Patent GB-778218-A (GB)
Title: Electrodeposition of titanium, zirconium, hafnium, vanadium, tantalum and niobium
IPC: C25C3/26
Filed: 1954-05-20
Abstract: 778,218. Powder metallurgy. HORIZONS TITANIUM CORPORATION. May 20, 1954 [May 28, 1953], No. 14831/54. Class 83 (4). [Also in Group XXXVI] Sintered rods of carbides of zirconium, hafnium, vanadium, tantalum, and niobium, as well as of titanium, are produced by the method for producing rods of titanium carbide described in Specification 777,824, carbides of the above-mentioned metals in powder form being employed instead of the titanium carbide specified therein. 778,219. Machine-tool details. BERLINER MASCHINENBAU - AKT. - GES. VORM. L. SCHWARTZKOPFF. June 9, 1954 [June 12, 1953], No. 16911/54. Class 83 (3). [Also in Group XIX] In means for adjusting the position of a machine part, e.g. a machine-tool slide, a stop is displaced on the machine-bed by a screw rotated by an electric-motor, whose number of rotations is controlled by a counting-mechanism co-operating with a preselector, and the slide is then fed against the stop. To compensate for pitch-errors in the screw, two screws 1 are used and their nuts 2 are coupled by a lever 3 having the stop 5 pivoted thereon so as to average the screw-pitches. The screws are driven by gears 8 thereon and a pinion 10 rotatable through oppositely-rotating electromagnetic clutches 11, 12, respectively driven from the motor 14 directly and through reversegear 13. One gear 8 is adjustable on its screw 1 for relative adjustment of the nuts 2, and the screws and gears are selected to move the stop 1 mm. for one rotation of the motor. The motor also drives three contacts 21, 20, 19 corresponding to units of 10 mm., 1 mm. and tenths and hundredths mm. respectively, and a nut on a screw 26 driven from contact 20 gives linear displacements in units of 100 mm. The contacts and the nut are in circuit with the preselector 27, the nut sliding along a graduated contact-scale 18. Operation. The indicators of the preselector are set according to the number of mms. and fractions thereof in the required displacement of the slide. Actuation of a push-button 41 connects the motor to the screws 1 through clutch 11, energizes the counting-mechanism and starts the motor, e.g. at 3,000 r.p.m. When the nut reaches a point on the contactscale 18 corresponding to the setting of indicator k of the preselector, a relay 49 is closed to connect the indicator i to the corresponding contact of a disc 17, and when rotation of contact arm 21 closes this contact, a relay 50 is energized to reduce the motor-speed to 500 r.p.m. Also, a relay 52 is actuated to connect indicator h to the corresponding contact of a disc 16, and after rotation of the contact-arm 20 to close this contact, a relay 53 reduces the motor-speed to 6 r.p.m. and a relay 55 connects indicators f, g to the required contacts of a disc 15. Rotation of the contactarm 19 closes its contacts, and a relay 56 is actuated to de-energize clutch 11 and bring the stop 5 to rest in its set position. The slide may then be fed to bring a finger 6 thereon against the stop 5. At the same time the motor is reversed by switch 57 to drive the contact-arms backwards until, when they are re-set to zero, a limit-switch 58 is operated by the nut - and - screw 26 to de-energize relay 56 and stop the motor. Initial actuation of push-button 44 energizes clutch 12 instead of clutch 11 for rotation of screws 1 in the opposite direction. The slide may carry several fingers 6 spaced 1000 mm. apart on the slide, these being brought selectively into position by the preselector to increase the range of adjustment.