Did you know there are different chair springs?

Did you know there are different chair springs?

Coil springs, also known as biconical springs, play a crucial role in providing comfort, support, and shape to furniture. These springs are designed to be fastened securely onto different surfaces, including jute webbing, rails, or a wooden base. By anchoring the coil springs to these surfaces, they can effectively distribute weight and provide stability to the furniture piece.

To ensure the coil springs remain in their designated positions and maintain their functionality, it is common practice to tie the tops of the springs together using jute twine or sew them onto hessian fabric. This additional securing step prevents the springs from shifting or dislodging during use, allowing them to provide consistent support.

When it comes to sewing the jute webbing, using a large curved needle is recommended. This type of needle offers greater manoeuvrability and makes the sewing process more efficient. The curvature of the needle allows for easier access and stitching through the layers of webbing, ensuring a tight and secure attachment of the coil springs.

By employing proper techniques to fasten and secure coil springs, furniture manufacturers and upholsterers can enhance the durability and performance of their products. The secure attachment of the springs to the underlying surfaces ensures that they function optimally, providing long-lasting comfort and support to those who use the furniture.

Zig zag springs, known by various names such as sinuous, serpentine, or no-sag springs, are highly regarded for their exceptional support and durability in upholstered furniture.

When it comes to installing zig zag springs onto a furniture frame, a commonly used method involves the use of spring clips. These spring clips act as secure attachments, holding the zig zag springs firmly in position. By affixing the springs to the frame using these clips, they are able to withstand the weight and pressure exerted on the furniture during use.

One notable characteristic of zig zag springs is their length, which typically exceeds the width of the furniture frame. This deliberate design feature creates a subtle arch or crown shape within the springs. The purpose of this curvature is to distribute the weight more evenly across the entire seating area, ensuring a balanced and comfortable experience for the user.

To further enhance the stability and longevity of the zig zag springs, they are often tied together at two or three intervals using jute twine. This tying process helps to maintain the alignment and positioning of the springs, preventing them from shifting or sagging over time. By securely connecting the springs, they can work in unison to provide consistent support and minimise the risk of any individual spring becoming strained or weakened.

In addition to the tying process, a layer of hessian fabric, also known as burlap, is typically placed over the zig zag springs. This fabric acts as a protective barrier, shielding the springs from direct contact with the foam layer that will be added on top. By adding this layer of hessian, potential friction and wear between the springs and the foam are minimised, extending the lifespan of both components. Moreover, the hessian fabric contributes to the overall cushioning and comfort of the seating surface, ensuring a pleasant sitting experience.

Tension springs, frequently encountered in mid-century chairs, offer a distinct and specialised level of support that contributes to the overall comfort and functionality of these furniture pieces.

One notable characteristic of tension springs is their sizing in relation to the furniture frame. These springs are intentionally crafted to be approximately 10% smaller than the span of the frame. This deliberate design allows the tension springs to stretch across the frame when installed, creating a taut and supportive foundation. By exerting an inherent tension within the seating area, these springs effectively distribute weight and provide a reliable level of support to anyone seated on the chair.

When incorporating tension springs into furniture construction, the choice between a tight seat or a loose seat can influence the recommended approach for installation.

For a tight seat, where the foam and fabric are directly stapled onto the frame, it is advisable to cover the tension springs with a layer of hessian fabric before adding the foam layer. This additional hessian covering serves multiple purposes. Firstly, it acts as a protective barrier between the springs and the foam, minimising friction and potential wear over time. Secondly, the hessian fabric contributes to the overall stability and longevity of the seating by securely holding the tension springs in place.

On the other hand, for a loose seat that features cushioned seating, a different approach is taken. In this case, the tension springs should be covered with quilted lining. The quilted lining, often crafted with padded layers, provides a plush and comfortable seating experience. It also ensures that the tension springs remain securely in position, preventing any unwanted shifting or movement that could compromise the integrity of the seat.

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