DE20313062U1 - Device for loosening of especially glued floor coverings has cutting blade which in cutting section has cutting teeth located next to each other and tapering away in direction from base body and with at least one cutting surface - Google Patents

Abstract

The device for the loosening of especially glued floor coverings has a cutting blade with a base body (40) and at least one cutting section (20), whereby the cutting blade in the cutting section has at least two cutting teeth (1-5) located next to each other and tapering away in the direction from the base body and with at least one cutting surface on their respective outer edges. The cutting surfaces of the individual teeth run into each other and form a continuous cutting edge.

Description

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Applicant :

VOGT Construction Equipment GmbH, 95466 Weidenberg

Designation:

Device for removing deposits

Description

The invention relates to a device for removing coverings, in particular glued floor coverings or adhesives. 5

During building renovations, floor coverings, wall coverings or roof coverings often have to be removed or removed from a substrate, the floor, wall or roof. Such coverings, especially floor coverings such as PVC flooring, carpets, parquet or laminate flooring, are often glued to the substrate, usually a screed or floorboards, with adhesives. In these cases, the coverings and the adhesive layers adhere particularly strongly to the substrate and purely manual removal is very laborious. For this reason, devices have become known in which a cutting blade (or scraper blade) with a cutting edge at the front end is used and the cutting blade oscillates or vibrates in the cutting direction perpendicular to the cutting edge by means of a drive. In addition to electric eccentric drives, pneumatic drives are particularly well known, which work using mobile mains-powered compressors.

The company Vogt Baugeräte GmbH has a device sold under the name Vogthammer (registered trademark) that has an elongated handle or handle, at the upper end of which a hose for supplying compressed air opens out and at the lower end of which a piston drive is pneumatically operated via the compressed air. A cylindrical shaft of a holder can be clamped to the lower end of the piston drive, to the other end of which a scraping or cutting tool for removing the coating is attached with screws and can be replaced when worn. In the company brochure for the Vogthammer, various tools are suggested, in particular delta-shaped knives and scrapers of various designs as well as combined tools.

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with scraper blades and crossed blades for simultaneous cutting of the floor coverings (see also DE 290 21 353 Ul).

All of these known tools or cutting blades have a base plate and a transverse, straight cutting edge on the front edge, which is located at the end of a triangular bevel on the base plate that tapers downwards. These tools have proven to be very useful in practice. However, in recent years, elastic adhesives have been used, for example under the trade names Thomsit P670 (Henkel K6), Sika Bond-T54, T52 or MS-Elastik (Schönox), especially when laying parquet or laminate flooring. These adhesives are not applied flat to the substrate, but only in spaced-apart strips or adhesive beads. These adhesives therefore have an integrated soundproofing and impact insulation function. However, these elastic adhesives have an extremely strong adhesive strength, as the adhesive surface is much smaller. This means that considerable problems arise in practice when disposing of parquet or laminate and the elastic adhesives used in them.

The invention is based on the object of specifying a device for removing coatings with which even strongly adhering coatings can be removed.

This object is achieved according to the invention with the features of claim 1.

The device according to claim 1 is suitable and intended for detaching (or: removing, peeling off, removing) coverings, in particular glued floor coverings, from a substrate and comprises a) at least one cutting blade (or: scraper, removal blade) with a

Base body and at least one cutting area, wherein

b) the cutting blade in the cutting area has at least two cutting teeth arranged next to one another, each tapering in the direction away from the base body, on the outer edges (or: front

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end or edge regions) each having at least one cutting edge (or cutting edge).

The invention is based on the surprising discovery that without increasing the force applied or the cutting frequency or the cutting sharpness of the cutting edge of the cutting blade used, but simply by dividing the cutting area into individual cutting teeth that taper towards the front and thus a corresponding toothing of the cutting edge, a considerable improvement in the removal or detachment properties of the device is achieved and with the cutting blade designed in this way, even stubborn adhesive deposits, in particular elastic, highly adhesive adhesives such as elastic adhesives or whisper adhesives, can be removed from a substrate purely mechanically without chemical solvents. Obviously, with the cutting blade that is set into vibration by a drive in the preferred use, the complex interplay of cutting or separating processes, adhesion forces between the adhesive material and the cutting blade, and elastic restoring forces of the adhesive material are positively influenced by the vibrations of the cutting blade generated by the drive in such a way that, on the one hand, the adhesive material is severed in sufficient quantities with each vibration of the cutting blade and, on the other hand, the adhesive material does not clog or hold the cutting blade in place. The teeth of the blade can be individually adjusted to the coating to be removed.

Advantageous embodiments and further developments according to the invention emerge from the claims dependent on claim 1.

In a first, particularly advantageous embodiment, the cutting edges of the individual cutting teeth form a continuous cutting edge, i.e. they are designed to be directly adjacent to one another. This enables a particularly good cutting or separating effect to be achieved.

Preferably, each cutting tooth forms a tip and then generally has two tooth flanks which meet or enclose one another at the tip at a predetermined opening angle. This opening angle of the cutting tooth or teeth is generally between 30° and 120°, in particular between 45° and 110° and

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preferably between 50° and 108°. These tips also tear the coating and separate it into two parts at the tip, thereby reducing the forces required for the surface removal of the coating by the linear cutting edges. However, a rounded tip or front area of the incisors can also be provided.

The opening angles of all cutting teeth are in particular the same. In addition, the flanks of the or each cutting tooth are essentially straight or linear, resulting in a triangular shape of the cutting teeth. Preferably, the flanks and the tip of the or each cutting tooth essentially form an equilateral triangle, i.e. the two flanks are essentially the same length.

Between adjacent cutting teeth, their flanks preferably meet at a tip directed towards the base body at an associated intermediate angle. The values for the intermediate angles between the cutting teeth are selected in particular from a range between 30° and 120°, in particular between 45° and 110° and preferably between 50° and 108°. The intermediate angles between different pairs of adjacent cutting teeth are also preferably essentially the same.

In addition, the intermediate angles between the cutting teeth and the opening angles of the cutting teeth are all chosen to be the same. This creates similar cutting conditions both at the tips of the cutting teeth and at the tips of the incisions between them.

In another embodiment, the cutting teeth can also be spaced apart from one another, in particular their flanks do not meet one another.

In a particularly advantageous and production-friendly embodiment, the cutting blade has two essentially flat surfaces facing away from one another, at least in the cutting area and preferably also in the area of the base body, and the cutting edges of the cutting teeth are arranged on an edge area connecting the two surfaces on one end face, preferably on one of the two, preferably the

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lower surfaces in relation to the coating to be removed at their common edge with the edge area. With such a plate-shaped cutting blade, production is possible from a metal sheet of a predetermined thickness or strength by cutting out the cutting teeth, for example by laser cutting and then grinding the cutting edges. The inward-facing cutting angle or grinding angle of the cutting edge(s) of the cutting teeth generally has a value between about 5° and about 20°, preferably about 13°. This sharpness of the cutting edge has proven to be optimal.

The absolute and relative dimensions of the cutting teeth can be used to further optimize their separating and detaching effect on the coating. Values between about 10 mm and about 40 mm, preferably between 15 mm and 30 mm, have proven to be advantageous as absolute values for the length (or tooth height) of each cutting tooth measured from the base body outwards in a longitudinal direction. These lengths of the cutting teeth are generally chosen to be essentially the same.

As relative values for the lengths of the cutting teeth, values between about 1/20 and about 1/5 of the width of the cutting area measured in the transverse direction and/or between about 1/10 and about 1/4 of the length of the entire cutting blade measured in the same direction have proven to be advantageous.

Furthermore, a parallel arrangement of the cutting teeth is preferred such that the tips or front areas of the cutting teeth of the cutting blade lie essentially on a line which runs in particular perpendicular to a cutting direction or longitudinal direction of the cutting blade. However, an arrangement of the cutting teeth or their tips or front areas along a, preferably convex, curved curve is also possible.

In a particularly advantageous embodiment, the device additionally comprises a holder to which one or more cutting blades are or can be attached in a removable or replaceable manner, in particular by means of at least one screw connection, and preferably also a drive which is or can be connected to the holder, in particular detachably.

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and moves the holder together with the cutting blade in a cutting direction forwards and possibly also backwards if the counterpressure when moving the blade forwards alone is not sufficient. The cutting direction is generally directed from the base body to the cutting teeth, especially their tips.

In a particular embodiment, at least two cutting blades can be arranged one above the other or held on the holder, wherein the cutting teeth are preferably arranged offset from one another and/or the rows of teeth lie one above the other or are also offset from one another.

The drive movement of the cutting blade is generally substantially periodic and in particular has a frequency between about 10 Hz and about 100 Hz, preferably between about 30 Hz and about 70 Hz. The drive is preferably a pneumatic drive and works in particular with compressed air in a range between 3 bar and 10 bar, preferably between 5 bar and 7 bar. The device also preferably comprises a gripping rod, at the front end of which the drive is arranged, wherein the holder can be clamped or inserted at the front end of the drive.

The invention is explained in more detail below using exemplary embodiments. Reference is made to the drawings, in which FIG. 1 shows an exemplary embodiment of a cutting blade with five cutting teeth in a top view,

FIG 2 the cutting blade according to FIG 1 in a side view, FIG 3 an embodiment of a cutting blade with only three cutting teeth in a plan view,

FIG 4 shows an embodiment of a cutting blade with four cutting teeth, FIG 5 shows a device with a cutting blade and a holder and FIG 6 shows a device with a cutting blade, a holder and a drive

are each shown schematically. Corresponding parts and sizes are provided with the same reference numerals in FIGS. 1 to 6.

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In all embodiments, the cutting blade (or: scraper, cutting knife) 20 has a base plate (or generally: base body) 40 and a cutting area 50 arranged in a front area shown on the left in FIGS. 1 to 4. The base plate 40 is in turn divided into an intermediate area 43 directly adjacent to the cutting area 50 and a connecting area 44 adjacent to the intermediate area 43 on the side facing away from the cutting area 50. In the connecting area 44, two openings 41 and 42 are provided, which can be square, for example, as shown, with which the entire cutting blade 20 can be attached to a holder shown only in FIGS. 5 and 6.

In the cutting area 50, in each of the cutting blades shown, several triangular cutting areas or cutting teeth are arranged next to one another in the transverse direction of the cutting blade 20 in the plan view of the plate plane of the cutting blade 20 (FIG 1, FIG 3 and FIG 4). The width of the cutting area in this transverse direction is designated by B. The longitudinal direction of the cutting blade 20 runs parallel to a cutting direction designated by S, in which the cutting blade 20 is moved and cuts into the covering to be removed with the cutting area 50 or separates it from the substrate.

In FIG 1, five identically designed cutting teeth 1, 2, 3, 4 and 5 are arranged next to one another. In the embodiment according to FIG 3, only three cutting teeth 6, 7 and 8 are provided and in the embodiment according to FIG 4, four cutting teeth 9, 10, 11 and 12 are provided next to one another.

Each cutting tooth 1 to 12 has a tip 51 to 62 projecting forward in the cutting direction S and is designed as an equilateral triangle. The tips 51 to 62 are at the same height as seen in the cutting direction S or on a line running in the transverse direction.

The opening angle of each cutting tooth 1 to 12 at the tip 51 to 62 between the tooth flanks is the same and is designated with α. Along the tooth flanks running inwards from the tips 51 to 62 (or:

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Cutting edges or cutting edges 21 to 32 are formed on the (sides of the triangle) of the corresponding cutting teeth 1 to 12.

The cutting edges 21 to 32 are formed on the edge or the outer edge of an edge region rising at an opening angle β (see FIG. 2) up to the full thickness d of the cutting blade 20 between the flat sides of the plate, in particular linearly or triangularly in cross-section. The angle β on the cutting edge is ideally 13°, but can also deviate slightly from this, for example by up to 5° upwards or downwards.

The cutting edges 21 to 32 meet at the incisions between the cutting teeth 1 to 12 at an acute intermediate angle γ, so no straight or otherwise running intermediate areas or spacings between the cutting teeth 1 to 12 are provided in the embodiments shown. However, in an embodiment not shown, an intermediate area or a spacing of the cutting teeth 1 to 12 in the transverse direction could also be provided.

The length of the cutting teeth 1 to 12 measured in the cutting direction S is designated by H and extends in particular from the tips 51 to 62 to the tips of the incisions between the cutting teeth 1 to 12. The total length, measured in the cutting direction S, of the cutting region 50 and the intermediate region 43 is designated by 1 and the total length of the cutting blade 20, measured in the cutting direction S, is designated by L.

While the cutting blade 20 retains the width B of the cutting area 50 in the intermediate area 43, it tapers towards the rear area in the connecting area 44, in particular in a straight line. The width at the rear end of the connecting area 44 is designated b. The transitions between the straight edges of the trapezoid of the connecting area 44 formed thereby are rounded.

In the embodiments according to FIGS 1 to 4, the following values are chosen for the specified sizes:

Example according to FIG 1:

·

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Length of the five cutting teeth 1 to 5: Opening angle of the cutting teeth 1 to 5: Intermediate angle between cutting teeth: Width of the cutting area 50: Length of cutting area 50 and intermediate area 43:
Total length of the cutting blade 20: rear width of the connection area 44:

Example according to FIG 3:

H = 30 mm, &agr; = 68° &ggr; = 68° B = 200 mm,

1 = 90 mm, L = 150 mm b = 72 mm.

Length of the three cutting teeth 6 to 8: Opening angle of the cutting teeth 6 to 8:

Intermediate angle between cutting teeth: Width of cutting area 50: Length of cutting area 50 and intermediate area 43:
Total length of the cutting blade 20:

rear width of the connection area 44:

H = 20 mm, α = 92°
γ = 92° B = 120 mm,

1 = 70 mm, L = 150 mm b = 86 mm.

Example according to FIG 4:

Length of the four cutting teeth 9 to 12: Opening angle of the cutting teeth 9 to 12:

Intermediate angle between cutting teeth:

Width of cutting area 50:

Length of cutting area 50 and intermediate area 43:
Total length of the cutting blade 20:

rear width of the connection area 44:

H = 25 mm, α = 63°
γ = 63° B = 120 mm,

1 = 70 mm, L = 150 mm b = 86 mm.

Likewise, all combinations of the embodiments according to FIGS. 1 to 4 are possible, in particular other combinations of the specified values 35 H, α, γ, B, 1, L and b, and of course other dimensions.

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The typical diameter of the opening 41 to 42 is 11 mm and their distance measured from the centers is slightly smaller than the width b. The cutting blade 20 preferably consists of a steel sheet, in particular a CK 85 or CK 101 hardened spring steel. The strength or thickness of the sheet d is typically between 1.5 mm and 2.5 mm.

FIG 5 shows a cutting blade 20, for example according to FIG 1, which is detachably connected in the connection area 44 to a holding plate 34 of a holder 30 via two screw connections 31 and 32 passed through the openings 41 and 42 - not visible in FIG 5. The holder 30 also has a cylindrical connecting rod 33.

According to FIG 6, the connecting rod 33 of the holder 30 is detachably clamped in a drive 70, which causes the holder 30 with the cutting blade to oscillate periodically in the axial direction as the cutting direction S in order to release the covering 80, for example an adhesive covering of a parquet or laminate floor, from a substrate 81, for example a screed. The drive 70 is a pneumatic drive, for example a piston drive with a forward-beating stroke movement, and is supplied with compressed air via a compressed air hose 72. The pressure of the compressed air is typically 6 bar or 7 bar. The vibration frequency of the drive 70 and thus of the holder 30 with the cutting blade 20 is typically 1960 rpm or 3200 rpm, but can also assume other values in between or outside of this. An electric drive, in particular an eccentric drive with a gear that converts a rotation of a motor into a linear movement, can also be provided. A gripping rod 71 or handle is provided for guiding the entire device.

In addition to the horizontally cutting cutting blade 20, one or more parallel vertical cross blades 64 according to DE 200 21 353.9 can also be exchangeably attached to the holder 30, as shown in FIGS. 5 and 6, via screw connections 68 for cutting the covering in the cutting direction.

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11

List of reference symbols

1 to 12 Cutting tooth 20 Cutting area 30 holder 31, 32 Screw connection 34 Retaining plate 40 Base body 41, 42 opening 43 Intermediate area 44 Connection area 50 Cutting area 51 to 62 Great 64 Cross blade 68 Screw connection 70 drive 71 Grip handle 72 Compressed air hose 80 Covering 81' Underground L ₅ I length H length b, b Width α, β, Y angle

Claims (33)

1. Device for removing coverings, in particular glued floor coverings or adhesives, with a) at least one cutting blade with a base body (40) and at least one cutting area (20), wherein b) the cutting blade has in the cutting region at least two cutting teeth (1 to 12) arranged next to one another, each tapering in the direction away from the base body, on the outer edges of which at least one cutting edge (21 to 25) is formed. 2. Device according to claim 1, wherein the cutting edges of the individual cutting teeth merge into one another and form a continuous cutting edge. 3. A device according to claim 1 or claim 2, wherein each cutting tooth tapers to a point or to a rounded front region. 4. Device according to claim 3, in which each cutting tooth has two flanks which meet at the tip at a predetermined opening angle or are connected via the front region. 5. Device according to claim 4, wherein the opening angle of each cutting tooth or teeth is generally between 30° and 120°, in particular between 45° and 110° and preferably between 50° and 108°. 6. Device according to claim 4 or claim 5, wherein the opening angles of all cutting teeth are the same. 7. Device according to one of claims 4 to 6, in which the flanks of the or each cutting tooth are substantially straight. 8. Device according to one of claims 4 to 6, in which the flanks and the tip of the or each cutting tooth form substantially an equilateral triangle or the two flanks are substantially equal in length. 9. Device according to one of claims 4 to 8, in which the flanks of two adjacent cutting teeth meet at a tip directed towards the base body at an associated intermediate angle. 10. Apparatus according to claim 9, wherein the intermediate angles between different pairs of adjacent cutting teeth are substantially equal. 11. Apparatus according to claim 9 or claim 10, wherein the intermediate angles between the cutting teeth and the opening angles of the cutting teeth are all equal. 12. Device according to one of claims 9 to 11, in which the intermediate angle between the cutting teeth is selected in a range generally between 30° and 120°, in particular between 45° and 110° and preferably between 50° and 108°. 13. Device according to one of claims 1 to 8, in which the cutting teeth are spaced apart from one another, in particular their flanks do not meet one another. 14. Device according to one or more of the preceding claims, in which the cutting blade has two essentially flat surfaces facing away from one another at least in the cutting region and preferably also in the region of the base body, and the cutting edges of the cutting teeth are arranged on an edge region connecting the two surfaces on one end face. 15. Device according to claim 14, in which the or each cutting edge of each cutting tooth is arranged on one of the two surfaces, preferably the lower surface with respect to the coating to be removed, at its common edge with the edge region. 16. Device according to one or more of the preceding claims, wherein each cutting edge of each cutting tooth has an inwardly directed cutting angle between about 5° and about 20°, preferably about 13°. 17. Device according to one or more of the preceding claims, wherein the length of each cutting tooth measured outward from the base body is at least 10 mm. 18. Device according to one or more of the preceding claims, wherein the length of each cutting tooth measured outwards from the base body is at least 15 mm. 19. Device according to one or more of the preceding claims, wherein the length of each cutting tooth measured outwards from the base body is at most 40 mm. 20. Device according to one or more of the preceding claims, in which the lengths of the cutting teeth measured outwards from the base body are substantially equal. 21. Device according to one or more of the preceding claims, in which the lengths of the cutting teeth measured outwards from the base body are selected to be between approximately 1/20 and approximately 1/5 of the width of the cutting area measured in the direction running transversely thereto. 22. Device according to one or more of the preceding claims, in which the length of the cutting region and the cutting teeth measured in a longitudinal direction from the base body to the cutting region is selected to be between approximately 1/10 and approximately 1/4 of the length of the entire cutting blade measured in the same direction. 23. Device according to one of the preceding claims, in which the cutting teeth, in particular the tips or front regions of the cutting teeth, of the cutting blade lie substantially on a line which runs in particular perpendicular to a cutting direction or longitudinal direction of the cutting blade. 24. Device according to one or more of the preceding claims, wherein the cutting blade consists of steel, in particular a steel sheet, preferably with a thickness between 1 mm and 5 mm. 25. Device according to one or more of the preceding claims with a holder to which at least one cutting blade is or can be attached in a removably or replaceably manner, in particular by means of at least one screw connection. 26. Device according to one or more of the preceding claims, in which at least two cutting blades are provided, the cutting areas with the cutting teeth being arranged one above the other or offset in the cutting direction. 27. Device according to claim 26, wherein the cutting teeth of the two cutting blades are arranged offset from one another, in particular laterally or perpendicular to the cutting direction. 28. Device according to one of claims 25 to 27, a drive which is connected or connectable to the holder, in particular detachably, and moves the holder together with the cutting blade in a cutting direction at least forwards and backwards by pressure against the covering or also mechanically. 29. Device according to claim 28, wherein the cutting direction runs essentially from the base body to the cutting teeth, in particular their tips, of the cutting blade. 30. Apparatus according to claim 28 or claim 29, wherein the movement of the cutting blade is substantially periodic and in particular has a frequency between about 10 Hz and about 100 Hz, preferably between about 30 Hz and about 70 Hz. 31. Device according to one or more of claims 25 to 30, wherein the drive is a pneumatic drive and is operated in particular with compressed air in a range between 3 bar and 10 bar, preferably between 5 bar and 7 bar. 32. Device according to one or more of claims 25 to 31 with a gripping handle, wherein the drive is arranged at a front end of a gripping handle and the holder can be clamped or inserted at the front end of the drive. 33. Device according to one or more of claims 25 to 32 with at least one cross blade arranged crossed to the cutting teeth, which is fastened or can be fastened to the holder, for cutting the covering.