Disclosed is a spring formed from a synthetic resin into one body, including: a plurality of annular members arranged in such a manner as to be coaxial with each other and spaced in parallel to each other; and elastic linkage members for linking the annular members to each other at a plurality of points. In the spring, each of the elastic linkage members is arranged along a virtual cylindrical face formed by the annular members and formed into a lying U-shape curved in the peripheral direction o...

A cylinder having a bore extending therethrough is formed with pairs of slits arranged axially of the cylinder at a predetermined spacing, the slits in each pair being opposed to each other diametrically of the cylinder. Like a coiled spring, the cylinder is adapted to perform a spring action against tension, compression or torsion.

A plastic spring element defined by inner and outer convolutions of different thickness defined by radii and with tapered walls extending therebetween.

A novel spring composed of a multiplicity of doubly arcuate plates (preferably hyperbolic parabaloids) which are attached together into a stack. The particular attachment means is for next adjacent plates to be attached to each other along a pair of opposite edges with each plate being attached to the plate before it and the plate after it by alternating opposite edge pairs (preferably 90.degree. apart).

A heavy-duty spring device with a series of axially arranged rigid outer rings and having resilient split inner rings sandwiched axially therebetween. The inner and outer rings have curved interacting surfaces whereby, upon the application of an axial force, the inner rings are compressed with the axial force being substantially absorbed.

A plastic spring having two longitudinal sides joined by transverse sides having curved portions. The upper and lower halves of the spring are symmetrical. Upper curved portions are disposed directly over lower curved portions to cause vertical deflection of the spring without horizontal roll in response to load. A mattress foundation utilizing such springs has border springs so mounted as to tend to slant outwardly but held in a vertical position by the foundation cover, thereby keeping the cov...

A spring spacer is provided to improve the durability of a spring, which is made of Ti or the like and low in surface hardness, by preventing abrasion With the spring spacer placed between a first turn and a second turn of a Ti spring, the spring spacer prevents an end of the first turn from contacting the second turn. The spring spacer includes a contact preventive portion that is interposed between the first turn and the second turn of the Ti spring to prevent the end of the first turn from co...

A spring seat with a supporting groove for the freely terminating end of a spring wire of a coil spring for an axle suspension of a motor vehicle. The supporting groove extends merely over a circumferential angular range of about 75.degree. to 120.degree.. The supporting groove is fashioned to be approximately V-shaped in cross section and the terminating end of the spring wire of the coil spring only contacts the flanks of the V-shaped supporting groove.

A sinuous spring strip is provided at one end with an extender spring which is positioned above and mounted on the spring strip. The extender spring consists of a wire body formed at its front end with a transversely extending bar adapted to support the usual border wire and at its opposite end with a hook that is engaged over one of the torsion bars in the spring strip. Intermediate at its ends, the wire body is formed with a transverse bar that is located on top of and is clipped to another on...

A spring assembly for an innerspring unit, particularly an innerspring mattress, is provided wherein at least a pair of springs are restricted about their adjacent offset portions of adjacent terminal convolutions in one surface of the assembly so that hinging action between the adjacent offset portions is allowed only to a maximum angle of deflection between the offset portions and thereafter, upon further loading, the pair of springs provide a greater resistance to loading than would be realiz...