Gatelocks0 pages

This information is for guidance only and is
not intended to form the basis for contract.
All dimensions in mm.

Gatelocks
Types VL10, VL11, VL20, VL21, VL30, VL31, VL60, VL61
Publication Number GL011/1211
Application
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 and the
VL60/61 with double swing doors. The gatelocks 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.
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Note:t VL11, VL21 and VL61
Operation is in accordance with BS5655:Part1:1986 except for clause 7.7.3.1.1 and Appendix F1.
For use as like-for-like replacement only, in accordance with BS5655:Parts 11 & 12:Clause 2.2.

Operation
As the door(s) close(s) the beak enters the lock, engaging with an insulated cam carrying a self-aligning contact that
completes a circuit when the beak reaches a closed position. This circuit is in series with the retiring ramp and a call for
the lift immediately causes the ramp to withdraw, allowing the lever to fall forward so that the locking plate engages,
locking the beak(s) in position. This action also makes a second circuit which is the actual control-circuit interlock of the
lift controller.
Type Approval
This new development of the VL10/20/30 locks is clearly identifiable by the moulded transparent polycarbonate covers
and the transparent contact carrier. These are design improvements to the range implemented by Dewhurst plc to meet
the B.S. Requirement that the lock contacts should be visible for insurance inspection purposes.
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The VL10/20/30 locks now comply with the type-examination requirements of
EN81:Part1:1988, Appendix F.1. Landing Door Locking Devices.

Note:t
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Metal covers are still available to order for the VL10/20/30 locks but locks with this option do not comply with
BSEN81-1:1998

Construction
The lock is housed in a substantial, die-cast frame, enclosed at front and back by two captive screws. The
VL10/20/30/60 and 61Gatelocks beak and carriers are aluminium bronze castings, the VL11/21 and 31 Gatelocks beak
and carriers are brass castings. The beak is chamfered for easy entry into the lock.
Contacts
Contacts are self-aligning with self-cleaning action and have a positive knock-off feature.
Rating - VL10/20/60 locks
2A @ 240V a.c., 0.7 power factor
1A @ 240V d.c., inductive load with a time constant of 100ms
Weights
VL10 Gatelocktt
=t
2.36kgtt
VL30 Gatelocktt
=t
2.4kg
VL11 Gatelocktt
=t
1.6kgtt
VL31 Gatelocktt
=t
1.6kg
VL20 Gatelocktt
=t
2.45kgtt
VL60 Gatelocktt
=t
10kgt
VL21 Gatelocktt
=t
1.6kgtt
VL61 Gatelocktt
=t
6.4kg
f you require further information on our gatelocks please ask for the following publication numbers:
VL10 Gatelocktt
-t
II063tt
VL30 Gatelocktt
-t
II062t
VL11 Gatelocktt
-t
II051tt
VL31 Gatelocktt
-t
II029
VL20 Gatelocktt
-t
II054tt
VL60 Gatelocktt
-t
II014
VL21 Gatelocktt
-t
II030tt
VL61 Gatelocktt
-t
II052

Dewhurst UK Manufacturing Ltd - Unit 9, Hampton Business Park - Feltham - TW13 6DB - UK
Tel: +44 (0)20 8744 8200 - Fax: +44 (0)20 8744 8299 - Email: info@dewhurst.co.uk - www.dewhurst.co.uk
This information is for guidance only and does not form the basis for contract - Dimensions in mm