JPH069298Y2 - Clamping device such as surveying instrument on leveling table - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is an apparatus for fixing a target such as a surveying instrument body or a reflecting mirror (hereinafter collectively referred to as surveying instrument, etc.) to a leveling table. In particular, a surveying instrument in a leveling platform that connects the surveying instrument and the leveling platform by clamping the clamp leg of the surveying instrument, etc., inserted through the clamp leg insertion hole formed on the upper plate of the leveling platform Of the clamp device.

[Prior art]

As shown in FIG. 10, the leveling table 1 has a structure in which an upper panel 6 is connected and supported on a lower panel 2 via three leveling screws 4. For example, when performing a traverse survey or the like, the surveying instrument main body 8 is mounted and fixed and the surveying is performed while exchanging the target.

FIG. 11 is a bottom view of the leveling platform as viewed from a position along the line XI-XI in FIG. 10. The upper plate 6 is provided with three holes 6a, and the holes 6a are clamped to the body 8 of the surveying instrument. The leg 7 is inserted. The insides of the three clamp legs 7 are notched as indicated by reference numeral 7a, and the claws 11 of the clamp plate 10 rotatably assembled to the lower surface of the upper plate 6 engage with the notches 7a. Together, the clamp legs 7 are clamped to the upper plate 6. A crank shaft 14, which is a rotation operation lever that rotates integrally with the clamp knob 12, is provided on the outer wall 6b of the upper plate 6, and a resin piece (slider) 16 is provided at the arm tip of the crank shaft 14. Is pivotally attached.

A clamp arm mechanism 18, which is a power transmission mechanism that transmits the rotational force on the crankshaft side to the clamp plate side, is provided between the clamp plate 10 and the crankshaft 14. The clamp arm mechanism 18 includes a fixed arm 20 fixed to the clamp plate 10 and a movable arm 22 opposed to the fixed arm 20, and the piece 16 is horizontally moved by the both arms 20 and 22. Both arms are held while being clamped.
It can slide relative to 0 and 22 in the vertical direction of FIG. 12 (direction perpendicular to the paper surface of FIG. 11). Movable arm 2
A pin 23 is screwed to the pin 2, and a compression coil spring 24 is interposed between the pin head 23a and the fixed arm 20 to bias the movable arm 22 toward the fixed arm 20.

Then, as shown by the arrow in FIG. 10, the clamp knob 1
When 2 is rotated, the crankshaft 14 rotates together with the knob 12, and the piece 16 moves along the axis L as shown by the arrow in FIG.
Rotate around ₁ . Fig. 11 (a) shows the clamp knob 1
The state before turning 2 is shown, and reference numeral 16A in FIG.
16B-> 16C have shown the locus | trajectory which the piece 16 moves with the rotation operation of the clamp knob 12. As shown in FIG. And piece 16
Is clamped horizontally by the clamp arm mechanism 18, and is supported slidably in the vertical direction (vertical direction in FIG. 12) with respect to the arms 20, 22.
As shown by the phantom line in the figure, the piece 16 has both arms 20, 2
While sliding vertically between the two, the side surface of the movable arm 22 is pushed leftward in FIG. 12, and the clamp arm mechanism 18 and the clamp plate 10 rotate integrally. Then, the claw 11 engages with the notch 7 a of the clamp leg 7, the clamp leg 7 of the surveying instrument body 8 is clamped by the clamp plate 10, and the surveying instrument body 8 is fixed to the leveling table 1. FIG. 11B shows a state in which the piece 16 is in the position shown in FIG. 12 at reference numeral 16C, and the claw 11 engages with the notch 7a and the piece 16 presses the side surface of the movable arm 22. Thus, the spring force is applied to the clamp portion via the clamp plate 10, and the clamp leg 7
Are clamped by the clamp plate 10.

[Problems to be solved by the invention]

When surveying, the surveying instrument main body is fixed to the leveling platform, and the leveling platform is mounted and fixed on a tripod, but work such as rotating the surveying instrument or operating the coarse / fine adjustment knobs is performed. Even when inside or some other external force is applied,
It is desirable that the surveying instrument main unit be fixed so that it does not move at all with respect to the leveling table.

However, the clamp leg 7 and the leveling table 1 on the surveying instrument body 8 side
A clearance d is formed as a play between the side clamp leg insertion hole 6a to ensure smooth insertion of the clamp leg, as shown in FIG. Therefore, when a large torque is applied to the clamp portion after the clamp leg 7 is clamped by the clamp plate 10, there is a problem that the clamp leg 7 and the clamp plate 10 rotate relative to each other by an amount corresponding to this play. .

Considering the force acting on the clamp leg and the clamp portion of the clamp plate, this is in addition to the frictional force F acting between the claw 11 and the notch 7a of the clamp leg, as shown in FIG. A spring biasing force f of the compression coil spring 24 is added. Then, when an external force of F + f or more is applied in the direction in which the clamping force is increased (the direction in which the clamp leg is moved in the A direction by considering the clamp plate as fixed), the direction in which the clamp is released (the clamp plate is considered as fixed) It can be considered that each of the clamp legs rotates with respect to the clamp plate when an external force equal to or greater than F−f acts in the direction in which the clamp legs are moved in the B direction). And this drag is small (F-f <F
F on the + f) side, that is, in the direction to release the clamp (direction B)
When a large external force of -f or more is applied, the clamp leg 6 rotates with respect to the clamp plate 10 by an amount corresponding to the gap between the clamp leg 6 and the peripheral portion of the hole.

For this reason, if the clamp leg side deviates from the clamp plate after being clamped once, it may lead to a problem that the reference position of the surveying instrument must be reset.

The present invention has been made in view of the above-mentioned problems of the prior art,
An object of the present invention is to provide a clamp device for a surveying instrument or the like on a leveling table, which can reliably clamp the surveying instrument or the like on the leveling table.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, in a clamping device such as a surveying instrument in a leveling table according to the present invention, a clamp plate mounted on a lower surface of an upper plate of the leveling table is rotated by a rotation operation lever to clamp the clamp plate. Clamp the surveying instrument etc. on the leveling table by engaging the plate side claw with the claw engaging part of the clamp leg of the surveying instrument etc. which is inserted into the clamp prepreg insertion hole of the upper plate and clamping the clamp leg with the clamp plate. In the device, an eccentric cam that interlocks with the rotation operation lever and a cam surface of the eccentric cam that swings in a horizontal direction and is pushed by the clamp plate before the clamp leg is clamped by the clamp plate. Clamp leg consisting of a clamp leg side surface pushing member pressed against the peripheral edge of the clamp leg insertion hole on the clamp direction side. Is obtained so as to comprise a surface positioning mechanism.

[Action]

The clamp leg in the clamp leg insertion hole is in a state of being pressed against the peripheral edge of the clamp leg insertion hole on the clamp direction side by the clamp plate by the clamp leg side surface pushing member of the clamp leg side surface positioning mechanism,
In this state, it is clamped by the clamp plate. Therefore, since the side of the clamp leg in the clamp direction by the clamp plate is in contact with the peripheral edge of the clamp leg insertion hole, there is no movement space even when the clamp leg moves in the direction to release the clamp, and the clamp leg cannot be clamped by the clamp plate. Be certain.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

1 to 9 are views showing an embodiment of the present invention. FIG. 1 is a perspective view of a leveling table in which a clamp device is incorporated, and FIGS. 2 and 3 are views of the leveling table, respectively. FIG. 11 is a bottom view corresponding to FIGS. 11A and 11B of the prior art, FIG. 4 is an enlarged exploded perspective view of the clamp arm mechanism, and FIG.
FIG. 6 (a) is a perspective view for explaining the operation of the clamp leg side surface positioning mechanism as viewed from the bottom surface side, and FIG. 6 (a).
(C) is an operation explanatory view of the pushing member, FIGS. 7 and 8 are operation explanatory views of the clamp arm mechanism, and FIG. 9 is an operation explanatory view of the clamp arm mechanism and the clamp leg side surface positioning mechanism.

In the embodiment described below, except for the clamp arm mechanism and the clamp leg side surface positioning mechanism, the structure is substantially the same as that of the conventional leveling table shown in FIGS. 10 to 13, and the same as the conventional leveling table. The parts are denoted by the same reference numerals, and the duplicated description will be omitted.

In these figures, reference numeral 30 is a clamp arm mechanism as a power transmission mechanism for transmitting the rotational force of the crankshaft 14 which is a rotation operation lever to the clamp plate side, and is an L-shaped fixed arm fixed to the clamp plate 10. 32
And a movable arm 34 rotatably supported by the clamp plate 10.

FIG. 4 is an exploded view of the clamp arm mechanism as seen from the bottom side. In the movable arm 34, an L-shaped arm portion 36 facing the fixed arm 32 is projectingly provided on the cylindrical body 35, and an L-shaped arm portion is formed by a torsion coil spring 38. The arm portion 36 is configured to be rotationally biased toward the fixed arm 32 side. Reference numeral 40 is a pin that is a pivotal support shaft of the movable arm 34, and is a metal collar 42.
It is inserted inside and is screwed to the back surface of the clamp plate 10. The torsion coil spring 38 is arranged so as to circulate around the collar 42, and is twisted in a state in which an initial stress is generated in advance, so that the spring ends 38 a and 38 b have the holes 39 a and 39 b of the movable arm 34 and the clamp plate 10. It is fixed to each. Reference numeral 41 is the clamp plate 10.
It is a screw hole for screwing the pin 40 formed in the.

Reference numeral 37 is a notch formed on the piece supporting surface (sliding surface) of the L-shaped arm portion 36, and the claw 11 locks the clamp leg 7 of the surveying instrument inserted into the clamp leg insertion hole 6a of the clamp plate 10. Then, the rectangular piece 16 enters the notch 37, and the downward sliding of the piece 16 is suppressed,
Reverse rotation of the crankshaft 14 is prevented.
That is, once the claws 11 on the side of the clamp plate are engaged with the notches 7a of the clamp legs and the clamp legs 7 are clamped, the clamps will be clamped unless the claws 11A disengage the claws 11 from the notches 7a. It can't be solved. Therefore, the connection between the surveying instrument body and the leveling table will not be released even if an unexpected external force is applied, such as when the surveying instrument body 8 or the leveling table is hit by an object.

The claw 11 of the clamp plate 10 has a wedge surface 1 whose tip is thin toward the outside in the radial direction and in the direction in which the clamp leg 7 is clamped (the direction of the arrow in FIG. 4).
1a is formed. When the clamp knob 12A is rotated clockwise, the bridge 16 and the clamp arm mechanism 3
By the action of 0, the clamp plate 10 rotates in the direction of the white arrow in FIG. 4, the wedge surface 11a of the claw 11 engages with the notch 7a of the clamp leg 7, and clamps the clamp leg 7.

Also, as shown in FIG. 5 (a), the clamp knob 1
An eccentric cam 50 is mounted on the shaft 2a of the crankshaft 14 and the shaft 2a. On the other hand, a pushing plate 60, which is a pushing member, is assembled between the upper plate 6 and the clamp plate 10 so as to be horizontally swingable. The pushing plate 60 has a fan-shaped plate body 60a, and a part of the outer peripheral edge portion of the plate body 60a projects outward in the radial direction.
A cam accommodating portion 63 is formed on the outward projecting portion 60b by a pair of standing walls 62a and 62b which stand up substantially vertically in FIG. 5 (downward in a normal state). The outer peripheral surface of the cam is just standing walls 62a and 62b.
So as to be inscribed in the cam housing 63.
0 is accommodated and arranged.

A clamp leg pushing portion 66 is formed on the outer peripheral edge side of the side edge portion of the plate body 60a so as to correspond to the clamp leg insertion hole 6a. The eccentric relationship between the rotation support shaft 14a of the eccentric cam 50 and the outer peripheral surface of the cam is such that the cam body 50a has three apex portions close to a triangle, and the claw 11 of the clamp plate 10 is formed in the notch 7a of the clamp leg. Before engagement, as shown in FIG. 5 (b), the longest radius outer peripheral surface 50b of the eccentric cam presses the standing wall 62a, which causes the pushing plate 60 to swing in the direction of the arrow and push the pushing portion. 6
6 protrudes into the clamp leg insertion hole 6a, and the side surface of the clamp leg 7 is pressed against the hole peripheral portion 6a ₁ of the clamp plate 10 on the clamp direction side.

That is, the eccentric cam 50 and the pushing plate 60 that swings in conjunction with the eccentric cam 50 and presses the clamp leg 7 against the hole side edge portion 6a ₁ constitute the side surface positioning mechanism 49 of the clamp leg.

Next, a procedure for the clamp plate 10 to clamp the clamp leg 7 will be described with reference to FIGS. 2, 3, and 5 to 9.

2 and 5 (a) and 7 show the clamp knob 1
2A shows a state before the turning operation of 2A, and a clamp leg 7 such as a surveying instrument is inserted into the clamp leg insertion hole 6a of the upper plate 6 of the leveling table. And clamp 12
The A clockwise (FIG. 2, FIG. 5 (a), FIG. 7 arrow C) when the rotating crank shaft 14 around the axis L ₁ of arrow D ₁ direction (FIG. 5 (a), (See FIG. 7). The piece 16 is pivotally attached to the crankshaft and is rotatable,
Further, since the piece 16 and both arms 32, 34 are clamped by the arms 32, 34 of the clamp arm mechanism 30 and can vertically slide relative to each other, the piece 16 moves downward along the side surface of the L-shaped arm portion 36 of the movable arm 34. The movable arm 34 is pushed in the direction of arrow E _{1 in} FIG. Therefore, the clamp plate 10 rotates in the direction shown by the arrow E in FIGS. 2 and 5 (a). The position shown by the phantom line in FIG. 7 shows the position where the clamp knob 12A is rotated 90 degrees.

On the other hand, the vertical walls 62 a and 62 b of the push-push plate 60 in the clamp leg side surface positioning mechanism 49 are provided with the rotary knob 12.
Until A reaches a predetermined rotation position after the rotation angle of 90 degrees, it is not affected by the eccentric cam 50, and the pushing plate 60 does not swing yet, as shown in FIG. 6 (a). Push member 6
The push-down portion 66 of 0 does not project into the clamp leg insertion hole 6a.

Further, when the clamp knob 12A is further rotated in the same direction, the piece 16 rotates as shown by the reference symbol F in FIG. 8 and slides upward along the side surface of the L-shaped arm portion 36, so that the L-shaped arm portion 3 is formed.
6 (movable arm 34) is pushed in the direction of arrow E _{2 in} FIG. Therefore, the clamp plate 10 further rotates in the same direction,
The wedge surface 11a of the claw 11 is just engaged with the notch 7a of the clamp leg. The position shown by the solid line in FIG. 8 is just the position where the wedge surface 11a of the claw and the notch 7a are engaged.

On the other hand, in the clamp leg side surface positioning mechanism 49, the longest radius outer peripheral surface 50b of the eccentric cam presses the standing wall 62a from the position where the rotary knob 12A is rotated by approximately 90 degrees. As a result, the pushing plate 60 rotates in the direction of the white arrow shown in FIG. 5 (b), and the pushing portion 66 projects into the clamp leg insertion hole 6a as shown in FIG. 6 (b). As shown in (c) and FIG. 9, the side surface 7b of the clamp leg 7 is pushed and pressed against the hole peripheral edge portion 6a ₁ on the opposite side. The piece 1 shown in FIG. 5 (b) and FIG.
The position 6 indicates a state in which the pushing plate 60 is in the most advanced position. Thereafter, even if the clamp knob 12A is further rotated, the turning radius of the cam outer peripheral surface 50b is constant, and the clamp leg 7 is It is held in a pressed state to the hole periphery 6a ₁ by a constant urging force by the plate spring action of the vertical wall 62a. Note that FIG. 9 shows a state in which the clamp leg 7 is pressed against the hole peripheral portion 6a ₁ by the push plate 60.

Then, when the clamp knob 12A is further rotated, in the clamp arm mechanism 30, since the claw 11 is engaged with the notch 7a, the fixed arm 32 cannot rotate any further.
However piece 16 so is rotated by the torque to overcome the spring force of the torsion coil spring 38, only the movable arm 34 is pressed by the piece 16, the eighth pin 40 as shown in FIG arrow E ₂ (FIG. 3, (See FIG. 4), the piece 16 is fitted into the notch 37 of the L-shaped arm portion 36, and the clamp leg 7 is completely clamped by the clamp plate 10.

At this time, the wedge surface 11a of the pawl 11 is pressed against the notch 7a of the clamp leg by the torque generated by the spring force of the torsion coil spring 38 acting on the movable arm 34, as shown by an arrow G in FIG. Therefore, the notch 7a of the clamp leg is securely clamped by the wedge action of the wedge surface 11a. In particular, as shown by the phantom line in FIG. 8, during the engaging operation of pressing the pawl 11 into the notch 7a by applying the spring force of the movable arm, the clamp leg 7 is moved by the side surface positioning mechanism 49 to the peripheral edge portion 6a of the clamp leg insertion hole. _It is pressed against ₁ . Therefore, even if a large external force acts on the clamp portion of this clamp leg and the clamp leg 7 tries to move in the direction to release the clamp, there is no space for movement, and the clamp plate 10 does not move.
There is no problem that the clamp parts are displaced from each other after clamping the. Further, the piece 16 is fitted in the notch 37 of the L-shaped arm portion 36 and cannot be easily removed from here, but if the clamp knob 12A is turned counterclockwise, the piece 16 can be easily removed from the notch 37. It can be removed to release the clamp on the clamp leg 7.

In FIG. 1, reference numeral 3 is a notch formed on the side surface of the lower platen 2 of the leveling table, which functions as a finger pad for positioning the leveling table on the tripod. Very convenient to slide on. Reference numeral 5 is a circular bubble tube.

Further, the clamp knob 12A has a rectangular cross section (see FIG. 10) in the related art, but has a triangular shape in the present embodiment, and since it is difficult to slip, it is very useful when it rains. It is convenient. Further clamp clamp 12
Since A is vertically asymmetrical, whether or not the claw 11 closes the clamp leg insertion hole 6a, that is, whether the clamp leg 7 of the surveying instrument or the like can be inserted into the clamp leg insertion hole 6a, or the clamp leg When the clamp leg 7 is inserted into the insertion hole 6a, there is also an advantage that it can be seen at a glance whether or not the clamp leg 7 is clamped by the clamp plate 10.

Further, in the above-described embodiment, the piece 16 is described as a slider made of resin, but the piece 16 may be a circular rolling element, and the material may be plastic, hard rubber or metal. When the piece 16 is a rolling element, the piece 16 and the arms 32, 3
Since the friction between 4 is extremely small, the clamp leg 7
Clamp operation becomes smoother.

Furthermore, in the above-described embodiment, the clamp arm mechanism 30 that transmits the rotational force on the rotation operation lever side to the clamp arm side.
As a movable arm urging means in
However, a conventional clamp arm mechanism using a compression coil spring may be used.

[Effect of device]

As is clear from the above description, in the clamp device such as the surveying instrument in the leveling table according to the present invention, the eccentric cam that interlocks with the rotation operation lever and the eccentric cam that is pushed by the cam surface to move horizontally. A clamp leg side surface locating mechanism including a clamp leg side surface pushing member that swings and presses the clamp leg against the peripheral edge of the clamp leg insertion hole on the clamp direction side by the clamp plate before the clamp leg is clamped by the clamp plate Therefore, the clamp leg in the clamp leg insertion hole of the upper plate of the leveling table is in a state of being pressed by the clamp leg side surface pushing member to the peripheral edge portion of the clamp leg insertion hole on the clamp direction side of the clamp plate, In this state, it is clamped by the clamp plate. Therefore, the side of the clamp leg on the side of the clamp plate by the clamp plate is in contact with the peripheral edge of the clamp leg insertion hole, and there is no movement space even when the clamp leg moves in the direction to release the clamp. There is no slippage between the clamp leg insertion hole and the clamp leg can be reliably clamped.

[Brief description of drawings]

FIG. 1 is a perspective view of a leveling table showing an embodiment of the present invention, and FIG.
The drawings and FIG. 3 are bottom views for explaining the operation of the clamp device, FIG. 4 is an exploded perspective view of the clamp arm mechanism, and FIGS. 5 (a) to 5 (c) are operation explanatory views of the clamp leg side surface positioning mechanism, 6 (a) to 6 (c) are operation explanatory views of the pushing plate, FIGS. 7 and 8 are operation explanatory views of the clamp arm mechanism, and FIG. 9 is operation of the clamp arm mechanism and the clamp leg side surface positioning mechanism. Explanatory drawing, FIG. 10 is a front view in which the main body of the surveying instrument is placed on a conventional leveling table, and FIGS. 11 (a) and 11 (b) are operation explanatory views of the conventional clamping device (line shown in FIG. 10). XI-XI sectional view), twelfth
FIG. 13 is an operation explanatory view of a conventional clamp arm mechanism, and FIG. 13 is a bottom view of the clamp leg insertion hole and its periphery in cross section showing the clamp leg. 6 ... Upper plate of leveling table, 6a ... Clamp leg insertion hole, 7 ... Clamp leg of surveying instrument, 7a ... Notch, 10 ... Clamp plate, 11 ... Claw, 12A ... Clamp pick , 14 ... Crank shaft which is a rotary operation lever, 16 ... Piece, 30 ... Clamp arm mechanism which is a power transmission mechanism, 49 ... Clamp leg side surface positioning mechanism, 50 ... Eccentric cam, 60 ... Push plate , 63 ... Cam accommodating section, 66 ... Pushing section,

Claims (1)

[Scope of utility model registration request] 1. A surveying instrument or the like in which a clamp plate assembled to the lower surface of the upper plate of the leveling table is rotated by a rotation operation lever, and a claw on the side of the clamp plate is inserted into a clamp leg insertion hole of the upper plate. In a clamping device such as a surveying instrument in a leveling table that engages with a claw engaging portion of a clamp leg and clamps the clamp leg with a clamp plate, an eccentric cam that interlocks with the rotation operation lever and a cam of the eccentric cam. A leg side surface pushing member that pushes the clamp leg against the peripheral edge portion of the clamp leg insertion hole on the clamp direction side by the clamp plate before the clamp leg is clamped by the clamp plate. A clamp device for a surveying instrument or the like in a leveling table, which is provided with a clamp leg side surface positioning mechanism.