The present invention relates to windows, and more specifically, to cam latching mechanisms for windows.
Double hung and other sliding sash type windows are very common. Typically, a latch or locking mechanism is used to secure the sashes in place to inhibit unintentional opening of the sashes and unauthorized entry to the structure.
One very common mechanism used to lock sashes together is the so-called check rail lock, which includes a sweep cam attached to a rotatable handle. The check rail lock is mounted on one of the sashes, usually the lower sash of a double-hung window proximate the center of the sash rail. A keeper structure is mounted on the other sash proximate the check rail lock. As the handle is rotated in either direction, the sweep cam is rotated into or out of engagement with the keeper in order to enable locking or opening of the window as desired. A drawback of these devices, however, is that the handle can be rotated so that the sweep cam is extended even when the sash is open. When the sash is closed with the sweep cam in such position, the extended position of the sweep cam prevents full closure of the sash. The operator of the window may not notice the window is not fully closed and latched. In addition, the sweep cam may strike and damage the other sash.
Another prior mechanism includes a sliding latch bolt that may be mounted on one sash and that is selectively engageable with a keeper mounted on the other sash. A drawback with these mechanisms, however, is often that the bolt must be held in a retracted position as the window is operated. In other case, where a mechanism for holding the bolt in a retracted position is employed, the bolt either releases as soon as the window is raised, or must be manually released with a separate catch or button. In such cases, the window may fail to close fully and may not be noticed by the operator of the window.
Some prior mechanisms have tried to solve the above problems, but the solutions focus on bolt latch. What is still needed is a simple and comfortable cam latch mechanism for a window that automatically latches when the window is returned to a closed position.
The present invention addresses the need of the industry for a simple and comfortable cam lock that automatically latches a window when the window is returned to a closed position. According to an embodiment of the invention, a window is equipped with an auto cam lock having a cam and a spring driven actuating mechanism in the housing of the window lock. The auto cam lock is mounted on a sash of a window assembly opposite a keeper or similar cam latch receiving structure. With the window in a closed position, the cam latch is received in the keeper to latch the sashes together, and the actuating mechanism is confined in a retracted position by the keeper. To open the window, the cam latch is disengaged from the keeper by rotating a handle and pulling outwardly away from keeper. The cam latch slides out of the keeper and goes into the housing, and the actuating mechanism is released by the keeper and extends outwardly from the housing and reaches an extended position. The cam latch is held in a retracted position by a stopping mechanism in the housing of the lock. With the cam latch in this position, the sash may be moved to open the window. To close the window, the sash with the auto cam lock is moved toward the keeper. The outwardly extending portion of the actuating mechanism contacts the keeper that pushes the actuating mechanism inwardly into the housing. The actuating mechanism actuates the cam latch and disengages the cam latch from the stopping mechanism. A spring urges the cam latch forwardly so that it is once again engaged in the keeper and the sashes are latched together as before.
According to one embodiment, a cam lock for a window includes a lock; a cam adapted to rotate between an extending position and a retracted position; a cam resilient means for giving the cam a resilient force adapted to drive the cam to rotate from the retracted position to the extending position; an actuator operatively coupled with the cam; and an actuator resilient means for giving the actuator a resilient force adapted to drive the actuator to move from the retracted position to the extending position.
Embodiments of the housing of the latch mechanism may include a top cover and a bottom cover. A hook mechanism and a post-hole mechanism are coupled with the top cover and the bottom cover. The top and the bottom covers can be held together in two steps. The first step is that the post-hole mechanism holds the top cover and the bottom cover together when the hook mechanism does not hold the top cover and the bottom cover. The second step is that the hook mechanism holds the top cover and the bottom cover together with the post-hole mechanism.
The advantage of this invention is a simple and comfortable solution for manufacturers and consumers to manufacture, assemble, install, and use an automatic cam latch for a window.
Top cover 108 further includes top cover shaft hole 122, top cover shaft hole breach 123, top cover spring hole 124, and an one-way pass element that can be resilient lobe 126. Top cover 108 further includes four top cover hooks 190, a pair of top cover post 192, top cover front wall 194, housing indicator window 187, and actuator fixing beam 196.
Base cover 110 includes rear wall 128, bottom wall 130, and a pair of side walls 132. Base cover 110 further includes base projection 140, a cam stop element that can be base stop post 134, base stop post stair 136, base actuator post 138, base cam stop pin 142, base cam hole 144, base cam spring hole 149, a pair of base cam hole breaches 146, and a pair of base cover holes 148. Base cover 110 further includes four base cover screw holes 184, base indicator window 186, cam hole edge 183, and four base cover hooks 188 (shown in
Cam 112 includes cam latch 150, cam groove 152, cam stop wall 154, cam actuate pin 156, can stop pin 157, cam stop pin arm 158, cam indicator arm 160, cam indicator 162, cam spring slot 164, and cam handle hole 166. Cam 112 further includes cam shaft 180 and a pair of cam shaft projections 182 (shown in
Cam receiver 104 includes receiver bevel wall 168 and a pair of receiver screw hole 170. Cam receiver 104 further includes receiver keeper 210 and receiver guide slot 212 (shown in
Cam spring 118 includes cam spring cam hook 172 and cam spring base hook 174. Actuator spring 120 includes actuator spring actuator hook 176 and actuator spring extension 178. Handle spring 116 includes handle spring handle hook 198 and handle spring cover hook 200 (shown in
One exemplary assembly process is shown in
Handle spring 116 is mounted on top cover 108, wherein handle spring cover hook grips top cover 108 by going through top cover spring hole 124. Handle spring handle hook 198 grips handle spring tab 208. Handle 106 is pushed toward top cover 108 wherein handle shaft 202 goes through top cover shaft hole 122 and wherein handle shaft projection 204 goes through top cover shaft hole breach 123. After handle shaft projection 204 goes through top cover shaft hole breach 123, handle 106 is rotated in clockwise, wherein handle shaft projection 204 moves away from top cover shaft hole breach 123, and wherein handle stop 206 passes resilient lobe 126. Handle shaft projection 204 moves away from top cover shaft hole breach 123 so that handle shaft projection 204 can hole handle 106 on top cover 108. Handle stop 206 can pass resilient lobe 126 because resilient lobe 126 is pushed centripetally by handle stop 206 and slides on handle stop 206 along handle stop bevel side 207. Once handle stop 206 passes resilient lobe 126, it cannot pass back since resilient lobe 126 resumes to its original position and blocks handle stop wall 205. Handle spring 116 is in a pre-tight state that gives handle 106 a counterclockwise torque, and handle 106 is rotated until handle stop 206 pushes against resilient lobe 126. These steps are shown in
The assembled cover is further mounted on the assembled base. Handle shaft 202 goes through cam handle hole 166. Handle shaft projection 204 goes into handle guide slot 214. Handle guide slot 214 is fan-shaped with two straight sides. Handle shaft projection 204 is adapted to move from one straight side to the other straight side when handle 106 rotates relatively to cam 112. Top cover posts are pushed into base cover holes 148. The lock body has two assembled states: semi-assembled state and final assemble state. In semi-assembled state, top cover hooks 190 rest on base cover hooks 188. In final assembled state, top cover hooks 190 are further pushed downward and top cover hooks 190 and base cover hooks 188 hold together. The assembled cover is relatively easy to be moved from the assembled base in semi-assembled state. Semi-assembled state is delivered from lock manufactures to window manufacturers for the purpose of mounting locks on windows. The assembled cover needs to be removed since screw holes 184 are on base cover 110. When the lock is mounted on the window, window manufacturers can further push the assembled cover down to the final assembled state. In final assembled state, the assembled cover is relatively difficult to be moved from the assembled base. The semi-assembled state and the final assembled state are shown in
The disclosed art can have different embodiments with various screw holes. Multiple screw locations increase the adaptability of this latch mechanism to many window systems, including but not limited to, sliding window systems and double-hung window systems. Those skilled in the art will also realize and understand, upon reading this description, that other and or different screw locations may be used to adapt this latch mechanism to various window systems.
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Number | Date | Country | |
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20110304163 A1 | Dec 2011 | US |