U.S. patent number 3,642,315 [Application Number 05/040,809] was granted by the patent office on 1972-02-15 for magnetic window lock.
Invention is credited to Alan Alpern.
United States Patent |
3,642,315 |
Alpern |
February 15, 1972 |
MAGNETIC WINDOW LOCK
Abstract
A magnetic window lock is disclosed for a window with a sash and
frame. The lock includes a first rod which is inserted in a channel
through one window sash and into a recess in either the window
frame or in the other window sash. In operation, the rod resides in
both the channel and recess to lock the window in a closed
position. In a preferred embodiment another rod magnetically
attractive to the locking rod is inserted into the channel to
remove the locking rod, and thereby free the window for
movement.
Inventors: |
Alpern; Alan (Brooklyn,
NY) |
Family
ID: |
21913076 |
Appl.
No.: |
05/040,809 |
Filed: |
May 27, 1970 |
Current U.S.
Class: |
292/144 |
Current CPC
Class: |
E05B
47/004 (20130101); Y10T 292/1021 (20150401) |
Current International
Class: |
E05B
47/00 (20060101); E05c 001/06 () |
Field of
Search: |
;292/251.5,144 ;70/90
;49/450 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Gilreath; Stanley N.
Assistant Examiner: McCarthy; Edward J.
Claims
What is claimed is:
1. A lock for a window comprising a channel formed through the sash
of the window, a member adjacent the sash, a recess in the member
adjacent the sash and aligned with the channel when the window is
closed, a magnetically attractable first rod insertable through the
channel and into the recess, the length of the rod being greater
than the length of the recess so that when the rod is inserted in
the recess a portion of the rod extends from the recess into the
channel to prevent relative movement of the sash and the member,
the overall length of the channel and recess being greater than the
length of the rod so that when the rod is inserted in the recess
the entire rod is recessed within the sash and member and a second
rod insertable into the channel to remove the first rod the second
rod being magnetically attractable to the first rod and at least
one of the rods being a permanent magnet.
2. A lock as defined in claim 1 wherein each of the rods have a
hole at one end, the edges of the hole being flush with the sides
of the rods to provide means for ready storage of the rod on a
support means without affecting movement of the rod in the
channel.
3. A lock as defined in claim 1 wherein at least one end of each of
the rods is marked to indicate the polarity of that end of the
rods.
4. A lock as defined in claim 1 wherein the length of the first rod
is greater than the length of the channel.
Description
BACKGROUND OF THE INVENTION
The present invention relates generally to window-locking devices
and more particularly to window-locking devices which use magnetic
parts.
A great variety of window-locking devices, both of the magnetic and
nonmagnetic type, have been described in the prior art. One of the
simplest types, disclosed in U.S. Pat. No. 370,235, Brady, issued
Sept. 20, 1887, uses a pair of sliding bolts connected at right
angles on the top of the lower window sash. One bolt engages a
recess in the window frame to keep the lower sash from moving while
the other bolt engages a groove in the upper sash to keep the upper
sash from moving relative to the lower sash. In Brady, both bolts
are spring-biased and none of the parts is magnetic.
Other nonmagnetic types of window locks, such as disclosed in U.S.
Pat. No. 532,935, Woolery, issued Jan. 22, 1895, disclose spring or
cam actuated bolts embedded in the sash and engageable with a
recess in the frame to prevent movement of the sash relative to the
frame.
Magnetic window retaining devices, such as disclosed in U.S. Pat.
No. 1,289,315, Thomas, issued Dec. 31, 1918, and U.S. Pat. No.
2,524,924, Pampallona, issued Oct. 10, 1950, use magnets which
coact with metal strips in the window frame. This type of device,
however, does not provide a secure lock and rather serves to retain
the window in a preset position.
It is the object of the present invention to provide a magnetic
locking device for a window sash and frame that is simple to use
and install and which is hidden from view.
It is a further object of the present invention to provide a
window-locking device that may not be simply disengaged or released
with one's fingers.
SUMMARY OF THE INVENTION
The window lock of the present invention includes a first rod
member that is inserted in a channel drilled horizontally through
the window sash. The rod projects through the inner end of the
channel and into a corresponding recess in either the window frame
or an adjacent window sash. The length of the rod is less than the
combined length of the channel and the recess so that when the rod
is inserted the outer end of the rod is recessed within the
channel. In operation, the rod resides in both the channel and
recess to lock the window in a closed position. Since the end of
the first rod is recessed within the sash, it may not be easily
removed with one's fingers and is not observable from the outside
so that a burglar would be unaware of where the rod is located if
he desired to cut through the window or otherwise render the lock
useless.
In a preferred embodiment of the invention the first, or locking
rod, is removed from the channel in the sash by means of a second
rod which is magnetically attractive to the first rod. In general,
either of the rods, or both, may be conventional permanent magnets
in order to provide the magnetic force to remove the locking rod
from the sash. In the case when only one of the rods is magnetic,
however, the other must be a magnetically attractive substance,
such as iron. For maximum flexibility it is preferred that both
rods be identical so that either may be used for locking while the
other is reserved to retrieve the locking rod.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an elevational view showing a window frame and upper and
lower window sashes equipped with the window-locking device of the
present invention;
FIG. 2 is a sectional view taken along the line 2--2 shown in FIG.
1;
FIG. 3 is a perspective view of the rod used in the locking device
of the present invention shown in FIG. 1; and
FIG. 4 is a sectional view taken along the line 4--4 shown in FIG.
1.
DETAILED DESCRIPTION
In FIG. 1, a pair of the present window-locking devices 10 are
shown in locking engagement between the window frame 12 and upper
and lower window sashes 14 and 16, respectively. The window frame
12 and sashes 14 and 16, shown in FIG. 1, are of the conventional
type wherein each sash moves in guides contained on each vertical
side of the window frame 12.
In accordance with the invention, the upper and lower sashes 14 and
16 have channels 18 and 20 which continue through the side of the
respective sashes on the indoor side of the upper and lower window
panes. The window frame 12 has recesses 22 and 24 which form
extensions of the channels 18 and 20 when the upper and lower
sashes are in closed positions. As will be appreciated from the
discussion below, it is preferred that the channels 18 and 20 and
recesses 22 and 24 be in substantially horizontal planes to insure
optimum functioning of the present locking device.
A pair of rods 30 of the type shown in perspective view in FIG. 3
are inserted through the channels 18 and 20 and into the
corresponding recesses 22 and 24. The rod in the channel 18 is
engaged in the recess 22 to lock the upper sash into position and
the rod in the channel 20 is engaged in the recess 24 to lock the
lower sash into position with respect to the window frame 12. Each
of the rods 30 has a length greater than the length of the recesses
22 and 24 to insure that each rod resides in both the recess and
its corresponding channel. Thus, both the upper and lower sashes
are locked by the use of two rods. It may be appreciated, however,
that either the upper or lower sash may be locked individually
through the use of a single rod in a corresponding one of the
channels 18 or 20.
The combined length of the channel 18 and recess 22 is greater than
the length of the rods 30 so that when one of the rods is inserted
in the channel 18 and recess 22 the rod is recessed within the
upper sash 14. Similar measurements hold for the channel 20 and
recess 24 associated with the lower sash 16. The fact that the rods
30 are recessed within the upper and lower sashes insures that they
may not be removed with one's fingers. In addition, because the
rods are recessed the position of each rod is hidden from view so
that a burglar cannot simply determine the position of each lock,
in order to cut through the window or otherwise render the lock
useless.
In a preferred embodiment of the present invention, the means for
removing the rods 30 from the channels 18 and 20 and recesses 22
and 24 is an identically shaped rod 31 which is magnetically
attractive to the rods 30 and which may be inserted into the
channels 18 and 20 to retrieve the rods 30. For maximum
retrievability, it is preferred that both the retrieving rod and
the locking rods 30 be permanent magnets to insure that there will
be sufficient magnetic attractive to retrieve the rods 30 from each
channel and recess. In general, however, it is only necessary that
one of the rods be a magnet if the other rod is magnetic, such as
iron.
Maximum flexibility is achieved when the retrieving rods 31 have
the same shape and length as the locking rod 30 and when all of the
rods are magnetic since in that case all the rods are suited for
use in the channels 18 and 20 and any of the rods may be retained
to retrieve the locking rods in the sashes. In addition, when all
the rods are identical, manufacture and packaging may be more
uniform and economical.
As shown in FIG. 3, the channels 18 and 20 and recesses 22 and 24
of the window shown in FIG. 1 are cylindrical. The rods 30 are also
cylindrical in order to conform to the cross-sectional shape of the
channels 18 and 20 and the recesses 22 and 24. It may be observed,
of course, that any shape may be used for either the channels, the
recesses or the rods so long as each rod is easily inserted within
a channel and serves to lock the window sash in position relative
to the window frame. The clearance between the rod and the channel
and recesses must be such that the locking rod may be removed by
the magnetic attractive force of the retrieving rod. As indicated
above, the channels 18 and 20 preferably are positioned in a
horizontal plane. This positioning insures that the rods will
remain in the locking position within the channel without the need
of a positive retaining force while at the same time being
retrievable from the channel with a minimum magnetic force.
Each of the rods 30 and 31 has a hole 32 through one end to permit
the ready storage of the rods on a conventional hook 34 near the
window frame, as shown in FIG. 1, when the rods are not in use. The
edges of the hole 32 are flush with the sides of the rod so that
there are no protrusions which affect the movement of the rod in
the channels 18 or 20. In the case when the rods 30 and the
retrieval rods are identically shaped magnets, the holes 32 may be
made on the ends of the rods which have the same magnetic polarity.
Thus, the hole 32 may serve, in addition, as an indicator for the
user to determine which ends of the rods will attract. The user may
then establish a convention for use of the rods so that a
predetermined end of the retrieval rod will always attract the
locking rod in the sash. Alternatively, each of the rod magnets may
have each end color coded to distinguish the positive and negative
ends so that the polarity of each end may be determined by color
even when the rod is inserted in the sash.
As may be seen for the conventional window sashes 14 and 16 shown
in FIG. 1 the top horizontal section of the lower sash 16 overlaps
the bottom horizontal section of the upper sash 14 when both
windows are closed. An alternative method by which the magnetic rod
30 may be used to lock the window sashes 14 and 16 is to provide
the top horizontal section of the sash 16 with a channel 36 and the
lower horizontal section of the sash 14 with a recess 38, as shown
in FIGS. 1 and 4. In this alternative the rod 30 resides in both
the channel 36 and the recess 38 to prevent relative movement of
the upper and lower window sashes when both windows are closed. The
rod 30 operates in the same manner in the channel 36 and recess 38
as the remainder of the rods 30, described above, except that the
use of a single rod residing in both the upper and lower sashes, as
shown in FIG. 4, serves to lock both windows instead of one. Thus,
the channel 36 and recess 38 may be used either singly with the rod
30 or to lock both windows together in conjunction with other rods
30 in the manner earlier described.
In conclusion, therefore, it may be seen from the above description
that a magnetic locking device is disclosed for a window sash and
frame that is easy to install and use and that is hidden from view
when in use. The present window lock, therefore, has the distinct
advantage that a burglar would be unaware of where the rod or rods
were located so that he could not simply render the lock useless.
Finally, the lock has the additional advantage that it does not
form an unsightly protrusion on the window sash which would tend to
have a displeasing aesthetic effect on the viewer.
* * * * *