Nakanishi has filed a patent for a counter balance device for sash windows. The device includes a spiral balance with a hand-wound spiral rod connected to a torsion spring, providing an initial spring force to counterbalance the window’s weight. A buffer spring with a larger spring force than the initial force allows the rotation shaft to tolerate the repulsion force generated by the torsion spring. GlobalData’s report on Nakanishi gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Nakanishi, ultrasound therapy was a key innovation area identified from patents. Nakanishi's grant share as of September 2023 was 48%. Grant share is based on the ratio of number of grants to total number of patents.
Counter balance device for sash window with spiral rod
A counter balance device for a sash window has been described in a filed patent (Publication Number: US20230265700A1). The device includes a pipe that extends along the window frame and houses a spiral rod with a screw portion. A coupling is rotatably disposed near the lower end of the pipe and has a slot through which the spiral rod is inserted and engaged. A torsion spring is secured to the coupling and the upper end of the pipe, applying an initial spring force corresponding to the window's weight. A slide block is connected to the window and slides along the window frame, while a rotation shaft is mounted on the slide block and connected to the lower end of the spiral rod.
When a large repulsion force generated by the torsion spring acts on the rotation shaft via the spiral rod, a buffer spring with a larger spring force than the initial spring force urges the rotation shaft in the opposite direction of the spiral rod's rotation, allowing for tolerance in the rotation of the shaft.
The buffer spring in the counter balance device is a coiled spring with two ends, one supported by the rotation shaft and the other supported by the slide block. The rotation shaft has a projection, and the slide block has two stoppers that control the range of rotation of the shaft by being spaced apart and facing each other with the projection in between.
In an alternative embodiment, the rotation shaft has a rotation hole in which a cylindrical portion of the shaft is rotatably mounted. The buffer spring in this embodiment is a coiled compression spring with one end bent upwardly and inserted in an opening in the rotation shaft, while the other end extends straight and is inserted in an opening in the slide block. The rotation shaft still has a projection, and the slide block still has two stoppers to control the range of rotation.
Overall, this counter balance device for a sash window provides a mechanism for balancing the weight of the window and allowing for controlled rotation of the shaft to ensure smooth operation of the window.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies
