Abstract: A triple-tooth weld-on hinge includes a cradle plate, connector spinal plate, crowfoot wrench, riveting pin, connector plate, and spring. The cradle plate, connector spinal plate, and crowfoot wrench are connected through the connector plate and secured with the riveting pin. The bottom is joined by the spring. The range of movement between the cradle plate and the connector spinal plate is between ?1-?2, or between 105° and 125°. The hinge can be used for securing furniture, particularly steel-framed sofas, as it allows for three angled adjustments between the seats and backs of the sofas. With the various insertion slots on the spinal plate, riveting piece, and cradle plate, the steel-framed sofas can be adjusted to different dimensions.

Abstract: A two-tooth hinge comprises a connector plate, riveting piece, crow foot wrench, spring, riveting pin, and cradle plate, etc. The connector plate and the cradle plate are connected through the riveting piece with the riveting pin and spring. The crow foot wrench is connected to the riveting piece with the riveting pin. The connector plate teeth are on the right side of the plate. The crow foot wrench falls into the grooves of the connector plate teeth. The riveting angle of the connector plate and cradle plate is between ?2-?1. The hinge can be adjusted at three angles and using the different holes in the connector plate, riveting piece, and cradle plate, the hinge can be adapted to various sofa dimensions.

Abstract: A triple-tooth weld-on hinge includes a cradle plate, connector spinal plate, crowfoot wrench, riveting pin, connector plate, and spring. The cradle plate, connector spinal plate, and crowfoot wrench are connected through the connector plate and secured with the riveting pin. The bottom is joined by the spring. The range of movement between the cradle plate and the connector spinal plate is between ?1-?2, or between 105° and 125°. The hinge can be used for securing furniture, particularly steel-framed sofas, as it allows for three angled adjustments between the seats and backs of the sofas. With the various insertion slots on the spinal plate, riveting piece, and cradle plate, the steel-framed sofas can be adjusted to different dimensions.