There is noticed a dynamic frame of the chair, which comprises a seat holder (1), to which a swivel sleeve (3) is demountably attached from one side, into which a spherical head (41) of a spherical thread swivel (4) with a threaded end piece (42) is tightly seated, to which a nut (7) is demountably attached and to which a silent block bushing (2) is demountably attached from the other side, to which an annular locking ring (6) with four locking undercuts (61) and four locking noses (62) is demountably attached from one side and a frame sleeve (5) with a sliding hole (53) and four sleeve noses (51) and four sleeve reinforcement pieces (52) is detachably fastened from the other side.

A double shell seat includes a base for resting on a floor, an outer shell supported by the base, and an inner shell movably supported within the outer shell. The inner shell has a seat support, a backrest support, and a hinge between the seat support and the backrest support. The inner shell is movable with respect to the outer shell from an upright condition in which the seat support has a position toward the rear of the outer shell, the backrest support has a position that is relatively vertical, and the hinge is at a first angle, to a reclined condition in which the seat support is forward of its position in the upright condition, the backrest support is less vertical than its position in the upright condition, and the hinge is open at a greater angle than the first angle. The seat is preferably free of coil springs.

A double shell seat includes a base for resting on a floor, an outer shell supported by the base, and an inner shell movably supported within the outer shell. The inner shell has a seat support, a backrest support, and a hinge between the seat support and the backrest support. The inner shell is movable with respect to the outer shell from an upright condition in which the seat support has a position toward the rear of the outer shell, the backrest support has a position that is relatively vertical, and the hinge is at a first angle, to a reclined condition in which the seat support is forward of its position in the upright condition, the backrest support is less vertical than its position in the upright condition, and the hinge is open at a greater angle than the first angle. The seat is preferably free of coil springs.

An orthopedic standing and walking aid and a method of supporting a person with such an orthopedic standing and walking aid. The orthopedic standing and walking aid comprises a carriage which is displaceably mounted on a running rail, an approximately C-shaped frame suspended from the carriage by a suspension device and a saddle which is arranged on the shaped frame approximately in linear alignment below the suspension device. The orthopedic standing and walking aid can be distinguished by a spring element arranged in the area between the carriage and the saddle so that the saddle is elastically supported in the vertical direction. The orthopedic standing and walking aid may also be distinguished by a height adjustment mechanism for adjusting the height of the saddle, which has a height adjustment spring element which exerts an upward preload on the saddle. This height adjustment mechanism can be designed to be lockable with one hand by means of a locking unit.

An orthopedic standing and walking aid and a method of supporting a person with such an orthopedic standing and walking aid. The orthopedic standing and walking aid comprises a carriage which is displaceably mounted on a running rail, an approximately C-shaped frame suspended from the carriage by a suspension device and a saddle which is arranged on the shaped frame approximately in linear alignment below the suspension device. The orthopedic standing and walking aid can be distinguished by a spring element arranged in the area between the carriage and the saddle so that the saddle is elastically supported in the vertical direction. The orthopedic standing and walking aid may also be distinguished by a height adjustment mechanism for adjusting the height of the saddle, which has a height adjustment spring element which exerts an upward preload on the saddle. This height adjustment mechanism can be designed to be lockable with one hand by means of a locking unit.

A stool can include a base including at least three legs with each leg including a non-slip member and a spring-loaded caster. A lower helical spring may be coupled to the base. A connecting member may comprise a first end coupled to the lower helical spring, a second end opposite the first end, and a central axis that extends between the first end and the second end. An upper helical spring may be coupled to the second end of the connecting member. A rotational joint may be coupled to the upper helical spring. A seat may be coupled to the rotational joint and configured to rotate about the central axis of the connecting member. The base, lower helical spring, upper helical spring, rotational joint, and seat may share a common vertical axis with the central axis of the connecting member when at rest.

A stool can include a base including at least three legs with each leg including a non-slip member and a spring-loaded caster. A lower helical spring may be coupled to the base. A connecting member may comprise a first end coupled to the lower helical spring, a second end opposite the first end, and a central axis that extends between the first end and the second end. An upper helical spring may be coupled to the second end of the connecting member. A rotational joint may be coupled to the upper helical spring. A seat may be coupled to the rotational joint and configured to rotate about the central axis of the connecting member. The base, lower helical spring, upper helical spring, rotational joint, and seat may share a common vertical axis with the central axis of the connecting member when at rest.

Provided is a chair for a ship with horizontality maintaining structure for preventing passengers on board the ship from getting motion sickness by maintaining the horizontality of the chair installed in cabins and the like in response to wobbles of the ship. The chair for a ship with horizontality maintaining structure according to the present disclosure includes an external frame 10 which is installed in a fixing way on the hull floor; an internal frame 20 which is integrated inside the external frame 10 so that it rotates back and forth; a seat unit 30 which is integrated inside the internal frame 20 so that it rotates from side to side; and a horizontality maintaining means 40 which is formed in the lower part of the seat unit 30.

A balance chair, comprising a seat, an in substance vertical height element supporting the seat, and a base supporting the height element and seat, distinctive in that the balance chair comprises a rotation and tilt element, arranged in a position in substance midway between the seat and a lower end of the base.

A guide spring for a seating device has an inner portion, an outer portion, and a spiral coiled portion extending more than one convolution between the inner portion and the outer portion. The inner portion is firmly attached to a rod and the outer portion is firmly attached to a body. The guide spring thereby secures a radial position of the rod within the body, allowing the rod to move axially relative to the body when a load is placed onto the seating device. When in use, the guide spring deforms from a flat spiral shape to a conical spiral shape with axial movement of the rod relative to the body.