CN220198526U - A compression molding device for universal caster processing - Google Patents

Abstract

The utility model relates to a compression molding device for processing universal casters, which belongs to the technical field of processing universal casters and comprises a frame, wherein a driving box is fixedly connected to the frame, a mounting plate is fixedly connected to the driving box, a servo motor is fixedly connected to the mounting plate, an output shaft of the servo motor penetrates through the mounting plate, a workbench is fixedly connected to the output shaft of the servo motor, a plurality of placing grooves are formed in the workbench, universal caster bodies are arranged in the placing grooves, and a pushing mechanism for pushing the universal caster bodies is arranged on the driving box. This application has improved the convenience of taking the universal castor.

Description

A compression molding device for universal caster processing

Technical Field

The utility model belongs to the technical field of universal caster machining, and particularly relates to a compression molding device for universal caster machining.

Background

Currently, universal wheels are so-called caster wheels, which are structured to allow 360 degree horizontal rotation. Casters are a generic term and include movable casters and fixed casters.

The related art can refer to the China patent publication No. CN204936253U and discloses a compression molding device for universal caster processing, which comprises a frame, a workbench arranged at the upper end of the frame, a stand column arranged at the upper end of the frame, a control cabinet arranged at the upper end of the frame, a frame which is of a frame structure and made of compression-resistant materials, a driving box arranged in the frame, a motor arranged in the driving box, a disc-shaped workbench, a plurality of circular grooves arranged on the surface of the workbench, a cylinder arranged at the rear end of the workbench, a pressing plate fixedly connected with the upper surface of the frame through bolts and arranged at the lower end of the stand column, a pressure box arranged at the upper end of the pressure box, a pressing plate arranged at the lower end of the pressure box, one end of the cylinder penetrating through the inside of the pressure box and connected with the pressing plate, the control cabinet arranged at the side of the stand column, a touch panel arranged inside the control cabinet, a feeding cylinder arranged at the side of the workbench, and a discharging groove arranged at the side of the workbench.

The inventors consider that the following technical problems exist in the above prior art scheme: the universal castor is placed in the circular groove in the workbench for pressing, but after the pressing is finished, the universal castor is inconvenient for constructors to take out.

Disclosure of Invention

The present utility model has been made to solve the above-mentioned problems, and an object of the present utility model is to provide a press molding apparatus for caster processing.

The utility model realizes the above purpose through the following technical scheme:

the utility model provides a press forming device for universal castor processing, includes the frame, fixedly connected with drive box in the frame, fixedly connected with mounting panel on the drive box, fixedly connected with servo motor on the mounting panel, just servo motor's output shaft passes the mounting panel setting, fixedly connected with workstation on servo motor's the output shaft, a plurality of standing grooves have been seted up on the workstation, be provided with the universal castor body in the standing groove, be provided with the pushing mechanism who is used for promoting the universal castor body on the drive box, pushing mechanism includes driving motor, carousel, transfer line, push rod and sliding seat, driving motor fixedly connected on the inside wall of drive box, carousel fixedly connected on driving motor's output shaft, driving motor can order about the carousel rotates, sliding seat fixedly connected on the inside wall of drive box, the push rod passes the sliding seat sets up, all offer on the diapire of corresponding each standing groove and pass the hole, the push rod can remove to pass downthehole, the one end of transfer line is rotated and is connected in on the carousel, the other end of transfer line is rotated in the transfer line;

the pushing mechanism further comprises a trigger component for starting the driving motor;

the pushing mechanism further comprises a limiting assembly used for blocking the universal caster body from falling.

Through adopting above-mentioned technical scheme, in order to improve the convenience of taking out the universal castor body, after the universal castor body accomplishes the pressing operation, start servo motor, servo motor drives the workstation and rotates, after the workstation rotates certain angle, utilize trigger assembly start driving motor work, driving motor drives the carousel rotation, the carousel rotates and drives the transfer line and remove, the transfer line removes and drives the catch bar and remove, thereby make the catch bar remove to passing downthehole, after catch bar and universal castor body contact, promote the universal castor body and remove, then utilize spacing subassembly, the possibility that the universal castor body continues to fall has been reduced, thereby make the universal castor body part be located the workstation outside, and then the staff of being convenient for takes the universal castor body.

As a further optimization scheme of the utility model, the trigger assembly comprises a plurality of fixed blocks, a metal deflector rod, a storage battery, a first conductive block and a second conductive block, wherein the storage battery is fixedly connected to the driving motor, the first conductive block and the second conductive block are fixedly connected to the inner side wall of the driving box, the first conductive block and the second conductive block are electrically connected with the storage battery, the metal deflector rod is fixedly connected to the second conductive block, one end of the metal deflector rod, which is far away from the second conductive block, is abutted against the first conductive block, the plurality of fixed blocks are fixedly connected to the workbench, the fixed blocks are arranged in one-to-one correspondence with the placing grooves, and the fixed blocks are abutted against the metal deflector rod.

Through adopting above-mentioned technical scheme, when needs start driving motor, after the workstation rotates for fixed block and metal plectrum contact, thereby make the metal plectrum take place deformation, and then make metal plectrum butt on first conducting block, make the battery can be for driving motor power supply, reached the purpose of start driving motor then.

As a further optimization scheme of the utility model, the limiting assembly comprises a sliding block, a limiting block and a compression spring, wherein a sliding cavity and a sliding hole which are communicated are formed in the inner wall of the placing groove, the limiting block penetrates through the sliding hole, an inclined surface is arranged on the limiting block, the sliding block is fixedly connected to the limiting block, the sliding block is in sliding connection with the inner wall of the sliding cavity, one end of the compression spring is fixedly connected to the inner wall of the sliding cavity, and the other end of the compression spring is fixedly connected to the sliding block.

Through adopting above-mentioned technical scheme, after the universal castor body removes, compression spring promotes the sliding block and the stopper removes to make the stopper be located the standing groove, after the catch bar moves to the one side of keeping away from the universal castor body, the universal castor body moves down under the effect of gravity, stops removing after universal castor body and stopper contact, thereby has reduced the possibility that the universal castor body further falls.

As a further optimization scheme of the utility model, the driving box is fixedly connected with the mounting frame, the mounting frame is fixedly connected with the air cylinder, the air cylinder is fixedly connected with the pressure box, the pressure box is fixedly connected with the connecting rod, the connecting rod is fixedly connected with the connecting seat, the connecting seat is provided with the pressing plate, and the connecting seat is provided with a plurality of groups of connecting mechanisms for fixing the pressing plate.

Through adopting above-mentioned technical scheme, when the universal castor body of different models of needs suppression, utilize coupling mechanism to dismantle the clamp plate to can change the clamp plate of corresponding model.

As a further optimization scheme of the utility model, the connecting mechanism comprises a connecting block and a positioning rod, wherein the connecting block is fixedly connected to the pressing plate, a connecting groove is formed in the connecting seat, the connecting block is in plug-in fit with the connecting groove, a sliding groove and a sliding hole which are communicated with each other are formed in the side wall of the connecting groove, the connecting block is provided with the connecting hole, the positioning rod sequentially penetrates through the sliding hole and the connecting hole, and the positioning rod is in sliding connection with the inner wall of the sliding hole and the inner wall of the connecting hole;

the connecting mechanism further comprises a clamping assembly for fixing the positioning rod.

Through adopting above-mentioned technical scheme, when the clamp plate of fixed different models is needed, remove the clamp plate for the connecting block inserts in the spread groove, then inserts the locating lever, and the reuse chucking subassembly makes the locating lever fixed, thereby has reduced the possibility that locating lever and connecting block take place to remove, and then has reached the purpose of fixed clamp plate.

As a further optimization scheme of the utility model, the clamping assembly comprises a connecting ring and a plurality of elastic sheets, wherein the connecting ring is fixedly connected to the inner wall of the sliding groove, the elastic sheets are fixedly connected to the connecting ring and uniformly distributed on the inner peripheral surface of the connecting ring along the circumferential direction of the connecting ring, and one ends, far away from the connecting ring, of the elastic sheets are abutted against the outer peripheral surface of the positioning rod.

Through adopting above-mentioned technical scheme, when the fixed locating lever of needs, utilize a plurality of elastic pieces butt in the outer peripheral face of locating lever, under the effect of the frictional force between a plurality of elastic pieces and the locating lever, reduced the possibility that the locating lever moved.

As a further optimization scheme of the utility model, the connecting mechanism further comprises a pushing assembly, the pushing assembly comprises a pushing ring and a fixing ring, the fixing ring is sleeved on the positioning rod, the pushing ring is fixedly connected to the fixing ring, and the pushing ring is in butt joint with the elastic pieces.

Through adopting above-mentioned technical scheme, when the spacing to the locating lever is removed to needs, remove the solid fixed ring, gu fixed ring removes and drives the go-between and remove to make a plurality of elastic pieces take place deformation, thereby make a plurality of elastic pieces no longer butt in the outer peripheral face of locating lever, and then reached and removed the purpose spacing to the locating lever.

The utility model has the beneficial effects that: in order to improve convenience in taking out the universal castor body, after the universal castor body finishes pressing operation, a servo motor is started, the servo motor drives a workbench to rotate, after the workbench rotates for a certain angle, a fixed block is abutted against a metal deflector rod, so that the metal deflector rod is deformed, and then the metal deflector rod is contacted with a first conductive block, a storage battery can supply power for the driving motor, so that a turntable is driven to rotate by the driving motor, the turntable rotates to drive a transmission rod to move, the transmission rod moves to drive a pushing rod to move, so that the pushing rod moves into a through hole, after the pushing rod contacts with the universal castor body, the universal castor body is pushed to move, then a compression spring pushes a sliding block and a limiting block to move, so that the limiting block moves into a placing groove, the universal castor body falls down to contact with the limiting block, and the possibility that the universal castor body continuously falls down is reduced by using the limiting block, so that the universal castor body is positioned outside the workbench, and a worker is convenient to take the universal castor body;

when the universal castor body of different models needs to be pressed, promote solid fixed ring and go-between for a plurality of elastic pieces all take place deformation, thereby make a plurality of elastic pieces no longer butt in the outer peripheral face of locating lever, and then removed the spacing to the locating lever, then pull out the locating lever, thereby can remove the clamp plate, make the connecting block break away from the inside of spread groove, then remove new clamp plate, insert the spread groove with the connecting block in, reinsert the locating lever, release solid fixed ring and go-between, a plurality of elastic pieces resume deformation, thereby make a plurality of elastic pieces butt in the outer peripheral face of locating lever, and then reduced the possibility that the locating lever removed, the purpose of changing the clamp plate of different models has been reached.

Drawings

FIG. 1 is a schematic view of the overall structure of the present utility model;

FIG. 2 is a schematic view showing the structure of the pushing mechanism according to the present utility model;

FIG. 3 is a schematic view of the structure of the salient and limit assembly of the present utility model;

FIG. 4 is a schematic view of the structure of the press plate and the connection base of the present utility model;

fig. 5 is a schematic view showing the structure of the connecting mechanism according to the present utility model.

In the figure: 1. a frame; 11. a drive box; 12. a mounting plate; 13. a servo motor; 14. a work table; 141. a placement groove; 142. a through hole; 143. a sliding cavity; 144. a slip hole; 15. a universal castor body; 16. a mounting frame; 161. a cylinder; 162. a pressure tank; 163. a connecting rod; 17. a connecting seat; 171. a connecting groove; 172. a slip groove; 173. a slip hole; 18. a pressing plate; 19. placing a plate; 191. discharging boxes; 192. a collection box; 2. a pushing mechanism; 21. a driving motor; 22. a turntable; 23. a transmission rod; 24. a push rod; 25. a sliding seat; 3. a trigger assembly; 31. a fixed block; 32. a metal deflector rod; 33. a storage battery; 34. a first conductive block; 35. a second conductive block; 4. a limit component; 41. a sliding block; 42. a limiting block; 43. a compression spring; 5. a connecting mechanism; 51. a connecting block; 511. a connection hole; 52. a positioning rod; 53. a clamping assembly; 54. a connecting ring; 55. an elastic sheet; 56. a pushing assembly; 57. pushing the ring; 58. and a fixing ring.

Detailed Description

The following detailed description of the present application is provided in conjunction with the accompanying drawings, and it is to be understood that the following detailed description is merely illustrative of the application and is not to be construed as limiting the scope of the application, since numerous insubstantial modifications and adaptations of the application will be to those skilled in the art in light of the foregoing disclosure.

Example 1

As shown in fig. 1-5, a compression molding device for processing universal casters comprises a frame 1, fixedly connected with driving box 11 on frame 1, fixedly connected with mounting panel 12 on driving box 11, fixedly connected with servo motor 13 on mounting panel 12, and servo motor 13's output shaft passes mounting panel 12 setting, fixedly connected with workstation 14 on servo motor 13's output shaft, a plurality of standing grooves 141 have been seted up on workstation 14, be provided with universal casters body 15 in the standing groove 141, be provided with the pushing mechanism 2 that is used for promoting universal casters body 15 on driving box 11, fixedly connected with mounting bracket 16 on driving box 11, fixedly connected with cylinder 161 on mounting bracket 16, fixedly connected with pressure tank 162 on the cylinder 161, fixedly connected with connecting rod 163 on the pressure tank 162, fixedly connected with connecting seat 17 on the connecting seat 17, be provided with clamp plate 18 on the connecting seat 17, be provided with multiunit coupling mechanism 5 that are used for fixed clamp plate 18 on the driving box 11, fixedly connected with place plate 19 on the place plate 19, one side that workstation 14 kept away from the blowing box 191 is provided with collecting box 192.

The pushing mechanism 2 comprises a driving motor 21, a rotating disc 22, a transmission rod 23, a pushing rod 24, a sliding seat 25, a triggering assembly 3 and a limiting assembly 4, wherein the driving motor 21 is fixedly connected to the inner side wall of the driving box 11, the rotating disc 22 is fixedly connected to an output shaft of the driving motor 21, the driving motor 21 can drive the rotating disc 22 to rotate, the sliding seat 25 is fixedly connected to the inner side wall of the driving box 11, the pushing rod 24 penetrates through the sliding seat 25, penetrating holes 142 are formed in the bottom wall of each placing groove 141 correspondingly, the pushing rod 24 can move into the penetrating holes 142, one end of the transmission rod 23 is rotatably connected to the rotating disc 22, and the other end of the transmission rod 23 is rotatably connected to the pushing rod 24.

The trigger assembly 3 comprises a plurality of fixed blocks 31, a metal deflector rod 32, a storage battery 33, a first conductive block 34 and a second conductive block 35, wherein the storage battery 33 is fixedly connected to the driving motor 21, the first conductive block 34 and the second conductive block 35 are fixedly connected to the inner side wall of the driving box 11, the first conductive block 34 and the second conductive block are electrically connected with the storage battery 33, the metal deflector rod 32 is fixedly connected to the second conductive block 35, one end, far away from the second conductive block, of the metal deflector rod 32 is abutted against the first conductive block 34, the fixed blocks 31 are fixedly connected to the workbench 14, the fixed blocks 31 are arranged in one-to-one correspondence with the placing grooves 141, and the fixed blocks 31 are abutted against the metal deflector rod 32.

The limiting component 4 comprises a sliding block 41, a limiting block 42 and a compression spring 43, wherein a sliding cavity 143 and a sliding hole 173144 which are communicated are formed in the inner wall of the placing groove 141, the limiting block 42 penetrates through the sliding hole 173144, an inclined surface is arranged on the limiting block 42, the inclined surface on the limiting block 42 is obliquely downwards arranged from one end close to the sliding block 41 to one end far away from the sliding block 41, the sliding block 41 is fixedly connected to the limiting block 42, the sliding block 41 is attached to the inner side wall of the sliding cavity 143 and slides, one end of the compression spring 43 is fixedly connected to the inner side wall of the sliding cavity 143, and the other end of the compression spring 43 is fixedly connected to the sliding block 41.

In order to improve the convenience of taking out the universal castor body 15, after the universal castor body 15 finishes the pressing operation, the servo motor 13 is started, the servo motor 13 drives the workbench 14 to rotate, after the workbench 14 rotates by a certain angle, the fixed block 31 is abutted against the metal deflector rod 32, so that the metal deflector rod 32 is deformed, further, the metal deflector rod 32 is contacted with the first conductive block 34, the storage battery 33 can supply power for the driving motor 21, so that the turntable 22 is driven to rotate by the driving motor 21, the turntable 22 rotates to drive the transmission rod 23 to move, the transmission rod 23 moves to drive the push rod 24 to move, so that the push rod 24 moves into the through hole 142, after the push rod 24 contacts with the universal castor body 15, the universal castor body 15 is pushed to move, then the compression spring 43 pushes the sliding block 41 and the limiting block 42 to move, the limiting block 42 moves into the placing groove 141, the universal castor body 15 is contacted with the limiting block 42 after falling, the possibility that the universal castor body 15 continues to fall is reduced by using the limiting block 42, and the universal castor body 15 is positioned outside the workbench 14, so that the universal castor body 15 is convenient for a worker to take the universal castor 15.

The connecting mechanism 5 comprises a connecting block 51, a positioning rod 52, a clamping assembly 53 and a pushing assembly 56, wherein the connecting block 51 is fixedly connected to the pressing plate 18, a connecting groove 171 is formed in the connecting seat 17, the connecting block 51 is in plug-in fit with the connecting groove 171, a sliding groove 172 and a sliding hole 173144 which are communicated with each other are formed in the side wall of the connecting groove 171, a connecting hole 511 is formed in the connecting block 51, the positioning rod 52 sequentially penetrates through the sliding hole 173144 and the connecting hole 511, and the positioning rod 52 is attached to the inner wall of the sliding hole 173144 and the inner wall of the connecting hole 511.

The clamping assembly 53 comprises a connecting ring 54 and a plurality of elastic pieces 55, the connecting ring 54 is fixedly connected to the inner side wall of the sliding groove 172, the elastic pieces 55 are fixedly connected to the connecting ring 54, the elastic pieces 55 are uniformly distributed on the inner peripheral surface of the connecting ring 54 along the circumferential direction of the connecting ring 54, and one ends, away from the connecting ring 54, of the elastic pieces 55 are abutted to the outer peripheral surface of the positioning rod 52.

The pushing assembly 56 comprises a pushing ring 57 and a fixing ring 58, the fixing ring 58 and the pushing ring 57 are sleeved on the positioning rod 52, the pushing ring 57 is fixedly connected to the fixing ring 58, and the pushing ring 57 is abutted against the plurality of elastic pieces 55.

When the universal castor body 15 with different models needs to be pressed, the fixing ring 58 and the pushing ring 57 are pushed so that the plurality of elastic sheets 55 are deformed, so that the plurality of elastic sheets 55 are not abutted against the outer peripheral surface of the positioning rod 52 any more, the limit on the positioning rod 52 is removed, the positioning rod 52 is pulled out, the pressing plate 18 can be moved, the connecting block 51 is separated from the inside of the connecting groove 171, then a new pressing plate 18 is moved, the connecting block 51 is inserted into the connecting groove 171, the positioning rod 52 is inserted, the fixing ring 58 and the pushing ring 57 are released, the plurality of elastic sheets 55 are restored to be deformed, the plurality of elastic sheets 55 are abutted against the outer peripheral surface of the positioning rod 52, the possibility that the positioning rod 52 moves is reduced, and the purpose of changing the pressing plate 18 with different models is achieved.

The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims (7)

1. The utility model provides a press forming device for universal caster processing, includes frame (1), its characterized in that: the utility model discloses a novel multifunctional electric power machine, which is characterized in that a driving box (11) is fixedly connected with a driving box (1), a mounting plate (12) is fixedly connected with the driving box (11), a servo motor (13) is fixedly connected with the mounting plate (12), an output shaft of the servo motor (13) passes through the mounting plate (12) to be arranged, a workbench (14) is fixedly connected with the output shaft of the servo motor (13), a plurality of placing grooves (141) are formed in the workbench (14), universal caster bodies (15) are arranged in the placing grooves (141), a pushing mechanism (2) for pushing the universal caster bodies (15) is arranged on the driving box (11), the pushing mechanism (2) comprises a driving motor (21), a rotary disc (22), a transmission rod (23), a pushing rod (24) and a sliding seat (25), the driving motor (21) is fixedly connected to the inner side wall of the driving box (11), the rotary disc (22) is fixedly connected to the output shaft of the driving motor (21), the driving motor (21) can drive the rotary disc (22) to rotate, the pushing rod (25) is fixedly connected to the driving rod (24) to pass through the corresponding bottom wall (141) and the bottom wall (142) is formed by the sliding seat (25), the pushing rod (24) can move into the through hole (142), one end of the transmission rod (23) is rotatably connected to the rotary table (22), and the other end of the transmission rod (23) is rotatably connected to the pushing rod (24);

the pushing mechanism (2) further comprises a trigger assembly (3) for starting the driving motor (21);

the pushing mechanism (2) further comprises a limiting assembly (4) for blocking the universal caster body (15) from falling down.

2. A compression molding apparatus for caster manufacturing as defined in claim 1, wherein: the trigger assembly (3) comprises a plurality of fixed blocks (31), a metal deflector rod (32), a storage battery (33), a first conductive block (34) and a second conductive block (35), wherein the storage battery (33) is fixedly connected to the driving motor (21), the first conductive block (34) and the second conductive block (35) are fixedly connected to the inner side wall of the driving box (11), the first conductive block (34) and the second conductive block (35) are electrically connected with the storage battery (33), one end, away from the second conductive block (35), of the metal deflector rod (32) is fixedly connected to the second conductive block (35), the first conductive block (34) is abutted, the plurality of fixed blocks (31) are fixedly connected to the workbench (14), the fixed blocks (31) are correspondingly arranged with the placing grooves (141) one by one, and the fixed blocks (31) are abutted to the metal deflector rod (32).

3. A compression molding apparatus for caster manufacturing as defined in claim 1, wherein: limiting component (4) are including sliding block (41), stopper (42) and compression spring (43), set up sliding chamber (143) and sliding hole (173) (144) that are linked together on the inner wall of standing groove (141), stopper (42) pass sliding hole (173) (144) and set up, be provided with the inclined plane on stopper (42), sliding block (41) fixed connection in on stopper (42), sliding block (41) with the inner wall sliding connection of sliding chamber (143), the one end fixed connection of compression spring (43) in on the inner wall of sliding chamber (143), the other end fixed connection of compression spring (43) in on sliding block (41).

4. A compression molding apparatus for caster manufacturing as defined in claim 1, wherein: fixedly connected with mounting bracket (16) on driving box (11), fixedly connected with cylinder (161) on mounting bracket (16), fixedly connected with pressure tank (162) on cylinder (161), fixedly connected with connecting rod (163) on pressure tank (162), fixedly connected with connecting seat (17) on connecting rod (163), be provided with clamp plate (18) on connecting seat (17), be provided with multiunit coupling mechanism (5) that are used for fixed clamp plate (18) on connecting seat (17).

5. A compression molding apparatus for caster manufacturing as defined in claim 4, wherein: the connecting mechanism (5) comprises a connecting block (51) and a positioning rod (52), the connecting block (51) is fixedly connected to the pressing plate (18), a connecting groove (171) is formed in the connecting seat (17), the connecting block (51) is in plug-in fit with the connecting groove (171), a sliding groove (172) and a sliding hole (173) (144) which are communicated with each other are formed in the side wall of the connecting groove (171), the connecting block (51) is provided with the connecting hole (511), the positioning rod (52) sequentially penetrates through the sliding holes (173) (144) and the connecting hole (511), and the positioning rod (52) is in sliding connection with the inner wall of the sliding hole (173) (144) and the inner wall of the connecting hole (511);

the connecting mechanism (5) further comprises a clamping assembly (53) for fixing the positioning rod (52).

6. A compression molding apparatus for caster manufacturing as defined in claim 5, wherein: the clamping assembly (53) comprises a connecting ring (54) and a plurality of elastic pieces (55), the connecting ring (54) is fixedly connected to the inner wall of the sliding groove (172), the elastic pieces (55) are fixedly connected to the connecting ring (54), the elastic pieces (55) are uniformly distributed on the inner circumferential surface of the connecting ring (54) along the circumferential direction of the connecting ring (54), and one ends, away from the connecting ring (54), of the elastic pieces (55) are abutted to the outer circumferential surface of the positioning rod (52).

7. The press forming device for caster manufacturing of claim 6, wherein: the connecting mechanism (5) further comprises a pushing assembly (56), the pushing assembly (56) comprises a pushing ring (57) and a fixing ring (58), the fixing ring (58) is sleeved on the positioning rod (52), the pushing ring (57) is fixedly connected to the fixing ring (58), and the pushing ring (57) is in butt joint with a plurality of elastic pieces (55).