RU157144U1 - BORAW WITH PRESSED DYNAMOMETER - Google Patents

Abstract

A drill with a clamp-dynamometer, comprising a body with a cutter head at one end, a shank at the other, a handle, characterized in that a clamp-dynamometer is installed on the shank, which provides transmission and measurement of the applied axial force, having a hollow cylindrical body with a longitudinal groove located along its geometric axis, and inside the hollow cylindrical body is a spring-loaded compression spring rod connected with a pointer that can move along a longitudinal groove.

Description

The device relates to the forest industry and can be used to determine the magnitude of the axial force applied to the drill when taking cylindrical wood samples.

Known drill for extracting a core of wood [1], having 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 on the opposite side from the cutting head has a handle, for which it is rotationally driven.

A disadvantage of the known device [1] is the inability to determine the magnitude of the axial force applied to the housing of the device when it is screwed into the wood. This does not allow the use of the known device without refinement in order to conduct experimental studies to establish the magnitude of the axial force required to screw in the drill.

Known age drill for extracting wood core [2], consisting of a cylindrical hollow body with an external screw thread at one end and a shank at the other end. The handle is connected to the shank of the cylindrical hollow body by means of a ratchet mechanism, allowing the screw to be screwed in without intercepting the handle.

A disadvantage of the known device [2] is the inability to determine the magnitude of the axial force applied to the drill while drilling wood. This fact does not allow the use of the known device without significant refinement when conducting experimental studies to establish the magnitude of the axial force required to screw in the drill.

The closest prior art and taken as a prototype is a Presler drill [3], containing a cylindrical hollow body with a cutter head at one end, a shank at the other and a handle. 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 into the wood to a depth sufficient to provide the pulling force of the drill into the wood due to screw cutting on its cutter head. After screwing the drill to the desired depth, a core of wood is extracted with the help of a probe.

A disadvantage of the known device [3] is the inability to determine applied to the drill when it is screwed in the value of the axial force. This fact does not allow the use of this device without significant refinement when conducting experimental studies to establish the magnitude of the axial force required to screw in the drill.

The technical result of the proposed device is to expand the functionality by providing the ability to determine and control the axial force applied to the body and thereby reduce the likelihood of deformation of the hollow body from the application of excessively large loads of pressing the drill to the tree trunk due to timely load control.

The technical result is achieved by the fact that a clamp-dynamometer is installed on the shank, which provides transmission and measurement of the applied axial force, having a hollow cylindrical body with a longitudinal groove located along its geometric axis, and a rod spring-loaded compression spring connected to the pointer is located inside the hollow cylindrical body, with the ability to move along the longitudinal groove.

In FIG. 1 shows a General view of the proposed device. In FIG. 2 shows a General view of the device with a local section.

The device consists of a housing 1 with a cutting head 2 at one end and a shank 3 at the other. On the shank 3 there is a handle 9 and a pressure dynamometer 4.

The clamp dynamometer 4 will show the magnitude of the axial force applied to the device 1 at various operating time intervals.

As a clamp-dynamometer 4, it is convenient to use a design known from the prior art, including a hollow cylindrical body 5 with a scale located along a longitudinal groove, inside which a pointer 7 freely moves, rigidly connected to a rod 6 mounted inside the hollow cylindrical body 5. Between the rod 6 and the bottom a hollow cylindrical body 5, located on the side of the shank 3 of the device, a compression spring 8 is installed, through which the axial force applied to the device is transmitted and controlled when pressed against a tree trunk.

Rotation to the housing 1 of the device is transmitted from the handle 9, which is connected to the clamp-dynamometer 4 through a thrust bearing 10.

The work of the proposed device is as follows. The tree to be sampled is selected. On the selected tree, a core sampling point is planned. At this point, perpendicular to the tree trunk, a drill is installed with a clamp-dynamometer, so that the cutter head 2 of the housing 1 is facing the tree trunk. Then, the proposed device is pressed to the tree trunk through the clamp-dynamometer 4 and at the same time the handles rotate 9. Under the force of pressing the device to the tree trunk with its simultaneous rotation by the handles 9, the cutter head 2 will be embedded in the wood of the tree trunk. In this case, the pointer 7, moving in the longitudinal groove of the hollow cylindrical body 5, will show the magnitude of the axial force applied to the device.

When the device is screwed into the wood as a result of applying axial force to the rod 6, the spring 8 will compress, which will lead to the movement of the pointer 7 along the scale made on the hollow cylindrical body 5 of the clamp-dynamometer 4. After removing the load from the rod 6 under the action of the compression spring 8 pointer 7, rigidly connected to the stem 6, will return to its original position corresponding to the position "zero" on the scale of the clamp-dynamometer 4.

After the device is introduced into the tree trunk to the required depth, the core of the wood is extracted from the body 1 using the probe. The device is twisted out of the tree trunk.

After taking a core of wood, the hole formed in the tree trunk should be filled with a special composition, for example, garden varnish, which will protect the damaged place from the penetration of air, water, bacteria, fungi and insects.

BIBLIOGRAPHY

1. Pat. 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. Pat. 134847 Russian Federation, IPC7 B27G 15/00. Age drill for wood core extraction / Lukashevich V.M., Shegelman I.R., Vasiliev A.S., applicant and patent holder Petrozavodsk State University. - No. 2013118815/13; declared 04/23/2013; publ. 11/27/2013. Bull. No. 33.

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

Claims (1)

A drill with a clamp-dynamometer, comprising a housing with a cutter head at one end, a shank at the other, a handle, characterized in that a clamp-dynamometer is installed on the shank, which provides transmission and measurement of the applied axial force, having a hollow cylindrical body with a longitudinal groove located along its geometric axis, and inside the hollow cylindrical body is a spring-loaded compression spring rod connected with a pointer that can move along a longitudinal groove.

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