3R35
Description: MORTICE LOCKING LATCH
Purpose
To provide a secure latch, operable by handle from one side, and by key from the other, for use on wooden doors in shops, offices and private dwellings.
Overview
Mortice lock with formed-up case, welded forend and flat cap screwed to pillars in the case. Upright lock with follower for handle vertically above keyhole, and snib follower vertically above that.
The lock is designed to have a handle on one side of the door only (special half-sets of furniture). In "latched only" state i.e. having just pushed door to, the bolt can be withdrawn by means of the handle (from inside) or by partial turn of the key (from either side). A full turn of the key in the locking direction effectively deadlocks the handle which can then only be released by a full turn in the opening direction. The snib (above the handle) can be used to hold the bolt in the withdrawn position.
Features
Deadlocking slide (directly above latch bolt) deadlocks the latch bolt when the latter is engaged in the locking plate and prevents springing back by whatever means (Note: Gap between locking plate and forend must not exceed 3 mm).
Deadlocking of handle (full turn of the key) to prevent operation of the handle from outside by breaking glass/panel etc. and reaching through.
5 lever locking mechanism with 9 lifts/lever affording at least 25,000 usable differs.
False notching and common belly form on levers to deter reading and manipulation attacks.
Key thrower with curtain to restrict access to the locking mechanism and further frustrate manipulative attack.
Internal components designed to collapse under strong key attack leaving lock secure.
Steel box on locking plate to protect head of bolt from jemmy attack.
Robust general construction - at least as strong as any softwood door to which it is likely to be fitted.
Lock must be capable of performing the following operations without loss of function and without incurring undue wear in any part:
60,000 latch withdrawals using key.
240,000 latch withdrawals via follower.
300,000 slams.
60,000 full turns of key to deadlock and release.
Additional Features
Edge gated levers suitable for master keying in suites compatible with other Chubb Security Range locks.
Snib to hold bolt in withdrawn position and prevent door from accidentally latching.
By inhibition of deadlocking action (3R35X version) lock is suitable for use in fire escape situations i.e. handle is always operable.
Materials and Finish
|
Lockcase, cap, forend and locking plate |
: |
mild steel (painted) |
|
Bolt head, deadlocking slide and follower |
: |
steel sinterings (nickel plated) |
|
Bolt tail, runner, dogging slide, detent, thrower flange and bolt stump arm |
: |
mild steel
(nickel plated) |
|
Levers and thrower spindle |
: |
brass (natural finish) |
|
Lever Springs |
: |
18/8 stainless steel |
|
Lever spring support |
: |
Glass reinforced nylon |
|
Snib follower |
: |
Mazak 3 |
|
Thrower retaining spring |
: |
zinc plated spring steel |
|
Springs generally |
: |
stainless steel |