CN205707069U

CN205707069U - Foldable baby tricycle

Info

Publication number: CN205707069U
Application number: CN201620249182.0U
Authority: CN
Inventors: 庞明方
Original assignee: Taicang Chezhongbao Leisure Products Co Ltd
Current assignee: Taicang Chezhongbao Leisure Products Co Ltd
Priority date: 2016-03-29
Filing date: 2016-03-29
Publication date: 2016-11-23
Anticipated expiration: 2026-03-29

Abstract

A kind of foldable baby tricycle, including handlebar, folding stand, reducing sleeve, seat, front wheels, rear axle and two trailing wheels, handlebar is made up of two swan-necks and connector, folding stand is by front-axle beam pipe, tumbler, back rest pipe, upper slotware, lower slotware, rear axle tube, connect sheet and block piece is constituted, by front-axle beam pipe, tumbler, back rest pipe, upper slotware, the connection of lower slotware is combined into a folding four-bar linkage, tumbler is connected to the front side of front-axle beam pipe, rear axle tube is connected to the rear end of back rest pipe, connection sheet and block piece are connected to the rear end of slotware, seat connects with being connected sheet, two connecting rods of front wheels are socketed on the lower end of handlebar two swan-neck, front wheels are by front-wheel, crank shaft, two connecting rods and two pedals are constituted, rear axle penetrates in rear axle tube and two ends win, two rear wheel are socketed on the two ends of rear axle.

Description

Foldable baby tricycle

Technical field:

This utility model relates to a kind of RV, sits on the seat particularly to a kind of hip, and bipod is pedaled in rotation and stepped on foot The foldable baby tricycle pedaled and move ahead.

Technical background:

At present, market had the most not only been made with metal tube and but also unjointed child's bicycle, this is to produce this practicality Novel reason.

Utility model content:

The purpose of this utility model is to provide for a kind of novel process and makes, it is not necessary to the foldable baby three-wheel of welding Bicycle.The purpose of this utility model is achieved in that foldable baby tricycle, including handlebar, folding stand, turns Female connector, seat, front wheels, rear axle and two trailing wheels, is characterized in that: handlebar is made up of two swan-necks and connector, swan-neck be by One pipe upper end forms as right-angle bending, one end phase having the right-angle bending with swan-neck upper end up and down in the middle part of swan-neck Parallel two are to perforation, in the lower end of swan-neck, have mutually vertical to perforation with one end of the right-angle bending of swan-neck upper end, and two Two couple in the middle part of swan-neck is punched through two and is connected the perforation that lock bolt is horizontal with the two of connector, after being connected with connector Two swan-necks are positioned at the left and right sides of connector, the end of the right-angle bending of two swan-neck upper ends in laterally, two swan-neck upper ends End each noose one grip of right-angle bending；Folding stand include front-axle beam pipe, tumbler, back rest pipe, upper slotware, lower slotware, Rear axle tube, connection sheet and block piece, front-axle beam pipe is that to the back lower place, bending forms the bottom by a pipe, the leading flank of front-axle beam pipe The holes having one on the other, front-axle beam pipe has one horizontal to perforation to the knee of the back lower place, and front-axle beam pipe is to the back lower place The rear end of bending has one horizontal to perforation, and front-axle beam pipe holes one on the other is riveted with tumbler by two rivets, rotates Part is to be stamped to form by a flat bar sheet metal, and the upper and lower two ends of tumbler are in right-angle bending forward, before tumbler upward and downward The both ends of right-angle bending have mutual to perforation, are respectively arranged with a hole up and down in the middle part of tumbler, and on tumbler, noose one is transferred Set, tumbler right-angle bending both ends forward mutual to being punched through lock bolt, the vertical perforation with handlebar connector turns Be dynamically connected, back rest pipe be pressed into Ω type, leading section by a metal circular tube rear end before and after respectively to have one horizontal to perforation Becoming, back rest pipe has a vertical perforation intersected with back rest pipe Ω type front, the Ω-shape port of back rest pipe is used for penetrating rear axle tube, after The vertical perforation of beam pipe is for fixing penetrating rear axle tube therein, before upper slotware by holding lock bolt tightly by the Ω type of back rest pipe The left and right sides of end and the left and right sides at rear portion are respectively arranged with one mutual to perforation, are arranged with four before and after upper slotware upper side rear portion Hole, the front holes of upper slotware upper side longitudinal arrangement is riveted with being connected sheet by two rivets, upper slotware upper side longitudinal arrangement Rear holes is connected with block piece by two tap bolts, the front end of upper slotware mutual to being punched through locking bolt and front-axle beam Horizontal perforation is rotationally connected of pipe knee, the rear portion of upper slotware mutual to being punched through lock bolt and back rest pipe Previous horizontal be rotationally connected perforation of leading section, the lower left and right sides of slotware front end and the left and right sides of rear end are respectively arranged with a phase Mutual to perforation, lower slotware front end mutual to being punched through rotate perforation horizontal with front-axle beam pipe rear end of lock bolt is connected Connect, mutual rear horizontal rotate perforation being punched through locking bolt and back rest pipe leading section is connected in lower slotware rear end Connecing, seat is connected with being connected sheet by two pairs of bolt and nuts；Two connecting rods of front wheels are socketed on the lower end of handlebar two swan-neck, And with two, bolt and nut is positioned, front wheels are made up of front-wheel, crank shaft, two connecting rods and two pedals, and rear axle penetrates rear axle tube In and two ends win, two rear wheel are socketed on the two ends of rear axle.

The beneficial effects of the utility model are: this utility model have employed the production method of novel process, it is to avoid tradition Welding production mode so that manufacture of the present utility model is more efficient, cost is lower and environmental protection.

Accompanying drawing illustrates:

Fig. 1 is structural representation of the present utility model；

Fig. 2 is the schematic diagram of this utility model handlebar；

Fig. 3 is the schematic diagram of this utility model folding stand；

Fig. 4 is that this utility model draws schematic diagram in.

In figure: 1 handlebar, 2 folding stands, 3 reducing sleeves, 4 seats, wheels before 5,6 Rear axle, 7 trailing wheels；Wherein folding stand 2 also includes: 21 front-axle beam pipes, 22 tumblers, 23 back rest pipes, Slotware on 24,25 times slotwares, 26 rear axle tubes, 27 connect sheet, 28 block pieces.

Detailed description of the invention:

According to Fig. 1, Fig. 2 and Fig. 3, described foldable baby tricycle, including handlebar 1, folding stand 2, switching Set 3, seat 4, front wheels 5, rear axle 6 and trailing wheel 7；

Described handlebar 1 is formed by connecting by two swan-necks and connector, and described swan-neck is to be made directly by a pipe upper end Angular distortion forms, and has, in the middle part of described swan-neck, two paralleled in the one end with the right-angle bending of described swan-neck upper end up and down To perforation, the lower end of described swan-neck, have mutually vertical to perforation with one end of the right-angle bending of described swan-neck upper end, two institutes State two couple in the middle part of swan-neck to be punched through two lock bolt perforation horizontal with the two of described connector are connected, described connection Part is to be formed by plastic injection, and the left and right sides of described connector is respectively arranged with a vertical circular groove, the circle of described connector Arc groove is corresponding with the caliber of described swan-neck, and the upper and lower side that described connector is positioned in two circular grooves has two horizontal Perforation, horizontal perforation two couple upper and lower with in the middle part of described swan-neck of described connector two bores a hole corresponding, described connector Rear side have a convex backward to protrude, the convex of described connector has one vertically to bore a hole in protruding, and is connected with described connector After the swan-neck described in two be positioned at the left and right sides of described connector, and, the swan-neck described in two and described connector Two circular groove engagements, the end of the right-angle bending of swan-neck upper end described in two is in laterally, and described in two, swan-neck upper end is straight End each noose one grip of angular distortion.

Described folding stand 2 includes front-axle beam pipe 21, tumbler 22, back rest pipe 23, upper slotware 24, lower slotware 25, rear axle Pipe 26, connection sheet 27 and block piece 28, described front-axle beam pipe 21 is that to the back lower place, bending forms the bottom by a pipe, described The holes having one on the other of the leading flank of front-axle beam pipe 21, it is horizontal that described front-axle beam pipe 21 has one to the knee of the back lower place To perforation, the rear end that described front-axle beam pipe 21 bends to the back lower place has one horizontal to perforation, and described front-axle beam pipe 21 is one on the other Holes riveted with described tumbler 22 by two rivets, with described front-axle beam pipe 21 in the upper end pore of described front-axle beam pipe 21 Respectively being plugged with a plastics vexed plug of circle in the pore of rear end, described tumbler 22 is to be stamped to form by a flat bar sheet metal, described turn Moving part about 22 two ends are in right-angle bending forward, and the both ends of the right-angle bending before described tumbler 22 upward and downward have mutual To perforation, the two ends of the right-angle bending before described tumbler 22 upward and downward become fillet, the right angle before described tumbler 22 upward and downward Bending to open shelves corresponding with the height that the convex of described connector protrudes, be respectively arranged with a hole up and down in the middle part of described tumbler 22, Reducing sleeve 3 described in noose one on described tumbler 22, described reducing sleeve 3 is to be made of plastics, described reducing sleeve 3 in Ripple rectangular tubular, described tumbler 22 right-angle bending both ends forward mutual to be punched through to lock bolt, with described car The vertical perforation of 1 connector is rotationally connected.

It is horizontal that described back rest pipe 23 respectively has one before and after being pressed into Ω type, leading section by a metal circular tube rear end Perforation is formed, described back rest pipe 23 has a vertical perforation intersected with described back rest pipe 23 Ω type front, described back rest pipe The internal diameter of the Ω-shape port of 23 is corresponding with the external diameter of described rear axle tube 26, and described rear axle tube 26 penetrates in described back rest pipe 23 In Ω-shape port, described rear axle tube 26 is made up of a metal circular tube, being vertically punched through lock bolt of described back rest pipe 23 Hold tightly the Ω type of described back rest pipe 23 to fix and penetrate described rear axle tube 26 therein, in the front end pore of described back rest pipe 23 Being plugged with a plastics vexed plug of circle, described upper slotware 24 is the grooved stamping downward by the rammed notch of sheet metal, described upper groove The front end upper side of part 24 has U-shaped gap, the described upper left and right sides of slotware 24 front end and the left and right sides at rear portion to be respectively arranged with a phase Mutual to perforation, four holes are had before and after described upper slotware 24 upper side rear portion in longitudinal arrangement, described upper slotware 24 upper side is indulged Being riveted with described connection sheet 27 by two rivets to the front holes of arrangement, described connection sheet 27 is rammed by sheet metal Rectangle stamping, has downward flanging, has gap to the centre of lower hem before and after described connection sheet 27 before and after described connection sheet 27, Before and after described connection sheet 27, the gap width of flanging matches, on described connection sheet 27 with the grooved width of described upper slotware 24 All around being respectively arranged with the hole of a upward and downward, before and after described connection sheet 27, holes is riveted holes, the left and right of described connection sheet 27 Holes is the connecting hole with seat, and the rear holes of described upper slotware 24 upper side longitudinal arrangement passes through two tap bolts with described Block piece 28 connects, and described block piece 28 is the right-angled trapezium block become by plastic injection, trapezoidal oblique of described block piece 28 The groove of circular arc, the groove of described block piece 28 circular arc is had to match with the caliber of described back rest pipe 23 on face, described resistance Front and back being respectively arranged with a vertical twist-on hole on the most aspectant of block piece 28, described block piece 28 is opened up at described folding stand 2 When opening, allow the rear end of described upper slotware 24 be pressed on described back rest pipe 23 location by described block piece 28, described on Mutual horizontal rotate perforation being punched through locking bolt and described front-axle beam pipe 21 knee is connected of slotware 24 front end Connect, the front end of described upper slotware 24 mutual to perforation and horizontal lining between perforation is also had of described front-axle beam pipe 21 knee Plastic washer, the rear portion of described upper slotware 24 mutual to being punched through before lock bolt and described back rest pipe 23 leading section One horizontal is rotationally connected perforation, the rear portion of described upper slotware 24 mutual is to perforation and described back rest pipe 23 leading section Previous horizontal being also lined with plastic washer between perforation, described lower slotware 25 is downward by the rammed notch of sheet metal Grooved stamping, the front-end and back-end upper side of described lower slotware 25 all with U-shaped gap, the left and right two of described lower slotware 25 front end The left and right sides of side and rear end is respectively arranged with one mutual to perforation, the front end of described lower slotware 25 mutual to being punched through lock spiral shell Bolt and horizontal perforation is rotationally connected in described front-axle beam pipe 21 rear end, the front end of described lower slotware 25 mutual to perforation with described Front-axle beam pipe 21 rear end horizontal to perforation be also lined with plastic washer, described lower slotware 25 rear end mutual to be punched through to lock spiral shell Rear horizontal perforation is rotationally connected of bolt and described back rest pipe 23 leading section, described lower slotware 25 rear end mutual to perforation And rear the one of described back rest pipe 23 leading section horizontal is also lined with plastic washer between perforation, and described car chair 4 is that plastics blow Plastotype car chair, the medicated cushion of described car chair 4 has two connecting holes, and two connecting holes of described car chair 4 are by by two pairs of bolt spiral shells Female and the described left and right holes being connected sheet 27 connects.

Described front wheels 5 include that front-wheel, crank shaft, two connecting rods and two pedals are constituted, and described front-wheel is plastics The solid wheel of wheel hub, the axis hole of described front-wheel connects and has three horizontal convex tendons, be respectively arranged with one in the convex tendon that described front-wheel three is horizontal Horizontal perforation, described crank shaft is made up of curved bar and two intermediate plates, and curved bar is that each car in the two ends by a round steel has a jump-ring slot, Then the both ends of round steel are each pressed into two bendings, and two two bendings at curved bar both ends are the most corresponding, and intermediate plate is planchet The metal stamping sheet of lamellar, the circumference of intermediate plate has the U-shaped gap of three deciles, and the U-shaped gap of three deciles of intermediate plate is with described Cross-perforating on the horizontal convex tendon of front-wheel three is corresponding, and there are the circular hole in the middle of a circular hole, intermediate plate and curved bar diameter in the centre of intermediate plate Corresponding, the circular hole of an intermediate plate welds with the middle part of curved bar, is penetrated by curved bar in the axis hole of described front-wheel, will be welded in curved bar The intermediate plate in portion leans against the side of front-wheel, and by horizontal corresponding to described front-wheel three for three U-shaped gap of the intermediate plate being welded in the middle part of curved bar Cross-perforating on convex tendon, is also socketed on curved bar and leans against the opposite side of front-wheel, with three to bolt and nut by another intermediate plate Cross-perforating twist-on on horizontal with front-wheel three for three U-shaped gap of two intermediate plates convex tendon being fixed, described connecting rod is that top has Vertical sleeve joint hole, bottom have the working of plastics of horizontal axis hole, and before and after described connecting rod sleeve joint hole, both sides have longitudinal to wearing Hole, the lateral shaft borehole jack of connecting rod described in two is connected on curved bar, and lays respectively at the both sides of described front-wheel, and two pedals are socketed respectively In the both ends of curved bar, and it is connected in the jump-ring slot at curved bar two ends location, the socket borehole jack of connecting rod described in two with two jump rings It is connected to the lower end of described 1 liang of swan-neck of handlebar, and with two to longitudinal to perforation and institute by connecting rod described in two of bolt and nut State 1 liang of swan-neck of handlebar lower end to perforation location.

Described rear axle 6 is that each car in the two ends by a round steel has a jump-ring slot to form, and described rear axle 6 penetrates in rear axle tube And two ends win, described trailing wheel 7 is the solid wheel of plastic wheel hub, and the trailing wheel 7 described in two is socketed on the two of described rear axle 6 End, is connected in the jump-ring slot at described rear axle 6 two ends location with two jump rings, is positioned at the trailing wheel 7 described in two and described rear axle tube 26 Two ends between be respectively lined with a plastic spacer, between trailing wheel 7 and two jump rings described in two, be respectively lined with a plastic spacer.

Claims

1. a foldable baby tricycle, including handlebar, folding stand, reducing sleeve, seat, front wheels, rear axle and two Trailing wheel, is characterized in that: handlebar is made up of two swan-necks and connector, and swan-neck is to be formed as right-angle bending by a pipe upper end, In the middle part of swan-neck have that the one end with the right-angle bending of swan-neck upper end parallels up and down two are to perforation, at swan-neck Lower end, has mutually vertical to perforation with one end of the right-angle bending of swan-neck upper end, and two couple in the middle part of two swan-necks is punched through Two pairs of perforation locking bolt horizontal with the two of connector are connected, and two swan-necks after being connected with connector are positioned at the left and right of connector Both sides, the end of the right-angle bending of two swan-neck upper ends is in laterally, and the end of the right-angle bending of two swan-neck upper ends is respectively socketed one Grip；Folding stand includes front-axle beam pipe, tumbler, back rest pipe, upper slotware, lower slotware, rear axle tube, connection sheet and block piece, front Beam pipe is that to the back lower place, bending forms the bottom by a pipe, and the holes having one on the other of the leading flank of front-axle beam pipe is front Beam pipe has one horizontal to perforation to the knee of the back lower place, and it is horizontal right that the rear end that front-axle beam pipe bends to the back lower place has one Perforation, front-axle beam pipe holes one on the other is riveted with tumbler by two rivets, and tumbler is by a flat bar sheet metal punching press Forming, the upper and lower two ends of tumbler are in right-angle bending forward, and the both ends of the right-angle bending before tumbler upward and downward have mutual To perforation, in the middle part of tumbler, it is respectively arranged with a hole up and down, noose one reducing sleeve on tumbler, tumbler right-angle bending two ends forward Portion mutual to being punched through lock bolt, the vertical perforation with handlebar connector is rotationally connected, and back rest pipe is by a round metal Pipe rear end respectively has horizontal form perforation before and after being pressed into Ω type, leading section, back rest pipe has one and back rest pipe Ω The vertical perforation that type front is intersected, the Ω-shape port of back rest pipe is used for penetrating rear axle tube, and the vertical perforation of back rest pipe is for by right The Ω type of back rest pipe is held tightly to fix and is penetrated rear axle tube therein, the left and right sides of upper slotware front end and the left and right at rear portion by lock bolt Both sides are respectively arranged with one mutual to perforation, are arranged with four holes, upper slotware upper side longitudinal arrangement before and after upper slotware upper side rear portion Front holes by two rivets with is connected sheet riveting, the rear holes of upper slotware upper side longitudinal arrangement is by two tap bolts and resistance Block piece connects, mutual horizontal turn perforation to being punched through lock bolt with front-axle beam pipe knee of the front end of upper slotware It is dynamically connected, the rear portion of upper slotware mutual previous horizontal to perforation to be punched through lock bolt and back rest pipe leading section Being rotationally connected, the lower left and right sides of slotware front end and the left and right sides of rear end are respectively arranged with one mutual to perforation, lower slotware front end phase Mutual to being punched through lock bolt and horizontal perforation is rotationally connected in front-axle beam pipe rear end, lower slotware rear end mutual to perforation By rear horizontal be rotationally connected perforation to lock bolt with back rest pipe leading section, seat passes through two pairs of bolt and nuts and company Contact pin connects；Two connecting rods of front wheels are socketed on the lower end of handlebar two swan-neck, and position bolt and nut with two, front wheels Being made up of front-wheel, crank shaft, two connecting rods and two pedals, rear axle penetrates in rear axle tube and two ends win, by two rear wheel It is socketed on the two ends of rear axle.

Foldable baby tricycle the most according to claim 1, is characterized in that: described connector is to be noted by plastics Moulding and form, the left and right sides of described connector is respectively arranged with a vertical circular groove, the circular groove of described connector and institute The caliber stating swan-neck is corresponding, and the upper and lower side that described connector is positioned in two circular grooves has two horizontal perforation, described Horizontal perforation two couple upper and lower with in the middle part of described swan-neck of connector two bores a hole corresponding, the rear side of described connector have one to After convex protrude, the convex of described connector has one vertically to bore a hole in protruding, the swan-neck described in two and described connector Two circular groove engagements.

Foldable baby tricycle the most according to claim 1, is characterized in that: in the upper end pore of described front-axle beam pipe Vexed plug, the two ends of the right-angle bending before described tumbler upward and downward are justified with the rear end pore of described front-axle beam pipe is respectively plugged with plastics Become fillet, the right-angle bending before described tumbler upward and downward to open shelves corresponding with the height that the convex of described connector protrudes, Described reducing sleeve is to be made of plastics, and described reducing sleeve is ripple rectangular tubular.

Foldable baby tricycle the most according to claim 1, is characterized in that: the Ω-shape port of described back rest pipe interior Footpath is corresponding with the external diameter of described rear axle tube, is plugged with a plastics vexed plug of circle, described upper groove in the front end pore of described back rest pipe Part is the grooved stamping downward by the rammed notch of sheet metal, and the front end upper side of described upper slotware has U-shaped gap.

Foldable baby tricycle the most according to claim 1, is characterized in that: described connection sheet is by sheet metal Rammed rectangle stamping, has downward flanging, has to the centre of lower hem before and after described connection sheet before and after described connection sheet Gap, before and after described connection sheet, the gap width of flanging matches with the grooved width of described upper slotware, before described connection sheet Rear holes is riveted holes, and the left and right holes of described connection sheet is the connecting hole with seat.

Foldable baby tricycle the most according to claim 1, is characterized in that: described block piece is to be noted by plastics The right-angled trapezium block being moulded, the inclined-plane that described block piece is trapezoidal has the groove of circular arc, described block piece circular arc recessed Groove matches with the caliber of described back rest pipe, and the most aspectant of described block piece is front and back respectively arranged with a vertical twist-on hole, institute The block piece stated, when described folding stand launches, allows the rear end of described upper slotware be pressed in described by described block piece Back rest pipe on position.

Foldable baby tricycle the most according to claim 1, is characterized in that: the front end of described upper slotware is mutual Perforation and the horizontal of described front-axle beam pipe knee also had plastic washer, the phase at the rear portion of described upper slotware to lining between perforation Mutual the previous horizontal of perforation and described back rest pipe leading section is also lined with plastic washer between perforation.

Foldable baby tricycle the most according to claim 1, is characterized in that: described lower slotware is by sheet metal The grooved stamping that rammed notch is downward, the front-end and back-end upper side of described lower slotware all with U-shaped gap, described lower groove The front end of part mutual to perforation horizontal with described front-axle beam pipe rear end be also lined with plastic washer, described lower slotware rear end to boring a hole Mutual rear the one of perforation and described back rest pipe leading section horizontal is also lined with plastic washer, described seat between perforation It is plastics blow molding type seat, the medicated cushion of described seat has two connecting holes.

Foldable baby tricycle the most according to claim 1, is characterized in that: connecting on the axis hole of described front-wheel has Three horizontal convex tendons, are respectively arranged with a horizontal perforation in the convex tendon that described front-wheel three is horizontal, described crank shaft is by curved bar and two folders Sheet is constituted, and curved bar is that each car in the two ends by a round steel has a jump-ring slot, then the both ends of round steel is each pressed into two bendings, Two two bendings at curved bar both ends are the most corresponding, and intermediate plate is the metal stamping sheet of planchet lamellar, and the circumference of intermediate plate has three The U-shaped gap of decile, the U-shaped gap of three deciles of intermediate plate is corresponding with the cross-perforating on the described horizontal convex tendon of front-wheel three, folder The centre of sheet has the circular hole in the middle of a circular hole, intermediate plate corresponding with curved bar diameter, and the circular hole of an intermediate plate welds with the middle part of curved bar, Curved bar is penetrated in the axis hole of described front-wheel, the intermediate plate in the middle part of curved bar will be welded in lean against the side of front-wheel, and song will be welded in Another intermediate plate, corresponding to the cross-perforating on the described horizontal convex tendon of front-wheel three, is also socketed by three U-shaped gap of the intermediate plate in the middle part of bar On curved bar and lean against the opposite side of front-wheel, with three to bolt and nut by three U-shaped gap of two intermediate plates and the horizontal convex tendon of front-wheel three On cross-perforating twist-on fix, described connecting rod is that top has vertical sleeve joint hole, bottom to have the plastics of horizontal axis hole Part, before and after described connecting rod sleeve joint hole, both sides have longitudinal to perforation, and the lateral shaft borehole jack of connecting rod described in two is connected to curved bar On, and laying respectively at the both sides of described front-wheel, two pedals are socketed on the both ends of curved bar respectively, and are connected in curved bar with two jump rings The jump-ring slot at two ends positions.

Foldable baby tricycle the most according to claim 1, is characterized in that: described rear axle is by a round steel The each car in two ends have a jump-ring slot to form, the trailing wheel described in two is socketed on the two ends of described rear axle, is connected in institute with two jump rings State in the jump-ring slot at rear axle two ends and position, between the two ends of the trailing wheel described in two and described rear axle tube, be respectively lined with a plastic mattress Sheet, at the trailing wheel described in two and be respectively lined with a plastic spacer between two jump rings.