FI127801B - Portable cutting device - Google Patents

Abstract

The invention relates to a portable cutting device. The cutting device comprises a body structure (10) on which handle (11) has been arranged for use of the cutting device and cutting devices (13) for cutting material. Furthermore, the cutting device comprises means (14) for driving the cutting devices (13) and thereby cutting the material. The cutting devices (13) comprise a blade (15) which is arranged as part of the body structure (10) and a stop (16) which is rotatable to the body structure (10). The stop (16) is arranged to rotate over the blade (15) both to push the material against the blade (15) for cutting the material, as well as to press the cut material against the body structure (10) to hold the material in grip.

Description

PORTABLE CUTTING DEVICE

The invention relates to a portable cutting device comprising a frame structure provided with it

- handles for operating the cutting device,

sharpening tools for cutting material, and

- means for actuating the cutting means and thus cutting off the material.

20185067 prh 24-01- 2018

One known portable cutter is the rifle. In a scraper, the sharpening tools consist of a rotating blade, which can be used to cut off a small tree and a hedge, for example. The frame structure includes a frame tube at one end of which is arranged to be powered by an internal combustion engine. The other 15 ends of the frame tube have an angular gear to which a circular blade is fitted. From the internal combustion engine, the force is transmitted to the gearbox by means of a shaft fitted inside the body tube. The scraper is supported by a harness and used with handles arranged in the frame tube.

The blade must rotate at high speed to achieve sufficient cutting efficiency. In this case, especially the small twigs fly around when cut. Small trees cut the twigs more predominantly, but the fall of small trees cannot be much affected. This will cut the truncated trees crosswise, which will slow down and complicate your work. In addition, the blade is poorly adapted to the terrain. Careless use can cause the blade to hit the wood incorrectly, which can cause sudden rattle swing. At the same time, the blade may hit the ground, which will quickly burn the blade.

The object of the invention is to provide a new type of portable cutting device which makes cutting the material easier and more controlled. The features of the cover cut-off device of the present invention are apparent from the appended claims. In the cutting device of the invention, in addition to the novel operation of the sharpening means, the truncated material can also be surprisingly controlled. In this case, for example, the felled trees can be moved in the desired direction and position when felling.

This facilitates clearing itself and collecting already felled trees. In addition, the cutting device is easier to use and the sharpening tools remain usable for a long time.

The invention will now be described in detail with reference to the accompanying drawings, in which:

Figure 1a is a right front oblique view of the invention

Figure 1b shows a modification of the cutting device, a modification of the cutting device according to the invention, viewed from the left front,

Figure le is a top view of a cutting device according to the invention,

Picture

2a is a side elevation view of a razor blade according to the invention,

Picture

2b shows an image

2a engraving from the right upper front

20185067 prh 24-01- 2018 viewed,

The figure shows the image le in the holding position of the cutting device.

Fig. 1a shows a portable cutting device with a frame structure 10. The frame structure is provided with handles 11 for operating the cutting device. In Figure 1a, the handles 11 30 consist of two handles 12 which can be grasped with one or two hands. The frame structure also includes sharpening means 13 for cutting material and means 14 for operating the sharpening means 13 and thus cutting material. The blade means 13 include a blade 15 disposed in part of the frame structure 10. Here, the blade is a fixed base plate of the frame structure, but the blade may be a detachable part attached to the frame structure. Further, the body 10 has a pivotably mounted stop 16 which is adapted to pivot over the blade 15 both to press the material against the blade 15 to cut the material and to press the cut material against the body 10 to hold the material. Here, in a single movement, material such as a small tree growing in the ground is cut and after the cut 10 small trees are moved in the desired direction. The stop presses the wood against the frame structure, holding the wood in place until the stop is opened (Figure 3). In other words, the tree is in the grip both during transfer and felling. In practice, for example, wood in the hold can be moved when the tree falls. Compared to conventional clearing, controlled felling and possible transfer are extra work steps that still get the trees neatly to the desired position and position.

20185067 prh 24-01- 2018

Figures 1a-a show mainly the frame structure whereby the material can be cut off. Preferably, the frame structure 10 includes an auxiliary frame 17 into which the handles 11 are fitted. The subframe facilitates handling of the cutting device. 2a and 2b, the subframe 17 is elongated, and a power source 18 is provided at an opposite end of the subframe 17 to the body structure 10, thereby balancing the cutting device and thereby facilitating the use of a portable cutting device.

Surprisingly, the power source 18 is a hydraulic unit 19 which is connected to the hydraulic cylinder 20 of the means 14.

Hydraulics provide the power to cut without a fast rotating blade. In addition, the power of the hydraulic unit can be stored, for example, in a pressure accumulator, which can be filled when the cutting device is moved to the next tree. In this case, the source of power can run smoothly and there is sufficient force to cut off. At the same time, cutting is fast. For example, the pressure accumulator may be housed within a subframe. In this case, the subframe can be used to form a pressure accumulator and to avoid additional projections. In Fig. 2a, the hydraulic assembly 19 includes an internal combustion engine 21 which drives a hydraulic pump 22. The pressure accumulator 23 is disposed within the subframe 17 and is connected to both the hydraulic pump 10 and the hydraulic cylinder by dotted lines here.

suitable

In addition to the pressure accumulator, there may be an oil tank (not shown).

by connections instead of or

A different type of power source can be used instead of a hydraulic unit.

In addition to the novel method of cutting, the structure of the cutting device differs from the prior art. Between the frame structure 10 and the subframe 17, there is a joint 24 (Fig. 2a). In this case, the cut-off point can be chosen more freely, thus adapting the rower, for example, to the terrain. At the same time, the need to move the subframe is reduced, which also makes work easier. The pivot axis of the joint 24 is preferably horizontal so that the frame structure can be slid up and down as shown in Figure 2a.

The frame structure can be pivoted, for example, by an actuator.

20185067 prh 24-01- 2018

Preferably, however, the handles 11 are connected to the frame structure 10 for pivoting the frame structure 10 to the subframe 17. In this case, the user can also naturally rotate the frame structure while controlling the cutting device. 2a and 2b, the hinge 24 includes a support arm 25 to which the horn-like handles 11 are connected by a connecting rod 26. At the same time, the handles 11 are hinged to the auxiliary body 17, thereby pushing the handles 30 11 forward to lower the frame structure. Correspondingly, when the user pulls the handles towards himself, the frame structure pivots upwards. At the same time, the handles can be used to set the frame structure to the desired height above the ground.

20185067 prh 24-01- 2018

The support arm supports the attachment of the frame structure and reduces the strain on the connecting rod. In addition, the tie-down anchor points can be changed to change the swing geometry. At the same time, the support arm forms a transmission which reduces the need to move the handles. Advantageously, the length of the connecting rod is also variable, whereby the basic position of the frame structure can be easily and quickly adjusted, if necessary. Hereby, the position of the frame structure for each mode of operation 10 is desired, while still maintaining the position of the cutting device ergonomically.

Even a single joint significantly increases the usability of the cutting device compared to known rifles. 2a and 15 2b, the subframe 17 is in two parts and the subframe 1 portions 27 and 28 are adapted to pivot with respect to each other. In this case, the position of the frame structure can also be changed laterally without changing the position of the whole cutting device. In other words, the frame structure can be tilted relative to the longitudinal axis 20 of the subframe (Figure 2b). At the same time, the razor adapts better to the terrain. On the other hand, the cut-off point can be chosen more freely. Thus, for example, oblique branches provide a straight cut surface or can be cut safely from the user above or below the tree, which has been impossible with a rigid scraper. Twisting also facilitates felling when only a portion of the cutting device tilts with the wood.

Preferably, the power source 18 is in the first part 27, the body 30 being the structure 10 and the handles 11 in the second part 28.

Thus, in practice, the first part and its power sources remain stationary when the frame structure can be rotated with respect to two degrees of freedom. In addition, swiveling can be done by holding the handles without removing the grip, which makes the job

20185067 prh 24-01-2018 natural work. In this case, the cutting device with its subframe is like an extension of the user's hands, whereby wood or other material growing on the ground can be cut and controlled in the desired direction and at the desired location.

The shown frame structure is welded from the bent sheet parts. In addition, some of the panel members are lightened with openings. In this case, the frame structure is rigid but as light as possible. Here, one stop 16 is used to press the wood 29 against the blade 15. The stop 16 is pivotally mounted on a vertical shaft 30 and is actuated by a single hydraulic cylinder 20. The hydraulic pump may be connected to the power source or closer to the frame structure, preferably within the frame pipe. The placement of the components in the cutter unit is balanced. In the embodiment of Fig. 1a, a separate power source can be used, which is connected by flexible hoses to the frame structure. In this case, the user only needs to control the frame structure and part of the hose mass. The power source may be a separate movable power unit or the hydraulic pressure is taken, for example, from a hydraulic pump mounted on the ATV (not shown).

In Fig. 3, the stop 16 has turned about 100 degrees from the position of Fig. Le. The stop 16 has pressed the wood 29 against the blade 15 and as it passes over the blade 15 has pushed the wood 29 against the frame structure 10. This keeps the wood in the grip and can be directed in the desired direction in a controlled manner. For example, by taking a few steps, several chopped trees can be moved and felled in the same pile, which is then easy to collect mechanically. In this case, the cutting device according to the invention avoids a separate assembly step. Trees can even be found under a thin layer of snow. Here, the diameter of the small tree is about 25 mm and the diameter of the larger dotted circle is about 80 mm. In practice, therefore, even thick trees can be cut with the cutting device. With the geometry shown, a stroke of about 80 mm on the hydraulic cylinder is sufficient. The shaft 30 of the stop 16 has a shaft 31 to which the hydraulic cylinder 20 is attached (Fig. Ib).

The cutting device according to the invention can also be adapted as a hand tool. In this case, the handles are arranged as means for operating the sharpening means and thus for cutting off the material. The application may be, for example, single-hand pruning shears or two-hand pruning shears. The scissors allow the rower to break the branches more freely while the hull remains upright. However, the branches 10 remain in the grip of the cutting device and can thus be moved in a controlled manner to the desired location.

Claims (7)

A portable cutting device comprising a frame structure (10) provided with 5 - handles (11) for operating the cutting device, sharpening means (13) for cutting material, and - means (14) for actuating the sharpening means (13) and thereby cutting off the material, in which the cutting means (13) partly A blade (15) fitted to the frame structure (10) and a rotatable stop (16) adapted to pivot over the blade (15) to both press the material against the blade (15) to cut the material and to press the cut material against the frame structure (10) mate15 for holding the rial, and the frame structure (10) includes a subframe (17) to which the handles (11) are fitted, and the frame structure (10) and the subframe (17), characterized in that the handles (11) are connected . 20185067 prh 10 -09- 2018 Cut-off device according to Claim 1, characterized in that the subframe (17) is elongated and a power source (18) is provided at the opposite end to the subframe (10). Cut-off device according to claim 2, characterized in that the power source (18) is a hydraulic unit (19) connected to the hydraulic cylinder blades (20) of the means (14). Breaking device according to one of Claims 1 to 3, characterized in that the subframe (17) is twofold and the parts (27, 28) of the subframe (17) are arranged to rotate relative to one another. The cutting device according to claim 4, characterized in 5, the power source (18) being in the first part (27), the frame structure (10) and the handles (11) being in the second part (28). The cut-off according to any one of claims 3-5, 10, characterized in that the hydraulic unit (19) comprises a pressure accumulator (23). The method of claim 7 6 adequate cut-off machine, hours that the pressure accumulator (23 ) is fine the subframe (17) 15 in. The method of claim 8 7 adequate cut-off machine, hours characterized in that the handles (11) are arranged as means (14) for actuating the cutting means (13) and thus for cutting off the material 20. The cutting device according to claim 8, characterized in that the cutting device is arranged as a hand tool.