JPH07239231A - Stopper pin for staff - Google Patents

Abstract

PURPOSE:To provide a stopper pin for staff improved not to loose function and fail even in the case an impact force works on it. CONSTITUTION:Constituted are of a cylinder part 6 fixed in a reception hole 5 provided in the small diameter side 2b of a staff consisting of a plurality of square cylinder combined free of extension in telescopic type, and a plunger part 7 of which tip can be inserted in a stopper hole 3 which slides in the cylinder part 6 and is provided in the large diameter side 2a with a spring force to the projectile direction. The reception hole 5 is penetrated from the front surface to the back surface of the square cylinder. The bottom side of the cylinder part 7 is fixed on the front surface of the square cylinder and the top side is fixed on the back surface of the square cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper pin for holding a stretched state of a surveying box scale, which is formed by combining a plurality of rectangular cylinders so as to be telescopically expandable.

[0002]

2. Description of the Related Art A box scale which is telescopically expandable and contractable by combining a plurality of square tubes having different diameters is used for surveying. In general, this type of box measure is provided with a stopper pin for holding a fixed length mode during extension (see Japanese Utility Model Publication No. 2-49540).

As shown in FIG. 3, the stopper pin 4 has a cylinder member 6 fixed in a receiving hole 5 provided in a small-diameter side rectangular tube 2b constituting the box measure 1, and the cylinder member 6. And a plunger member 7 which is elastically urged in a protruding direction by a coil spring 8 so that its projecting end can project into a stopper hole 3 provided in the square cylinder 2a on the large diameter side.

Conventionally, the stopper pin 4 is formed by inserting a cylinder member 6 into the inside of the square tube 2b through a receiving hole 5 formed in the back surface of the square tube 2b on the small diameter side, and inserting the cylinder member 6 into the top end T thereof. The outer circumference and the inner circumference of the receiving hole 5 are fixed to each other by being fixed to the rectangular tube 2b. Therefore, the bottom end B of the cylinder member 6 is cantilevered, and may be in a state of floating in the space inside the rectangular tube 2b.

[0005]

Therefore, when the plunger member 7 rushes into the stopper hole 3 when the box measure 1 is extended, when a shocking force acts on the protruding end, the axis of the stopper pin 4 bends. In some cases, the function as a stopper pin is impaired due to this, and the plunger member 7 is not sufficiently retracted, so that the expansion and contraction operation of the box measure 1 cannot be performed smoothly. The stopper pin 4 itself may be damaged.

The present invention has been devised in order to eliminate such disadvantages of the prior art, and its main purpose is to:
An object of the present invention is to provide a stopper pin for a box scale that is improved so as not to lose its function or be damaged even when an impact force is applied.

[0007]

According to the present invention, such an object is to provide a receiving hole provided on the small diameter side of a box scale composed of a plurality of square tubes which are telescopically combined in a telescopic manner. And a plunger member that is slidably engaged with the cylinder member and elastically urged in the protruding direction so that its projecting end can project into a stopper hole provided on the large diameter side. Provided is a stopper pin for a box measure, characterized in that a hole penetrates from the front side to the back side of the square tube, the bottom side of the cylinder member is fixed to the front side of the square tube, and the top side is fixed to the back side of the square tube. To be achieved.

[0008]

According to this structure, since both ends of the cylinder member are fixed to the walls on both sides of the square tube forming the box measure, the holding force of the stopper pin shaft center is increased and the strength against impact force is increased. To do.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings.

FIG. 1 is a box scale 1 constructed according to the present invention.
Is shown. This box measure 1 is formed by nesting square tubes each having a predetermined length and different calibers and having different cross-sections, and the sequentially reduced square tubes are inserted into the lowest-ranked square tube having the largest diameter. Has been done. And a relatively large-diameter square tube 2a
A stopper hole 3 is provided in the center of the back surface near the upper end of the rectangular tube 2a having a relatively small diameter that is slid into the large-diameter rectangular tube 2a and extends when extended. Has been done.

As shown in FIG. 2, the stopper pin 4 is slidable in the cylinder member 6 and the cylinder member 6 fixed in the receiving hole 5 provided in the small diameter side square tube 2b of the box measure 1. And a compression coil spring 8 that is compressed between the bottom side inner surface of the cylinder member 6 and the top side inner surface of the plunger member 7. Bombing has been activated.

In order to prevent the plunger member 7 from falling off the cylinder member 6 by restricting the excessive movement of the plunger member 7 by the coil spring 8, the sliding contact surfaces of the cylinder member 6 and the plunger member 7 are arranged. Is provided with a retaining means. The retaining means includes a plurality of protrusions 9 provided on the outer peripheral surface of the plunger member 7, and the protrusions 9.
Is formed on the inner peripheral surface of the cylinder member 6 in order to receive the above.

At the bottom end of the cylinder member 6 and the top end of the plunger member 7, square cylinders 2a, 2 which are slidable with each other.
In order to reduce the sliding resistance with the inner surface of b, slipper members 11a and 11b made of a synthetic resin material are fixed.

In the box measure 1 constructed in this manner, when the rectangular cylinders are extended, the projecting end of the plunger member 7 projecting from the cylinder member 6 projects into the stopper hole 3 of the large-diameter side rectangular cylinder 2a, and Relative sliding between the cylinders is restricted. Then, by pushing the plunger member 7 against the elastic force of the coil spring 8 and removing it from the stopper hole 3, the square tubes can be slid and contracted.

Here, the receiving hole 5 provided in the small diameter side square tube 2b penetrates from the front side to the back side of the square tube 2b, and the top side T of the cylinder member 6 is the back side and the bottom side B is.
Is stuck on the front side. Thereby, the cylinder member 6
Since both ends of the cylinder are fixed to the walls on both sides of the square tube 2b, the holding force of the axial center of the cylinder member 6 increases, and when the plunger member 7 penetrates into the stopper hole 3 during the extension operation of the box measure 1, the protrusion end The strength against the impact acting on is increased.

[0016]

As described above, according to the present invention, a through hole is provided on the small diameter side of a box measure made up of a plurality of rectangular tubes that are telescopically combined so as to be able to expand and contract, and a stopper pin is provided in this through hole. Since the cylinder member was inserted, the bottom side of the cylinder member was fixed to the front side of the square tube, and the top side was fixed to the back side, an impact force was applied to the tip of the plunger when the box scale was extended. Also in this case, it is possible to prevent the stopper pin from being easily bent, impairing the function as the stopper pin, and preventing the expansion and contraction from being smoothly performed.

[Brief description of drawings]

FIG. 1 is a front view of a box measure to which a stopper pin according to the present invention is applied.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a cross-sectional view of a conventional stopper pin similar to FIG.

[Explanation of symbols]

 1 Box Measure 2a Large Diameter Square Tube 2b Small Diameter Square Tube 3 Stopper Hole 4 Stopper Pin 5 Receiving Hole 6 Cylinder Member 7 Plunger Member 8 Compression Coil Spring 9 Projection 10 Groove 11a ・ 11b Slipper Member

Claims (1)

[Claims] 1. A cylinder member fixed in a receiving hole provided on a small diameter side of a box scale made of a plurality of square tubes which are telescopically combined so as to be expandable and contractible, and slidably fitted on the cylinder member. A stopper pin for a box scale, which comprises a plunger member that is elastically urged in the protruding direction and can project the projecting end into a stopper hole provided on the large diameter side, wherein the receiving hole is a small diameter side square tube. Penetrate from the front side to the back side of
The bottom side of the cylinder member is fixed to the front side of the rectangular tube,
Box-size stopper pin whose top side is fixed to the back side of the rectangular tube.