CA1184538A - Screen - Google Patents
ScreenInfo
- Publication number
- CA1184538A CA1184538A CA000405110A CA405110A CA1184538A CA 1184538 A CA1184538 A CA 1184538A CA 000405110 A CA000405110 A CA 000405110A CA 405110 A CA405110 A CA 405110A CA 1184538 A CA1184538 A CA 1184538A
- Authority
- CA
- Canada
- Prior art keywords
- bars
- screen
- supporting frame
- lower layer
- screen elements
- 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.)
- Expired
Links
Abstract
Abstract In a screen consisting of a supporting frame (1) which is covered with apertured (6) screen elements (2) of resilient material, said screen elements (2) are well supported and particularly easy to replace without intervention, e.g. by way of welding, as they have longitudinal guide grooves (7) which have a profile serving to be snapped on to the upper layer (3) of the supporting frame (1) and such a depth that the lower layer (4) of the supporting frame (1) engages the underside of the screen elements (2). In a preferred embodiment the wires or bars in the lower layer (4) of the supporting frame are disposed so as to be out of alignment with the apertures (6) of the screen elements so that also the wires in this layer are protected against wear.
Description
A screen The invention relates to a screen consisting of a supporting frame on whose upper side mutually adjoining, apertured .screen elements of resilient material with sub-stantially rectangular borders are detachably attached, The apertured screen elements of resilient material are primarily to serve as wear-resistant screen means proper, but also have the task of protecting the supporting frame a~ainst the wear caused by the material treated by the screen.
llowevcr, the screen elements are nevertheless worn or otherwise damaged over an ex~ended period o~ time, e.g. by ~alling screen material, and must therefore be replaceable.
Norwegian Published Application 142 943 ~published on November 21, 1977, inventor: Kur~ ~olff~ discloses a lS screen of the type mentioned above, in which the replace able screen elements are attached to the supporting frame by means of stud-shaped fasteners. Th s technique is vitiated by the drawback that it requires the use of a very large number of fasteners, which can easily be lost and which can spring up when the frame is deflected~
Moreover, the fasteners are damaged more or less when the screen elements are replaced.
~ .~
Screens have been developed in which the fasteners are integral parts of the screen elements~ However, this involves a very complicated manufacturing process which adds to the manufacturing costs of ~he screen elements.
The integral fasteners moreover break when the indLvidual screen elements are replaced. ~he resulting bottom frame becomes heavy, which reduces the vibra~ion capacity of the machine ~
West German Gebrauchsmus~er No. 7 838 335 applied for by Gummi-Kuper GmbH & Co, Kg. and published on April 5, 1979, discloses a further development of a screen where the screen elements are attached by means of fasteners, which are firmly conrlected to a supporting structure~ These fasteners are rectilinear, specially made metal prQfiles l.S with an upwardly open U-shaped cross-section, whose ~ree forks are extended at th~ top and lockingly engage longitudianl notches in the edges of their respective one of two adjoining screen elements. Thus, the screen elements are only supported at their longitudinal edges
llowevcr, the screen elements are nevertheless worn or otherwise damaged over an ex~ended period o~ time, e.g. by ~alling screen material, and must therefore be replaceable.
Norwegian Published Application 142 943 ~published on November 21, 1977, inventor: Kur~ ~olff~ discloses a lS screen of the type mentioned above, in which the replace able screen elements are attached to the supporting frame by means of stud-shaped fasteners. Th s technique is vitiated by the drawback that it requires the use of a very large number of fasteners, which can easily be lost and which can spring up when the frame is deflected~
Moreover, the fasteners are damaged more or less when the screen elements are replaced.
~ .~
Screens have been developed in which the fasteners are integral parts of the screen elements~ However, this involves a very complicated manufacturing process which adds to the manufacturing costs of ~he screen elements.
The integral fasteners moreover break when the indLvidual screen elements are replaced. ~he resulting bottom frame becomes heavy, which reduces the vibra~ion capacity of the machine ~
West German Gebrauchsmus~er No. 7 838 335 applied for by Gummi-Kuper GmbH & Co, Kg. and published on April 5, 1979, discloses a further development of a screen where the screen elements are attached by means of fasteners, which are firmly conrlected to a supporting structure~ These fasteners are rectilinear, specially made metal prQfiles l.S with an upwardly open U-shaped cross-section, whose ~ree forks are extended at th~ top and lockingly engage longitudianl notches in the edges of their respective one of two adjoining screen elements. Thus, the screen elements are only supported at their longitudinal edges
2~ as there i5 nc supporting frame, and the load capacity o~ the screerl i5 therefore not fully satisfactory.
Another known screen comprises a supporting frame of woven, speciall~ made profile wires which are disposed perpendicularly to one another and to which rubber screen elements are attached, the screen elements being provided along all their edges with downwardly open grooves which can be clamped onto the wire netO The wire net cannot carry large loads without being deflected~ and this con-struction is therefore not capable of supporting the screen elements to a satisfactory degree either. The rubber in the screen elements must moreover be so thin that it can easily be replaced, but this signi~icantly reduces the wear resistance.
~., i The object of the invention is to form the screen elements so that, without the use of loose fas~enersl they can be attached directly to and be firmly supported by a very rigid and pressure resistant supporting frame, which is quite conventionally attached without any intervention in the machine by way of welding, and from which the screen elements are easy to remove or mount in case of replace-ment. It is a further objec~ that the screen is easy to adapt to various mesh sizes by replacing the screen elements by others which have different aperture sizes, but fit on the same supporting rame, which ~an he con ventionally replaced easily and rapidly by a supporting frame of a differen~ module These objects are achieved according to the invention by constructing the screen defined in the foregoing so that the supporting frame consists of an upper and a lower layer of substantially rectilinear r mutually parallel metal bars, the bars in the upper layer being disposed transversely to the bars in the lower layer and joined ~o wlth the bars of said layer in the intersections, each screen element haviny at its underside at least two longitudinal guide grooves located outside the area of the apertures~.said guide grooves having a profile permitting said grooves to be snapped on to the upper layer of bars of the supporting frame, said guide grooves having such a depth that the lower layer of bars of the supporting frame can engage the underside of the screen elements. When the individual screen elements are to be replaced, they are just pulled upwards with a certain force in a direction perpendicular to the plane of the supporting frame so as to remove the clamping effect of a snap fastener nature between the guide grooves and the upper layer of metal bars in the supporting frame~ The new screen elements are then brought into place with the guide grooves just above the upper layer of metal bars and are snapped on by being ,~.
5~
pressed downwards. The overall screen or mesh area can be increased by 20 to 30~ over the previous know~ construc~
tions owing to the effective support provided by the frame.
The supporting frame may be a standard screen of the type which was previously used for screening purposes and which can be mounted on all known screening machines without changing the frame of the machine or its set-up.
The screen elements themselves may have a mesh opening from 1 mm and up to 100-120 mm without any change of the supporting frame. The supporting frame for such a screen may easily be produced even under the simplest manufac~
turing conditions merely by inverting the screen elements alld then placing round bars in the guide grooves, where they may then be attached to form a net, which in turn is welded correctly to~ether when the round bars have been removed from the screen elements.
The m~nu~actured screen elemen~s are also advantageous in term~ o~ casting~ They can be made of plastics or rubber or another resilient material, which may optionally be reln~orcedO
When the wires or bars in the lower layer of the support~
ing frame are disposed so as to be out of alignment with the apertures of the screen elements, provision is made for support to the full extent of the bars in the lo~er layer of the supporting frame, and these bars are covered at the same time and thus protected in their full extent by the screen elements.
The invention will be described more fully below with reference to ~he drawing, which shows a perspective view of an embodiment of a screen according to the invention, seen obliquely from below.
. .. ,~,-, ;3~3 The drawing shows a supporting frame l and two identical screen elements 2, one of which is shown attached to the supporting frame 1, and other is shown in a position vertically above the supporting frame l.
The supporting frame 1 consists of a plurality of recti-linear, mutually parallel metal bars 3, which are disposed in an upper layer, and a plurality of likewise rectilinear~
paralLel metal bars 4, which are disposed perpendicularly to the bars 3 of the upper layer and are a~tached to the underside of the upper metal bars 3, e.g. by welding, in the intersections S of the wires 3,4. It will be noted that the bars 3 of the upper layer and the bars 4 of the lower layer lie in only their own layer. Bars 3 and 4 are generally uniform in shape.
The screen elements 2, which have rectangular borders are provided with aper~ures 6 through which the material to b~ treated i5 passed. The screen elements have on their unclerside three guide grooves 7, which are not aligned with the areas o~ the apertures 6 and have such a profile that they can be snapped on to the upper layer of metal wires 3 in the supportin~ ~rame.
The guide grooves 7 have such a depth that the lower layer of bars 4 of the supporting frame engages the underside of the screen elements 2 when the screen elements are attached to the supporting frame l. Moreover, the metal bars 4 in the lower layer of the supportiny frame l are disp~sed so that they are out of alignment with the apertures 6 of the screen elements 2.
In the shown embodiment the sides 8 and 9 of the guide grooves 7 extend downwardly past the lowest layer of metal bars 4 and are therefore provided with recesses lO at each intersection for the passage of the metal bars 4 .
,.~
Another known screen comprises a supporting frame of woven, speciall~ made profile wires which are disposed perpendicularly to one another and to which rubber screen elements are attached, the screen elements being provided along all their edges with downwardly open grooves which can be clamped onto the wire netO The wire net cannot carry large loads without being deflected~ and this con-struction is therefore not capable of supporting the screen elements to a satisfactory degree either. The rubber in the screen elements must moreover be so thin that it can easily be replaced, but this signi~icantly reduces the wear resistance.
~., i The object of the invention is to form the screen elements so that, without the use of loose fas~enersl they can be attached directly to and be firmly supported by a very rigid and pressure resistant supporting frame, which is quite conventionally attached without any intervention in the machine by way of welding, and from which the screen elements are easy to remove or mount in case of replace-ment. It is a further objec~ that the screen is easy to adapt to various mesh sizes by replacing the screen elements by others which have different aperture sizes, but fit on the same supporting rame, which ~an he con ventionally replaced easily and rapidly by a supporting frame of a differen~ module These objects are achieved according to the invention by constructing the screen defined in the foregoing so that the supporting frame consists of an upper and a lower layer of substantially rectilinear r mutually parallel metal bars, the bars in the upper layer being disposed transversely to the bars in the lower layer and joined ~o wlth the bars of said layer in the intersections, each screen element haviny at its underside at least two longitudinal guide grooves located outside the area of the apertures~.said guide grooves having a profile permitting said grooves to be snapped on to the upper layer of bars of the supporting frame, said guide grooves having such a depth that the lower layer of bars of the supporting frame can engage the underside of the screen elements. When the individual screen elements are to be replaced, they are just pulled upwards with a certain force in a direction perpendicular to the plane of the supporting frame so as to remove the clamping effect of a snap fastener nature between the guide grooves and the upper layer of metal bars in the supporting frame~ The new screen elements are then brought into place with the guide grooves just above the upper layer of metal bars and are snapped on by being ,~.
5~
pressed downwards. The overall screen or mesh area can be increased by 20 to 30~ over the previous know~ construc~
tions owing to the effective support provided by the frame.
The supporting frame may be a standard screen of the type which was previously used for screening purposes and which can be mounted on all known screening machines without changing the frame of the machine or its set-up.
The screen elements themselves may have a mesh opening from 1 mm and up to 100-120 mm without any change of the supporting frame. The supporting frame for such a screen may easily be produced even under the simplest manufac~
turing conditions merely by inverting the screen elements alld then placing round bars in the guide grooves, where they may then be attached to form a net, which in turn is welded correctly to~ether when the round bars have been removed from the screen elements.
The m~nu~actured screen elemen~s are also advantageous in term~ o~ casting~ They can be made of plastics or rubber or another resilient material, which may optionally be reln~orcedO
When the wires or bars in the lower layer of the support~
ing frame are disposed so as to be out of alignment with the apertures of the screen elements, provision is made for support to the full extent of the bars in the lo~er layer of the supporting frame, and these bars are covered at the same time and thus protected in their full extent by the screen elements.
The invention will be described more fully below with reference to ~he drawing, which shows a perspective view of an embodiment of a screen according to the invention, seen obliquely from below.
. .. ,~,-, ;3~3 The drawing shows a supporting frame l and two identical screen elements 2, one of which is shown attached to the supporting frame 1, and other is shown in a position vertically above the supporting frame l.
The supporting frame 1 consists of a plurality of recti-linear, mutually parallel metal bars 3, which are disposed in an upper layer, and a plurality of likewise rectilinear~
paralLel metal bars 4, which are disposed perpendicularly to the bars 3 of the upper layer and are a~tached to the underside of the upper metal bars 3, e.g. by welding, in the intersections S of the wires 3,4. It will be noted that the bars 3 of the upper layer and the bars 4 of the lower layer lie in only their own layer. Bars 3 and 4 are generally uniform in shape.
The screen elements 2, which have rectangular borders are provided with aper~ures 6 through which the material to b~ treated i5 passed. The screen elements have on their unclerside three guide grooves 7, which are not aligned with the areas o~ the apertures 6 and have such a profile that they can be snapped on to the upper layer of metal wires 3 in the supportin~ ~rame.
The guide grooves 7 have such a depth that the lower layer of bars 4 of the supporting frame engages the underside of the screen elements 2 when the screen elements are attached to the supporting frame l. Moreover, the metal bars 4 in the lower layer of the supportiny frame l are disp~sed so that they are out of alignment with the apertures 6 of the screen elements 2.
In the shown embodiment the sides 8 and 9 of the guide grooves 7 extend downwardly past the lowest layer of metal bars 4 and are therefore provided with recesses lO at each intersection for the passage of the metal bars 4 .
,.~
Claims (8)
1. A screen consisting of a supporting frame on whose upper side rectangular, mutually adjoining, apertured screen elements of resilient material are detachably attached, characterized in that the supporting frame consists of an upper and a lower layer of substantially rectilinear, mutually parallel metal bars, the bars in the upper layer being disposed transversely to the bars in the lower layer and joined with the bars of said layer in the intersections, each screen element having at its underside at least two longitudinal guide grooves located outside the areas of the apertures, said guide grooves having a profile permitting said grooves to be snapped on to the upper layer of bars of the supporting frame, said guide grooves having such a depth that the lower layer of bars of the supporting frame can engage the underside of the screen elements.
2. A screen according to claim 1, characterized in that the bars in the lower layer of the supporting frame are disposed so as to he out of alignment with the apertures of the screen elements.
3. A screen which comprises a supporting frame on whose upper side mutually adjoining, apertured screen elements of resilient material with substantially rectangular borders are detachably supported, said supporting frame comprising an upper and a lower layer of substantially rectilinear, mutually parallel metal bars, the bars of the respective layers lying essentially in only their own layer, the bars in the upper layer being disposed transversely to the bars in the lower layer and joined with the bars of said lower layer at intersections of said bars of said respective layers, each screen element having at its underside at least two longitudinal guide grooves located at borders outside the areas of the apertures, said guide grooves being constructed and arranged to be snapped onto the upper layer of bars, said guide grooves having sufficient depth that the lower layer of the bars of the supporting frame can engage the under-side of the screen elements when the screen elements are supported by the upper layer.
4. A screen according to claim 3, in which opposing sides of the guide grooves are provided with recesses for accomo-dating the passage of the transversely extending bars of the lower layer.
5. A screen according to claim 4, in which the bars in the lower layer of the supporting frame are disposed so as to be out of alignment with the apertures of the screen elements.
6. A screen according to claim 3, in which a plurality of apertures in the screen element lie within the rectangular borders of said screen element.
7. A screen according to claim 3, in which the bars of both layers are substantially round.
8. A screen according to claim 3, in which the bars of both layers are substantially uniform in shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000405110A CA1184538A (en) | 1982-06-14 | 1982-06-14 | Screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000405110A CA1184538A (en) | 1982-06-14 | 1982-06-14 | Screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1184538A true CA1184538A (en) | 1985-03-26 |
Family
ID=4123000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000405110A Expired CA1184538A (en) | 1982-06-14 | 1982-06-14 | Screen |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1184538A (en) |
-
1982
- 1982-06-14 CA CA000405110A patent/CA1184538A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |