The end shapes of compression springs are "closed end" and "open end."
The typical type is a closed end, where the tip of the coil at the end is in contact with the next coil. This single turn at the end is called a "seat coil" (zamaki). The seat coil serves to improve the stability of the spring when it is upright, but it does not have any functional role as a spring. The turns that function as a spring are those excluding the seat coil, and the number of turns that effectively function as a spring is referred to as the effective number of turns. The spring in the photo is an atypical "open end." The tip of the coil at the end is not in contact with the next coil, creating a gap (indicated by the arrow). The seat coils at both ends are less than one turn, resulting in fewer seat coils compared to a closed end. The reason for deliberately adopting a non-typical open end is mainly in the following cases: 1) When you do not want to change the spring constant (want to keep the effective number of turns fixed), and 2) When you want to keep the height at which the spring is in contact low (want to reduce the total number of turns). While reducing the seat coils may worsen the stability of the spring, it allows you to maintain the spring constant while keeping the contact height low.
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As a spring manufacturer, we will produce springs in a general shape, which is closed-end, unless otherwise instructed. Therefore, when adopting open-end springs, we recommend clearly stating this in your drawings or specifications. It is common to note on the drawings, "Both ends are open-end." If you have any questions or concerns regarding springs, please feel free to consult us. Our technical staff will respond carefully. Turuoka Spring Co., Ltd. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com
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Tsuruga Spring Co., Ltd. is a spring manufacturer located in Tsuruoka City, Yamagata Prefecture. We specialize in the design and manufacturing of coil springs, as well as wire forming processing. 1) Our strength lies in our ability to respond quickly from design to prototyping. Are you facing issues such as springs breaking, deforming, or being weak? Our technical staff will respond carefully, so please feel free to consult with us. It's okay even if you don't have drawings. 2) We can accommodate a wide range of wire thicknesses from 0.1mm to 10.0mm. We stock piano wire, stainless steel wire for springs, oil-tempered wire, and phosphor bronze wire. We can also handle special spring materials that are outside JIS standards, such as Herculite and SWIC. Additionally, we can accommodate wire diameters exceeding 10mm through outsourcing. 3) We accept orders from one piece to tens of thousands of pieces. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com Tsuruga Spring Co., Ltd. 〒997-0011 3-10-25 Takarada, Tsuruoka City, Yamagata Prefecture
