JP3464046B2 - Telescopic surveying feet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extendable surveying leg, and more particularly to a surveying leg capable of easily fixing an outer cylinder and an inner cylinder.

[0002]

2. Description of the Related Art Conventionally, with a retractable pole or tripod, for example, a camera tripod, a screw type fixing grip is formed when the tripod is fixed, and the fixing grip is rotated to expand or contract. The legs are fixed. In the case of a clothesline or a fishing rod, the rod itself is rotated so that the internal fixing boss is axially eccentric and is fixed by the axial eccentricity.

In addition to the above, many techniques have been proposed for fixing the telescopic tripod. For example, inside the head end side of the outer cylinder pestle, the upper side is made substantially horizontal, and the lower side is inclined. The groove is formed near the inner end of the inner cylindrical punch to be fixedly inserted and connected to the outer cylindrical punch, and the upper side of the groove and the mold are substantially horizontal and the lower side is inclined. A technique of a fastening mechanism in a telescopic pestle for survey in which a protrusion is integrally provided with protrusions, and serrated engaging portions are additionally provided on the inclined lower side of the groove hole and the inclined lower side of the protrusion (for example, actual opening). 49
No. 131961) is known.

Further, a turning plate having substantially the same diameter as the sliding plate is eccentrically rotatably attached to the inner space of the outer cylindrical body forming the stone protrusion at the lower end, and the outer expanding force is applied to the lower end of the turning plate. The rotation fixing part integrally formed with the leg piece having the structure is individually mounted on the lower end of the inner cylindrical body, is inserted, and can be expanded and contracted and can be fixed at an appropriate position by twisting and rotating operation of the inner cylindrical body. There is known a technique of the stretchable measuring ball (for example, Japanese Utility Model Laid-Open No. 55-172806).

Further, the head of the metal rod is provided with a rounded triangular or polygonal shape at the top, and the outside has a circular shape and the inside has the same shape as the above, and has a slightly large size and has elasticity. The technology of telescopic surveying pole in which an inner rod with a packing is inserted into a hollow cylinder (actually 62-106
No. 16) is known.

Further, the expansion / contraction measurement in which the inner tube is slidably inserted into the inner space of the outer tube to make it expandable and contractible, and the tube can be fixed at an appropriate position by twisting and rotating both tubes. In the pole, a rotation fixing portion composed of a cap portion and a semicircular sliding collar plate is fixedly provided at the lower end portion of the inner tubular body, and a vertical sliding plate is mounted on the bottom portion of the semicircular sliding collar plate to rotate the eccentric shaft. By the eccentric shaft, an eccentric shaft is supported, and a rotation-stop notch is formed at the farthest point from the center of the eccentric shaft of the vertical sliding plate, and an angle-shaped projection is formed in the vertical direction of the inner wall surface of the outer tubular body. Paul's technology (Japanese Utility Model Publication No. 62-44330) is known.

Furthermore, a slide portion inscribed on the inner peripheral surface of the large-diameter side pipe provided on the outer periphery of the inner end portion of the small-diameter side pipe, and a groove long in the circumferential direction provided in the slide portion,
An elastic ball inserted in the groove so that the outer peripheral surface is weakly inscribed on the inner peripheral surface of the large diameter side pipe and the bottom surface of the groove,
A curved cam surface that makes the gap between the bottom surface of the same location provided on the bottom surface of both ends of the groove and the inner peripheral surface of the large diameter side pipe smaller than the diameter of the elastic ball, and the bottom surface and cam surface at the center of the groove A telescopic pole (actual opening flat 1
No. 67518) is known.

Further, a display portion is provided on the outer peripheral surface of the outer cylindrical body having a prism attached to the head portion, and a scale portion obtained by adding the height dimension of the outer cylindrical body to the outer peripheral surface is provided inside the outer cylindrical body. An inner cylindrical body having a stone projection formed at the lower end is rotatably and slidably fitted and supported, and a disc body is fixed to the upper end of the inner cylindrical body. An eccentric shaft supporting a rotary disk having a tooth-shaped engaging surface, and a plurality of leg pieces expanded upward on the upper surface of the rotary disk when the rotary disk is eccentrically rotated, its front end portion is of an outer cylindrical body. By arranging a plurality of vertical structural parts on the inner peripheral surface of the outer cylindrical body so as to project in pressure contact with the inner peripheral surface, the scale of the inner cylindrical body at the lower end edge of the outer cylindrical body at any position By reading the section, the high position of the prism can be grasped instantly, and by rotating the outer cylinder and the inner cylinder in different directions, the upper end of the inner cylinder A disk body fixed to the disk body, a rotating disk eccentrically supported on the upper surface of the disk body, and a plurality of leg pieces protruding from the upper surface of the rotating disk, and formed on the peripheral portion of the rotating disk. The tooth-shaped engaging surface and the tip of the leg piece are pressed against the inner peripheral surface of the outer cylindrical body,
A technique (Japanese Patent Publication No. 62-17681) of a target pole for an optical distance meter that can firmly fix an outer cylinder and an inner cylinder is known.

Further, in a measuring telescopic pole in which the inner tubular body is telescopically inserted into the outer tubular body, an operation ring member rotatably fitted near the outer peripheral end of the outer tubular body, A tightening ring member fitted between the outer cylinder and the operation ring member and screwed into a part of the inner circumference of the operation ring member via a taper screw portion; and an outer peripheral end of the outer cylinder. A through hole is provided in at least one place in the vicinity, and the tightening ring member is provided with a pressing portion which is located in the through hole and can come into contact with the outer circumference of the inner cylindrical body. There is also known a connecting and locking device for measuring telescopic poles (Japanese Utility Model Laid-Open No. 5-14824), which is configured to displace the pressing portion of the tightening ring member to the outer peripheral side of the inner cylindrical body in accordance with the screwing operation.

[0010]

In each of the above-mentioned prior arts, the shaft eccentricity is utilized, and there is a disadvantage that the inner cylinder and the outer cylinder are eccentric from the central axis due to the shaft eccentricity. In addition, the technique of fixing with a screw or the like from the outer cylinder side has a problem that the screw or the like is exposed to the outside, so there is a problem of interference with other devices or the worker's clothes are caught. It was

It is an object of the present invention to provide an extendable surveying leg which not only does not expose a fixing screw or the like to the outside but also which can fix the outer cylinder and the inner cylinder without eccentricity.

[0012]

The extendable surveying leg according to claim 1 is an extendable surveying leg comprising an inner cylinder and an outer cylinder capable of accommodating the inner cylinder. At the tip of the inner cylinder located inside the outer cylinder, there is a boss portion having a pressure contact portion having an elliptical horizontal cross section, and an interposition member attached to at least two expandable leg pieces. A stopper is provided, the stopper is rotatable with respect to the central axis of the boss portion, and the thickness of the opening leg piece and the interposition member is the major axis side of the pressure contact portion having the elliptical horizontal cross section. It is characterized in that it is formed to be larger than the distance between the inner surface of the outer cylindrical body and the inner surface of the outer cylindrical body.

The extendable surveying leg according to claim 2 is a retractable surveying leg comprising an inner cylinder and an outer cylinder capable of accommodating the inner cylinder, and is located inside the outer cylinder. At the tip of the inner cylindrical body, a boss portion having a pressure contact portion having an elliptical horizontal cross section, and an interposing member symmetrically attached to a spreadable opening leg piece symmetrically extending from the center of the boss portion. And a stopper that is rotatable with respect to the central axis of the boss portion, and the thickness of the opening leg piece and the interposing member is equal to that of the pressure contact portion having the elliptical horizontal cross section. It is formed larger than the distance between the long diameter side and the inner surface of the outer cylinder,
By rotating the inner cylindrical body, the pressure contact portion having an elliptical horizontal cross section rotates at the center of the axis of the inner cylindrical body, and the open leg is opened along the outer peripheral surface of the pressure contact portion having the elliptical horizontal cross section. The interposition member is pressed against the press contact portion of the boss portion and the inner peripheral surface of the outer tubular body so that the inner tubular body and the outer tubular body are fixed.

[0014]

[Operation] At the tip of the inner cylinder located inside the outer cylinder,
A boss portion having a pressure contact portion having an elliptical horizontal cross section and a stopper made of an interposition member attached to at least two expandable leg pieces are arranged, and the stopper is the center of the boss portion. Since the opening leg piece and the interposition member are made rotatable with respect to the shaft, the thickness of the opening leg piece and the interposition member is formed to be larger than the distance between the major diameter side of the pressure contact portion having the elliptical horizontal cross section and the inner surface of the outer cylindrical body. , When the inner cylinder is rotated relative to the outer cylinder, the press contact part of the horizontal cross-section elliptical shape at the tip of the inner cylinder rotates, and the open leg piece has a horizontal cross-section ellipse centered on the central axis of the inner cylinder. With the shape of the pressure contact part, the open leg can be rotated while opening the leg. As a result, the intervening member provided on the open leg piece is
It is interposed between the press contact portion and the outer peripheral surface of the outer cylinder, and is pressed against the outer contact of the outer peripheral cylinder, so that the inner cylinder and the outer cylinder are not eccentric with respect to the central axis, and the inner cylinder and the outer cylinder are not eccentric. The cylinder is fixed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.

FIGS. 1 to 3 show a first embodiment according to the present invention. FIG. 1 is a perspective view of a tripod using an extendable surveying leg, and FIG. 2 is a sectional view taken along line AA of FIG. 3 and 4 are enlarged cross-sectional views of the main part of FIG.

The extendable surveying leg S in this example is mainly composed of an outer cylindrical body 10, an inner cylindrical body 20, a boss portion 30, and a stopper portion 40, and the stopper portion 40 is an open leg. It is composed of a piece 41 and an interposition member 42.

The outer cylindrical body 10 of this embodiment is composed of a hollow cylindrical tubular body, and a connecting portion (not shown) for connecting to a leg is formed at one end portion and the other end portion. The outer peripheral surface of the engaging hole 12 that engages with the retaining member 13 of the inner tubular body 20.
Are perforated opposite to each other.

In the retaining member 13 of this embodiment, as shown in FIG. 3, the inner cover 13a and the outer cover 13b form a groove portion 13c having the thickness of the outer cylindrical body 10 at one end and are integrally connected. Has been done. The inner cover 13a is formed with two notches 13d at two positions.
a is formed so as to be flexible in the center direction of the diameter. Further, an engagement protrusion 13e that fits into the engagement hole 12 of the outer cylindrical body 10 is formed on the outer peripheral surface of the inner cover 13a at a position different from the cut portion 13d by 90 degrees.

The inner cylinder 20 of the present example is formed of a hollow cylinder, and a stone projection 21 is arranged at one end which is always exposed from the outer cylinder 10. Further, a connection hole 22 for mounting a connection pin 23 is formed facing each other on the end portion side which is normally located inside the outer cylindrical body 10. The connection hole 22 and the connection pin 23 form a boss portion 30. The inner cylindrical body 20 is integrally attached.

The boss portion 30 of this example is made of a composite material obtained by mixing glass fiber with polycarbonate.
As shown in FIG. 5, a fitting portion 31 that is fitted into the inner tubular body 20, an engaging portion 32 that engages with an end surface of the inner tubular body 20 to regulate a fitting range of the fitting portion 31, and an external portion. The pressure contact portion 33 having an elliptical horizontal cross-section exposed to the inside, and the center position of the pressure contact portion 33, that is, the center of the boss portion 30 and the inner cylindrical body 20.
And a screw hole 35 formed on the central axis of the.

As shown in FIG. 3, the fitting portion 31 of the boss portion 30 has a connecting hole 22 formed in the inner cylindrical body 20.
A connecting hole 31a is formed so as to match with, and the engaging portion 32 is formed to be slightly larger than the outer circumference of the inner tubular body 20. As shown in FIGS. 4 and 5, the press contact portion 33 having an elliptical horizontal cross section is formed such that the long diameter side is larger than the fitting portion 31 and the short diameter side is smaller than the fitting portion 31.

As shown in FIGS. 2 and 3, the stopper portion 40 of this embodiment has two openable leg pieces 41 and an intervening member 42 arranged at the end of the openable leg pieces 41. It consists of and.

The open leg piece 41 of this example is composed of a thin leaf spring made of stainless steel for springs, and the central engaging surface 4 is arranged on the end face of the pressure contact portion 33 having an elliptical horizontal cross section.
1a and a bent portion 41b that extends symmetrically from the central engagement surface 41a to both sides and is bent downward (that is, the pressure contact portion 33 side). An interposition member 42 is attached to the tip of the bent portion 41b, which is a free end portion on both sides of the open leg piece 41.

The intervening member 42 of this example is made of a so-called engineering plastic such as a composite material composed of polycarbonate and glass fiber or nylon resistant to low temperature. It is formed to be larger than the distance between the major axis side of the portion 33 and the inner surface of the outer cylindrical body 10. And the boss part 3 is always
Screws, screws, etc. (hereinafter simply “screw”) with respect to the center axis of 0
(51) and is arranged so as to be freely rotatable with respect to the press contact portion 33 at the central engaging surface 41a.

In this example, the interposition members 42 are arranged on both sides of the tip of the bent portion 41b of the open leg piece 41, but only on the outside of the open leg piece 41 (that is, on the side that contacts the inner side of the outer cylindrical body 10). It can also be installed in. In this case, the thickness of the open leg piece 41 and the interposition member 42 is formed to be larger than the distance between the major diameter side of the pressure contact portion 33 having an elliptical horizontal cross section and the inner surface of the outer cylindrical body 10.

The boss portion 30 is assembled as follows. That is, the fitting portion 31 is fitted into the inner tubular body 20, but is fitted into the inner tubular body 20 and the connecting hole 22 of the inner tubular body 20 is fitted.
And the connection hole 31a are aligned with each other, and the connection pin 23 is mounted in the connection hole 22 and the connection hole 31a to be connected. A rubber cover 34 is provided to prevent the connecting pin 23 from coming off.
To coat. As a result, the boss portion 30 becomes the inner cylindrical body 2
It is fixed together with 0.

Next, the inner cylindrical body 2 having the boss portion 30 attached thereto
0 is inserted into the outer cylindrical body 10. The insertion is performed with the open leg piece 41 and the interposition member 42 positioned on the short diameter side of the press contact portion 33. As a result, the inner cylinder 20 is arranged inside the outer cylinder 10.

Next, the fixing of the extendable surveying leg S having the above structure will be described. When the open leg piece 41 is located in the pressure contact portion 33 on the short diameter side, the inner cylindrical body 20 and the outer cylindrical body are arranged. 10 is not regulated, the inner cylinder 20 and the outer cylinder 1
0 slides freely. Therefore, the surveying leg S can be expanded and contracted. When fixing, the inner cylinder 20 and the outer cylinder 10 are relatively rotated at a desired position. The rotation may be either left or right.

When the inner cylinder 20 is rotated relative to the outer cylinder 10 in this manner, the boss portion 30 (that is, the pressure contact portion 33) having an elliptical horizontal cross section at the tip portion of the inner cylinder 20 is rotated and opened. The leg piece 41 is centered on the central axis of the inner tubular body 20,
The pressure contact portion 33 causes the opening leg piece 41 to rotate while opening the leg. At this time, since the thickness of the interposition member 42 is formed to be larger than the distance between the major diameter side of the pressure contact portion 33 having the elliptical horizontal cross section and the inner surface of the outer cylindrical body 10, the open leg piece 41.
The intervening member 42 provided on the pressure contact portion 33 of the boss portion 30
Is interposed between the outer cylindrical body 10 and the outer cylindrical body 10 and is pressed against the outer cylindrical body 10 by the pressure contact portion 33 and the outer cylindrical body 10.
The inner cylinder 20 and the outer cylinder 10 are fixed to each other without being eccentric with respect to the central axis.

FIGS. 6 and 7 show the second embodiment.
6 is a sectional view taken along line BB of FIG. 7, and FIG. 7 is an enlarged sectional view of a main part of the surveying leg S. In this example, the same members as in the above example,
The same symbols are given to the arrangement and the like, and the description thereof is omitted.

In the embodiment described above, the pressure contact portion 33 of the boss portion 30 has an elliptical horizontal cross section and two open leg pieces 41 are shown. In this embodiment, the shape of the pressure contact portion 63 of the boss portion 30 is shown. 3 pressure contact parts 63a, 63b, 63c every 120 degrees
As the pressure contact portions 63a, 63b, 63c are formed to have substantially the same length as the major axis of the horizontal section elliptical shape of the above-mentioned embodiment,
In addition, the open leg piece 61 that constitutes the stopper portion 40 is also shown as an example in which it is formed as bent portions 61a, 61b, and 61c every 120 degrees. Reference numeral 62a in FIG. 7 is a bent portion similar to the reference numeral 41b in the above embodiment.

The pressure contact portion 63 of the boss portion 30 as in this embodiment
When it is formed so that there are three places (63a, 63b, 63c), not only the fixing force when fixed is increased, but also
Since the pressure contact portion 63 is formed every 120 degrees, when fixing the inner tubular body 20 and the outer tubular body 10, the inner tubular body 2 is fixed.
The rotation stroke of 0 can be reduced.

FIGS. 8 and 9 show the third embodiment.
8 is a sectional view taken along the line CC of FIG. 9, and FIG. 9 is an enlarged sectional view of a main part of the surveying leg S. In this example, the same members as in the above example,
The same symbols are given to the arrangement and the like, and the description thereof is omitted.

In each of the above-described embodiments, an example in which the bent portion constituting the open leg piece is bent toward the inner cylindrical body side is shown, but in the present embodiment, it is directed in the opposite direction to the inner cylindrical body. It shows an example of the configuration.

That is, in this example, the boss portion is divided into two,
The fitting portion 31 and the press contact portion 71 are formed. As shown in FIG. 9, the press contact portion 71 of this example has an elliptical horizontal cross section in which the upper outer peripheral surface 71a has a short diameter and a long diameter. The structure of the press contact portion 71 is basically the same as that of the above embodiment. Further, the lower portion 71b is formed smaller than the central engaging surface 41a of the opening leg piece 41. An arrangement hole 72 for the screw 51 is formed in the central portion, and a screw hole 73 is formed continuously with the arrangement hole 72 for the screw 51.

The stopper portion 40 is assembled by assembling the press-contact portion 71 with the fitting portion 31 and the screw 51 on the upper portion of the engaging portion 32 constituting the boss portion 30 via the central engaging surface 41a of the opening leg piece 41. Fixed to. At this time, the open leg piece 41 is arranged to be freely rotatable. The operation of the press contact portion 71 of this example is the same as that of the above-mentioned embodiment.

As in this example, the bent portion 41b is provided with the inner cylindrical body 20.
If it is configured in the opposite direction (that is, upward in FIG. 9), the inner cylindrical body 20 can be smoothly slid. In the above-described embodiment, the pressure contact portion is formed to have an elliptical horizontal cross section, and the number of the open leg pieces is two. However, this is similar to FIG. 6 and FIG.
The shape of the press contact portion of the boss portion 30 should be three press contact portions every 120 degrees, and should be formed to have almost the same length as the major axis of the horizontal cross section elliptical shape, and the open leg pieces should also be formed as bent portions every 120 degrees. You can

[0039]

As described above, according to the present invention, not only the fixing screw and the like are not exposed to the outside, but the inner cylinder and the outer cylinder are not eccentric to the central axis, It is possible to provide a telescopic surveying leg that can fix the outer cylinder.

[Brief description of drawings]

FIG. 1 is a perspective view of a tripod using a stretchable surveying leg according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged cross-sectional view of a main part of FIG.

FIG. 4 is a front view of a boss portion.

FIG. 5 is a side view of a boss portion.

FIG. 6 is a sectional view taken along line BB of FIG. 7 showing a second embodiment.

FIG. 7 is an enlarged sectional view of a main part of a surveying leg.

8 is a sectional view taken along line CC of FIG. 9 showing a third embodiment.

FIG. 9 is an enlarged sectional view of a main part of a surveying leg.

[Explanation of symbols]

10 Outer cylinder 11 Connection 12 connection holes 13 retaining member 13a inner cover 13b outer cover 13c groove 13d notch 20 Inner cylinder 21 stone foot 22 Connection hole 23 pin 30 Boss 31 Fitting part 31a Connection hole 32 Engagement part 33 Pressure contact part 34 screw holes 40 Stopper 41 open leg 41a central engaging surface 42 Intervening member 41b Bent section 61 open leg 61a, 61b, 61c Bent part 63 Pressure contact part 63a, 63b, 63c Pressure contact part 71 Pressure contact part 71a Upper peripheral surface 71b lower part 72 Placement hole 73 screw holes S Telescopic surveying leg

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01C 15/00 F16M 11/24-11/32

Claims (2)

(57) [Claims] 1. A stretchable surveying leg comprising an inner cylinder and an outer cylinder capable of accommodating the inner cylinder, wherein a horizontal cross section is provided at a tip portion of the inner cylinder located inside the outer cylinder. A boss portion having an oval-shaped pressure contact portion and a stopper made of an interposition member attached to at least two expandable leg pieces are arranged, and the stopper is provided on the central axis of the boss portion. The opening leg piece and the intervening member are formed to be rotatable with respect to each other, and are formed to have a thickness larger than a distance between the major diameter side of the pressure contact portion having the elliptical horizontal cross section and the inner surface of the outer cylindrical body. An extendable surveying leg. 2. A stretchable surveying leg comprising an inner cylinder and an outer cylinder capable of accommodating the inner cylinder, wherein a horizontal cross section is provided at a tip portion of the inner cylinder located inside the outer cylinder. A boss portion having an elliptical pressure contact portion and a stopper made of an interposition member symmetrically attached to an expandable open leg piece extending symmetrically from the center of the boss portion are arranged. Is rotatable relative to the central axis of the boss portion, and the thickness of the opening leg piece and the interposition member is greater than the distance between the major diameter side of the pressure contact portion having the elliptical horizontal cross section and the inner surface of the outer cylindrical body. By being formed large, by rotating the inner cylinder, the pressure contact portion having an elliptical horizontal cross section rotates at the center of the axis of the inner cylinder, and along the outer peripheral surface of the pressure contact portion having the elliptical horizontal cross section. The leg opening piece is opened, and the interposition member is formed between the pressure contact portion of the boss portion and the inner peripheral surface of the outer cylindrical body. An extendable surveying leg characterized in that the inner cylinder and the outer cylinder are fixed by pressure contact.