A kind of Revolving chair chassis of self-return
The utility model relates to swivel chair, office chair technical field, particularly a kind of Revolving chair chassis of self-return.
Revolving chair chassis, also claims Revolving chair tray, is a vitals that is contained in swivel chair seat cushion below, the lifting of seat cushion, and the elevation angle of backrest regulates and all relies on chassis to complete.
Current Revolving chair tray is generally comprised of parts such as top tray, lower joist, rotating shaft and spring assemblies, and after top rotary table and swivel chair seat back are fixing, swivel chair can be done suitable reclining around the shaft, and can initiatively reply, and makes user have comfort.For example, Chinese patent discloses a kind of pallet, and (patent No. is: 02287885.8), mainly comprise base plate, sliding seat, conical pipe and adjusting device, sliding seat is movably connected in base plate, the conical pipe that connects air pressure rod in the middle of sliding seat is welded in sliding seat by Taper Pipe fixed head together with conical pipe; Described adjusting device includes adjusting rod, adjustable plate, torsion spring a, torsion spring a fixed head; adjusting rod interts in sliding seat; adjustable plate is fixedly connected on adjusting rod and inserts on the one end in sliding seat, the one side contact air pressure rod of adjustable plate, and another side is connected with torsion spring a; On the another side of adjustable plate, be provided with adjustable plate and stop blade.
The adjusting device of above-mentioned Revolving chair tray regulates by torque spring completely, and for the different people of body weight, the power of needed torque spring needs different, makes product there is no good versatility.For this problem, the patent No. is: the Chinese patent of " 201020264417.6 " discloses a kind of adjustable revolving chair tray of rolling shaft, its utilization is carried in the restoring force that the gravity conduction of seat surface is backrest, can substantially realize the people who meets different weight and use and do not need and regulate.But be sitting in when reclining is backward installed on the seat of above-mentioned pallet, because human body parts gravity is progressively increased by back rest supports and proportion, the gravity that is carried in seat surface is progressively diminished, the restoring force that gravity is transmitted to backrest diminishes thereupon, cause backrest restoring force deficiency when maximum reclining angle, restoring force too relies on the elastic recovery of elasticity reset device, therefore the crowd that is suitable for is limited in scope, the people that body weight is lighter is difficult to reclining, after the heavier people's reclining of body weight, be difficult to reply stand up, cannot reach Proper Match restoring force.
A kind of Revolving chair chassis of special research and development design, comprise connecting the base of gas bar, in order to the bracket of fixing seat support and in order to connect the seesaw of the chair back, bracket is arranged in base, seesaw is arranged in bracket, in the middle part of seesaw, be installed with the first bearing pin and seesaw take the first bearing pin as rotating fulcrum, the first bearing pin passes bracket and is connected with base, the bilateral symmetry of seesaw front portion is provided with first connecting rod, second connecting rod, one end of first connecting rod and seesaw front end are hinged by the 4th bearing pin, hinged and the 3rd bearing pin is connected with bracket by the 3rd bearing pin for the other end of first connecting rod and one end of second connecting rod, the other end of second connecting rod is installed with the second bearing pin and the second bearing pin passes or avoids being connected with base after bracket, in the bilateral symmetry of bracket, offer the rail groove in order to guide bracket movement locus coordinating with the first bearing pin, the first bearing pin is located in rail groove.
Above-mentioned chassis principle is to adopt four-point linkage mechanism, forms the conduction of power, and seesaw middle part is rotating fulcrum, overturns in seesaw rear portion under the effect of the chair back, and seesaw front portion is by linkage and bracket is hinged and prize obliquely bracket, makes bracket and seesaw form interlock; In this conducting structure, the chair back is connected and fixed on the driving force of seesaw as four-point linkage mechanism, the gravity that human body puts on seat support forms by the pin joint of four-point linkage mechanism and bracket the restoring force that is applied to four-point linkage mechanism, and the driving force of four-point linkage mechanism and restoring force form Antagonistic Relationship; Therefore restoring force relies on littlely to the elastic-restoring force of elasticity reset device, is suitable for crowd wider, and the lighter or heavier people of body weight like a cork reclining and reply stands up.
But in order to make chassis can bring into play its complete effect, and bracket, the chair back can in the situation that not leaning on the chair back, people be resetted, so need to make further design for the self-return on chassis.
Utility model content
The utility model has overcome existing deficiency in above-mentioned prior art, provides one can make chassis can bring into play its complete effect, and the Revolving chair chassis that can reset to bracket, the chair back when people does not lean on the chair back.
The technical solution of the utility model is achieved in that
A kind of Revolving chair chassis of self-return, comprise base, bracket and seesaw, bracket is arranged in base, seesaw is arranged in bracket, in the middle part of seesaw, be installed with the first bearing pin and seesaw take the first bearing pin as rotating fulcrum, the first bearing pin passes bracket and is connected with base, and seesaw front portion prizes movement of bracket by connecting rod; Described seesaw comprise two spaced and parallel side plate and connect two side plates and in order to connect the connecting plate of the chair back, connecting plate is positioned at outside base, on the bottom surface of base, be fixed with baffle plate, on the first bearing pin, be arranged with torsion spring, one of torsion spring turns round arm and baffle plate offsets, and another of torsion spring turns round arm and connecting plate offsets.
In order to facilitate sheathed torsion spring, as preferably, the first described bearing pin is one whole major axis.
As preferably, described torsion spring is 1～4.
Adopted principle of the present utility model and the beneficial effect of technique scheme to be:
The utility model because of seesaw be to be connected with bracket by connecting rod, and seesaw is synchronized with the movement with bracket, so sheathed torsion spring on the first bearing pin, a baffle plate of turning round arm and base of torsion spring offsets, the connecting plate that another of torsion spring turned round arm and seesaw offsets, when seesaw rotates drive movement of bracket, by the connecting plate extruding torsion spring of seesaw, make torsion spring produce the reply that elastic force is bracket restoring force is provided, simple in structure effective again.
Accompanying drawing explanation
Fig. 1 is the perspective view on chassis in embodiment.
The specific embodiment
The specific embodiment of the present utility model is as follows:
Embodiment: a kind of Revolving chair chassis of self-return, as shown in Figure 1, comprise connecting the base 1 of gas bar, in order to the bracket 2 of fixing seat support and in order to connect the seesaw 3 of the chair back, bracket 2 is arranged in base 1, and seesaw 3 is arranged in bracket 2; Seesaw 3 middle parts are installed with the first bearing pin 11 and seesaw take the first bearing pin 11 as rotating fulcrum, and the first bearing pin 11 is through bracket 2 and be connected with base 1; Seesaw 3 front portions prize bracket 2 by connecting rod and move, specifically, the bilateral symmetry of seesaw 3 front portions is provided with first connecting rod 13, second connecting rod 14, described first connecting rod 13 is to be obliquely installed towards the direction that approaches seesaw 3 from lower to upper, and described second connecting rod 14 is to be obliquely installed towards the direction that deviates from seesaw 3 from lower to upper.
One end of first connecting rod 13 and seesaw 3 front ends are hinged, by the 3rd bearing pin 15, hinged and the 3rd bearing pin 15 interts in bracket 2 in one end of the other end of first connecting rod 13 and second connecting rod 14, and the other end of second connecting rod 14 is installed with the second bearing pin 12 and the second bearing pin 12 through bracket 2 and is plugged in base 1; Because seesaw 3 drives bracket 2 to move by connecting rod, so the each symmetry in the both sides of bracket 2 offer the rail groove in order to guide bracket 2 movement locus (not shown) coordinating with the first bearing pin 11 and coordinate with the second bearing pin 12 in order to dodge the hollow slots (not shown) of the second bearing pin 12 when bracket 2 moves, offering of rail groove and hollow slots is also that the first bearing pin 11, the second bearing pin 12 can pass bracket 2, the first bearing pins 11, the second bearing pin 12 is located in respectively in rail groove and hollow slots in order to make.
Described seesaw 3 comprise two spaced and parallel side plate 44 and connect two side plates 44 and in order to connect the connecting plate 45 of the chair back, connecting plate 45 is positioned at outside base, on the base plate 4 of base, be fixed with baffle plate 46, the first bearing pin 11 is one whole major axis, on the first bearing pin 11, be arranged with torsion spring 43, turn round arm 47 for one of torsion spring 43 and offset with baffle plate 46, another of torsion spring 43 turned round arm 48 and offseted with connecting plate 45.