| 摘要 |
Seat furniture includes a frame which is adjustable such that the height and inclination of the seat supported by the frame can be easily and rapidly varied. The seat furniture includes a seat platform, which is supported by an adjustable frame, in which two pairs of legs are integrated, the height-adjustment devices of which have locking devices which are operated by operating elements located near the seat platform. When the front operating device is operated, the movable locking devices of the front pair of legs are released. The height of the front pair of legs can then be varied. The set of the corresponding rear elements functions in the same manner. Articulated hinges integrated in the frame permit each adjustment while the support area on the floor does not change. The adjustable frame is configured in such a way, in particular in regard to the rear legs and the frame braces, that a cavity remains for a stacking fit which is compatible with the shape and the dimensions of the seat platform and the other structural elements and the operating elements, and consequently several units can be stacked one on top of the other. |
| 主权项 |
1. Seat furniture with a quickly adjustable frame, the frame being adjustable such that a height and inclination of a seat supported by the frame can be easily and rapidly adjusted, comprising:
a seat platform, an adjustable frame that supports the seat platform, at least one group of legs integrated into the adjustable frame and which include devices for height-adjusting positions of the legs, operating devices for operating the devices for adjusting the positions, the operating devices being accessible from outside and the devices for height-adjusting the positions comprising locking devices that are operated by the operating devices, and two frame structures related to each other in a telescopic manner, the frame structures comprising:
an upper frame structure with four latched upper leg shafts inserted into a base frame structure with four lower leg tubes that accommodate the upper leg shafts,the lower leg tubes each having a locking mechanism on an upper opening thereof that can block or allow the pushing in or pulling out of the upper leg shafts,the upper frame structure having the seat and a chair back which are connected in a fixed manner, wherein axes that connect respective front and rear upper leg shafts which in turn can pivot in longitudinal direction are arranged below the seat area of the chair seat,the base frame structure having respective front and rear lower leg tube pairs which are connected in a rigid manner by a cross brace independent of the upper frame structure, while laterally the lower leg tubes are connected with blade-type longitudinal braces near the floor, the braces being fixed in a rigid manner in a front thereof but being connected to the leg tubes by hinges with longitudinal pivoting direction on a same plane in a rear thereof,the two frame structures forming a dynamic integral frame due to telescope-like sliding together of the shafts and tubes, the frame allowing for the adjustment of the chair with regard to height and inclination of the seat with a base area that remains the same, and a locking and operating mechanism comprising:
four locking devices that are suspended on hinges on the front or, respectively, rear outside edges of the upper openings of the lower leg tubes and having locking pins that are below level of the hinges and fall onto a latch profile of a respective upper leg segment, each yielding in reaction to a pulling out of the telescopic leg shafts from respective lower leg tubes and blocking a sliding back of the upper leg shafts into the respective lower leg tubes,each locking device carrying two lateral extensions on inside flanks thereof, the two lateral extensions being a lift extension at a top of the locking device and a locking extension at a bottom of the locking device,four operating levers connected in pairs by cross axes which in turn run in the cross braces of the base frame structure and which offer three operating positions in a vertical direction of movement with regard to the locking devices,the operating levers having lever arms below the seat that taper to the right and left in longitudinal directions of two axes thereof and have lever extensions that taper on another side of the axes towards an area between the lateral extensions of a respective locking device, wherein downward operation of the levers allows for a paired active opening by lifting of the locking devices while upward operation of the levers up to their highest position moves the load arms downward before the lower lateral locking extensions of the locking devices and blocks them completely in a position in a respective stage of the profile,the lateral extensions of the locking devices and the operating levers being aligned so that there is a neutral pivoting clearing for the levers between the lateral extensions of the locking devices which in turn provides the locking devices with free reaction clearance so that they can react passively to protrusion and retraction of the latch stages as soon as the upper leg shafts, which rub against the lock pins, are pulled out,spring tabs having spring pressure for pushing back the operating levers following operation in a direction of a complete open position into a center neutral position, andmechanical resistances that the operating levers must overcome in a frictional manner in order to get from the center neutral position to a position of complete blockage or, vice versa, to get from the total blockage position to the center neutral position, such that the operating mechanism allows for adjustment of height and inclination of the seat with at least one of one hand and one foot, and such that reaching of a position can be determined by at least one of a tactile, acoustic, and an optical manner. |
