Patent GB-869944-A (GB)
Title: Improvements in or relating to weighing apparatus
Inventor: SMITH JOSEPH WILGAR
IPC: G01G17/04
Filed: 1959-05-05
Abstract: 869,944. Weighing apparatus. CALOR GAS (DISTRIBUTING) CO. Ltd. Nov. 4, 1959 [May 5, 1959], No. 15356/59. Class 143 A predetermined weight of material is automatically fed to a container of unknown weight by apparatus comprising a container support, a pivotable weigh bar whose deflection depends on the load on the support, a pivoted control member whose range of pivotal movement is between a rest position and a limiting position, and electromagnetic means for interlocking the control member and the weigh bar. The arrangement is such that a container may be placed on the support with the interlocking means inoperative and after the weigh bar has responded to the weight of the container the control member in its rest position is locked to the weigh bar and feed takes place until the control member reaches its limiting position where it operates means to stop the feed. As shown for filling containers with liquefied gas, the liquid is fed to a bottle 16 on the support 3 by means of a feed pipe 19 communicating with a supply pipe 17 through a valve 18. In Fig. 1 the weigh bar 4 is rigidly attached to a spindle 5 which turns in accordance with the load on the support 3 by means of the unspecified mechanism of weighing machine 1, and the control member is a bar 6, pivoted at 7, whose end Z is free to move between a lower rest position where it contacts the end of a screw 13 by which the range of pivotal movement is adjustable and an upper limiting position where it contacts a frame 11 at the same time operating a micro-switch 14. The end Y of the bar 6 carries a magnetisable plate 9 which, together with an electromagnet 10 carried by the weigh bar 4, constitutes the locking means. A second electromagnet 15 serves to hold the control bar 6 in its rest position. The construction in Fig. 5 differs from that in Fig. 1 only in respect of the control member which here comprises a magnetisable disc 45 freely rotatable on the pivot spindle 5 (not shown) of the weigh bar 4. The interlocking electromagnet 10a is carried by the pivot spindle and is normally spaced from the disc 45 by spring loaded plungers carried on the magnet casing and operative to displace the disc 45 longitudinally on the spindle 5 when the magnet 10a is unenergised. The range of pivotal movement of the disc 45 is limited by an arm 48 carried by a bracket 47 attached to the disc periphery, the length of the arm being adjustable by its lower portion 49 being screw-threaded into the bracket 47 whilst the upper portion is a fixed rod. Electromagnet 15a provides a stop defining the rest position in which, when energised, it holds the control member. The switch 14 provides the stop defining the limiting position. In both forms the apparatus is employed as follows. A container is applied to the support 3 with locking magnet 10 or 10a unenergised and holding magnet 15 or 15a energised. When the weigh bar comes to rest the operator closes a switch 21 which energises a relay whose contacts release the holding magnet, operate the locking magnet, energise a solenoid to open valve 18 and operate signal lamps indicating the condition of the valve. When switch 14 is operated by the control member the relay is de-energised to stop the feed and reset the apparatus to its initial state.