Patent GB-546835-A (GB)
Title: Improvements in press structures for hydraulic presses
IPC: B30B15/04
Filed: 1941-03-26
Abstract: 546,835. Hydraulic presses. MULLER, J. A. March 26, 1941, No. 4087. Convention date, Oct. 24, 1940. [Class 69 (ii)] [Also in Groups XVI and XXII] A hydraulic press is constructed with a press head 1 and a press base 2 connected thereto which together with the press body form a hollow integral unit of tubular shape throughout its length, the interior of said hollow unit being in continuous communication with the outside of said unit. In some cases the parts 1, 2 are formed with window openings 23, 24 to facilitate the insertion of the work bed which may be formed of sections. Above the press head is mounted a tank 3 fitted with a surge valve 7 which co-operates with a pipe 9 to supply the pressure liquid, and which may be of the kind described in Specification 535,625. The ram 6 is fitted with a centring disc 20 on which is mounted a platen 22 to receive a die, and with wear plates 28 to receive cushioning plungers 30 which co-operate with cylinders 31 secured by screws 33 to the hollow segments 34 which form the outer members 34 of the work support. These segments rest on shoulders 39 in the base 2, and between them a hollow cylindrical member. 41 is mounted which is also formed with a shoulder resting on inner shoulders 40 of the segments 34. The members 34, 41 constitute the work bed. As cast the diameter of the recess in the base 2 is greater than the bore of the ram cylinder 5, and in constructing the press the cast part is inverted and the ram 6 inserted through the base after machining the interior by means of tools inserted through the base opening. The method of making the press is disclosed and claimed in Specification 546,834, [Group XXII]. The ram 6 is fitted with packing members held by screws 13 and the platen member 22 shaped as shown in Fig. 3, is inserted by passing its narrow side through the windows 23, 24 and it is rotated through 90 degrees and then held in place by cotters 26 which are screwed to the sides of the platen and engage the edges of the windows 23, 24. The base members 34, 41 are secured in position after the press is turned back to normal position. The valve 7 and tank 3 are then added. In modifications the work support may be a hollow cylindrical member which screws into the base, or the base and head may be cast separately and formed with directly engaging flanges which are secured by bolts and nuts. In Fig. 9 the press head 61 rests directly on a floor and the bed 64 is connected to the press head by a bayonet-like fastening and is held from rotation by bolts 68. The bed 64 is fitted with a bed plate 69 provided with a cushioning cylinder 72. The platen 51, Fig. 19, may be held in position after assembly by means of segmental members 52 held in place by screws 53, and an annular packing member may be used in this form. In Fig. 20 the press head, base and bed constitute a single casting, and the head is provided with a bore 90 through which a bore bar is introduced for machining the cylinder &c. A plug 91 is used to close the head after the machining operation. In a further modification in which the press head and base are integral, a circular platen is used, and the cushioning plungers are connected by screws to the platen. The platen is guided by segmental gibs arranged in a bore in the press head.