Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – For extrusion or injection type shaping means
Patent
1976-05-13
1988-12-13
Hoag, Willard
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
For extrusion or injection type shaping means
425195, 425595, B29C 3332, B29C 4564
Patent
active
047907398
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In order to clamp parts of machines to each other, accurately and safely, use is generally made of screws, bolts and other similar means. Where the connected parts are subjected to high stresses and must frequently be disassembled and reassembled it is clear that the number of screws that must be handled are far too much time and the work becomes incompatible with economic and competitive production. FIG. 1, for example, shows a system at present used in the presses for making ceramic tiles to connect the upper and lower dies each other.
It will be seen from the figure that situated between the upper plate (10), heated by elements (11) and the block (12) heated by elements (13), there are the lower die (14) and the upper die (15) which, when pressure is applied, press on the tile (16) retained at its perimeter by a matrix die (17).
The upper die (15) is held to the upper plate (10) by a series of cheese-headed screws (18) and the lower die (14) is also fixed by cheese-headed screws (20), but between the head of the screw (20) and the die (14) there are two Belleville washers (25-26).
Due to a high pressure applied and to heating, the humidity contained in the clay of which the tile is made, evaporates leaving deposits of lime on the sides of each die, which leads to heavy wear and makes it necessary to replace the pads frequently.
There are many of these dies to be periodically replaced in each press and numerous screws holding them in position consequently should be often replaced, with the press out of action, the time required for replacement is long, making for higher costs of production and lower output.
If quicker means are employed, such as levers, clamps and the like, though this may make it quicker and simpler to disassemble and reassemble the opposed parts, there is generally an adverse effect on safety and accuracy.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved quick release connector of opposing parts, by means of which the above drawbacks would be avoided and at the same time, considerable advantages would be obtained.
A further object of the invention is a quick connection for holding together opposed mechanical parts especially the dies in presses for making ceramic tiles.
In one of the parts to be connected a pin is placed having a head which, with a slight amount of play, penetrates the tubular opening of the central body of a piston sliding in a cylindrical chamber placed in the other part to be connected by the fastener or connector of this invention.
Said piston is subjected to the effects of both an elastic means that tends to hold it away from the head and of a fluid, such as oil or the like, acting in the opposite direction.
The tubular mouth of the central body of the piston, sliding with a slight amount of play in a ringwise seat at the front of the chamber, has radially placed holes passing through it in which small sized balls are lodged.
Ball diameter is less than the radius of the annular seat referred to above, less than the pin radius, but greater than the radius of said seat which is less that of the head.
Coaxial to the annular seat and above it there is a second annular seat the radius of which is greater than the diameter of the balls increased by the radius of the head.
The effect of all the above is that, when the parts to be connected are superimposed, and when the pin head is inside the tubular mouth of the piston to a point beyond the balls, fluid pressure is reduced to nought or at any rate to a value below that created by the elastic means, said elastic means, through the balls, exercises a pulling effect between the piston and the head of the pin sufficient to hold the above two parts together.
On the contrary, when pressure greater than that of the elastic means is generated in the fluid, the piston moves towards the above mentioned head and the balls are carried to the position of the wider seat where there is a sufficient space for them to abandon said head allowing the two held parts to
REFERENCES:
patent: 3528141 (1970-09-01), Anderson et al.
patent: 3638473 (1972-02-01), McElroy
patent: 3908500 (1975-09-01), Gargrave et al.
patent: 3965813 (1976-06-01), Pfost
patent: 3987681 (1976-10-01), Keithley et al.
patent: 4274332 (1981-06-01), Nakamura
patent: 4372738 (1983-02-01), Black et al.
patent: 4490103 (1984-12-01), Vogt
patent: 4561626 (1985-12-01), Black
Hoag Willard
Lema S.R.L.
Striker Michael J.
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