Locks – Special application – For closures
Patent
1989-01-25
1990-11-27
Wolfe, Robert L.
Locks
Special application
For closures
70213, E05B 6500
Patent
active
049726919
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a latch for mounting on a movable frame of an openable door or window and which is co-operable with a corresponding keeper on a surrounding fixed frame in order to latch the movable frame to the fixed frame.
Window latches of the type commonly used in private houses normally have a pivoting handle which is mounted on the movable frame of an opening window, and which cooperates with a keeper mounted on a fixed part of the surrounding window frame. Often, in conjunction with the pivoting handle, there is provided a retainer stay which is pivotally mounted on the movable window frame and which can be engaged with one or more upstanding spigots or projections on the fixed frame in order to retain the window in any desired open position, or in a closed position in which case it supplements the latching in the closed position which is already provided by the pivoting handle.
It is known to provide so-called "window locks" in order to provide an additional safety lock for a closed window against unauthorised attempts at entry via the window. These window locks include locks which are separate from, and which do not cooperate with existing window handles or stays, these locks having a key-operated locking element which is mounted on the movable frame and which engages with a keeper e.g. a slit or hole, in the surrounding fixed frame. There are also key-operated window locks which cooperate with existing window stays so as to lock the stays in any predetermined position.
However, both of these types of window locks suffer from the disadvantage of requiring the use of a special key, and this ought to be kept in a safe place, but it is often the case that the key is left near to the window lock, e.g. on a window sill, ready for use, and therefore is readily available to an intruder after breaking the window glass from the outside.
It is therefore an object of the invention to provide a locking mechanism which can cooperate with a releasable latch of a door or window and which does not require the use of a special key.
Also, with the pivoting handle type of window latch, there is an elongate actuator arm for manual operation in order to operate and release a latching element (usually a plate or tongue from its keeper (a slot in the fixed frame), whereas with the pivoting retainer stay type window latch there is an elongate arm for manual operation in order to operate or release a latching element in the form of an apertured plate with respect to its keeper on the fixed frame, which comprises an upstanding spigot or projection.
Similarly, a door handle type latch has an elongate actuator arm for manual operation in order to operate and release a latching element, usually in the form of a spring loaded cam, with respect to its keeper in the form of a slot formed in the fixed frame.
Therefore, for the purposes of the present specification, the pivoting handle type latch for a window or door, and the pivoting stay type of window latch, will be referred to hereinafter as "a latch of the type specified", which will comprise an elongate arm, and a latching element engagable with a fixed keeper.
According to the invention there is provided a latch of the type specified for mounting on a movable frame of an openable door or window and which is co-operable with a corresponding keeper on or in a surrounding fixed frame in order to latch the movable frame to the fixed frame, in which the latch comprises a latching element which is movable into latching engagement with the keeper when the movable frame is in a closed position with respect to the surrounding fixed frame, a locking mechanism operable to lock the engagement of the latching element with the keeper, an elongate arm coupled with the latching element, and at least two combination wheels mounted on the elongate arm and arranged to control the operation of the locking mechanism so that the latching element can only be released from locking engagement with the keeper when a respective predetermined correct combination is set on each of the combinat
REFERENCES:
patent: 1434947 (1922-11-01), Freysinger
patent: 3667263 (1972-06-01), Rogers
patent: 3796072 (1974-03-01), Weeks
patent: 3903717 (1975-09-01), Rifkin
patent: 4050724 (1977-09-01), Nakanishi
patent: 4491354 (1985-01-01), Williams
patent: 4569213 (1986-02-01), Scelba
patent: 4763497 (1988-08-01), Nakai
Dino Suzanne L.
Lasky Michael B.
Wolfe Robert L.
LandOfFree
Window or door latch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Window or door latch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Window or door latch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1025232