CN208590625U - A kind of furniture folding stand - Google Patents

Abstract

The utility model discloses a kind of furniture folding stands, left folding component and right folding component including parallelogram structure, it is mounted on the inner fixed stand that hinged right folding component is used on furniture, the outer support part being used to support positioned at left folding component outer end, with be mounted on outer support part top for hinged left folding component external fixing rack, linkage rack between left folding component and right folding component for making left folding component and right folding component be connected, positioned at the lower section of left folding component and right folding component and the reinforcement assembly that is respectively articulated with left folding component and right folding component, movable diamond structure is formed after the reinforcement assembly and left folding component and right folding member hinges.The utility model furniture folding stand has many advantages, such as that structure is simple, solid, firm, receive it is folded quickly, conveniently, stability it is good, can be mounted on all kinds of furniture and use extensively, effectively save furniture and use and placement space.

Description

A kind of furniture folding stand

Technical field

The utility model relates to furniture part technical field, specially a kind of furniture folding stand.

Background technique

Fold furniture be make furniture when not in use by way of folding by furniture folding pack up, it can by volume compared with Big article compresses as far as possible, reduces its occupied space.Currently, fold furniture style moulding is various, but its majority is all independent Fold furniture, such as folding seat, folding table, Folding sofa, folding bed, the folding principle used is essentially identical, but its is a variety of Can not be general between different fold furnitures, individually it can only process and design, and it has a common characteristic, being all can be certainly By mobile independent household goods, do not have also at present it is a kind of can it is independent move the folding stand that used on articles and It, can also the folding stand that uses of independent activities furniture on wall type fitment.

Utility model content

It is simple, solid, firm that the utility model provides a kind of structure, receive it is folded quickly, conveniently, the advantages that stability is good, It can be mounted on all kinds of furniture extensively and use, and effectively save furniture and use the furniture folding stand with placement space.

The utility model can be achieved through the following technical solutions:

A kind of furniture folding stand, left folding component and right folding component including parallelogram structure, installation For the inner fixed stand of hinged right folding component on furniture, the outer support part being used to support positioned at left folding component outer end, and It is mounted on external fixing rack of the outer support part top for hinged left folding component, between left folding component and right folding component Linkage rack for making left folding component and right folding component be connected, positioned at the lower section of left folding component and right folding component And the reinforcement assembly being respectively articulated with left folding component and right folding component, the reinforcement assembly and left folding component and right folding Movable diamond structure is formed after member hinges.Wherein, the outer support part is the support frame or not foot wheel of foot wheel Support frame, the top of support frame is equipped with the external fixing rack for hinged left folding component, when left folding component and right folding stacked group When part is in a horizontal state in expansion, the external fixing rack and inner fixed stand for being used for hinged left folding component and right folding component are in Relative distribution.

The utility model furniture folding stand is mainly by the left folding component of parallelogram structure and right folding stacked group Part, inner fixed stand, external fixing rack, support frame and linkage rack are constituted, and whole components are constituted less, and structure is simple；Left folding stacked group Part, right folding component and make left folding component and right folding component formed the structure that is connected linkage rack setting, make to roll over It is superposed on during unfolding and folding and packing up, left folding component is with right folding component ganged movement, parallelogram The left folding component and right folding component of structure, the linkage by being located at intermediate linkage rack and upper universal driving shaft and lower universal driving shaft connect It connects, left and right foldable assembly forms ganged movement during the motion, and not only rugged construction, but also motion stabilization effectively ensures Folding stand unfolds and folds the stability of process；The setting of outer support part, it is interior solid for the support outside aftertable to be unfolded The setting for determining frame, for folding stand integral installation to be fixed on furniture fixed plate or fixed arm, the setting of the folding stand can Be widely used on all kinds of furniture, such as can be used for being mounted on and use on vertical computer desk as computer desktop, be also used as into Mouth shoe chest tip-up seat, independent fold-down seat hide dining table, and file cabinet hides desk etc., and versatility is good, widely used；Its Application method after being mounted on furniture is said for using as computer desktop specifically to be mounted on vertical computer desk It is bright, at this point, computer desktop is work top, in use, computer desktop is next in the drive of upper foldable assembly and lower foldable assembly It rises from top to bottom, extends expansion from inside to outside, when not in use, push outer support part inwards, computer desktop i.e. can be in upper folding Under the drive of stacked group part and lower foldable assembly from bottom to top, it receives and folds from outside to inside, until complete when computer desktop is in a vertical state Collapse, it is easy to use, and effectively reduce the occupied space of furniture, and its receive it is folded quickly, conveniently, stablize.

Further, the left folding component includes that lower-left folds arm and folds the workbench above arm, institute positioned at lower-left The left end for stating workbench and lower-left folding arm is hinged with the upper and lower part of external fixing rack respectively, and the lower-left folds the right end of arm By lower universal driving shaft and linkage rack lower hinge, the central bottom of the workbench is cut with scissors by the top of upper universal driving shaft and linkage rack It connects, the right end of the workbench stretches out linkage rack to the top of right folding component.

Further, the right folding component includes that upper right folds arm and bottom right folding arm, and the upper right folds arm and the right side Upper and lower part of the lower left end for folding arm respectively by upper universal driving shaft and lower universal driving shaft and linkage rack is hinged, and the upper right folds The right end that arm and bottom right fold arm is hinged with the upper and lower part of inner fixed stand respectively.

Further, the reinforcement assembly includes two reinforcing arms being hinged, the outer end difference of two reinforcing arms Fold arm and bottom right with lower-left and fold that arm is hinged, it is hinged after the completion of reinforcement assembly and lower-left folds arm, bottom right folds arm and under Universal driving shaft is formed together movable diamond structure.The setting of reinforcement assembly is combined together to form diamond structure with lower folding arm, It effectively avoids the problem that work top occurs shaking or deviate during being unfolded or receiving folded, further ensures that work top exists Expansion or the stability for receiving folded process.

Further, the external fixing rack, inner fixed stand and linkage rack are to be stamped to form using metal plate bending.Sheet metal component External fixing rack made of bending punching press, inner fixed stand and linkage rack, stiffness and strength are guaranteed, not cracky or fracture, into And effectively ensure the service life that furniture uses and the stability used.

Further, the external fixing rack includes outer stationary plates, and the both ends of the outer stationary plates are respectively equipped with bending and fix Portion, the bending fixed part are equipped with the fixation hole that is connected and fixed with outer support part, set that there are two simultaneously in the middle part of the outer stationary plates The outer pressing block that row is distributed and inwardly stretches out, the outer pressing block are equipped with hinge hole.

Further, the inner fixed stand includes internal fixation plate, and the internal fixation plate is equipped with two above and below outwardly directed Pressing block in layer, every layer includes at least two interior pressing blocks being distributed side by side, and the interior pressing block is equipped with hinge hole.

Further, the linkage rack includes linkage board, and the both ends of the linkage board are respectively equipped with bending linkage block, described Bending linkage block is equipped with upper layer and lower layer linkage hinge hole, and lower universal driving shaft, upper layer connection are rotatably connected in lower layer's linkage hinge hole Universal driving shaft is rotatably connected in dynamic hinge hole.

Further, the both ends of the upper universal driving shaft are respectively welded at upper right and fold on the side plate of arm, the upper universal driving shaft Centre be welded with the second linkage gear, second linkage gear and upper right fold arm and turn with upper universal driving shaft along linkage rack It is dynamic；The workbench central bottom is welded with the first linkage gear that connection is engaged with the second linkage gear, in the workbench Between stamp out the pressed sheets of two pieces with table vertical downwards, the first linkage tooth is welded with by fixing axle between two pieces of pressed sheets Wheel.When be turned on or off receive folded workbench when, the first linkage gear for being fixed on workbench bottom is produced with the movement of workbench Raw circular arc variation, and then the second linkage gear for engaging connection is driven to carry out the identical but contrary rotation of radian, have Effect increases the frictional force of left folding component and right folding assembly operating process, and then effectively ensures that workbench is being unfolded or is receiving to fold Stability in journey, meanwhile, it effectively prevent gliding because caused by workbench itself is overweight or is unfolded to open, it is ensured that workbench is received Poststack is reliable and stable.

Further, retarding spring is arranged on the upper universal driving shaft, the quantity of the retarding spring is two, and two subtract Fast spring be located at the two sides of the second linkage gear the second linkage gear and upper right fold arm side plate between, retarding spring with Adjusting nut is additionally provided between the side plate of upper right folding arm.The setting of retarding spring, the two sides of the second linkage gear respectively to Second linkage gear discharge opposite direction power, further increase the frictional force of the second linkage gear, it is ensured that workbench expansion and It is steady to receive folded process, the setting of adjusting nut, for stepping up or loosening the intensity of pressure of retarding spring.

The utility model furniture folding stand, have it is following the utility model has the advantages that

The first, structure is simple, and the utility model furniture folding stand is mainly by the left folding of parallelogram structure Component and right folding component, inner fixed stand, external fixing rack, support frame and linkage rack are constituted, and whole components constitute few, structure Simply；

The second, rugged construction, stability is good, left folding component, right folding component and makes left folding component and right folding Component formed be connected structure linkage rack setting, make folding stand unfold and fold pack up during, left folding stacked group Part is with right folding component ganged movement, the left folding component and right folding component of parallelogram structure, by being located at Intermediate linkage rack and upper universal driving shaft and lower universal driving shaft are connected, and left and right foldable assembly forms connection during the motion Dynamic movement, not only rugged construction, but also motion stabilization effectively ensure that folding stand unfolds and folds the stability of process；

Third, versatility are good, are widely used on all kinds of furniture, the setting of outer support part, for being unfolded outside aftertable The support in portion, the setting of inner fixed stand, for folding stand integral installation to be fixed on furniture fixed plate or fixed arm, the folding The setting of superimposed, can be widely used on all kinds of furniture, such as can be used for being mounted on and uses on vertical computer desk as computer desktop, It is also used as entrance shoe chest tip-up seat, independent fold-down seat hides dining table, and file cabinet hides desk etc., and versatility is good, It is widely used；

4th, using simple, conveniently, the application method after being mounted on furniture is specifically to be mounted on vertical computer desk On, it is illustrated for being used as computer desktop, at this point, computer desktop is work top, in use, computer desktop is in upper folding Under the drive of stacked group part and lower foldable assembly together from top to bottom, extend expansion from inside to outside, when not in use, push inwards Outer support part, computer desktop can be received from outside to inside and be folded under the drive of upper foldable assembly and lower foldable assembly from bottom to top, until Collapsed completely when computer desktop is in a vertical state, and its receive it is folded quickly, conveniently, stablize, using simple, conveniently；

5th, it occupying little space, the utility model folding stand is mounted on all kinds of furniture and uses, it can carry out from top to bottom, The expansion of from-inner-to-outer uses, and from it is lower and under, the folded setting of receipts from outer to inner spreads out when in use, does not make It is folded to reduce occupied space with that can be received, effectively save use space.

Detailed description of the invention

Attached drawing 1 is that horizontal use state when workbench is 0 degree of horn shape state in the utility model furniture folding stand is shown It is intended to；

Attached drawing 2 is that the expansion process or receipts when workbench is 45 degree of horn shape states in the utility model furniture folding stand are folded Process front schematic view；

Attached drawing 3 is that the expansion process or receipts when workbench is 45 degree of horn shape states in the utility model furniture folding stand are folded Process schematic rear view；

Attached drawing 4 be vertical receipts overlapping state when workbench is an angle of 90 degrees state in the utility model furniture folding stand just Face schematic diagram；

Attached drawing 5 is vertical receipts overlapping state back when workbench is an angle of 90 degrees state in the utility model furniture folding stand Face schematic diagram；

Attached drawing 6 is workbench hemisection status diagram in the utility model furniture folding stand；

Attached drawing 7 is the partial schematic diagram of the utility model furniture folding stand；

Attached drawing 8 is the decomposition diagram of the utility model furniture folding stand；

Attached drawing 9 is the structural schematic diagram of reinforcement assembly in the utility model furniture folding stand；

Attached drawing 10 is the structural schematic diagram of inner fixed stand in the utility model furniture folding stand；

Attached drawing 11 is the structural schematic diagram of external fixing rack in the utility model furniture folding stand；

Attached drawing 12 is the structural schematic diagram of linkage rack in the utility model furniture folding stand.

Specific embodiment

In order to make those skilled in the art more fully understand the technical solution of the utility model, below with reference to embodiment and Attached drawing is described in further detail the utility model product.

As shown in Figures 1 to 6, a kind of furniture folding stand, the left folding component 30 including parallelogram structure With right folding component 40, it is mounted on the inner fixed stand 50 for being used for hinged right folding component 40 on furniture, is located at left folding component 30 The outer support part 10 that outer end is used to support, and it is mounted on external fixing rack of 10 top of outer support part for hinged left folding component 30 20, for making left folding component 30 and right folding component 40 be connected between left folding component 30 and right folding component 40 Linkage rack 70, positioned at the lower section of left folding component 30 and right folding component 40 and with left folding component 30 and right folding component 40 The reinforcement assembly 60 being respectively articulated with, the reinforcement assembly 60 and the hinged rear formation activity of left folding component 30 and right folding component 40 Diamond structure.Wherein, the outer support part 10 is the support frame or the not support frame of foot wheel of foot wheel, support frame it is upper Portion is equipped with the external fixing rack 20 for hinged left folding component 30, when left folding component 30 and right folding component 40 are in expansion When being in a horizontal state, the external fixing rack 20 and inner fixed stand 50 for being used for hinged left folding component 30 and right folding component 40 are in phase To distribution.The utility model furniture folding stand is mainly by the left folding component 30 of parallelogram structure and right folding stacked group Part 40, inner fixed stand 50, external fixing rack 20, support frame and linkage rack 70 are constituted, and whole components are constituted less, and structure is simple； Left folding component 30, right folding component 40 and left folding component 30 and right folding component 40 is made to form the connection of the structure that is connected The setting of moving frame 70, make folding stand unfold and fold pack up during, left folding component 30 is with right folding component 40 Ganged movement, the left folding component 30 and right folding component 40 of parallelogram structure, by be located at intermediate linkage rack 70 with And upper universal driving shaft 412 and lower universal driving shaft 80 are connected, during the motion left and right foldable assembly 40 forms linkage fortune Dynamic, not only rugged construction, but also motion stabilization effectively ensures that folding stand unfolds and folds the stability of process；Outer support part 10 setting, for the support outside aftertable 31, the setting of inner fixed stand 50, for consolidating folding stand integral installation to be unfolded It is scheduled on furniture fixed plate or fixed arm, the setting of the folding stand can be widely used on all kinds of furniture, such as can be used for installing It being used on vertical computer desk as computer desktop, is also used as entrance shoe chest tip-up seat, independent fold-down seat hides dining table, File cabinet hides desk etc., and versatility is good, widely used；Its application method after being mounted on furniture is specifically with installation On vertical computer desk, it is illustrated for being used as computer desktop, at this point, computer desktop is 31 face of workbench, in use, Computer desktop together from top to bottom, extends expansion, no under the drive of upper foldable assembly and lower foldable assembly from inside to outside In use, inwards push outer support part 10, computer desktop i.e. can under the drive of upper foldable assembly and lower foldable assembly from it is lower to On, it receives fold from outside to inside, until collapsed completely when computer desktop is in a vertical state, it is easy to use, and effectively reduce house The occupied space of tool, and its receive it is folded quickly, conveniently, stablize.

As shown in Fig. 9 to Figure 12, the external fixing rack 20, inner fixed stand 50 and linkage rack 70 are to be rushed using metal plate bending It presses.External fixing rack 20 made of sheet metal component bending punching press, inner fixed stand 50 and linkage rack 70, stiffness and strength have guarantor Card, not cracky or fracture, and then effectively ensure the service life that furniture uses and the stability used.The external fixing rack 20 Including outer stationary plates 21, the both ends of the outer stationary plates 21 are respectively equipped with bending fixed part 22, set on the bending fixed part 22 There is the fixation hole 23 being connected and fixed with outer support part 10, is set in the middle part of the outer stationary plates 21 there are two being distributed and inwardly stretch out side by side Outer pressing block 24, the outer pressing block 24 be equipped with hinge hole 25.The inner fixed stand 50 includes internal fixation plate 51, described interior Fixed plate 51 is equipped with pressing block 52,53 in outwardly directed upper layer and lower layer, and every layer includes at least two interior punchings being distributed side by side Briquetting, the interior pressing block are equipped with hinge hole 54.The linkage rack 70 includes linkage board 71, the both ends point of the linkage board 71 Not She You bending linkage block 72, the bending linkage block 72 be equipped with upper layer and lower layer link hinge hole 73, lower layer link hinge hole It is rotatably connected to lower universal driving shaft 80 in 73, is rotatably connected to universal driving shaft 412 in upper layer linkage hinge hole 73.

As shown in Figures 3 to 8, the left folding component 30 includes that lower-left folds arm 32 and is located at 32 top of lower-left folding arm Workbench 31, the left end that the workbench 31 and lower-left fold arm 32 is hinged with the upper and lower part of external fixing rack 20 respectively, The right end that the lower-left folds arm 32 passes through lower universal driving shaft 80 and 70 lower hinge of linkage rack, the central bottom of the workbench 31 Top by upper universal driving shaft 412 and linkage rack 70 is hinged, and the right end of the workbench 31 stretches out linkage rack 70 to right folding stacked group The top of part 40.The right folding component 40 includes that upper right folds arm 41 and bottom right folding arm 42, and the upper right folds 41 He of arm Upper and lower part of the left end of bottom right folding arm 42 respectively by upper universal driving shaft 412 and lower universal driving shaft 80 and linkage rack 70 is hinged, The upper right folds arm 41 and the right end of bottom right folding arm 42 is hinged with the upper and lower part of inner fixed stand 50 respectively.The reinforcing Component 60 includes two reinforcing arms 61 being hinged, and the outer end of two reinforcing arms 61 folds arm 32 and bottom right with lower-left respectively Fold arm 42 hingedly, lower-left folds arm 32 and bottom right folds and is equipped with below one end that arm 42 is hinged by two reinforcing 61 phases of arm Reinforcement assembly 60 made of mutually hinged, two reinforcings arms 61 reinforce that articulated shaft 62 is hinged by first, outside two reinforcing arms 61 End passes through the second reinforcing articulated shaft 63,64 respectively, it is hinged after the completion of reinforcement assembly 60 and lower-left folds arm 32, bottom right folds Arm 42 and lower universal driving shaft 80 are formed together movable diamond structure.The setting of reinforcement assembly 60 is combined together with lower folding arm Diamond structure is formed, effectively avoids the problem that 31 face of workbench occurs shaking or deviate during being unfolded or receiving folded, further Ensure 31 face of workbench in the stability for being unfolded or receiving folded process.The both ends of the upper universal driving shaft 412 are respectively welded at upper right On the side plate for folding arm 41, the centre of the upper universal driving shaft 412 is welded with the second linkage gear 411, second linkage gear 411 and upper right fold arm 41 with upper universal driving shaft 412 along linkage rack 70 rotate；31 central bottom of workbench be welded with First linkage gear 311 of the second linkage gear 411 engagement connection, 31 centre of workbench stamp out downwards two pieces and work The vertical pressed sheet of platform 31 is welded with the first linkage gear 311 by fixing axle between two pieces of pressed sheets.When being turned on or off When receiving folded workbench 31, the first linkage gear 311 for being fixed on 31 bottom of workbench generates circular arc with the movement of workbench 31 and becomes Change, and then the second linkage gear 411 for engaging connection is driven to carry out the identical but contrary rotation of radian, effectively increases The frictional force of 40 operational process of left folding component 30 and right folding component, and then effectively ensure that workbench 31 is being unfolded or is receiving to fold Stability in journey, meanwhile, it effectively prevent gliding because caused by workbench 31 itself is overweight or is unfolded to open, it is ensured that workbench 31 receipts poststacks are reliable and stable.Retarding spring 413 is arranged on the upper universal driving shaft 412, the quantity of the retarding spring 413 is two A, two retarding springs 413 are located at the second linkage gear 411 of the two sides of the second linkage gear 411 and upper right folds arm Between 41 side plates, adjusting nut 414, the upper universal driving shaft are additionally provided between retarding spring 413 and the side plate of upper right folding arm 41 412 both ends are respectively equipped with screw thread corresponding with adjusting nut 414.The setting of retarding spring 413, in the second linkage gear 411 two sides to the power of the second linkage gear 411 release opposite direction, further increase rubbing for the second linkage gear 411 respectively Wipe power, it is ensured that the expansion of workbench 31 and the folded process of receipts are steady, the setting of adjusting nut 414, for stepping up or loosening retarding spring 413 intensity of pressure.

The above, the only preferred embodiment of the utility model not make in any form the utility model Limitation；The those of ordinary skill of all industry can be shown in by specification attached drawing and described above and swimmingly to implement this practical It is novel；But all those skilled in the art are not departing within the scope of technical solutions of the utility model, using the above institute The technology contents of announcement and the equivalent variations of a little variation, modification and evolution made, are the equivalence enforcement of the utility model Example；Meanwhile the changes of all substantial technological any equivalent variationss to the above embodiments according to the utility model, modification with Develop etc., within the protection scope for still falling within the technical solution of the utility model.

Claims (10)

1. a kind of furniture folding stand, it is characterised in that: including the left folding component of parallelogram structure and right folding Component is mounted on the inner fixed stand that hinged right folding component is used on furniture, is used to support positioned at left folding component outer end outer Supporting element, and it is mounted on external fixing rack of the outer support part top for hinged left folding component, it is located at left folding component and right folding Linkage rack between stacked group part for making left folding component and right folding component be connected is located at left folding component and right folding The lower section of component and the reinforcement assembly being respectively articulated with left folding component and right folding component, the reinforcement assembly and left folding stacked group Movable diamond structure is formed after part and right folding member hinges.

2. furniture folding stand according to claim 1, it is characterised in that: the left folding component includes that lower-left folds The left end that arm and the workbench above lower-left folding arm, the workbench and lower-left fold arm is upper with external fixing rack respectively Portion and lower hinge, the lower-left fold the right end of arm by lower universal driving shaft and linkage rack lower hinge, in the workbench Between bottom it is hinged by the top of upper universal driving shaft and linkage rack, the right end of the workbench stretches out linkage rack to right folding component Top.

3. furniture folding stand according to claim 1, it is characterised in that: the right folding component includes that upper right folds Arm and bottom right fold arm, and the upper right folds arm and bottom right folds the left end of arm respectively by upper universal driving shaft and lower universal driving shaft and connection The upper and lower part of moving frame is hinged, the upper right folds arm and bottom right fold the right end of arm respectively with the top of inner fixed stand and under Portion is hinged.

4. furniture folding stand according to claim 1, it is characterised in that: the reinforcement assembly includes two mutually hinges The reinforcing arm connect, the outer ends of two reinforcing arms fold arm and bottom right with lower-left respectively and fold that arm is hinged, it is hinged after the completion of plus Gu component and lower-left fold arm, bottom right folds arm and lower universal driving shaft is formed together movable diamond structure.

5. furniture folding stand according to claim 2, it is characterised in that: the external fixing rack, inner fixed stand and connection Moving frame is to be stamped to form using metal plate bending.

6. furniture folding stand according to claim 5, it is characterised in that: the external fixing rack includes outer stationary plates, The both ends of the outer stationary plates are respectively equipped with bending fixed part, and the bending fixed part is equipped with to be connected and fixed with outer support part Fixation hole is set in the middle part of the outer stationary plates there are two the outer pressing block for being distributed and inwardly stretching out side by side, is set on the outer pressing block There is hinge hole.

7. furniture folding stand according to claim 6, it is characterised in that: the inner fixed stand includes internal fixation plate, The internal fixation plate is equipped with pressing block in outwardly directed upper layer and lower layer, and every layer includes at least two interior punching presses being distributed side by side Block, the interior pressing block are equipped with hinge hole.

8. furniture folding stand according to claim 7, it is characterised in that: the linkage rack includes linkage board, described The both ends of linkage board are respectively equipped with bending linkage block, and the bending linkage block is equipped with upper layer and lower layer linkage hinge hole, lower layer's connection It is rotatably connected to lower universal driving shaft in dynamic hinge hole, is rotatably connected to universal driving shaft in upper layer linkage hinge hole.

9. furniture folding stand according to claim 8, it is characterised in that: the both ends of the upper universal driving shaft are respectively welded On the side plate that upper right folds arm, the centre of the upper universal driving shaft is welded with the second linkage gear, second linkage gear and Upper right folds arm and rotates with upper universal driving shaft along linkage rack；The workbench central bottom is welded with nibbles with the second linkage gear Close the first linkage gear of connection.

10. furniture folding stand according to claim 9, it is characterised in that: be arranged with deceleration on the upper universal driving shaft Spring, the quantity of the retarding spring are two, and two retarding springs are located at the second of the two sides of the second linkage gear Moving gear and upper right fold between arm side plate, are additionally provided with adjusting nut between retarding spring and the side plate of upper right folding arm.