U.S. patent number 3,844,066 [Application Number 05/379,041] was granted by the patent office on 1974-10-29 for tiltably-removable automatically-locking window sash.
This patent grant is currently assigned to Caldwell Manufacturing Company. Invention is credited to William Douglas Nobes.
United States Patent |
3,844,066 |
Nobes |
October 29, 1974 |
TILTABLY-REMOVABLE AUTOMATICALLY-LOCKING WINDOW SASH
Abstract
A tiltable and removable sash window, applicable to single or
plural hung sash designs, where the sash is pivotally mounted on a
vertically slideable slide block carried in a jamb channel, which
slide block is secured to a sash balancing mechanism and is
provided with a transverse bore having an out of round rotary
locking pin, and a resiliently flexible leg having a locking
surface with said channel, said locking surface being spaced away
from a line extending from the center of said rotating pin through
the point of contact of said rotating pin with said resiliently
flexible arm. As the sash is tilted, the rotating motion of the
sash is translated through a pivot bar to rotate the rotary locking
cam which moves the flexible arm of the sliding block into
engagement with the jamb channel thus securing the slideable block
at the point where the sash is tilted.
Inventors: |
Nobes; William Douglas
(Rochester, NY) |
Assignee: |
Caldwell Manufacturing Company
(Rochester, NY)
|
Family
ID: |
23495574 |
Appl.
No.: |
05/379,041 |
Filed: |
July 13, 1073 |
Current U.S.
Class: |
49/181;
49/446 |
Current CPC
Class: |
E05D
15/22 (20130101); E05Y 2900/148 (20130101) |
Current International
Class: |
E05D
15/16 (20060101); E05D 15/22 (20060101); E05d
015/22 () |
Field of
Search: |
;49/181,346 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Downey; Kenneth
Claims
1. A tilt-out window construction comprising a support frame having
a guide channel with an elongated opening,
a sash mounted for vertical movement in said frame which is pivotal
about an axis normal to said movement into a position extending out
of said support frame,
a sash balancing mechanism disposed in said guide channel, a
vertically slidable slide block mounted in said guide channel
connected to sash balancing mechanism said slide block having a
generally rectangular shape with means at the head for receiving
attaching means to the balance mechanism, and a transverse partial
bore therein integral with said block directed to said elongated
opening, said transverse partial bore having an out of round rotary
locking element with a camming surface rotatably journaled therein,
and a deformable, flexible leg integral with said slide block
extending from the head of said slide block and out of contact with
said slide channel, said deformable flexible leg having an
extension on one side with a locking surface for contacting said
side channel, said extension of said leg with said locking surface
being located in a position with respect to said rotating locking
element so that said locking surface is spaced away from a line
extending from the center of said rotating locking element through
the line of contact of said rotating locking element with said
resiliently flexible arm, said out of round rotary locking element
being connected to said sash and actuating said locking surface
into engagement with said channel in response to the tilting of the
window sash.
2. The tilt-out window of claim 1 wherein said rotary locking
element is actuated by a removable pivot bar and is rotated into
locking position by the tilting of the sash out of said support
frame.
Description
SUMMARY OF THE INVENTION
The flexiblle arm of the sliding block is so formed and positioned
that the locking surface with the jamb channel is tangential to the
camming surface of the rotary locking element, thus exerting a
relatively uniform force on the jamb channel regardless of
variations in the size of the jamb channel due to production
variances. This reduces the distortions heretofore formed in
similar mechanisms and results in a longer life and more secure
locking of the slide block upon the pivoting of the window sash.
Such a construction also permits its use in heavier sashes than has
heretofore been possible.
DESCRIPTION OF THE PRIOR ART
Heretofore, various means have been employed for engaging the
sliding block in the jamb channels so as to prevent movement after
the sash has been removed. However, all of these means have
utilized relatively fixed blocks which do not have a flexible leg
cooperating with the rotating cam so as to allow for variations in
the tolerances of the jamb channels. Examples of such blocks are
described in the following references:
L. E. Peters U.S. Pat. No. 3,055,062 L. E. Peters U.S. Pat. No.
3,146,501 R. J. Weidner et al., U.S. Pat. No. 3,434,236 D. M. Trout
U.S. Pat. No. 3,482,354.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front elevational view of a double hung window
illustrating the normal position of an upper sash and the pivoted
position of the lower sash;
FIG. 2 is an exploded perspective view of the mount of the present
invention showing also its relationship with the sash pivot
bar;
FIG. 3 is a perspective view of the mount of the present invention
showing rotary locking element in locking position;
FIG. 4 is a partial vertical cross-section through the window frame
of FIG. 1 along lines 4--4 showing the mount in use;
FIG. 5 is a horizontal cross-section along lines 5--5 of FIG.
4.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawings, with respect to FIG. 1, the window
consttuction comprises a conventional stationary frame 11 adapted
to be set into a building construction. The inner surface or jamb
of the frame 11 is provided with spaced walls 13 defining parallel
vertical guide channels 15 and 17 within which are respectively
hung window sashes 19 and 21, each having a glass pane 43. The
upper or rear sash 21 is shown in its normal vertical position. The
lower or front sash 19 is shown in its tilted pivoted position.
FIG. 1 shows the environment of the present invention, omitting
details of the frame, and the balancing mechanism, as well as other
structural details which may be considerd conventional. As for
balancing mechanisms, which may be used with the present invention,
any balancing mechanism will serve the purpose, including the cord
type balance mechanism as shown in the Dinsmore patent, U.S. Pat.
No. 3,358,404, or the spiral type as shown in the Tappan patent,
U.S. Pat. No. 2,580,705. Since windows are symmetrical in
construction, it is believed necessary to describe only one-half
thereof in detail. Consequently, only the details of one side of
the window are shown.
As shown in FIGS. 2, 3 and 4, slide block 20, which slides
vertically in guide channels 15 and 17, is of a generally
rectangular shape having a flexible leg 22 with locking surface 23
extending from head 24, which is attached to balance mechanism 31
through rod 32 and pin 33. Rod 32 and pin 32 extend through an
opening in head 24 and are secured into position in metal head
plate 25 of slide block 20. The metal head plate 25 serves as a
stiffener for head 24 and prevents distortion of head 24 from the
forces exerted by the balance mechanism 31. Slide block 20 also has
a transverse partial bore 26 for receiving rotary locking element
27, having a U-shaped opening 28 for receiving pivot bar 40. Side
29 of slide block 20 has two extending surfaces 35, 35' which
engage one side of channels 15 and 17 in frictional engagement when
the slide block is in locked position to secure said block in the
locked position.
Slide block 20 is preferably made of a plstic material and is
machined or otherwise smoothly finished, at least on its sliding
surfaces 35, 35', 36 and 23.
Rotary locking element 27 has an out of round camming surface 42
and is disposed in the transverse partial bore 26. Rotary locking
element 27 has an out of round cam surface 42 which interacts with
flexible leg 22 when the window is pivoted, as shown in FIG. 3.
It will be noted that locking surface 23 of leg 22, which
cooperates with the camming surface of the rotary locking element
27, is located in a position spaced away from a line extending from
the center of said rotating locking element through the line of
contact of said rotating locking element with resiliently flexible
leg 22. This provides a leveraged force which is applied against
the wall 13 of guide channel 15 and conversely by friction surface
35 and 35' of the other side of the slide block against the other
wall 13 of guide channel 15. This construction permits variations
in the tolerances of the guide channels 15 and 17 which inevitably
result from production variances. It also permits a wider tolerance
so as to prevent or eliminate any possibility of binding of the
slide block 20 during the operation of the window in normal
position. Further, it will be clear that the locking effect of a
slide block 20 of the construction of the present invention has an
added advantage of providing a cantilevered, spring lock. This
construction permits wider variation in the tolerances of the guide
channels.
As shown in FIG. 1, a finger operated sliding guide lock 50 is
shown which is of unique construction. This sliding guide lock
holds the window in position in the normal operating condition.
The operation of the locking slide block will be clearly understood
by reference to the drawings in which, as we have previously noted,
flexible leg 22 is free of locking contact with the walls 13 of
channel 15 and also permits the sliding of friction surfaces 35,
35' when the window is in the normal operating position. Upon the
unlocking of the sliding guide lock 50, the head rail is permitted
to be pulled out into the pivoted position as shown in FIG. 1. The
movement of the sash is transmitted through pivot bar 40 to the
rotary locking element 27 which exerts a leverage fore on flexible
leg 22 and pushes locking surfaces 23, 36, 35 and 35' into
engagement with the walls 13 of channel 15, thus holding the slide
block into the locked position while the window is in the
pivoted-out position for cleaning.
The provision of the flexible leg cooperating with the camming
surface of the rotary locking element permits a more rigid
construction of guide channels 15 and 17, since the locking action
of the block with the leverage force applied to the locking
surfaces do not rely upon the deformation of the walls 13 of
channels 15 and 17. A longer lasting and more uniformly operating
mechanism is provided. The locking mechanism of the present
invention, because of the greater leveraged force which may be
exerted upon the guide channel by the pivoting of the sash, permits
its use with heavier windows due to the greater efficiency of the
lock.
Thus, we have provided a sash lock and mounting block which
provides a simple and easily operable means for anchoring the
counterbalance and for securely locking the sash in pivoted
position. The device may be simply fabricated from plastic material
such as nylon or from any suitable metal and the balance bracket
may be of metal or aluminum. Of course, the window frame sash and
other parts may be of aluminum, wood, or other materials, as
desired.
While this invention has been described with reference to certain
features, structure, and material, it will be apparent that various
other modifications might be made without departing from the
principle and scope of this invention.
* * * * *