GB2538829A - Preventing entry via nightlatch without removing key - Google Patents

Preventing entry via nightlatch without removing key Download PDF

Info

Publication number
GB2538829A
GB2538829A GB1601831.9A GB201601831A GB2538829A GB 2538829 A GB2538829 A GB 2538829A GB 201601831 A GB201601831 A GB 201601831A GB 2538829 A GB2538829 A GB 2538829A
Authority
GB
United Kingdom
Prior art keywords
key
bolt
retaining bar
nightlatch
spring clip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB1601831.9A
Other versions
GB2538829B (en
GB201601831D0 (en
Inventor
Kenneth Lacey Charles
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB1601831.9A priority Critical patent/GB2538829B/en
Priority claimed from GB1401556.4A external-priority patent/GB2522633A/en
Publication of GB201601831D0 publication Critical patent/GB201601831D0/en
Publication of GB2538829A publication Critical patent/GB2538829A/en
Application granted granted Critical
Publication of GB2538829B publication Critical patent/GB2538829B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B45/00—Alarm locks
    • E05B45/06—Electric alarm locks
    • E05B45/0605—Electric alarm locks for preventing of leaving the key
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B45/00—Alarm locks
    • E05B45/06—Electric alarm locks
    • E05B45/08—Electric alarm locks with contact making inside the lock or in the striking plate
    • E05B45/10—Electric alarm locks with contact making inside the lock or in the striking plate by introducing the key or another object
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
    • E05B47/0001—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof
    • E05B47/0002—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with electromagnets
    • E05B47/0003—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with electromagnets having a movable core
    • E05B47/0004—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with electromagnets having a movable core said core being linearly movable
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
    • E05B47/02—Movement of the bolt by electromagnetic means; Adaptation of locks, latches, or parts thereof, for movement of the bolt by electromagnetic means
    • E05B47/026—Movement of the bolt by electromagnetic means; Adaptation of locks, latches, or parts thereof, for movement of the bolt by electromagnetic means the bolt moving rectilinearly
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C17/00—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith
    • E05C17/02—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means
    • E05C17/04—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means with a movable bar or equivalent member extending between frame and wing

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closing And Opening Devices For Wings, And Checks For Wings (AREA)

Abstract

A nightlatch is provided with an internal spring clip located inside the key cylinder with the spring clip and the key cylinder housing being electrically isolated and forming opposing terminals of a low voltage solenoid 4, such that when a key is inserted it completes the circuit and activates the solenoid causing a bolt 3 to project outwards and engage with pivoted retaining bar 7 which is suspended via a pivot 6 to the door frame 2. The bolt engaging with the retaining bar prevents the door opening sufficiently to allow entry until the key is withdrawn which breaks the circuit allowing the bolt to return to neutral (retracted position) and the retaining bar to drop back to vertical.

Description

Preventing entry via nightlatch without removing key This invention relates to a means of preventing a keyholder from entering a premises by means of a nightlatch without removing the key.
Homes are often burgled and cars etc stolen because a keyholder enters the premises, then closes the door without removing the key, providing an oppertunity for a passing thief.
According to the present invention there is provided a method of preventing a keyholder entering a premises by nightlatch without first removing the key by preventing the door from being opened sufficiently to allow entry until the key is withdrawn.
A specific embodiment of the invention will now be described, with the aid of the enclosed drawings in which-Drg 1 shows the mechanism within the lock cavity, drg 2 shows the requirements on the inner face of an external door.
Description
Drg lfig 1 shows a longitudinal section thro a typical cylinder lock with tumblers etc omitted and key withdrawn comprising-cylinder housing 1, cylinder 2, and turning bar 3 which projects thro into the latch casing. Spring clip 4 is secured to, but insulated from the inner end of the cylinder. Latchkey 5 (fig 2) terminates in a plain flat portion 6 which engages with th spring clip when the key inserted to it's operating depth.
* The spring clip and the housing are wired to the opposing terminals of a low voltage solenoid on the inner face of the door. Inserting the key in the cylinder completes the curcuit via spring clip/key/cylinder and housing, thus activating the solenoid, which remains activated until the key is withdrawn. Fig 3 shows a cross section thro A-A, and 4 details of the spring clip.
Drg 2- Fig 4. shows the inner face of an entrance door 1, frame 2. Bolt 3 is housed within solenoid 4, and is projected outward upon activation of the solenoid. A "U" shaped bracket 6 is secured to the frame, offset from the plane of the door,(fig 6). Retaining bar 7 is suspended from pivot 8. The bolt is shown in the neutral position (drawn full), and in the extended position (drawn dotted), between the frame and retaining bar when activated.
When the door begins to open, the bolt makes contact with the retaining bar pushing it to the horizontal until the key is withdrawn, allowing the bar to fall back to vertical. Failure to withdraw the key within a pre-set angular opening will result in the bolt being arrested by the hooked end until the key is withdrawn.
Fig 5 shows an end view as seen from the opening jamb, showing the profile of the retaining bar, and the bolt extended before opening.
Fig 6 shows a sectional plan from above the mounting bracket, showing the maximum opening possible with the key still inserted, and the offset angle between retaining bar and door to avoid losing contact with the bolt.

Claims (2)

  1. Claims 1 A system to prevent a keyholder from opening a night-latched door before removing the key, comprising-A nightlatch provided with a spring clip, a key which, when engaged with the dip, causes a solenoid-enabled bolt to engage with a pivoted retaining bar, which prevents the door from opening sufficiently to allow entry until the key is removed.
  2. 2 A system as specified in claim 1, substantially as the enclosed description and drawings.
GB1601831.9A 2014-01-30 2014-01-30 Preventing entry via nightlatch without removing key Expired - Fee Related GB2538829B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1601831.9A GB2538829B (en) 2014-01-30 2014-01-30 Preventing entry via nightlatch without removing key

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1401556.4A GB2522633A (en) 2014-01-30 2014-01-30 Preventing entry via nightlatch without removing key
GB1601831.9A GB2538829B (en) 2014-01-30 2014-01-30 Preventing entry via nightlatch without removing key

Publications (3)

Publication Number Publication Date
GB201601831D0 GB201601831D0 (en) 2016-03-16
GB2538829A true GB2538829A (en) 2016-11-30
GB2538829B GB2538829B (en) 2017-08-23

Family

ID=55590529

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1601831.9A Expired - Fee Related GB2538829B (en) 2014-01-30 2014-01-30 Preventing entry via nightlatch without removing key

Country Status (1)

Country Link
GB (1) GB2538829B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU182731U1 (en) * 2018-01-09 2018-08-29 Владимир Сергеевич Гапонцев SIGNAL DEVICE FOR LOCK OPENING CONTROL

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986376A (en) * 1975-04-01 1976-10-19 Sigo Lack Lock
US4048822A (en) * 1972-04-17 1977-09-20 Firma F. W. Luling Kg Locks for doors and the like
GB2221491A (en) * 1988-08-02 1990-02-07 Paul Walmsley A door latch
WO1997015034A1 (en) * 1995-10-19 1997-04-24 Guim R Key sensor alarm for door locks

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048822A (en) * 1972-04-17 1977-09-20 Firma F. W. Luling Kg Locks for doors and the like
US3986376A (en) * 1975-04-01 1976-10-19 Sigo Lack Lock
GB2221491A (en) * 1988-08-02 1990-02-07 Paul Walmsley A door latch
WO1997015034A1 (en) * 1995-10-19 1997-04-24 Guim R Key sensor alarm for door locks

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU182731U1 (en) * 2018-01-09 2018-08-29 Владимир Сергеевич Гапонцев SIGNAL DEVICE FOR LOCK OPENING CONTROL

Also Published As

Publication number Publication date
GB2538829B (en) 2017-08-23
GB201601831D0 (en) 2016-03-16

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20180130