CA2582853A1 - Bracing system for canvas stretcher frames - Google Patents
Bracing system for canvas stretcher frames Download PDFInfo
- Publication number
- CA2582853A1 CA2582853A1 CA 2582853 CA2582853A CA2582853A1 CA 2582853 A1 CA2582853 A1 CA 2582853A1 CA 2582853 CA2582853 CA 2582853 CA 2582853 A CA2582853 A CA 2582853A CA 2582853 A1 CA2582853 A1 CA 2582853A1
- Authority
- CA
- Canada
- Prior art keywords
- canvas
- stretching
- miters
- stretcher
- corners
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
- B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
- B44D3/18—Boards or sheets with surfaces prepared for painting or drawing pictures; Stretching frames for canvases
Landscapes
- Joining Of Corner Units Of Frames Or Wings (AREA)
Abstract
The present invention relates to the stretching of canvas or other flexible materials on a stretching frame to be displayed without the use of a frame.
This invention is designed to be sold as a kit which can be assembled by an unskilled end user without the use of stretching pliers and staplers (which require considerable strength and skill). The present invention allows for the tucking of the corner folds of canvas inside the mitered corners for a neater result than then the standard stretching systems available today. The finished product will have no side edge fasteners, unsightly corner folds or wrinkles.
This invention is designed to be sold as a kit which can be assembled by an unskilled end user without the use of stretching pliers and staplers (which require considerable strength and skill). The present invention allows for the tucking of the corner folds of canvas inside the mitered corners for a neater result than then the standard stretching systems available today. The finished product will have no side edge fasteners, unsightly corner folds or wrinkles.
Description
BRACING SYSTEM FOR CANVAS STRETCHER FRAMES
FIELD OF INVENTION
This invention concerns canvas stretching frames, and particularly a bracing system for use by novice framers.
BACKGROUND OF THE INVENTION
Most prior art stretchers are manufactured as standard dimension lengths with machined ends. These lengths are assembled into frames with interlocking corners.
The canvas or material is stretched on this frame using stretching pliers and with staples on the side. Wedges can be inserted into the interlocking corner.s to expand the frame and tension the canvas. This embodiment of the product has been around for a long time and works well, however stretcher bars of this type have a few disadvantages:
= When first assembled the stretchers must be squared and aligned by the user or the diagonals will be off making subsequent framing difficult or impossible.
= The stretching of the material on the stretchers requires the use of specific tools like stretching pliers and staple guns both of which are costly and might not be available in the average consumers household.
= The above mentioned stretching system requires a fair amount of skill, strength and practice in order to get good results thus it is intimidating and not user friendly.
= In this type of stretching the staples are normally placed on the side of the stretchers which makes the side edges of the canvas unsightly.
= The corners of the material must be folded and fastened on the sides adding bulk and detracting further from the edge appearance of the finished product.
= The sophisticated nature of the machined ends of the above mentioned stretchers do not allow for resizing and therefore cannot be used if the dimensions of the art work to be stretched does not fall within the standard sizes currently being manufactured.
= Currently available stretchers allow for expansion with the use of wedge inserts into the interlocking corners. These inserts however are often missing from the corners making it impossible to retighten the corners without them.
SUMMARY OF THE INVENTION
The present invention relates to the stretching of canvas or other flexible materials on a stretching frame to be displayed without the use of a frame.
This invention is designed to be sold as a kit which can be assembled by an unskilled end user without the use of stretchina pliers and staplers (which require considerable strength and skill). The present invention allows for the tucking of the corner folds of canvas inside the mitered corners for a neater result than then the standard stretching systems available today. The finished product will have no side edge fasteners, unsightly corner folds or wrinkles.
The present invention provides four stretcher bars mitered at both ends which are adhered to a flexible rectangular material. The stretcher bars are fastened to said material in such a manner that when rotated axially by 90 deg the mitered corners meet to form a closed frame.
A unique feature of the present invention is the use of double sided tape to adhere the canvas to the stretcher bar kit. This is accomplished by allowing the user to adhere the canvas to the stretcher bar kit while it is in the open position.
The canvas is stretched by the rotation of the stretcher bars 90 deg into the final position.
The present invention also deals with the corners of the canvas by allowing the user to fold the canvas into the miters before the frame is rotated into the final and closed frame.
At each mitered corner two grooves are provided which run perpendicular to the length of the bars. A "U" shaped fastener is inserted into these groves to keep the miters from separating.
This invention allow the user to take a canvas and apply it to a stretching frame where the only tool need is a pair of scissors.
BRIEF DISCRIPTION OF DRAWINGS
FIG 1. is an elevation view of the basic stretcher element.
FIG 2. is an elevation view of the U shaped fastener.
FIG 3. is an elevation view of wedge to increase canvas tension.
FIG 4. is an elevation view of the double sided tape.
FIG 5. is an elevation view of the material to which the stretcher bars and the double sided tape is affixed.
FIG 6. is an exploded view of all elements of stretching kit.
FIG 7. is an elevation view of the kit as supplied before attaching of canvas.
FIG 8. is an isometric view of the kit on the canvas showing the cutting of the corners of the canvas and the adhering of the corners to the stretcher bar miters.
FIG 9. is an isometric view of the folding of the kit into the final position along with the insertion of the U shaped fasteners.
FIG 10. is an elevation view of the finished product with the wedge inserts.
DESCRIPTION OF PREFERED EMBODIMENTS
FIG 1. shows the elevation of basic stretcher bar 1. Each bar has a miter at each end 2 as well a groove 3 running parallel to the miter 2. Each stretcher bar will also have a groove 4 located in the center of the longitudinal axis running parallel to the mitered ends 2.
FIG 2. shows the elevation of U shaped fastener 5 which is inserted by hand to keep the stretching frame closed.
FIG 3. shows the elevation of a wedge to be inserted into the closed frame miters from the inside to increase canvas tension.
FIG 4. shows the elevation to the double sided tape 20. This tape is formulated to adhere wood as well as to canvas. The tape 20 has an adhesive substrate covered by strips of release paper to be removed only when the tape is to be used.
This adhesive must have good tack as well as creep resistance.
FIG 5. shows the elevation of the flexible material 6 to which the stretcher bars 1 will be adhered. The corners 7 are notched to allow the stretcher bars to bend along line 8 and meet without the interference of the material from the corners. The material 6 is creased along line 8 to allow for easy bending. There is a perforated rectangle 10 close to crease lines 8. Once the stretching frame is assembled the user is to pull on tab 9 and remove the rectangle 11 defined by the perforations 10.
The removal of rectangle 11 will allow the canvas to breathe from both sides.
Material 6 must be stiff strong, thin and resist tearing. The material 6 must be able to be folded at least 90 deg. without breaking.
FIG 6 shows the exploded view of the prefabricated kit. The stretcher bars are adhered onto material 6 using strips of adhesive 20a or other methods of permanent fastening. Strips of adhesive 20 b are installed onto material 6 on the canvas side and wrapped around onto miters 2. These strips of double sided tape 20 b are left with the release paper to be removed by the user when the canvas is to be mounted.
FIG 7 shows the embodiment of the finished kit. The stretcher bars 1 are pre-positioned and glued on to material 6 in such a way that they will form a closed frame upon being rotated into their final position (once the canvas is installed). The adhesive tape 20 is placed along the outer periphery of the kit and wrapped around each miter 2 to allow for the adhesion of the canvas and the canvas corners inside the miters before closing the stretching frame.
FIG 8. shows the stretching kit positioned over the canvas 35. The adhesive covers have been removed of the double sided tape 20 and the stretching kit is attached to the canvas 35. The corners of the canvas 36 are cut and adhered to the inside of the miters 2.
FIG 9. shows the stretchers 1 being rotated into their final position with the U
shaped fasteners 5 being inserted into grooves 3. U Shaped fasteners must be able to counteract the tension of the canvas and maintain the stretching frame in its closed position.
FIG 10. shows the elevation of the closed stretcher frame once the canvas 30 has been mounted. The U shaped fasteners 5 are fully inserted. Wedges 12 are inserted into the closed miters from the inside and placed closest to the canvas as to allow for an increase in canvas tension if it is required.
Groove 4 is to be used to center the piece when it is be to hung on a nail.
FIELD OF INVENTION
This invention concerns canvas stretching frames, and particularly a bracing system for use by novice framers.
BACKGROUND OF THE INVENTION
Most prior art stretchers are manufactured as standard dimension lengths with machined ends. These lengths are assembled into frames with interlocking corners.
The canvas or material is stretched on this frame using stretching pliers and with staples on the side. Wedges can be inserted into the interlocking corner.s to expand the frame and tension the canvas. This embodiment of the product has been around for a long time and works well, however stretcher bars of this type have a few disadvantages:
= When first assembled the stretchers must be squared and aligned by the user or the diagonals will be off making subsequent framing difficult or impossible.
= The stretching of the material on the stretchers requires the use of specific tools like stretching pliers and staple guns both of which are costly and might not be available in the average consumers household.
= The above mentioned stretching system requires a fair amount of skill, strength and practice in order to get good results thus it is intimidating and not user friendly.
= In this type of stretching the staples are normally placed on the side of the stretchers which makes the side edges of the canvas unsightly.
= The corners of the material must be folded and fastened on the sides adding bulk and detracting further from the edge appearance of the finished product.
= The sophisticated nature of the machined ends of the above mentioned stretchers do not allow for resizing and therefore cannot be used if the dimensions of the art work to be stretched does not fall within the standard sizes currently being manufactured.
= Currently available stretchers allow for expansion with the use of wedge inserts into the interlocking corners. These inserts however are often missing from the corners making it impossible to retighten the corners without them.
SUMMARY OF THE INVENTION
The present invention relates to the stretching of canvas or other flexible materials on a stretching frame to be displayed without the use of a frame.
This invention is designed to be sold as a kit which can be assembled by an unskilled end user without the use of stretchina pliers and staplers (which require considerable strength and skill). The present invention allows for the tucking of the corner folds of canvas inside the mitered corners for a neater result than then the standard stretching systems available today. The finished product will have no side edge fasteners, unsightly corner folds or wrinkles.
The present invention provides four stretcher bars mitered at both ends which are adhered to a flexible rectangular material. The stretcher bars are fastened to said material in such a manner that when rotated axially by 90 deg the mitered corners meet to form a closed frame.
A unique feature of the present invention is the use of double sided tape to adhere the canvas to the stretcher bar kit. This is accomplished by allowing the user to adhere the canvas to the stretcher bar kit while it is in the open position.
The canvas is stretched by the rotation of the stretcher bars 90 deg into the final position.
The present invention also deals with the corners of the canvas by allowing the user to fold the canvas into the miters before the frame is rotated into the final and closed frame.
At each mitered corner two grooves are provided which run perpendicular to the length of the bars. A "U" shaped fastener is inserted into these groves to keep the miters from separating.
This invention allow the user to take a canvas and apply it to a stretching frame where the only tool need is a pair of scissors.
BRIEF DISCRIPTION OF DRAWINGS
FIG 1. is an elevation view of the basic stretcher element.
FIG 2. is an elevation view of the U shaped fastener.
FIG 3. is an elevation view of wedge to increase canvas tension.
FIG 4. is an elevation view of the double sided tape.
FIG 5. is an elevation view of the material to which the stretcher bars and the double sided tape is affixed.
FIG 6. is an exploded view of all elements of stretching kit.
FIG 7. is an elevation view of the kit as supplied before attaching of canvas.
FIG 8. is an isometric view of the kit on the canvas showing the cutting of the corners of the canvas and the adhering of the corners to the stretcher bar miters.
FIG 9. is an isometric view of the folding of the kit into the final position along with the insertion of the U shaped fasteners.
FIG 10. is an elevation view of the finished product with the wedge inserts.
DESCRIPTION OF PREFERED EMBODIMENTS
FIG 1. shows the elevation of basic stretcher bar 1. Each bar has a miter at each end 2 as well a groove 3 running parallel to the miter 2. Each stretcher bar will also have a groove 4 located in the center of the longitudinal axis running parallel to the mitered ends 2.
FIG 2. shows the elevation of U shaped fastener 5 which is inserted by hand to keep the stretching frame closed.
FIG 3. shows the elevation of a wedge to be inserted into the closed frame miters from the inside to increase canvas tension.
FIG 4. shows the elevation to the double sided tape 20. This tape is formulated to adhere wood as well as to canvas. The tape 20 has an adhesive substrate covered by strips of release paper to be removed only when the tape is to be used.
This adhesive must have good tack as well as creep resistance.
FIG 5. shows the elevation of the flexible material 6 to which the stretcher bars 1 will be adhered. The corners 7 are notched to allow the stretcher bars to bend along line 8 and meet without the interference of the material from the corners. The material 6 is creased along line 8 to allow for easy bending. There is a perforated rectangle 10 close to crease lines 8. Once the stretching frame is assembled the user is to pull on tab 9 and remove the rectangle 11 defined by the perforations 10.
The removal of rectangle 11 will allow the canvas to breathe from both sides.
Material 6 must be stiff strong, thin and resist tearing. The material 6 must be able to be folded at least 90 deg. without breaking.
FIG 6 shows the exploded view of the prefabricated kit. The stretcher bars are adhered onto material 6 using strips of adhesive 20a or other methods of permanent fastening. Strips of adhesive 20 b are installed onto material 6 on the canvas side and wrapped around onto miters 2. These strips of double sided tape 20 b are left with the release paper to be removed by the user when the canvas is to be mounted.
FIG 7 shows the embodiment of the finished kit. The stretcher bars 1 are pre-positioned and glued on to material 6 in such a way that they will form a closed frame upon being rotated into their final position (once the canvas is installed). The adhesive tape 20 is placed along the outer periphery of the kit and wrapped around each miter 2 to allow for the adhesion of the canvas and the canvas corners inside the miters before closing the stretching frame.
FIG 8. shows the stretching kit positioned over the canvas 35. The adhesive covers have been removed of the double sided tape 20 and the stretching kit is attached to the canvas 35. The corners of the canvas 36 are cut and adhered to the inside of the miters 2.
FIG 9. shows the stretchers 1 being rotated into their final position with the U
shaped fasteners 5 being inserted into grooves 3. U Shaped fasteners must be able to counteract the tension of the canvas and maintain the stretching frame in its closed position.
FIG 10. shows the elevation of the closed stretcher frame once the canvas 30 has been mounted. The U shaped fasteners 5 are fully inserted. Wedges 12 are inserted into the closed miters from the inside and placed closest to the canvas as to allow for an increase in canvas tension if it is required.
Groove 4 is to be used to center the piece when it is be to hung on a nail.
Claims
1. A stretching kit including a set of parts comprising:
(a) four stretcher bars adhered onto a flexible material with notched corners forming a rectangle. The stretchers are pre aligned and adhered in such a manner that they can be rotated 90 deg axially along the inner edge closest to the flexible material. This results in a closed frame with all the miters meeting;
(b) a special purpose double sided tape affixed to the outer edges of the flexible material opposite the stretcher bars to adhere the canvas to the stretching kit;
(c) a special purpose double sided tape affixed to the miters which allows for the canvas corners to be fastened to the said miters once the canvas corners are cut;
(d) a U shape fastener which is hand inserted into purpose built grooves on the stretcher bar ends to keep the stretching frame closed in its final position;
(e) a perforated rectangular outline on the material to which the stretchers are adhered which can be removed once the canvas has been mounted to allow for the canvas to breathe from both sides;
(f) wedge shaped inserts which can be used to separate the miters and increase the canvas tension;
(g) a groove in the middle of each stretcher running parallel to the miters to allow for easy hanging or the insertion of a cross brace with end tenons.
(a) four stretcher bars adhered onto a flexible material with notched corners forming a rectangle. The stretchers are pre aligned and adhered in such a manner that they can be rotated 90 deg axially along the inner edge closest to the flexible material. This results in a closed frame with all the miters meeting;
(b) a special purpose double sided tape affixed to the outer edges of the flexible material opposite the stretcher bars to adhere the canvas to the stretching kit;
(c) a special purpose double sided tape affixed to the miters which allows for the canvas corners to be fastened to the said miters once the canvas corners are cut;
(d) a U shape fastener which is hand inserted into purpose built grooves on the stretcher bar ends to keep the stretching frame closed in its final position;
(e) a perforated rectangular outline on the material to which the stretchers are adhered which can be removed once the canvas has been mounted to allow for the canvas to breathe from both sides;
(f) wedge shaped inserts which can be used to separate the miters and increase the canvas tension;
(g) a groove in the middle of each stretcher running parallel to the miters to allow for easy hanging or the insertion of a cross brace with end tenons.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2582853 CA2582853A1 (en) | 2007-03-27 | 2007-03-27 | Bracing system for canvas stretcher frames |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2582853 CA2582853A1 (en) | 2007-03-27 | 2007-03-27 | Bracing system for canvas stretcher frames |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2582853A1 true CA2582853A1 (en) | 2008-09-27 |
Family
ID=39787907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2582853 Abandoned CA2582853A1 (en) | 2007-03-27 | 2007-03-27 | Bracing system for canvas stretcher frames |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2582853A1 (en) |
-
2007
- 2007-03-27 CA CA 2582853 patent/CA2582853A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |