CA1091625A - Clamping and tensioning means for loomed devices - Google Patents
Clamping and tensioning means for loomed devicesInfo
- Publication number
- CA1091625A CA1091625A CA271,782A CA271782A CA1091625A CA 1091625 A CA1091625 A CA 1091625A CA 271782 A CA271782 A CA 271782A CA 1091625 A CA1091625 A CA 1091625A
- Authority
- CA
- Canada
- Prior art keywords
- tensioning
- frame
- screen
- longitudinal
- rail
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/48—Stretching devices for screens
Abstract
A B S T R A C T
A tensioning device for screen fabrics and the like according to the present invention comprises a frame and having a pair of longitudinally extending frame members, a tensioning bracket slidably mounted on each longitudinally extending member, a tensioning rail extending transversely between and hingedly connected to the tensioning brackets and mounting means on the frame adapted to engage an end of the screen and tensioning means associated with each tensioning bracket for resiliently urging it towards an end of the frame whereby a tensioning rail tensions a screen fabric in use.
A tensioning device for screen fabrics and the like according to the present invention comprises a frame and having a pair of longitudinally extending frame members, a tensioning bracket slidably mounted on each longitudinally extending member, a tensioning rail extending transversely between and hingedly connected to the tensioning brackets and mounting means on the frame adapted to engage an end of the screen and tensioning means associated with each tensioning bracket for resiliently urging it towards an end of the frame whereby a tensioning rail tensions a screen fabric in use.
Description
~o~zs The inventiDn relates tD a tensioning device For woven Fabrics, screen bottoms and the like prDvided with tension edges, tension folds or the like, particu-larly For the tensioning or Fine and Finest metallic woven Fabrics for the purpose oF sieving, sifting and Filtering, the tensioning device having two par-allel arranged longitudinal stays which, tDgether with two transverse stays connected at right angles or at nearly right angles to the front side, Form a 10 similar rigid frame and in which, iF required, the space limited by the frame is sub-divided by means of a number oF longitudinal and transverse tie-rods into several or multiple parcels oF identicel or different size.
~evices For the Fastening and tensioning oF Filter Fabrics to their supports are known. In drum-type Filters, For example, the woven fabric placed on the outside circumFerence is Fastened and tensioned by means of several pressure ledges which ere pushed into grooves in the drum shell~ In this device, the ledges have to be Fixed by means oF screws, which damage the Fine-meshed, sensitive Filter fabric ln many places. The tightening oF the required large number o~ screws is also time-consum;ng and diFfi-cult. In annther device, the Filter fabric is at- Z
tached to a shaFt in order to be tensionçd by rotat-ing the shaFt. This device used also in Filter screens with Flat surFace has the shortcoming that the ten-sioning on drum-type or arched Filter fabric carri-~30 ers is difficult and uneven over the drum oircumFer-ence as the filter fabric is applied on -the whole cir-cumference, which results in a continuously increasing !
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friction. In the field of screens, and particularly of vibra-tor~screens, devices are known in which the scrQen fabric is attached at both its ends to a fold-shaped plate bordering which is en~aged by a screw-actuated tensioning device. ~lso in this design the tensioning of the sieve fabric is compli-cated and uneven.
In order to avoid this, Federal ~epublic of Germany Patent No.
618,786 has proposed a device for the fastening and tensioninc3 of woven fabrics, and particularly of filter fabrics, on their carrier, in which the ends of the fabric width are fixed to carrier elements on the free edge opposite the hinge axis, said elements being of a valvular design and swivelling into the insert ply of the fabric width.
In a further development of this device, Fecleral Republic of Germany Patent l~o. ~66,466 has made known a tensioning frame for woven fabric screens with at least one tensioning edge provlded on a rotary adjustable clamp bracket on the frame, in wllic~h either the tensionin~ edge of the clamp bracket or its opposite tension-incJ edge of the frame is flexibly mounted in the known manner in the tensioning direction of the screen fabric with respect to the brackets, i.e. to tlle frame, the tensioning edge opposite to t~e clamp opposite to the clamp bracket is made up of a tensionin~ rail movably mounted on the frame by means of inter-mediate rubber hlocks, cup or leaE sprincJs and the like.
The two devices described above have a cornmon feature, namely that very high tensions are often required for the tensionin~
of the screen fabric; hence it is not only necessary to pro-vide very strong spring members, but a very high force is also required in order to push the clamp bracket down into 1~16~S
the plane of the tensionin~ frame after having previously attached the screen fabric to the opposite tensioning ed~es.
This can be achieved often only with great effort and by using special tensioning tools, for example screw clamps. Besides, the not inconsiderable danger of accidents also exists, es-pecially when the screen fabric, which is under great tension, has to be changed, that is removed from the frame. In this case namely, the frame clamp bracket, after loosening the ar-resting device holding it in the plane of the tensioning frame, under the tension of the screen fabric, can suddenly sprin~ up-wards with great force, which can easily result in shop accidents.
In vibratory screens, in which one of the tensionin~ ed~es is flexibly supported over spring members operatin~ in opposite direction to the screen tensioning, but which do not include, however, any swivelling clamp bracket serving as carrier for one of the tensioning ed~es, the provision of additional ad~
justing means which enable the variation of the distance between the opposite lying tensioning edges and the adjustment of the working stroke of the spring members is already known. This makes it possible to apply the screen bottom onto the fra~ with-out any pre-tensionin~ and to produce the desired screen tension-in~ then by an appropriate adjustment of the spacin~ of the opposite tensioning as disclosed in French patent No. 015,0~S.
In another known vibratory screen U.S. Patent No. 1,999,769 it is not the tensioning edges lying opposite in longitudinal dir-ection which are supported flexibly but rather the two tensioning edges lying laterally opposite to one another, namel~ in the clamp shaped brac];ets suspended in the inside walls of the screen frame.
On these brac~ets are mounted th~ bars which~
~916~S
penetrate the screen frame side walls, said bars carrying at their free ends a screw thread with adjustin~ nut ancl spring members between the latter and the screen frame external side. The screen is fully tensioned as a function of said spring members and ~y means of the bars and clamp shaped brackets, whereby the tensioning of the screen can be adjus~ed as desired by operating the adjusting nuts mounted on the bars.
In order to utilize the advantages of the devices described above and to avoid at the same time their negative ~e~s,~ Lal Republic of Germany Patent No. 1,133,22~ discloses a tensioning frame for woven fabric screens with parallel opposite lying tensioning edges, one of said edges ~eing mounted rigidly on the frame whereas the other edge is supported fleYibly against the screen tension by means of spring members in telescopic cylinders, where~y one of the two tensioning edges is designed as swivelable clamp bracket mounted on the frame, said tensionin~ screen distinguishing itself in that the maxium spacing of the two opposite lying tensioning edges is adjustable in the known manner by means of the wor~ing stroke of the sprincJ members which determine the position of the stops, whereby the piston rod of the telescopic cylinclers hincJed on one transverse rail of the frame is provided with an extension passed throucJh the spring member as well as the cylinder front ~ace, said extension carrying at its free end, passed througl a clamping led~e of its clamp brac~et, a screw thread as well as nut wllich forms the adjustahle stop.
~ll the devices described above are imperfect, nowever, in that they do not ma}e it possible to compensate the variation in the parallelism of the opposite lying tensioning edges or tensioning folds, _ 5 - 109~6ZS
caused`by machining tolerances and /or inherent to the type o~ woven ~abric to be tensioned, without producing thereby different tensions o~ the ~abric in dif~erent ~abric zones. The tensioning ~rames provided with a clamp bracket swivelable in the ten-sioning plane o~ the fabric screen are completely useless when it is necessary to stretch fine and ~inest metallic woven fabrics, and particularly those which have a high blinding tendency, which 10~ have tD be equipped with beating members in order tD reduce the blinding tendency.
In ~act, it is possible .to stretch on one tension-ing ~rame o~ the type described above at the same time two superimposed screen ~abrics, the bottom one o~ which has preferably a larger mesh size and in the tensioning direction a predetermined greater length than the ~ine or finest ~abric, so that when the two ~abrics are tensioned jointly the bottom one is tensioned less and hits upwards against the 20.\ tightlier stretched ~abric. In this manner, the blind-ing tendency o~ the ~iner ~abric is countered, but at the same time the wear rate o~ the fine or ~inest ~abrio is accelerated.
A ~urther possibility o~ counteracting the blinding tendenoy o~ the ~ine or ~inest screen ~abric would consist in providing underneath the screen Fabric `.
stretohed on a ~rame o~ the type described above oeating members in the ~orm o~ balls or ralls made oF rubber or rubber-elastio plastios, whereby said beating members are sù$oended by means oF oords and the like under the screen fabric or attached to it.
This is, however, a very complicated and expensive-solution, the ef~iciency o~ which depends addition-ally on the uni~orm arrangement and distribution of the beating members. ~ "
:
,_ . .
.
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- 6 ~ 62S II
Consequently, in the screening and filtering or si~ting DF asbestos fibres, the solution adopted is to nail the fine and finest woven fabrics 5Up- ~.
plied in rolls on a similarly rigid wooden frame.
To counter the blinding tendency, the area limited by the wooden frame is sub-divided by means of lDn-gitudinal and transverse wooden ledges into parcels of identical or approximately identical size, where-by a coarser woven ~abric is nailed on the rear side f the wooden frame so that each parcel ~orms an area enclosed by the fine or ~inest ~abric on one side and by the coarse'fabric on the other side,in which loose ball or roll-shaped beating members are introduced, which are thrown upwards in irregular sequence and with a varying intensity against the fine or finest fabric due to the movements of the machine.
This simple and proven mode of operation, whioh seems initially to require only limited expendi-;20 tures~ involves however major inherent deficienciesand disadvantages. In fact, if there is a change in . the Fibre structure, which happens quite often, the woven fabric being used has to be replaced as a rule by another one with a mesh size consistent with the changed Fibre structure. This could be achieved by ha~ing available a number of frames carrying screen I fabrics oF various mesh sizes; however~ in view of .the size oF the plants for asbestos fibre winning~
this would make the method o~ operation economical-~30 ly inef~icient~
Instead of th;s it is usual today, at changing Fibrestructure, to tear down the still serviceable screen - fabric in use and to nail on a brand-new woven fab-ric with a mesh size matched to the modified fibre structure, which will be torn down also, in turn, ' ' ' i ~ ' .
. 1 _ 7 ~ 6~ 1 as soon as the ~ibre structure has changed ayain.
This involves the des~ruction Dr the still useable, generally not worn out fabric upon i~s remDval rrom the frame, an unjustifiable wasie in view oF the in-creasing shor~age of raw materials, which leads to an avoidable and ecDnomically unacceptable enhancing i~
oF the cost Df asbestos fibre winning.
The purpose o~ the invention described hereunder is to remedy this situation, the consequent aim oF said invention being to provide, on the basis of the ad-vantages oF the devices described above, a woven Fabric tensioning Frame which enables a quick, non-destructive and easy replacement oF the fabric and the compensation to a large extent oF any possible parallelism variations, which counteracts eFficient-ly the blinding tendency, which ensures a longer service liFe Df the screen ~abrios, which warrants an easier handling oF the Frame through a reduced dead weight at higher carrying capacity, and which permits in addition the tensioning of coarser Fab-rics as well as o~ screen bottoms made oF rubber or plastics.
The present invention solves this task by means of a tensioning Frame of the type designated initially in that a tensioning rail can be associated to eac~h oF the parallel transverse stays~ whereby at least one oF said tensioning rails can be mounted movably in the tensionin9 plane and the tensioning direction thereby changing the spaoing of the tensioning rails and hinge-connec~ed preFerably in the tensioning plane tD an adjusting device, which can be ~ixed, in turn, in ar. adjustbble position in the longitu-dinal stays preFerably without changing thereby ~he - ~1 predetermined tensloning Force.
.
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~09~62~ji To this end, each of the longitudinal stays includes in the area of at least one of its two ends on its inside a slot-shaped opening, which is penetrated by t11e end part of an adjusting bracket which engages in turn with its end part a guide made up of elements, whereas the hole provided in the head part of the adjusting brac]cet is penetrated by a bolt, a pin, a screw or the like perpendicular to the screen plane, over which the tensioning rail is hinged swivelably to the adjusting bracket in the tensioning plane. The guide elements are penetrated by a tensioning spindle, and attached mutuall~ spaced to it. The tensioning spindle can be provided with a threaded part at one of its ends, which is guided in a threaded hole of a shiftable bearing located in the interior of the longitudinal stay. With this type of tensioning spindle, it is advantageous to provide the possibly available spring, e.g. the spring cup set, in a heavier design. As an alternative solution, the tensioning spindle can be provided with a threaded section at both ends, one of whicll engages the threaded hole of a shiftable bearing, while the other one penetrates a threaded bush, which is con-nected in turn unshiftably to the front side end of th~ longi-t-udinal stay.
The shiftable bearing and the guide bush are actuated by a s~rin~, particularly by a spring cup set, which is threaded on the tensioning s~indle and arranged between the bearing and the guicle bush.
The longitudinal stays are friction-locked to prism blocks. The longitudinal stays to~ether with the prism blocks can consist thereby of a one-sided design casting section, e.g. made of aluminium or of an aluminium alloy, which includes in the area of the longitudinal stays, on its bottDm side, at least stage-wise openlngs, for example a continuous slot.
~0916ZS
Furthermore, the lnngitudinal stays can be designed as hollDw sections, e.g. rectangular tubes, and the prism blocks can be provided with two extensions at to each other~ one o~ which engages the ~ront side Df the longitudinal stay while the other one engages the adjacent front side of the transverse stay, whereby each prism block has a shaped ~ace on its upper part, the shape and pDsition of which are matched to thst of the tensioning edge or tension-ing fold of the woven fabric or the like.
At least tWD prism blocks of each frame have a hole _ passing thro~gh the side ~acing the longitudinal stay, in which the threaded bush i5 possibly fixed.
A wide-meshed screen fabric or the like is attached on the rear side o~ the longitudinal and transverse stays~ and the space formed by the longitudinal ~nd transverse stays is sub-divided by means o~ longi-tudinal and tr~nsverse tiu-bars ~nto ~everal Dr multiple psrcels of identical or different size,
~evices For the Fastening and tensioning oF Filter Fabrics to their supports are known. In drum-type Filters, For example, the woven fabric placed on the outside circumFerence is Fastened and tensioned by means of several pressure ledges which ere pushed into grooves in the drum shell~ In this device, the ledges have to be Fixed by means oF screws, which damage the Fine-meshed, sensitive Filter fabric ln many places. The tightening oF the required large number o~ screws is also time-consum;ng and diFfi-cult. In annther device, the Filter fabric is at- Z
tached to a shaFt in order to be tensionçd by rotat-ing the shaFt. This device used also in Filter screens with Flat surFace has the shortcoming that the ten-sioning on drum-type or arched Filter fabric carri-~30 ers is difficult and uneven over the drum oircumFer-ence as the filter fabric is applied on -the whole cir-cumference, which results in a continuously increasing !
: .' , :
' ~L0~6ZS
friction. In the field of screens, and particularly of vibra-tor~screens, devices are known in which the scrQen fabric is attached at both its ends to a fold-shaped plate bordering which is en~aged by a screw-actuated tensioning device. ~lso in this design the tensioning of the sieve fabric is compli-cated and uneven.
In order to avoid this, Federal ~epublic of Germany Patent No.
618,786 has proposed a device for the fastening and tensioninc3 of woven fabrics, and particularly of filter fabrics, on their carrier, in which the ends of the fabric width are fixed to carrier elements on the free edge opposite the hinge axis, said elements being of a valvular design and swivelling into the insert ply of the fabric width.
In a further development of this device, Fecleral Republic of Germany Patent l~o. ~66,466 has made known a tensioning frame for woven fabric screens with at least one tensioning edge provlded on a rotary adjustable clamp bracket on the frame, in wllic~h either the tensionin~ edge of the clamp bracket or its opposite tension-incJ edge of the frame is flexibly mounted in the known manner in the tensioning direction of the screen fabric with respect to the brackets, i.e. to tlle frame, the tensioning edge opposite to t~e clamp opposite to the clamp bracket is made up of a tensionin~ rail movably mounted on the frame by means of inter-mediate rubber hlocks, cup or leaE sprincJs and the like.
The two devices described above have a cornmon feature, namely that very high tensions are often required for the tensionin~
of the screen fabric; hence it is not only necessary to pro-vide very strong spring members, but a very high force is also required in order to push the clamp bracket down into 1~16~S
the plane of the tensionin~ frame after having previously attached the screen fabric to the opposite tensioning ed~es.
This can be achieved often only with great effort and by using special tensioning tools, for example screw clamps. Besides, the not inconsiderable danger of accidents also exists, es-pecially when the screen fabric, which is under great tension, has to be changed, that is removed from the frame. In this case namely, the frame clamp bracket, after loosening the ar-resting device holding it in the plane of the tensioning frame, under the tension of the screen fabric, can suddenly sprin~ up-wards with great force, which can easily result in shop accidents.
In vibratory screens, in which one of the tensionin~ ed~es is flexibly supported over spring members operatin~ in opposite direction to the screen tensioning, but which do not include, however, any swivelling clamp bracket serving as carrier for one of the tensioning ed~es, the provision of additional ad~
justing means which enable the variation of the distance between the opposite lying tensioning edges and the adjustment of the working stroke of the spring members is already known. This makes it possible to apply the screen bottom onto the fra~ with-out any pre-tensionin~ and to produce the desired screen tension-in~ then by an appropriate adjustment of the spacin~ of the opposite tensioning as disclosed in French patent No. 015,0~S.
In another known vibratory screen U.S. Patent No. 1,999,769 it is not the tensioning edges lying opposite in longitudinal dir-ection which are supported flexibly but rather the two tensioning edges lying laterally opposite to one another, namel~ in the clamp shaped brac];ets suspended in the inside walls of the screen frame.
On these brac~ets are mounted th~ bars which~
~916~S
penetrate the screen frame side walls, said bars carrying at their free ends a screw thread with adjustin~ nut ancl spring members between the latter and the screen frame external side. The screen is fully tensioned as a function of said spring members and ~y means of the bars and clamp shaped brackets, whereby the tensioning of the screen can be adjus~ed as desired by operating the adjusting nuts mounted on the bars.
In order to utilize the advantages of the devices described above and to avoid at the same time their negative ~e~s,~ Lal Republic of Germany Patent No. 1,133,22~ discloses a tensioning frame for woven fabric screens with parallel opposite lying tensioning edges, one of said edges ~eing mounted rigidly on the frame whereas the other edge is supported fleYibly against the screen tension by means of spring members in telescopic cylinders, where~y one of the two tensioning edges is designed as swivelable clamp bracket mounted on the frame, said tensionin~ screen distinguishing itself in that the maxium spacing of the two opposite lying tensioning edges is adjustable in the known manner by means of the wor~ing stroke of the sprincJ members which determine the position of the stops, whereby the piston rod of the telescopic cylinclers hincJed on one transverse rail of the frame is provided with an extension passed throucJh the spring member as well as the cylinder front ~ace, said extension carrying at its free end, passed througl a clamping led~e of its clamp brac~et, a screw thread as well as nut wllich forms the adjustahle stop.
~ll the devices described above are imperfect, nowever, in that they do not ma}e it possible to compensate the variation in the parallelism of the opposite lying tensioning edges or tensioning folds, _ 5 - 109~6ZS
caused`by machining tolerances and /or inherent to the type o~ woven ~abric to be tensioned, without producing thereby different tensions o~ the ~abric in dif~erent ~abric zones. The tensioning ~rames provided with a clamp bracket swivelable in the ten-sioning plane o~ the fabric screen are completely useless when it is necessary to stretch fine and ~inest metallic woven fabrics, and particularly those which have a high blinding tendency, which 10~ have tD be equipped with beating members in order tD reduce the blinding tendency.
In ~act, it is possible .to stretch on one tension-ing ~rame o~ the type described above at the same time two superimposed screen ~abrics, the bottom one o~ which has preferably a larger mesh size and in the tensioning direction a predetermined greater length than the ~ine or finest ~abric, so that when the two ~abrics are tensioned jointly the bottom one is tensioned less and hits upwards against the 20.\ tightlier stretched ~abric. In this manner, the blind-ing tendency o~ the ~iner ~abric is countered, but at the same time the wear rate o~ the fine or ~inest ~abrio is accelerated.
A ~urther possibility o~ counteracting the blinding tendenoy o~ the ~ine or ~inest screen ~abric would consist in providing underneath the screen Fabric `.
stretohed on a ~rame o~ the type described above oeating members in the ~orm o~ balls or ralls made oF rubber or rubber-elastio plastios, whereby said beating members are sù$oended by means oF oords and the like under the screen fabric or attached to it.
This is, however, a very complicated and expensive-solution, the ef~iciency o~ which depends addition-ally on the uni~orm arrangement and distribution of the beating members. ~ "
:
,_ . .
.
-- . ; ! . ' - ` ' ' ~ ' ' ' " ' ' ' `
- 6 ~ 62S II
Consequently, in the screening and filtering or si~ting DF asbestos fibres, the solution adopted is to nail the fine and finest woven fabrics 5Up- ~.
plied in rolls on a similarly rigid wooden frame.
To counter the blinding tendency, the area limited by the wooden frame is sub-divided by means of lDn-gitudinal and transverse wooden ledges into parcels of identical or approximately identical size, where-by a coarser woven ~abric is nailed on the rear side f the wooden frame so that each parcel ~orms an area enclosed by the fine or ~inest ~abric on one side and by the coarse'fabric on the other side,in which loose ball or roll-shaped beating members are introduced, which are thrown upwards in irregular sequence and with a varying intensity against the fine or finest fabric due to the movements of the machine.
This simple and proven mode of operation, whioh seems initially to require only limited expendi-;20 tures~ involves however major inherent deficienciesand disadvantages. In fact, if there is a change in . the Fibre structure, which happens quite often, the woven fabric being used has to be replaced as a rule by another one with a mesh size consistent with the changed Fibre structure. This could be achieved by ha~ing available a number of frames carrying screen I fabrics oF various mesh sizes; however~ in view of .the size oF the plants for asbestos fibre winning~
this would make the method o~ operation economical-~30 ly inef~icient~
Instead of th;s it is usual today, at changing Fibrestructure, to tear down the still serviceable screen - fabric in use and to nail on a brand-new woven fab-ric with a mesh size matched to the modified fibre structure, which will be torn down also, in turn, ' ' ' i ~ ' .
. 1 _ 7 ~ 6~ 1 as soon as the ~ibre structure has changed ayain.
This involves the des~ruction Dr the still useable, generally not worn out fabric upon i~s remDval rrom the frame, an unjustifiable wasie in view oF the in-creasing shor~age of raw materials, which leads to an avoidable and ecDnomically unacceptable enhancing i~
oF the cost Df asbestos fibre winning.
The purpose o~ the invention described hereunder is to remedy this situation, the consequent aim oF said invention being to provide, on the basis of the ad-vantages oF the devices described above, a woven Fabric tensioning Frame which enables a quick, non-destructive and easy replacement oF the fabric and the compensation to a large extent oF any possible parallelism variations, which counteracts eFficient-ly the blinding tendency, which ensures a longer service liFe Df the screen ~abrios, which warrants an easier handling oF the Frame through a reduced dead weight at higher carrying capacity, and which permits in addition the tensioning of coarser Fab-rics as well as o~ screen bottoms made oF rubber or plastics.
The present invention solves this task by means of a tensioning Frame of the type designated initially in that a tensioning rail can be associated to eac~h oF the parallel transverse stays~ whereby at least one oF said tensioning rails can be mounted movably in the tensionin9 plane and the tensioning direction thereby changing the spaoing of the tensioning rails and hinge-connec~ed preFerably in the tensioning plane tD an adjusting device, which can be ~ixed, in turn, in ar. adjustbble position in the longitu-dinal stays preFerably without changing thereby ~he - ~1 predetermined tensloning Force.
.
~' I
',' ' , . ~, :,`, , ,' I
~09~62~ji To this end, each of the longitudinal stays includes in the area of at least one of its two ends on its inside a slot-shaped opening, which is penetrated by t11e end part of an adjusting bracket which engages in turn with its end part a guide made up of elements, whereas the hole provided in the head part of the adjusting brac]cet is penetrated by a bolt, a pin, a screw or the like perpendicular to the screen plane, over which the tensioning rail is hinged swivelably to the adjusting bracket in the tensioning plane. The guide elements are penetrated by a tensioning spindle, and attached mutuall~ spaced to it. The tensioning spindle can be provided with a threaded part at one of its ends, which is guided in a threaded hole of a shiftable bearing located in the interior of the longitudinal stay. With this type of tensioning spindle, it is advantageous to provide the possibly available spring, e.g. the spring cup set, in a heavier design. As an alternative solution, the tensioning spindle can be provided with a threaded section at both ends, one of whicll engages the threaded hole of a shiftable bearing, while the other one penetrates a threaded bush, which is con-nected in turn unshiftably to the front side end of th~ longi-t-udinal stay.
The shiftable bearing and the guide bush are actuated by a s~rin~, particularly by a spring cup set, which is threaded on the tensioning s~indle and arranged between the bearing and the guicle bush.
The longitudinal stays are friction-locked to prism blocks. The longitudinal stays to~ether with the prism blocks can consist thereby of a one-sided design casting section, e.g. made of aluminium or of an aluminium alloy, which includes in the area of the longitudinal stays, on its bottDm side, at least stage-wise openlngs, for example a continuous slot.
~0916ZS
Furthermore, the lnngitudinal stays can be designed as hollDw sections, e.g. rectangular tubes, and the prism blocks can be provided with two extensions at to each other~ one o~ which engages the ~ront side Df the longitudinal stay while the other one engages the adjacent front side of the transverse stay, whereby each prism block has a shaped ~ace on its upper part, the shape and pDsition of which are matched to thst of the tensioning edge or tension-ing fold of the woven fabric or the like.
At least tWD prism blocks of each frame have a hole _ passing thro~gh the side ~acing the longitudinal stay, in which the threaded bush i5 possibly fixed.
A wide-meshed screen fabric or the like is attached on the rear side o~ the longitudinal and transverse stays~ and the space formed by the longitudinal ~nd transverse stays is sub-divided by means o~ longi-tudinal and tr~nsverse tiu-bars ~nto ~everal Dr multiple psrcels of identical or different size,
2~ and a number of ball- or roll-shaped beating bodies are introduced in each parcel, whereby the trans-verse tie-bars have pre~erably on one side an in-clined rebounding surfece sloped in the transport direction.
The invention is represented in Figs. i to 4J
they show:
Fig. 1 the ten5ioning device in three-dimensional representation~
Fig. 2 the adjusting device operating in the screen plan~
Fig. 3 a prism block, also in three-dinensional representation~
Fig. 4 the area of two successive tensioning devices.
- ' - . ,', ' ' ' 109~
As illustrated by Fig. 1, the tensiDning device consists ~f tw~ longitudinal stays 1, parallel tD
one another and ~rictionally connected ~ver two transverse stays 2. In the represented example, a tensioning rail 3 is associated only to the ri~ht-hand transverse stay 2, said tensioning rail being shi~tably mounted in the tensioning plane and adjust-able by ~eans of the adjusting device 4. It is in the spirit n~ the invention to provide also the left-hand transverse stay with a shi~table tensioningrailJ the statements hereunder apply therefore anal-ogously also to such a case.
The longitudinal stays 1 consist pre~erably o~ a light metal, e.g. aluminium, and are designed as hollow sections~ whereas the transverse stays 2 are an angle section o~ light metal, such as aluminium.
The tensioning rail 3 is a C-shaped section~ also made o~ a light material, which is hinge-connected at both ends to an adjusting device 4, which i5 lo-cated in turn in the front side end of a longitudi-nal stay 1.
For the tensioning o~ coarser or wide-meshed wire fabrics or screen bottoms of rubber or plastics the tensioning frame can include a number of transverse tie-bars 23 oF simple design arranged transversally to the screening direction, i.e. to the longitudi-nal stretch of stays 1, the mounting faces o~ which are arranged in a common plane or in di~ferent planes.
In the specially selected case of the tensioning o~
~ine and finest fabrics, the space formed by the longitudinal and transverse stays 1,2 is sub-divided ~into several or multiple parcels Z4 of identical or different size, whereby the transverse stays 2~ have pre~erably an angular cross-section, which forms on one side an inclined rebounding surface 25 sloped in the screening or transport direction.
.,.. ~ .
-~
, ~ . .
916~5 On th~ rear side ~f th~ longitudinal and transverse stays 1,2 there is fixed interchangeably pre~erably a wide-mesh~d fabric 21 Dr the like, which fcrms together with the longitudinal and transverse stays 22,23 bnx-shaped, open-~op parcels 24, in which a number of loDse ball- or roll-shaped beating bodies 27 are introduced, said bodies bounding during the operation upwards against the tensioned fine or finest fabric which covers the parcels 24 from above.
In order to increase the effect of the beating ele-ments 27, it is possible to arrange the bars 28, and particularly round bars, in the parcels 24 trans-versally to the screening or transport direction~
said bars being mounted preferably directly over the wide-meshed ~abric 21. This ensures that a twist is imparted to the beating bodies 27.
As explained already initially, fine and finest wo-ven fabrics present fabrication-caused inaccuracies or edge lengths, which act counter to the need o~ a uniForm application of the tensioning force to the screen Fabric. In order to remove this e~fect~ it is proposed in accordanoe with the invention to mount the shiftable tensioning rail 3 swivelably ~
in the screening plane and to connect it horizontal-ly shiftable to the adjusting device.
To this end, the tensioning rail 3 is connected swivelably at its ends over a bolt~ pin, screw or the like to an adjusting bracket 7, whereby the bolt or the like penetrates the vertical hole 9 of the adjusting braoket 7~ which penetrates~in turn with its end part 6 a slot 5 provided on the inside of the longitudinal sta~ 1 and engages a guide7 which is Formed by two guide elements 8 spaced-mounted on a guide bush 14. The guide bush 14 is penetrated in turn by a tensioning spindle 10, which has a threaded `' '-' - ' '' : :
, - ~2 ~ 1~91~
.
psrt 11 at both ends, one o~ which ~or example has a right-hand thread and penetrates the threaded hole 12 of a bearing member 13 shi~table in the inside of the longitudinal stay 1, while the other threaded part 11 has for example a left-hand thread and pene-trates a threaded bush 15, which is connected in turn unshi~tably to the Front slde end or the lon-gitudinal stay 1. Holding-down devices 31, e.g.three selF-lubrica~ing bearings ~ixed in fork-shaped lugS, can ensure an additional ~astening o~ $he tension-ing rail ~, whereby a free leg oF the tensioning rail reaches underneath the holding-down device.
ln order to enable an aùtomatic re-tensioning in case of lengthening oF the screen Fabric, the shift-able bearing 12 and the guide bush 14 are actuated by a spring and particularly a cup spring set 16, which is mounted on the tensioning spindle 10 and arranged between the bearing 12 and the guide bush 14.
Fig. 2 shows a cross-section through the adjusting device 4 represented in Fig. 1~ The adjusting device i5 looated in the inside o~ the longitudinal stays 1.
It includes an adjusting bracket 7, which is rigid-ly connected to the slide bush 14, whereby two slide bearings 29 carry the slide bush 14. The slide bush 14 engages in the area o~ one oF its ends the cylin-drical extension 30 aF the shi~ting bearing 13l which is penetraked by the tensioning spindle 10 and threaded on the spring set 16.
As an alternative solution it is possible to pro-vide an adjusting device with a tensioning spindle, in which the tensioning spindle has a threaded part only at Dne end~ e.g. in the area oF the shiFting bearing. Such an adjusting device, which is not shown, cDnsists basically oF the same elements. On-ly the threaded bush 15 can be eliminated. Further-- l .
_ 13 - 1091625 morel the spring se~ can be o~ a heavier design.
In this adjusting device, the adjusting spindle head does nDt project out of the prism block bore.
Fig. 2 shows additionally another cross-section thrDugh the adjusting device. This illustrates a section along the line A - B o~ the main dra~ing of Fig. 2. As ayainst the main drawing o~ Fig. Z, the longitudinal stay 1 is designed in the form o~ a oasting section in this example. The material used therefor is preferably a light metal~ e.g. aluminium or an aluminium alloy. The longitudinal stay 1 con-sists mainly o~ a hoilow section, which includes on its bo'tom side at least stagewise openings, e.g. a slot, into which parts of the adjusting device can be introduced. Furthermore, one or more recesses can be provided on the top side o~ the longitudinal stay 1, which form, in oonjunction with a web, e.g.
a heavy clamp pin, a lug. This enables an easy mount-ing and dismounting of the complete ~rame by means of lifting hooks. The bottom side of the longitudi-nal stay is equipped at least in the area of its ends with a stop face. The prism blocks can Form together with the longitudinal stays the one-piecs casting section. however, it is also possible to make the prism blocks separate From the longitudi-nal stays designed as casting sections~ and to at-tach them then rigidly to the longitudinal stays~
e.g. by welding.
Fig. 9 shows a prism block za, which has two exten-sions 17,18 at right angles to one another, of which the extension 17 engages the front end o~ the lon-gitudinal stay 1 and the extension 18 engages the adjacent -~ront side oF the transverse stay 2. Each prism block ZO has a shaped face 19 on its upper part, the shape and position of which are matched to those oF the tensioning edge or of the tension-ing fold of the screen fabric 26. As illus~rated, ..
~O~ S
the prism block 20 is penetrated in the direction of its extension 17 ~y a hole, in which the guide bush 15 is fixed.
Holding-down devices 31 can be provided on the prism blocks 20 in the area of the extension 18~
The shaped face 1~ of the prism block 20 has a positive effect particularly when two or more tenslonincJ devices are arran~ed successively on a screening or sifting machine, as shown in Fig. 4; this arrangementsimplifiæ the tensioning or detensioning of the woven fabric or screen bottom.
The longitudinal or transverse stays 1, 2 as well as the long-itudinal and transverse tie-bars 22, 23 are made preferably of a liyht metal, e.g. aluminium.
Fig. 4 is a cross-section through the two transverse stays of adjacent frames, with a tensioning rail 3 associated to the left-hand stay. The tensioning rall 3, with a mainly C~shaped cross-section, reaches with its free lower leg underneath the holcling-down device 31 which is in the form o~ a roller, and is thereby additionally secured. A wire fabric, Eor example, is attached to the other upper leg of the tensioning rail 3. The riyht-~ hand transverse stay has an S-shaped cross-sectional clesign.
The upper leg fixes thereby a wire fabric, whereas the lower le~ forms a supporting surface. I~he space defined by the lower le~ as well as a mainly perpenclicular and a central stay is e~uippecl towards the screening surface with a stop 32, e.g. a rouncl wire running parallel to the transverse stay and welded at the ends.
The stop 32 prevents the escape of the beating elements, e.g.
beating balls, intro~uced in this space. These beating elements protect the transverse stays against clogging by excessive sedi-mentation. Furthermore, these beating elements can serve also to prevent a pressing down- _ lC~916ZS
D~ the central stay and or the upper leg. Cons2-quently, the upper leg cannot be li~ted by the clamp-ing ~orces acting upon it and resulting frDm the ten-sioning o~ the ~abric or o~ the screen bottom, which `~
makes it pDssible to ensure a reliable ~astening o~
the ~abric or o~ the screen bottom.
Patent cl~ims
The invention is represented in Figs. i to 4J
they show:
Fig. 1 the ten5ioning device in three-dimensional representation~
Fig. 2 the adjusting device operating in the screen plan~
Fig. 3 a prism block, also in three-dinensional representation~
Fig. 4 the area of two successive tensioning devices.
- ' - . ,', ' ' ' 109~
As illustrated by Fig. 1, the tensiDning device consists ~f tw~ longitudinal stays 1, parallel tD
one another and ~rictionally connected ~ver two transverse stays 2. In the represented example, a tensioning rail 3 is associated only to the ri~ht-hand transverse stay 2, said tensioning rail being shi~tably mounted in the tensioning plane and adjust-able by ~eans of the adjusting device 4. It is in the spirit n~ the invention to provide also the left-hand transverse stay with a shi~table tensioningrailJ the statements hereunder apply therefore anal-ogously also to such a case.
The longitudinal stays 1 consist pre~erably o~ a light metal, e.g. aluminium, and are designed as hollow sections~ whereas the transverse stays 2 are an angle section o~ light metal, such as aluminium.
The tensioning rail 3 is a C-shaped section~ also made o~ a light material, which is hinge-connected at both ends to an adjusting device 4, which i5 lo-cated in turn in the front side end of a longitudi-nal stay 1.
For the tensioning o~ coarser or wide-meshed wire fabrics or screen bottoms of rubber or plastics the tensioning frame can include a number of transverse tie-bars 23 oF simple design arranged transversally to the screening direction, i.e. to the longitudi-nal stretch of stays 1, the mounting faces o~ which are arranged in a common plane or in di~ferent planes.
In the specially selected case of the tensioning o~
~ine and finest fabrics, the space formed by the longitudinal and transverse stays 1,2 is sub-divided ~into several or multiple parcels Z4 of identical or different size, whereby the transverse stays 2~ have pre~erably an angular cross-section, which forms on one side an inclined rebounding surface 25 sloped in the screening or transport direction.
.,.. ~ .
-~
, ~ . .
916~5 On th~ rear side ~f th~ longitudinal and transverse stays 1,2 there is fixed interchangeably pre~erably a wide-mesh~d fabric 21 Dr the like, which fcrms together with the longitudinal and transverse stays 22,23 bnx-shaped, open-~op parcels 24, in which a number of loDse ball- or roll-shaped beating bodies 27 are introduced, said bodies bounding during the operation upwards against the tensioned fine or finest fabric which covers the parcels 24 from above.
In order to increase the effect of the beating ele-ments 27, it is possible to arrange the bars 28, and particularly round bars, in the parcels 24 trans-versally to the screening or transport direction~
said bars being mounted preferably directly over the wide-meshed ~abric 21. This ensures that a twist is imparted to the beating bodies 27.
As explained already initially, fine and finest wo-ven fabrics present fabrication-caused inaccuracies or edge lengths, which act counter to the need o~ a uniForm application of the tensioning force to the screen Fabric. In order to remove this e~fect~ it is proposed in accordanoe with the invention to mount the shiftable tensioning rail 3 swivelably ~
in the screening plane and to connect it horizontal-ly shiftable to the adjusting device.
To this end, the tensioning rail 3 is connected swivelably at its ends over a bolt~ pin, screw or the like to an adjusting bracket 7, whereby the bolt or the like penetrates the vertical hole 9 of the adjusting braoket 7~ which penetrates~in turn with its end part 6 a slot 5 provided on the inside of the longitudinal sta~ 1 and engages a guide7 which is Formed by two guide elements 8 spaced-mounted on a guide bush 14. The guide bush 14 is penetrated in turn by a tensioning spindle 10, which has a threaded `' '-' - ' '' : :
, - ~2 ~ 1~91~
.
psrt 11 at both ends, one o~ which ~or example has a right-hand thread and penetrates the threaded hole 12 of a bearing member 13 shi~table in the inside of the longitudinal stay 1, while the other threaded part 11 has for example a left-hand thread and pene-trates a threaded bush 15, which is connected in turn unshi~tably to the Front slde end or the lon-gitudinal stay 1. Holding-down devices 31, e.g.three selF-lubrica~ing bearings ~ixed in fork-shaped lugS, can ensure an additional ~astening o~ $he tension-ing rail ~, whereby a free leg oF the tensioning rail reaches underneath the holding-down device.
ln order to enable an aùtomatic re-tensioning in case of lengthening oF the screen Fabric, the shift-able bearing 12 and the guide bush 14 are actuated by a spring and particularly a cup spring set 16, which is mounted on the tensioning spindle 10 and arranged between the bearing 12 and the guide bush 14.
Fig. 2 shows a cross-section through the adjusting device 4 represented in Fig. 1~ The adjusting device i5 looated in the inside o~ the longitudinal stays 1.
It includes an adjusting bracket 7, which is rigid-ly connected to the slide bush 14, whereby two slide bearings 29 carry the slide bush 14. The slide bush 14 engages in the area o~ one oF its ends the cylin-drical extension 30 aF the shi~ting bearing 13l which is penetraked by the tensioning spindle 10 and threaded on the spring set 16.
As an alternative solution it is possible to pro-vide an adjusting device with a tensioning spindle, in which the tensioning spindle has a threaded part only at Dne end~ e.g. in the area oF the shiFting bearing. Such an adjusting device, which is not shown, cDnsists basically oF the same elements. On-ly the threaded bush 15 can be eliminated. Further-- l .
_ 13 - 1091625 morel the spring se~ can be o~ a heavier design.
In this adjusting device, the adjusting spindle head does nDt project out of the prism block bore.
Fig. 2 shows additionally another cross-section thrDugh the adjusting device. This illustrates a section along the line A - B o~ the main dra~ing of Fig. 2. As ayainst the main drawing o~ Fig. Z, the longitudinal stay 1 is designed in the form o~ a oasting section in this example. The material used therefor is preferably a light metal~ e.g. aluminium or an aluminium alloy. The longitudinal stay 1 con-sists mainly o~ a hoilow section, which includes on its bo'tom side at least stagewise openings, e.g. a slot, into which parts of the adjusting device can be introduced. Furthermore, one or more recesses can be provided on the top side o~ the longitudinal stay 1, which form, in oonjunction with a web, e.g.
a heavy clamp pin, a lug. This enables an easy mount-ing and dismounting of the complete ~rame by means of lifting hooks. The bottom side of the longitudi-nal stay is equipped at least in the area of its ends with a stop face. The prism blocks can Form together with the longitudinal stays the one-piecs casting section. however, it is also possible to make the prism blocks separate From the longitudi-nal stays designed as casting sections~ and to at-tach them then rigidly to the longitudinal stays~
e.g. by welding.
Fig. 9 shows a prism block za, which has two exten-sions 17,18 at right angles to one another, of which the extension 17 engages the front end o~ the lon-gitudinal stay 1 and the extension 18 engages the adjacent -~ront side oF the transverse stay 2. Each prism block ZO has a shaped face 19 on its upper part, the shape and position of which are matched to those oF the tensioning edge or of the tension-ing fold of the screen fabric 26. As illus~rated, ..
~O~ S
the prism block 20 is penetrated in the direction of its extension 17 ~y a hole, in which the guide bush 15 is fixed.
Holding-down devices 31 can be provided on the prism blocks 20 in the area of the extension 18~
The shaped face 1~ of the prism block 20 has a positive effect particularly when two or more tenslonincJ devices are arran~ed successively on a screening or sifting machine, as shown in Fig. 4; this arrangementsimplifiæ the tensioning or detensioning of the woven fabric or screen bottom.
The longitudinal or transverse stays 1, 2 as well as the long-itudinal and transverse tie-bars 22, 23 are made preferably of a liyht metal, e.g. aluminium.
Fig. 4 is a cross-section through the two transverse stays of adjacent frames, with a tensioning rail 3 associated to the left-hand stay. The tensioning rall 3, with a mainly C~shaped cross-section, reaches with its free lower leg underneath the holcling-down device 31 which is in the form o~ a roller, and is thereby additionally secured. A wire fabric, Eor example, is attached to the other upper leg of the tensioning rail 3. The riyht-~ hand transverse stay has an S-shaped cross-sectional clesign.
The upper leg fixes thereby a wire fabric, whereas the lower le~ forms a supporting surface. I~he space defined by the lower le~ as well as a mainly perpenclicular and a central stay is e~uippecl towards the screening surface with a stop 32, e.g. a rouncl wire running parallel to the transverse stay and welded at the ends.
The stop 32 prevents the escape of the beating elements, e.g.
beating balls, intro~uced in this space. These beating elements protect the transverse stays against clogging by excessive sedi-mentation. Furthermore, these beating elements can serve also to prevent a pressing down- _ lC~916ZS
D~ the central stay and or the upper leg. Cons2-quently, the upper leg cannot be li~ted by the clamp-ing ~orces acting upon it and resulting frDm the ten-sioning o~ the ~abric or o~ the screen bottom, which `~
makes it pDssible to ensure a reliable ~astening o~
the ~abric or o~ the screen bottom.
Patent cl~ims
Claims (3)
1. A tensioning device for screen fabrics and the like comprising;
(a) a frame having a pair of longitudinally extending frame members arranged in a spaced parallel relationship and connected to one another by transverse frame members which ex-tend therebetween, said frame having first and second ends at opposite ends of said longitudinal frame members, (b) a tensioning bracket slidably mounted on each longitudinal member adjacent said first end of said frame for longitudinal movement with respect to said frame in the direc-tion of the longitudinal extent of said longitudinally extending frame members in a tensioning plane, (c) a tensioning rail extending transversely of said frame and hingedly mounted on each of said tensioning brackets for rotational movement about axes extending perpendicular to said tensioning plane, said tensioning rail being adapted to en-gage one end of a screen fabric to be tensioned in said frame, (d) mounting means at the second end of said frame adapted to engage a second end of said screen, (e) tensioning means cooperating with each tensioning bracket for resiliently urging it towards said first end of said frame whereby said tensioning rail is resiliently urged towards said first end to tension a screen fabric in use.
(a) a frame having a pair of longitudinally extending frame members arranged in a spaced parallel relationship and connected to one another by transverse frame members which ex-tend therebetween, said frame having first and second ends at opposite ends of said longitudinal frame members, (b) a tensioning bracket slidably mounted on each longitudinal member adjacent said first end of said frame for longitudinal movement with respect to said frame in the direc-tion of the longitudinal extent of said longitudinally extending frame members in a tensioning plane, (c) a tensioning rail extending transversely of said frame and hingedly mounted on each of said tensioning brackets for rotational movement about axes extending perpendicular to said tensioning plane, said tensioning rail being adapted to en-gage one end of a screen fabric to be tensioned in said frame, (d) mounting means at the second end of said frame adapted to engage a second end of said screen, (e) tensioning means cooperating with each tensioning bracket for resiliently urging it towards said first end of said frame whereby said tensioning rail is resiliently urged towards said first end to tension a screen fabric in use.
2. A tensioning device as claimed in Claim 1 wherein said mounting means at said second end of said frame comprises, (a) a second tensioning bracket slidably mounted on each longitudinally extending frame member adjacent said second end of said frame for longitudinal movement with respect to its associated longitudinal frame member in the direction of the longitudinal extent of said longitudinally extending frame members in said tensioning plane, (b) a second tensioning rail extending transversely between and hingedly mounted on said second tensioning brackets for rotational movement about axes extending perpendicular to said tensioning plane, said second tensioning rail being adapted to engage said second end of said screen fabric.
3. A tensioning device as claimed in Claim 2 wherein said tensioning means is adjustable to vary the tensioning load applied to the tensioning rail as required in use.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2634935.9 | 1976-08-04 | ||
| DE19762634935 DE2634935C2 (en) | 1976-08-04 | 1976-08-04 | Tenter frames for tensioning fabrics for the purpose of sieving, sifting and filtering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1091625A true CA1091625A (en) | 1980-12-16 |
Family
ID=5984644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA271,782A Expired CA1091625A (en) | 1976-08-04 | 1977-02-10 | Clamping and tensioning means for loomed devices |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1091625A (en) |
| DE (1) | DE2634935C2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252653A (en) * | 2019-07-16 | 2019-09-20 | 山鹰国际控股股份公司 | A kind of sieve replacement tool |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106733631A (en) * | 2016-12-02 | 2017-05-31 | 新乡市振英机械设备有限公司 | Adjustable screen supporting device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1314964A (en) * | 1962-02-15 | 1963-01-11 | Parker Ltd Frederick | Improvements to devices for sieving solid materials |
| DE1225950B (en) * | 1965-09-08 | 1966-09-29 | Siteg Siebtech Gmbh | Clamping device for screen mesh in cross tensioners |
| DE1940889A1 (en) * | 1969-08-12 | 1971-03-04 | Kurt Tietz | Quick-action clamping device for screen - apparatus |
-
1976
- 1976-08-04 DE DE19762634935 patent/DE2634935C2/en not_active Expired
-
1977
- 1977-02-10 CA CA271,782A patent/CA1091625A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252653A (en) * | 2019-07-16 | 2019-09-20 | 山鹰国际控股股份公司 | A kind of sieve replacement tool |
| CN110252653B (en) * | 2019-07-16 | 2024-01-09 | 山鹰国际控股股份公司 | Screen cloth replacement tool |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2634935C2 (en) | 1983-03-31 |
| DE2634935A1 (en) | 1978-02-09 |
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| MKEX | Expiry |