can approach and separate from the tree trunk 15, and one end is fixed to the ramrod 13. worn string 1
In the pruning machine, a reel 21 wound with 7 is attached via a drop device, a metal rib 9 is provided on the wheel 7 of the driving wheel 3, and the tip surface of the rib 9 is perpendicular to the running direction of the wheel 3. A wheel device for a pruning machine, characterized in that the wheel device is exposed on the surface of a tire 8.