WO1997029344A1

WO1997029344A1 - A device for fixing geodesic devices

Info

Publication number: WO1997029344A1
Application number: PCT/PL1997/000003
Authority: WO
Inventors: Zbigniew Czerski
Original assignee: Zbigniew Czerski
Priority date: 1996-02-12
Filing date: 1997-02-10
Publication date: 1997-08-14

Abstract

A device for fixing geodesic instruments has the counterweight (10) connected by means of an arm with the telescope clamp (11). Said counterweight (10) is adapted to ensure the static balance of the device and is shaped as a cylindrical sector.

Description

A device for fixing geodesic devices

An object of the invention additional to the main in¬ vention No P 312771 is a statically balanced device for fixing geodesic devices, especially a stadia, at a tele¬ scope of a theodolite or other devices. It is designed mainly for fastening an electrooptical stadia at telescopes of geodesic instruments provided with inclined telescopes, as for example optical, mechanical and electronic theodolites. That device is fastened to a telescope of a theodolite or to another device by means of a clamping ring mounted at an outer objective ring.

From the main invention No P 312771 there is known a method for fixing geodesic instruments and a device for fixing geodesic devices by said method. The device has a base with an annular clamp for the telescope. Above the base there is located a horizontally and vertically rota¬ tional control plate with a fixing pin and a face recess receiving a screw controlling its vertical position. In a side wall of the base there is located a screw to control its horizontal position. On the control plate there is ver- tically mounted a frame holder comprising a swinging and rotationally mounted latch plate with a catch and a stop plate.

The device for fastening geodesic devices according to the present -invention is characterised by that it has a counterweight enabling the device to be statically bal¬ anced in such a way that an axis of a clamp for a telescope of an instrument supported with its side cylindrical sur¬ face on a horizontal plate is positioned horizontally. The counterweight is a symmetrical cylindrical sector. The counterweight is located in the device in opposition to the telescope clamp and is connected with it by means of an arm extending from the lower part of a telescope clamp and par¬ allel to its axis. The arm is shaped as an uneven-arm an¬ gle, the longer arm of which being horizontal, and the ver¬ tical, shorter one being connected to the counterweight in such a way that the arm forms an acute angle with symmetry axis of a cylindrical sector and is fastened to one of cyl¬ inder bases. The cylindrical sector forming the counter¬ weight is determined by vertical sections in planes cutting both cylinder bases along the cords of these bases which do not run through their centres. An obtuse apex angle of those cords is a linear angle in a dihedral angle between the obtained in this way upper surfaces of the cylindrical sector forming the counterweight. The advantageous techni¬ cal results of the device for fixing geodesic devices ac¬ cording to the present invention rely on providing the pos¬ sibilities to obtain the parallelism between a measuring beam in an electrooptical stadia and a telescope axis in a - 3 -

geodesic instrument thanks to the precise inclination con^¬ trol separately in the horizontal plane and in the vertical one by means of a screw controlling the horizontal position and another screw controlling the vertical position. The stable pos ti-on of an optical instrument is provided be¬ cause the device is statically balanced.

The device for fixing geodesic devices according to the present invention is illustrated in an example in the enclosed drawing where it is shown in a perspective view.

Above the base 1 there is located the control plate 2 rotational in the horizontal and vertical direction to¬ gether with the fixing pin 5 and with the face recess re¬ ceiving the vertical deviation control screw with the knob 4. In the side wall of the base 1 there is located the horizontal deviation control screw 3. On the control plate 2 there is mounted the frame holder 12 comprising the latch plate 6 with the catch 7, as well as the stop plate 8. The telescope clamp 11 of the device to be fastened on the theodolite telescope or other devices has the counterweight 10 connected with clamp 11 by means of the arm, and de¬ signed to ensure the statical balance of the inclined tele¬ scope of the geodesic instrument with the fastened elec¬ trooptical stadia.

The device has the counterweight 10 being a symmetri¬ cal cylindrical sector. The counterweight 10 of the device ensures its statical balance in such a way that the axis of the telescope clamp 11 of the device supported by the side cylindrical surface on the horizontal surface is positioned horizontally. The counterweight 10 is located in the device - 4 -

in opposition to the telescope clamp 11 and is connected with it by the arm extending from the lower part of the telescope clamp 11, said arm being parallel to its axis, and has a shape of an uneven-arm angle, the longer arm of which is horizontal and the vertical, shorter one is con¬ nected to the counterweight 10 in such a way that said arm creates an acute angle with the symmetry axis of the cy¬ lindrical sector. The arm is fastened to one of its bases. The cylindrical sector forming the counterweight 10 is de¬ termined by cutting the cylinder with vertical planes going through its basis along their cords that do not run through their centres. An obtuse apex angle between those cords is an linear angle in the dihedral angle created between the obtained in this way upper planes of the cylindrical sec¬ tor forming the counterweight 10.

The device is to be fastened on a telescope of a theodolite or another device with the clamp 11 mounted on the outer ring and clamped with the clamping screw 9.

A stadia is to be fastened with the latch plate at the upper part of the device. Afterwards, the parallelism of the measuring beam of the electrooptical stadia and the target axis of the telescope in the geodesic instrument should be achieved by precisely regulating the horizontal position by means of the control screw 3 and the vertical one by means with the control screw 4.

Claims

A device for fastening geodesic devices, comprising a base, above which there is positioned a horizontally and vertically rotational control plate having a fixing pin and a face recess for receiving a screw with a knob to control the vertical deviation, whereas in a side wall of the base there is positioned a screw with a knob controlling the horizontal deviation, and a frame holder is mounted verti¬ cally on the control plate, according to the main patent No P- 312771, characterised by that it has a counterweight (10), being a cylindrical sector, ensuring the statical balance of said device in such a way that an axis of clamp (11) for the telescope of said device supported by a side surface of the cylinder on a horizontal plane is positioned horizontally, said counterweight (10) being positioned in said device in opposition to the telescope clamp (11) and connected with it by an arm extending from the lower part of the telescope clamp (11), and parallel to its axis, said arm being shaped as an uneven-arm angle, the longer arm of which is horizontal, and the shorter, vertical one is con¬ nected to the counterweight (10) so that said arm creates an acute angle with the symmetry axis of the cylindrical section, and is fastened to one of its bases, said cylin¬ drical section, being the counterweight (10), being deter¬ mined by vertically cutting a cylinder with planes running across cylinder bases along their cords, which do not run through their centres, whereas an obtuse apex angle of said cords being a linear angle of a dihedral angle created be¬ tween the obtained in this way planes of the cylindrical sector forming the counterweight (10).