| 摘要 |
The present invention relates to a spring apparatus for preventing sagging of a mattress for a bed. In particular, in order to reinforce the edge of a mattress, the spring apparatus comprises: a plurality of pocket springs; a parallel support rod supporting upper and lower end portions of the pocket springs; an edge spring including a support coil part which is formed on both end portions thereof and individually connected to the parallel support rod and an elastic coil part which is formed in an intermediate portion thereof to support an elastic force in the longitudinal direction of the pocket spring; and a truss spring including a connection support part which is formed on both end portions thereof and connected to the parallel support rod by a fixing member, an elastic support coil part which is formed in an intermediate portion thereof to provide an elastic force in the longitudinal direction of the pocket spring, and a connection part which symmetrically connects the connection support part and the elastic support coil part in the oblique direction. |
