WO2001077462A1

WO2001077462A1 - Marking facility

Info

Publication number: WO2001077462A1
Application number: PCT/SE2001/000616
Authority: WO
Inventors: Thomas SVÄRDSTRÖM; Rolf Borrud
Original assignee: Svaerdstroem Thomas; Rolf Borrud
Priority date: 2000-03-22
Filing date: 2001-03-22
Publication date: 2001-10-18
Also published as: SE0000969D0; SE0000969L; SE514539C2

Abstract

The invention relates to a marking aid to permit the marking, on a sheet or other covering intended to cover a wall provided with beams, etc., of the position of electrical connecting boxes mounted in the wall, etc., or of other objects concealed therein. In accordance with the invention, the aid consists of a telescopically adjustable bar (5). At one end (5A) of the bar is a marking disc (6) or some other marking part, and at the other end (5B) of the bar are an impact part (7) and a centre pin (8, 81). The impact part (7) exhibits a holding part (11), which is so arranged as to make contact with the peripheral edge of an electrical connecting box of the kind in question at the marking stage.

Description

MARKING FACILITY

The present invention relates to a marking aid to permit the marking, on a sheet or other covering intended to cover a wall preferably provided with beams or on some other building element such as a floor or ceiling, of the position of electrical connecting boxes mounted in the wall or in some other building element such as a floor or a ceiling or of other objects concealed therein.

It is not easy to know where exactly to make a hole in a covering sheet in order to ensure that the hole is precisely in line with an electrical connecting box, for example, which is mounted internally in a wall or some other building element, such as a floor or a ceiling, and which is preferably provided with beams therein. A previously disclosed method involves the use of an aid for this purpose, such as magnetic or adhesive-provided markers or those of a kind which exhibit sharp-pointed pressure devices and mark the location of the item in question when, for example, pressure is applied to the wall sheet that will cover the item in question, so that the pressure device marks the location on the rear surface of the sheet with the help of the aforementioned marker, after which hole-cutting can take place from the rear surface of the sheet. The risk is considerable of such markers easily becoming lost among all the building materials and general rubbish on a building site, and it is also not possible to be sure that marking has taken place at the right place, as everything takes place on the rear surface of the sheet and as such is concealed from the person who is charged with the job of marking and subsequent hole-cutting. It is also possible to measure with a folding rule and remember the dimensions, although this can be a complicated operation and is not as precise as one might wish. The principal object of the present invention is thus, in the first instance, to solve the aforementioned problem by simple and effective means.

The aforementioned object is achieved by means of a marking aid in accordance with the present invention, which is characterized essentially in that the aid is in the form of a telescopically adjustable bar, a marking disc or some other marking part situated at one end of the bar and an impact part and a centre pin situated at the other end of the bar, in conjunction with which the aforementioned impact part exhibits a holding part which is so arranged as to make contact with the peripheral edge of an electrical connecting box, etc., in question during the marking stage.

The invention is described below as a number of preferred illustrative embodiments of the marking aid, in conjunction with which reference is made to the accompanying drawings, in which:

Fig. 1 shows a perspective view of a preferred illustrative embodiment of a marking aid; Fig. 1A shows part of a variant of a marking aid;

Fig. 2 shows an example of the use of one of the marking aid variants;

Figs. 3-5 show a plan view and a side view respectively of one end of a marking aid; Figs. 6 and 7 show examples of the marking sequence with the help of the marking aid in accordance with the invention;

Fig. 8 shows an installed sheet with drilled holes for the items in question before installation of the sheet at the user's site;

Fig. 9 shows examples of the telescopic bar of the aid and its parts;

Fig. 10 shows a marking disc viewed from one end; and Figs. 11 and 12 show the invention in schematic form applied with the aid held respectively under tension and under compression.

The invention can be applied to building elements of varying kinds, such as walls, floors and ceilings, which may incorporate beams or other reinforcing elements, and in the internal cavities of which, which are at least present before they are filled with insulation or other filling material, intended items such as electrical connecting boxes, etc., can be so arranged as to be installed. For the sake of simplicity, therefore, the invention is described below only as an example in the form of a wall fitted with beams with reference to the parts therein.

WORKING AREA

The marking aid in accordance with the present invention is an aid intended to be used in conjunction with building work, for example, where there is a requirement to be able to mark reference points in a simple fashion to make it possible subsequently to determine the location of the concealed items used as the starting point, such as electrical connecting boxes, ventilation ducts and floor drains, etc. With the marking aid there is no need to take measurements or to commit measurements to memory, since the dimensions are fixed.

DESCRIPTION OF THE MARKING AID

The marking aid can consist of a transparent plastic plate provided with, on the one hand, a 90-degree set-square on both sides for use with electrical connecting boxes (70-80 mm) and, on the other hand, a centre pin which passes through the plate. The plate is fitted to an extending arm provided with a marking disc on one part of the arm. The arm can be made of wood, plastic or metal. The fixed dimensions from the centre pin to the marking disc are ca. 550 mm, 970 mm and 1 350 mm. The marking aid weighs ca. 350 grams . The arm can be in the form of a round or square bar with chemical metal or a wear plate between the various parts of the telescopic arm. A self-adhesive tape or a tube can function as a handle and for decoration, and this may be luminous or painted in a bright colour to enable it to be found easily if the need arises.

GENERAL DESCRIPTION OF USE

The centre pin must be placed at the centre of round items once the location of the item has been marked, and marking must be performed in two directions. The closer to an angle of 90 degrees, the better. After marking, the item can be concealed by fitting a building board or a panel or by plastering over it, etc. The centre of the item can then be found by turning over the marking aid, placing the pin in one of the marks, and drawing an arc where the item is believed to be located. The procedure is then repeated from the other mark to produce a point of intersection where the arcs cross one another, and this marks the centre of the sought item. The corners can be marked out when marking square, rectangular or polygonal items .

GENERAL DESCRIPTION OF THE AID

A marking aid 1 in accordance with the present invention, which is intended to permit the user easily to mark the exact position of electrical connecting boxes 12 installed in a wall, etc., 4 or other items concealed therein, for example on a plaster board 2 or some other appropriate covering intended to cover a wall 4, preferably provided with beams 3-3⁴, a floor or a ceiling, consists of a telescopic bar 5 which carries a marking part 6 and an impact part 7; 107 and a centre pin 8. More specifically, the aid 1 consists of a telescopically adjustable bar 5 with a rotatably mounted marking disc 6 or some other suitable marking part, for example a drawing pencil or a spray nozzle, etc., situated at one end 5A of the bar. Situated at the other end 5B of the bar is an impact part 7,-107 together with a laterally 9,10 projecting centre pin 8, δ^-lOS, 108¹. The aforementioned impact part 7; 107, which can be in the form of a transparent plate, exhibits a similarly laterally 9,10 projecting holding part 11, ll¹; 111, 111¹, which is so arranged as to make contact with the peripheral edge 12A of an electrical connecting box 12 or other intended item of the kind in question, the position of which it is wished to mark at the marking stage, as shown in Figs 2, 5 and 6.

The aforementioned holding part 11 , ll¹; 111, 111¹ is arranged with its opening 13,113 facing in a direction 14 away from the connection 16 between the bar 5 and the aforementioned impact part 7,107 and in a direction 15 towards the connection 16 between the bar 5 and the impact part 107.

The holding part 11, ll¹; 111, 111¹ is preferably executed as an angle, as' shown in the drawings, and the angle between the legs is preferably a right angle.

A pointed centre pin 8, 8¹; 108, 108¹ is located at the centre of the impact part and projects laterally 9,10 at a right angle from the aforementioned impact part 7; 107. Centre pins 8 , 8¹; 108 , 108¹, each extending in a direction 9,10 away from the impact part 7; 107, are preferably situated at separate distances A,B;CA,CB from their respective holding part 11, ll¹; 111, 111¹. It can be mentioned by way of example that, for a connecting box 12 with the diameter 70 mm, the distance A is selected at 36.5 mm, and for a connecting box with the diameter 80 mm, the distance B is selected at 41.5 mm.

The telescopic, length-adjustable bar 5 exhibits locking devices 17,18, which are so arranged as to be activated in the extended connected position I and thus to hold the parts Ξ¹^²^³ of the bar together passively after having first been activated in the extended position. The locking devices are in the form preferably of a spring 17 and a ball 18, which is accommodated internally, and the ball can extend partly through the opening 19 in the parts S¹^²^³ of the bar. Locking devices of other designs are also possible.

A marking disc 6, which functions as a marking part, is mounted about a bearing shaft 21 extending in the longitudinal direction 20 of the bar, which shaft may be in the form of a threaded bolt, and the aforementioned marking disc 6 exhibits a lead washer extending in the peripheral direction 22 of the bearing shaft 21, the function of which washer is to leave a mark on the item with which it is in contact . The function of the invention in conjunction with marking the positions of a number of electrical connection boxes 12A-12D in a wall 4 provided with vertical beams 3-3⁴ is indicated below with reference to Figs . 6 and 7.

Fig. 6 shows a beamed wall 4 with installed electrical connection boxes 12A and 12B. The wall 4 will be insulated, for example, and provided with some form of covering, such as plasterboard sheets 2, which will conceal the electrical connection boxes. Before fixing the covering 2, the position of the box is marked with the marking aid by laying the plate with the contact angle over the box 12A or 12B, depending on which box is fitted. In this case, marking can only be effected on the beams 3²,3³ which are not entirely concealed by the covering 2. The box 12A has its reverence points or, more accurately, part of the marking arcs Al and A2 , on the same beam 3² on which a plate 2, for example, will conceal half the beam 3². The box 12B has one reference point B3 on the same beam as box 12A and one reference point B4 on another beam 3³. The covering 2 is now hung from the top edge with a number of loosely tightened screws. The boxes 12A, 12B are now entirely concealed. The marking aid is then turned over, and the pin δ^¹ is placed in the plate 2 on the mark Al and A2, and the marking disc 6 is used to draw an arc 50,51 and 52,53 from each reference point where the connection box is believed to be located, and the result is a cross at the point where the arcs intersect. This cross indicates the centre of the box; the centre bit of the box drill is placed here and a hole is sawn in the sheet 2 which covers the box. The same procedure is then repeated with box B3. The sheet 2 can then be fixed permanently over the beams 3 . ¹- , 3² .

Fig. 7 shows that the marking for further boxes 12C,12D ends up on covering sheet 2, and the marking C1,C2 ,D1,D2 , 54 , 55, 56, 57 is accordingly easier to produce, because there is now no longer any need to use the beams for marking. It is then simply a case of continuing to make marks , in this way for the items concerned along the entire wall.

The invention is not restricted to the illustrative embodiments described above and shown in the drawings, but may be varied within the scope of the Patent Claims without departing from the idea of invention. For example, the holding part can be curved, and there can be an angle other than 90° on the holding part. The locking devices for the bar can also be made of screwed friction joints.

Claims

PATENT CLAIMS

1. Marking aid (1) to permit the marking, on a sheet (2) or other covering intended to cover a wall (4) preferably provided with beams (3) or on some other building element such as a floor or ceiling, of the position of electrical connecting boxes (12) mounted in the wall (4) or in some other building element such as a floor or a ceiling or of other objects concealed therein, characterized in that the aid (1) is in the form of a telescopically adjustable bar (5) , a marking disc (6) or some other marking part situated at one end (5A) of the bar and an impact part (7; 107) and a centre pin (δ^¹) situated at the other end (5B) of the bar, in conjunction with which the aforementioned impact part exhibits a holding part 11, ll¹; 111, 111¹ which is so arranged as to make contact with the peripheral edge (12A) of an electrical connecting box (12), etc., in question during the marking stage.

2. Marking aid in accordance with Patent Claim 1, characterized in that the impact part (7; 107) is in the form of a transparent plate.

3. Marking aid in accordance with one or other of Patent Claims 1-2, characterized in that the holding part

(11, ll¹) is arranged with its opening (13) facing in a direction (14) away from the connection (16) between the bar (5) and the impact part (7) .

4. Marking aid in accordance with one or other of Patent Claims 1-2, characterized in that the holding part

(111, 111¹) is arranged with its opening (113) facing in a direction (15) towards the connection (16) between the bar (5) and the impact part (107) .

5. Marking aid in accordance with one or other of the above Patent Claims, characterized in that the holding part (11, ll¹; 111, 111¹) is executed as an angle, and in that the angle is preferably a right angle in a direction (15) towards the connection (16) between the bar (5) and the impact part (107) .

6. Marking aid in accordance with one or other of the above Patent Claims, characterized in that a centre pin

(8, 8¹;108, 108¹) is located at the centre of the impact part and projects at a right angle from the impact part (7; 107) .

7. Marking aid in accordance with Patent Claim 6, characterized in that centre pins (8 , 8¹; 108 , 108¹) , each projecting in a direction (9,10) away from the impact part

(7;107), are situated at separate distances (A,B;CA,CB) from their respective holding part (11, ll¹; 111, 111¹) .

8. Marking aid in accordance with one or other of the above Patent Claims, characterized in that the telescopic, length-adjustable bar (5) exhibits locking devices which are so arranged as to be activated in the extended position and thus to hold the parts of the bar together in an extended position.

9. Marking aid in accordance with Patent Claim 8, characterized in that the locking devices are in the form of a spring (17) and a ball (18) or a screwed friction joint.

10. Marking aid in accordance with one or other of the above Patent Claims, characterized in that a marking disc (6) is rotatably mounted about a bearing shaft (21) extending in the longitudinal direction (20) of the bar, and in that the marking disc (6) exhibits a lead washer extending in the peripheral direction (22) .