AUXILIARY TOOL FOR CAREFULLY LEVELLING FINISHING FLOORS

Abstract: Starting from a mark (G) provided on a wall of the room, plugs are cut from a plastic rod (11), which is adjustable within a tube (1)of the tool, which is supported through legs (3; 23) by the underground. The cutting takes places at the location of a quantity of adhesive provided on the ground, so that the plug adheres to the ground. The upper surfaces of the plugs then indicate the correct height of the floor of flowing mortar to be provided. The correct plug height is obtained at each location when a laser receiver (9; 35) connected to the tube is conincident with a stationary positioned laser beam (20).

Description: The invention relates to an auxiliary tool for carefully levelling a finishing floor made of flowable mortar or similar material, whereby at each desired location of the floor, the exact height level for the finishing layer to be provided is plotted by means of a material plug, said tool comprising a laser receiver. Apart from horizontally level or extending with a predetermined slant the finishing floor should also be smooth in connection with the provision of floorcovering or the viewing of the floor if this also is the 'surface layer'. Up till now a board is used as auxiliary tool, said board carrying at its upper end a laser receiver or in that the laser beam simply becomes visible thereon if the laser beam passes the board. The board has at its lower end a horizontal transverse member, e.g. a tile. A bottom surface of the tile is kept in the same plane as a level mark provided on a wall of the building in which the finishing floor has to be provided (said mark being e.g. a couple of cms below the lower threshold of a door opening). Thereafter the laser receiver is adjusted at each desired floor location to the height of the laser beam and an amount of mortar is placed on the floor, the tile being pressed on top of the mortar until the laser beam coincides with the receiver, whereby the upper surface of the mortar amount indicates the exact floor height level. After the provision and the partial hardening of the floor the mortar plugs are removed and the holes formed thereby are filled with the same material as the finishing floor. It is also possible to hold with flowable mortar floors the board during flowing at the coinciding height of the laser beam until the layer, flowed onto the underground, reaches the lower surface of the board or tile respectively (see US-A-4,114,220). However, this second method is very inaccurate. The first mentioned method is laborious, because the location in which a mortar plug has to be provided, has first to be moistened by a brush and water, thereafter the located has to be made adhesive by mortar slurry (mortar having a large cement concentration) and subsequently the mortar has to be placed by means of a trowel. Thereafter the tile is placed onto the mortar and the height may be adjusted. Due to the laboriousness often one determines the height with large mutual spacings on the floor, which is not very accurate. Also often the moistening and making adhesive of the floor is eliminated whereby, if the underground floor is not very rough, the mortar does not adhere thereto and remains losely positioned. When thereafter the finishing floor is poured, said mortar plugs may shift whereby again inaccuracies occur. The invention aims at removing the said disadvantages. This is achieved according to the invention with an auxiliary tool comprising an outer tube which is adapted to be placed vertically through at least three supporting legs connected therewith, a rod or tube of plastic material being adapted to be provided in the outer tube and slidable relative to the tube, the material plug being cut from said plastic tube, a measuring pin, projecting transversely from the outer tube, being connected to said tube, as also is a laser receiver. Previously an amount of adhesive is provided in the measuring location on the floors, so that after lowering the plastic tube and cutting it, the cut portion, i.e. the plastic plug, adheres to the floor. The novel tool permits quick plotting of the heights, which may be done by one man and means a cost savings of 200 to 300% relative to the known method. There are no longer loose plugs, and due to the fact that they can easily be placed, they may be provided at smaller mutual spacings. 60 to 80 plugs per hour may be placed, so that per hour a space having an area of 400 to 500 m² may be prepared for the pouring of the finishing floor. From DE-A-2827521 a tool is known for levelling floors, comprising an outer tube, which is adapted to be placed vertically by means of three supporting legs connected thereto, a second tube being vertically slidable therewithin. Said second tube carries a graduation, as well as a horizontal plate at its lower end. The desired level of the plate above a location in the underground is adjusted through a sighting instrument or a laser beam. The flowable mortar has to be swept towards the floor location until it reaches the lower plate surface. This method is not very accurate. Furthermore a frame is known from EP-A-0077070, provided with a laser detector. A vertical tube is carried by the frame, which may be lowered onto an amount of adhesive present on the underground. As determined by coincidence of the laser beam a lower portion of said tube is cut therefrom through a circular saw, provided on the frame, whereby plugs are left on the floor, having the desired height. The apparatus has the disadvantage that it is voluminous and it requires an electric current supply towards the circular saw. In a preferred embodiment a pumping mechanism is secured to the outer tube said mechanism having a piston within the tube, said piston being adapted to move the plastic tube downwardly due to actuation of the pumping mechanism, while simultaneously moving the outer tube upwardly until the laser beam coincides with he receiver. When the plastic tube is cut flush with the lower end of the outer tube, the result is a plug having the desired height. In this embodiment it is not necessary to hold the outer tube by one hand at the height of coincidence of the laser beam, while the cutting has to be done by the other hand. It is advantageous in this embodiment if a knife is secured to the lower end of a rod which is connected to the outer tube parallel therewith and pivotal around its longitudinal axis, said rod being biased by a spring towards the non-operative position of the knife and may be actuated by means of a transverse handle provided at its upper end. Thereby it is not necessary to take a position with bent back close to the ground in order to cut the pastic tube. It is easier for gauging the tool, that is initially adjusting the lower end of the outer tube to the desired of the floor layer, if the measuring pin is provided adjacent to the upper end of the outer tube. Thereto usually in a building the so called meter level is marked on a wall, i.e. a mark, which is one meter above the desired floor level. In that case the measuring pin may be adjusted more accurately, because it is at eye level of the operator when he slightly bends his back. A somewhat simplified embodiment of the tool according to the invention is an embodiment in which the outer tube is displaceable against the bias of compression springs provided around the supporting legs such that the laser receiver coincides with the beam. In that case the tube has to be supported by hand against the spring bias during the cutting of the plug. In order to permit easy transport of the tool with the plastic tube from one location to another on the floor, preferably the rod or tube of plastic is connectable at its upper end to a lip provided with a screw threaded aperture with which a screw extending through a vertical guide slot in the tube of the tool is in engagement. Said screw is released for lowering the plastic tube on the supporting floor. It is preferable if a length scale is provided on the tube. Thereby the average height of the plastic plugs provided on the floor may be determined, which is the average thickness with which the finishing floor has to be provided. This permits determining of the necessary amount beforehand. In a preferred embodiment just below the tube end a horizontal guide for a knife or similar cutting member is fixed to the tube, said cutting member being insertable between said lower end and the guide, said guide being provided with a through-going aperture for the plastic tube. This furthers the quick provision of the plugs on the floor. It is to be preferred to provide the laser receiver vertically adjustable on the tube of the tool. The laser beam emitter which rotates horizontally, is adjusted at such height, that the emitted beam is free from obstacles present on the floor when reaching the laser receiver of the auxiliary tool according to the invention in all floor level adjusting locations. It may be advantageous therewith if also the laser receiver is provided vertically adjustable on the auxiliary tool. The laser beam emitter may also be positioned in an adjustably slanting plane relative to the horizontal plane. Thereby slanting finishing floors may be plotted. The invention will hereunder be further explained with reference to the drawing, showing an embodiment of the auxiliary tool according to the invention, given as an example. Fig. 1 shows a side view of a first embodiment of the tool, wherein the left part indicates the gauging and the right part placing the lower end at the desired floor level. Fig. 2 is a side view at an enlarged scale of the toolaccording to fig. 1, without the laser receiver. Fig. 3 is a bottom view of the tool. Fig. 4 shows a side elevation of a second embodiment of the tool. Fig. 5 shows, partially in vertical section, the tool as seen from the right in fig. 4. The first embodiment according to fig. 1 comprises a tube 1, around which a foot plate 20, having three supporting legs 23 has been provided. A similar plate 20a is secured to the upper end of the tube and carries a retractable or rotatable measuring pin 24. The spacing between the lower end of the tube 1 or the lower end of the foot plate 20 and said measuring pin is accurately 1 meter. A pumping mechanism is provided on top of the upper plate 20a, and has a piston rod 25, which carries at its lower end within the tube 1 a piston 26. The rod 25 is actuatable through handles 27, 28, whereby, if the movable handle 28 is gripped and moved towards the stationary handle 27, the piston rod 25 may be moved downwardly. A similar mechanism is known from so called adhesive spray guns. A vertical rod 29 is pivotably provided in the plates 20, 20a, said rod carrying at its lower end, just below the foot plate 20, a knife 30. The rod 29 is pivotal around its axis through a handle 31, provided at its upper end. Also a torsion spring is provided around the rod 29, which, after the handle 39 is released, returns the rod 29 to its starting position. This starting position is also visible in fig. 3. A guiding plate 33 is provided below the knife on the foot plate 20, the connecting ends of said guiding plate to the plate 20 being visible in fig. 3, whereas the plate itself is omitted therefrom in order to allow viewing the lower side of the plate 20. A vertical rod 34 is provided slidably and adapted to be fixed through a screw to the upper plate, said rod carrying, as appears from fig. 1, a laser receiver 35 at its upper end. The tool is operated as follows. By pivoting the lower handle 28 of the pumping mechanism downwardly from the position indicated in fig. 2, the piston rod 25 may be moved fully upwardly whereby the piston 26 becomes situated in the top of the tube. Thereafter a rod of tube of plastic material is inserted from below until its upper end engages the piston. First the tool is gauged. The height to which the floor is to be provided on the underground is indicated in the left part of fig. 1 by G. This height is e.g. derived from the threshold height of door openings in the room walls. Starting from the mark G, a distance of 1000 mms is scribed upwardly towards the height mark H, the so called meter level. This meter level is the gauging mark for the tool. The plastic rod is now moved downwardly by means of the pumping mechanism 27, 28. When this rod reaches the floor, the tube 1 will move upwardly when the pumping is continued. The gauging rod or measuring pin 24 is extended and the pumping is continued until the gauging pin is at the level of mark H. The spacing between the gauging pin and the knife 30 then also is 1000 mms. If now the plastic rod would be cut by the knife, the upper end of the plug cut therefrom is accurately at the floor level mark G. Now the laser receiver 35 is adjusted, through adjustment of the rod 34, to the height in which it coincides with the beam emitted by a laser emitter 36, which has been provided stationary in the room. During this procedure it is important that the tubes 1 also extend accurately vertically. Thereto a planar levelling intrument 36 is provided on the upper plate 20a. At spacings which are determined by the operator and varying from 1 to 5 meters, now on the floor through an adhesive spray gun, small amounts of adhesive are provided. Thereafter the tube 1 is placed over one of said adhesive portions. The plastic rod is now moved downwardly by actuation of the pumping mechanism 27, 28 and its lower end adheres to the adhesive quantity. When the pumping is continued, the rod 1 itself moves upwardly and one continues until the laser receiver 35 coincides with the laser beam. Thereafter the handle 32 is actuated whereby the knife 30 cuts the rod of material. In this manner plastic plugs may be provided all over the room, the upper ends of said plugs being at the height G above the floor. If thereafter the flowable floor or top layer is provided up to the height of the plugs, a floor is obtained, which accurately satisfies the required standards. Not only accurately horizontally levelling of floors is permitted, also slanting floors may be obtained. This may be realised by adjusting the laser beam under an angle with the horizontal. The second embodiment likewise comprises a tube 1, to which adjacent the lower end three starwise extending horizontal connection rods 2 are secured. Through each connecting rod 2 a vertical leg 3 is freely vertically movable as well as through starwise extending horizontal rods 4 secured to the tube 1 above the rods 2. The lengths 3 extend through apertures in the rods 4 and each have a flange between the rods 2 and 4, a com­ pression spring 6 being provided around the leg 3 between the rod 4 and the flange 5. A sleeve 7 is secured in the upper end of the tube 1, a rod 8A extending through said sleeve, whereby a laser receiver 9 is secured to the upper end. The rod 8A is vertically slidable in the sleeve 7 and may be secured therein by a clamping screw 10. From the lower end of the tube 1 a tube 11 made of a soft plastic material, which is easily cutable by a knife, may be inserted. The tube 8 consists an inner guide for the cylindrical plastic tube. In the embodiment shown the tube 11 is securable in the tube 1 in that a screw 12 extends through a guiding slot 13 for said screw in the tube 1. This screw also extends through a screw threaded aperture in a lip 14 within the tube 1, the lower end of which has a projecting point 15. After the plastic tube 11 has been inserted into the tube 1 and after the screw has been slid in the slot 13 until the point 15 is adjacent to the upper end of the plastic tube 11, the screw 12 is rotated to the right, so that the point 15 penetrates into the pastic tube and retains it. A length scale 16 has been provided along the guiding slot 13 on the exterior of the tube 1, so that the height of the plastic plug provided may be derived therefrom. A measuring pin 17 projecting beyond the corresponding leg 3 is secured to one of the rods 2 and also a knife guide 18 is secured to one of the rods 2, provided with an aperture 19 through which the plastic tube 11 may pass. Operation with the tool is as follows. The laser beam emitter device, only the laser beam 20 thereof being indicated in fig. 1, is switched on. During warming up of the laser device an amount of adhesive is placed at the intended measuring locations on the floor, on which the finishing layer has to be provided. A level mark 21 is provided on a wall of the room in which the floor is present, if this mark has not been provided before, e.g. a couple of cms below the threshold level of a door opening in the room. Now the tube 1 is placed such, through compression of the springs 6, that its lower end is flush with the level mark 21 which is facilitated in that the measuring pin 17 may be placed at the level of the level mark 21. Thereafter the laser receiver 9 is carefully adjusted to the height of the laser beam 20 by means of the screw 10. Thereafter the tube 1 is pushed downwardly at a measuring location, until the laser beam coincides with the receiver 9, so that than the lower end of the tube 1 is at a height spacing from the supporting floor that has to be attained with the finishing floor to be poured. The screw 12 is released and moved downwardly together with the plastic tube 11 until the lower end of the plastic tube reaches the adhesive on the floor. Thereafter the plastic tube 1 may be severed with a knife through a slot between the knife guide 18 and the lower end of the tube. This is done while retaining the tube 1 against the bias of the springs 6 at the height in which the laser beam 20 coincides with the receiver 9. Thereafter the tool may be transported towards a next measuring location. In this manner 60 to 80 plastic plugs or tube lengths may be provided on a floor having an area of 400 to 500 m², which takes about an hour. The length of plastic tube may be cut by a knife or saw, but may also be done by burning through it by a heated wire. If the length of the placed plastic plug is read for all plugs on the scale 16, it is possible to determine from all heights of the placed plugs the average height of the finishing layer to be provided. The plastic tube 11 continuously slides downwardly until it is practically consumed, whereafter a new plastic tube may be inserted. It is not imperative to secure the plastic tube by the screw 12, since the tube may also be retained by a thumb through the slot 13 when transporting the tool. It is only once necessary to adjust the laser beam height above the floor by adjusting the laser emitter or the height of the receiver 20 relative to the tube 1, in order to permit bringing the height of the plastic plugs everywhere on the floor in the plane through the level mark. Finally the tool may also be used with a water hose apparatus instead of a laser beam device. Thereby the correct level of the lower end of the tube 1 over the working floor is determined by two communicating vessels, one of which is provided to the tube 1, and one at a fixed distance above the level mark on the wall. Said vessels mutually communicate through a water filled hose and are both provided with a scale. If the water in the vessel connected to the tube is at the correct scale mark, the lower end of the tube 1 is at the intended level above the floor. However, this method is slower than that with a laser device. Apart from for building floors, the tool is also usable for providing finishing layers on solid undergrounds, such as concrete or asphalt roads, athletics courses and so on. Furthermore the floors may consist of concrete floors, sand, cement, covering floors or flowable mortar floors. For easy transport the tool may be provided with a handle 22.

Claims: 1. Auxiliary tool for carefully levelling a finishing floor made of flowable mortar or similar material, whereby the exact level for the finishing layer to be provided may be plotted at each desired location of said floor by a material plug, said tool comprising a laser receiver, characterized in that the tool comprises an outer tube (1) which is adapted to be placed vertically through at least three supporting legs (3; 23) connected therewith, a rod or tube (11) of plastic material being adapted to be provided in the outer tube and slidable relative to the tube, the material plug being cut from said plastic tube, a measuring pin (17; 24), projecting transversely from the outer tube, ing connected to said tube, as also is a laser receiver (9). 2. Auxiliary tool according to claim 1, characterized in that a pumping mechanism (27, 28) is secured to the outer tube (1), said mechanism having a piston (26) within the tube, said piston being adapted to move the plastic tube (11) downwardly due to actuation of the pumping mechanism, while simultaneously moving the outer tube (1) upwardly until the laser beam coincides with the receiver (9). 3. Auxiliary tool according to claim 1 or 2, characterized in that a knife (28) is secured to the lower end of a rod (29) which is connected to the outer tube (1) parallel therewith and pivotal around its longitudinal axis, said rod being biased by a spring (30) towards the non-operative position of the knife (28) and may be actuated by means of a transverse handle (32) provided at its upper end. 4. Auxiliary tool according to one or more of the preceding claims, characterized in that the measuring pin (24) is provided adjacent to the upper end of the outer tube (1). 5. Auxiliary tool according to claim 1, characterized in that the outer tube (1) is displaceable against the bias of compression springs (6) provided around the supporting legs (3) such that the laser receiver (9) coincides with the beam. 6. Auxiliary tool according to claim 5, characterized in that the rod or tube (11) of plastic material is adapted to be connected at its upper end to a lip (14) provided with a screw threaded aperture, a screw (12) extending through a vertical guiding slot (13) in the tube of the tool, being in engagement with said aperture, a length scale (16) being provided along the guiding slot (13) on the tube (11). 7. Auxiliary tool according to claims 5 or 6, characterized in that a horizontal guide (18) for a knife or similar cutting means, to be inserted between said lower end and the guide, is secured to the tube (1) just below the lower end of the tube (1), said guide having a through going aperture for the plastic tube (11). 8. Auxiliary tool according to one of the preceding claims, characterized in that the laser receiver (9) is provided vertically adjustable to the tube (1) of the tool.

Inventors: DE BREE, CORNELIS HERMANUS MARIA, REINCKE, MARINUS
Applicants: REDEXIM B.V.
Application year: 1988
Main classification: E04F21
IPC codes: E04G21, G01C15, E04F21