JPH0511017U - Survey tripod - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a surveying tripod capable of mounting a surveying instrument on a pedestal with good operability. [Structure] In the surveying tripod according to the present invention, the pedestal 3 is attached to the upper end of the moving rod 8 of the lifting device 4 vertically attached to the pedestal 2 at the upper end of the tripod, and the surveying equipment is installed on the pedestal 3. A rod 28 having a mounting screw 30 rotatably provided, a first bevel gear 31 fixed to the lower surface of the base of the mounting screw 30, and a second bevel gear 29 meshing with the first bevel gear 31 fixed thereto. Is rotatably inserted laterally from the upper end of the movable rod shaft 8, and an operating knob 27 for rotation is attached to the outer operating end of the rod 28.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a surveying tripod used to install a surveying instrument such as a level or a transit used for surveying, and more particularly to a surveying tripod with improved operability when the surveying instrument is mounted on a tripod pedestal.

[0002]

[Prior Art]

 A surveying instrument such as a transit, which is used for leveling and for precisely measuring the level and angle, is used by installing it on the base of a tripod for surveying. An example of this surveying tripod is disclosed in Japanese Utility Model Laid-Open No. 61-170799, and FIG. 7 shows a partially cutaway front view of the tripod. In this figure, an elevating rod 53 having a rack 52 formed in the vertical direction is vertically inserted in a leg base 51 connecting the upper ends of three leg members 50, and an operating handle provided with a gear meshing with the rack 52. 54 is attached to the pedestal 51. Further, a pedestal 55 on which a surveying instrument is detachably installed is attached to the upper end (leg) of the elevating rod 53. In this surveying tripod, the raising and lowering rod 53 can be raised and lowered by rotating the operating handle 54 by the engagement of the gear and the rack 52, and the position of the pedestal 55 can be moved in a wide range in the vertical direction. At the center of the pedestal 55, a mounting screw 56 is provided so as to project the surveying instrument on the pedestal 55 in a detachable manner. This mounting screw 56 can be rotated by turning the operation knob 57 on the lower surface of the pedestal that is connected by a gear, and by screwing this mounting screw 56 into the female thread for installation provided on the lower surface of the surveying instrument. The surveying instrument can be fixed on the pedestal 55.

Further, the surveying tripod previously proposed by the applicant of the present application in Japanese Patent Application No. 1-141620 has a mounting screw at the center of a pedestal 61 which is vertically moved by an elevating device 60 as shown in FIG. 62 is integrally projected. When installing the surveying instrument on this pedestal 61, while rotating the pedestal 61, the mounting screw 62 is screwed into the female thread portion on the surveying instrument side, and then the tightening screw 63 is turned to fix the surveying instrument to the pedestal. ..

[0004]

[Problems to be solved by the device]

 In the former tripod for surveying, since the operation knob 57 is provided on the lower surface side of the pedestal 55, there is a problem that the operability when installing the surveying instrument on the pedestal 55 is poor. Also, in the latter survey tripod, since the pedestal 61 and the mounting screw 62 are integrated, it is necessary to install the surveying instrument while rotating the pedestal 61. At this time, hold the surveying instrument so that it does not touch the pedestal surface. However, there is a problem in that the installation of the surveying instrument becomes complicated.

The present invention has been proposed in order to solve the problems of the conventional technology, and an object thereof is to provide a surveying tripod capable of installing a surveying instrument on a pedestal with good operability. To do.

[0006]

[Means for Solving the Problems]

 In order to achieve this object, the present invention is such that a lifting device is vertically mounted on a foot stand connecting the upper ends of three legs, and a mounting screw for detachably installing a surveying instrument is projected. The installed pedestal is attached to the upper end of the lifting rod of the lifting device, and the lifting device is driven by a rotating means to raise and lower the lifting rod via a screw mechanism. The above-mentioned mounting screw is rotatably provided on the top of the rod, and the first bevel gear is fixed to the lower surface of the base of the mounting screw, and the second bevel gear that meshes with the first bevel gear is fixed to the rod. The lifting rod is horizontally attached to the upper end of the rod for rotation, and an operating knob for rotation is attached to the outer operating end of the rod.

[0007]

[Action]

 According to the configuration described above, the mounting screw on the pedestal can be rotated via the bevel gears that mesh with each other by turning the operation knob, and the female screw portion on the lower surface side of the surveying instrument placed on the pedestal can be The surveying instrument can be installed on the pedestal by screwing the mounting screws.

[0008]

【Example】

 BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on the illustrated embodiment. First, FIG. 1 is an overall view showing an embodiment of a surveying tripod according to the present invention. In this figure, a leg base 2 for connecting the leg members 1 so that they can be freely opened is attached to the upper ends of the three leg members 1 which can be expanded and contracted. An elevating device 4 for vertically elevating the surveying instrument to be installed is vertically installed. As shown in FIG. 2, the lifting device 4 is a lifting operation handle 5 attached to the lower end of the device, a gear mechanism portion 6 connected to the operation handle 5, and a gear mechanism portion 6 that meshes with and rotates. Main shaft lead screw 7, moving pipe shaft 8 arranged on the outer periphery of lead screw 7 and moving up and down as lead screw 7 rotates, and outer pipe 9 that covers the outer periphery of moving pipe shaft 8 and guides up and down movement. The pedestal 3 is attached to the upper end of the moving tube shaft 8.

A base portion of the operation handle 5 is connected to a gear shaft 11 of a pinion gear 10 forming a part of the gear mechanism portion 6 via a handle adapter 12. The gear mechanism portion 6 is housed in a bottom-closed gear case 13 fixed to the lower end portion of the outer pipe 9 with a screw, and the pinion gear 10 has a gear shaft 11 protruding outward in the horizontal direction and a holder 14 and a gear shaft 11. By being held by the collar 15 fitted inside the holder 14, it is rotatably attached to the inner peripheral side of the gear case 13. The pinion gear 10 is meshed with a ring-shaped crown gear 17 which is screwed to the outer periphery of the lower end of the spindle lead screw 7 and whose lower surface is received by the molding 16. In this embodiment, the gear ratio between the pinion gear 10 and the crown gear 17 is set to 22: 120, and the spindle lead screw 7 described later can be rotated with a small force. FIG. 3 shows a cross-sectional view of the gear mechanism section 6. The spindle lead screw 7, which is a screw rod, is rotatably supported by a bearing 19 attached to a bearing receiving fitting 18 arranged above the crown gear 17, and by turning the operating handle 5, The lead screw 7 is rotated by the meshing of the pinion gear 10 and the crown gear 17. Reference numeral 20 is a bearing receiving ring. A male screw portion 25 is formed in the longitudinal direction on the outer peripheral portion of the spindle lead screw 7.

As shown in FIG. 4, the upper end portion side of the outer pipe 9 is an outer pipe portion 9A which is separable from the lower side, and the outer pipe portion 9A is the center of the base 2 having a substantially triangular plan shape. It is inserted into an attachment hole 21 formed in the portion (see FIG. 5) and is screwed to the inner peripheral portion of a fixed platen 22 screwed onto the leg base 2. Since the outer pipe 9 can be separated into the lower part and the outer part 9A on the upper end side in this way, the outer part 9A on the upper end side, which requires particularly high mechanical working accuracy, can be manufactured accurately. There is an advantage that you can. A member that is screwed onto the male screw portion 23 of the outer pipe portion 9A on the lower surface side of the leg base 2 is a double nut 24 for fastening and fixing the outer pipe. The inner peripheral portion of the upper surface of the double nut 24 projects in a taper shape toward the pedestal 2 side, and when the double nut 24 is tightened, the pedestal 2 can be firmly held by the tapered portion 24a. ..

At the lower end portion of the moving tube shaft 8 which is arranged between the outer tube 9 and the main shaft lead screw 7 so as to be movable in the vertical direction, a ring-shaped member that is screwed into the male screw portion 25 on the outer peripheral portion of the lead screw. The feed screw 26 is screwed. As shown in FIG. 6, the moving pipe shaft 8 which is an elevating rod has a protrusion 8A projecting from the lower end portion of the moving pipe shaft 8 in the lateral direction, and a groove portion formed in the vertical direction on the inner peripheral wall of the outer pipe 9. By being fitted to 9a, the vertical movement is guided. As a result, the feed screw 26 is screwed up and down in accordance with the direction of rotation of the spindle lead screw 7, and the movable tube shaft 8 is guided by the outer tube 9 and moved up and down.

A rotary rod 28 having an operation knob 27 fixed to the outside is rotatably inserted in the lateral direction from the upper end of the moving tube shaft 8, and the end of the rod 28 in the moving tube shaft 8 is inserted into the moving rod shaft 8. The bevel gear 29 is fixed. At the center of the upper surface of the pedestal 3 which is screwed to the top of the moving tube shaft 8, the female screw portion of the connecting portion of the surveying instrument is screwed to attach the surveying instrument to the pedestal 3 in a detachable manner. A mounting screw 30 is rotatably projected. A bevel gear 31 is screwed on the lower surface side of the pedestal of the mounting screw 30, and the bevel gear 31 meshes with the bevel gear 29 on the operation knob side. In this configuration, the mounting screw 30 on the pedestal 3 can be rotated by rotating the operation knob 27. When the surveying instrument is not attached, a protective cap 32 is screwed onto the attaching screw 30. Mounted on the pedestal surface is a spirit level 33.

In the surveying tripod having the above structure, the operation handle 5 can be rotated to adjust the position of the pedestal 3 in the upward and downward directions with a wide range of strokes. To install the surveying instrument on the pedestal 3, rotate the operating knob 27 projecting laterally from the upper end of the moving tube shaft 8 and screw the mounting screw 30 into the female thread on the lower surface side of the surveying instrument. The surveying instrument can be fixed on the pedestal 3 with good operability. Unlike the bellows used in the conventional one, the outer tube 9 is hard and therefore is not damaged, and dust and the like do not adhere to the internal mechanical section, so that it can be used for a long period of time. It has the advantages that it can ensure a smooth lifting operation and that it has a beautiful appearance. Incidentally, a seal tension 34 is provided on the lower portion of the outer peripheral portion of the outer tube 9 which also functions as a decorative tube for gripping during operation.

In the above-described embodiment, the pinion gear 10 is configured to be rotated by the operation handle 5. However, the pinion gear 5 may be configured to be rotated by a rotating means using a motor. The present invention can also be applied to a conventional surveying tripod that raises and lowers a pedestal by a combination of a screw shaft and an operation handle as shown in FIG.

[0015]

[Effect of the device]

 As is apparent from the above-described embodiment, in the present invention, the mounting screw is provided on the pedestal so as to be rotatable, and the mounting screw can be rotated by the laterally protruding operation knob via the bevel gear mechanism. The surveying instrument can be mounted on the pedestal with better operability than when the operation knob is installed on the lower surface side of the pedestal or the mounting screw is rotated together with the pedestal as in the past. In addition, when mounting the surveying instrument, simply turn the operation knob while the surveying instrument is placed on the pedestal, and there is no need to hold the surveying instrument so that it does not come into contact with the pedestal as in the past. Easy to set up.

[Brief description of drawings]

FIG. 1 is a front view showing a surveying tripod according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the lifting device for the surveying tripod.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a plan view of the surveying tripod.

FIG. 6 is a sectional view taken along line CC of FIG.

FIG. 7 is a front view showing a conventional tripod for surveying.

FIG. 8 is a front view showing another conventional tripod for surveying.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Leg material 2 Leg base 3 Pedestal 4 Lifting device 5 Operation handle 6 Gear mechanism section 7 Main shaft lead screw 8 Moving tube axis 8A Projecting piece 9 Outer tube 9a Groove section 10 Pinion gear 11 Gear axis 12 Handle adapter 13 Crown gear 14 Holder 15 Color 16 molding 17 crown gear 18 bearing receiving fitting 19 bearing 20 bearing receiving ring 21 mounting hole 22 fixing plate 23 male screw part 24 double nut 25 screw part 26 feed screw screw 27 operation knob 28 rotating rod 29 bevel gear 31 bevel gear 32 cap 33 Level 34 Sealed

Claims (1)

[Claims for utility model registration] [Claim 1] An elevating device is vertically attached to a foot stand that connects the upper ends of three legs, and a mounting screw for detachably installing a surveying instrument is attached. The projecting pedestal is attached to the upper end of the elevating rod of the elevating device, and the elevating device is moved up and down by a rotating means to raise and lower the elevating rod via a screw mechanism. A rod having the above-mentioned mounting screw rotatably mounted thereon, the first bevel gear fixedly attached to the lower surface of the pedestal of the mounting screw, and the second bevel gear meshing with the first bevel gear fixed thereto is attached to the lifting rod. A tripod for surveying, which is rotatably inserted laterally from the upper end and has an operation knob for rotation attached to the outer operation end of this rod.