A coil spring (100) includes a top portion (110) and a bottom portion (120). The top portion (110) includes three coils that are vertically stacked on top of each other to have a straight cylindrical shape in a side-view of the top portion (110). The three coils connect together such that no gap exists between the three coils in the side-view. The top portion (110) includes a top coil (115) that extends one and one-half turns along a flat plane as seen from a top-view of the top portion (110). The bottom portion (120) includes multiple coils that form a truncated-cone shape in the side-view and that in a compressed state extends one and one-half turns along a flat plane as seen from a bottom-view of the bottom portion (120).

A coil spring (100) includes a top portion (110) and a bottom portion (120). The top portion (110) includes three coils that are vertically stacked on top of each other to have a straight cylindrical shape in a side-view of the top portion (110). The three coils connect together such that no gap exists between the three coils in the side-view. The top portion (110) includes a top coil (115) that extends one and one-half turns along a flat plane as seen from a top-view of the top portion (110). The bottom portion (120) includes multiple coils that form a truncated-cone shape in the side-view and that in a compressed state extends one and one-half turns along a flat plane as seen from a bottom-view of the bottom portion (120).

The invention relates to a valve comprising a tubular body in which a valve stem moves axially, the head of the stem cooperating with a corresponding seat on the valve body, said stem acting against a coiled spring that is housed in a chamber of circular cross-section and disposed between a bearing zone at a first end of the chamber and the stem in order to return the stem to the seat, said spring comprising: a first end with a large turn of a diameter substantially identical to a diameter of the chamber at the first end; and a second end with a small turn connected to the shank or the head of the stem and a second large turn for centering and radial stabilization in the chamber.

The invention relates to a valve comprising a tubular body in which a valve stem moves axially, the head of the stem cooperating with a corresponding seat on the valve body, said stem acting against a coiled spring that is housed in a chamber of circular cross-section and disposed between a bearing zone at a first end of the chamber and the stem in order to return the stem to the seat, said spring comprising: a first end with a large turn of a diameter substantially identical to a diameter of the chamber at the first end; and a second end with a small turn connected to the shank or the head of the stem and a second large turn for centering and radial stabilization in the chamber.

A spring is provided that exhibits a variable and non-linear loading response upon compression. The spring comprises a continuous wire having a lower end convolution, an upper end convolution, and a plurality of helical intermediate convolutions. The upper end convolution, the lower end convolution, and the helical intermediate convolutions each have a respective diameter, with the continuous wire further defining a pitch between the various convolutions. In the spring, one or more of the diameters of the convolutions or one or more of the pitches varies along the length of the continuous wire such that the spring exhibits a non-linear loading response upon compression. A mattress is further provided and includes a plurality of the springs arranged in a matrix.

A spring is provided that exhibits a variable and non-linear loading response upon compression. The spring comprises a continuous wire having a lower end convolution, an upper end convolution, and a plurality of helical intermediate convolutions. The upper end convolution, the lower end convolution, and the helical intermediate convolutions each have a respective diameter, with the continuous wire further defining a pitch between the various convolutions. In the spring, one or more of the diameters of the convolutions or one or more of the pitches varies along the length of the continuous wire such that the spring exhibits a non-linear loading response upon compression. A mattress is further provided and includes a plurality of the springs arranged in a matrix.

A spring is provided that exhibits a variable and non-linear loading response upon compression. The spring comprises a continuous wire having a lower end convolution, an upper end convolution, and a plurality of helical intermediate convolutions. The upper end convolution, the lower end convolution, and the helical intermediate convolutions each have a respective diameter, with the continuous wire further defining a pitch between the various convolutions. In the spring, one or more of the diameters of the convolutions or one or more of the pitches varies along the length of the continuous wire such that the spring exhibits a non-linear loading response upon compression. A mattress is further provided and includes a plurality of the springs arranged in a matrix.

A spring is provided that exhibits a variable and non-linear loading response upon compression. The spring comprises a continuous wire having a lower end convolution, an upper end convolution, and a plurality of helical intermediate convolutions. The upper end convolution, the lower end convolution, and the helical intermediate convolutions each have a respective diameter, with the continuous wire further defining a pitch between the various convolutions. In the spring, one or more of the diameters of the convolutions or one or more of the pitches varies along the length of the continuous wire such that the spring exhibits a non-linear loading response upon compression. A mattress is further provided and includes a plurality of the springs arranged in a matrix.

A spring-loaded leg is shown along with a compatible rocking chair having the spring-loaded leg. The spring-loaded leg is composed of a lower cap, housing, spring and connection member. The connection member passes through the housing slide groove and is situated over the upper end of the housing spring. When connected to the chair frame, the spring-loaded leg provides a spring-like capacity for the frame and in combination with the fulcrum point of the support section, provides a controlled swinging or rocking motion for the chair.

A spring-loaded leg is shown along with a compatible rocking chair having the spring-loaded leg. The spring-loaded leg is composed of a lower cap, housing, spring and connection member. The connection member passes through the housing slide groove and is situated over the upper end of the housing spring. When connected to the chair frame, the spring-loaded leg provides a spring-like capacity for the frame and in combination with the fulcrum point of the support section, provides a controlled swinging or rocking motion for the chair.