Abstract: A weight bench may include a frame, a seat portion, and a back rest portion. The seat and back rest portions may be mounted to the frame using a hinge, allowing rotation between flat and inclined positions. The hinge may include first and second sliding limit hinges for the seat and back rest portions respectively. The seat and back rest portions may substantially abut along a common axis, with a gap of approximately zero. The sliding limit hinges may maintain a constant gap width as the portions rotate between positions. This configuration may allow for smooth adjustment while maintaining a seamless bench surface.

Abstract: An adjustable bench includes a bench frame, a seat support pivotably coupled to the bench frame at a pivot, and an adjustment mechanism. The adjustment mechanism includes an adjustment frame coupled to the seat support and defining a plurality of openings. A seat plate of the mechanism is coupled to a seat cushion. An adjustment pin is coupled to the seat plate and selectively engageable with the plurality of openings. A bearing is coupled to the seat plate and is slidably engaged with a rail coupled to the adjustment frame.

Abstract: An adjustable bench includes a frame, a back support frame pivotably secured to the frame, a back support pad secured to the back support frame, a back arcuate assembly connected to the back support frame and defining a plurality of back arcuate assembly apertures, and a back adjustment pin fixed to the frame. The back adjustment pin includes a plunger that may move between a projected position and a retracted position. In the projected position, the plunger may project into one of the plurality of back arcuate assembly apertures. Pivoting the back support frame in a first direction engages an angled first end of the plunger with one of the back arcuate assembly apertures and deflects the plunger towards the retracted position. Restraining the plunger in the retracted position enables pivoting the back support frame in a second direction.