NO347474B1 - Paintbrush with removably connected brush-head - Google Patents

Description

Field of the invention:

The present invention relates to brushes and has particular application to paint brushes.

Background art:

Paintbrushes for the application of coating, paint and varnish are commonly known objects. They generally include a handle member interconnected to a bristle-carrying head, upon which are arranged a plurality of bristles. A junction between the handle member and the bristle carrying head is commonly further secured and covered by a collar, wherein the collar is fitted around the base of the bristle-carrying head and part of the handle member by such means as adhesives and/or screws to fix brush-head and handle together in a permanent assembled state. The present invention relates to paintbrushes comprising substantially standard paintbrush elements (brush head, ferrule and handle). As opposed to “permanently assembled” paintbrushes, the present invention deals specifically with paintbrushes of replaceable or interchangeable brush-heads and the significant challenges in obtaining well functioning removable connection between brush-head and handle of such. Relatively low precision in manufacturing of components makes it very challenging to obtain a uniform fit and removable connection between substantially standard paintbrush components (e.g. brush-head and corresponding handle) that is both sufficiently tight and sufficiently loose to provide good and consistent user functionality in the end product.

Through inclusion of certain new and innovative low-complexity features, the present invention solves issues of connection between brush-head and handle not sufficiently solved in known prior art. Some relevant background art includes:

US2006000042A: The basic concept of a brush-head removably connected to a handle is known through this document. It describes a corner brush comprising a handle and a brush-head, the handle adapted in shape to fit with the angled brush-head to form a removable connection between the two. The document further describes a “click lock-in mechanism” between an aperture in the brush-head and a corresponding protrusion in the handle to prevent the brush-head from sliding out of its connection with the handle. Aspects of precision, tolerances and fit between handle and brush-head are not addressed, nor the expected implications of such on functionality of the end-product (e.g. “slack” in the connection).

WO2019083425A describes a relatively complex design, where a moulded plastic “bristle head cassette” of intricate details can be removably connected to a handle. In addition to basic principles of connection between brush-head and handle (i.e.

“corresponding shape”) as also known from prior art US2006000042A, the document provides different concrete technical solutions of “Snap-fit locking” through the inclusion of ridges, grooves, protruding edges (84) or “other suitable connection means (26)” in the connector/ferrule and in the handle, together forming “snap-in area(s)”(85) capable of receiving the cassette collar (20) to lock this into position. The document further describes a foam or rubber insert (50) configured for insertion into the cassette collar (20), through a pattern of ribs in the cassette collar, to provide a permanent cavity within “the plurality of bristles” capable of holding an amount of paint to increase paint capacity of the brush and support even distribution of paint onto a surface. Such permanent insert is a typical feature on most conventional brush-heads, although the insert is typically made from wood instead of rubber/foam. The insert described in the document plays no role in the connection mechanism between handle and brush-head, nor does the document indicate any intention of repeat connection/disconnection between insert and cassette.

US20200170396A1 describes a paintbrush comprising a conventional handle in combination with an unconventional “brush-head” referred to in the document as the “body”. Said body being made from two elements: a flat fabric folded and joined along its edges to form an empty “pocket” displaying one opening, said pocked having a hard interior surface and a soft velutinous exterior surface, the latter surface being capable of distributing paint onto a surface. The second element of the “body” constitute a semi-rigid insert (e.g. a block of foam material) adapted in shape to be inserted into and fill said empty pocket, supposedly so to provide support to the otherwise empty pocket. Friction is further mentioned as one mean of keeping the insert in place within the pocket. It is further described how the handle with the addition of a ferrule is positioned coaxially with the complete “body” and joined to this to seal the semi-rigid insert into the body safely keeping the insert in place within the body. The semi-rigid insert plays no direct role in the connection mechanism between body (brush head) and handle. The invention indicates no intention of a removable connection between body and handle of the paintbrush, and no intention of the body (brush-head) being removable/replaceable. Permanent means of fixture between elements, such as adhesives, nails and tape, are however specified throughout the document.

US3386119 describes paintbrush comprising a handle and a conventional brush head (bristles bundled together by a ferrule), and an alternative mean of fixing these permanently to one another by the use of a special expanding foam resin. The main objective of the invention is to provide a paintbrush that in its ready assembled state is free from empty space within the ferrule, to prevent solvents, water and other liquids to seep into the seams and openings in the ferrule to accumulate therein over time. Said objective is addressed by using a special type of expanding foam resin that in addition to permanently bonding handle to brush-head also expands to fill in any empty space in the ferrule, eventually hardening to a rigid closed cell foam material. The expanding property as well as rigidity and light weight of the particular type of resin/foam (“rigid closed cell formulation”) seems to be a main feature of the invention. Prior to curing it is resinous, but during expansion and curing the foamed material hardens to a degree where it firmly anchors handle to brush-head.

WO2009125022A – fig.3 / fig.5 /fig.6 / fig.7/ fig.8 and fig.17 – In the field of electronics, the document describes an electric vibrating paint brush with replaceable brush heads, including connection mechanism making use of the principle of morse cones (ref. 54, 64 in said document). Although the intended function of the morse cones as disclosed in the document is widely different from the rib/groove feature as described in the present invention (ref. 25, 24 in present pat. appl.), said “morse cone feature” may, in terms of appearance (shape/fit), represent some similarity with the rib/groove feature as disclosed in the present invention.

Objectives of the Invention:

Given proper cleaning after use, paintbrushes can be used numerous times. But after time the bristles will wear down to an extent that they will not function optimally. The paintbrush, comprising both handle and head, will then be discarded and replaced by a new paintbrush. Whereas a brush-head has a very limited life span due to deteriorating functionality of the bristles, a handle member is much less affected by wear thus potentially having a substantially longer life span than the brush-head. The handle member of the paintbrush represents a substantial amount of raw material as well as energy used in its production, and despite its potentially long life span it ends up being discarded as soon as its attached brush-head is worn down. This leads to the loss of valuable resources that could have been exploited to a much greater extent. A paintbrush with a replaceable brushhead, i.e. a removable connection between brush-head and handle, addresses this issue in allowing the user to discard a worn down brush-head while keeping the handle for further use with a new brush-head. It also allows for swift changing of brush-heads when switching between different colour paints using the one and same handle. Selling handle and brushhead as separate parts will optimize the life span of each, and at the same time provide a lower cost solution to users by enabling purchase of only the single part they need instead of having to buy both parts combined.

The present invention provides a well functioning paintbrush, comprising a brushhead removably connected to a handle to allow for easy repeat connection and disconnection of the brush-head from the handle without the need for tools or modification of any of the two said parts. It is critical that the connection and disconnection between the two is very swift and easy in order to provide acceptable user functionality, yet at the same time the connection must feel sturdy and safe. Imperfections in manufacturing as well as tolerances makes consistent and sufficiently tight fit a main challenge sought solved by the present invention through careful inclusion of soft friction enhancing cushioning material in the connection between handle and brush-head providing a low-tech and low-complexity solution to said challenge. The level of precision required for acceptable functionality is particularly difficult to achieve in handles machined from hard materials such as wood.

The unique and very specific properties of soft cushioning material (such as certain types of foam, felt and similar) do address some specific and challenging technical issues related to paintbrush manufacturing today, as does it solve critical requirements in terms of user experience necessary to meet in order to achieve a commercially successful endproduct.

Taking into account limitations in commercial paintbrush manufacturing today it is claimed that the present invention, through innovative use of soft cushioning material, addresses significant issues not sufficiently solved in current prior art.

The vast majority of paintbrushes in the market today comprise a metal ferrule fixed to a handle of either rigid plastic or wood. Although relatively tight production tolerances are achievable in plastic moulding, the precision in conventional high-speed production of brush heads (metal ferrule wrapping, bristle insertion and epoxy casting) is at a completely different level with substantially looser production tolerances. Current state of production technology makes it thus unrealistic to mass produce parts (standard design brush-head and handle) with a sufficiently tight and uniform fit to provide a sturdy and well functioning end product without the use of permanent means of fixture between brush head and handle, such as spikes, adhesives or clamping. In case of wooden handle paintbrushes, both loose production tolerances as well as the dimensional instability of wood – expansion and contraction due to ambient conditions of moisture and temperature - adds further to this problem. As a consequence of these tolerance issues, a batch of mass produced brush heads and a batch of mass produced handles to fit, will provide both paintbrushes of relatively tight fit (e.g. the largest handle paired with the smallest brush head) and also paintbrushes of a very loose fit (e.g. the smallest handle paired with the largest brushhead). This, of course, is a significant issue in terms of the commercial value of the endproduct: “refill brush-heads” removably connected to handle. This span in size variations due to production tolerances cannot be fully “absorbed” by any conventional material used in standard paintbrushes today – even “soft” polymers commonly used in plastic handle moulding do not provide a sufficiently high degree of flexibility (repeat compression/expansion) to work well across the relevant range of size variations. In terms of user functionality, even a slightly loose fit/slack or a too tight fit between brush head and handle will have a devastating effect and ultimately compromise the overall user experience of the end-product.

By inclusion of a soft friction enhancing material in/around the connection area between brush-head and handle, the present invention fully overcomes these issues. Due to its particularly high flexibility in terms of compression/expansion as well as ability to quickly restore to its original state again and again, said cushioning material is capable of working across the whole range of size variations (handles and brush heads) to ensure a uniform and sufficiently sturdy connection between brush-heads and handle, both on “loose-fit components” (handle and brush-head) and “tight-fit components”.

The invention further seeks to provide a functional brush-head designed to require an absolute minimum of materials and resources in production. A particularly important objective of the invention is to ensure that an absolute minimum of complexity and materials is included in the short-life-span brush head, and instead incorporate necessary complexity and materials into the handle with its long life span.

In line with the important global focus on design for recyclability, the invention also seeks to provide a brush-head of such material composition that it is suitable for efficient recycling in existing recycling streams, with a minimal loss of raw material during the process. The invention addresses this by a design that promotes clear and easy disassembly and separation of the paintbrush into a few different uniform components for separate recycling.

A final important objective of the invention is to provide a functional paintbrush configured from parts and adapted for processes available in current standard production lines, enabling low-energy- and low-cost manufacturing of the invention without the need of high investments in new technology and processes.

Disclosure of the invention:

The present invention relates to a paintbrush comprising at least two separate members, a brush-head and a handle, said brush-head having a collar and connection cavity adapted to receive portion of the handle by non-rotational sliding, whereby mere friction between side surface and/or base surface of the brush-head’s connection cavity and the surface of the proximate portion of the handle forms a removable connection between brush-head and handle when these are in a connected state, characterized by a soft friction enhancing cushioning material applied onto either the surface of the proximate portion of the handle or the surface of the brush-head’s connection cavity or both for increased frictional connection between brush-head and handle. Various embodiments of the present invention are indicated in present dependent claims 2-10.

A paintbrush comprising two separate parts removably connected to eachother, “removably connected” to be understood as the opposite of “fixedly connected/attached”, i.e. the two main parts, brush-head and handle, being connected to one another in such a way that the connected parts can easily and very swiftly be separated from one another and put together again without the need of tooling and/or without the need to modify any of the two parts such as by for example removing or manipulating fasteners or devices, and where repeat disconnection and connection of the two parts do not notably deteriorate the strength of connection between the parts when in a connected state.

The brush-head comprising a plurality of bristles fixed together in one end by means of hardened adhesive or similar to form a bundle or brush, the base portion of the brush comprising at least the hardened adhesive holding the bristles extending freely away from said base portion, the bristle-holding base portion being further covered and secured by a collar member fitted tightly around the base portion of the brush to form a cylinder, the cylinder extending lengthwise, from the base portion, in the opposite direction to the bristles, to form a first closed end of the cylinder and a second open end of the cylinder and an open cylindrical volume confined between the wall(s) of the cylinder itself and the base portion of the brush, said open volume being capable of receiving a handle corresponding in shape and size to said volume, inserted through said open end by non-rotational sliding into said volume to connect with the brush head. Such open volume included in the brush-head, adapted to receive and connect to a handle, is in the description of the present invention further referred to as the “connection cavity”.

A brush-head according to the present invention may include an additional third member, the intermediate insert. Said intermediate insert being characterized by having its own “connection cavity” substantially corresponding in shape to the cylindrical volume of the collar, so that when attached to the collar the intermediate insert presents the “connection cavity” extending within the volume confined by the collar walls, said connection cavity of the intermediate insert protruding inwards from the open end of the collar and towards the base portion of the brush. The circumference of the general cylindrical shape of an intermediate insert’s connection cavity is generally smaller than that of the collar, so that the smaller connection cavity of the intermediate insert fits within the cavity formed by collar walls and base portion. Such intermediate insert is fixedly attached to either the collar or the base portion of the brush to form part of the brush-head and serve function as its connection cavity.

Regardless of whether the brush-head includes an intermediate insert or not, the ready brush-head presents a connection cavity capable of receiving and forming a removable connection with the handle. Said connection cavity is defined by side-surface(s) and base-surface(s) confining an empty volume, the cavity, being accessible through a top opening. In preferred embodiments of the invention Side-surface(s) extend substantially perpendicular to the base-portion of the brush. The walls of the collar together with the base portion of the brush will also, on embodiments of the invention without intermediate insert, in themselves together constitute side-surface and base-surface of a fully functional connection cavity.

The invention further comprise a handle member, such in form that it is capable of forming a removable connection with the brush-head. The handle has two end portions, a Distal portion and a Proximate portion, said end-portions being positioned substantially opposed to one another on the handle member. In its preferred embodiment, the Proximate portion of the handle has a substantially cylindrical shape, typically oval-like or rectangularlike, corresponding in size and shape to the connection cavity so that when handle is slid into said connection cavity, the proximate portion of the handle will extend within the open volume of the connection cavity ensuring frictional contact between the surface of the handle and the surface(s) of the connection cavity.

In terms of user functionality it is absolute key to achieve a sufficiently tight fit in the connection between brush head and handle on every paintbrush produced. Even small deviations in size and shape of connection cavity and handle may have a notably negative impact on the functionality of the paintbrush. To achieve a consistent result of good fit between the handle and the connection cavity, providing a connection between the two that feels safe and sturdy to the user, a softer friction enhancing cushioning material can be applied as an intermediate layer between handle surface and connection cavity to significantly reduce any movement between the two when in a connected state. A tight fit between handle and brush-head, without notable movement between the two during use, is of utmost importance for the perceived quality and functionality of the paintbrush. The inclusion of soft cushioning material also eliminates any unwanted click-sounds that might otherwise have arised during use of the paintbrush, from movement (collision) between handle and brush-head joined through a loose-fit/high-slack connection between handle and brush-head. Said cushioning material may be applied onto the proximate portion of the handle, or on the inner surfaces of the collar/connection cavity, or on both. Either in only certain critical areas, or covering the entire surface(s) of proximate portion/connection cavity. The mounting of self-adhesive patch(es) of such cushioning material in certain critical areas of the handle’s proximate portion, or in certain critical areas of the brushhead’s collar, is one relevant method of application, and such can be applied either during manufacturing of the handle or brush-head, or supplied to the end-user as separate selfadhesive pieces of material adapted in shape and size to be manually applied onto the proximate portion of the handle by the end-user himself. Foamed materials such as for example neoprene, or felt and similar fabrics with good cushioning properties, can all be suitable options as friction enhancing material. The surface of the connection cavity and/or the surface of the proximate portion of the handle may also for example be coated, in full or in certain areas, with softer friction-enhancing substance, such as rubberfoam, fibre flocking or similar, for an increased frictional connection and cushioning between handle and brushhead. Such friction enhancing substance or material may be applied as liquid- or powdercoating or as patches or laminates of solid material. A collar and/or connection cavity formed from a pre-flocked or pre-felt-laminated sheet of metal could be one method of achieving a friction enhanced surface according to the invention. Likewise would a ready formed handle provided with a felt-patch attached to the surface of its proximate portion, or a handle spray-coated with or dipped into a suitable friction enhancing substance during or post forming of said handle. The surface of the connection cavity and/or the surface of the proximate portion of the handle may also be mechanically formed with an uneven surface rather than a smooth and include such three dimensional structure as ribs or bumps for an increased frictional attachment between handle and brush-head during the sliding connection and disconnection of these.

The invention exploits the different material properties of the handle, the connection cavity and the intermediate layer of soft cushioning material and how these can act together in balance to achieve great functionality of the paintbrush. Whether the cushioning material is applied onto the handle itself or onto the connection cavity, it will when handle and brush-head are assembled for use, form an intermediate layer between handle surface and the surface of the connection cavity. This sandwich structure might comprise three segments of categorically different material properties (especially in terms of density, rigidity and cushioning) to provide a fine-tuned balance of both rigidity and flexibility necessary to provide optimal, uniform and durable functionality of the paintbrush: A typical such “sandwich” would comprise a substantially rigid or semi-rigid segment (the connection cavity) adding support in the connection between handle and brush-head, followed by a cushioning segment of extraordinary flexing ability (quick substantial compression and ability to quickly revert to original shape again and again), followed by yet a rigid or semirigid segment (the handle surface) needed for compression support and a sufficiently rigid connection between brush-head and handle. The cushioning segment might have a categorically different density and cushioning ability than the other two segments, and materials capable of repeat manual compression down to 3/4 - 1/10 of their original thickness could be particularly suitable options and often necessary in order to “absorb” low precision in the manufacturing of the different paintbrush components, i.e. handle, ferrule, brush-head. As rigidity and cushioning are typically two conflicting or contradictory properties in a material, the rigidity required from a material suitable for a functional handle would typically not have sufficient cushioning ability to work well as a cushioning material according to the invention. And, the other way around, the cushioning ability required from a material suitable for a functional cushioning layer according to the invention, would typically not have sufficient rigidity to work well as a paintbrush handle, hence the three segment sandwich, the middle segment having a categorically lower density than the two others, becomes a solution. Cushioning ability suitable for a functional cushioning layer may be found in material categories such as f.ex. foam materials, particularly so flexible foams, certain kinds of fabric/textiles and natural and synthetic fibre materials, to mention some. Typical for these are their flexibility combined with low density, i.e. the overall volume of the unmodified material body includes a lot of air that is easily “squeezed” out of the material by manual pressure to substantially reduce the overall volume of the material, and further their ability to quickly “absorb” air back as soon as compression is released so that the material reverts back to its substantially original volume/shape.

In embodiments of the invention where the friction enhancing cushioning material is applied onto the proximate portion as patch(es) or laminates of solid material, the proximate portion of the handle may have, on its side surface(s), a protruding edge encircling the proximate end surface. The edge can be in form of one continuous element, or several protruding elements positioned in line to form an “edge” or a “rim” circumfering the proximate end surface. Said protruding element(s) protrude(s) from the proximate side surface(s) of the proximate portion, and preferably protrude(s) in a primarily parallel plane to the proximate end surface. Such protruding edge will provide protection to the periphery of the cushioning material, preventing wear and tear from direct collision between any edge of the cushioning material and the top opening edge of the connection cavity during repeat connection of handle and brush-head.

Typical for conventional brushes today is a substantial empty gap between the proximate end portion of the handle and the base portion of the brush while in an assembled state. The handle is then typically fixedly attached to the collar by means of spikes, screws and/or adhesive, hence direct contact between handle and brush is not important for stability in the connection between the two. A preferred feature of the present invention is no or minimal empty gap between the proximate portion of the handle and the base surface of the connection cavity, this to ensure good contact between the handle and the brush-head. The absence of an empty gap between the two contributes to a stabile connection between handle and brush-head without the use of additional means of fastening, such as adhesive or screws which would have formed a fixed connection between the two instead of a removable connection as sought in the present invention.

A handle according to the invention may be formed from any material or combination of materials. In certain embodiments of the invention a handle assembled from two main members could be desirable. A First handle member would typically form the main grip of the handle, comprising the distal portion of the handle and extending in length further therefrom towards an opposite end of said first member, the “Connecting end”, said Connecting end being adapted to fit with and connect to a Second handle member. Such First handle member could typically be made from a conventional handle material of lower cost such as moulded plastic, composite or machined wood. A second member comprising the proximate portion of the handle is adapted to fit with and connect to the Connecting end of the first handle member so that when the two handle members are assembled they form a complete paintbrush handle, first handle member providing the main grip and second handle member comprising the proximate portion of the handle. Such Second handle member could typically be in form of a rigid metal or plastic piece, confining an open and empty volume or a closed and filled volume. In case of an open volume, said second member may be in form of a “cap” or a “ferrule” slid onto or wrapped around the connecting end of the first member. In embodiments of the handle where the first member is made from wood or similar hygroscopic materials of high dimensional instability, a two-part handle may be desirable as a second member made from a more dimensionally stabile material such as f.ex. non-hygroscopic metal or rigid plastic would, when the two handle members are assembled, constrain any dimensional change in the first handle member that may arise due to fluctuations in surrounding temperature and moisture. This would help to ensure a stabile tight fit between the proximate portion of the handle and the brush-head during connection and disconnection of these in different relevant ambient conditions. A two-part handle, as described above, would ensure at least an outer surface of the handle’s proximate portion able to maintain its dimensions in all relevant ambient conditions.

One objective of the invention is to provide a paintbrush comprising a combination of components that can easily be assembled in standard automatic paintbrush assembly lines without notable change in existing tooling, machinery, procedures or production speed. A two-member handle may be beneficial in this regard, as application of friction enhancing cushioning material can be done on the “second handle member” as a separate part and in a separate process prior to final product assembly, ensuring minimal interference with already established standard procedures in both handle manufacturing and final product assembly. A Second handle member, e.g. in form of a moulded metal cap resembling the shape of a standard brush-head ferrule, could thus in a separate process be fitted with soft friction enhancing cushioning material in suitable area(s) (proximate portion), and later be supplied to any standard paintbrush assembly line for connection to a first handle member using the exact same standard automatic assembly methods that are used today for assembling a standard paintbrush handle and a standard brush-head by such means as adhesive, nails and/or similar. The first handle member would thus during production and assembly be processed as any other conventional paintbrush handle, and the second handle member would during assembly be processed as any conventional brush head – loaded, handled and joined to handle.

For improved stability in the connection between handle and brush-head, the side surface of the connection cavity may have at least one embossed/debossed area extending from its opening edge and towards its base surface. This embossed area will form a groove, preferably protruding away from the centre of the connection cavity. A suitable handle can be fitted with at least one “rib” of such suitable shape and size to correspond with and fit said groove as hand in glove so that when handle is slid into the connection cavity, the “rib” on the handle will also slide into its corresponding groove to form contact between the two. Preferably, such rib in the handle protrudes outwards from the rest of the handle surface. Such groove in the connection cavity interrupts also the opening edge of the connection cavity to form an outward protruding section in this to make room for a corresponding rib on the handle when handle is inserted into the connection cavity.

In certain embodiments of the invention, the above mentioned groove may be in form of a cut-out section rather than an embossed/debossed area, said “groove” still allowing a corresponding rib on the handle to slide into it. In embodiments where the groove is in form of a cut-out section instead of an embossed/debossed area, the corresponding rib on the handle may have a recess on each side so that when rib is slid into groove, the edges of the cut-out “groove” slides into said recesses to be held in position by these. The “rib” on the handle may be of any shape and size so long as it corresponds to the groove in terms of position when handle is inserted into connection cavity, and as long as it has a shape and size that fits to the groove in the brush head. The rib may thus be in form of one or several substantially aligned protruding elements f-ex. circular, rectangular or oval in shape.

A brush head according to the invention may preferably have one or more holes penetrating the collar walls to allow for easy hanging of the brush-head in store shelves, racks or other rigs meant for the appropriate and efficient display of brush heads in store.

Brief Description of the Drawings:

Figures 1-2 show basic components of a brush-head according to the invention. Figure 3 shows a standard conventional paintbrush with its typical permanent connection between brush-head and handle. Figures 4 and 6 shows ready assembled paintbrush according to the invention in both a connected and a disconnected state. Figure 5 shows paintbrush according to the invention whereby the handle comprise two handle members, a first and a second handle member connected to eachother. Figure 7-8 show paintbrush according to the invention with two different variants of protruding edge for protection of cushioning material applied to the proximate portion of handle. Figure 9-11 show some different variations of a connection cavity according to the invention. Figure 12 shows a brush-head according to the invention, including an intermediate insert shown as separate part prior to its attachment to brush-head. Figure 13-14 show handle according to the invention where the handle comprise a first handle member and a second handle member. Figure 15 shows a variety of handles according to the invention, each showing possible embodiments of the proximate portion of the handle. Figure 16-19 show different ways of how friction-enhancing material can be applied to brush-head and handle. Figure 20-21 show paintbrush according to the invention with examples of stability increasing groove and rib in brush-head and handle. Figure 22 shows connection cavities with indication of possible appropriate positioning of friction enhancing cushioning material.

Detailed Description of Embodiments of the Invention:

Figure 1 shows perspective view of a brush (1) according to the invention, comprising a plurality of bristles (2) held together by a base portion (3) formed from hardened adhesive.

Figure 2 shows perspective view of a brush-head (4) according to the invention, comprising a brush (1) fixedly attached to a collar (5). In shown embodiment of the invention, said collar constitute also the connection cavity (6) of the brush-head (4). The connection cavity (6) presenting an open cylindrical volume confined between the side surface (7) and base surface (8) of the connection cavity. In shown embodiment of the invention, the base surface (8) of the connection cavity (6) is formed by the base portion (3), base portion (3) and base surface (8) indicated in the figure by dashed line.

Figure 3 shows perspective view of a conventional paintbrush comprising a brushhead (4) fixedly attached to a handle (9) by means of screws (10). The proximate portion (11) of the handle (9) and the base portion (3) of the brush (1) are both covered by the collar (5), but can be seen in the figure as dashed lines. The proximate portion (11) of the handle (9) is such in shape and size that there is limited contact between handle (9) and internal side surface (7) of the collar, nor any direct contact between handle (9) and base portion (3) of the brush. Stabile connection between handle and brush-head is achieved primarily due to the screws (10) fixedly attaching handle to brush-head (4).

Figure 4 shows perspective view of embodiment of the invention in its ready manufactured state, while brush-head and handle being in a disconnected state. The figure defines the proximate portion (11) and the distal portion (12) of the handle (9). It further shows the proximate end surface (13) and proximate side surface(s) (14) together defining the proximate portion (11) of the handle. The figure shows a proximate portion (11) that corresponds in size and shape to the connection cavity (6), promoting contact between the surfaces of the proximate portion (11) and the side surface (7) and base surface (8) of the connection cavity (6), when proximate portion (11) is inserted into connection cavity (6).

Figure 5 shows perspective of embodiment of the invention seen as handle (9) and brush-head (4) with a connection cavity (6) while in a disconnected state, where the handle (9) comprise two separate members assembled together into one handle. The handle comprise a First handle member (26) providing the main grip of the handle, and a Second handle member (27) providing the proximate portion (11) of the handle. The dashed line in the figure defines hidden periphery of the First handle member (26), and further how this has been slid into a cavity in the second handle member for connection between two said members.

Figure 6 shows perspective of embodiment of the invention where handle (9) and brush-head (4) is removably connected to each other by insertion of the handle’s proximate portion into the connection cavity in the brush head to form bond with side-surface and base surface of said connection cavity. The figure shows how proximate portion of the handle corresponds in shape and size to the internal volume of the connection cavity, so that when inserted into the connection cavity, the proximate portion fills said volume to promote a stabile and good fit between handle and brush-head. As seen in the figure, there is tight/direct contact between the proximate end surface (13) and the base surface (8) of the connection cavity, both represented in the figure by dashed line.

Figure 7 shows perspective of embodiment of the invention seen as handle (9) and brush-head (4) with a connection cavity (6) while in a disconnected state. The Figure shows handle assembled from a First handle member (26) and a Second handle member (27). The figure further shows a protruding edge (28), on the proximate side surface(s) (14), encircling the proximate end surface (13). The figure shows the protruding edge in form of one single protruding element. The protruding edge (28) may provide edge protection to any cushioning material applied onto the proximate portion (11) of the handle (9), preventing wear and tear along its edges. The dashed line in the figure indicates boundary between seen protruding edge (28) and proximate end surface (13) of the handle (9).

Figure 8 shows perspective of embodiment of the invention seen as handle (9) and brush-head (4) with a connection cavity (6) while in a disconnected state. The figure further shows a protruding edge (28), on the proximate side surface(s) (14), encircling the proximate end surface (13). The figure shows several aligned protruding elements together constituting the protruding edge (28) encircling the proximate end surface (13). The protruding edge (28) may provide edge protection to any cushioning material applied onto the proximate portion (11) of the handle (9), preventing wear and tear along its edges.

Figure 9 shows top view perspective of a brush-head (4) in its basic form according to the invention. The collar (5) here constitute also the connection cavity (6) of the brushhead (4). Side surface (7) and base surface (8) of the connection cavity (6) are shown in the figure. Base surface (8) is in the shown embodiment of the invention formed by base portion (3) of the brush (1).

Figure 10 shows top view perspective of a brush-head (4), including an intermediate insert (16) according to the invention. The intermediate insert (16) is seen inserted into the cylindrical volume of the collar (5) and fixedly attached thereto. The intermediate insert (16) shown in the figure has a shape and size that corresponds to the cylindrical volume of the collar (5), and when attached to the collar it provides a connection cavity (6) displaying base surface (8) and side surface (7). In this embodiment of the invention, the connection cavity (6) formed by the intermediate insert (16) corresponds in both shape and size to the cylindrical volume of the collar (5).

Figure 11 shows top view perspective of a brush-head (4), including an intermediate insert (16) according to the invention. The intermediate insert (16) is seen inserted into the cylindrical volume of the collar (5) and fixedly attached thereto. The intermediate insert (16) shown in the figure has a shape and size that allows the intermediate insert (16) to be inserted into the cylindrical volume of the collar (5). When attached to the collar (5) the intermediate insert (16) provides a connection cavity (6) displaying base surface (8) and side surface (7). In this embodiment of the invention, the connection cavity (6) formed by the intermediate insert (16) has a notably smaller volume than that of the cylindrical volume of the collar (5), yet the overall shape of the intermediate insert (16) allows for direct contact between and attachment of intermediate insert (16) to collar (5) and/or base portion (3) of the brush (1).

Figure 12 shows perspective of brush head (4) including an alternative embodiment of and intermediate insert (16) prior to assembly of the two by insertion of intermediate insert (16) into- and fixing to the collar (5) and/or base portion (3). Shown intermediate insert (16) having a base surface (8) and side surface (7) forming an open volume, a connection cavity (6), that corresponds in shape and size to the cylindrical volume of the collar (5). The base portion (3) of the brush, covered by the collar (5), is also indicated in the figure by dashed line. The inclusion of a prefabricated intermediate insert (16), as shown in the figure, may strengthen the collar (5) to provide a more solid and more precisely formed connection cavity (6) to ensure tight fit and good frictional connection between handle (9) and connection cavity (6) when these are connected.

Figure 13 shows perspective of embodiment of the invention seen as handle (9) and brush-head (4) with a connection cavity (6) while in a disconnected state. The Figure shows the handle comprising a First handle member (26) and a Second handle member (27) prior to said two members being assembled in production into one complete handle according to the invention. The second handle member (27), in form of a “metal cap” or ferrule, has been produced as a separate part including application of soft friction enhancing cushioning material (22), here shown by light grey colour, onto the handle’s proximate portion (11) prior to assembly with the first handle member. The figure further shows a protruding edge (28), on the proximate side surface(s) (14), encircling the proximate end surface.

Figure 14 shows perspective of the same embodiment of the invention as seen in the previous figure, but after automatic assembly of the first handle member (26) and the second handle member (27) into a complete handle (9) according to the invention. Soft friction enhancing cushioning material (22) applied to the proximate portion (11) of the handle is shown by light grey colour. The figure further shows the brush head (4) prior to connection with the handle.

Figure 15 shows side view of four different variations of handles (9) according to the invention. Well functioning proximate portions (11) may have proximate end surfaces (13) in a range of different sizes and shapes, and end surfaces (13) may be angled in a number of different ways in relation to proximate side surface(s) (14). The shape and size of the connection cavity (6) impacts how the proximate portion (11) of the handle (9) is ultimately optimized, and how its surfaces (13,14) are shaped, sized and angled to ensure best possible fit between handle (9) and a compatible brush-head (4).

Figure 16 shows front view of one embodiment of the handle (9) according to the present invention, with softer friction enhancing cushioning material (22) applied to the proximate portion (11) of the handle (9). Proximate portion (11) of the handle is in the figure defined by dashed line.

Figure 17 shows side view of the same handle (9) as seen in figure 14, with softer friction enhancing cushioning material (22) applied to the proximate portion (11) of the handle (9). Proximate portion (11) of the handle is in the figure defined by dashed line.

Figure 18 shows perspective of brush-head (4) with softer friction enhancing cushioning material (22) applied to the inner surface (7) of the collar /connection cavity (5,6).

Figure 19 shows perspective of brush-head (4) with friction enhancing structure (23), here in form of bumps, mechanically formed in the collar / connection cavity (5,6) from the outer surface of said collar, each bump protruding inwards into the open volume of the connection cavity (6).

Figure 20 shows perspective view of the paintbrush according to the invention while in a disconnected state. The figure shows handle (9) about to slide into the connection cavity (6) of the brush head (4). An outwards protruding groove (24) can be seen in the connection cavity (6) and a corresponding rib (25) can be seen on the handle (9). When handle slides into the connection cavity to connect with brush-head (4), the rib (25) on the handle (9) will slide into the groove (24) in the connection cavity (6) to form interaction between the two.

Figure 21 shows perspective view of the paintbrush according to the invention while in a disconnected state. The figure shows handle (9) about to slide into the connection cavity (6) of the brush head (4). The figure shows the groove (24) in form of a cut-out section in the brush head collar, rather than an embossed/debossed area. The figure further shows a corresponding rib (25) on the handle (9), the “rib” being in form of an oval protrusion corresponding in shape, size and positioning to the groove (24) in the brushhead. When handle (9) slides into the connection cavity (6) to connect with brush-head (4), the rib (25) on the handle (9) will slide into the groove (24) to form interaction between the two.

Figure 22 shows top view of typical overall shape of a connection cavity (6) according to the invention, rectangular-like or oval-like when seen directly towards the opening edge of the cavity. The figure defines connection cavities (6) on basis of a Major axis (29) expressing length of a cavity and a Minor axis (30) expressing width of a cavity. Each axis having two ends on the opening edge of the cavity (6). The figure further indicates two similar alternatives of appropriate positioning of cushioning material (22), said cushioning material being applied either on the handle, in the connection cavity or on both, in at least the areas of the four axis’ ends as shown in the figure.

Claims (1)

1. Claims:

   Claim 1: A paintbrush comprising at least two separate members, a brush-head (4) and a handle (9), said brush-head (4) having a collar (5) and connection cavity (6) adapted to receive portion (11) of the handle (9) by non-rotational sliding, whereby mere friction between side surface (7) and/or base surface (8) of the brush-head’s connection cavity (6) and the surface of the proximate portion (11) of the handle (9) forms a removable connection between brush-head (4) and handle (9) when these are in a connected state, characterized by a soft friction enhancing cushioning material (22) applied onto either the surface of the proximate portion (11) of the handle (9) or the surface of the brush-head’s (4) connection cavity (6) or both for increased frictional connection between brush-head (4) and handle (9).

   Claim 2: A paintbrush according to claim 1, wherein the handle (9) is assembled from a First handle member (26) and a separate Second handle member (27), the First handle member providing the main grip of the handle (9) and the Second handle member providing the proximate portion (11) of the handle (9).

   Claim 3: A paintbrush according to Claim 2, wherein the First handle member (26) is made from a hygroscopic material of low dimensional stability, such as wood, the proximate portion (11) on the Second handle member (27) having at least an outer surface layer of rigid material of high dimensional stability.

   Claim 4: A paintbrush according to any preceding claim, the proximate portion (11) of the handle (9) having a protruding edge (28) encircling the peripheral edge of its proximate end surface (13), said edge in form of one continuous protruding element (28) or several protruding elements (28) positioned in line, said encircling element(s) extending on and protruding out from proximate side surface(s) (14) of the proximate portion (11).

   Claim 5: A paintbrush according to claim 1, its brush-head having a substantially tubular connection cavity (6) defined by an opening edge, the side surface (7) of said connection cavity (6) having at least one embossed/debossed area (24) extending from said opening edge of the connection cavity (6) and towards the base surface (8) of the connection cavity (6) to form a groove (24), said groove protruding away from the centre of the connection cavity (6), said groove interrupting also the opening edge of the connection cavity (6) to form an outward protruding section in this.

   Claim 6: A paintbrush according to claim 5, wherein the groove (24) is a cut-out section rather than an embossed/debossed section.

   Claim 7: A paintbrush according to any of the claims 1-4, wherein the handle (9) has at least one rib (25) on its proximate portion (11), said rib (25) protruding outwards from its directly surrounding surface of the proximate portion (11), and extending lengthwise in some distance along the length of the handle (9).

   Claim 8: A paintbrush according to claim 1, comprising a third member, the intermediate insert (16), securely fixed to the collar (5) and/or to the base portion (3) of the brush-head (4) to present the connection cavity (6) of the brush-head, said cavity (6) substantially confined within the volume surrounded by collar (5) walls.

   Claim 9: A paintbrush according to claim 1, the proximate end surface (13) of the proximate portion (11) of the handle (9) and the opening edge of the corresponding connection cavity (6) both having a primarily rectangular-like or oval-like circumference defined in length by a Major axis (29) and in width by a Minor axis (30), each axis with two end points, the proximate portion (11) of the handle (9) or the connection cavity (6) of the brush-head (4), or both, having soft friction enhancing cushioning material (22) applied to their surfaces in at least the areas surrounding the connection cavity’s four axis-endpoints as positioned when handle (9) and brush-head (4) is in a connected state.

   Claim 10: Paintbrush according to any preceding claim, wherein the soft friction enhancing cushioning material (22) is in form of a separate self-adhesive flat piece of material adapted in shape and size for manual application by an end-user onto the proximate portion (11) of the paintbrush handle (9) or onto the surface of the brush-head’s (4) connection cavity (6) to increase frictional connection between handle (9) and brushhead (4) when these are in a connected state.