Dewhurst Ltd
Unit 9 Hampton Business Park
Hampton Road West
Feltham
TW13 6DB
t: +44 (0)20 8744 8200
f: +44 (0)20 8744 8299
info@dewhurst.co.uk
For use on lift landings, Dewhurst gatelocks are robustly designed dual-contact locks, with pre-locking features. The VL10/11/20 and VL21 are use with collapsible gates or sliding doors; the VL30/31 with single swing doors. The gate locks are used in conjunction with a suitable retiring ramp (such as the Dewhurst Type FR21) and are adaptable for either right-hand or left-hand operation.
The rugged, low cost VC40A switch is used with a suitable operating ramp, to limit the travel of electric lifts and skiphoists etc. requiring accurate positioning at low speeds. It is supplied with normally-closed contacts and an earth safety screen.
This rugged, competitively priced VC50 switch is used with a suitable operating ramp to limit the travels of electric lifts and ship hoists. It is supplied with one normally open and one normally closed contact.
The car gate switch is for incorporation in the interlocking circuits of collapsible gates or sliding doors of lift cars.
The EM21 is designed to provide car position signals in the control of electric and hydraulic lifts and elevators. It is a rugged and heavy duty switch, small enough to fit within the overall depth of standard T guides. The EM21 is rated to IP32.
Switch rating:
This geared limit switch is for use in light and medium-duty applications where it is necessary to limit reciprocating motion. The point at which the switch operates is precisely and easily adjustable by means of a special microsetting device.
Available versions:
The VF20, or Coffin Safety Switch is designed to be incorporated in pilot interlocking and safety circuits of control equipment. Contact ratings available as 200Watt max @ 240Vdc 2A (non-inductive), 200Watt max @240Vdc 1A (inductive) or12KVA max 440Vac RMS 5A max.
FR21 is designed to prevent landing doors or gates being snatched open whilst the lift car is passing through a LOCK zone at intermediate floors. Used in Dewhurst prelocking lift systems it also ensures that the landing door mechanism has functioned correctly before the car is allowed to move away.
With Formula System safety edges there is less to go wrong. All the electronics are contained in the edges. The cable to the edges is a standard flex so if the cable breaks you can replace it easily. The Formula Systems patented diagonally offset beam pattern ensures that the whole of the entrance is protected. It also means a faster scan time which allows the edges to respond in 45ms to a beam interrupt.
Dewhurst UK are authorised distributors of Formula Safety Edges spares.