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Chair having a synchronizing mechanismChair having a synchronizing mechanism description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080067848, Chair having a synchronizing mechanism. Brief Patent Description - Full Patent Description - Patent Application Claims
APPLICATION AREA OF THE INVENTION [0001] The present invention relates to a chair of the generic type having a substructure which is positioned on the floor and on which a synchronizing mechanism is mounted. The synchronizing mechanism has a fixed, horizontally running main rotary spindle and a horizontally running secondary rotary spindle which can be pivoted about the main rotary spindle. The synchronizing mechanism also has a fixed base which is intended for positioning on the substructure and through which the main rotary spindle runs. Arranged above the base is a pivotable seat carrier through which the secondary rotary spindle runs and on which a seat can be fastened. Articulated connecting means are provided between the main rotary spindle and the secondary rotary spindle. Further connecting means are provided opposite the secondary rotary spindle as a connection between the base and the seat carrier. A backrest is fastened on the synchronizing mechanism, which provides for synchronized movement between the seat and backrest, it being possible for the backrest to be pivoted about the fixed main rotary spindle counter to the resistance of a spring unit. The invention deals specifically with the compact construction and multiple functionality of the synchronizing mechanism within a chair designed therefor. PRIOR ART [0002] Synchronizing mechanisms, in particular for office chairs and other chairs for the workplace, have been used for many years now. The applicant therefore owns EP 0 592 369 B1, EP 0 839 478 B1, EP 1 039 815 B1 and EP 1 039 816 B1. A compact synchronizing mechanism has recently been proposed in EP 1 396 213. OBJECT OF THE INVENTION [0003] Based on the prior art which is already known in this respect, the object of the invention is to propose a chair of the generic type defined in the introduction which has an improved synchronizing mechanism, so that the basic construction is suitable for chairs of different configurations and levels or numbers of features. The intention is thus for mass production to be more efficient and, at the same time, for the functions to be further improved. OVERVIEW OF THE INVENTION [0004] The chair has, in the first instance, a substructure which is positioned on the floor and on which a synchronizing mechanism is mounted. The synchronizing mechanism has a fixed, horizontally running main rotary spindle and a horizontally running secondary rotary spindle which can be pivoted about the main rotary spindle. The synchronizing mechanism also comprises a fixed base which is intended for positioning on the substructure and through which the main rotary spindle extends. Arranged above the base is a pivotable seat carrier through which the secondary rotary spindle extends and on which a seat can be fastened. First connecting means are articulated, on the one hand, on the main rotary spindle and, on the other hand, on the secondary rotary spindle. Second connecting means are arranged opposite the secondary rotary spindle as a connection between the base and the seat carrier. A backrest is fastened on the synchronizing mechanism and can be pivoted about the fixed main rotary spindle counter to the resistance of a spring subassembly, the movements of the seat and backrest being synchronized in relation to one another. Characterizing is that the backrest having extensions which are fitted in a self-supporting manner on the first connecting means. [0005] The following features relate to specific embodiments of the invention: Two extensions which are spaced apart parallel to one another, and each have a first and a second retaining contour, are provided on the backrest. The first retaining contours are fitted on the secondary rotary spindle and partially engage from beneath here around a respective spindle element of the first connecting means. The second retaining contours butt against the first connecting means. [0006] In the state in which the backrest is inclined in the direction of the front seat edge, the first retaining contours on the extensions of the backrest can be fitted beneath the spindle elements of the first connecting means. As the backrest is pivoted back in the direction of the, in principle, vertical use position, the first retaining contours grip beneath the spindle elements in a claw-like manner, on the side which is directed toward the front seat edge, such that they slope upward from beneath. The second retaining contours are forced against the first connecting means by the torque generated by the weight of the backrest itself and the increase in this torque as the contact pressure against the backrest increases. The first connecting means are, in principle, two angle components, each angle component having the, in principle, cylindrical spindle element at the end which is associated with the secondary rotary spindle. A through-passage is present in the angle component, in front of the spindle element, and allows the first retaining contour to be fitted onto the spindle element. The second retaining contours on the extensions of the backrest are mating angles, each mating angle being supported on the associated angle component, engaging beneath the latter in the process. In order to secure the backrest fitted into the synchronizing mechanism, the second retaining contours on the extensions of the backrest are screwed on the angle components. [0007] An accommodating connector for the adjustable insertion of a carrying arm, which is a constituent part of an armrest, is provided laterally on the synchronizing mechanism in each case. It is possible to change the depth to which the free end of the carrying arm is pushed into the accommodating connector, as a result of which it is possible to adjust the span between the two armrests provided on the chair. The accommodating connector is designed as a sleeve component of, in principle, rectangular inner cross section, and the free end of the carrying arm is in the form of a sliding component. The sliding component contains a slot through which projects the shank of a clamping screw which engages in the accommodating connector and serves for fixing the selected span of the armrests. The accommodating connectors extend from the seat carrier. [0008] The spring subassembly in the synchronizing mechanism contains at least one mechanical spring and a pneumatic spring. The spring subassembly in the synchronizing mechanism advantageously comprises two helical springs and a pneumatic spring, the three springs being arranged in parallel. The pneumatic spring acts, in particular, as a damping member as the backrest is deflected into the rearwardly inclined position from its approximately vertical zero position. The prestressing generated by the spring subassembly can be set by means of an actuating member. [0009] The synchronizing mechanism also has: [0010] a) an arresting element for blocking the free synchronizing movement; [0011] b) an actuating device for selecting in a stepwise manner the depth to which the seat is extended in relation to the seat carrier; [0012] c) a device for setting a forward inclination of the seat carrier; and [0013] d) on the base, a vertical opening for the insertion of the outwardly extending outer tube of a height-specific pneumatic spring positioned vertically in the substructure; and [0014] e) a guide track as second connecting means between the base and the seat carrier, the seat carrier being displaced within the guide track during the synchronizing movement. [0015] A preferably elastic cover is provided for pulling over the backrest and as the essential constituent part of the latter, the cover being fixed in a releasable manner on a crossmember of the backrest by means of a cover holder. One end of the cover here is fastened on a base plate, which is arranged on the crossmember, while a second end of the cover is fastened on a latching plate, which can be fitted onto the base plate. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS [0016] In the drawings: [0017] FIG. 1A shows a front view of the chair according to the invention; [0018] FIG. 1B shows a side view of the chair according to FIG. 1A; [0019] FIG. 1C shows an exploded illustration of the chair according to FIG. 1A; [0020] FIG. 2A shows an enlarged perspective illustration of a synchronizing mechanism from FIG. 1C (without the spring subassembly); [0021] FIG. 2B shows an exploded illustration of the synchronizing mechanism according to FIG. 2A (with the spring subassembly); [0022] FIG. 2C shows a plan view of the synchronizing mechanism according to FIG. 2A (with the spring subassembly); [0023] FIG. 2D shows a perspective side view of the synchronizing mechanism according to FIG. 2C; [0024] FIG. 2E shows a perspective side view from the rear of the synchronizing mechanism according to FIG. 2C; Continue reading about Chair having a synchronizing mechanism... Full patent description for Chair having a synchronizing mechanism Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Chair having a synchronizing mechanism patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Chair having a synchronizing mechanism or other areas of interest. ### Previous Patent Application: Legless chair Next Patent Application: Apparatus and method for moving persons between a sitting and a standing position Industry Class: Chairs and seats ### FreshPatents.com Support Thank you for viewing the Chair having a synchronizing mechanism patent info. 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