Patent GB-295460-A (GB)
Title: Improvements relating to weighing apparatus
IPC: G01G1/04
Filed: 1927-05-31
Abstract: 295,460. Maatschappij tot Vervaardiging van Snijmachines volgens van Berlkel's Patent en van Andere Werktuigen, and Weenen, F. L. van. May 31, 1927. Indicating - mechamism; computing-apparatus, -A weighing-apparatus comprises, in combination, weighing mechanism which is. restrained by a pendulous or,other resistant so as to move proportionally to the load placed thereon, electrically-actuated indicating mechanism and a control member movable with the indicating mechanism and co-operating with the weighing mechanism to start the electrical actuation of the indicating mechanism when the weighing mechanism moves relatively thereto and to stop the electrical actuation of the indicating mechanism when the control member has been moved proportionally to the weighing mechanism. As shown diagrammatically in Fig. 1, the scale pan 1 is supported on a beam 2 and is connected in usual manner to check link mechanism 3 and to a pendulum-lever 4. Near one end of the beam are arranged two electrical contacts 8, 9 carried by levers 10, 11 connected by an insulated link 13 and pivoted upon an insulating support 12. The support 12 is mounted upon an endless belt 18 which may be driven by an electric motor 27 and may drive an indicating band-chart 29 viewed through an aperture 31. When a load is added to or removed from the scale pan 1 an electric contact 7 on the beam engages one of the contacts 8, 9 and establishes a circuit through one of the electro-magnets 38, 39, and at the same time displaces the lever 11 from a contact 16 so as to remove an electrically-controlled brake 56 from the motor 27. The electromagnet 38 or 39 operates a change-over switch 41 so as to rotate the motor in the appropriate direction and thus actuate the endless belt 18 and band-chart 29. The movement continues until the displacement of the support 12 removes the contact 8 or 9 from the contact 7 and allows the contact 16 to close whereupon the circuit of the motor 27 is broken and the brake 56 is applied, the bandchart 29 then indicating the load upon the pan. In a modification, Fig. 3, wherein the control of the circuits are associated with the pendulum lever instead of with the weigh-beam, an arm of the pendulum lever carries an insulated pin 62 adapted to move into engagement with and displace one or other of two insulated levers 65, 66 which are weighted so as normally to maintain contact with an insulated pin 72 carried by quadrants 74, 75. The displacement of one of the levers 65, 66 breaks a circuit through the pin 72 and withdraws a brake 110 from the electric motor 77 and at the same time the contact of the pin 62 with the lever 65 or 66 operates a change-over switch and rotates the motor 77 and quadrants 74, 75 in the appropriate direction to restore the pin 72 and levers 65, 66 to the position, relative to the pin 62, shown in the Figure, thus stopping the motor. The quadrant 75 actuates the band-chart 86 through gearing to indicate the weight. In a further modification, Fig. 6, the scale beam 121 is connected by a rod 124 to a lever 125 terminating in a contact ball 127 situated between insulated contact screws 129, 130 carried by a toothed quadrant 132. When a load is placed upon, or removed from, the scale pan 120, the contact ball engages one of the contact screws and establishes a circuit through two or the motor terminals 150 - - 152 and causes the motor to rotate an indicator shaft 136 and, through gearing, to turn the toothed quadrant 132 until the contact screws 129, 130 leave the contact ball 127 and thus stop the motor, at the same time applying a brake 142. The indicator shaft 136 carries a graduated indicator cylinder 137 and additional cylinders to which the higher indications are transferred. Shock absorbers 164, 165 are fitted to the rod 124. A forked rod 169 suspended from the sector 132 embraces a projection 171 on the beam 121 and prevents heavy pressure from being placed upon the lever 125.