RU134477U1 - BORAW FOR CORRECTION OF WOOD - Google Patents

Abstract

The device relates to the forest industry and can be used to take cylindrical wood samples, including standing trees during its certification, to study the physicomechanical properties of wood, to determine the extent of its damage by fungi, to study the dehydration and impregnation of wood to determine the degree of dehydration of its various layers and establishing the penetration depth of the impregnating liquid. The drill for taking a core of wood contains a hollow cylindrical body with a cutting head and a handle, characterized in that on the outer surface of the hollow cylindrical body a restrictive device is installed, made in the form of a split ring with a clamping mechanism. The technical result of the proposed device is to enable the most accurate job required for taking a core of wood depth of the hole in the studied timber.

Description

The device relates to the forest industry and can be used to take cylindrical wood samples, including from standing trees, to certify the wood of growing and fallen trees, to study the physicomechanical properties of wood, to determine the degree of damage to its fungi, to establish the state of wood elements of various building structures, in the study of dehydration and wood impregnation processes to determine the degree of dehydration of its various layers and establish the depth of penetration novena impregnating liquid.

Known drill for core extraction of wood having a screw and screwless cutting parts with a feed mechanism. The feed mechanism is made in the form of an additional hollow body with an internal thread and a lead screw with an external thread installed inside the additional body. At the end of the casing on the auger side, holes are made with recesses and eyes with a mechanism for attaching the auger to a tree. The lead screw from the side opposite from the cutting head has a handle, for which it is rotationally driven [1].

A disadvantage of the known device is the difficulty of accurately determining the depth of its screwing into the wood, which, as a rule, should be limited when reaching the center of the tree trunk. Since, if the depth of screwing in the drill is less, then using the taken core of wood it will not be possible to accurately determine the age of the tree. If the screwing depth is much greater than the specified value, then unreasonable damage to the tree trunk will be caused, since the hole formed in the tree trunk when taking a core of wood will have an excessively large depth, which can cause the death of a growing tree.

Known Presler drill containing a hollow cylindrical body, a drill with a cutter head, a pen and a probe. When taking a core of wood, the drill needs to be pressed against the tree and at the same time rotate the handle. It is necessary to press until the cutter head passes through the bark and penetrates the wood to a depth sufficient to provide the pulling force of the drill in the wood due to screw cutting on its cutter head [2].

A disadvantage of the known device is the difficulty in determining the actual depth of its screwing into the wood when taking the core.

The technical result of the proposed device is to enable the most accurate job required for taking a core of wood depth of the hole in the studied timber.

The technical result is achieved by the fact that on the outer surface of the hollow cylindrical body there is a restrictive device made in the form of a split ring with a clamping mechanism and having the ability to move along the cylindrical body for installation at a predetermined distance from the cutting head ..

Figure 1 presents a General view of the proposed drill for taking a core of wood. Figure 2 shows a section aa of the drill for taking a core of wood with a restrictive device installed on it. Figure 3 shows a General view of the locking device of the drill for taking a core of wood (11, 12 are not shown).

The drill for taking a core of wood consists of a cylindrical hollow body 1 with a cutting head 2 at one end and a handle 3 at the other end. On the outer surface of the cylindrical hollow body 1, a restriction device 4 is installed. The restriction device 4 is made in the form of a detachable ring consisting of two half rings of the upper 5 and lower 6 from one edge having eyelets with holes in which the axis 7 is inserted and connected in such a way that they are ensured a rotation as a result of which the half rings form a ring. On the other side of the half ring 5, 6 there are flanges 8, 9. A hole with a thread is made in the flange 8 of the lower 6 half of the ring 10. A longitudinal groove is made in the flange 9 of the upper 5 half of the ring for free passage of the pin 10. On the free end of the pin 10 are installed a washer 11 with a nut 12. On the inner surface of the half rings 5, 6 are installed pads 13 made of a material with a high coefficient of friction.

A drill for taking a core of wood is used as follows. First, the diameter of the tree under investigation is estimated, for example, using a measuring fork. Then, the tightening of the nut 12 of the restriction device 4 is loosened and the restriction device 4 is set at a certain distance from the cutting head 2. The value of this distance is calculated depending on the previously measured diameter of the tree trunk, so that when the drill is screwed in to take the core of the wood into the trunk of the tree under study entered the trunk of the tree under investigation to the minimum necessary depth, which ensures the taking of a core of wood, which makes it possible to evaluate the studied parameters of wood. After installing the restriction device 4 at the required distance from the cutting head 2, the nut 12 is twisted. As a result of this, the half rings 5, 6 are closed and tightly squeeze the outer surface of the cylindrical hollow body 1. At the same time, due to the presence of overlays 13, the restriction device 4 is securely fixed on the outer surface of the cylindrical hollow body 1 at a predetermined distance from the cutting head 2. Then, the drill head is cut 2 is attached to the tree under investigation, is pressed firmly and at the same time rotates by the handle 3. Thus, the drill for taking a core of wood is screwed into the trunk of the tree under investigation until the edges an effective device 4 does not touch the tree trunk. Then, a drill for taking a core of wood is twisted out of the trunk of the investigated tree and a core of timber is extracted from it.

For ease of use of the proposed device on the outer surface of its cylindrical hollow body 1, a linear scale can be applied, which will allow you to install the restrictive device 4 at the required distance from the cutting head 2 without using an additional measuring tool.

The presence of a restrictive device on the outer surface of the cylindrical hollow body of the drill for taking a core of wood will limit the depth of screwing of the drill into the tree trunk to the minimum necessary value determined by the purpose of the study of the core of wood. This will reduce the likelihood of causing too much damage to the tree trunk by reducing the depth of the hole in the tree trunk to the required minimum value.

BIBLIOGRAPHY

1. Patent RU 2163865 Russian Federation, IPC ⁷ B27G 15/00. A drill for extracting a core of wood / Almetov A.N .; Applicant and patent holder: Mari State Technical University. No. 99123988/13; declared 11/16/1999; publ. 03/10/2001.

2. Anuchin N.P. Forest taxation: Textbook for universities, - 5th ed., Ext. -M .: Forest industry, 1982.

Claims (1)

A wood core drill containing a hollow cylindrical body with a cutting head and a handle, characterized in that on the outer surface of the hollow cylindrical body there is a restriction device made in the form of a split ring with a clamping mechanism and having the ability to move along the cylindrical body for installation at a given distance from the cutting head.

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