Key Token Accessories

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Tyer Key Token Instruments Accessories
The Key Token Instrument - as described in a separate leaflet is capable of a number of additional functions. The Accessories described in this leaflet cover the main requirements, but other variants such as telephones, crossing attachments and solar power cells are possible, details of which are available on request.
Key Token Transfer System TY14 & TY15		This unit consists- of two items (a) The attachment, secured to the Key Token Instrument (b) The portable magazine for interchange between the two section Key Token Instruments. These units are interlocked such, as to enable the balancing of Token Keys from one Key Token Instrument to another within the section, preventing token or tokens being misused or lost. The portable magazine is designed as such to enable the Key Token to be physically seen but unobtainable until presented to the required section Key Token Instrument

Switching Out Unit		The Switching-out Unit caters for long or short section working. When through train working, especially at night, is necessary the short sections can be closed by withdrawing a token key from the short section instrument and inserting same in the switching out unit. This permits the long sec tion of one or more short sections to be brought into operation.

Key Token Locks		Where it is necessary to control, by use of a token key, a form of mechanical lock such as in-section sidings or signal box levers these units are ideally suited. They may be used to lock point or signal operating slides directly, or to lock the releasing levers of ground frames etc. Each lock consists of a cast iron case and by insertion of the token key a lock slide is operated. A spring, loaded against the releasing action of the key, ensures that the force applied must be positive and that when the lock slide has completed its travel, the key is retained in its lock unless a positive anti-clockwise operation is applied. Insertion of a key with an incorrect con figuration is prevented by a matching plate inserted in the key entry point. The cast iron case is available with a number of fixing positions, details on request.

Key Pouch		This unit, comprising a robust hoop and pouch, ensures an efficient method of carrying and exchanging the token key. The hoop, manufactured of galvanised wire is covered with leather. The pouch, also of leather, has a retaining buckle and, at the rear of the pouch a hole, so positioned that the section limits engraved on the key may be viewed without having to remove the key.


Hand Generator	A suitable hand generator can be fitted to the Key Token Instrument, or supplied as a separate item, to provide an alternative to a Battery supply. The unit, of robust design and fully tropicalised, provides a steady current to operate the system requirements between two Key Token Instruments.

Batteries	Suitable primary batteries can be supplied to operate the system between two Key Token Instru ments. The battery of the polarised non-rechargeable type has been designed to withstand tropical and arduous conditions and give an exceptionally long life.

Key Token Battery Stand	A suitable stand can be provided for the Key Token Instrument including a cabinet for housing batteries if required.