CN2803630Y - Improved structure of ratchet tool - Google Patents

Abstract

The utility model relates to an improved structure of a ratchet driven tool. One end of a tool body of the ratchet driven tool is pivoted with a swinging connecting seat which has an angle bent function and an angle regulating function, and the outer end of the swinging connecting seat is assembled with a ratchet driven body. The ratchet driven body is composed of a ratchet driven seat and a screwing and pulling sleeve, wherein one end of a ratchet driven rod is provided with the ratchet driven seat which is used for containing two ratchet blocks and a spring in a screw mode, and the screwing and pulling sleeve is covered on the outer edge of the ratchet driven seat. The outer end of the ratchet driven rod sleeve is convexly provided with a driving and connecting section which is used for connecting a tool rod. The ratchet driven tool of the utility model can make the ratchet driven tool sheath one end of a screwdriver head for convenient and steady angular adjustment, and meanwhile, the assembly structure can be more simplified.

Description

The improvement structure of ratchet-driven tool

Technical field

The utility model relates to a kind of ratchet-driven tool, particularly a kind ofly can make the ratchet-driven tool assembling that angle bending adjusts, the improvement structure of using at spine move bottle opener one end.

Background technology

Be to promote the function of use of bottle opener instrument, people design the tool bar of a kind of front end in order to cover group screwdriver head or sleeve, thereby can do the angle bending when using.As shown in Figure 1 and Figure 2, though the bottle opener instrument that this kind is known can reach the purpose of lever bending, but because of its keeper is to utilize a pole 91 pivot groups, and for avoiding this pole to destroy other end lever back segment 92, so must imbed lever back segment 92 with irony iron plate 93 in addition, for pole 91 location, therefore, this bottle opener instrument correlated parts is many and make and must additionally make and imbed iron plate 93, and not only cost of manufacture is higher, and the assembling difficulty, fault rate is also higher.As Fig. 3, shown in Figure 4, another known creation is characterised in that, establish an elongated hole 941 in these instrument one lever leading portion 94 1 ends, and an axis hole 951 is established in lever back segment 95 opposite ends, utilize an axostylus axostyle 96 to wear this elongated hole 941 and axis hole 951 again, thereby be combined into one, these lever leading portion 94 external end edge appropriate locations are established a connecting hole 942 simultaneously, the inner edge of lever back segment 95 opposite ends is then established a projection 952, when lever leading portion 94 is done the angle bending, be arranged in connecting hole 942 places and locate by this projection 952, but because when lever is in the use form of angle bending, this lever back segment 95 also can't be made strong fix, and random dancing occurs, thereby cause the inconvenience in the use.

Therefore, at the shortcoming of above-mentioned known creation, need provide a kind of mechanism's improvement of ratchet-driven tool, to overcome the deficiency in the above-mentioned known creation.

Summary of the invention

The purpose of this utility model is to provide a kind of improvement structure of ratchet-driven tool, and that the structure that makes ratchet-driven bottle opener instrument one end turn bending as angle is formed is more exquisite, practical, firmly, and then promotes its efficient and quality in practical operation.

For achieving the above object, ratchet-driven tool of the present utility model comprises tool body, swing joint chair and spine move body, described tool body one end is provided with the lever that holds for the user, and other end group is provided with connecting base, and this connecting base front end forms an opening groove in order to pivot group swing joint chair; The pivot bonding part of described swing joint chair one end utilize a hinged arm to wear and the pivot group in this opening groove place, the other end forms the clamping chamber of hollow, in order to winding one spine move body; Described spine move body overlaps an end spiral shell group one spine move seat by a spine move bar, and cover in this spine move seat outer rim and to revolve dial sleeve and form, organize by this spine move seat one end cover again that group is established and is combined as a whole in the clamping of this swing joint chair is indoor, specifically be to cover portion's inner edge wall ring in the cover that this spine move bar overlaps the big footpath of an end to establish tooth portion, the other end is convexly equipped with in order to connect the driving of establishing tool bar and meets portion, this spine move seat is provided with a spring member, two ratchet module components, this two ratchets piece is subjected to spring push and the ratchet of one side is contacted as brake engaged with the tooth portion of this spine move bar cover, this revolves the ejection part that the relative appropriate location of dial sleeve inner ring surface forms depression, this ejection part is pushing tow ratchet piece when revolving the dial sleeve rotation, with the direction of conversion ratchet engagement blocking.

Ratchet-driven tool of the present utility model can also be designed to another and improve structure, and the ratchet-driven tool of this kind structure comprises tool body, connecting base and spine move body.Described spine move body is identical with the spine move body construction of above-mentioned first kind of structure; Described tool body one end is provided with the lever that holds for the user, other end spiral shell group one lid, and this lever ora terminalis place is formed with a wing hole, uses for a connecting base group and establishes; Described connecting base one end convexes with the wing post with this wing hole cutting ferrule, and the other end then forms the clamping chamber of hollow, in order to the above-mentioned spine move body of winding.

The improvement structure of the ratchet-driven tool that the utility model provides, can making ratchet-driven tool connect cover bottle opener first end, to make angle adjustment more easy, firm, and package assembly is more simplified simultaneously.

Description of drawings

Fig. 1 is the perspective exploded view of first kind of known creation;

Fig. 2 is that the combination of first kind of known creation is cutd open and shown schematic diagram;

Fig. 3 is the three-dimensional exploded view of second kind of known creation;

Fig. 4 is the combination section of second kind of known creation;

Fig. 5 is the three-dimensional exploded view of the utility model first embodiment;

Fig. 6 is the combination dissected figure of the utility model first embodiment;

Fig. 7 is another combination dissected figure of the utility model first embodiment;

Fig. 8 uses the form section to implement illustration for the utility model first embodiment is straight-bar;

Fig. 9 uses the form section to implement illustration for the utility model first embodiment is the angle bending;

Figure 10 promptly meshes the braking schematic diagram for the spine move body combination section of the utility model first embodiment;

Figure 11 had both meshed the braking schematic diagram for another combination section of spine move body of the utility model first embodiment;

Figure 12 is the three-dimensional exploded view of the utility model second embodiment;

Figure 13 is the combination appearance figure of the utility model the 3rd embodiment;

Figure 14 is the three-dimensional exploded view of the utility model the 3rd embodiment;

Figure 15 is the combination dissected figure of the utility model the 3rd embodiment;

Figure 16 promptly bends the enforcement illustration of an angle for the combination section of the utility model the 3rd embodiment;

Figure 17 is the three-dimensional exploded view of the utility model the 4th embodiment;

Figure 18 is the combination dissected figure of the utility model the 4th embodiment;

Figure 19 is another use form families cut-away view of the utility model the 4th embodiment.

Wherein:

Tool body: 10 levers: 11

Hollow inner edge: 111 wing holes: 12

Shifting block: 13 card ribs: 131

Flexible member: 14 swing joint chairs: 20

Pivot bonding part: 21 pivot holes: 211

Arc hole, location: clamping chambers 212: 22

Tangent plane portion: 213,214 wing holes: 23

Spine move body: 30 spine move bar covers: 31

Cover covers portion: 311 tooth portions: 312

Driving meets portion: 313 spine move seats: 32

Holding section: 321 shallow storage space: 322

Spring hole: 323 ccontaining hole slots: 324

Spacing teat: 325 axis holes: 326

Revolve dial sleeve: 33 dial holes: 331

Spacing alcove: 332 ejection parts: 333

Ratchet piece: 34 ratchets: 341

Spring: 35 connecting bases: 40

Connect axle: 41 opening grooves: 42

Slotted eye: 43 sleeve barrel tool heads: 44

Socket axle: 441 pivot cover portions: 442

Ratchet part: 443 wing posts: 45

Clamping chamber: 46 accommodation seats: 50

Storage tank: 51 lids: 52

Hole seat: 521 set sections: 53

Depression bar: 61 depressed parts: 611

Elastomer: 62 keepers: 63

Hinged arm: 64 tool bars: 65

Bullet spare: 71 steel balls: 72

Locking screw: 73 pivot posts: 74

Screwdriver head: 81 sleeves: 82

Adaptor: 83

The specific embodiment

Further specify structure of the present utility model and technology below in conjunction with drawings and Examples.Should be appreciated that the following example only is used to illustrate the utility model, and be not used in the scope of the present utility model that limits.

As Fig. 5～shown in Figure 11, the improvement structure of ratchet-driven tool of the present utility model is made up of a tool body 10, swing joint chair 20 and a spine move body 30, wherein:

These tool body 10 1 ends are provided with the lever 11 that holds for the user, the other end forms the connect spool 41 cover groups of a wing hole 12 usefulness for a connecting base 40 1 ends, and form a hollow inner edge 111 in this lever 11, can be for collection one accommodation seat 50, and this connecting base 40 other end moulding one opening groove 42, should swing joint chair 20 in order to the pivot group.These connecting base 40 1 side appropriate locations are provided with the slotted eye 43 of this opening groove 42 of connection again, can supply a depression bar 61, elastomer 62 and keeper 63 ccontaining, and these elastomer 62 1 ends are located in this depression bar 61, the other end then is resisted against this slotted eye 43 inwall places, and these depression bar 61 1 ends protrude this slotted eye 43, an end outer rim appropriate location that is positioned at this slotted eye 43 forms a depressed part 611, in order to drive this keeper 63 do protruding retaining, in position conversion such as contract.

The profile of this swing joint chair 20 is convex, and the one end convexes with the pivot bonding part 21 that is arc circle shape, and in order to this tool body 10 of pivot group, the other end then forms the clamping chamber 22 of hollow, in order to this spine move body 30 of winding.These pivot bonding part 21 center appropriate locations are formed with pivot hole 211, the outer margin arc-surface five equilibrium is equipped with arc hole, some location 212, during assembling, this pivot bonding part 21 is placed in this opening groove 42, utilize a hinged arm 64 to wear and combination again, make this keeper 63 be subjected to these elastomer 62 pushing tows simultaneously and compel to be stuck in 212 places, arc hole, arbitrary location, make this swing joint chair 20 can do the pivot location of different angles.

This spine move body 30 overlaps 31 1 end spiral shell groups, one spine move seat 32 by a spine move bar, and covers in these spine move seat 32 outer rims and to revolve dial sleeve 33 and form.Wherein this spine move bar cover of overlapping the big footpath of 31 1 ends covers portion's 311 inner edge wall rings and establishes tooth portion 312, and the other end is convexly equipped with in order to connect the driving of establishing tool bar 65 and meets portion 313.The end that 32 pairs of this spine move seats should be swung joint chair 20 convexes with polygonal holding section 321, the other end then is provided with between emptying 322 and one spring hole 323 between these two shallow storage space 322 in both sides, in order to supply two ratchet pieces 34 and a spring 35 ccontaining respectively, and make these two ratchet pieces 34 be subjected to spring 35 ejections, thereby overlapping 31 tooth portion 312, the ratchet 341 that makes its outside and this spine move bar contact as brake engaged.These spine move seat 32 apical margin appropriate locations are convexly equipped with a spacing teat 325 again, and outer rim appropriate location that should spacing teat 325 is drilled with a ccontaining hole slot 324, can be ccontaining for a bullet spare 71 and steel ball 72, and make these steel ball 72 1 ends protrude this ccontaining hole slot 324 and make resilient movement.This revolves dial sleeve 33 and is annular body, its internal ring wall is concaved with some adjacent dial holes 331 in the face of appropriate location that should steel ball 72, and the internal ring wall face of its relative this dial hole 331 is formed with a spacing alcove 332 that slightly caves in, and the ejection part 333 that is positioned at these spacing alcove 332 both sides.

When above-mentioned spine move body 30 is assembled, earlier this being revolved dial sleeve 33 covers in these spine move seat 32 outer rims, make this spacing teat 325 be arranged in this spacing alcove 332 places, and these steel ball 72 elasticity ejections are positioned arbitrary dial hole 331 places, be locked on screw 314 places that this spine move bar overlaps 31 inner edges after utilizing a locking screw 73 to wear the axis hole 326 of these spine move seat 32 axial inner edges again, thereby be combined into this spine move body 30.After holding section 321 covers of this spine move seat 32 are organized in the clamping chamber 22 of this swing joint chair 20, utilize a pivot post 74 to wear again and be combined as a whole with this swing joint chair 20.

This accommodation seat 50 is elongated rod shape, its axial outer edge surface suitably equidistantly is formed with some storage tanks 51, the terminal lid 52 that forms, can be provided with, locate for driving elements such as screwdriver head 81 or sleeves 82 in this storage tank 51, and along with the difference of screwdriver head 81, sleeve 82 profiles, this storage tank 51 also presents different structural forms.These accommodation seat 50 front ends can protrude out a set section 53 again, can supply an adaptor 83 sheathed location, and this adaptor 83 can be in order to socket screwdriver head 81.And when this accommodation seat 50 is concealed in the hollow inner edge 111 of this lever 11, can make this lid 52 establish mode in conjunction with being fixed in this lever 11 ends with spiral shell.

Above-mentioned member is formed, and the time spent that not only makes ratchet-driven tool one end make angle adjustment in order to the spine move body 30 that connects cover screwdriver head 81 is more exquisite, firm, and the while package assembly is also more simplified.

Below embodiment of the present utility model is done further narration.As Fig. 8, shown in Figure 9, when the spine move body 30 of spine move bottle opener instrument front end when linearly direction is used kenel with tool body 10, this keeper 63 compels to be stuck in 212 places, arc hole, location in these swing joint chair 20 centre positions, and when spine move body 30 desires are done the angle bending, then compressing this depression bar 61 breaks away from and the blocking relation of locating arc hole 212 this keeper 63, can make spine move body 30 do the bending of special angle, as shown in Figure 9, when power is eliminated outside depression bar 61 compresses, then drive keepers 63 and move to the location again, make this keeper 63 compel to be stuck in corresponding 212 places, arc hole, location and the location of making the angle pivot by this elastomer 62 pushing tow depression bars 61.Secondly, as Figure 10, shown in Figure 11, the transposing of these two ratchet piece 34 blockings engagement directions, only needing to dial changes this and revolves dial sleeve 33 and can finish.

As shown in figure 12, utilize above-mentioned member to form and to form second embodiment, it is characterized in that, thereby opening groove 42 places of the connecting base 40 of these tool body 10 front ends utilize this hinged arm 64 to wear group and establish a sleeve barrel tool head 44, this sleeve barrel tool head 44 front ends one side convexes with socket axle 441, the other end is the pivot cover portion 442 of projection one and these opening groove 42 pivot groups then, these pivot cover portion 442 external end edges are laid with ratchet part 443, just can do the urgent location of card and contact, the function that turns sleeve 82 be arranged thereby ratchet-driven tool is possessed with the keeper 63 in being located in this slotted eye 43.

Moreover, as Figure 13～shown in Figure 16, the 3rd example structure of the present utility model is: lever 11 front ends of this tool body 10 also can be designed to opening groove 42 structures, in order to directly to utilize hinged arm 64 to wear and this swing joint chair 20 of pivot group, and quantitative variation also can be done in the arc hole, location 212 of an end pivot bonding part 21 annular periphery face moulding of this swing joint chair 20, the other end inner edge of its relative this pivot bonding part 21 forms wing hole 23, in order to connect this connecting base 40 of group.These opening groove 42 inboard formation one are a section 421 of dialling of stage structure attitude again, can be installed with a shifting block 13, and between this shifting block 13 and this opening groove 42 internal faces, establish a flexible member 14, do the blocking engagement in order to these shifting block 13 1 ends of pushing tow card rib 131 that is convexly equipped with and the arc hole, location 212 of swinging joint chair 20 and contact, thereby form the different example structure that ratchet-driven tool one end is done the angle bending.In addition, the steadiness of angle orientation when bending for increasing this swing joint chair 20, the pivot bonding part 21 of this swing joint chair 20 is formed with some tangent planes portion 213,214 on its cambered surface, auxiliary spacing usefulness during as these swing joint chair 20 bendings, and lid 52 inner rings of these tool body 10 terminal spiral shell groups are provided with some holes seat 521, can plug placement for screwdriver head 81.

Based on above-mentioned the 3rd embodiment, can design the 4th kind of example structure of the present utility model again, as Figure 17～shown in Figure 19, it is characterized in that: these tool body 10 front ends are reshaping opening groove 42 not, and directly form wing hole 12, in order to connect this connecting base 40 of group, these connecting base 40 1 ends convex with the wing post 45 with these wing hole 12 cutting ferrules, the other end forms the clamping chamber 46 of hollow, overlap 31 in order to winding by the spine move bar, spine move seat 32, revolve dial sleeve 33, the spine move body 30 that members such as ratchet piece 34 and spring 35 are formed, thus the fixedly ratchet-driven tool of straight-bar use form formed.

In sum, structural design of the present utility model can effectively overcome the defective in the known creation, and has above-mentioned numerous advantage and practical value, thereby can promote the efficient and the convenience of ratchet-driven tool practicality.

Claims (15)

1, a kind of improvement structure of ratchet-driven tool is characterized in that, the formation of this ratchet-driven tool comprises:

One tool body, an end are provided with the lever that holds for the user, and other end group is provided with connecting base, and this connecting base front end forms an opening groove in order to pivot group swing joint chair;

One swing joint chair, the pivot bonding part of an end utilize a hinged arm to wear and the pivot group in this opening groove place, the other end forms the clamping chamber of hollow, in order to winding one spine move body;

One spine move body, overlap an end spiral shell group one spine move seat by a spine move bar, and cover in this spine move seat outer rim and to revolve dial sleeve and form, organize by this spine move seat one end cover again that group is established and is combined as a whole in the clamping of this swing joint chair is indoor, specifically be to cover portion's inner edge wall ring in the cover that this spine move bar overlaps the big footpath of an end to establish tooth portion, the other end is convexly equipped with in order to connect the driving of establishing tool bar and meets portion, this spine move seat is provided with a spring member, two ratchet module components, this two ratchets piece is subjected to spring push and the ratchet of one side is contacted as brake engaged with the tooth portion of this spine move bar cover, this revolves the ejection part that dial sleeve inner ring surface appropriate location forms depression, this ejection part is pushing tow ratchet piece when revolving the dial sleeve rotation, with the direction of conversion ratchet engagement blocking.

2, the improvement structure of the ratchet-driven tool described in claim 1, it is characterized in that, the other appropriate location of the side of this tool body is provided with the slotted eye of this opening groove of connection, be equipped with a depression bar in this slotted eye, elastomer and keeper, this elastomer one end is located in this depression bar, the other end is resisted against this slotted eye inwall place, and this depression bar one end protrudes this slotted eye, be positioned at this slotted eye one end outer rim appropriate location and form a depressed part, make protruding retaining in order to drive this keeper, in the evolution that contracts, should swing joint chair simultaneously along the equidistant arc hole, some location that forms of the ring circumferential surface of its pivot bonding part, when this swing joint chair and the winding of tool body pivot, this keeper is compeled the place, arc hole, location of this pivot bonding part of card.

3, the improvement structure of ratchet-driven tool as claimed in claim 1, it is characterized in that, this revolves dial sleeve internal ring wall face is formed with a suitable ring distance between this two ejection part spacing alcove, this spine move seat apical margin appropriate location is convexly equipped with a spacing teat, make this spacing teat be arranged in this spacing alcove place during assembling, dial and turn over head to avoid revolving dial sleeve.

4, the improvement structure of ratchet-driven tool as claimed in claim 1, it is characterized in that, this spine move seat outer rim appropriate location is drilled with a ccontaining hole slot, be equipped with a bullet spare and steel ball, this revolves dial sleeve and is concaved with some adjacent dial holes in its corresponding internal ring wall face appropriate location simultaneously, cover when being assembled in this spine move seat outer rim when this revolves dial sleeve, make this steel ball elastic positioning in arbitrary dial hole place, this revolves the position that dial sleeve drives this two ratchets piece conversion engagement direction in order to assist location.

5, the improvement structure of ratchet-driven tool as claimed in claim 1, it is characterized in that, the screw place that this spine move seat utilizes a locking screw to wear to be locked on this spine move bar cover inner edge behind the axis hole of its axial inner edge and combination, this spine move seat sees through the holding section cover that an end protrudes and organizes after the clamping of this swing joint chair is indoor, utilizes a pivot post to wear again and in conjunction with fixing.

6, the improvement structure of ratchet-driven tool as claimed in claim 1, it is characterized in that, hollow inner edge in this tool body lever has placed an accommodation seat, this accommodation seat is provided with some sleeve storage tank and bottle opener storage tanks for driving element screwdriver head or sleeve setting, the structure attitude of the storage tank on this accommodation seat is corresponding to the different types of driving element, this lever end is established a lid simultaneously, and this lid is locked on this shank end and locatees.

7, the improvement structure of ratchet-driven tool as claimed in claim 6 is characterized in that, is relative large-sized holding part and undersized holding part in order to the storage tank that installs sleeve by two and forms.

8, the improvement structure of ratchet-driven tool as claimed in claim 6, it is characterized in that, is one group and uniformly-spaced be located on this accommodation seat in order to the bottle opener storage tank of accommodating screwdriver head with some quantity, and this accommodation seat front end protrudes out a set section, use for the sheathed location of an adaptor, this adaptor one end establish can with the sleeve joint hole of the spine move head cover group of this tool body, and the other end forms the polygonal endoporus of sleeve screwdriver head.

9, a kind of improvement structure of ratchet-driven tool is characterized in that, the formation of this ratchet-driven tool comprises:

One tool body, one end are provided with the lever that holds for the user, other end spiral shell group one lid, and this lever ora terminalis place is formed with a wing hole, uses for a connecting base group and establishes;

One connecting base, an end convex with the wing post with this wing hole cutting ferrule, and the other end forms the clamping chamber of hollow, in order to winding one spine move body;

One spine move body, overlap an end spiral shell group one spine move seat by a spine move bar, and cover in this spine move seat outer rim and to revolve dial sleeve and form, organize by this spine move seat one end cover again that group is established and is combined as a whole in the clamping of this swing joint chair is indoor, specifically be to cover portion's inner edge wall ring in the cover that this spine move bar overlaps the big footpath of an end to establish tooth portion, the other end is convexly equipped with in order to connect the driving of establishing tool bar and meets portion, this spine move seat is provided with a spring member, two ratchet module components, this two ratchets piece is subjected to spring push and the ratchet of one side is contacted as brake engaged with the tooth portion of this spine move bar cover, this revolves the ejection part that the relative appropriate location of dial sleeve inner ring surface forms depression, this ejection part is pushing tow ratchet piece when revolving the dial sleeve rotation, with the direction of conversion ratchet engagement blocking.

10, the improvement structure of ratchet-driven tool as claimed in claim 9, it is characterized in that, this revolves dial sleeve internal ring wall face is formed with a suitable ring distance between this two ejection part spacing alcove, this spine move seat apical margin appropriate location is convexly equipped with a spacing teat, make this spacing teat be arranged in this spacing alcove place during assembling, dial and turn over head to avoid revolving dial sleeve.

11, the improvement structure of ratchet-driven tool as claimed in claim 9, it is characterized in that, this spine move seat outer rim appropriate location is drilled with a ccontaining hole slot, be equipped with a bullet spare and steel ball, this revolves the dial sleeve internal ring wall face appropriate location corresponding with it and is concaved with some adjacent dial holes simultaneously, cover when being assembled in this spine move seat outer rim when this revolves dial sleeve, make this steel ball elastic positioning in arbitrary dial hole place, this revolves the position that dial sleeve drives this two ratchets piece conversion engagement direction in order to assist location.

12, the improvement structure of ratchet-driven tool as claimed in claim 9, it is characterized in that, the screw place that this spine move seat utilizes a locking screw to wear to be locked on this spine move bar cover inner edge behind the axis hole of its axial inner edge and combination, this spine move seat sees through the holding section cover that an end protrudes and organizes after the clamping of this swing joint chair is indoor, utilizes a pivot post to wear again and in conjunction with fixing.

13, the improvement structure of ratchet-driven tool as claimed in claim 9 is characterized in that, the lid inner ring of the terminal spiral shell group of this tool body is provided with some hole seats of placing screwdriver head that plug.

14, the improvement structure of ratchet-driven tool as claimed in claim 9, it is characterized in that, this lever Front-end Design is an opening groove, in order to pivot group one swing joint chair, this swing joint chair one end is convexly equipped with the pivot bonding part that can be sleeved in this opening groove, utilize a hinged arm to wear this pivot bonding part and combine with tool body, the annular periphery face of this lever is formed with arc hole, some location, the other end inner edge of this pivot bonding part forms a wing hole, in order to connect this connecting base of group, the inboard formation one of this opening groove is a section of dialling of stage structure attitude, can be installed with a shifting block, and between this shifting block and this opening groove internal face, establish a flexible member, do the blocking engagement in order to this shifting block one end of pushing tow card rib that is convexly equipped with and the arc hole, location of stirring joint chair and contact.

15, the improvement structure of ratchet-driven tool as claimed in claim 14 is characterized in that, the pivot bonding part of this swing joint chair is formed with some tangent planes portion on its cambered surface, auxiliary spacing usefulness during as this swing joint chair bending.

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