Patent GB-440692-A (GB)
Title: Improvements in or relating to presses for producing plates and other flat building elements
IPC: B30B11/04
Filed: 1935-02-16
Abstract: 440,692. Moulding flat building- elements ; mechanical presses. DIETRICH, A., La C¶te, Haute Saone, France. Feb. 16, 1935, No. 5093. [Class 87 (ii)] In a press for moulding plates and other flat building elements comprising a mould having a bottom 22 displaceable to three levels, one for filling in material, a second to which the bottom is raised to press the plate, against a locked hinged lid 6, to a definite thickness, and the third for removing the plate, three abutments 50, 53, 59 are provided to move with the bottom and to engage mechanism to effect interruptions in the drive to stop the bottom at the three levels. The lid 6 has hinges 7 fixed at one end to a shaft 8 and at the other end provided with recessed projections adapted to be engaged by a displaceable locking bar 16. The lid may be provided with a mark for impressing on the building element. The mould bottom 22 is displaced by screw spindles 23 working in sleeves 24 rotatably mounted in bearings 25, 26 fixed on the frame. The sleeves 24 are rotated by worm gearing 29, 30 from a shaft 31 driven by an electric motor 34. The lid 6 is provided with counterweights 12 mounted on a bar 11 secured to the lid by supports 10. The bar 16 is normally held in locking position by a spring 17 and is moved to release or lock the lid by cam levers 19, 21. Forward and reverse motions of the motor are actuated by a change-over switch 35 mounted on a control shaft 36 rotated by a handle 37. The switch is normally held in the inoperative position by springs 38, but when turned is maintained in position by a locking arm 39 on the shaft 36 engaging a two-armed detent 40 which is moved to release the arm when the bottom 22 has moved to a predetermined position. The detent is re-set by springs 41. The abutments 50, 53, 59 are carried by a shaft 62 fixed to the bottom 22 and are adapted to engage a lever 43 or a spring pawl 44 thereon to move the detent and release the arm 39. An abutment 53 is carried on each of a series of cams 54 loosely held on a sleeve 56 which can be raised by a handle 58 to adjust its position and a selected abutment can be rotated into position on the sleeve. The abutment 50 is adjusted on the shaft 62 and an abutment 53 is selected to determine the thickness required for the moulded article. The motor shaft 31 is held stopped by braking discs 68, 69 operated to release the shaft by engagement of a cam 65 on a lever 66 with a cam 63 on the shaft 36. In operation, with the bottom 22 slightly above the top of the mould and the lid open, the abutments 50, 53 are adjusted and the switch turned to bring the arm 39 to the position 39<1>. The brake is thus released and the bottom lowered until the abutment 50 strikes the lever 43, the abutment 53 having passed over the pawl 44 without operating the lever 43. The switch is thus returned to inoperative position and the mould is filled and the lid locked down. The switch and arm 39 are then turned to the position 39<11> to raise the bottom and compress the material against the lid until the abutment 53 hits the pawl 44 and so releases the arm 39. After the material has set, the bottom is lowered slightly by turning the switch and is stopped by the operator depressing a pushbutton 49 to move an arm 46 against the lever 43. The lid is opened and the switch turned to raise the bottom and eject the moulded article, the switch being maintained by hand in operative position until the abutment 53 has moved past the pawl 44.