Abstract: A picture frame turn button has a base plate with at least one fastener for attaching the base plate securely to a picture frame back. Pivotably mounted to the base plate is a latch plate with an arm and a tongue portion opposite of each other. The latch plate may be pivoted about base plate between an engaged state, where the picture frame back is locked closed, and a disengaged state, where the picture frame back may be removed to replace a picture sandwiched between the picture frame and picture frame back.

Abstract: The self-locking hinge (24) includes a first plate (28) hingedly connected to a second plate (30). Fasteners (24) are provided on the plates to secure them to a member, such as a easel strut hinge (24) of picture frame back (20). A locking structure is connected to the first plate (28) and the second plate (30) for maintaining the second plate (30) in the substantially open position relative to the first plate (28). The locking hinge (24) includes a protrusion (36) on the first plate (28) that removably engages with a free edge (34) of the second plate (30). The hinge (24) also includes a structure for maintaining the second plate (30) in rotating arrangement with the first plate (28) when the plates (28, 30) are hingedly secured to one another in a rolled pinless fashion. Locking lugs (40) are used to maintained the second plate (30) rolled about the first plate (28).

Abstract: The improved pinless hinge assembly (24) includes a first hinge plate (28) having a curled edge (28a) defining a center roll having a longitudinal axis (P) with an aperture (42) in the first hinge plate (28). A second hinge plate (30) having a free edge (30a) curled about the center roll. A locking lug (40) extends from the free edge (30a) of the second hinge (30) and is routed first through the first aperture (42) in the first hinge plate (28) and then through the second aperture (44) in the second hinge plate (30). The locking lug (40) is engaged in a seat (46) in the second hinge plate (30) to maintain the free edge (30a) of the second hinge plate (30) curled about the center roll when the first hinge plate (28) rotates relative to the second hinge plate (30) about the longitudinal axis (P). A pair of locking lugs (40) may be also be used.