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| Void free, silicon filled trenches in semiconductors |
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| Electronic-component mounting system |
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| Method of measuring accuracy of electric-component mounting system |
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| Artificial turf-like product |
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| Top dressed plating surface with resilient underpad |
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| Synthetic grass playing field surface |
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| Golf driving mat |
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| Turfing systems for stadia |
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Hydraulic press
| Details |
Inventors: Hellgren, Keijo;
Assignee: Asea Aktiebolag (Vesteras, SE)
Primary Examiner: Spicer, Jr.; Robert L.
Assistant Examiner:
Attorney, Agent or Firm: Watson, Cole, Grindle & Watson
A press for molding large sheets around a forming surface which includes an elastic press pad, a first frame member on the side of the press pad away from the working surface thereof, the first frame member having a top wall and side walls forming a pressure cell area therebetween, an elastic diaphragm in the pressure cell area in contact with the press pad, a second frame member formed in a generally L-shaped configuration to encompass and hold an annular bead of the elastic diaphragm, a trough-shaped supporting member positioned adjacent the end walls of the first frame member and the press pad such that a gap is formed between the end walls and the supporting member, a movable seal strip positioned in the gap to prevent the press pad from being pressed out of the pressure cell area when the elastic diaphragm is expanded, and a supporting strip attached to the end walls of the first frame member at a point within the pressure cell area to secure the press pad within the pressure cell area. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the Figures, 1 shows a press stand and 2 a trough-shaped supporting member in which forms 3 and sheets 4 (see FIG.
3) to be formed are placed.
The supporting member is provided wih transport rollers 5 running on tracks 6.
The supporting member or trough 2 is displaceable between the position shown in FIG.
1, in which pressed sheets are removed and new sheets 4 are placed on forms 3, and a position inserted into the press stand in which a press pad 7 forms the sheets.
The press stand shown is of the kind which is composed of an upper yoke 10, a lower yoke 11, two spacers 12 and a strip sheath 13 holding these objects together.
This strip sheath is surrounded by a protective plate 14.
The stand rests on a support 15 having bearing surfaces shaped to suit the shape of the press stand.
The yokes 10 and 11 and the spaces form a rectangular window opening and a parallelepipedic space.
At the upper part of this space a disc first frame member 16 with end walls 16a is suspended by means of attachment devices (not shown).
In the depression between the end walls 16a, a bag-like diaphragm 17 with an annular bead 18 around its opening is inserted with the help of a second frame member 20 and bolts 21.
The frame 20, which has an L-shaped configuration, and the disc 16 form a slot fitting the bead 18.
The diaphragm 17, the disc 16 and the frame 20 define a space 22 and form a pressure cell.
This communicates with a pressure medium source (not shown) through conduit 23 and valve devices (not shown).
The diaphragm 17 also fills up spaces between the attachment portion of the diaphragm and vertical walls in the disc 16, i.
e.
, spaces horizontally outside the diaphragm.
When the trough-shaped supporting member 2 is in the press stand, the transport rollers 5 rest on discs 24 which are supported by springs 25 with such a strength that they are capable of carrying the supporting member 2 with forms 3 and workpieces 4.
During pressing, the supporting member 2 will rest on the lower yoke 11
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Metal Working 
