Metal founding – Means to shape metallic material – Including means to assemble mold parts
Reexamination Certificate
1998-01-12
2001-06-26
Lin, Kuang Y. (Department: 1722)
Metal founding
Means to shape metallic material
Including means to assemble mold parts
C425S084000, C425S451900
Reexamination Certificate
active
06250369
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a plant for pressure casting sanitary articles such as water closet pans and bidets with an open or closed rinsing rim, which uses moulds of synthetic material.
More particularly, the present invention relates to a pressure casting plant for sanitary articles with several moulds arranged one next to another, each provided at least with one mould lower element, two mould lateral elements, and at least one mould upper element and/or at least one mould transverse element, this or these being positioned transverse to the longitudinal direction of the moulds arranged in a row.
Specifically, the moulds are arranged in a row with their mould lateral elements aligned, and which can be clamped in the alignment direction by two lateral cylinders, to hence form a mould group.
A plant of this type is described in the document EP-B1-0 557 995. In the pressure casting plant described in that document, mould-carrier carriage pairs are provided together with a clamping device for joining the mould elements together by clamping them.
The clamping device is positioned on a clamping frame separated from the mould-carrier carriage.
The clamping frame can be raised and lowered between an operating position and a parking position.
In a plant with at least 6 moulds, three respective pressure casting moulds are ready in the clamping frame to be put into operation. This means that three moulds are ready and clamped, and three products are cast.
The clamping frame, which can be orientated upwards and downwards about a positionable axis relative to the mould element guide, is then orientated upwards and the moulds together with the moulded products are withdrawn by a lifting device and placed on the resting surface.
In this case sixteen clamping devices are required for three moulds, and have to be slackened to withdraw the three formed products.
When the first three forms have been removed from the clamping frame and placed on the resting surface, the clamping frame is returned to its operating position to enclose the next mould elements to be prepared and clamped, and to cast three formed products which are turned and laid on a resting surface after the sixteen clamping devices have been released.
The document EP-0 569 855 describes a plant and process for pressure casting ceramic articles such as water closet bowls.
This plant comprises a longitudinal guide following an axial direction, and several moulds which can be moved along said guide and are provided respectively with at least two lateral elements, a base element, and at least one transverse element which can be moved transversely to the axial direction between the lateral elements, plus an axial clamping device.
The moulds are combined with a single clamping cage comprising transverse clamping devices to hold the mould lower element, the mould transverse element or elements and the lateral elements of each mould together.
Suitable means join the mould transverse elements to the relative transverse clamping devices.
The clamping cage is provided with one clamping frame for each mould, on which four transverse clamping devices are positioned, namely an upper, a rear, a lower and a front.
The front device is fixed on a side which can be moved vertically on the relative clamping frame, and raised and lowered. The clamping frame can be positioned in a return position for withdrawing the formed product and also in a parking position transverse to the axial direction. When the mould elements have been moved apart, the formed product is withdrawn by an extraction device of known construction, which grips it.
The two aforedescribed plants have a certain number of disadvantages.
In the case of the plant of EP-0 569 855, each mould is located in a clamping frame within a single clamping cage. These devices are equipped for simple clamping and slackening of the individual moulds. Each clamping frame is provided with 4 transverse clamping devices which have to be slackened during the extraction of the formed products to enable them to be withdrawn by a special gripper.
In the case of the plant described in EP-B1-0 557 995, the upper and mould lower element of the three moulds are respectively extracted, then the moulds with the formed products within them are rotated about a horizontal axis, and are laid on a parking surface.
The lateral moulds are then loosened to release the formed products, the mould elements are again brought together, and are then re-rotated within the plant.
Hence a number of different clamping devices located within the clamping frame and clamping cage have to be successively slackened and tightened during various processing stages for three moulds respectively.
SUMMARY OF THE INVENTION
An object of the invention is to provide a pressure casting plant for ceramic sanitary articles which is of simple construction and does not comprise complicated clamping devices.
A further object is to provide a pressure casting plant which enables the time for the clamping and slackening stage to be reduced to a minimum.
A further object is to provide a pressure casting plant which is perfectly compatible with the mechanical properties of moulds of synthetic material, which are characterised by a low elastic modulus and hence by substantial volume changes during plant clamping.
These objects are attained according to the present invention by a plant of the initially described type in which:
a) a vertically movable lifting beam is arranged above the moulds,
b) for each mould the beam contains an upper cylinder to which the mould upper element (if present) is connected,
c) mould lower elements for each mould are fixed to a lower plate and slidable on a lower cross-member in the plant axial direction,
d) on the cross-member in the plant axial direction, namely between the lower plates, there are provided movable lateral element carriages on which, for each mould, vertical locking rods and the respective lateral elements of the adjacent moulds are fixed,
e) the locking rods can be coupled at their upper end by coupling devices which are connected to the lifting beam by weight compensation devices, and can be coupled at their lower end to the lower plates,
f) the mould group is positioned between lateral cross-members which can be moved in an axial direction on the lower cross-member and be fixed thereto, and on which the lifting beam engages during the clamping of the mould group, and finally
g) the plant can be equipped with a locking device which is transverse both to the plant axis and to the direction of movement of the lifting beam.
The mould group is composed of at least two moulds, and can be clamped against one side of a fixed cross-member which is rigid with the lower cross-member.
The lateral cross-members are fixed by a vertically movable fixing device which can be moved hydraulically, pneumatically, electromechanically. Electromagnetically or the like, and which during the plant clamping stage rests against a stop provided in the lower cross-member.
The pressure casting plant is constructed such that on the lifting beam there rest the upper frames under which there are connected the upper cylinders, the rods of which are rigid with the upper plates, which are connected to the possible mould upper elements. The upper coupling devices into which the locking rods hook are provided in the upper frames.
The pressure casting plant is constructed such that while the lifting beam is engaged on the lateral cross-members and on the fixed cross-member, the upper frames, the upper cylinders, the upper plates, the mould upper elements and the upper coupling devices with the locking rods can move freely in the plant axial direction.
Below each lower plate there is a lateral element detachment device which is inactive when the mould group is clamped, and active against the carriages of the adjacent lateral elements when the moulds are slackened, so that these carriages become slightly detached from the lower plates. The moulds are hence slightly opened on slackening the plant, and the mould is
Cassani Giuseppe
Wegmann Reinhard
Birch & Stewart Kolasch & Birch, LLP
Lin I.-H.
Lin Kuang Y.
Sacmi Cooperativa Meccanici Imola S.c.r.l.
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