FI75930C - RAOMAERKE FOER UTSTAKNING AV GRAENSPUNKTERNA AV ETT LANDOMRAODE. - Google Patents

Description

75930

Border laundry for marking land boundary points

The present invention relates to a border laundry according to the preamble of claim 1.

Such a boundary laundry is intended primarily for marking land boundaries, and preferably comprises a tubular arm made of metal, a tip portion attached to the end of the arm, penetrating the ground, and optionally a display piece attached to the other end of the arm.

Numerous structural solutions for landmark piles are already known, in which e.g. wood and plastic. However, these have significant drawbacks in terms of their durability. Thus, a pile of wood breaks easily when knocked to the ground and may practically rot after a few years. Markers made of plastic material are more resistant to the prevailing conditions, but break down easily during the installation phase if special solutions are not used to protect the arm (cf., for example, the solution presented in FI patent application 820024).

Border laundry is a milestone that requires exceptionally long durability (up to over 100 years). For this reason, the arms used in them are made of metal tubes. In order to prevent corrosion caused by water flowing into the pipe and ions from the ground, galvanized special steel grades have had to be used. However, these are remarkably expensive.

The object of the present invention is to provide a new type of landmark and in particular boundary laundry solution with a metal handle. The invention is based on the idea that an elongate notch extending through the wall of the stem is formed in the stem, extending substantially from end to end of the stem, whereby the water flowing into the pipe is dissipated therefrom.

2 75930 More specifically, the solution according to the invention is mainly characterized by what is set forth in the characterizing part of claim 1.

The notch on the arm of the marking pile according to the invention has a width of at least 0.1 mm, preferably 0.5 ... 1 mm.

It can be manufactured by machining a longitudinal notch of a pipe into a previously known steel-metal pipe. According to the invention, the arm preferably consists of a strip of metal plate which has been shaped, e.g. by pressing, into a chute in the shape of a letter C which is almost closed in cross-section. The trough is preferably galvanized after the treatment. The metal plate may be a steel grade suitable for itself, such as flat steel.

The invention provides considerable advantages. Thus, the shaft made of a relatively inexpensive material is very durable. Through the notch in the shaft, water can drain out, which reduces the corrosion stress on the inner surface of the shaft. The notch makes the galvanization of the metal pipe easier and can be performed more accurately.

The invention will now be examined in more detail with the aid of the accompanying drawing, which shows a preferred embodiment of the invention.

The boundary laundry consists of a display body 1 and a tubular arm 2 attached thereto, the open top end of which extends flush with the top surface of the display body. The boundary laundry according to the example has the principle of "triggering", i.e. it can be fixed to its base after being fitted to the ground by means of anchoring elements placed inside the arm. Said members, anchoring forks 6, are forced from the upper end of the arm against the spreading member 3 (anchor fork spreader) arranged at the lower end of the arm, whereby they protrude into the ground through cavities 4 formed at the lower end of the arm, adjacent to the spreading member 3, approximately as indicated by dashed lines.

3,75930

An elongate notch 5, less than a millimeter wide, extending substantially from end to end of the arm and extending through the wall of the arm is arranged in the arm 2 of the cowardly boundary laundry of the invention.

In the case of the example, 80x5 mm flat steel (grade according to STS 52 D) with a silicon content of 0.25% was used to make the boundary laundry. The flat steel plate was cut to the desired size, whereby the cavities 5 for the anchor ridges to be fitted inside the arm 2 were notched in the same work step. A 750 mm eccentric press was used to bend the pipes. The metal sheet was bent to its final shape in three steps: first it was bent into a U-shape with a low cross-section, then into a C-shape, after which the edges are bent against each other. There was then a clearance of about 0.5 ... 1 mm between the edges. The pipe was then galvanized in a manner known per se. Thanks to the clearance, the air removal and the actual galvanizing were successful. Inside the tube were then fitted loose anchoring tines 6 consisting of a 6x6 mm strip of flat steel pressed into a sharp V-shape. The anchoring tines were threaded into the tube at an acute angle upwards.

The display piece 1 was made of the above-mentioned flat steel, from which the cut pieces were machined with crimping tools, after which they were welded together on one side to form an open box. A notch was made in the upper cover of the display body, into which the upper end of the arm 2 was fitted through the open side of the body. The arm 2 and the display piece 1 were attached to each other by welding.

Within the framework of the invention, it is possible to think of solutions that deviate from the previous one. Thus, the shaft can be made of some other type of metal sheet that meets the durability requirements that can be set and that can be machined into the desired shape. The notched shank can alternatively be made of a finished metal tube into which the notch is machined.

4,75930

The invention is also suitable for use, for example, in the production of a boundary laundry to be fixed to a rock, which does not have a special display piece. The steel plate is then provided with the necessary markings, numbering, etc. already at the working stage, as the pipe could become flat when marked.

The arm structure according to the invention can also be used in a boundary laundry provided with a different type of anchoring member (e.g. a screw tip).

Claims (4)

5,75930 A boundary laundry, in particular for marking land boundaries, comprising - preferably a tubular arm (2) made of metal, - a tip part (3) attached to the end of the arm (2), and - optionally a display piece (1) attached to one end of the arm (2), characterized by in that the arm (2) is formed with an elongate notch (5) extending through the wall of the arm and extending substantially from end to end of the arm. Border laundry according to Claim 1, characterized in that the width of the notch (5) is 0.2 to 5 mm, preferably 0.5 to 1 mm. Border laundry according to Claim 1 or 2, characterized in that the arm (2) consists of a strip of metal plate which is shaped into a chute in the shape of a letter C which is almost closed in cross section. Border laundry according to Claim 3, characterized in that the arm (2) is made of galvanized flat steel.