CA1147535A - Mould particularly for casting hygienic-sanitary apparatus with integral rim of the closed or open type - Google Patents
Mould particularly for casting hygienic-sanitary apparatus with integral rim of the closed or open typeInfo
- Publication number
- CA1147535A CA1147535A CA000366252A CA366252A CA1147535A CA 1147535 A CA1147535 A CA 1147535A CA 000366252 A CA000366252 A CA 000366252A CA 366252 A CA366252 A CA 366252A CA 1147535 A CA1147535 A CA 1147535A
- Authority
- CA
- Canada
- Prior art keywords
- mould
- closed
- casting
- perimetral
- rim
- 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
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
- B28B1/261—Moulds therefor
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
ABSTRACT
The object of the invention relates to a mould for casting hygienic-sanitary apparatus with an open or closed integral rim which comprises a lower mould part and at least two lateral mould parts suitable for being closed on the latter according to a horizontal movement of reciprocal bringing-together and which also provides, in correspondence with the upper ends of the inner surfaces of the two lateral mould parts, coplanar perimetral brackets which project towards the central zone of the mould so that on their lower surfaces there is constituted, during the casting stages, the upper horizontal wall of the integral rim, open or closed, of the article to be cast; the aperture defined by said coplanar perimetral rims being closed by a suitable closure insert, the portion of which that is inserted into the aperture constituting the moulding surface of the vertical inner wall of the open or closed rim.
The object of the invention relates to a mould for casting hygienic-sanitary apparatus with an open or closed integral rim which comprises a lower mould part and at least two lateral mould parts suitable for being closed on the latter according to a horizontal movement of reciprocal bringing-together and which also provides, in correspondence with the upper ends of the inner surfaces of the two lateral mould parts, coplanar perimetral brackets which project towards the central zone of the mould so that on their lower surfaces there is constituted, during the casting stages, the upper horizontal wall of the integral rim, open or closed, of the article to be cast; the aperture defined by said coplanar perimetral rims being closed by a suitable closure insert, the portion of which that is inserted into the aperture constituting the moulding surface of the vertical inner wall of the open or closed rim.
Description
The present invention refers, in a very general way, to a mould for casting hygienic-sanitary apparatus in "vitreous china" and more particularly it concerns a mould for casting articles with integral rim, the latter either closed or open.
For example, such articles can be water closet bowls, bidets or other similar apparatus.
It is noted that these latter are cast in complex moulds which are composed of a series of mould parts that can be assembled one with the other to form a casting cavity in which a ceramic material is introduced in slip form.
Amongst other things there are known casting moulds which comprise a lower mould part suitable for shaping the inner cavity of the pedestal of th.e article to be cast, two side mould parts suitable for being closed on said lower mould part according to a horizontal movement and intended to shape the article externally, and an upper mould part or cover which is intended to be placed on the side mould parts to close the upper opening of the casting cavi.ty defined by the aforesaid lower and side mould parts.
The aforesaid cover, in plaster lik.e the other mould parts comprising the mould, is normally constituted by a flat body whose perimetral edge is supported on the upper faces of the side mould parts wh.ilst from its lower face there projects a sinker which penetrates a certain distance inside the casting cavity of the mould. The lower end of this sinker may be flat or may be provided with a depres~ion generally shaped like a dome, which faces towards the said casting cavity. This lower end in addition is usually covered ~y a thin resinous synthetic layer, impermeable to air, or is constituted by a synthetic insert which is embedded in the plaster of the cover.
In addition, the side wall of the sinker of this latter is spaced by a certain distance from the upper edge of the inner surface of the side mould parts so as to thus constitute~in the -1- ~
11~7535 finished article, with the combination of said upper edges of the side mould parts and lower face of the cover, an integral rim of the open type.
The casting moulds of the above described type, however, although at present widely used, have shown, and still show, the disad~antages that will be briefly listed below.
These latter are practically totally due to the shape of the aforesaid cover and upper edges of the side mould parts.
In fact, because of the fact that the uppex horizontal and inner vertical walls of the rim are intended xespectively to be formed on the lower face of the cover and against the side face of the sinker of this latter, in the course of taking the article out of t~e mould, and more precisely in the course of lifting the cover, in certain cases they cause damage to the rim that has just been cast, in particular in correspondence with the point of contact of its horizontal wall with the wall cast on the side mould parts, with the serious and obvious consequences which result from it.
This obviously is due to the extremely extended face of the cover against which there is cast and attached the rim that is not yet fully hardened and hence not yet sufficiently resistant to the shearing force due to the raising of the cover.
In addition, another disadvantage of the known casting moulds derives from the fact that the surface of the cover, subject to the hydrostatic force of the slip put in hy gravity in the mould, is excessive and so the resultant force which tends to raise the cover, is relatively great and so as to maintain this latter constantly supported against t~e side mould parts it is necessary to prepare vertical clamping devices of the moulds which are suitable for counterbalancing said relatively great forces.
As a direct conse~uence of this, these vertical clamping devices must of necessity be strong, complex and costly, 1~9L7535 taking into account that usually hygienic-sanitary apparatus is cast in correspondence with a casting installation or bench which also comprises fifty or more casting moulds.
Besides, a cover of the type described is extremely clumsy and heavy and hence awkward to lift and to manoeuvre by the operator. The present patent of invention proposes to present and protect a mould for casting hygienic-sanitary apparatus with integral-rim which, within the scope of a simple, functional, rational and extreme.ly reliable constructional solution, finds a remedy for the above disadvantages.
According to the invention the casting mould proposed is of the type comprising a lower mould part, suitable for shaping internally the pedestal of the article to be cast in the mould, two side mould parts suitahle for being closed on said lower mould part according to a horizontal movement of reciprocal bringing-together, and is characterised by the fact that these latter are individually provided, on the top, with a perimentral bracket which projects towards the central zone of the mould and on whose lower face there is formed, during the casting stages, the horizontal upper wall of the integral rim of the articles.
Finally, the above-mentioned brackets are provided on the top with a widened shoulder-like abutment which acts as a seat for a closure insert which, when the mould is a~sembled, closes the aperture defined by said two brackets.
In addition, said closure insert suitable for being inserted a certain distance inside the casting cavity defined by aforesaid side and lower mould parts, is advantageously constituted by a core of light material, for example an expanded synthetic material which is laterally covered with a suitable layer of plaster in which.there is formed the inner wall of the integral rim, this being of the closed or open type.
~he aims and advantages of the invention, together with 5~35 its characteristics and its constructional values will be better clarified and proved more clearly in the light of the detailed description that follows which is made with reference to the Figures in the only sheet of drawings attached which illustrates a particular and preferred form of embodiment, but are given merely by way of non-limitative example.
Figs. 1 and 2 show two vertïcal sections, at right angles to each other, of the upper part of an assembled mould like the invention.
Fig. 3 shows, according to a perspective ~ie~, the same upper part of the mould with the closure însert in the extxacted position.
From the above figures it can be seen that in this there has been shown only the upper part of a plaster mould for casting a ceramic material in sl;p form so as to form hygienic-sanitary apparatus like, for example, water closet bowls, bidets and other similar articles.
From the particular shape of the upper part of the mould in question it is noted also that this is of the type suitable for the casting of hygienic-sanitary apparatus with integral rim. The latter may be of the open type, as can be seen from the attached drawings, but it can also be of the closed type as will be further described.
The invention is composed of a lower mould part, not shown, which is intended to shape the inner zone of the pedestal of the article which is to be cast inside the same mould. This latter in addition comprises two side mould parts 1 , symmetrical with one another, which are constituted from plaster like the lower mould part just mentioned.
These side mould parts 1 are intended to be held on the lower mould part according to a horizontal movement of reciprocal bringing-together so as to shape the outer faces of the corresponding hygienic-sanitary apparatus.
1~9L753S
From the perimetral upper edge of the inner face of each side mould part 1 , see Figs. 1 and 2, there projects a perimetral ~racket 2 which extends a certain distance towards the central ~one of the casting cavity which is defined by the said side mould parts 1 and lower mould part.
The inner edge of the perimetral brackets 2 is slightly flared upwards whilst their upper corner is crossed by a widened shoulder-like abutment 3 .
When the mould is assemhled the two perimetral brackets
For example, such articles can be water closet bowls, bidets or other similar apparatus.
It is noted that these latter are cast in complex moulds which are composed of a series of mould parts that can be assembled one with the other to form a casting cavity in which a ceramic material is introduced in slip form.
Amongst other things there are known casting moulds which comprise a lower mould part suitable for shaping the inner cavity of the pedestal of th.e article to be cast, two side mould parts suitable for being closed on said lower mould part according to a horizontal movement and intended to shape the article externally, and an upper mould part or cover which is intended to be placed on the side mould parts to close the upper opening of the casting cavi.ty defined by the aforesaid lower and side mould parts.
The aforesaid cover, in plaster lik.e the other mould parts comprising the mould, is normally constituted by a flat body whose perimetral edge is supported on the upper faces of the side mould parts wh.ilst from its lower face there projects a sinker which penetrates a certain distance inside the casting cavity of the mould. The lower end of this sinker may be flat or may be provided with a depres~ion generally shaped like a dome, which faces towards the said casting cavity. This lower end in addition is usually covered ~y a thin resinous synthetic layer, impermeable to air, or is constituted by a synthetic insert which is embedded in the plaster of the cover.
In addition, the side wall of the sinker of this latter is spaced by a certain distance from the upper edge of the inner surface of the side mould parts so as to thus constitute~in the -1- ~
11~7535 finished article, with the combination of said upper edges of the side mould parts and lower face of the cover, an integral rim of the open type.
The casting moulds of the above described type, however, although at present widely used, have shown, and still show, the disad~antages that will be briefly listed below.
These latter are practically totally due to the shape of the aforesaid cover and upper edges of the side mould parts.
In fact, because of the fact that the uppex horizontal and inner vertical walls of the rim are intended xespectively to be formed on the lower face of the cover and against the side face of the sinker of this latter, in the course of taking the article out of t~e mould, and more precisely in the course of lifting the cover, in certain cases they cause damage to the rim that has just been cast, in particular in correspondence with the point of contact of its horizontal wall with the wall cast on the side mould parts, with the serious and obvious consequences which result from it.
This obviously is due to the extremely extended face of the cover against which there is cast and attached the rim that is not yet fully hardened and hence not yet sufficiently resistant to the shearing force due to the raising of the cover.
In addition, another disadvantage of the known casting moulds derives from the fact that the surface of the cover, subject to the hydrostatic force of the slip put in hy gravity in the mould, is excessive and so the resultant force which tends to raise the cover, is relatively great and so as to maintain this latter constantly supported against t~e side mould parts it is necessary to prepare vertical clamping devices of the moulds which are suitable for counterbalancing said relatively great forces.
As a direct conse~uence of this, these vertical clamping devices must of necessity be strong, complex and costly, 1~9L7535 taking into account that usually hygienic-sanitary apparatus is cast in correspondence with a casting installation or bench which also comprises fifty or more casting moulds.
Besides, a cover of the type described is extremely clumsy and heavy and hence awkward to lift and to manoeuvre by the operator. The present patent of invention proposes to present and protect a mould for casting hygienic-sanitary apparatus with integral-rim which, within the scope of a simple, functional, rational and extreme.ly reliable constructional solution, finds a remedy for the above disadvantages.
According to the invention the casting mould proposed is of the type comprising a lower mould part, suitable for shaping internally the pedestal of the article to be cast in the mould, two side mould parts suitahle for being closed on said lower mould part according to a horizontal movement of reciprocal bringing-together, and is characterised by the fact that these latter are individually provided, on the top, with a perimentral bracket which projects towards the central zone of the mould and on whose lower face there is formed, during the casting stages, the horizontal upper wall of the integral rim of the articles.
Finally, the above-mentioned brackets are provided on the top with a widened shoulder-like abutment which acts as a seat for a closure insert which, when the mould is a~sembled, closes the aperture defined by said two brackets.
In addition, said closure insert suitable for being inserted a certain distance inside the casting cavity defined by aforesaid side and lower mould parts, is advantageously constituted by a core of light material, for example an expanded synthetic material which is laterally covered with a suitable layer of plaster in which.there is formed the inner wall of the integral rim, this being of the closed or open type.
~he aims and advantages of the invention, together with 5~35 its characteristics and its constructional values will be better clarified and proved more clearly in the light of the detailed description that follows which is made with reference to the Figures in the only sheet of drawings attached which illustrates a particular and preferred form of embodiment, but are given merely by way of non-limitative example.
Figs. 1 and 2 show two vertïcal sections, at right angles to each other, of the upper part of an assembled mould like the invention.
Fig. 3 shows, according to a perspective ~ie~, the same upper part of the mould with the closure însert in the extxacted position.
From the above figures it can be seen that in this there has been shown only the upper part of a plaster mould for casting a ceramic material in sl;p form so as to form hygienic-sanitary apparatus like, for example, water closet bowls, bidets and other similar articles.
From the particular shape of the upper part of the mould in question it is noted also that this is of the type suitable for the casting of hygienic-sanitary apparatus with integral rim. The latter may be of the open type, as can be seen from the attached drawings, but it can also be of the closed type as will be further described.
The invention is composed of a lower mould part, not shown, which is intended to shape the inner zone of the pedestal of the article which is to be cast inside the same mould. This latter in addition comprises two side mould parts 1 , symmetrical with one another, which are constituted from plaster like the lower mould part just mentioned.
These side mould parts 1 are intended to be held on the lower mould part according to a horizontal movement of reciprocal bringing-together so as to shape the outer faces of the corresponding hygienic-sanitary apparatus.
1~9L753S
From the perimetral upper edge of the inner face of each side mould part 1 , see Figs. 1 and 2, there projects a perimetral ~racket 2 which extends a certain distance towards the central ~one of the casting cavity which is defined by the said side mould parts 1 and lower mould part.
The inner edge of the perimetral brackets 2 is slightly flared upwards whilst their upper corner is crossed by a widened shoulder-like abutment 3 .
When the mould is assemhled the two perimetral brackets
2 define an aperture 66 which is closed by means of a closure insert 4 .
According to a plan view, the closure insert 4 has a generally oval shape which matches exactly the aperture 66 above mentioned.
The closure insert 4 comprises a central core 5 in light material like, for example, a synthetic expanded material whose upper part is surrounded by a suitable easing depression which in its turn is transverseIy provided with a stiffening flange 98 .
The side wall of the synthetlc core 5 is covered with a suitable thickness in plaster 7 , the outer face of which has an incline which is substantially coincident with the incline of the inner edge of the psrimetral brackets 2 .
This layer of plaster 7 is provided at the top and peripherally with a lip 6 which is suitahle for contacting the widened shoulder-like abutment :3 of the brackets 2 when the mould is assembled. In add;tion the lower face of the synthetic core 5 is constituted by a concave depression 8 , generally dome-shaped, the concavity of which is turned towards the casting cavity where the hygienic-sanitary apparatus is to be cast.
Obviously the synthetic material which comprises the core 5 can by a synthetic material impermeable to air or can also be a material that is permeable to air, which is covered, ~1~7535 at least in correspondence with the surface of the dome 8 , with a suitable resinous synthetic layer, impermeable to air.
In the course of use of the casting mould in question, on the lower mould part of the mould there are assembled, by means of a horizontal movement of reciprocal bringing-together, the two side mould parts 1 which are successively clamped in the lateral or horizontal direction.
Consequently, in the aperture 66 which defined the upper opening of the casting cavity in the mould, there is inserted the closure insert 4 which is then pressed against the brackets 2 by means of a vertical clamping device.
This latter, as clearly shown in the enclosures figures, is composed of a metallic arm 96 which at one end is hinged to a small piller 94 . At the opposite end the arm 96 is provided with a seat 86 for hooking a ~econd small pillar ~92 , this latter with an enlarged head. The pillars 94 and ~2 project from the upper faces of the side mould parts 1 and are symmet-rically disposed either relatively to the vertical dlviding plane of these latter or with respect to a vertical plane which is at right angles to said div;ding plane. Finally, the arm 96 is provided with two threaded gripping pins 82 , individually provided with an upper actuation crosspiece, the lower ends of which, intended to act on the flange ,98 , have pressure plates.
At this point the mould is ready for casting and, through a suitable channel which normally is provided in correspondence with the lower mould part of the mould, inside the casting cavity defined by the mould parts which constitute the mould, some slip is introduced by gravity. This latter rises upwards inside the aforementioned casting cavity, displacing the air present in it which leaves through normal vents whic~ are in correspondence with the common separation plane of the side mould parts.
It will certainly be noted that the closure insert 4 ~1~7S35 extends inside the casting cavity for a certain distance the slip continues to rise until it reaches the lower end of the closure insert 4 .
At this point it is necessary to state, even if not mentioned before, that the lower opening of the dome 8 is slightly inclined, for which reason, during the aforesaid casting stages, the casting mould is disposed with an incline suitable for positioning horizontally the aforementioned opening of the dome 8 .
When the ceramic material in slip form arrives in corres-pondence with the above mentioned opening it continues to rise, completely filling the annular cham~er which is compressed between the closure insert 4 and the upper ends of the inner suxfaces of the side mould parts 1 . In this way the mould is completely filled with slip with the exception of almost the whole of the dome 8 where there is trapped a certain quantity of air which i8 at the same pressure as the hydrostatic charge of the slip coming from a conventional and overlying supply tank.
More precisely, since the air is a compressible fluid, the free surface of the slip which is placed in front of the dome 8~ also affects for a short perimetral distance the surface of the dome 8 , said short distance being a function of the hydrostatic charge of the slip.
The mould thus filled is left to rest for a specific period of casting during which, on the mould parts which con-stitute the mould, there are formed the walls of the article since the plaster which constitutes the aforesaid mould parts absorbs the moisture of the slip.
More precisely, in correspondence with the annular chamber which is defined by the closure insert 4 and ~y the upper ends of the side mould parts 1 there is formed the integral rim, of the open type, of the corresponding article.
Besides, the closure insert 4 is intended to define the aperture of the bowl of said article.
In fact, in correspondence with the upper perimetral edge of the inner surfaces of the side mould parts 1 there is formed the outer wall of said open integral rim whilst, on the other hand, respectively in correspondence with the outer surface of the plaster rillg 7, there are formed the upper horizontal wall and the inner wall of said open integral rim.
After the above speci.fied period of casting has passed, through the same aperture for casting there is effected the drainage of the mould which may occur simply by gravity or can be actuated also by using compressed air which is inserted in the upper zone of the mould in known ways, this latter type of drainage being particularly advantageous for accelerating drainage and for preventing possible whirlpool effects wh.ich are extremely damaging for the walls that have just been cast.
At a certai.n point in thi.s drainage the free or level surface of the slip bath present inside the casting cavity of the mould completely frees the lower opening of the dome .8 and substantially at this point the drainage operation is stopped for a certain time to let the closure insert 4 drip and to prevent this dripping from damaging the integrity of the bowl of the article just cast.
Hardly has this dripping stopped than the drainage operation is brought to an end and then one proceeds to take out the article from the mould. This final drainage can be brought to an end by removing the closure insert from the side mould parts.
As a result of the full descri.ptive relationship given previously one will certainly note great advantages made available by a mould thus equipped but, so as to avoid wrong interpretations or useless obscurities, said advantages will be briefly listed as follows. A first major advantage is due to the fact that with a mould thus shaped it is practi.cally impossible, during the 11~753~
extraction of the closure insert 4 , to damage the integral rim of the article since the inner wall of said rim is supported against the lower face of the perimetral brackets 2 .
Another great advantage is due to the fact that hydro-static pressue due to the liquid charge of the slip during the casting stages is not discharged completely on the closure insert 4 but a great part of it i5 supported ~y the ~rackets 2 which are monolithic with the side mould parts 1 .
For this reason, in correspondence with a casting installation or bench, it is possi~le to prepare ver~ical clamping devices much less sturdy, less complicated and hence less costly than those known, for example of the type shown in the enclosed figures.
Further, thanks to the lightness of a closure insert 4 thus constituted, the operators are greatly helped and the manipulations of the closure inserts 4 are made less heavy and this also in relation to their inconvenience which is relatively contained with respect to the known prior art.
Finally, the presence of the dome 8 is extremely advantageous since during the casting stages only a small edge which is close to its mouth is wetted by the slip so that the cleaning operations of said dome that are necessary before proceeding to a subsequent casting stage, are considerably ~implified.
However, it is not necessary that the invention provides a closure insert 4 provided on the ahove-mentioned dome 8 .
In fact, for example, a mould thus constituted is just as efficient for the casting of hygienic-sanitary apparatus with integral closed rim.
For this purpose it is sufficient with the invention to provide an upper mould part known per se which comprises a flat annular body suitable for being placed on the side mould parts 1 , a projection which projects centrally from the lower zone of said _ g _ ~47535 flat annular body to close the aperture 66 and a removable collar, placed laterally of the area of attachment of said projection to the flat annular body, which is composed of a seri.es of separate plaster parts which are individually generally like a wedge or a tooth.
During the casting stages the aforementioned removable collar is supported by suitable coupling means which are put on the lower face of the flat annular body of the upper mould part of the mould.
In this above-described case there is provided, on the projection of the upper mould part, a seat suitable for receiving the correct positioning of the remova~le collar, the upper.flat surface of which, as is know, is intendedl during the casting stages, to form the lower horizontal wall of a closed integral rim.
Qbviously for the æame reasons gi.ven above in this specific case also, i.e. hygi.eni.c-sanitary apparatus with closed integral rim, the upper central zone of the mould is constituted as is shown in the attached figures.
However, it is not necessary for the upper mould part of the mould to comprise a central core .5 covered by a plaster thickness 7 but it can simply be constituted by a full shaped body, in plaster, suita~ly e~uipped to receive the above-mentioned ~emovable collar.
It is understood that the invention is not limited merely to the embodiments descrihed above and that variants and improvements can be brought in without, however, departing from the scope of the invention, the fundamental characteristics of which are summarised in the following claims:
According to a plan view, the closure insert 4 has a generally oval shape which matches exactly the aperture 66 above mentioned.
The closure insert 4 comprises a central core 5 in light material like, for example, a synthetic expanded material whose upper part is surrounded by a suitable easing depression which in its turn is transverseIy provided with a stiffening flange 98 .
The side wall of the synthetlc core 5 is covered with a suitable thickness in plaster 7 , the outer face of which has an incline which is substantially coincident with the incline of the inner edge of the psrimetral brackets 2 .
This layer of plaster 7 is provided at the top and peripherally with a lip 6 which is suitahle for contacting the widened shoulder-like abutment :3 of the brackets 2 when the mould is assembled. In add;tion the lower face of the synthetic core 5 is constituted by a concave depression 8 , generally dome-shaped, the concavity of which is turned towards the casting cavity where the hygienic-sanitary apparatus is to be cast.
Obviously the synthetic material which comprises the core 5 can by a synthetic material impermeable to air or can also be a material that is permeable to air, which is covered, ~1~7535 at least in correspondence with the surface of the dome 8 , with a suitable resinous synthetic layer, impermeable to air.
In the course of use of the casting mould in question, on the lower mould part of the mould there are assembled, by means of a horizontal movement of reciprocal bringing-together, the two side mould parts 1 which are successively clamped in the lateral or horizontal direction.
Consequently, in the aperture 66 which defined the upper opening of the casting cavity in the mould, there is inserted the closure insert 4 which is then pressed against the brackets 2 by means of a vertical clamping device.
This latter, as clearly shown in the enclosures figures, is composed of a metallic arm 96 which at one end is hinged to a small piller 94 . At the opposite end the arm 96 is provided with a seat 86 for hooking a ~econd small pillar ~92 , this latter with an enlarged head. The pillars 94 and ~2 project from the upper faces of the side mould parts 1 and are symmet-rically disposed either relatively to the vertical dlviding plane of these latter or with respect to a vertical plane which is at right angles to said div;ding plane. Finally, the arm 96 is provided with two threaded gripping pins 82 , individually provided with an upper actuation crosspiece, the lower ends of which, intended to act on the flange ,98 , have pressure plates.
At this point the mould is ready for casting and, through a suitable channel which normally is provided in correspondence with the lower mould part of the mould, inside the casting cavity defined by the mould parts which constitute the mould, some slip is introduced by gravity. This latter rises upwards inside the aforementioned casting cavity, displacing the air present in it which leaves through normal vents whic~ are in correspondence with the common separation plane of the side mould parts.
It will certainly be noted that the closure insert 4 ~1~7S35 extends inside the casting cavity for a certain distance the slip continues to rise until it reaches the lower end of the closure insert 4 .
At this point it is necessary to state, even if not mentioned before, that the lower opening of the dome 8 is slightly inclined, for which reason, during the aforesaid casting stages, the casting mould is disposed with an incline suitable for positioning horizontally the aforementioned opening of the dome 8 .
When the ceramic material in slip form arrives in corres-pondence with the above mentioned opening it continues to rise, completely filling the annular cham~er which is compressed between the closure insert 4 and the upper ends of the inner suxfaces of the side mould parts 1 . In this way the mould is completely filled with slip with the exception of almost the whole of the dome 8 where there is trapped a certain quantity of air which i8 at the same pressure as the hydrostatic charge of the slip coming from a conventional and overlying supply tank.
More precisely, since the air is a compressible fluid, the free surface of the slip which is placed in front of the dome 8~ also affects for a short perimetral distance the surface of the dome 8 , said short distance being a function of the hydrostatic charge of the slip.
The mould thus filled is left to rest for a specific period of casting during which, on the mould parts which con-stitute the mould, there are formed the walls of the article since the plaster which constitutes the aforesaid mould parts absorbs the moisture of the slip.
More precisely, in correspondence with the annular chamber which is defined by the closure insert 4 and ~y the upper ends of the side mould parts 1 there is formed the integral rim, of the open type, of the corresponding article.
Besides, the closure insert 4 is intended to define the aperture of the bowl of said article.
In fact, in correspondence with the upper perimetral edge of the inner surfaces of the side mould parts 1 there is formed the outer wall of said open integral rim whilst, on the other hand, respectively in correspondence with the outer surface of the plaster rillg 7, there are formed the upper horizontal wall and the inner wall of said open integral rim.
After the above speci.fied period of casting has passed, through the same aperture for casting there is effected the drainage of the mould which may occur simply by gravity or can be actuated also by using compressed air which is inserted in the upper zone of the mould in known ways, this latter type of drainage being particularly advantageous for accelerating drainage and for preventing possible whirlpool effects wh.ich are extremely damaging for the walls that have just been cast.
At a certai.n point in thi.s drainage the free or level surface of the slip bath present inside the casting cavity of the mould completely frees the lower opening of the dome .8 and substantially at this point the drainage operation is stopped for a certain time to let the closure insert 4 drip and to prevent this dripping from damaging the integrity of the bowl of the article just cast.
Hardly has this dripping stopped than the drainage operation is brought to an end and then one proceeds to take out the article from the mould. This final drainage can be brought to an end by removing the closure insert from the side mould parts.
As a result of the full descri.ptive relationship given previously one will certainly note great advantages made available by a mould thus equipped but, so as to avoid wrong interpretations or useless obscurities, said advantages will be briefly listed as follows. A first major advantage is due to the fact that with a mould thus shaped it is practi.cally impossible, during the 11~753~
extraction of the closure insert 4 , to damage the integral rim of the article since the inner wall of said rim is supported against the lower face of the perimetral brackets 2 .
Another great advantage is due to the fact that hydro-static pressue due to the liquid charge of the slip during the casting stages is not discharged completely on the closure insert 4 but a great part of it i5 supported ~y the ~rackets 2 which are monolithic with the side mould parts 1 .
For this reason, in correspondence with a casting installation or bench, it is possi~le to prepare ver~ical clamping devices much less sturdy, less complicated and hence less costly than those known, for example of the type shown in the enclosed figures.
Further, thanks to the lightness of a closure insert 4 thus constituted, the operators are greatly helped and the manipulations of the closure inserts 4 are made less heavy and this also in relation to their inconvenience which is relatively contained with respect to the known prior art.
Finally, the presence of the dome 8 is extremely advantageous since during the casting stages only a small edge which is close to its mouth is wetted by the slip so that the cleaning operations of said dome that are necessary before proceeding to a subsequent casting stage, are considerably ~implified.
However, it is not necessary that the invention provides a closure insert 4 provided on the ahove-mentioned dome 8 .
In fact, for example, a mould thus constituted is just as efficient for the casting of hygienic-sanitary apparatus with integral closed rim.
For this purpose it is sufficient with the invention to provide an upper mould part known per se which comprises a flat annular body suitable for being placed on the side mould parts 1 , a projection which projects centrally from the lower zone of said _ g _ ~47535 flat annular body to close the aperture 66 and a removable collar, placed laterally of the area of attachment of said projection to the flat annular body, which is composed of a seri.es of separate plaster parts which are individually generally like a wedge or a tooth.
During the casting stages the aforementioned removable collar is supported by suitable coupling means which are put on the lower face of the flat annular body of the upper mould part of the mould.
In this above-described case there is provided, on the projection of the upper mould part, a seat suitable for receiving the correct positioning of the remova~le collar, the upper.flat surface of which, as is know, is intendedl during the casting stages, to form the lower horizontal wall of a closed integral rim.
Qbviously for the æame reasons gi.ven above in this specific case also, i.e. hygi.eni.c-sanitary apparatus with closed integral rim, the upper central zone of the mould is constituted as is shown in the attached figures.
However, it is not necessary for the upper mould part of the mould to comprise a central core .5 covered by a plaster thickness 7 but it can simply be constituted by a full shaped body, in plaster, suita~ly e~uipped to receive the above-mentioned ~emovable collar.
It is understood that the invention is not limited merely to the embodiments descrihed above and that variants and improvements can be brought in without, however, departing from the scope of the invention, the fundamental characteristics of which are summarised in the following claims:
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Mould particularly for the casting of hygienic-sanitary apparatus with open or closed integral rim of the type comprising a lower mould part and at least two side mould parts suitable for being closed on this latter according to a horizontal move-ment of reciprocal bringing-together, characterised by the fact that the aforesaid side mould parts are provided, on top, with two perimetral coplanar brackets which project towards the central zone of the mould so that on their lower faces there is constituted, during the casting stages, the upper horizontal wall of the open or closed integral rim of the article to be cast; the aperture defined by said perimetral coplanar brackets being closed by a suitable closure insert, the portion of which that is inserted into the aperture comprising the moulding surface of the inner vertical wall of the open or closed rim.
2. Mould according to claim 1, characterised by the fact that the inner edge of the said perimetral brackets is slightly flared upwards whilst their inner upper corner is traversed by a widened shoulder-like abutment.
3. Mould according to claim 1, characterised by the fact that said closure insert is composed of a central core in light material like a synthetic material, suitable for penetrating for a certain distance into the casting cavity present in the assembled mould, the side face of which is covered with a suitable layer of plaster which is provided on top with a perimetral lip of conjugate form to that of the widened shoulder-like abutment of said perimetral brackets.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT46804A/80 | 1980-01-22 | ||
| IT46804/80A IT1154052B (en) | 1980-01-22 | 1980-01-22 | MOLD ESPECIALLY FOR THE CASTING OF SANITARY AND SANITARY EQUIPMENT WITH INTEGRAL CLAMP OF THE CLOSED OR OPEN TYPE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1147535A true CA1147535A (en) | 1983-06-07 |
Family
ID=11258899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000366252A Expired CA1147535A (en) | 1980-01-22 | 1980-12-05 | Mould particularly for casting hygienic-sanitary apparatus with integral rim of the closed or open type |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0032274A3 (en) |
| BR (1) | BR8007298A (en) |
| CA (1) | CA1147535A (en) |
| IT (1) | IT1154052B (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2015917B (en) * | 1978-03-10 | 1982-01-20 | Ideal Standard | Slip casting mould |
-
1980
- 1980-01-22 IT IT46804/80A patent/IT1154052B/en active
- 1980-11-10 BR BR8007298A patent/BR8007298A/en unknown
- 1980-12-05 CA CA000366252A patent/CA1147535A/en not_active Expired
- 1980-12-30 EP EP80201247A patent/EP0032274A3/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| IT1154052B (en) | 1987-01-21 |
| IT8046804A0 (en) | 1980-01-22 |
| EP0032274A2 (en) | 1981-07-22 |
| IT8046804A1 (en) | 1981-07-22 |
| EP0032274A3 (en) | 1981-08-05 |
| BR8007298A (en) | 1981-07-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |