JPH069299Y2 - 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. 7, the leveling table 1 is mounted on the lower plate 2 by 3
The upper plate 6 is connected and supported via the leveling screws 4, and on the leveling table 1, for example, the surveying instrument main body 8
It is designed to be mounted and fixed for surveying.

FIG. 8 is a bottom view of the leveling platform as seen from a position along the line XIII-XIII in FIG. 7. 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 (direction perpendicular to the paper surface of FIG. 8).

On the movable arm 22, as shown in FIG.
The pin 23 is screwed onto the pin head 23a and the fixed arm 20.
A compression coil spring 24 is interposed between the movable arm 22 and
Is biased toward the fixed arm 20 by a spring. And the seventh
As shown in the figure, when the clamp knob 12 is rotated, the crank shaft 14 is rotated integrally with the knob 12, and the piece 16 is rotated.
Rotates about the axis L ₁ as shown by the arrow in FIG.

FIG. 8 (a) shows a state before turning the clamp knob 12, and reference numerals 16A → 16B → 16C in FIG. 10 show a locus of movement of the piece 16 by the rotation operation of the clamp knob 12. . The piece 16 is a clamp arm mechanism 18
Clamped horizontally by the arms 20, 2
2 is supported so as to be slidable relative to each other in the vertical direction (vertical direction in FIG. 10), so that the piece 16 slides vertically between both arms 20, 22 as shown by the phantom line in FIG. Then, since the movable arm 22 is pushed, the clamp arm mechanism 18 and the clamp plate 10 rotate integrally. Then, the claw 11 engages with the notch 7a of the clamp leg 7, and the clamp leg 7 of the surveying instrument main body 8 causes the clamp plate 10 to move.
The surveying instrument main body 8 is fixed to the leveling table 1 by being clamped by. In FIG. 8 (b), the piece 16 is shown in FIG.
The state shown in C is shown, in which the clamp leg 7 is clamped by the clamp plate 10.

[Problems to be Solved by the Invention] However, in the clamp arm mechanism 18 described above, as shown in FIG.
The pin 23 is inserted into the pin 4a, and there is a gap d between the pin 23 and the inner peripheral edge of the spring receiver 24a for allowing the movable arm 22 to swing.
The wear at the contact portion between the pin 23 and the spring receiver 24 is severe.
Further, due to this gap d, the swinging fulcrum of the movable arm 22 is not constant, therefore the clamping force of the piece 16 also changes, the sliding friction between the arms 20, 22 and the piece 16 is correspondingly large, and the piece 16 is rapidly reduced. In addition, there is a problem that the rotation torque on the clamp grip side cannot be efficiently transmitted to the clamp plate side.

When the claw 11 is engaged with the notch 7a of the clamp leg, as shown by reference numeral 16C in FIG.
6 presses the movable arm 22 in the direction of separating from the fixed arm 20, but the biased load as shown in FIG. 9 (b) acts on the compression coil spring 24 at this time. ing. That is, it is desirable to apply a uniform force to the compression coil spring 24 in the axial direction.
The compression coil spring 24 of the clamp arm mechanism 18 is
As shown in FIG. (B), the load is biased so that it is in an improperly biased state, and there is a problem in that it is easily worn out by long-term use.

The present invention has been made in view of the above-mentioned problems of the prior art,
The purpose is to improve the clamp arm mechanism, which is a power transmission mechanism that transmits the rotational force on the rotation operation lever side to the clamp plate side, so that the rotational force on the rotation operation side can be transmitted to the clamp plate side without waste. Moreover, it is to provide a clamp device such as a surveying instrument on a leveling table having excellent durability.

[Means for Solving the Problems]

In order to achieve the above object, in a clamping device for a surveying instrument or the like in a leveling table according to the present invention, a hole for inserting a clamp leg of a surveying instrument or the like formed in an upper plate of the leveling table, and the upper plate A clamp plate rotatably assembled to the lower surface of the clamp plate, the clamp plate having a claw engageable with the cutout portion of the leg inserted through the clamp leg insertion hole; And a rotation arm, a fixed arm supported by the clamp plate, and a movable arm that is spring-biased toward the fixed arm and cooperates with the fixed arm to clamp the piece horizontally. A clamp device such as a surveying instrument in a leveling table including a clamp arm mechanism that is a power transmission mechanism that transmits the rotational force on the operation lever side to the clamp plate side. In addition, the torsion coil spring is interposed between the clamp plate and the movable arm so that the movable arm is biased toward the fixed arm.

[Action]

The movable arm is rotationally biased by the torsion coil spring with the support portion as a fulcrum, the clamping force of the bridge is kept constant, and the rotational force of the rotation operation lever side can be efficiently transmitted to the clamp plate side. Moreover, since the load acts on the torsion coil spring over the entire spring, it does not become worn out even if it is used for a long period of time.

〔Example〕

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

1 to 6 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 FIG. 2 is a perspective view of a main part thereof as seen from the bottom side. FIG. 3, FIG. 3 and FIG. 4 are bottom views of the leveling table, and FIG.
5 (b), 5 (a) and 6 (b) are explanatory views for explaining the operation of the clamp arm mechanism.

The embodiment described below is substantially the same as the conventional leveling table shown in FIGS. 7 to 10 except for the clamp arm mechanism, and the same parts as those of the conventional leveling table are designated by the same reference numerals. Therefore, the duplicate 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. 2 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 a 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, 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 connecting portion between the surveying instrument body and the leveling table is not affected.

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 of clamping the clamp leg 7 (the direction of the arrow in FIG. 2).
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. 2, the wedge surface 11a of the claw 11 engages with the notch 7a of the clamp leg 7, and clamps the clamp leg 7.

Next, a procedure for the clamp plate 10 to clamp the clamp leg 7 will be described with reference to FIGS. 3 to 6.
FIGS. 3 and 5 show a state before turning the clamp knob 12A, 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. Then turn the clamp knob 12A clockwise (Fig. 3,
Is rotated in FIG. 5 in the direction of the arrow A), the crank shaft 14 is rotated as shown in Figure 5 reference numeral B ₁ around the axis L _1. The piece 16 is pivotally attached to the crankshaft and is rotatable, and is further clamped by the arms 32 and 34 of the clamp arm mechanism 30. Since the piece 16 and both arms 32 and 34 can vertically slide relative to each other, the piece 16 is The movable arm 34 is slid downward along the side surface of the L-shaped arm portion 36 of the movable arm 34.
5 in the direction of arrow C _{1 in} FIG. Therefore, the clamp plate 10 moves in the direction shown by the arrow D in FIG. 3 (this is indicated by the arrow C in FIG. 5).
It is the same direction as ₁ )). The position shown by the phantom line in FIG. 5 shows the position where the clamp knob 12A is rotated 90 degrees.

When the clamp knob 12A is further rotated in the same direction, the piece 16 rotates as shown by reference numeral B ₂ in FIG. 6, and slides upward along the side surface of the L-shaped arm portion 36, so that the L-shaped arm portion 36. The (movable arm 34) is pushed in the direction of arrow C _{2 in} FIG.
Therefore, the clamp plate 10 is further rotated in the same direction, and the wedge surface 11a of the claw 11 is formed into the notch 7a of the clamp leg.
It will be in the state just engaged with. The position shown by the solid line in FIG.
The position where the wedge surface 11a of the claw and the notch 7a are just engaged is shown. When the clamp knob 12A is further rotated, the claw engages with the notch 7a, so that the fixed arm 3
2 cannot rotate any more. However, since the piece 16 is rotated by the torque that overcomes the spring force of the torsion coil spring 38, only the movable arm 34 is pushed by the piece 16 and rotated around the pin 40 as shown by the arrow C ₂ in FIG. , Piece 1
6 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 claw 11 is moved to the movable arm 3
The notch 7a of the clamp leg is pressed by the torque of the spring force of the torsion coil spring 38 acting on the clamp leg 4, and the notch 7a of the clamp leg is reliably clamped by the wedge action of the wedge surface 11a. 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. 7) in the past, whereas it has a triangular shape in the present embodiment, and it is difficult to slip, so that it is very useful when it rains. It is convenient. Further clamp clamp 12A
Is vertically asymmetrical, so whether or not the claw 11 closes the clamp leg insertion hole 6a, that is, whether the clamp leg 7 of a surveying instrument or the like can be inserted into the clamp leg insertion hole 6a, or the clamp leg insertion When the clamp leg 7 is inserted into the 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 a circular rolling element, and the material may be plastic, hard rubber or metal. When the piece 16 is a rolling element, the friction between the piece 16 and the arms 32 and 34 is significantly reduced, so that the clamp operation of the clamp leg 7 becomes smoother.

[Effect of device]

As is apparent from the above description, in the clamp device such as the surveying instrument in the leveling table according to the present invention, the movable clamp arm mechanism, which is the power transmission mechanism for transmitting the rotational force of the rotation operation lever to the clamp plate side, is movable. The arm is swingably supported by the clamp plate, and a torsion coil spring is interposed between the clamp plate and the movable arm.
Since the movable arm is biased to the fixed arm side, the movable arm is pivotally biased by the torsion coil spring with the support portion as a fulcrum, the clamping force of the piece is kept constant, and the rotation operation lever side Rotational force can be efficiently transmitted to the clamp plate side, which enables smooth clamping operation of the clamp legs.

In addition, the torsion coil spring has a load uniformly acting on the entire spring, does not become worn during long-term use, and has excellent durability.

[Brief description of drawings]

FIG. 1 is a perspective view of a leveling table showing an embodiment of the present invention, and FIG.
The figure is a perspective view of a main part of the clamp arm mechanism, FIGS. 3 and 4 are bottom views of the leveling table, operation explanatory views of the clamp arm mechanism, and FIGS. 5 and 6 are operation explanatory views of the clamp device. FIG. 7 is a front view in which the surveying instrument main body is placed on a conventional leveling table, and FIGS. 8 (a) and 8 (b) are explanatory views of the operation of a conventional clamp device (line VIII-VIII shown in FIG. 7). 9 (a) and 9 (b) are enlarged cross-sectional views of a main part of the conventional clamp arm mechanism, and FIG. 10 is an operation explanatory view of the conventional clamp arm mechanism. 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 ... crankshaft which is a rotary operation lever, 16 ... piece, 30 ... clamp arm mechanism which is a power transmission mechanism, 32 ... fixed arm, 34 ... movable arm, 38 ... torsion coil spring.

Claims (1)

[Scope of utility model registration request] 1. A hole for inserting a clamp leg of a surveying instrument or the like formed on the upper plate of the leveling table, and a clamp rotatably assembled on the lower surface of the upper plate and inserted through the clamp leg insertion hole. A clamp plate having a claw engageable with the cutout portion of the leg, a rotary operation lever provided on the upper plate and having a tip pivotally attached to a tip, a fixed arm supported by the clamp plate, and a fixed arm. A clamp, which is a power transmission mechanism that is spring-biased to the arm side and that comprises a movable arm that cooperates with the fixed arm to clamp the piece in the horizontal direction and that transmits the rotational force of the rotation operation lever side to the clamp plate side. A clamp device such as a surveying instrument on a leveling table including an arm mechanism, wherein the movable arm is swingably supported by the clamp plate, and the clamp plate and the movable arm are provided. A clamp device for a surveying instrument or the like in a leveling table, which is biased toward a fixed arm by a torsion coil spring interposed between frames.