WO2012115530A1

WO2012115530A1 - A method of framing pictures, especially paintings on canvas, protecting them against slipping out of the frame, and a folding frame for application of the method

Info

Publication number: WO2012115530A1
Application number: PCT/PL2011/000078
Authority: WO
Inventors: Zbigniew KULESZA
Original assignee: Kulesza Zbigniew Point-Art
Priority date: 2011-02-21
Filing date: 2011-07-18
Publication date: 2012-08-30
Also published as: PL217639B1; PL393971A1

Abstract

The subject of the invention is a method of framing pictures, especially paintings on canvas, in a frame protecting the picture against slipping out of frame composed of channel sections, ends of which, bevelled at appropriate angles and adhering to each other are connected in the resulting corners by means of angle brackets inserted into channels of said sections. The essence of the method consists in that to the inner surfaces of all sides (16) of a polygonal picture canvas (15) with its corners (17) cut off at angle (γ), strip-like stiffening elements (18) are glued, and after wrapping the stiffened picture sides (15) around outer surfaces of channel section elements (2) of folding frame (1) and folding them over upper faces of outer wings (19) of said elements, said stiffened picture sides are located in channels (6) of section elements (2), and then tightened along their whole length by means of string tightening elements (1 1) located also in channels (6), and further, in each corner of frame (1) created by adjoining section elements (2) and their channels (6), flat bar elements (7 and 8) of bendable angle brackets (5) are planted, bent earlier at appropriate angle (β, β' or β"), together with elastic strips (9) joining said flat bar elements, that, together with their protruding ends, adhere to the stiffened picture canvas sides (15).

Description

A method of framing pictures, especially paintings on canvas, protecting them against slipping out of the frame, and a folding frame for application of the method

The subject of the invention is a method of framing pictures, especially paintings on canvas, in a frame protecting the picture against slipping out of frame, and a folding picture frame for application of the method.

Description of Polish utility model application No. Ru-91268 reveals a frame for pictures, composed of four side channel sections with their ends bevelled at angle of 45° and adjacent to each other, with angle brackets located in channels and in corners formed by each pair of said sections and screwed to said sections by means of screws, while said angle brackets are located in channels of said sections after a picture or photograph being earlier slid into them.

Description of Polish industrial design No. Wp- 15307 also reveals certain variations of a rectangular frame for pictures of photographs provided on the back side with peripheral grooves of rectangular cross- section in corners of which angle brackets are planted with cross- section in the form of rectangle height of which equals the depth of said peripheral groove, and pairs of rectangular flat bars adjoining wings of each angle brackets and pressing them against edges of picture canvas covering the front surface of said frame and wrapped around its side surfaces. In certain variants of make of said frame, the angle brackets have circular or U-shaped cross-section. A fundamental flaw and inconvenience of picture frame solutions proposed in the above-quoted design consists in that corner angle brackets employed therein do not ensure permanent tension of the picture canvas creating the possibility of slipping the canvas out of the frame and deformation of surface of the picture mounted in it.

Description of Polish utility model application No. W-88197 reveals a frame for pictures and mirrors in which each of profiled segments is terminated at its corner with a uniform cuboidal housing, walls of which adhere to two parallel angle brackets constituting a stop for them at the same time. The wall contacting the outer angle bracket is provided with a groove for screw, and each of the profiled segments is provided with flat hanger-like projection with a notch made in it.

Further, Polish patent application No. 177128 reveals the element of frame used for tightening slack textiles, especially picture canvases, provided with a strip to which edges of the fabric are attached and characterised in that the straight element of the frame consists of a metal trough guide in longitudinal channel of which a sliding wooden slat is located, profiled in plane perpendicular to its axis and longitudinally divided into a guiding portion, with cross-section form adapted to the form of the guide channel cross-section, and a fastening portion, located outside the channel and slightly wider than the width of the longitudinal channel. Moreover, the wooden slat, throughout its length, is divided into segments according to planes oblique to its long axis. The solution results in improvement of stiffness of the frame structure, eliminating its twisting and bending caused possibly by variable and often unfavourable storage conditions, while division of the slat into segments eliminates risk of damage of picture textile edges resulting from stress related to stretching.

The purpose of the present invention consist in complete elimination of flaws and inconveniences existing in previously known designs of frames for mounting pictures or photographs.

The method of framing picture, especially painted on canvas, in the folding frame according to the invention consists in that to inner surfaces of all sides of a polygonal picture canvas, cut off at acute angles, strip-like stiffening elements are glued, and after wrapping the sides of the painting canvas around outer surfaces of the channel section elements and folding them over upper faces of outer wings of channel section elements, the stiffened sides of the canvas are located in channels of said elements and tightened by means of string tightening elements located also in the channels along the whole circumference. Further, in each of frame corners created by two adjacent sections and their channels, flat elements of angle brackets, bent previously at proper angle, are planted together with elastic strips joining these elements, that, together with their protruding ends, adhere to the stiffened picture canvas sides. Both strip-like elements stiffening the picture canvas sides and elastic strips of bend angle brackets as well as string tightening elements have preferably their outer surfaces rough.

Further, the essence of the concept of folding frame for a picture, especially a painting on canvas, consist in that the frame is additionally provided with tightening string elements planted in channels of section elements, and the brackets joining each pair of channel sections are bendable angle brackets, consisting of two flat bar elements joined, preferably separably, by means of an elastic strip, while ends of said flat bar elements adhering to each other and making wings of the angle bracket are bevelled at appropriate angles depending on the picture canvas geometrical shape. Segments of the elastic strip are made preferably of plastic, with surface preferably rough. Further, ends of the two adjoining flat bar elements are preferably bevelled at angle of 45 or 60° or 30° and the two adjoining channel section elements of the frame, depending on the picture canvas shape, are bevelled at the same angles, respectively.

The method and the folding frame according to the invention have a number of advantageous points, including: provision of picture canvas sides with stiffening elements and tightening them with both string tightening elements and elastic strips of bendable angle brackets that are located in channels of section frame elements, a solution that entirely protects the picture canvas from undesirable slipping out of channels of frame side elements and thus eliminates possibility of the picture surface getting undulated. On the other hand, the use of bendable angle brackets for joining the profiled sections of the frame allows to minimise external dimensions of package containing all components constituting the folding frame kit, as the angle bracket in their straightened form occupy about ¼ of the packaging space compared to the rigid angle brackets used before.

The subject of the invention is shown in different realisation examples in figures, of which: Fig. 1 shows the rear view of complete folding frame kit and a canvas painting mounted therein, in disassembled state; Fig. 2— one of four side frame channel section elements, in the front view; Fig. 3— the same element, in the top view; Fig. 4— the same element, in the vertical cross-section along line A-A; Fig. 5— a bendable corner angle bracket joining two adjacent side frame sections in its straightened form, in the front view; Fig. 6— the same angle bracket, in the top view; Fig. 7— the same angle bracket in its form bent at angle of 90°, in the top view; Fig. 8— a fragment of the joint created at the end of one of four side frame channel sections shown in Fig. 2-4 with one side of the painting canvas and one wing of the corner angle bracket mounted therein, in the top view; Fig. 9— the same fragment of the joint, in the front view; Fig. 10— the same fragment of the joint, in vertical cross-section along line B-B; Fig. 11 — assembled picture frame with picture canvas mounted in it, in the rear view; Fig. 12— cross section of the angle-shaped picture frame hanger along line C-C of Fig. 11 ; Fig. 13— bendable angle bracket of a polygonal folding picture frame allowing to join and fix two adjacent sides thereof at an obtuse angle; and Fig. 14— bendable angle bracket of a polygonal folding picture frame allowing to join and fix two adjacent sides thereof at an acute angle.

The frame (1) for framing pictures protecting picture canvas against slipping out of it in its assembled state is composed of four channel section elements (2), with their upper edges (3) bevelled and ends cut off at angle of a = 45°, constituting sides of the frame, and four identical bendable angle brackets (5) planted in longitudinal channels (6) of section elements (2). Bendable angle brackets (5) joining each pair of frame sides at their bevelled ends (4) are made of two separate flat bar elements (7 and 8), joined by means of elastic strip (9) glued to said elements and made of plastic strap (10) with surface preferably rough, where the adjoining ends of said flat bar elements, constituting wings of the bendable angle bracket (5), are bevelled at angle β = 45°, thus making possible to bend them at angle of 90°. Then, in longitudinal channels (6) of section elements (2), string tightening elements (11) made of plaited plastic and provided with bushings are located, while in one of the channels, one of wings (7) of angle bracket

(12) is located, outer surface of which is covered with thin film of glue

(13) covered with thin plastic film or paper (14), functioning as a hanger for picture (15) mounted in frame ( 1 ) .

The method of framing a picture in frame (1) consists in that to inner surfaces of all shortened sides (16) of a rectangular picture canvas (15) with corners (17) bevelled at angle γ = 45°, strip-like stiffening elements (18) are glued and after wrapping the sides of the painting canvas around outer surfaces of the channel section elements (2) of the frame (1) and folding them over upper faces of outer wings (19) of channel section elements, the stiffened sides of the canvas are located in channels (6) of section elements (2) and then tightened, along the whole length thereof, with string tightening elements (11) provided with bushings and also planted in said channels, and further, in channels (6) of each of corners created by two adjoining channel section elements (2), flat bar elements (7 and 8) of bendable angle brackets (5) are planted, bent previously at angle of 90°, together with elastic strips (9) joining said flat bar elements that, together with their protruding ends, adhere to the stiffened picture canvas sides (15).

In another example realisations of the picture frame of hexagonal, parallelogram or rhomboid shape, not shown in the pictures, analogous channel section elements (2) can be used but, depending on the picture form, with either equal or different lengths, as well as other analogous elements existing in the above-described picture frame presented in Fig. 1, including string tightening elements (11) with bushings, strip- shaped stiffening elements (18), and hangers (12). Bendable angle brackets constituting of two flat bar elements (21 and 22) joined by means of plastic elastic strip (23) glued to them can be employed also in this case, provided that ends of flat bar elements constituting wings of said angle bracket, depending on geometrical form of the picture and the resulting form of the frame, will be bevelled at angle β' = 60° or β" = 30°, while ends of channel section elements (2) constituting sides of the frame will be also bevelled at analogous angles a' = 60° and a" = 30°.

Claims

Patent claims

1. A method of framing pictures, especially paintings on canvas, in a frame protecting the picture against slipping out of said frame, built out of channel section elements, ends of which, bevelled at appropriate angles and adhering to each other in pairs, are joined in corners thus created with angle brackets slipped into channels of the sections characterised in that to inner surfaces of all sides (16) of a polygonal picture canvas (15) with its corners (17) cut off at angle (γ), strip-like stiffening elements are glued (18), and after wrapping sides of the painting canvas around outer surfaces of the channel section elements (2) of the folding frame (1) and folding them over upper faces of outer wings (19) of channel section elements, the stiffened picture sides (15) are located in channels (6) of section elements (2), and then tightened by means of string tightening elements (1 1) located also in channels (6) along the whole circumference of the frame; further, in each of corners of frame (1) created by two adjacent sections (2) and their channels (6), flat bar elements (7 and 8) of bendable angle brackets (5), bent earlier at appropriate angle (β, β' or β"), are planted together with elastic strips (9) joining them that, together with their protruding ends, adhere to the stiffened sides of picture canvas (15).

2. A method according to Claim 1 characterised in that both strip- shaped elements (18) stiffening the picture canvas sides (15) and elastic strips (9) of bendable angle brackets (5) as well as string tightening elements (1 1) have preferably rough outer surfaces.

3. A folding frame for framing pictures, especially paintings on canvas, protecting the picture canvas against slipping out of said frame, constructed from channel section elements in quantity adapted to picture shape and number of its sides, ends of which, bevelled at appropriate angles and adjacent to each other in pairs, are joined in corners thus created by means of angle brackets slipped into channels of the sections characterised in that the frame is additionally provided with string tightening elements (1 1) planted in channels (6) of section elements (2), and angle brackets (5) joining each pair of said channel section elements are bendable angle brackets, composed of two flat bar elements (7 and 8), or (7^' and 8^'), or (7^" and 8") joined, preferably in a detachable manner, by means of elastic strip (9), while the adjoining ends of said flat bar elements constituting wings of angle brackets (5) are bevelled at appropriate angle (β or β' or β") depending on the geometrical form of the picture canvas (15).

4. A folding frame according to Claim 3 characterised in that the elastic strip (9) is made of a segment of plastic strap, with surface preferably rough.

5. A folding frame according to Claim 3 characterised in that the matching ends of flat bar elements (7 and 8) are bevelled preferably at angle β = 45°, ends of flat bar elements {!' and 8') are bevelled preferably at angle β^' = 60°, and ends of flat bar elements (7" and 8") are bevelled preferably at angle β" = 30°.

6. A folding frame according to Claim 3 or Claim 5 characterised in that each of two matching ends of channel section elements (2) of the frame, depending on geometrical form of the picture canvas (15), are bevelled preferably at angle a =45°, or a'=60°, or a"=30°.