Door-closer with overload valve

A door closer with a first chamber 5 defined by a piston 9 movable between a door open position with a first volume, and a door closed position with a second volume, the first volume being greater than the second volume, with the first and second chambers being connected with a main valve (20 Fig 1)...

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Bibliographic Details
Main Authors Stuart Leslie Norcott, Bruce Patrick McCarthy, Simon Gibbs
Format Patent
LanguageEnglish
Published 17.05.2023
Subjects
CHECKS FOR WINGS
DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION
FIXED CONSTRUCTIONS
KEYS
LOCKS
SAFES
WINDOW OR DOOR FITTINGS
WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THEFUNCTIONING OF THE WING
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Summary:A door closer with a first chamber 5 defined by a piston 9 movable between a door open position with a first volume, and a door closed position with a second volume, the first volume being greater than the second volume, with the first and second chambers being connected with a main valve (20 Fig 1) which can hold the door in an open position, and an overload valve 91 such that should pressure within the first chamber exceed a threshold pressure it allows fluid communication between the first and second chambers 5 7. In the door closed position, a protruding head portion 915 on the piston is at least partially received within a corresponding recess 202 located opposite the head portion on the first chamber. The overload valve 91 is located in the protruding head portion of the piston 915. The overload valve may include a spring biased ball bearing 912. The overload valve allows the door to be closed faster than the normal damped motion if the door is pushed. Also claimed is a situation where the piston has a recess and the first chamber has a protruding head portion.
Bibliography:Application Number: GB20180015834