RU2811361C1 - Counting and locking device - Google Patents

Abstract

FIELD: measuring devices.

SUBSTANCE: invention can be used in control and measuring equipment, in particular in the technical means for astronomical observations. The counting and locking device for a sextant contains a body, shafts, grooves on the shafts, gears and a wheel for indicating the count. In this case, the gears mounted on the shafts are connected to the indication wheel and the minute wheel, the indication wheel is connected in the same plane with the minute wheel due to the shafts, between which a splined connection is installed, inside the case is divided into two segments by a partition, against which the spring mechanism rests, ending with a button, a rib is fixed between the spring mechanism and the shaft, and bearing units are installed in the partition between the shafts.

EFFECT: providing the ability to measure angles with an accuracy of one arc minute; simple transition to measurements in a different range of angle values; possibility of installation on a sextant.

1 cl, 2 dwg

Description

The invention relates to the field of measuring devices and can be used in control and measuring equipment, in particular in technical means for astronomical observations.

A known angle measuring device is known, for example a protractor of the UT type [GOST 5378-50 group P54] consisting of a disk base with a degree scale attached to a ruler. The movable ruler rotates on axis 3 together with the sector on which the vernier is fixed. The micrometric feed of the ruler with the sector is carried out with a nut, after which the ruler is secured with a stopper. Measurements in the range of 0-90° are made using a square, over 90° - without a square. The vernier scale has 30 divisions, and these 30 divisions in angular measurement correspond to 29° of the protractor scale. Therefore, each division of the vernier is 29/30 degrees, i.e. each division of the vernier is shorter than one division of the main scale by 1/30 or 2/60 degrees, or 2 minutes, which corresponds to the reading value on this vernier.

This protractor records the angle reading from 0 to 180°. Due to its design, it is not capable of integration into a sextant to maintain the necessary count of angular units.

Control and measuring equipment is also known, for example, a retrograde clock indication mechanism with a safety device [Dandan Mehdi, Patent for invention No. 2761129 C1 IPC 19/00 05.2021], containing a wheel for indicating the reading, a number of gears, grooves for communication between gears and other elements.

This device is identical to the claimed invention in terms of the method of indicating readings of reference information, as well as the method of operation of the device itself, and therefore was chosen as a prototype. However, it is not suitable for measuring goniometric quantities, and also lacks the possibility of integration into a sextant.

The claimed invention is aimed at obtaining an accurate reading of the required angular values, being installed in a sextant designed to measure the angles between the directions of rays from different luminaries.

The technical result of the invention consists of:

- the ability to measure angles with an accuracy of one arc minute;

- the possibility of a simple transition to measurements in a different range of angle values;

- the possibility of installation on a sextant and pairing with the rotating elements of the sextant.

This task is achieved by the fact that the reading and stopping device for a sextant, containing a housing, shafts, grooves on the shafts, gears, and a wheel for indicating the reading, has the following features.

Gears mounted on shafts are connected to an indicator wheel and a minute wheel. The indication wheel is connected in the same plane to the minute wheel due to shafts, between which a splined connection is installed. Inside, the housing is divided into two segments by a partition against which a spring mechanism rests, ending with a button; a rib is fixed between the spring mechanism and the shaft. Bearing units are installed in the partition between the shafts.

The essential features of the claimed invention are related to the achieved technical result as follows.

Measuring angles with an accuracy of up to one minute is possible only by integrating the reading locking device into the sextant and connecting the indication wheel in the same plane with the rotating elements of the sextant. For example, with a sextant shaft on which a mirror is mounted. Then the indication wheel is directly related to the relative deviation of the mirror plane. This allows you to record the deflection of the sextant mirror in angular degrees. The observer, pressing the button, disengages the gears, giving free play to the shaft connected to the indication wheel. Moreover, the gears disengage in such a way that the specified position of the angular minutes count is fixed. Next, the observer can freely move the sextant mirror to the required angle, and the value of the angular degrees will be recorded. After setting the countdown to the required value, the observer releases the button. In this case, the gears engage in mesh at a fixed count of angular minutes. Rotation of the sextant mirror shaft is only possible with the help of the minute wheel. Next, the exact countdown is set with the minute wheel and the value of the angular minutes is recorded. To make it possible to maintain an accurate reading, gears on the shafts are located inside the reading locking device.

Figure 1 shows a diagram of the read-stop device, top view. Figure 2 is a diagram of a read-stop device when a button is pressed, top view.

Shafts 2, 3, 4, 5, 6 are installed in housing 1. Shaft 2 has a splined connection 7 with shaft 6. Gear 8 is mounted on shaft 2, gear 9 and gear 10 are mounted on shaft 3, gear 11 is mounted on shaft 4, and gear 12, gear 13 and gear 14 are mounted on shaft 5, gear 15 is mounted on shaft 6. Gear 8 engages with gear 9 of shaft 3. Gear 10 engages with gear 11 of shaft 4. Gear 12 engages with gear 13 of shaft 5. Gear 14 engages with gear 15 of shaft 6. Button 16 ensures movement of shaft 5 until gears 14 and 15 disengage. After this, the reading-locking device is free to move along the plane of the dial to any angle. Release of the button 16 again engages, due to the spring mechanism 17, gears 14 and 15 at the minute countdown value that gears 14 and 15 were fixed before they were disengaged. The button 16 is engaged with the shaft 5 by means of a rib 18. For additional fixation, a partition 19 is installed in the housing 1 of the shafts 2, 4, 5, with bearing units 20, 21, 22. To move the rib 18 along the shaft 2, a bearing unit 23 is installed. To connect rib 18 to shaft 5, bearing 24 is used, which is in connection with rib 18 and shaft 5. Bearing 25 acts as an additional fixation for shaft 3. Indication wheel 26 is connected to shaft 6, and minute wheel 27 is connected to shaft 2.

The operation of the read-stop device is as follows.

When button 16 is pressed, shaft 5 moves until gears 14 and 15 disengage. In this case, the splined system 7 is activated, through which shaft 2 becomes stationary relative to shaft 6. The consequence of these actions is the freedom of movement of shaft 6 along the plane of the dial to any angle. After setting the required angle, button 16 is released. Due to the spring mechanism 17 and the rib 18, the shaft 5 moves until it engages the gears 14 and 15, while the gear 15 engages the gear 14 at the set count of the minute wheel 27. The minute wheel 27 sets the exact count of angular minutes.

Claims (1)

A counting and locking device for a sextant, containing a housing, shafts, grooves on the shafts, gears, a wheel for indicating the reading, characterized in that the gears mounted on the shafts are connected to the indication wheel and the minute wheel, the indication wheel is connected in the same plane to the minute wheel Due to the shafts, between which a splined connection is installed, the inside of the housing is divided into two segments by a partition, against which a spring mechanism ends with a button rests, a rib is fixed between the spring mechanism and the shaft, and bearing units are installed in the partition between the shafts.

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