Abstract:
A posture holding apparatus including, a base onto which a substance is placed, a supporting member being attached onto the base so that the supporting member swings between a standby state and an active state, and a swinging support member having a returning force for returning the supporting member to the standby state, wherein the swinging support member is structured by a swinging member, a biasing member for applying a biasing force to the swinging member to the standby state, a liquid pressure output member for outputting liquid pressure in response to a weight of the substance, and a displacement amount adjusting member, with which a point of action of the biasing force applied from the biasing member to the supporting member is moved in response to the liquid pressure such that a distance from the pivot to the point of action changes.
Abstract:
A chair includes a chair body, a connecting member, a back portion, and a restoring device. The chair body includes a base having a receiving chamber. The restoring device includes a threaded adjusting sleeve rotatably mounted in the receiving chamber, a threaded rod screwed into the adjusting sleeve, a pull cord having a first end mounted on the connecting member and a second end mounted on the threaded rod, and an elastic member biased between the base and the adjusting sleeve. Thus, when the back portion is pressed, the connecting member is driven to pivot about the chair body so that the back portion is moved to adjust its inclined angle. In addition, the elastic member provides a damping force to damp a further movement of the back portion to limit the inclined angle of the back portion.
Abstract:
An office chair mechanism provided with a device for adjusting the swivel force includes a fixed part secured to the chair base, movable parts secured to the seating portion and to the back rest (22) of the chair, and an elastic element which opposes the weight of the chair user, a lever having contact surfaces which interact with said fixed part by means of a fulcrum having a movable contact element interposed between the end acting on the elastic element and the other end to which the movable parts are pivoted, and an adjustment element which causes only the movable contact element to move but without modifying the position of the elastic element and of the lever.
Abstract:
An adjusting mechanism is used to adjust a restoring force that acts on a backrest of a chair. The adjusting mechanism has a spring element for creating the restoring force, a support, and a backrest support that is pivotably mounted about a support axis on the support. An adjusting element configured as a pair of scissors containing a first scissor arm and a second scissor arm is provided, and the scissor arms are rotatably connected to each other about a scissor axis. The first scissor arm is pivotably mounted on the backrest support about an adjusting axis. A spring force produced by the spring element acts on the second scissor arm. A first actuating lever length is defined between the support axis and the scissor axis. The lever length is changeable using an adjusting element for adjusting the restoring force by pivoting the adjusting element about the adjusting axis.
Abstract:
A mechanism for an office chair having a backrest support which may be pivoted rearwardly. Adjustment of the backrest pivotal motion is accomplished by the mechanism having a base support which may be positioned on a chair column, a seat support, the backrest support which may be pivoted to the rear, and a pre-tensioned spring arrangement for enabling the mechanism to counter or oppose the movement of the backrest support. The seat support and the base support form a movable unit, which may be moved relative to the chair column depending on the weight of a user applying a load to the seat support. Movement of the movable unit causes an adjustment of the pre-tension of the spring arrangement and/or an adjustment of the spring constant of the spring arrangement.
Abstract:
An upper portion of the back is pivotable relative to the lower portion between a neutral position and an extended position, with the upper portion being pivotable relative to the lower portion independent of the tilt position of the back. In one aspect, an adjustment mechanism is coupled between lower and upper back support members and pivots the upper support member between at least first and second support positions.
Abstract:
A seating structure includes a central spine and an upper back structure having a pair of arms extending upwardly and outwardly from the central spine. The upper back structure is pivotally connected to the central spine about a first horizontal axis. A back support structure is pivotally connected to the spine about a second horizontal axis and is pivotally connected to the ends of each of the arms about a third horizontal axis.
Abstract:
An adjustable reclining chair including a seat configured to support a user, a chair back, a base and a control mechanism mounted on the base. The control mechanism coupling the chair back to the seat with the chair back located generally adjacent to the user's back when the user is seated upon the seat. The control mechanism including a resistance adjustment mechanism for varying the control mechanism's resistance to a reclining force applied by the user to the chair back in order to move the chair back rearward from an upright position. The resistance adjustment mechanism activated by the weight of the user when seated in the chair, such that easy adjustment of the resistance is facilitated with the chair in an upright position. The resistance adjustment mechanism including a resilient member placed under a load during reclining of the chair to provide resistance to the reclining force.
Abstract:
Adjustment device for chairs, comprising a back support capable of rotating around a shaft fastened to a support base, said support for the backrest being provided with a blocking plate having a plurality of openings, an insert capable of limited movement in a defined track in the support base to engage and disengage said openings, and an actuator connected to said insert, in which the actuator is operated by a rod connected to a handle that can be operated by the user, said actuator being movable between a release position and a lock position, in which said insert is selectively engaged in one of said openings.
Abstract:
A device for adjusting the elastic force exerted by a plurality of springs, wherein there are provided main springs and auxiliary springs connected to two mutually movable structures. There are provided means for operatively coupling or uncoupling the connection of the free end of one or more of the auxiliary springs with respect to at least one of the structures.