CA2028005A1 - Protective cover for use in a plastic processing machine - Google Patents
Protective cover for use in a plastic processing machineInfo
- Publication number
- CA2028005A1 CA2028005A1 CA 2028005 CA2028005A CA2028005A1 CA 2028005 A1 CA2028005 A1 CA 2028005A1 CA 2028005 CA2028005 CA 2028005 CA 2028005 A CA2028005 A CA 2028005A CA 2028005 A1 CA2028005 A1 CA 2028005A1
- Authority
- CA
- Canada
- Prior art keywords
- pane
- frame body
- marginal portion
- set forth
- protective cover
- 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
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/84—Safety devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/1214—Anchoring by foaming into a preformed part, e.g. by penetrating through holes
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Securing Of Glass Panes Or The Like (AREA)
Abstract
PROTECTIVE COVER FOR USE ON A PLASTIC
PROCESSING MACHINE
A transparent pane of the protective cover is urged by a resilient biasing member of foamed plas-tic against a frame body of the cover. ?n that side of said pane which is opposite to the frame body the bias-ing member is backed by finlike abutment means joined to the frame body. As a result, the manufacture of the protective cover can be automated to a higher degree and involves only a relatively small amount of manual assembling work and the protective cover will be highly unsusceptible to shakes and vibration occurring in the operation of the machine even when it has a long service life.
PROCESSING MACHINE
A transparent pane of the protective cover is urged by a resilient biasing member of foamed plas-tic against a frame body of the cover. ?n that side of said pane which is opposite to the frame body the bias-ing member is backed by finlike abutment means joined to the frame body. As a result, the manufacture of the protective cover can be automated to a higher degree and involves only a relatively small amount of manual assembling work and the protective cover will be highly unsusceptible to shakes and vibration occurring in the operation of the machine even when it has a long service life.
Description
^ 2~2~0~
~C~GXC~ 3 0~ liTION
Field of -the Invention ~ his invention relates to a sro-tective cover which is intended to be used on a pl-stic processing machine and is liable to ~e subjected to recurrent shakes and vibr~tion in the operation of such m1chine. The protective cover is intended to shield hazardous regions of such machine and com-prises a frame, a transparent pane, which CoDsists of a polymeric material and is held on said frame, and at least one resilient biasing member, which cons!ists of polymeric material and bears at least on portions of the marginal portions of said pane under compres-sive initial stress so as to hold the pane on the frameO
~ ' "
Description of the ~rior Art .
Protective covers of that kind are subjected in operation to periodic shakes and to ~-vibration, which are due to the periodic stoppages of moving parts of the machine, e. g., in an injection molding machine to the opening and closing of the in~
jection mold or to the movement of the plasticizing cylinder into and out of engagement with the injection -2- ~
: ';
2~2~5 mold durin~ the injection molding cycles. For this reason the means for holding the pane and the pane -itself will be subjected in the knol~n protective covers to strong recurrent loads during the operation of a machine for many years and said recurrent loads may .,,:, ....
cause the pane to become loose or 'o crack or even ~' break as a ~esult of a ~atigue of the material. ~' In a kno~.~n protective cover of '-the kind de~cribed, the transparent pane is mounted '",~
., . . -, .
lO on the frame by means of a flexible strip, which is ' -made of a highly polymeric material and is supported ' -' ' on the frame and engages the pe~ipheral edge of,the ' ,',,,~
transparent plate. The strip is approximately circu- ' '' ,-. :,:,.
lar in cross-section and is formed with two diametri-15 cally opposite longitudinal grooves. I~ihen the pane ',~ ' ... .
has been mounted, a sheet metal edge of the frame ' '' extends into one longitudinal ~roove and the edge of the pane extends into the diametrically opposite other longitudinal groove. A filler bar extends into an 20 additional longitudi~al groove of the strip and forces ,,~
the side faces of the diametrically opposite longitu- '~, ,;
dinal grooves against the sheet metal edge of the ~ ~
frame and the edge of the pane under initial stress~ ''''`,', (Sae catalog GHE - Klemmprofile - Glazing Sectio~s - -'-'~-K 52/4-1/1 84)o A high skill and substantial phy-sical forces are required for the mounting of the pane ~ ~`
.:
., ';
., ,, ; ~l and the strip iD ~he frame and that operat on can be performed only by means of special tools. The strip is initially mounted on the vertical sheet metal edge of the frame of the protective cover and 5 only thereafter is the pane inserted by means of an ;~
appropriate tool into the associated longitudinal groove and is temporarily hig~ly deformed during that operation. Even when this assembling operatian is performed by skilled labor, the pane will be subject- -ed to high stresses even after it has thus been assemb-led so that the breaking strength of the pane will highly be decreased. S~ch stresses may æise only in portions of the pane because the frictional forces which are exerted are so strong that 2here will be no 15 equalization of stresses by a relative movement bet- `;
ween the strlp and the tran9parent plate.
It is apparent from the above that the insertion of the pane into the frame and ;
the fixation of said pane can be automated only to 20 a low degree and that pane that isheld by means ~of a `~
flexible strip in the manner described hereinbefore can be removed from the frame if the strip is care~
fully extracted and the pane can subsequen'~ly be re~
.
inserted in such a manner that such operation cannot be detected thereafter. As a result, an unauthorized and undetectable intrusion into critical and hazardous .' ~: ;''.''' tT
i~--` ,' . . ''- ~,'', zones of the machine ma~T be performed and this may ~-~
constitute ~ severe disadvantage for the manufacturer of the injection ~olaing machine if ~n oper_tor of t'ne machine claims an unjustified comp~nsation for d_m.i~ge after an accident.
'~IT~-re relavively lar,e and heavv~
~ransparent panes are emplo~ied, the `-iasing strip ' ,-~us~ be made of a relativel~ r.arl ma~erial, the '~, ',' el,asticity of which may decrease ~nd w~lich may ern- -', 10 brit.le in the cours- of time. ~-: .
~um~ary o~ the Invention ~ or this re _cn it is an object of the invention to provide a proteotive cover which is of the kind described first hereinbefore arid is,';~
15 so designed ~hat its manufacture can be automated ~ ~' to a high degree and involves only a rela~ively small -- ', amount of manual assembling work and rlich is highly unsusceptible to shakes and vibration even after the machine has be*n operated for a long timeO ;' It is ano~her object of the '~' invention to provide such a pro~ective cover in which ' , ,, , , the bransparent pane cannot non-detectably be remove'd ,' from and re-lnserted into the frameO
In ~I pro-~ective cover of the ' ~' Xind described iirst hereinbefore sâid objects are . :.: -2~2~0~
,~ . , ~c_o~llished in accordarce fJitn the in-ention in t~t tn- biasing memDer consists of a ;~lastic ioa~ea in situ and is sup~orted on t~ rear on abutmer.t means which are joined to the body of the frame and that the mar~inal ~ortion of the transparent ,ane is urged by the pressure applied by said biasing member against a broadside surface ol the frame body.
~egardless of their size and ,~ieight, such protective covers will resist shakes and vibration even durin~ an intense operation of the associated machine for a long time. In case of need, transparent panes i.~ay be used which are lighter in weight and less expensive because they are less highly stressed when they are mounted in accordance ~ ~;
with the invention. The manual assembling work which is required is substantially restricted to the inser~
tion or the transparent pane into gaps of the frame, which may be manufactured substantially automatically by blanking and shaping or by injection molding. ~he ;
20 material~for making the highly elastic biasing member ;~;
for retainlng the transparent pane mayOalso be intro-duced in an automatic step. For instance, a robot optionally moving along a suitable track may beiused to ap~ly a foamable plastic composition between the frame and the transparent pane preferably when they have a horizontal orientation and the plastic composi-tion may subsequently be caused or permitted to expandO
. :. ~ ::~- ~
~ -6~
Suitable foamable P1G~ tiC c5mrosi~
tions are -lva~lable on the ma~ket in a large variety ~ -~
~!e~ers ~,e,~ilon ~i~r ~ r;ik ~nd der exakten I~atur-wissenschaften, 3ibliogr. Institut l~annheim/JLeDn Zuric~, r1a.lnheim 1~70, ~Jolume 3, 0-Z, page 2254).
Foamabie lastics compositions which exhibit crly a relatively small expansion as the~ are r'~?aC~' d have ~ -proved particu]arl~ satisfactory. This is particul,lrly ~;
applicable to foamable polyurethane plastics in which the terminal isocyanate group is capable of reacting with water with a release of carbon dioxide serving as an expanding gas. In that case the biasing members may be made to have the required elasticity for a damping of vibration and to have the required strength --~
and to preserve said properties during an operation for an almost unlimited time, as has been s..own by experiments. ~ ;
~ . , ;
Brief Description of the Drawing Figure 1 is a perspective view showing a slidable protective cover provided on an injection ; I molding machine. ;~
Figure 2 is an enlarged fragmentary transverse sectional view showing a portion o~` th~
protective COVel' of ~igure 1 adjacent to the bottom frame bar before the introduction of the resilient 2 0 2 ~ O ~ 3 ,, ~
frame bar before the introductîon of the resilient biasing memberO
~ igures 3 and 4 are a fragme~tary rear elevation and a top plan view, respectively, 5 showing the same portion as Figure 2.
Figures 5 to 7 are views which are similar to Figures 2 to 4 and show a modified protec~
tive coverO -~
~ igure 8 is a sectlonal view taken on 10 line VIII-VIII in ~igure 9.
Figure 8a shows a modifiction of ~igure ~
Figure 9 is an enlarged fragmentary -view which i5 si~ilar to Figure ~ and shows a p rtion ;~ -15 of the the complete protective coverO .-- . - . . -:~ Figure 10 is a sectional view taken on line X-X in iigu~e 90 ;~
Detailed Description of the Preferred hmbodiments Embodlments of the invention wlll now 20 be~described. ~ -: ,, .~ .. .. .
In the embodiments shown on the drawing .~
the protective cover is incorporated in an injection : ~-molding machineO Owing to its robustness the protective .~
- cover is generall~ usable with shaping and processing . ;.
25 machines which are subjected to rhythmic shakes and ~: . 8 ;~
. . .
': ',.,`; .
2 ~ 2 ~ J ~Ij m_chines which are subjected to rhyt ic shakes and vibration in opera-ion an~ which are likely to be subjected to shocks and impacts particu~lvY during their exportation to d.eveloping countries.
~he injection mol~ing ~achine shown in ~igure l is provided with slidable prot,ective covers which in their protecting position adjcin a ceDtral sta i~nar~V/ supporting column 19 and which are slidable from their protectinG positiorl ~o tne l0 left and right, respectivelyO The slidable protective . ~:
covers are provided as accident-preventing gusrds :-over hazardous portions of the machin~, such as the . ~.
region U1 which contains the ~old clam?ing space oi the clamping unit and the region U2 whicn accommo- -15 dates the plasticizing cylinder of the injectin~ ~-unit, and yet permit a con'l~u^us visual inspection :
of said regions~
As is apparent from the drawings the :
protective cover comprises a rectangular frame body ~ ;~
l0 and a transparent pane ll, which consists o~
polymeric material and is held on said frame body.
~he frame body l0 is made from a sheet steel blank ! ! to have an edge flange l0a~ which has be~n bent at right angles. ~he marginal portion of the transparent pane ll is subjected to the pressure applied by at least one resilient biasing member 18, which has been _~_ 2~2~
., bent at right angl.es. ~he marginal portion of the transparen~ pane 11 is subjected to the pressure ap~lied by at least one resilient biasing member 18, which h~s been made of foamed plastic, and 5 under said pressure is urged against a broadside ~:
surface of the frame body 10. On that side of the transparent pane 11 which is op:osite to the frame -~
body 10 the biasing member 18 bears on abutment ~ :~
means, which are Joined to the frame body 10, as 10 is particularly apparent from Figures 8 to 10. The ;~
biasing member 18 consists of a polyurethane foam, : .:
which has been foamed in situ between the abutment means and the adjacent surface of the transparent pane 11 in such a manner that the resulting resilient biasing member 18 is in contact under a compressive initial stress with the margiDal portion of the transparent pane 11 on the brD.adside and on the edge .
. ~ . .
surface lla thereof and on the adjacent portion of .
~ the broadside surface of the frame body 10. ~he che~
: 20 mical reactions by which the expanding gas is evolved will not be initiated unless the reactable components ; ': -~ ~ , of the starting composition have left the nozzle of l the applicator, which is moved by the robot, and said .-~
-~ components have been mixed. As the biasing member 18 ..
is formed, it is being e~panded and is thus pe~ma~
nently biased at right angles to the plane of the -1O- '``'^.:~
.:
--~ 2 0 2 ~ ~ 6V ~;
transparent pane 11. In the illustrated embodiments -the resilient biasing member 18 is constituted by a strip, which has an approximately uniform cross-sectional shape and which extends linearly along the edge of and overlaps the marginal portion of the pane.
When the biasing member 18 has been formed, it will adhesively be bonded to the frame body 10 and to the edge face lla and the broadside surface of the pane 11 in those areas which are contacted by ~e mem-ber 18. ~he finlike abutment flanges 13a, 14a areformed with longitudinally aligned apertures 16, 15, which overlie the pane 11 and the frame body 10 so that the foamable composition flowing through said apertures will be bonded to the braodside and the edge ;;~
surface lla of the marginal portion of the pane 11 and the adjacent portion of the frame body. In the;~
embodiment shown on the drawing the abutments are constituted by abutment flanges l~a, 14a of section bars 13 and 14, which are welded to the metal frame body 10 on that side which is contacted by the pane llo The vertic~ section bars 13 are constituted by angled metal strips and the horizontal section bars 14 by;
"~ i I angle bars. As is particularly apparent from Figure9 8 and 10 an abutment flange 13a which is parallel to the p~ne of the pane 11 overlaps the marginal portion of the plane 11 and via an oblique intermediate portion ;
merges into the mounting flange 13b, which is welded to --~
'' ~
2 ~
the frame body lOo ~ach of those angle bars v~hich ~ :
constitute the horizontal section bars 14 has in the :~
illustrated embodiment an abutment flange 14a, which :
is parallel to the plane of the pane 11, and a mount-ing flange 14b. ~he spacing of the apertures 16, 15 is so selected that the continuously applied foam-able plastic constitutes a continuous biasing strip, which overlaps the marginal portion of the pane ll o The lower horizontal section bar 14 of the slid~ble .
protective cover is connected to the frame body 10 by a section bar 12, on which switching means are ~:
mounted. The horizontal section bar 14 which is welded .`:~`
to the upper horizontal frame bar is designed like the lower section bar 14 and like the latter is connected ;~
to the frame body 10 by a section bar 12. AS is appa~
rent frOm Figures 4:and 7 each of the apertures 15 in the abutment flange 14a has a portion 15', which ,- ~. . ~ , - .~
slightly extends into the mountin~ flange 14b to ensure that the foamable plastic which is applied will contact also tbe lower horizontal edge surface of the pane:ll. In the illustra~ted embodiment the resilient .-~
biasing member 14 has a pressure-applying portion 18a, ~ -~
which extends between the pane 11 and the frame body - ~:
10 and which by a portion extending through the aper-tures 16, 15 is connected to an anchoring outer portion 18b partly covering the abutment leg 13~ or 14a on the outside.
:''' ' ' `~
, 2~2$~
In the illustrati~e embodiment sh~wn in Figures 2 to 4 the mountin~r flange 14b of the angle bar 14 is readily detachabl~ connected to the section bar 12 by screws,In that case that lower ,ec-5 tion Dar 14 is mounted during the assembling oY r~he ~ -protective cover after the pane 11 has slidably been -inserted from below to the require-l position.
In the modification shown in Figures ~ ~
5 t¢ 7 the horizontally extending angle bar 14 is dis- -posed on one side of the protective cover at such a distance a (Figures 6, 7) from the vertically extend~
ing section bar 13 that the pane 11 can be inserted in a deflected state into gaps between the frame body 10.
Said gaps are Zefined by the abutment ins 13a, 14aO
The slidable inserticn in a lateral direction is indicated by broken lines in Figure 7.
Another embodiment of the finlike vertical abutments l~ and of the associated biasing strip 18 is shown in Figure 8a. In that embodiment the abutment flange 13c of the an~le bar 1~ includes an angle ~ with the plane of the pane 11 and is not formed with apertures and the foamable plastic compo-sition is introduced in the direction of the arrow B under the abutment ~lange 13c during the assembling of the protective cover.
In actually manufactured embodiments, the biasing member 18 was made from a foamable poly- ~
~ ....
urethane comDosition having reactive components which ;~
react to ~elease carbon dioxide as an expanding gas :
as they are discharged from the nozzle of the appli-catcr. ~ -~
A stop 17 provided on the section ~ - -bar lZ (Figures 6 and 9) serves to retain the pane 11 before the biasing members are formed in situ.
:. , .~, , ~'','~ .,~
'~'`'''~
~C~GXC~ 3 0~ liTION
Field of -the Invention ~ his invention relates to a sro-tective cover which is intended to be used on a pl-stic processing machine and is liable to ~e subjected to recurrent shakes and vibr~tion in the operation of such m1chine. The protective cover is intended to shield hazardous regions of such machine and com-prises a frame, a transparent pane, which CoDsists of a polymeric material and is held on said frame, and at least one resilient biasing member, which cons!ists of polymeric material and bears at least on portions of the marginal portions of said pane under compres-sive initial stress so as to hold the pane on the frameO
~ ' "
Description of the ~rior Art .
Protective covers of that kind are subjected in operation to periodic shakes and to ~-vibration, which are due to the periodic stoppages of moving parts of the machine, e. g., in an injection molding machine to the opening and closing of the in~
jection mold or to the movement of the plasticizing cylinder into and out of engagement with the injection -2- ~
: ';
2~2~5 mold durin~ the injection molding cycles. For this reason the means for holding the pane and the pane -itself will be subjected in the knol~n protective covers to strong recurrent loads during the operation of a machine for many years and said recurrent loads may .,,:, ....
cause the pane to become loose or 'o crack or even ~' break as a ~esult of a ~atigue of the material. ~' In a kno~.~n protective cover of '-the kind de~cribed, the transparent pane is mounted '",~
., . . -, .
lO on the frame by means of a flexible strip, which is ' -made of a highly polymeric material and is supported ' -' ' on the frame and engages the pe~ipheral edge of,the ' ,',,,~
transparent plate. The strip is approximately circu- ' '' ,-. :,:,.
lar in cross-section and is formed with two diametri-15 cally opposite longitudinal grooves. I~ihen the pane ',~ ' ... .
has been mounted, a sheet metal edge of the frame ' '' extends into one longitudinal ~roove and the edge of the pane extends into the diametrically opposite other longitudinal groove. A filler bar extends into an 20 additional longitudi~al groove of the strip and forces ,,~
the side faces of the diametrically opposite longitu- '~, ,;
dinal grooves against the sheet metal edge of the ~ ~
frame and the edge of the pane under initial stress~ ''''`,', (Sae catalog GHE - Klemmprofile - Glazing Sectio~s - -'-'~-K 52/4-1/1 84)o A high skill and substantial phy-sical forces are required for the mounting of the pane ~ ~`
.:
., ';
., ,, ; ~l and the strip iD ~he frame and that operat on can be performed only by means of special tools. The strip is initially mounted on the vertical sheet metal edge of the frame of the protective cover and 5 only thereafter is the pane inserted by means of an ;~
appropriate tool into the associated longitudinal groove and is temporarily hig~ly deformed during that operation. Even when this assembling operatian is performed by skilled labor, the pane will be subject- -ed to high stresses even after it has thus been assemb-led so that the breaking strength of the pane will highly be decreased. S~ch stresses may æise only in portions of the pane because the frictional forces which are exerted are so strong that 2here will be no 15 equalization of stresses by a relative movement bet- `;
ween the strlp and the tran9parent plate.
It is apparent from the above that the insertion of the pane into the frame and ;
the fixation of said pane can be automated only to 20 a low degree and that pane that isheld by means ~of a `~
flexible strip in the manner described hereinbefore can be removed from the frame if the strip is care~
fully extracted and the pane can subsequen'~ly be re~
.
inserted in such a manner that such operation cannot be detected thereafter. As a result, an unauthorized and undetectable intrusion into critical and hazardous .' ~: ;''.''' tT
i~--` ,' . . ''- ~,'', zones of the machine ma~T be performed and this may ~-~
constitute ~ severe disadvantage for the manufacturer of the injection ~olaing machine if ~n oper_tor of t'ne machine claims an unjustified comp~nsation for d_m.i~ge after an accident.
'~IT~-re relavively lar,e and heavv~
~ransparent panes are emplo~ied, the `-iasing strip ' ,-~us~ be made of a relativel~ r.arl ma~erial, the '~, ',' el,asticity of which may decrease ~nd w~lich may ern- -', 10 brit.le in the cours- of time. ~-: .
~um~ary o~ the Invention ~ or this re _cn it is an object of the invention to provide a proteotive cover which is of the kind described first hereinbefore arid is,';~
15 so designed ~hat its manufacture can be automated ~ ~' to a high degree and involves only a rela~ively small -- ', amount of manual assembling work and rlich is highly unsusceptible to shakes and vibration even after the machine has be*n operated for a long timeO ;' It is ano~her object of the '~' invention to provide such a pro~ective cover in which ' , ,, , , the bransparent pane cannot non-detectably be remove'd ,' from and re-lnserted into the frameO
In ~I pro-~ective cover of the ' ~' Xind described iirst hereinbefore sâid objects are . :.: -2~2~0~
,~ . , ~c_o~llished in accordarce fJitn the in-ention in t~t tn- biasing memDer consists of a ;~lastic ioa~ea in situ and is sup~orted on t~ rear on abutmer.t means which are joined to the body of the frame and that the mar~inal ~ortion of the transparent ,ane is urged by the pressure applied by said biasing member against a broadside surface ol the frame body.
~egardless of their size and ,~ieight, such protective covers will resist shakes and vibration even durin~ an intense operation of the associated machine for a long time. In case of need, transparent panes i.~ay be used which are lighter in weight and less expensive because they are less highly stressed when they are mounted in accordance ~ ~;
with the invention. The manual assembling work which is required is substantially restricted to the inser~
tion or the transparent pane into gaps of the frame, which may be manufactured substantially automatically by blanking and shaping or by injection molding. ~he ;
20 material~for making the highly elastic biasing member ;~;
for retainlng the transparent pane mayOalso be intro-duced in an automatic step. For instance, a robot optionally moving along a suitable track may beiused to ap~ly a foamable plastic composition between the frame and the transparent pane preferably when they have a horizontal orientation and the plastic composi-tion may subsequently be caused or permitted to expandO
. :. ~ ::~- ~
~ -6~
Suitable foamable P1G~ tiC c5mrosi~
tions are -lva~lable on the ma~ket in a large variety ~ -~
~!e~ers ~,e,~ilon ~i~r ~ r;ik ~nd der exakten I~atur-wissenschaften, 3ibliogr. Institut l~annheim/JLeDn Zuric~, r1a.lnheim 1~70, ~Jolume 3, 0-Z, page 2254).
Foamabie lastics compositions which exhibit crly a relatively small expansion as the~ are r'~?aC~' d have ~ -proved particu]arl~ satisfactory. This is particul,lrly ~;
applicable to foamable polyurethane plastics in which the terminal isocyanate group is capable of reacting with water with a release of carbon dioxide serving as an expanding gas. In that case the biasing members may be made to have the required elasticity for a damping of vibration and to have the required strength --~
and to preserve said properties during an operation for an almost unlimited time, as has been s..own by experiments. ~ ;
~ . , ;
Brief Description of the Drawing Figure 1 is a perspective view showing a slidable protective cover provided on an injection ; I molding machine. ;~
Figure 2 is an enlarged fragmentary transverse sectional view showing a portion o~` th~
protective COVel' of ~igure 1 adjacent to the bottom frame bar before the introduction of the resilient 2 0 2 ~ O ~ 3 ,, ~
frame bar before the introductîon of the resilient biasing memberO
~ igures 3 and 4 are a fragme~tary rear elevation and a top plan view, respectively, 5 showing the same portion as Figure 2.
Figures 5 to 7 are views which are similar to Figures 2 to 4 and show a modified protec~
tive coverO -~
~ igure 8 is a sectlonal view taken on 10 line VIII-VIII in ~igure 9.
Figure 8a shows a modifiction of ~igure ~
Figure 9 is an enlarged fragmentary -view which i5 si~ilar to Figure ~ and shows a p rtion ;~ -15 of the the complete protective coverO .-- . - . . -:~ Figure 10 is a sectional view taken on line X-X in iigu~e 90 ;~
Detailed Description of the Preferred hmbodiments Embodlments of the invention wlll now 20 be~described. ~ -: ,, .~ .. .. .
In the embodiments shown on the drawing .~
the protective cover is incorporated in an injection : ~-molding machineO Owing to its robustness the protective .~
- cover is generall~ usable with shaping and processing . ;.
25 machines which are subjected to rhythmic shakes and ~: . 8 ;~
. . .
': ',.,`; .
2 ~ 2 ~ J ~Ij m_chines which are subjected to rhyt ic shakes and vibration in opera-ion an~ which are likely to be subjected to shocks and impacts particu~lvY during their exportation to d.eveloping countries.
~he injection mol~ing ~achine shown in ~igure l is provided with slidable prot,ective covers which in their protecting position adjcin a ceDtral sta i~nar~V/ supporting column 19 and which are slidable from their protectinG positiorl ~o tne l0 left and right, respectivelyO The slidable protective . ~:
covers are provided as accident-preventing gusrds :-over hazardous portions of the machin~, such as the . ~.
region U1 which contains the ~old clam?ing space oi the clamping unit and the region U2 whicn accommo- -15 dates the plasticizing cylinder of the injectin~ ~-unit, and yet permit a con'l~u^us visual inspection :
of said regions~
As is apparent from the drawings the :
protective cover comprises a rectangular frame body ~ ;~
l0 and a transparent pane ll, which consists o~
polymeric material and is held on said frame body.
~he frame body l0 is made from a sheet steel blank ! ! to have an edge flange l0a~ which has be~n bent at right angles. ~he marginal portion of the transparent pane ll is subjected to the pressure applied by at least one resilient biasing member 18, which has been _~_ 2~2~
., bent at right angl.es. ~he marginal portion of the transparen~ pane 11 is subjected to the pressure ap~lied by at least one resilient biasing member 18, which h~s been made of foamed plastic, and 5 under said pressure is urged against a broadside ~:
surface of the frame body 10. On that side of the transparent pane 11 which is op:osite to the frame -~
body 10 the biasing member 18 bears on abutment ~ :~
means, which are Joined to the frame body 10, as 10 is particularly apparent from Figures 8 to 10. The ;~
biasing member 18 consists of a polyurethane foam, : .:
which has been foamed in situ between the abutment means and the adjacent surface of the transparent pane 11 in such a manner that the resulting resilient biasing member 18 is in contact under a compressive initial stress with the margiDal portion of the transparent pane 11 on the brD.adside and on the edge .
. ~ . .
surface lla thereof and on the adjacent portion of .
~ the broadside surface of the frame body 10. ~he che~
: 20 mical reactions by which the expanding gas is evolved will not be initiated unless the reactable components ; ': -~ ~ , of the starting composition have left the nozzle of l the applicator, which is moved by the robot, and said .-~
-~ components have been mixed. As the biasing member 18 ..
is formed, it is being e~panded and is thus pe~ma~
nently biased at right angles to the plane of the -1O- '``'^.:~
.:
--~ 2 0 2 ~ ~ 6V ~;
transparent pane 11. In the illustrated embodiments -the resilient biasing member 18 is constituted by a strip, which has an approximately uniform cross-sectional shape and which extends linearly along the edge of and overlaps the marginal portion of the pane.
When the biasing member 18 has been formed, it will adhesively be bonded to the frame body 10 and to the edge face lla and the broadside surface of the pane 11 in those areas which are contacted by ~e mem-ber 18. ~he finlike abutment flanges 13a, 14a areformed with longitudinally aligned apertures 16, 15, which overlie the pane 11 and the frame body 10 so that the foamable composition flowing through said apertures will be bonded to the braodside and the edge ;;~
surface lla of the marginal portion of the pane 11 and the adjacent portion of the frame body. In the;~
embodiment shown on the drawing the abutments are constituted by abutment flanges l~a, 14a of section bars 13 and 14, which are welded to the metal frame body 10 on that side which is contacted by the pane llo The vertic~ section bars 13 are constituted by angled metal strips and the horizontal section bars 14 by;
"~ i I angle bars. As is particularly apparent from Figure9 8 and 10 an abutment flange 13a which is parallel to the p~ne of the pane 11 overlaps the marginal portion of the plane 11 and via an oblique intermediate portion ;
merges into the mounting flange 13b, which is welded to --~
'' ~
2 ~
the frame body lOo ~ach of those angle bars v~hich ~ :
constitute the horizontal section bars 14 has in the :~
illustrated embodiment an abutment flange 14a, which :
is parallel to the plane of the pane 11, and a mount-ing flange 14b. ~he spacing of the apertures 16, 15 is so selected that the continuously applied foam-able plastic constitutes a continuous biasing strip, which overlaps the marginal portion of the pane ll o The lower horizontal section bar 14 of the slid~ble .
protective cover is connected to the frame body 10 by a section bar 12, on which switching means are ~:
mounted. The horizontal section bar 14 which is welded .`:~`
to the upper horizontal frame bar is designed like the lower section bar 14 and like the latter is connected ;~
to the frame body 10 by a section bar 12. AS is appa~
rent frOm Figures 4:and 7 each of the apertures 15 in the abutment flange 14a has a portion 15', which ,- ~. . ~ , - .~
slightly extends into the mountin~ flange 14b to ensure that the foamable plastic which is applied will contact also tbe lower horizontal edge surface of the pane:ll. In the illustra~ted embodiment the resilient .-~
biasing member 14 has a pressure-applying portion 18a, ~ -~
which extends between the pane 11 and the frame body - ~:
10 and which by a portion extending through the aper-tures 16, 15 is connected to an anchoring outer portion 18b partly covering the abutment leg 13~ or 14a on the outside.
:''' ' ' `~
, 2~2$~
In the illustrati~e embodiment sh~wn in Figures 2 to 4 the mountin~r flange 14b of the angle bar 14 is readily detachabl~ connected to the section bar 12 by screws,In that case that lower ,ec-5 tion Dar 14 is mounted during the assembling oY r~he ~ -protective cover after the pane 11 has slidably been -inserted from below to the require-l position.
In the modification shown in Figures ~ ~
5 t¢ 7 the horizontally extending angle bar 14 is dis- -posed on one side of the protective cover at such a distance a (Figures 6, 7) from the vertically extend~
ing section bar 13 that the pane 11 can be inserted in a deflected state into gaps between the frame body 10.
Said gaps are Zefined by the abutment ins 13a, 14aO
The slidable inserticn in a lateral direction is indicated by broken lines in Figure 7.
Another embodiment of the finlike vertical abutments l~ and of the associated biasing strip 18 is shown in Figure 8a. In that embodiment the abutment flange 13c of the an~le bar 1~ includes an angle ~ with the plane of the pane 11 and is not formed with apertures and the foamable plastic compo-sition is introduced in the direction of the arrow B under the abutment ~lange 13c during the assembling of the protective cover.
In actually manufactured embodiments, the biasing member 18 was made from a foamable poly- ~
~ ....
urethane comDosition having reactive components which ;~
react to ~elease carbon dioxide as an expanding gas :
as they are discharged from the nozzle of the appli-catcr. ~ -~
A stop 17 provided on the section ~ - -bar lZ (Figures 6 and 9) serves to retain the pane 11 before the biasing members are formed in situ.
:. , .~, , ~'','~ .,~
'~'`'''~
Claims (12)
1. In a protective cover which is intended to cover a hazardous portion of a plastic processing machine and is liable to be subjected to recurrent shakes and vibration in the operation of such machine, comprising a frame, a transparent pane, which consists of polymeric material and has a marginal portion, and at least one resilient biasing member, which consists of polymeric material and is mounted on said frame and contacts said marginal port-on of said pane under a compressive initial stress to hold said pane on said frame, the improvement residing in that said frame comprises a frame body having a broadside surface and abutment means spaced from and defining at least one gap with said broadside surface, said marginal portion extends in said gap, and said biasing compressive initial stress in said gap between said pane and said abutment means.
2. The improvement set forth in claim 1, wherein said foamed plastic consists of foamed-in-situ foam that is bonded to said abutment means and to said marginal portion of said pane.
3. The improvement set forth in claim 2, wherein said pane, inclusive of said marginal portion, extends in a plane, and said foamed plastics consists of polyurethane foam made from a composition which is foamable and has been foamed by a reaction resulting only in a relatively small expansion and as a result of said expansion said biasing member is held in said gap under a compressive initial stress acting on said marginal portion in a direction which is normal to said plane.
4. The improvement set forth in claim 1, wherein said marginal portion of said pane has an edge surface and a broadside surface facing said abutment means and said biasing member consists of a strip, which extends along said edge surface and has a substantially uniform shape in cross-section and is in contact with and bonded to said edge surface and said broadside surface of said marginal portion of said pane.
5. The improvement set forth in claim 1, wherein said marginal portion extending in said gap leaves a portion of said broadside surface of said frame body exposed to said abutment means, said abutment means are constituted by abutment flanges of section bars mounted an said frame body and are formed with apertures, each of which overlies said marginal portion of said pane and said exposed portion of said broadside surface of said frame body, and said biasing member contacts said marginal portion of said pane and said exposed portion of said broadside surface of said frame body.
6. The improvement set forth in claim 1, wherein said abutment means are parallel to said marginal portion of said pane and are formed with apertures which overlie said marginal portion of said pane and said biasing member extends through said apertures and on that side of said abutment means which is opposite to said gap.
7. The improvement set forth in claim 1, wherein said abutment means include an acute angle with said marginal portion of said pane.
8. The improvement set forth in claim 1 as applied to a protective cover which is planar and intended to extend on said machine in a vertical plane, wherein said abutment means are constituted by abutment flanges of horizontal and vertical section bars mounted on said frame body and said horizontal section bars are sufficiently spaced from said vertical section bars to permit said pane to be slidably inserted in a de-flected state between said abutment flanges of said horizontal section bars and said frame body during the assembling of said protective cover.
9. The improvement set forth in claim 8, wherein said horizontal section bars are detach-ably joined to said frame body.
10. The improvement set forth in claim 1 as applied to a protective cover which is planar and intended to extend on said machine in a vertical plane, wherein said abutment means are constituted by abutment flanges of horizontal and vertical section bars mounted on said frame body and said horizontal section bars are detachably joined to said frame body.
11. The use of a protective cover as set forth in claim 1 over a hazardous portion of a plastic processing machine and is liable to be subjected to recurrent shakes and vibration in the operation of such machine.
12. The use of a protective cover as set forth in claim 1 over a hazardous portion of an injection molding machine.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3936505.0 | 1989-11-02 | ||
| DE19893936505 DE3936505A1 (en) | 1989-11-02 | 1989-11-02 | PROTECTIVE COVER ON A PLASTIC INJECTION MOLDING MACHINE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2028005A1 true CA2028005A1 (en) | 1991-05-03 |
Family
ID=6392734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2028005 Abandoned CA2028005A1 (en) | 1989-11-02 | 1990-10-18 | Protective cover for use in a plastic processing machine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0425811A3 (en) |
| JP (1) | JPH03159719A (en) |
| CA (1) | CA2028005A1 (en) |
| DE (1) | DE3936505A1 (en) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3263014A (en) * | 1962-09-10 | 1966-07-26 | Excel Corp | Method and apparatus for bedding panels into frames |
| FR1352196A (en) * | 1962-12-19 | 1964-02-14 | Saint Gobain | Processes for fitting and fixing panels |
| US3566542A (en) * | 1969-04-02 | 1971-03-02 | Andersen Corp | Window assembly |
| DE2302922A1 (en) * | 1973-01-22 | 1974-07-25 | John Charles Britton | GLAZING INSERT FOR A DOOR OR WINDOW FRAME |
| DE3234453C1 (en) * | 1982-09-17 | 1983-10-27 | Karl 7298 Loßburg Hehl | Protective shield on a work machine |
| FR2571091B1 (en) * | 1984-10-03 | 1987-08-07 | Etude Realisa Machines Special | PROFILE ALLOWING THE MOUNTING OF PROTECTIVE GLASS ON THE SAFETY GUARDS OF DANGEROUS MACHINES. |
| JPH0678711B2 (en) * | 1987-09-03 | 1994-10-05 | 旭硝子株式会社 | Double glazing |
| JPH01172019A (en) * | 1987-12-22 | 1989-07-06 | Energy Sheerants Ltd | Method of mounting glass |
| DE3744523C1 (en) * | 1987-12-30 | 1989-06-08 | Karl Hehl | Protective cover on a plastic injection molding machine |
-
1989
- 1989-11-02 DE DE19893936505 patent/DE3936505A1/en active Granted
-
1990
- 1990-09-24 EP EP19900118269 patent/EP0425811A3/en not_active Withdrawn
- 1990-10-18 CA CA 2028005 patent/CA2028005A1/en not_active Abandoned
- 1990-10-31 JP JP29220890A patent/JPH03159719A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE3936505A1 (en) | 1991-05-08 |
| EP0425811A2 (en) | 1991-05-08 |
| EP0425811A3 (en) | 1992-01-15 |
| DE3936505C2 (en) | 1992-08-27 |
| JPH03159719A (en) | 1991-07-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |