WO2023274571A1 - Langlebige glättekelle - Google Patents
Langlebige glättekelle Download PDFInfo
- Publication number
- WO2023274571A1 WO2023274571A1 PCT/EP2022/000058 EP2022000058W WO2023274571A1 WO 2023274571 A1 WO2023274571 A1 WO 2023274571A1 EP 2022000058 W EP2022000058 W EP 2022000058W WO 2023274571 A1 WO2023274571 A1 WO 2023274571A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- smoothing
- trowel
- bolts
- handle
- blade
- Prior art date
Links
- 238000009499 grossing Methods 0.000 title claims abstract description 84
- 238000003466 welding Methods 0.000 claims description 46
- 238000000034 method Methods 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 abstract description 4
- 239000011505 plaster Substances 0.000 abstract description 4
- 239000004566 building material Substances 0.000 abstract description 3
- 239000000945 filler Substances 0.000 description 6
- 238000003825 pressing Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000007799 cork Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F21/00—Implements for finishing work on buildings
- E04F21/02—Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
- E04F21/16—Implements for after-treatment of plaster or the like before it has hardened or dried, e.g. smoothing-tools, profile trowels
- E04F21/161—Trowels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25G—HANDLES FOR HAND IMPLEMENTS
- B25G3/00—Attaching handles to the implements
- B25G3/34—Attaching handles to the implements by pressing the handle on the implements; using cement or molten metal, e.g. casting, moulding, by welding or the like
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
- E04G21/20—Tools or apparatus for applying mortar
- E04G21/201—Trowels
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F21/00—Implements for finishing work on buildings
- E04F21/20—Implements for finishing work on buildings for laying flooring
- E04F21/24—Implements for finishing work on buildings for laying flooring of masses made in situ, e.g. smoothing tools
- E04F21/241—Elongated smoothing blades or plates, e.g. screed apparatus
Definitions
- the present invention relates to a tool that can be used for spreading and smoothing building materials, especially plaster and mortar. It is typically used for plastering.
- the tool is generally referred to herein as a smoothing trowel.
- the invention relates equally to spatulas, in particular surface spatulas, painters' spatulas and plaster spatulas, as well as squeegees in individual cases.
- the invention also relates to corner trowels, inside corner trowels such as outside corner trowels, mortar trowels and pointed trowels, each in toothed and non-toothed versions.
- the utility model DE 1 754 183 discloses a smoothing trowel, the main elements of which are the trowel blade, a handle support and the handle.
- the grip support attaches to a bar that stabilizes the trowel blade.
- it can be advantageous to manufacture all three parts in one piece from plastic. This also obviates the difficulty of a reliable connection, as the mechanical stress of the trowels and contact with grout can weaken connections over time.
- Offenlegungsschrift 1 684 410 discloses a mason's trowel with a soldered connection between the trowel blade and the handle support. The soldered connection is said to lead to improved strength in the connection between the handle and the trowel blade.
- the solder is introduced into holes in the sole plate of the handle, which are additionally provided with extensions at the end facing the trowel blade.
- the solution may have proven itself for different blades. But it seems desirable, at least to to have more freedom in the design and choice of material for the handle support and trowel blade, to also be able to offer alternatives to the solder connection.
- the published application 25 40 885 discloses a smoothing trowel or a "smoothing chip" for plastering with a sliding and replaceable handle.
- a guide rail is provided on the smoothing blade, to which the handle is attached.
- the guide rail is attached to the steel finishing blade by welding.
- Patent specification DE 3639978 discloses a bricklayer's trowel in which the handle is arranged behind the trowel blade and is connected to the trowel blade with a curved piece of pipe, the so-called tang.
- the fastening between tang and trowel blade should be done by welding. This construction may produce a very strong joint, but is poorly suited to other trowel shapes, such as those where the handle is over the center of the blade.
- the invention seeks to circumvent the disadvantages of the prior art.
- a long-lasting and robust smoothing trowel is to be made available. This should also be able to be produced efficiently.
- smoothing trowel is also to be understood as a term for designating related tools that are used to distribute building material, in particular those that are named as examples with typical designations at the beginning.
- a smoothing trowel comprises at least one smoothing blade and a handle.
- the smoothing blade is usually a completely or mostly flat surface, so that it can be used over the entire surface for smoothing on one level. Exceptions are corner trowels for inner or outer corners/edges, where the smoothing blade is curved so that the two main work surfaces are at a 90° angle to each other.
- a handle holder is intended to connect the handle to the trowel blade.
- the handle holder can be a separate component, alternatively it could be made in one piece with the handle or with the smoothing blade.
- the handle holder can conveniently be made of a metal, for example steel, stainless steel or aluminium. It is particularly useful here to manufacture the handle holder as a cast component, preferably as an aluminum die-cast component.
- the handle holder could also be made of plastic, certainly also in the injection molding process.
- the handle holder is said to be connected to the trowel blade with a plurality of bolts.
- a large number is to be understood here as at least one bolt, as a rule at least two bolts, frequently between 4 and 10 bolts, are used.
- the bolts are advantageously made of metal, for example steel, stainless steel or aluminum. A good weldable metal is an advantage. It is also possible to weld the bolts to the handle holder. It can also be advantageous for the bolts to be screwed. It can be useful to select the bolt material in such a way that a press connection can be achieved.
- Trowels are available where the first and last bolts of a connecting row of bolts are thicker than the remaining bolts. Since the first and last bolts are more heavily loaded than the other bolts, this can offer advantages. However, the present invention allows a secure and permanent connection without having to choose a thicker first and last bolt.
- recesses should be provided in the smoothing blade. These recesses can be round holes, for example.
- the bolts are inserted into these recesses.
- the bolts should not sit on the smoothing blade, but they are at least partially passed through the smoothing blade.
- This type of connection geometry results in a stronger and more permanent connection than the usual connections with bolts.
- a smoothing trowel is often used for several years, sometimes for more than a decade. It is exposed to high mechanical stresses, in particular because at least the smoothing blade typically has a certain elasticity. It is also exposed to chemical stresses, especially when in contact with alkaline mortar or plaster.
- the bolts are welded to the trowel. This should be at least some of the large number of bolts used, preferably all of them. It has proven to be particularly advantageous to provide these welded connections on the working side of the trowel and/or in the area of the recesses (ie between the working side and the opposite upper side of the trowel). It may be correct to provide welds on the working side of the screed blade or to provide welds in the area of the recesses or to provide welds on the working side of the screed blade and in the area of the recesses. Individual or all welded joints can be positioned in this way. There are certain challenges with this approach as it is only then that the smoothness of the sheet has to be restored. At the same time, however, it has been shown that such a connection is particularly strong and durable, as well as favorable in terms of the manufacturing process.
- Laser welding also referred to as laser beam welding, is particularly suitable for connecting the bolts to the smoothing plate. It can be used as heat conduction welding or deep penetration welding. In individual cases, it can be combined with other welding, joining or connection techniques.
- the connection is preferably made solely by laser welding. Preferably no filler metal is used.
- Chrome-molybdenum steel is also used here as a generic term for alloys that contain other (smaller) parts. It is particularly advantageous if nickel is contained in the alloy.
- the grip holder has a grip shoe, a grip shaft and a grip core. These can each be designed as separate components or the handle holder can be in one piece.
- the connection to the smoothing blade is made via the grip shoe.
- the grip shoe can be cuboid, for example, and on its grip shaft Facing away from the underside have a flat surface for contact and connection with the screed.
- the grip shaft serves as a connection between the grip shoe and the grip core. It runs essentially perpendicularly to the contact surface of the grip shoe, ie in the mounted state essentially perpendicularly to the smoothing blade.
- the grip core typically runs substantially parallel to the screed blade.
- the handle core is surrounded by a handle.
- the handle can be ergonomically designed. It is often made of plastic, but can also be made of cork, for example.
- the handle can be made in one piece with the handle core, but it is advantageous if the handle is removable and possibly also replaceable. The handle can then be attached to the handle core and connected to it, for example, wedged or glued or screwed.
- the bolts are connected to the handle holder by pressing.
- the bolts if the handle holder has a grip shoe, are inserted into recesses in the grip shoe.
- the bolts are then compressed under high pressure so that they completely fill the recesses, usually round holes, in the grip shoe.
- a bolt cap can also be created, which protrudes beyond the holes in the grip shoe and has a thickening at the top, whereby an additional (positive) connection with the grip shoe is achieved.
- the invention also relates to a method for producing a smoothing trowel, which comprises the following steps: a. Providing a smoothing sheet with a top and a working side b. providing a handle holder c. Providing bolts d. creating at least one hole in the glazing sheet e. Inserting the stud into the hole f. Welding the stud from the working side
- a hole can be produced in the smoothing blade by a machining process, in particular by drilling.
- the hole can also be created by punching.
- An equal plurality of holes (or general recesses) is to be provided for the plurality of bolts. It is advantageous if these are generated in a single work step.
- the bracket can stabilize the stud in the proper position for welding. After welding, the bracket can be removed. There are a variety of tools that can be used to hold it.
- a mechanical holder can also be provided as a support, which temporarily supports the bolts in an appropriate manner, for example by supporting them from the top of the screed blade. (The top is the opposite side from the work side.)
- the handle holder itself can serve as a support in this step of the process.
- first direction feed direction
- second direction welding approach direction
- first direction can lie in a first right circular cone and the second direction (direction of approach of the welding machine) can lie in a second right circular cone and both circular cones are arranged opposite one another around a central axis, so that they form a double cone form.
- Both circular cones can have a central angle of 90° or less.
- the bolts protrude a certain distance beyond the trowel.
- this distance is usually much less than the bolt length. Therefore, when a plurality of studs are used, particularly more than four studs, and the studs are spaced closer than 5 cm apart, particularly closer than 3 cm or 2 cm, welding studs from the working side is easier. On the top of the trowel, the protruding studs would interfere with the free approach and movement of a welder or torch.
- the handle holder is first fitted with bolts and the bolts are then made available together with the handle holder. In a subsequent process step, the handle holder would then have to be taken to the welding site together with the bolts.
- the welding process itself can be carried out more quickly by preparing the handle holder accordingly. This is particularly advantageous when the welding devices used are expensive and insofar as a high throughput at the welding station is advantageous.
- the bolts are welded by laser welding. It is advantageous if the bolts used protrude beyond the working side of the trowel and bolt material is removed there during the welding process. It is particularly advantageous if the bolt material is placed in the gap between the bolt and the hole.
- Material can be melted for this purpose. All or part of the material protruding from the work side can be offset. In this way, the hole, which must be at least minimally larger than the bolt circumference, is completely or partially closed. The movement of material can be facilitated by the action of gravity if the bolts are oriented appropriately. It is therefore useful if the bolt ends point upwards.
- the closure could be effected by a welding filler, for example a welding wire, but within the scope of the present invention welding without welding filler is preferred.
- the welding process without welding filler is even more economical and faster to carry out.
- a bolt protrusion is not advantageous per se and in this respect this process concept is not intuitive. Nevertheless, within the scope of the present invention, it has proven to be advantageous to accept the occurrence of a bolt protrusion in the corresponding method step.
- a method is also advantageous in which at least two or all of the holes to be provided in the smoothing blade are produced in one work step.
- FIG. 1 shows a perspective view of a smoothing trowel according to the invention which is ready for use.
- FIG. 2 shows, in the same perspective view, a smoothing trowel according to the invention with the handle removed.
- FIG. 3 shows a cross-sectional view of a bolt being received by the smoothing blade.
- FIG. 4 shows a portion of the finishing trowel according to the invention in an enlarged perspective view.
- FIG. 1 shows a perspective view of a smoothing trowel according to the invention.
- the smoothing trowel 10 has a smoothing blade 20 which is guided with the handle 30 .
- the handle holder 40 is used to connect the handle 30 and the smoothing blade 20 .
- the handle holder 40 is connected to the smoothing blade 20 by a large number of bolts 50 .
- FIG. 2 shows a smoothing trowel 10 according to the invention in the same perspective view, but in which the handle 30 has been removed. As a result, the design of the handle holder 40 can be seen more clearly.
- the grip holder 40 includes the grip shoe 42. The grip shoe lies directly on top of the smoothing blade 20.
- the grip shoe 42 is connected to a grip shaft 44 that projects from the grip shoe 42 .
- the handle shaft 44 connects to the handle core 46 .
- the handle core 46 is suitably a rod or tube section. It has substantially the length of the handle 30.
- the handle core 46 can have a profile, for example a square or rectangular profile, which prevents twisting of the handle about the longitudinal axis of the handle core 46. A square profile is shown here.
- a thread can also be provided at the end of the handle core, for example, via which the handle 30 can be secured with a nut in order to prevent it from slipping off the handle core 46 .
- FIG. 3 shows a schematic representation of the connection of a bolt 50 to the smoothing blade 20.
- the bolt has a lower end 52, a bolt shank 54 and the bolt head 56.
- the smoothing blade 20 has a recess 60 for the bolt.
- this recess is expediently provided as a round hole.
- the recess can be produced by drilling or punching.
- the lower pin end 52 is pushed all the way through the recess 60 from the top of the screed blade 20 . Therefore, the lower pin end 52 of the pin 50 then protrudes and protrudes beyond the working surface 70 of the finishing blade 20.
- This positioning of the bolt differs greatly from known connection types. It is typical for the welding that the bolt is placed on top of the smoothing blade 20 . In this variant, therefore, no recess is to be provided at all. In principle, a form-fitting connection would also be conceivable.
- the lower bolt end 52 could have a thickening and a region of the recess could have a corresponding widening.
- this approach has been studied in more detail and has proven to be disadvantageous, especially in terms of its longevity.
- the bolt 50 is passed through the recess 60 in the finishing blade to provide a welded joint.
- a weld connection can be provided in the first weld region 62 .
- This welding area lies in the gap between the walls of the recess 60 and the outer circumference of the bolt 50, completely or essentially between the upper side and the working side of the smoothing blade 20.
- Welding can also be carried out there with a welding additive if necessary.
- welding can take place in the second welding area 64 . This welding area is in the exit area of the stud. Welding is therefore carried out directly on the working side 70 of the smoothing trowel 20.
- a weld seam typically runs along a ring the edge of the recess and thus at the same time ring-shaped around the bolt.
- a round hole results in a round ring.
- a connection to the handle holder 40 is established with the area of the bolt protruding on the upper side of the smoothing trowel 20 , essentially with the bolt shank 54 .
- the bolt shank 54 is guided into corresponding holes or recesses in the grip holder, typically the grip shoe 42 .
- the connection can be made by screwing. A thread would then have to be provided on the bolt shank 54 .
- the connection can also be made by pressing. In the process, so much pressure is exerted on the bolt from the direction of the bolt head 56 that it fills a correspondingly dimensioned recess in the handle holder.
- a softer bolt material, for example aluminium, should be used for the purpose of pressing.
- FIG. 4 shows an enlarged section of how the connection between the smoothing blade 20 and the handle holder 40 can be established.
- a plurality of bolts 60 are connected to the screed blade 20 as shown. A number of two to twelve bolts is generally expedient within the scope of the present invention.
- the bolts are connected to the screed blade 20 at regular or variable intervals.
- the bolts are then inserted into appropriate recesses in the handle bracket 40, preferably in the handle shoe 42. Shown are bolts which were pressed. Accordingly, it is not necessary to bolt 60 on top to provide nuts. It is expedient if the upper side 48 of the grip shoe 42 is ground down after pressing. Then, as shown, the bolts 60 end flush with the upper side 48 of the grip shoe 42.
- handle 40 handle holder 42 handle shoe 44 handle shaft 46 handle core
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA3225318A CA3225318A1 (en) | 2021-06-23 | 2022-06-23 | Durable smoothing trowel |
EP22786286.9A EP4359623A1 (de) | 2021-06-23 | 2022-06-23 | Langlebige glättekelle |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP21000163.2A EP4108852A1 (de) | 2021-06-23 | 2021-06-23 | Langlebige glättekelle |
EP21000163.2 | 2021-06-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023274571A1 true WO2023274571A1 (de) | 2023-01-05 |
Family
ID=76971597
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2022/000058 WO2023274571A1 (de) | 2021-06-23 | 2022-06-23 | Langlebige glättekelle |
Country Status (3)
Country | Link |
---|---|
EP (2) | EP4108852A1 (de) |
CA (1) | CA3225318A1 (de) |
WO (1) | WO2023274571A1 (de) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1754183U (de) * | 1957-08-21 | 1957-10-17 | Hallenscheid Geb | Glaettekelle. |
DE1684410A1 (de) * | 1966-12-19 | 1969-10-30 | Wilhelm Rentrop | Maurerkelle mit einer Loetverbindung zwischen Kellenblatt und Handgriffstuetze |
FR2281195A1 (fr) * | 1974-08-07 | 1976-03-05 | Beraud Ets M | Procede d'emmanchement des poignees de prehension des truelles, platroirs ou autres outils |
DE2540885A1 (de) * | 1975-09-13 | 1977-03-24 | Guenter Gudd | Glaettspahn zum verputzen verschiebbar und mit auswechselbarem griff |
DE3639978A1 (de) * | 1986-11-22 | 1988-06-01 | Happe Herbert Fa | Kelle, insbesondere zum mauern, fugen oder dergleichen |
US20050217050A1 (en) * | 2004-04-01 | 2005-10-06 | Meyers Lawrence G | Trowel blade |
DE102014002951A1 (de) * | 2014-03-06 | 2015-09-10 | Nela Gmbh | Vorrichtung zum Glätten |
US9784000B1 (en) * | 2007-09-19 | 2017-10-10 | Exceptional Ip Holdings, Llc | Apparatus and methods for ergonomic building tools |
-
2021
- 2021-06-23 EP EP21000163.2A patent/EP4108852A1/de not_active Ceased
-
2022
- 2022-06-23 WO PCT/EP2022/000058 patent/WO2023274571A1/de active Application Filing
- 2022-06-23 CA CA3225318A patent/CA3225318A1/en active Pending
- 2022-06-23 EP EP22786286.9A patent/EP4359623A1/de active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1754183U (de) * | 1957-08-21 | 1957-10-17 | Hallenscheid Geb | Glaettekelle. |
DE1684410A1 (de) * | 1966-12-19 | 1969-10-30 | Wilhelm Rentrop | Maurerkelle mit einer Loetverbindung zwischen Kellenblatt und Handgriffstuetze |
FR2281195A1 (fr) * | 1974-08-07 | 1976-03-05 | Beraud Ets M | Procede d'emmanchement des poignees de prehension des truelles, platroirs ou autres outils |
DE2540885A1 (de) * | 1975-09-13 | 1977-03-24 | Guenter Gudd | Glaettspahn zum verputzen verschiebbar und mit auswechselbarem griff |
DE3639978A1 (de) * | 1986-11-22 | 1988-06-01 | Happe Herbert Fa | Kelle, insbesondere zum mauern, fugen oder dergleichen |
US20050217050A1 (en) * | 2004-04-01 | 2005-10-06 | Meyers Lawrence G | Trowel blade |
US9784000B1 (en) * | 2007-09-19 | 2017-10-10 | Exceptional Ip Holdings, Llc | Apparatus and methods for ergonomic building tools |
DE102014002951A1 (de) * | 2014-03-06 | 2015-09-10 | Nela Gmbh | Vorrichtung zum Glätten |
Also Published As
Publication number | Publication date |
---|---|
EP4359623A1 (de) | 2024-05-01 |
CA3225318A1 (en) | 2023-01-05 |
EP4108852A1 (de) | 2022-12-28 |
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