Patent Application
20100101148
The present invention relates to windows and more particularly, relates to a window operator such as is typically used in casement windows.
A casement window has a window sash which is moveably mounted within a frame by a pair of hinges mounted between the window frame the top and bottom of the window sash. Normally, the arrangement is such that one has a track mountable to the window frame and a sash arm connectable to the window sash. A support arm interconnects the track and the sash window with the support arm being pivotably connected to the sash arm and to the track. The sash arm is pivotably connected to a mounting shoe which is supported and guided for movement lengthwise of the track.
It is also known to provide an intervening link between the sash arm and the moveable shoe to provide for an offset sash arm. Such an arrangement typically includes a second intervening link between the support arm and the moveable shoe to provide further support.
Casement window operators are well known and typically include a hand crank which drives a worm gear arrangement which is connected to an arm or lever which pushes the window sash open. The worm gear assembly includes a gear shaft having the worm at one end thereof with the other end of the gear shaft extending outwardly through the housing to engage a crank. When the crank is turned, the worm causes the worm wheel to rotate and which in turn causes the sash to pivot on its hinges between open and closed positions.
As aforementioned, there are different opening arrangements for casement windows. A first type is a single arm operator which has an arm which pivots about an axis that is fixed with respect to the window frame and worm gear. The remote end of the arm carries a bearing which slides in a track mounted to the underside of the sash. A disadvantage with single arm operators is the torque required to move the sash towards its fully open position.
A second type of casement operator is the split arm variety. A split arm operator includes a second arm which has a pivot point in the middle of the second arm and the remote end of the second arm is secured through a pivotable mounting to a fixed point on the sash. While a split arm operator allows the window to extend to its fully open position, it does present difficulty at the time of the initial opening of the sash.
A third type of window operator is a dual arm operator which has one arm which rotates about a fixed axis and a housing which carries at its far end a bearing to slide in the track mounted to the window sash. There is also a second arm which has a pivot joint and which is secured at its remote end by a pivotable but fixed connection to the sash.
Many of the operators described above are relatively complex and difficult to assemble such that they will function in a reliable manner. A further problem in northern climates is the tendency of the operator to permit infiltration of cold air thus driving up energy costs.
It is an object of the present invention to provide a window operator which overcomes some of the disadvantages of the prior art.
According to one aspect of the present invention, there is provided an operator for a window comprising a base having a top and a bottom, the base having means for attachment to a window sash, an aperture extending through the base, an arm having first and second ends, the first end being secured to the base, the first arm having an aperture therein overlying the aperture in the base, an upper securement member extending at least partially through the aperture in the first end of the arm, the securement member having a threaded recess therein, a lower securement member screw threadedly engaged with the upper securement member and extending through the base in an abutting relationship thereto.
The operator is used with casement windows wherein the window is hinged on the side between the top and bottom of the window sash. The operator of the present invention may be utilized with a single arm, split arm or dual arm arrangement.
The operator preferably uses a worm wheel formed at a first end of an arm and which worm wheel is designed to engage a worm formed at one end of a shaft. The arrangement is such that the arm is secured to the base by upper and lower securement members which are screw threadedly engaged with each other. In this regard, the top securement member has a recess formed therein which is designed to receive the lower securement member. This arrangement allows the arm to be “drawn down” as the screw (bolt) is tightened.
The above arrangement allows the use of a monocoque housing secured to the base. The monocoque housing can, in colder climates, substantially reduce infiltration of cold air. Preferably sealing members are utilized to provide a substantially air tight enclosure.
For ease of operation, there is preferably provided a ball bearing at the end of the shaft having the worm such that ease of operation is enhanced.
In one embodiment of the invention, a locking mechanism is incorporated with the operator within the same housing. The locking mechanism preferably includes a lever which is connected to an actuator with a link extending between the acutator and a multi-point tie bar. The link preferably is associated with a plurality link guides for guiding the line along a predetermined path, and which predetermined path includes a turn through 90°.
Having thus generally described the invention, reference will be made to the drawings illustrating an embodiment thereof, in which:
a is a perspective view of the window operator;
b is an exploded view thereof;
a is a perspective view of a portion of the operator utilized with a double arm arrangement;
b is an exploded view thereof;
Referring to the drawings in greater detail and by reference characters thereto, there is illustrated in
Operator 16, as may be better seen in
Mounted on the upper side of base 18 are posts 22 and 24 for reasons which will become apparent hereinbelow. Base 18 also has a aperture 26.
In the illustrated embodiment, operator 16 includes a first arm 28 and a second arm 30. Arms 28 and 30 are conventional in the art of window operators. Arms 28 and 30 are secured by rivet 32.
Arm 28 has a first end generally designated by reference numeral 34 and forms a portion of a worm wheel 36, as is well known in the art. It will be noted that there is provided an aperture 33 in worm wheel 36 and which aperture 33 overlies aperture 26. A shim 38 is placed between worm wheel 36 and base 18.
An upper securement member 40 works in conjunction with a lower securement member 42 to secure arm 28 in position. In this regard, upper securement member 40 has a threaded recess which is designed to screw threadedly engage with threads 44 on lower securement member 42. In this arrangement, the lower securement member 42, upon tightening the same, draws upper securement member 40 downwardly into position to maintain a secure connection therebetween.
A shaft 46 has a worm 48 formed at one end thereof At the opposed end, there is provided a spur gear 50 and worm screw 57 which is designed to engage with a handle 51.
Shaft 46, at the end proximate worm 48, has a recess 52 which is designed to receive a ball bearing 54 to allow for easy turning of shaft 46. A thermal seal 56 is also provided to prevent the passage of air from the interior of operator 16.
Operator 16 also includes a monocoque housing 58 which has two internally threaded cylinders 60, 62 which are designed to receive screws 64, 66 passing through post 22 and 24 to thereby mount the base 18 to the monocoque housing 58.
Ideally, a sealing member 68 is provided for thermal sealing against sash 14.
Turning to the embodiment of
A first arm 108 includes a mounting aperture 110 formed therein. A second arm 112 has a second arm extension 114 as in the previously described embodiment. A mounting aperture 116 is formed in the center of worm wheel 118. A shim 120 is mounted between second arm 112 and first arm 108. As in the previously described embodiment, there is provided an upper securement member 122 and a lower securement member 124 which are screw threadedly engaged with each other.
In this embodiment, there is provided a second worm wheel 126 while as may be seen in
As may be seen in
Referring to the embodiment of
Operator 216 includes a base 218 having mounting apertures 220 formed therein. The operator also includes a first arm 222 and a first arm extension 224 along with a second arm 226, all as described in the previous embodiment.
As in the previously described embodiment, there is also provided a first worm wheel 228 and a second worm wheel 230. Worm wheel 230 is driven by a shaft 232 having a worm 234 at one end thereof and a spur gear 236 at the other end thereof. For ease of turning, a ball bearing 240 is located at the bottom of shaft 232.
The operator will include a housing 242 while in base 218, there is provided an arcuate slot 244.
An actuator 246 includes a U-shaped recess 248 designed to receive a pin 250 which extends through to slot 244. Connected to actuator 246 is a link 252 which passes through link guides 254 to be secured to tie bar 256.
Actuator 246 is operatively connected to an exterior lever 258 and an interior lever 260 which moves actuator 246 between locked and unlocked positions and shown in
It will be understood that the above described embodiments are for purposes of illustration only and that changes and modifications may be made thereto without departing from the spirit and scope of the invention.
