JPS623683Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration isolating device for a surveying tripod, mainly for precision leveling instruments.

Generally speaking, the locations where first and second order leveling and ground subsidence measurements are performed using a precision leveling instrument are mainly concrete or asphalt roads with relatively high traffic volume, such as national highways and prefectural roads. Therefore, surveying will be carried out while the road surface is constantly vibrating.

However, the tripods conventionally used for this type of surveying are composed of rigid members that are connected to each other, so vibrations from the road surface are transmitted directly to the tripod pedestal, making it difficult to conduct highly accurate surveys. There was a problem with becoming.

The present invention was made to solve the above problem, and even if there is vibration on the road surface, by absorbing the vibration at the position of the legs, the transmission of vibration to the upper side is suppressed. The object of the present invention is to provide a vibration isolating device for a surveying tripod that enables highly accurate surveying.

Embodiments of the present invention will be described below based on the drawings.

First, to explain the configuration, as shown in FIG. 1 and FIG.
In each of the three-sided recesses 1b of the metal pedestal 1, which has a tightening part 1a for supporting the tripod, support shafts 2a are horizontally symmetrical on both sides of the head in order to attach the legs A of the tripod. The torso below the head is a chamber with an opening at the bottom, and has a leg chamber 2b whose outer periphery is covered by semicircular arc vertical walls on both sides and linear flat vertical walls at the front and back. , and the leg support 2 is made of metal and has a bolt hole 2c in the center top of the leg chamber 2b.The support shafts 2a on both sides are fitted into the tightening portions 1a on each side, and the support shafts 2a are inserted from below. In a surveying tripod whose upper body is constructed by bolting from below to a fastener 18 that fits and contacts the lower surface of each fastening part 1a for support, the leg support is The leg A, whose head is inserted and fixed into the leg chamber 2b of the tool 2 and supports the base 1 from three sides, is constructed as follows.

As shown in Figs. 1 to 3, the leg A is
In order to maintain high accuracy, the main structure is made of two round wooden legs 3A and 3B of the same length, which are relatively unaffected by changes in the weather environment such as temperature and humidity and can maintain their original shape.
The head sides of A and 3B are spread apart to a width that allows them to be inserted into the leg support 2, and the lower sides are joined in a tight fit.
A ferrule 12 with a footplate 13 is fitted to the tip of the ferrule.

On the inside surface in the longitudinal direction of the legs 3A and 3B, which are opened in a V-shape with a wider space between the heads, there are multiple locations at the same height on both sides, which are the positions that divide the space between the head and the stone abutment 12 into three. Parts B and C shown in Figure 1)
has a fitting hole 3 with a predetermined depth and the same diameter as the hole itself.
3e and 3f are provided facing each other in a horizontal manner, and in each of the fitting holes 3e and 3f, as shown in FIG. The plates 7 are individually fitted.

Upper B of the left and right fitting holes 3e and 3f according to this aspect
At this position, there is a crosspiece 5A in the shape of a round bar of the same quality and diameter as both leg beams 3A and 3B, whose length is the distance between the holes.
is inserted so that its both ends abut against the cushioning rubber plate 7 in the hole, and is connected to both legs 3A, 3B in a cushioning manner by inserting and tightening wood screws 10 from both sides from outside.

Similarly, in the positions of the left and right fitting holes 3e and 3f of the lower C section, crossbars 5B having the same quality and diameter as the previous ones, and having a length extending between the holes, are inserted in the same manner.
Similarly, they are connected in a buffer manner by tightening wood screws 10.

Furthermore, a cushioning rubber cap 9 shown in FIG. 7 having a shape sufficient to cover the circumferential surface of the head including the top surface is tightly fitted to the head of the legs 3A, 3B.

Note that 14 is a piece whose inner surface is formed into an arcuate surface that matches the diameter of the buffer rubber cap 9 when it is tightened, and whose outer surface is formed into a tapered surface with a thinner wall at the bottom and a thicker wall at the top. , 15 is disposed between the two pieces 14 and is formed into a trapezoid shape with tapered surfaces at the same angle on both sides in order to press each piece 14 in the left and right direction, and a bolt hole is provided in the center. It's a wedge.

Next, the action will be explained.

The leg body A having the above-mentioned structure is placed inside the leg holder 2 which is swingably installed vertically in the three-sided recess 1b of the base 1, and is attached to the outside of each buffer rubber cap 9 as shown in FIGS. 6 and 8. Insert the rubber caps 9 so that their vertical surfaces are in contact with the arc vertical wall surfaces on both sides of the leg chamber 2b.
The two pieces 14 are fitted in the leg chamber 2b between them so as to come into contact with the rubber caps 9 on each side, and then a wedge 15 is fitted between the two pieces 14, and a bolt 16 is inserted from below. When the wedge 15 is moved upward by inserting the screw and tightening the nut 17 at the upper bolt hole 2c position, both leg pieces 3 of the leg body A are
A, 3B can be connected to the leg support 2 via the rubber cap 9 in a cushioning manner.

When performing a survey with a precision level placed and fixed on the pedestal 1 of the tripod, if the location is a concrete or asphalt road with relatively high traffic volume, such as a national highway or prefectural road, and the road surface is constantly vibrating. Even if the
A and 3B are connected in a cushioning manner through a rubber plate 7, and the head is also connected in a cushioning manner through a rubber cap 9, so that the vibration can be smoothly and easily transferred to the position of the leg body A. Since the vibration can be damped by the upper part, transmission of vibration to the upper side can be reliably suppressed.

4 and 5 show other embodiments of the present invention.

Wooden double leg trees 4A and 4B in this example
In this case, a horizontally long elliptical buffer rubber plate 8 of a predetermined thickness is directly attached to the inner surface of the middle portions B and C using an adhesive or the like, and the upper B portion between the two buffer rubber plates 8 is is in the shape of a round bar with the same quality and diameter as both leg trees 4A and 4B, and both ends are formed into hollowed-out circular arc surfaces that can be brought into close contact with the surface periphery of the cushioning rubber plate 8, and between the rubber plates 8, A crossbar 6A having a length is bonded to both rubber plates 8 by applying adhesive at both ends, and is further coupled to both leg pieces 4A and 4B in a buffer manner by inserting and tightening wood screws 11 from both sides from the outside. There is.

Similarly, between the left and right rubber plates 8 of the lower C section, a round bar of the same quality and diameter as above is formed, with both ends hollowed out and formed into an arc surface as described above, and a cross member whose length is defined by the space between the rubber plates 8. 6B is similarly bonded and connected to both leg wood 4A, 4B in a buffer manner by tightening wood screws 11 from both sides from outside.

Further, the head portions of the two legs 4A, 4B are covered with cushioning rubber caps 9 shown in FIG. 7, as in the previous embodiment.

As a result, both leg pieces 4A and 4B are inserted into the leg holder 2 in the same manner as described above, and the pieces 14 are brought into contact with the wedge 1.
5 and tightening the bolt by fitting the wedge 1.
By moving the legs 5 upward, both leg bars 4A, 4B can be connected to the leg support 2 via the rubber caps 9 in a cushioning manner. are coupled in a buffering manner via the rubber plate 8, so that vibrations from the road surface can be smoothly and easily damped at the head and midway portions of the legs, thereby reliably suppressing transmission of vibrations to the upper side. be able to.

As explained above, the present invention combines both leg pieces and reinforcing cross pieces placed at intermediate positions between them into a leg body by connecting them via a cushioning rubber plate, and the head of both leg pieces. By covering the parts with cushioning rubber caps, the coupling and connection between the members by the rigid body is eliminated, and the vibrations on the road surface are buffered at the position of the legs, and are transmitted to the upper part. Since this can be suppressed, it is possible to perform highly accurate surveying on the pedestal 1, which has the effect of improving surveying technology.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a surveying tripod equipped with a vibration isolator according to the present invention, and Figure 2 is a partial longitudinal section showing the first embodiment of the vibration isolator according to the present invention in sections B and C of Figure 1. The front view, Figure 3 is a perspective view showing the internal structure at the same position, and the fitting and cushioning rubber plate at the same position.
The figure is a partially cross-sectional plan view showing the second embodiment of the vibration isolator of the present invention in parts B and C of Fig. 1, and Fig. 5 shows the cushioning rubber plate attached at the same position and the cushioning rubber plate before attachment. FIG. 6 is a partially longitudinal front view showing how the legs with shock-absorbing rubber caps attached to the heads are connected to the leg supports placed under the pedestal, and FIG. 7 is the same as that shown in FIG. 6. FIG. 8 is a perspective view of the buffer rubber cap, and FIG. 8 is a cross-sectional plan view taken along line D--D in FIG. 6. Explanation of symbols, 1...Pedestal, 1a...Tightening part, 1
b...Three-sided recess, 2...Leg holder, 2a...Spindle,
2b... Leg chamber, 2c... Bolt hole, 3A, 3
B, 4A, 4B... Leg wood, 3e, 3f... Fitting hole, 5A, 5B, 6A, 6B... Cross bar, 7, 8...
...Buffer rubber plate, 9...Buffer rubber cap, 10,
11... Wood screw, 12... Stone butt, 13... Step board, 14... Top, 15... Wedge, 16... Bolt, 17... Nut, 18... Fastener, A...
Legs.

Claims (1)

[Scope of utility model registration request] A tripod for surveying, characterized in that both legs of the leg body are vertically hung from the pedestal so that they can be opened, and reinforcing crossbars placed at intermediate positions between the legs are connected via a buffer rubber plate. Anti-vibration device.