Sanwa has been granted a patent for a sliding door system that includes a motor, driveshaft, coupling mechanism, rotary encoder, and belt. The system ensures the movement of the sliding door is directly correlated to the movement of the coupling mechanism and rotary encoder, not the motor and driveshaft. GlobalData’s report on Sanwa 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 Sanwa, Tunnel Rescue/Safety Devices was a key innovation area identified from patents. Sanwa's grant share as of January 2024 was 35%. Grant share is based on the ratio of number of grants to total number of patents.

Sliding door system with motor, driveshaft, coupling mechanism, and encoder

Source: United States Patent and Trademark Office (USPTO). Credit: Sanwa Holdings Corp

A recently granted patent (Publication Number: US11885168B2) discloses a sliding door system that includes a motor, a driveshaft, a coupling mechanism, a rotary encoder, and a belt. The coupling mechanism converts the rotation of the driveshaft into linear motion of the sliding door, with the rotary encoder tracking the movement of the door independently of the motor and driveshaft. Control circuitry is also included to determine the position of the sliding door based on the output of the rotary encoder, allowing for speed adjustments based on the door's position.

Additionally, the patent describes a barrier operating system that shares similarities with the sliding door system, including a motor, driveshaft, coupling mechanism with a clutch, rotary encoder, and control circuitry. The clutch is designed to decouple the driveshaft from the movement of the barrier when a certain torque threshold is reached. The control circuitry in this system is responsible for adjusting the motor speed based on the position of the barrier, ensuring smooth operation as the barrier moves between open and closed positions. The inclusion of a belt and pulley system further enhances the functionality of the barrier operating system by facilitating the movement of the rotary encoder as the barrier and coupling mechanism move.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

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 across the world’s largest industries.