RU149945U1 - BURAW DYNAMOMETER - Google Patents

Abstract

A borom-dynamometer, including a cylindrical hollow body with a cutting head, a handle, characterized in that a pointer dynamometer is integrated in the handle, including a scale, in the center of which there is a movable arrow, on which axis there is a gear wheel spring-loaded relative to the handle body, which interacts with a toothed half-wheel, having in its body a longitudinal groove located in the radial direction, into which the end of the shaft enters, rigidly connected with its other end to a cylindrical m hollow body.

Description

The device relates to the forest industry, in particular to forestry.

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 torque applied to the handle when screwing / unscrewing the drill. This fact does not allow the use of this device without significant refinement when conducting studies to establish the magnitude of the torque required to screw in / out the drill and control its value.

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 impossibility of determining the torque applied to the handle when screwing / unscrewing the drill. This fact does not allow the use of this device without significant refinement when conducting studies to establish the magnitude of the torque required to screw in / out the drill and control its value.

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 impossibility of determining the torque applied to the handle when screwing / unscrewing the drill. This fact does not allow the use of this device without significant refinement when conducting a study to establish the magnitude of the torque required to screw in / out the drill and control its value.

The technical result of the proposed device is to expand the functionality of the drill, the ability to control the force applied to the handle, and thereby reduce the likelihood of breakage of the device.

The technical result is achieved by the fact that a dial dynamometer is integrated in the handle, including a scale in the center of which a movable arrow is mounted, on one axis with which a gear wheel is mounted, which is spring-loaded relative to the handle body by a torsion spring, which interacts with a gear half-wheel having in its body located in the radial direction a longitudinal groove, which includes the end of the rod, rigidly connected to its other end with a cylindrical hollow body.

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

The device consists of a cylindrical hollow body 1 with a cutting head 2 at one end and a handle 3 at the other. A dial dynamometer 4 is built into the handle 3.

The dial dynamometer 4 will show the magnitude of the torque applied to the handle 3 at various time intervals about the proposed device.

As an arrow dynamometer 4, it is convenient to use a design known from the prior art, including a scale 5 with a movable arrow 6. A movable arrow 6 is mounted in the center of the scale 5. A gear wheel 8 is installed on the same axis 7 with the arrow 6. Gear 8 to prevent spontaneous rotation axis 7 is spring-loaded with a torsion spring 9. A torsion spring 9 is attached at one end to a gear 8 fixedly mounted on an axis 7, and at the other end attached to a dial dynamometer casing 4. A gear 8 enters in engagement with the gear half-wheel 10, which is installed in such a way that its axis of rotation 11 is on the line 12 passing through the axis of rotation of the gear wheel 8 and the axis of rotation 13 of the drill-dynamometer. The gear half-wheel 10 in its body has a radial longitudinal groove 14. The gear half-wheel 10 is connected to the cylindrical hollow body 1 by means of the rod 15. The rod 15, located along line 12, is fixed at one end to the hollow cylindrical body 1, and the other bent the end enters the longitudinal groove 14 of the gear wheel 10. To protect the dynamometer mechanism from mechanical damage, it is equipped with a protective casing 16.

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 dynamometer is installed so that the cutter head 2 of the cylindrical hollow body 1 is facing the tree trunk. Then the drill-dynamometer is pressed against the tree trunk and at the same time the handle 3 rotates. Under the action of the pressing force of the drill-dynamometer on the tree trunk with its simultaneous rotation by the handle 3, the cutter head 2 will be embedded in the tree trunk wood. In this case, the arrow dynamometer 4 will show the magnitude of the torque applied to the handle 3.

When screwing the drill-dynamometer into the wood as a result of applying force to the handle 3, the hollow cylindrical body 1 will twist, as a result of which the rod 15 is rigidly connected to the hollow cylindrical body 1 with its other end to affect the side surface of the longitudinal groove 14 of the toothed half-wheel 10, as a result of which there will be a rotation of the gear half-wheel 10 about its axis by a certain angle, the value of which will depend on the amount of twisting of the hollow cylindrical gear whisker is directly dependent on the applied to the handle 3 of torque. In this case, the gear half-wheel 10, which engages with the gear 8, will rotate it. When the gear 8 is fixedly mounted on the axis 7, the axis 7 will be rotated at the same angle, as a result of which the movable arrow 6 is fixedly mounted on the axis 7. The magnitude of the deviation of the movable arrow 6 relative to the scale 5 can be used to judge the value applied to the handle 3 torque. After removing the load from the handle 3 under the action of the torsion spring 9, the movable arrow 6 fixedly mounted on the axis 7, rigidly connected to the gear 8, will return to its original position corresponding to the position "zero" on the scale 5 of the dynamometer 4.

After the introduction of the drill into the tree trunk to the required depth from the cylindrical hollow body 1 using the probe is extracted wood core. The drill is twisted out of the tree trunk. In this case, the arrow dynamometer 4 will show the twisting force applied to the handle 3.

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.

The proposed device has enhanced functionality, so it can be used to determine the amount of force required to cut the wood fibers, which will allow you to compare the efficiency of cutter heads of various designs depending on the density of wood.

The design of the proposed device due to the presence of a scale with an arrow provides the ability to visually control the power load on the handle, which will prevent the application of excessively large forces that could lead to breakage of the hollow cylindrical body and thereby reduce the likelihood of breakage of the device.

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 borom-dynamometer, including a cylindrical hollow body with a cutting head, a handle, characterized in that a pointer dynamometer is integrated in the handle, including a scale, in the center of which a movable arrow is mounted, on one axis of which a gear wheel is installed, spring-loaded relative to the handle body, by a torsion spring, which interacts with a toothed half-wheel, having in its body a longitudinal groove located in the radial direction, into which the end of the shaft enters, rigidly connected with its other end to a cylindrical m hollow body.

Images