Cutting device
The cutting tool addresses the issue of limited accuracy in existing tools by using a stable metal holder with ball bearings and suction cups for precise cuts and secure positioning, ensuring minimal gaps and enhanced drying capabilities.
Patent Information
- Application Number
- EP2025151582
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-01-11
- Filing Date
- 2025-01-13
- Publication Date
- 2025-07-16
AI Technical Summary
Existing cutting tools for floor coverings suffer from limited dimensional accuracy and complexity, resulting in visible gaps between cutouts and openings.
A cutting tool with a stable holder made of metal or fiber-reinforced plastic, featuring ball bearings at corners for smooth guidance, suction cups for secure positioning, and adjustable blades for precise cuts.
Enables precise and accurate cuts with minimal gaps, allowing for seamless reinsertion and improved drying methods for damp floors.
Smart Images

Figure IMGAF001_ABST
Abstract
Description
[0001] The invention relates to a cutting tool or a cutting device or a cutting tool designed for cutting out a section of a preferably air-impermeable floor covering lying on a substrate, e.g. a carpet, linoleum, vinyl or the like, with a holder that can be placed on the floor covering and a blade holder arranged in this holder and movable relative to the holder via an actuating element, which blade holder is rotatable to perform a cutting movement. One or more blades are attached to the blade holder in such a way that they cut into the floor covering when the cutting movement is performed in order to cut the section out of the floor covering. State of the art
[0002] Various cutting tools are known for cutting out the cutout from the floor covering. All known cutting tools have in common that they only allow for limited dimensional accuracy and are relatively complex. Limited dimensional accuracy in this context means that a gap is often created between the cutout and the opening created in the floor covering during the cutting process, which is visible when the cutout is reinserted into the floor covering. Task
[0003] Based on the known prior art and the associated disadvantages, the invention is therefore based on the object or technical problem of providing a cutting tool which enables a particularly precise cutout in the sense of very good dimensional accuracy and positioning of the cutting tool on the floor covering to be cut. invention
[0004] According to the invention, this object is already achieved by the features of the independent claim. Preferred, but not mandatory, features are recited in the subclaims.
[0005] In the simplest embodiment, this task is therefore solved by the holder being designed to be particularly stable so that it forms the most even and smooth guide possible with its inner side for the knife holder.
[0006] In the preferred embodiment, this is achieved by the holder being made of metal, in particular steel or fiber-reinforced plastic, which has a wall thickness of 25 to 35 mm, preferably 30 mm and more, and thus realizes a particularly stable and dimensionally accurate running surface for the bearings between the knife holder and the holder.
[0007] In a first embodiment, the holder is designed as a circumferentially closed retaining ring, which forms a running surface with a retaining ring inner side when carrying out the relative movement between the stationary holder and the relatively movable knife holder.
[0008] In one embodiment, bearings are arranged between the holder and the knife holder. This design is particularly stable when ball bearings are used, but plain bearings are also possible.
[0009] The knife holder preferably has multiple edges, namely longitudinal edges extending in a longitudinal direction and transverse edges extending between the longitudinal edges, which thus extend transversely to the longitudinal direction and thus intersect the longitudinal edges at corners. The bearings are preferably arranged at the edges or corners, particularly preferably in the corners, especially in all corners, so that a particularly harmonious and smooth running of the edges on the inside of the retaining ring is realized.
[0010] A particularly stable and thus smooth-running design provides for bearings in two or more levels between the knife holder and the retaining ring. In the preferred embodiment, the bearings are arranged on the knife holder.
[0011] Particularly preferably, the knife holder is rectangular in shape, in particular constructed with a square geometry.
[0012] As mentioned above, it has been found to be particularly useful for a harmonious force distribution to arrange the bearings at or in the corners of the knife holder, and in particular at each corner.
[0013] The fixing devices are used to secure the holder in a desired position on the substrate. The desired position is defined as the position that fixes the holder in the desired orientation on the substrate. They are used to hold the holder in the desired position relative to the substrate, ensuring that the holder always remains in the desired position even when performing multiple cuts or multiple movements.
[0014] Preferably, the fixing means comprise two arms extending diametrically opposite each other from the central rotation axis of the holder. These arms can be connected to the holder either permanently or in a foldable manner, allowing them to be converted from a raised transport position to a lowered working position.
[0015] The floor covering is expediently designed in such a way that the fixing devices can be attached to or on it.
[0016] The fixing means for securing the holder in the desired position can further comprise one or more suction cups. A suction cup is understood to be a device comprising sealing lips for firmly adhering the retaining ring to the floor covering. These sealing lips can thus be placed against the surface of the floor covering. A vacuum can be applied to the suction cup, preferably by means of a pump, which can also be integrated into the suction cup, e.g., a hand pump or a pump integrated into the device.
[0017] The suction cups can be connected to the arms or connectable, i.e. attached to the holder via the arms at the side.
[0018] The suction cups comprise a suction seal with a circumferential sealing lip that can be placed against the floor covering. By activating the pump or another device for applying vacuum to the seal, a vacuum is applied to the top of the suction seal, causing the suction cup to adhere to the airtight floor covering.
[0019] Preferably, the suction devices are actuated by pumps, in particular by hand-operated pumps.
[0020] Alternatively or additionally, the holder can be secured in the desired position by the user's weight. The arms, which extend radially from the sides of the holder without attached suction cups, can be used for this purpose. The user can stand on these arms, so that the cutting device is secured in the desired position by the user's own weight.
[0021] The arms on which the user can stand to fix himself in the desired position are preferably designed as footrests or function as such.
[0022] Preferably, the footrests are angled such that, after folding down from a folded-up transport position into a folded-down working position, they extend with a tread section of the footrests serving for the user's feet on the ground and parallel to the ground and are pivotally connected to the holder via a raised connecting section with a proximal inner end from the tread section resting on the ground.
[0023] In an alternative embodiment, the knife holder is not mounted and guided on the inside of the holder, which is referred to here as horizontal mounting. In a second embodiment, the mounting and guidance can be achieved via a holding section for holding the actuating element for the knife holder, which is designed as an actuating shaft. This actuating shaft can be rotated at an upper drive end by a user, preferably manually, but possibly also mechanically, and can be connected or is connected to the knife holder in a rotationally fixed manner at a lower connecting end and extends vertically to the holder plane defined by the holder. Because this holding section extends vertically to the holder, which then extends horizontally, during normal use on the floor, this mounting is referred to as vertical mounting, in contrast to the mounting of the first embodiment.
[0024] Particularly preferably, the holding section is attached to the top of the holder, preferably spanning a bridge, and comprises a shaft opening for supporting the actuating shaft centrally around the central longitudinal axis of the actuating shaft. This shaft opening preferably extends over a longer section to thus realize a particularly stable and precise longitudinal guidance of the actuating shaft in the shaft opening. For example, the shaft opening can extend over a length of 800 to 1500 mm, particularly preferably 1150 mm.
[0025] Bearings, particularly rotating linear bearings or ball bushings, are preferably arranged in the holding section around the shaft opening. Arranging two bearings one above the other has proven particularly advantageous for stability.
[0026] The holding section can be arranged in or received in two spaced-apart holding elements which extend between diametrically opposite ends of the holder and are fastened or fastenable thereto.
[0027] Particularly preferably, the holding elements are designed as holding plates which extend like a bridge over the holder and, between them and extending coaxially with the shaft opening to the axis of rotation of the cutting device, accommodate the holding section, which is preferably designed as a holding bush, for supporting the actuating shaft.
[0028] If the arms projecting from the holder comprise footrests, or if these arms are connected or connectable to the holding ring for the user to stand on, these arms are preferably connected or connectable to the lower end of the holder that can be placed on the ground, so that the user's weight is transferred particularly well to the holding ring. Furthermore, the arms, which preferably extend radially diametrically opposite, can comprise connected or connectable footrests on which the user can stand.
[0029] If the radially projecting arms of the fixing means are designed to be attached to these suction cups, these arms, which are then designed as suction cup arms, are preferably connected or connectable to the retaining ring at the height of the suction cups or at the upper end of the retaining ring, so that the suction cup can be connected to an air-impermeable floor covering or clamps for connection to an air-permeable floor covering with the arms, preferably in a detachable manner.
[0030] In the preferred embodiment, the arms with the footrests are pivotally connected between holding plates, so that the arms lie between the holding plates or are enclosed by them in the raised transport position and rest on the ground in the lowered working position.
[0031] A particularly compact and space-optimised design without arms provides for the fixing means to be integrated into the retaining ring. For this purpose, sealing lips can be provided directly on the underside of the retaining ring, e.g. embedded in it, which can be placed against the surface of the floor covering. By applying a negative pressure to the retaining ring, e.g. using a hand pump arranged in the retaining ring or also using a pneumatic negative pressure element, the negative pressure can then be applied to the suction cup in the retaining ring in order to fix it in the desired position. In this design, no radially projecting arms with suction cups are required, which is why this design is particularly suitable for use in narrow or confined spaces.
[0032] Different cutting circles with different radii can be realized by attaching knives to the knife holder, which can be spaced apart from a side wall of the knife holder via spacers in order to vary the radius as required.
[0033] The device according to the invention for particularly precise cutting of a section in a floor covering thus also enables better drying of damp floors or a new drying method for drying damp floors that have been or are exposed to water damage and require drying.
[0034] In such a case, drying is normally achieved using warm air by blowing or introducing the warm air into the lateral gap ("edge joint") between the screed lying on the floor and a wall enclosing the screed at the side. According to the invention, a core hole can now be drilled into the screed and the insulation down to the underlying screed. This core hole or hole can then be used to achieve particularly intensive drying of the floor, allowing drying to be completed much more quickly than using the edge joint alone. Subsequently, once drying is complete, the drilled-out core can be reinserted, the missing screed filled, and the floor covering, e.g., linoleum or another floor covering, can be glued down.
[0035] Because the cutout can be produced with particular precision using the device according to the invention, the cutout is almost invisible after gluing. In this respect, the invention enables and claims a novel drying method, which is characterized in that a core hole is drilled in the center of a floor and a drying device is connected to the hole thus created in the screed. The floor is thus dried via this hole with and without the edge joint.
[0036] When cutting linoleum, a joint of 2 - 5 mm wide, for example, can be cut using a double knife, thus creating a circular cutout between the cutout and the floor covering, which is filled with filler when reinserted in order to fix the cutout tightly against the surrounding floor covering and connect it to it.
[0037] With all embodiments, it is possible to realize the cutout as a ring element, which means that at least one first knife on the knife holder is arranged radially further inwards towards the axis of rotation than at least one second knife, which is then arranged radially further outwards compared to the - at least one - first knife.
[0038] To compensate for uneven ground and ensure a continuous cut, the blades of the blade holder can be spring-loaded or spring-loaded.
[0039] The particularly stable and dimensionally accurate embodiment of the cutting tool according to the invention comprises that all essential components, such as the retaining ring, the blade holder, and the arms for the suction cups ("suction cup arms"), are constructed from metal parts, in particular with a material thickness of 5 mm or more. An alternative embodiment provides for the design to be made from a fiber-reinforced plastic.
[0040] In the following detailed description of the figures, reference is made to the accompanying drawings, which form a part of this specification, and in which are shown to illustrate specific embodiments in which the invention may be practiced. In this regard, directional terminology such as "top," "bottom," "front," "back," "fore," "rear," etc., will be used with reference to the orientations of the described figure(s). Since components of embodiments can be positioned in a number of different orientations, the directional terminology is for purposes of illustration and is in no way limiting. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description is not to be taken in a limiting sense.
[0041] In this description, the terms "connected", "attached" and "integrated" are used to describe both a direct and an indirect connection, a direct or indirect connection and a direct or indirect integration.
[0042] Unless otherwise stated, the indefinite article and the definite article do not refer solely to a single component, but should be understood as "at least one." The terminology includes the aforementioned words, variations thereof, and similar meanings. Furthermore, it should be understood that the terms "about," "substantially," and similar terms in connection with the dimensions and a characteristic of a component of the invention do not describe the described dimension and characteristic as a strict limit or parameter and do not exclude minor variations thereof that are functionally similar. At a minimum, descriptions containing numerical parameters also include variations of these parameters according to mathematical and manufacturing principles in the prior art, e.g., rounding, deviations, and other systematic errors, manufacturing tolerances, etc.In the figures, identical or similar elements are provided with identical reference symbols where appropriate.
[0043] Reference symbol lines are lines that connect the reference symbol to the part in question. An arrow that doesn't touch any part, on the other hand, refers to the entire unit to which it is pointed.
[0044] The representations in the figures are not necessarily to scale. Certain areas may be exaggerated to illustrate details. Furthermore, the drawings may be simplistic and may not contain every detail that may be present in the actual design.
[0045] The cutting device according to the invention is described below by way of example with reference to the figures. All features of the respective exemplary embodiments are disclosed independently and independently of other features of the respective exemplary embodiment. Likewise, the features mentioned above and those further described can each be used individually or in any combination according to the invention. The embodiments shown and described are not to be understood as an exhaustive list, but rather are exemplary in nature for describing the invention.
[0046] They show: Fig. 1 is an isometric top view of a first embodiment of the cutting tool; Fig. 2 is an isometric side view of the first embodiment of the cutting tool from below; Fig. 3 is an enlarged view of the first embodiment of the cutting tool from below; Fig. 4 is an enlarged detailed view of the knife holder in the retaining ring of the first embodiment from below; Fig. 5 is an enlarged cross-section of an alternative embodiment of the cutting device; Fig. 6 is an isometric side view of a second embodiment of the cutting tool; Fig. 7 is a side view of the second embodiment of the cutting tool; Fig. 8 is a view of the second embodiment of the cutting tool from below; and Fig. 9 is a front view of the second embodiment of the cutting tool.
[0047] Figure 1shows an isometric top view of the cutting tool. This essentially comprises the centrally arranged retaining ring 2 and suction cups arranged laterally therefrom, namely a first suction cup 4 and a second suction cup 6.
[0048] Finally, an actuating element in the form of an actuating shaft 8 is provided to actuate the cutting tool and carry out the cutting process. The retaining ring 2 is designed as a metal, in particular steel, ring with a wall thickness of 30 mm in this case. Its underside forms a contact surface against the floor covering and its inner side defines a circular running surface for the knife holder 10, which is movable relative to the retaining ring 2, which remains stationary during actuation.
[0049] The knife holder 10, like the retaining ring 2, is made of metal, in particular steel, and has a square geometry. Ball bearings 12, 12', 12", 12‴; 13, 13', 13", 13"' are arranged at the corners of the knife holder 10, specifically on the top side of the knife holder 10 and on its bottom side, so that a total of eight ball bearings 12, 12', 12", 12‴; 13, 13', 13", 13‴ hold the knife holder 10 within the retaining ring 2 and thus realize particularly precise and dimensionally accurate guidance.
[0050] Extending transversely across the top of the retaining ring 2 is a cross member 14, which is releasably attached to the top of the retaining ring 2 with two screws 16, 16' and which has a pivot axis 18 in the center, which extends around the central pivot axis in the center of the retaining ring 2 and is connected in a rotationally fixed manner to the knife holder 10. The knife holder 2 is then actuated via the rod 8, which is displaceably arranged in a transverse hole within the pivot axis 18.
[0051] The knife holder can also be accommodated in the holder ring in a height-adjustable manner, so that the knife holder can be accommodated in the holder ring 2 for transport to protect the knives and to prevent injuries to the user, and can be lowered into the cross member 14 and placed on the ground for the cutting process.
[0052] Two suction arms 20, 20' can be provided, projecting diametrically laterally on the upper side of the retaining ring 2, to whose distal ends, i.e. directed away from the central axis of rotation, the suction cups 4, 6, which are otherwise known in their construction, are fastened, which serve as fixing means in this embodiment.
[0053] The fixed arrangement of the suction arms on the retaining ring increases the dimensional accuracy and stability of the cutting device.
[0054] In an alternative, more easily transportable embodiment, the suction arms 20, 20' can also be designed to be insertable into the retaining ring 2 and not, as in the present embodiment, be designed in one piece with the retaining ring 2.
[0055] In the preferred embodiment, the suction cups 4, 6 are designed as manually operated suction cups, which therefore each comprise a hand pump on the top side that can be operated via a button on the side, so that a negative pressure can be built up on the suction cup surface with the circumferential sealing rubber or on the contact surface of the suction cup on the lower contact surface of the suction cup, with which it can be fixed, for example, to a linoleum floor.
[0056] In an alternative, more easily transportable embodiment, the suction arms 20, 20' can also be designed to be insertable into the retaining ring 2 and not, as in the present embodiment, be designed in one piece with the retaining ring 2.
[0057] At the end of the suction arms 20, 20" there are trough-shaped receptacles into which the suction cups 4, 6 can be inserted and releasably fixed by means of a splint. In the present case, these are commercially available suction cups 4, 6, which are used, for example, for carrying glass panes.
[0058] Particularly good stability can be achieved by the design according to the invention, in which bearings 12, 12', 12", 12"'; 13, 13', 13", 13‴ are arranged at all corners of the knife holder 10, namely on the top and bottom of the knife holder 10, i.e., in two planes, in order to effectively prevent the knife holder from tilting in the retaining ring 2 and thus to achieve particularly precise running and thus cutting. These bearings, which can be designed as roller bearings or plain bearings and are arranged on two vertical planes between the knife holder 10 and the retaining ring 2, ensure particularly good tilt stability of the movable knife holder 10 in relation to the stationary retaining ring 2.
[0059] In the preferred embodiment, the suction cups 4, 6 are designed as manually operated suction cups, which therefore each comprise a hand pump on the top side that can be operated via a button on the side, so that a negative pressure can be built up on the suction cup surface with the circumferential sealing rubber or on the contact surface of the suction cup on the lower contact surface of the suction cup, with which it can be fixed, for example, to a linoleum floor.
[0060] At the end of the suction arms 20, 20", trough-shaped receptacles can preferably be formed, into which the suction cups 4, 6 can be inserted and releasably fixed by means of a splint. In the present case, these are commercially available suction cups 4, 6, which are used, for example, for carrying glass panes.
[0061] Particularly good stability can be achieved by the design according to the invention, in which bearings 12, 12', 12", 12"; 13, 13', 13", 13‴ are arranged at all corners of the knife holder 10, namely on the top and bottom of the knife holder 10, in order to effectively prevent the knife holder from tilting in the holding ring 2 and thus to achieve particularly precise running and thus cutting. These bearings arranged on two vertical planes between the knife holder 10 and the holding ring 2 are particularly well suited to Figure 4 which shows an enlarged detailed view of the upper section of the knife holder 10 and the retaining ring 2.
[0062] The view of the cutting device from below in Figure 3shows the knives 22, 22', 22", 22‴ attached to the side of the knife holder 10, which in this case are screwed to each side of the knife holder 10 at an angle of inclination of 30 to 45 degrees. To change the cutting radius, spacer elements of different widths can be arranged between the knife holder 10 and the knives 22, 22`, 22", 22‴, which are preferably releasably fixed to an external holder using screws.
[0063] In an alternative, more easily transportable embodiment, the suction arms 20, 20' can also be designed to be insertable into the retaining ring 2 and not, as in the present embodiment, to be designed as one piece with the retaining ring 2.
[0064] Figure 5shows an enlarged cross section through an alternatively designed retaining ring 2', which comprises sealing lips 26, 26' fastened to the underside as a fixing means, inserted here into corresponding grooves and extending all the way around, with which the retaining ring 2' can be placed on a base and, by applying a negative pressure, can be applied to the annular space formed between the retaining ring 2' and the sealing lips 26, 26' and the base, in order to fix the retaining ring to the base in the desired position with precise positioning, in order to then carry out the cut.
[0065] In the Figures 6 to 9 In the second embodiment shown, the cutting device again comprises an outer, stationary holding ring 36, which can be positioned or applied in the desired position on the floor covering, as well as the knife holder 34 in order to create the cutout in the floor covering.
[0066] In contrast to the Figures 1 to 4Unlike the first embodiment shown, in this second embodiment, the mounting is vertical, meaning that the rotatable actuating shaft 28 is mounted within a holding element encompassing the shaft opening. The holding element is designed here as a holding block 30 and comprises a vertically extending shaft opening with bearings inserted therein, which accommodate the rotatable actuating shaft 28 in the installed position. This "vertical mounting" thus realized also realizes a precise mounting of the relatively movable knife holder 34 in relation to the stationary retaining ring 36.
[0067] The actuating shaft 28 has an octagonal section at its upper end, which allows it to be actuated via a detachably attachable actuating element. This actuating element can be designed, for example, as a ratchet or a crossbar.
[0068] In this embodiment, the knife holder 24 is cross-shaped with four arms. Four knives 34a, 34b, 34c, 34d are attached to the radially outer ends of the arms. In this embodiment, too, the knives 34a, 34b, 34c, 34d can be configured by inserting spacers to either all make a cut within the same radius or with two radii, namely a smaller inner radius and a slightly larger outer radius, so that a circular ring can be cut out.
[0069] The holding block 30 is held on the holding ring 36 via holding plates 38a, 38b, which hold the holding block 30 between them and sit on a vertical web of the holding ring with a correspondingly formed shoulder, are screwed to this and thus extend from one end of the holding ring 36 to the diametrically opposite end of the holding ring 36 like a bridge.
[0070] In this embodiment, the fixing means of the cutting device between the holding plates comprise pivotally hinged arms 40a, 40b, which can be transferred from a folded-up transport position (not shown), in which the arms 40a, 40b are arranged between the holding plates 38a, 38b, into a folded-down working position shown in the figures, in which the user can stand on these arms 40a, 40b on defined foot surfaces in order to position the cutting device in the desired position.
[0071] To improve the fixation of the arms 40a, 40b in relation to the substrate, friction-increasing elements can be arranged between the contact surfaces of the arms 40a, 40b and the substrate, in particular silicone inserts 40d embedded in the arms. List of reference symbols
[0072] 2Retaining ring 4, 6Suction cup 8Actuating shaft (rod) 10Blade holder 12, 12', 12", 12‴Ball bearing 13, 13', 13", 13‴Ball bearing 14Cross member 16, 16'Screw 18Rotary axis 20, 20'Suction arm 22, 22', 22", 22‴Blade 24Spacer 26, 26'Sealing lip 28Actuating shaft 30Retaining block 34Blade holder 34a, 34b, 34c, 34dBlade 36Retaining ring 40a, 40bArm 40dSilicone insert
Claims
1. Cutting tool for cutting out a section of a floor covering lying on a substrate, e.g. a carpet, vinyl or the like, with a holder which can be placed on the floor covering and which defines an inner side of the holder, a blade holder (10) which can be inserted into the holder and is movable relative to the inner side of the holder and which is movable relative to the stationary holder via an actuating element to carry out a cutting movement, wherein one or more blades (22, 22', 22", 22‴) can be or are fastened to the blade holder (10) in such a way that they cut into the floor covering when the cutting movement is carried out in order to cut out the section from the floor covering, CHARACTERIZED BY THAT Fixing means are provided to fix the holder in a desired position on the surface, and THATBearings are arranged between the stationary holder and the knife holder bearing (12, 12', 12", 12‴; 13, 13', 13", 13‴) which is relatively movable thereto, or the bearings are provided in a holding section for rotatably receiving the actuating element.
2. Cutting tool according to claim 1, CHARACTERIZED BY the fact that the holding section is connectable or connected to the holder and has a shaft opening for rotatably receiving an actuating element designed as a drive shaft.
3. Cutting tool according to claim 2, CHARACTERIZED BY the fact that the holding section spans the holder like a bridge.
4. Cutting tool according to one of the preceding claims, CHARACTERIZED BY the fact that the bearings are formed at corners or edges of the knife holder (2).
5. Cutting tool according to one of the preceding claims, CHARACTERIZED BY the fact that the holder is designed as a closed retaining ring (2). 6.Cutting tool according to one of the preceding claims 5, CHARACTERIZED BY the fact that the bearings (12, 12', 12", 12‴; 13, 13', 13", 13‴) are arranged at corners of the knife holder (2).
7. Cutting tool according to one of the preceding claims, CHARACTERIZED BY the fact that the fixing means comprise at least one arm, preferably two arms pivotably connectable or connected to the holder.
8. Cutting tool according to one of the preceding claims, CHARACTERIZED BY the fact that the fixing means comprise at least one, preferably two suction cups (4, 6).
9. Cutting tool according to claim 7 or 9, CHARACTERIZED BY the fact that the at least one suction cup (4, 6) is connectable or connected to the arms.
11. Cutting tool according to claim 8, CHARACTERIZED BY the fact thaton a retaining ring underside of the retaining ring (2), which in use rests on the floor covering when carrying out the cutting process, sealing lips are provided which can be placed against the floor covering and that the retaining ring (2) is designed to apply a negative pressure in a space formed by the retaining ring underside, the sealing lips and the floor covering.
12. Cutting tool according to one of the preceding claims, CHARACTERIZED BY the fact that at least one, preferably two, particularly preferably two opposing knives (22, 22', 22", 22‴) can be releasably fastened to the side of the knife holder (10).
13. Cutting tool according to claim 12, CHARACTERIZED BY the fact that a spacer (24) of different sizes can be inserted or is inserted between the knife holder (10) and the at least one knife (22, 22', 22", 22‴).
14. Cutting tool according to one of claims 7 to 13, CHARACTERIZED BY the fact thatthe arms are designed as footrests for a user.
Citation Information
Patent Citations
Device for cutting open parcels, in particular cardboard parcels, and kit comprising the opening device
WO2020254474A1
Circular blank cutter unit - has centering shaft with contact end rotatable in casing and cutting blade on adjustable arm
DE2910642A1
Circle cutter employing base, swivel handle, and pivot bar with adjustable knife
US4858322A
Material circle cutter
US5860217A