Patent GB-190810536-A (GB)
Filed: 1908-05-14
Granted: 1909-05-13
Abstract: 10,536. Clothier, H. W., and Reyrolle & Co. A. May 14.. Switches.-A carriage switch embodying quickbreak oil-immersed contact-devices, more especially for use with high-voltage currents, is constructed with iron-clad casings, and with means for ensuring that the switch shall be open before the casing can be'removed, and operates in conjunction with a stationary iron-clad contact chamber provided with hinged doors, which automatically cover the stationary contacts on the withdrawal of the switch. As applied to a three-phase alternating-current distributing system, the wheeled carriage runs upon rails c mounted on supports a, and carries an oil container d, in which are arranged three switch bars e adapted to be moved up to contacts e<1>, e<2> by means of wires or ropes q. These are actuated by a handle r, which is pivoted at r<1> and is adapted, to rotate a lever q<2> pivoted at q<3>, to which the wires are attached, in such a manner that the greatest mechanical advantage is obtained at the latter part of the stroke of the lever, in order to overcome the resistance offered by the contacts while being forced together. The contacts are retained in the' on' position by a detent s engaging the lever q<2>, and, to allow the contacts to spring off, this detent may be tripped by a projection r<3> on the lever r, or by an electro -magnetic tripping-coil t attracting an armature s<1>. The leads e# from the contacts e', e<2> are carried through a metal casing m to plug contacts g, h carried in insulators f<1>, f<3>. Thecontactg is vertically above the contact h, and they engage respectively contacts pertaining to supply conductors g<1> in the bus-bar chamber g<2> and contacts pertaining to the transformers i<2> . The bus-bar chamber g<2> is built up of sections, each having three plug-socket branches g<3> and connected together by bands g<4>. The transformer chambers j are made in sections, and both the bus-bar and transformer chambers may be run in soid with insulating- material. The switch carriage carrying the plug contacts g, h is moved by means of a lever u carrying a pawl u<1> engaging ratchet teeth u<2> on the supporting- frame. The lever u makes loose contact with the lever r, and hence it is impossible to move the carriage without tripping the detent s retaining the lever q<2> and breaking contact in the oil container.d. To return the carriage, the pawls are reversed and coact with ratchet teeth u'. On the withdrawal of the carriage, the sockets o<3>, Fig. 10, pertainirg to the plugs of the switch are closed by means of doors o carried by rods p sliding in fixed guides p<1> and in guides p<4> carried by the switch carriage ; the doors are urged by springs o<4>, Fig. 9, to open out and cover the sockets o<3> when they are withdrawn from the housing between the said sockets. The guides p<4> have locking notches p<5> receiving pins p<3> on the rods p, and, on closing the switch, the rods pare moved to cause the doors to collapse into the housing ; but when projections p<6> on the rods engage camdevices, a partial rotation of the rods is produced and projections p<3> escape from notches p<5>, and further movement of the carriage causes no further movement of the rods <p> and doors o. The wires operating the oil-immersed switch may be carried in a direction opposite to that indicated in Fig. 4, and may be operated by similar mechanism. situated at the other side of a wall ; in this case, the tension of the wires prevents the carriage from being moved until the switch is opened.