Hinge having damping structure

Abstract

A hinge having a damping structure, the hinge comprising: a pipe unit, which defines an inner cavity and an outer cavity; a shaft unit; and a valve unit, which is arranged on the pipe unit and is configured to control the flow direction of a fluid, wherein the pipe unit is constructed to have a first flow path, a second flow path and a third flow path which are in communication with the inner cavity and the outer cavity; the shaft unit comprises a shaft member which can move in the inner cavity; the shaft member enables the fluid in the inner cavity to be squeezed into the outer cavity, such that the fluid pushes the valve unit to close the first flow path and the third flow path; and when the shaft member is moving, same can also draw the fluid in the outer cavity to enter the inner cavity via the third flow path and enter a shaft cavity of the shaft member via the first flow path. In this way, the fluid is held in the inner cavity and the shaft cavity, which can not only reduce the size of the pipe unit, but can also simplify the overall structure.

Description

Field of the Invention

[0001] The present invention relates to a hinge having damping structure , specifically referring to a damping structure hinge that provides a damping effect through hydraulics.Description of the Prior Art

[0002] A well-known hinge device, disclosed in Taiwan Patent No. I654363, includes a first hinge leaf for fastening two objects, and two sleeve units disposed between the aforementioned multiple first hinge leaves and rotating synchronously with the aforementioned multiple first hinge leaves. This structure utilizes the damping effect generated by a hydro-module within one of the sleeve units, when an external force acts on either object, to control the speed of the relative displacement of the aforementioned objects, thereby achieving a damping effect.

[0003] However, the hydraulic oil design of the aforementioned hydro-module is relatively complex, and there is still room for improvement regarding the number of components, cost, ease of processing, and assembly procedures. More importantly, as shown in FIG. 4 of Taiwan Patent No. I654363, one of the aforementioned sleeve units uses a double bevel design, which causes a shaft segment and an actuating member to push each other during relative rotation, triggering the aforementioned hydro-module to achieve the damping effect. There is an easy risk of slippage between the aforementioned multiple bevels.SUMMARY OF THE INVENTION

[0004] The aim of the present invention is therefore to provide a damping structure hinge which can reduce the overall volume, has a simplified structure, is easy to install, and ensures accurate motion transmission.

[0005] The present invention's damping structure hinge, therefore, includes an pipe unit, a shaft unit, and a valve unit.

[0006] The aforementioned pipe unit extends along the axis direction, and includes an inner sleeve, an outer sleeve surrounding the aforementioned inner sleeve and forming an outer cavity with the aforementioned inner sleeve, and a shaft sleeve assembly surrounding the aforementioned outer sleeve. The aforementioned pipe unit further constructs a first flow path, a second flow path, a third flow path, that communicate with the aforementioned outer cavity.

[0007] The aforementioned shaft unit includes a shaft member capable of moving along the direction of the aforementioned axis. The aforementioned shaft member has a buffer section that is disposed through the aforementioned inner sleeve and forms an inner cavity with the inner sleeve. The aforementioned buffer section forms a shaft cavity that communicates with the aforementioned inner cavity, and has a shaft channel that communicates with the aforementioned shaft cavity.

[0008] The aforementioned valve unit includes a first valve set disposed through and located between the shaft channel and the shaft cavity, and is operatively capable of blocking the first flow path. It also includes a second valve set disposed through and located between the second flow path and the third flow path, and is operatively capable of blocking the third flow path.

[0009] Utilizing this structure, the aforementioned shaft member is able to move between a first position and a second position in the aforementioned inner sleeve. At the aforementioned first position, the volume of the inner cavity is minimized. At the aforementioned second position, the volume of the inner cavity is maximized. When the aforementioned shaft member moves from the first position toward the second position, the fluid pushes the second valve set to open the third flow path. The fluid enters the inner cavity from the aforementioned outer cavity through the third flow path. When the aforementioned shaft member is close to the second position, the fluid further pushes the first valve set to open the first flow path. The fluid then enters the shaft cavity from the outer cavity through the first flow path and the shaft channel. When the aforementioned shaft member moves from the second position toward the first position, the fluid passes from the inner cavity through the second flow path to enter the outer cavity. It simultaneously pushes the first valve set to close the first flow path, and pushes the second valve set to close the third flow path.

[0010] The efficacy of the present invention lies in: utilizing the design of the shaft cavity, the fluid can be gathered in the inner cavity or the shaft cavity during the movement of the shaft member. Thereby, by utilizing the inner cavity and the shaft cavity to contain the fluid, the volume of the pipe unit can be reduced, and the overall structure can be simplified.

[0011] In one embodiment, the aforementioned inner sleeve has a first flow path. The aforementioned first flow path extends in a direction perpendicular to the aforementioned axis direction and is adjacent to one end of the aforementioned inner sleeve. When the aforementioned shaft member is located at the aforementioned second position, the shaft channel of the aforementioned shaft member communicates with the first flow path.

[0012] In one embodiment, the aforementioned buffer section further has an opening that communicates with the shaft cavity and the inner cavity. The aforementioned first valve set has a first valve element and a first ball element. The aforementioned first valve element is provided with a plug that can be disposed through and inserted into the aforementioned buffer section, and an arc plug opposite to the plug and capable of tightly contacting the buffer section. The aforementioned first ball element can be pushed by fluid, used to close the aforementioned opening, or used to press against the aforementioned first valve element to block the communication between the shaft cavity and the shaft channel.

[0013] In one embodiment, the aforementioned inner sleeve further has a second flow path. The aforementioned second flow path is adjacent to the other end of the inner sleeve, and has a straight segment extending along the axis direction and communicating with the inner cavity, and a crossflow segment extending in a direction perpendicular to the axis and communicating with the aforementioned outer cavity and the straight segment.

[0014] In one embodiment, the aforementioned inner sleeve further has a third flow path. The aforementioned third flow path communicates with the straight segment in a direction perpendicular to the axis direction. The second valve set has a second valve element and a second ball element. The aforementioned second valve element is provided with a plug that can be disposed through and inserted into the aforementioned inner sleeve, and an arc plug opposite to the aforementioned plug of the second valve element and capable of tightly contacting the inner sleeve. The second ball element is suitable for being pushed by fluid, and used to press against the aforementioned second valve element and block the communication between the third flow path and the aforementioned inner cavity.

[0015] In one embodiment, the aforementioned valve unit further includes a throttle valve. The aforementioned throttle valve is screwed into the other end of the aforementioned inner sleeve along the direction of the axis, and has a throttling section that forms a throttling gap with the aforementioned inner sleeve. The width of the aforementioned throttling gap and throttling section perpendicular to the direction of the aforementioned axis gradually increases from one end adjacent to the aforementioned inner cavity toward the other end away from the aforementioned inner cavity. The screwing depth of the aforementioned throttle valve and inner sleeve is inversely proportional to the width of the throttling gap.

[0016] In one embodiment, a pivot assembly is also included. The aforementioned pivot assembly includes two operable hinge leaves, and each hinge leaf is provided with a sleeve. A plurality of sleeves are arranged along the direction of the aforementioned axis and form a conduit surrounding the axis. A pipe unit is disposed through the aforementioned conduit along the direction of the aforementioned axis, and can rotate together with one of the hinge leaves. The shaft member of the aforementioned shaft unit rotates together with the other hinge leaf. It is also able to move along the axis direction during the rotation of either hinge leaf, generating a damping force through the fluid between the inner cavity and the outer cavity.

[0017] In one embodiment, the aforementioned shaft unit further includes a slot, an indexing plate, at least one annular gasket (preferably four pieces), a first actuating member, and at least one first plug member. The aforementioned slot, indexing plate, annular gasket, and first actuating member are fixed by metal rivet. When the first plug member of the aforementioned shaft member rotates, it can slide fixedly up and down, enabling the door panel to close slowly. Further explaining, when the aforementioned shaft member rotates together with the other hinge leaf, the aforementioned first actuating member is installed on the aforementioned shaft sleeve and can rotate together with the aforementioned shaft sleeve. The aforementioned first actuating member has two spaced-apart upper grooves, and two spaced-apart lower grooves that form a phase shift with the plurality of upper grooves along the axis direction. The aforementioned at least one first plug member is connected to the aforementioned shaft member, can rotatably abut against the aforementioned first actuating member, and can be caught in the plurality of upper grooves or the plurality of lower grooves. When one hinge leaf drives the pipe unit to rotate, or the other hinge leaf drives the shaft member to rotate, the aforementioned first actuating member and the at least one first plug member push each other, and drive the shaft member to move along the axis direction.

[0018] In one embodiment, the aforementioned shaft sleeve assembly has two axial notches spaced apart and extending from one end face along the axis direction. The aforementioned first actuating member further has two protrusions spaced apart and formed on the circumferential surface. The plurality of aforementioned protrusions can correspond to the plurality of axial notches of the aforementioned shaft sleeve assembly.

[0019] In one embodiment, an accumulator unit is also included. The aforementioned accumulator unit is disposed through the conduit along the axis direction. It includes a first cylinder capable of rotating together with one of the aforementioned hinge leaves, a second cylinder rotatably sleeved in the first cylinder and capable of rotating together with the other hinge leaf, and a movable and rotatable ratchet member sleeved in the aforementioned first cylinder. The aforementioned ratchet member can be detachably engaged with the first cylinder. The aforementioned shaft unit further includes a torsional elastic member that can be disposed through the first cylinder and connected to the ratchet member and the second cylinder. When the aforementioned one hinge leaf drives the first cylinder to rotate positively, or the other hinge leaf drives the second cylinder to rotate positively, the aforementioned torsional elastic member will be twisted by the ratchet member or the second cylinder, thereby generating an elastic force capable of driving the corresponding hinge leaf to rotate in reverse.

[0020] In one embodiment, the first cylinder of the aforementioned accumulator unit has an annular gear section formed on the inner circumferential surface. The aforementioned ratchet member has a coupling portion sleeved onto the aforementioned shaft member, a driving section extending from the aforementioned coupling portion along the axis direction and operable, and a plurality of pawl teeth formed in the coupling portion and detachably engageable with the aforementioned annular gear section.

[0021] In one embodiment, the aforementioned accumulator unit further includes a locking bolt. The aforementioned ratchet member further has a c-shaped annular groove formed on the outer circumferential surface. The aforementioned locking bolt is screwed into the aforementioned one of the hinge leaves perpendicular to the direction of the axis and is disposed through the aforementioned first cylinder. It is provided with an extension portion that is detachably disposed through the annular groove of the aforementioned ratchet member.

[0022] In one embodiment, an accumulator unit is also included. The aforementioned accumulator unit is disposed through the conduit along the axis direction. It includes a first cylinder rotating together with the aforementioned one hinge leaf, a second cylinder rotatably sleeved in the first cylinder and capable of rotating together with the aforementioned other hinge leaf, and an accumulator element screwed into the aforementioned first cylinder and capable of pushing the aforementioned second cylinder along the axis direction. The aforementioned shaft unit further includes a torsional elastic member disposed through and located between the aforementioned second cylinder and the shaft sleeve assembly, and connected to the aforementioned second cylinder and the aforementioned pipe unit. When the aforementioned one hinge leaf drives the first cylinder and the shaft sleeve assembly to rotate, or the other hinge leaf drives the second cylinder to rotate, an insertion section of the aforementioned torsional elastic member is inserted into a coupling portion of the ratchet member and an insertion hole of the second cylinder. The aforementioned torsional elastic member will be twisted by the shaft sleeve assembly or the second cylinder, thereby generating an elastic force capable of driving the corresponding hinge leaf to rotate in reverse. The screwing depth of the aforementioned accumulator element and the first cylinder is directly proportional to the pressure exerted by the second cylinder on the torsional elastic member.

[0023] In one embodiment, the aforementioned shaft unit further includes a second actuating member and at least one second plug member. The aforementioned second actuating member is installed between the first cylinder and the second cylinder and can rotate together with the first cylinder. The aforementioned second actuating member has two spaced-apart upper grooves, and two spaced-apart lower grooves that form a phase shift with the plurality of upper grooves along the axis direction. The aforementioned at least one second plug member is connected to the shaft member, and can rotatably abut against the second actuating member, and can be caught in the plurality of upper grooves or the plurality of lower grooves of the aforementioned second actuating member. When the first cylinder is driven to rotate, or the shaft member is driven to rotate, the aforementioned second actuating member and the aforementioned at least one second plug member will push each other, generating a friction that slows down the rotational speed.

[0024] In one embodiment, the sleeve of the aforementioned other hinge leaf further has two engaging portions protruding from the inner surface and facing each other. The second cylinder of the aforementioned accumulator unit has a rotating section sleeved in the first cylinder, and a limiting section opposite in position to the rotating section. The aforementioned rotating section has two second notches opposite to the end face of the aforementioned rotating section, extending along the axis direction and fitted into the plurality of engaging portions, and a rectangular hole formed on the aforementioned end face. The aforementioned shaft member further has an accumulation section opposite to the buffer section and having a rectangular cross-section. The aforementioned accumulation section is disposed through the aforementioned accumulator unit along the axis direction and is sleeved into the aforementioned rectangular hole.BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG. 1 is a top schematic view illustrating an embodiment where a door panel is connected to a fixed surface via the damping structure hinge of the present invention. FIG. 2 is an exploded perspective view of the aforementioned embodiment. FIG. 3 is an incomplete exploded perspective view of the aforementioned embodiment. FIG. 4 is an incomplete cross-sectional view illustrating an accumulator unit of the aforementioned embodiment. FIG. 5 is another incomplete exploded perspective view of the aforementioned embodiment. FIG. 6 is an incomplete cross-sectional view illustrating a shaft member of the aforementioned embodiment located at a first position. FIG. 7 is an incomplete cross-sectional view similar to FIG. 6, but a first valve set blocks a first flow path, and a second valve set opens a third flow path. FIG. 8 is an incomplete cross-sectional view at an angle different from FIG. 7, illustrating the aforementioned shaft member of the aforementioned embodiment located at the aforementioned second position, and the aforementioned first valve set opening the aforementioned first flow path. FIG. 9 is an incomplete cross-sectional view similar to FIG. 7, but the aforementioned first valve set blocks the aforementioned first flow path, and the aforementioned second valve set blocks the aforementioned third flow path. FIG. 10 is a cross-sectional view of the aforementioned embodiment. FIG. 11 is a cross-sectional view at an angle different from FIG. 10, illustrating a torsional elastic member of the aforementioned embodiment being twisted. FIG. 12 is an incomplete exploded perspective view similar to FIG. 3, but with a different accumulator unit; and FIG. 13 is an incomplete cross-sectional view illustrating a variation of the aforementioned accumulator unit and a shaft unit in the aforementioned embodiment. Legend description

[0026] 11: door panel 12: fixed surface 2: pivot assembly 20: conduit 21: first hinge leaf 211: first sleeve 212: reinforcing section 22: second hinge leaf 221: second sleeve 222: engaging portion 23: spacer ring 231: spacer protrusion 24: retaining ring 3: accumulator unit 31: first cylinder 311: first notch 312: through hole 313: annular gear section 32: second cylinder 321: rotating section 322: limiting section 323: second notch 324: rectangular hole 325: insertion hole 33: ratchet member 331: coupling portion 332: driving section 333: pawl tooth 334: annular groove 34: locking pin 35: locking bolt 351: extension portion 36: accumulator element 4: pipe unit 40: outer cavity 41: inner sleeve 411: first flow path 412: second flow path 4121: straight segment 4122: crossflow segment 413: third flow path 414: screw hole 415: through hole 416: sealing gasket 42: outer sleeve 421: sealing gasket 43: shaft sleeve assembly 431: axial notch 432: metal rivet 44: locking pin 45: locking bolt 451: extension portion 46: indexing plate 461: slot 5: shaft unit 50: inner cavity 51: shaft member 510: shaft cavity 511: buffer section 512: accumulation section 513: opening 514: shaft channel 52: oil seal 520: annular gap 53: first actuating member 531: protrusion 532: upper groove 533: lower groove 54: first plug member 55: annular gasket 551: protrusion 56: torsional elastic member 561: insertion section 57: auxiliary elastic member 58: second actuating member 582: upper groove 583: lower groove 59: second plug member 6: valve unit 61: first valve set 611: first valve element 612: first ball element 613: plug 62: second valve set 621: second valve element 622: second ball element 623: plug 63: throttle valve 630: throttling gap 631: throttling section 632: sealing gasket X: axisDETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Referring to FIG. 1 and FIG. 2, an embodiment of the damping structure hinge of the present invention is applicable to connect a door panel 11 and a fixed surface 12. The fixed surface 12 may be a door frame, a wall surface, or a ground surface. The door panel 11 and the fixed surface 12 form an included angle. The angle of the included angle is between 0 degrees and 200 degrees. When the included angle is 0 degrees, it is in a door-closing state, and when the included angle is greater than 0 degrees, it is in a door-opening state.

[0028] The damping structure hinge of the present invention includes a pivot assembly 2, an accumulator unit 3, a pipe unit 4, a shaft unit 5, and a valve unit 6 (as shown in FIG. 6).

[0029] Referring to FIGs. 2, 3, and 4, the pivot assembly 2 includes a first hinge leaf 21, a second hinge leaf 22, two spacer rings 23, and two retaining rings 24, wherein the first hinge leaf 21, the second hinge leaf 22, the spacer ring 23, and the retaining ring 24 are mutually connected and configured to move synchronously due to an external force.

[0030] The first hinge leaf 21 has at least two first sleeves 211, wherein the first sleeves 211 surround the axis X and are spaced apart along the direction of the axis X, and a reinforcing section 212 that connects the aforementioned first sleeves 211. The second hinge leaf 22 has a second sleeve 221 surrounding the axis X and disposed through the aforementioned first sleeves 211. The second sleeve 221 and the aforementioned first sleeves 211 define a conduit 20 (as shown in FIG. 10) extending along the direction of the axis X, having two engaging portions 222 protruding from the inner surface and distributed angularly.

[0031] The multiple spacer rings 23 further include a spacer protrusion 231, which is disposed within the multiple first sleeves 211 or is disposed within the multiple second sleeves 221.

[0032] The aforementioned multiple retaining rings 24 are embedded inside the aforementioned multiple first sleeves 211.

[0033] The accumulator unit 3 and the pipe unit 4 are placed inside the conduit 20 along the direction of the axis X. The accumulator unit 3 includes a first cylinder 31 and a second cylinder 32. The first cylinder 31 rotates together with the first sleeve 211. The second cylinder 32 is rotatably sleeved within the second sleeve 221 of the second hinge leaf 22. It further includes a ratchet member 33, which ratchet member 33 is movable along the direction of the axis X and rotatably disposed within the first cylinder 31. The first cylinder 31 further includes two locking pins 34 and one locking bolt 35.

[0034] One end of the first cylinder 31 extends along the direction of the axis X and is provided with two first notches 311. The two first notches 311 are spaced apart. A through hole 312 is provided on the outer surface of the first cylinder 31 in a direction perpendicular to the axis X, and an annular gear section 313 is provided inside the first cylinder 31.

[0035] The second cylinder 32 has a rotatable rotating section 321 and a limiting section 322. The rotating section 321 can be connected to the first cylinder 31. The limiting section 322 extends along the direction of the axis X and is provided with the second notch 323 and the rectangular hole 324. The second notch 323 is not limited to one. The number of second notches 323 can be fitted into the engaging portion 222 of the second sleeve 221, so that the second cylinder 32 of the accumulator unit 3 can rotate together with the second hinge leaf 22.

[0036] The ratchet member 33 is provided with a coupling portion 331. The coupling portion 331 has a driving section 332 extending along the direction of the axis X. The coupling portion 331 is provided with a pawl tooth 333, which pawl tooth 333 is engageable with the annular gear section 313. A c-shaped annular groove 334 is formed between the coupling portion 331 and the driving section 332.

[0037] The locking pins 34 are passed through the first sleeve 211 in a direction perpendicular to the axis X and inserted into the first cylinder 31, so that the first hinge leaf 21 can rotate together with the first cylinder 31 when the first cylinder 31 rotates.

[0038] The locking bolt 35 is screwed into the first sleeve 211 in a direction perpendicular to the axis X and passes through the through hole 312 of the first cylinder 31. The locking bolt 35 is provided with an extension portion 351. The extension portion 351 can be inserted into the annular groove 334 of the ratchet member 33.

[0039] Referring to FIGs. 2, 5, and 6, the pipe unit 4 can pass through the conduit 20 and be disposed therein. The pipe unit 4 includes an inner sleeve 41, an outer sleeve 42 located outside the inner sleeve 41 and configured to form an outer cavity 40, a shaft sleeve assembly 43 located outside the outer sleeve 42, two locking pins 44, and one locking bolt 45.

[0040] The inner sleeve 41 is provided with a first flow path 411 perpendicular to the direction of the axis X, a second flow path 412 adjacent to the other end of the inner sleeve 41 and extending from the direction of the axis X, a third flow path 413 perpendicular to the direction of the axis X, a screw hole 414 located at one end of the inner sleeve 41, and a through hole 415 perpendicular to the direction of the axis X and intersecting the screw hole 414. The first flow path 411 is in communication with the outer cavity 40 inside the inner sleeve 41. The second flow path 412 extends to include a straight segment 4121, where the straight segment 4121 is in communication with the inside of the inner sleeve 41, and a crossflow segment 4122 perpendicular to the direction of the axis X and in communication with the outer cavity 40 and the straight segment 4121. The third flow path 413 is in communication with the second flow path 412.

[0041] The shaft sleeve assembly 43 abuts against the retaining ring 24 along with the outer sleeve 42 and the inner sleeve 41, and is provided with two mutually spaced axial notches 431 extending along the direction of the axis X.

[0042] The locking pins 44 pass through another first sleeve 211 in a direction perpendicular to the axis X and are plugged into the shaft sleeve assembly 43, so that the first hinge leaf 21 can rotate together when the shaft sleeve assembly 43 rotates. The locking bolt 45 is screwed into another first sleeve 211 in a direction perpendicular to the axis X, and passes through the shaft sleeve assembly 43 and the outer sleeve 42 to be inserted into the through hole 415 of the inner sleeve 41. The locking bolt 45 is provided with an extension portion 451.

[0043] The shaft unit 5 includes one shaft member 51, two oil seals 52, one first actuating member 53, two first plug members 54, a plurality of annular gaskets 55, one torsional elastic member 56, and two auxiliary elastic members 57. A sealing gasket 421 is provided between the first actuating member 53 and the outer sleeve 42.

[0044] The shaft member 51 is movable along the direction of the axis X and can be disposed within the inner sleeve 41. It defines, together with the inner sleeve 41, a buffer section 511 located in the inner cavity 50, and an accumulation section 512 located in the opposite direction to the buffer section 511 and disposed within the accumulator unit 3. The buffer section 511 forms a shaft cavity 510 and has an opening 513 extending along the direction of the axis X and communicating with the shaft cavity 510 and the inner cavity 50, and a shaft channel 514 extending perpendicularly to the direction of the axis X and communicating with the shaft cavity 510 and the interior of the inner sleeve 41. The cross-section of the accumulation section 512 is rectangular and can be sleeved into the rectangular hole 324 of the second cylinder 32, so that the shaft member 51 rotates together with the second cylinder 32.

[0045] The oil seals 52 are sleeved onto the accumulation section 512 of the shaft member 51 and are in tight contact with the inner surface of the inner sleeve 41. The oil seals 52 cover the shaft channel 514, and form an annular gap 520 with the inner surface of the inner sleeve 41.

[0046] The first actuating member 53 is installed in the shaft sleeve assembly 43 and forms two protrusions 531, two upper grooves 532, and a lower groove 533 spaced apart on its outer circumference. The protrusions 531 are fitted into the axial notches 431 of the shaft sleeve assembly 43, thereby enabling the first actuating member 53 to rotate together with the shaft sleeve assembly 43. The lower grooves 533 form a phase shift with the upper grooves 532 along the direction of the axis X.

[0047] The first plug members 54 are connected to the shaft member 51 and are located between the buffer section 511 and the accumulation section 512. The first plug members 54 rotatably abut against the first actuating member 53, and can be caught in the upper grooves 532 or the lower grooves 533.

[0048] The annular gaskets 55 are installed within the shaft sleeve assembly 43. Each annular gasket 55 is formed with a protrusion 551 spaced apart on its outer circumference. The protrusions 551 can be sleeved into the axial notches 431 of the shaft sleeve assembly 43, enabling the annular gaskets 55 to rotate together with the shaft sleeve assembly 43.

[0049] The torsional elastic member 56 is disposed between the ratchet member 33 and the limiting section 322 of the second cylinder 32, and is provided with an insertion section 561 extending along the direction of the axis X at both ends. The insertion sections 561 can be inserted into the ratchet member 33 and the second cylinder 32.

[0050] The auxiliary elastic member 57 is pressed between the shaft member 51 and the ratchet member 33, and is configured to continuously generate an elastic force that moves the shaft member 51 away from the ratchet member 33. This elastic force action reduces the resistance of the shaft member 51 when rolling between the upper groove 532 and the lower groove 533 of the first actuating member 53, further improving the smoothness when opening the door from 0 degrees to 90 degrees.

[0051] The valve unit 6 includes a first valve set 61, a second valve set 62, and a throttle valve 63. The first valve set 61 can move along the direction of the axis X between the shaft channel 514 and the shaft cavity 510 and can block the first flow path 411. The second valve set 62 is placed perpendicularly to the axis X, moves between the second flow path 412 and the third flow path 413, and can block the second valve set 62 within the third flow path 413. The throttle valve 63 is screwed into the screw hole 414 of the inner sleeve 41.

[0052] The first valve set 61 includes a first valve element 611 and a first ball element 612. The first valve element 611 is provided with a plug which can be disposed within the buffer section 511 and tightly combined. The first ball element 612 can be pushed by fluid to close the opening 513, or be used to tightly abut against the first valve element 611 to block the communication between the shaft cavity 510 and the shaft channel 514.

[0053] The second valve set 62 has a second valve element 621 and a second ball element 622. The second valve element 621 is provided with a plug which can be disposed within the inner sleeve 41 and tightly combined. The second ball element 622 can be pushed by fluid to tightly abut against the second valve element 621, thereby blocking the communication between the third flow path 413 and the inner cavity 50.

[0054] The throttle valve 63 has a throttling section 631 that forms a throttling gap 630 with the inner sleeve 41. In other words, when the throttle valve 63 and the inner sleeve 41 perform vertical movement, a throttling section 631 is located between the throttle valve 63 and the inner sleeve 41. When the width of the throttling gap 630 and the throttling section 631 in a direction perpendicular to the axis X gradually increases from one end adjacent to the inner cavity 50 toward the other end away from the inner cavity 50, the screwing depth of the throttle valve 63 and the inner sleeve 41 will be inversely proportional to the width of the throttling gap 630. When the screwing depth of the throttle valve 63 and the inner sleeve 41 is deeper, the width of the throttling gap 630 in a direction perpendicular to the axis X is smaller. When the screwing depth of the throttle valve 63 and the inner sleeve 41 is shallower, the width of the throttling gap 630 in a direction perpendicular to the axis X is larger.

[0055] When the shaft member 51 moves from the second position toward the first position, or moves vertically from the second position toward the first position, due to a tight sealing gasket 421, fluid will pass from the inner cavity 50 through the second flow path 412 to enter the outer cavity 40, and will push the first valve set 61 to close the first flow path 411, and simultaneously push the second valve set 62 to close the third flow path 413. At this time, the fluid can only pass from the inner cavity 50 through the second flow path 412 to enter the outer cavity 40, as indicated by the arrow in FIG. 9.

[0056] Referring to FIG. 2, 10, and 11, during assembly of the components, it is only necessary to insert the pre-assembled pipe unit 4, shaft unit 5, and valve unit 6 into the conduit 20 along the direction of the axis X, and abut them against the retaining ring 24. Then, insert the pre-assembled accumulator unit 3 into the conduit 20, so that the first cylinder 31 of the accumulator unit 3 is fitted into the first sleeve 211 with the retaining ring 24 and is positioned in the conduit 20.

[0057] Next, the locking bolts 45 and 35 are screwed onto the first sleeve 211, and the locking bolt 35 passes through the through hole 312 of the first cylinder 31. The locking bolt 45 passes through the shaft sleeve assembly 43 and the outer sleeve 42 and is inserted into the through hole 415 of the inner sleeve 41. The locking bolts 45 and 35 can then be used to connect the accumulator unit 3, the pipe unit 4, and the pivot assembly 2. Finally, the locking pins 44 and 34 are inserted into the first sleeves 211, the first cylinder 31, and the pipe unit 4. The locking pins 44 and 34 can then be used to further restrict the accumulator unit 3, the pipe unit 4, and the pivot assembly 2.

[0058] Referring to FIGs. 7, 8, 10, and 11, when an external force drives the door panel 11 to drive the second hinge leaf 22 to rotate positively with respect to the fixed surface 12 around the axis X, from the door-closing state of 0 degrees to the door-opening state of 85 degrees to 95 degrees, the second hinge leaf 22 will drive the shaft member 51 to rotate together through the second cylinder 32 of the accumulator unit 3. Since the rotating section 321 of the second cylinder 32 is idling with respect to the first cylinder 31, the shaft member 51 will torsionally twist the aforementioned torsional elastic member 56 to generate a restoring force during rotation, in the situation where the first hinge leaf 21 is not rotated.

[0059] At the same time, when the indexing plate 46, the annular gaskets 55, and the first actuating member 53 are fixed in the shaft sleeve assembly 43 and the axial notches 431 using metal riveting 432, the shaft member 51 will simultaneously drive the first plug members 54 to roll from the lower grooves 533 into the upper grooves 532 of the first actuating member 53. During the rolling process of the first plug members 54, the position difference between the lower grooves 533 and the upper grooves 532 is utilized to drive the shaft member 51 to move along the axis X direction from the first position toward the second position. Therefore, during the movement of the buffer section 511, in addition to generating a siphon effect (suction force) due to the pressure change in the inner cavity 50, which draws fluid from the outer cavity 40 toward the third flow path 413, it will also push the second valve set 62 to open the third flow path 413, allowing fluid to quickly enter the inner cavity 50 from the third flow path 413 through the second flow path 412. Since the fluid can flow quickly, the resulting damping force is small, thereby minimizing the resistance when opening the door. When the shaft member 51 moves from the second position to the second position, the fluid filled above the buffer section 511 and inside the outer cavity 40 will further push the first valve set 61 to open the first flow path 411, as indicated by the arrow in FIG. 8, and enter the shaft cavity 510 from the outer cavity 40 through the first flow path 411 and the shaft channel 514. Therefore, the fluid accommodated by the shaft cavity 510 that enters the outer cavity 40 can reduce the volume of the outer cavity 40, and further reduce the volume of the outer sleeve 42.

[0060] Referring to FIGs. 8, 9, 10, and 11, when the external force driving the door panel 11 is released, the second cylinder 32 is driven by the restoring force of the torsional elastic member 56 to rotate in reverse. During the rotation of the shaft member 51, the shaft member 51 will drive the shaft member 51 to roll from the upper grooves 532 to the lower grooves 533 of the first actuating member 53. Utilizing the phase shift between the lower grooves 533 and the upper grooves 532, the shaft member 51 moves along the axis X direction from the second position toward the first position.

[0061] During the process when the second hinge leaf 22 rotates in reverse from the door-opening state toward the door-closing state, either to the right or to the left, the buffer section 511 of the shaft member 51 will push the fluid inside the inner cavity 50. This causes the fluid to push the first valve element 611 of the first valve set 61 and then open the shaft cavity 510, while simultaneously pushing the first valve set 61 to block the shaft channel 514 and the first flow path 411. At the same time, the fluid entering the second flow path 412 from the inner cavity 50 will also push the second valve set 62 to block the third flow path 413. Therefore, since the fluid can only flow toward the second flow path 412, it can only flow from the inner cavity 50 through the straight segment 4121 of the second flow path 412 to enter the throttling gap 630, then from the throttling gap 630 to enter the crossflow segment 4122, and finally from the crossflow segment 4122 to enter the outer cavity 40, as indicated by the arrow in FIG. 9. At this time, due to the relatively small space of the throttling gap 630, the fluid can only pass through the throttling gap 630 slowly, thus generating a larger damping force. Coupled with the rolling friction effect of the first plug members 54 and the first actuating member 53, the second hinge leaf 22 can be rotated at a slow speed, achieving the effect of slow door closing and reducing the speed of door closing.

[0062] It should be noted that the present invention is not limited to achieving the effects of damping, door opening, and door closing by rotating the second hinge leaf 22. In other variations of this embodiment, when an external force drives the first hinge leaf 21 to rotate about the axis X, the shaft sleeve assembly 43 and the first cylinder 31 can be driven to rotate through the first sleeves 211. When the first cylinder 31 is idling relative to the second cylinder 32, and the second hinge leaf 22, the second cylinder 32, and the shaft member 51 are fixed, the first actuating member 53 is driven to rotate relative to the shaft member 51 through the shaft sleeve assembly 43, and the ratchet member 33 is driven to rotate through the first cylinder 31. Therefore, the first actuating member 53 can similarly be used to push the shaft member 51 to move along the direction of the axis X to generate a damping force. Furthermore, the ratchet member 33 will similarly twist the torsional elastic member 56 to generate a restoring force, which is combined with vertically compressed pressure and lateral thrust, thereby enhancing the restoring force. This allows the present invention to have no directional limitations during installation.

[0063] Referring to FIG. 6 and 8, the throttle valve 63 can be inserted with a hand tool (not shown). By rotating the throttle valve 63 with the hand tool, the screwing depth of the throttle valve 63 and the screw hole 414 of the inner sleeve 41 can be adjusted, thereby adjusting the size of the throttling gap 630. For example, when the throttling gap 630 is larger, the flow rate of the fluid in the second flow path 412 will be faster, and the door closing speed of the first hinge leaf 21 or the second hinge leaf 22 will be faster. When the gap is maximized, it is equivalent to a complete absence of fluid damping effect, leaving only the mechanical sliding resistance of the shaft members 51 and the first actuating member 53 to dampen the door closing speed. At this time, rotating the ratchet member 33 can be used to lower the accumulator torque value, and combined with mechanical sliding resistance, slow down the door closing speed and achieve a balancing effect. Conversely, when the throttling gap 630 is smaller, the flow rate of the fluid in the second flow path 412 will be slower, the fluid damping effect will be greater, and the door closing speed of the first hinge leaf 21 or the second hinge leaf 22 will be slower. This method is used to achieve the effect of adjustable door closing speed.

[0064] Referring to FIG. 4, when adjusting the accumulator torque value, it is only necessary to first press down the ratchet member 33 with a hand tool, so that the pawl teeth 333 of the ratchet member 33 are disengaged from the annular gear section 313 of the first cylinder 31. Then, by rotating the ratchet member 33, the aforementioned torsional elastic member 56 can be twisted, and the elastic force of the torsional elastic member 56 can be changed. When the hand tool releases the aforementioned ratchet member 33, the ratchet member 33 is pushed again by the torsional elastic member 56, causing the pawl teeth 333 to engage with the annular gear section 313. For example, the aforementioned ratchet member 33 can rotate 360 degrees, and rotating it every 36 degrees can increase the restoring force by approximately 18.5 kg.

[0065] Further explaining, although the ratchet member 33 can rotate 360 degrees, it is limited by the extension portion 351 of the locking bolt 35, and the ratchet member 33 can only be rotated approximately 324 degrees. The locking bolt 35 must be rotated backward until the extension portion 351 is disengaged from the annular groove 334, only then can the ratchet member 33 continue to be rotated.

[0066] It should be particularly noted that the torsional elastic member 56 is not limited to only being twisted. In other alternative designs of the present invention, the torsional elastic member 56 can also be compressed by the accumulator unit 3. Referring to FIG. 2, 12, and 13, the accumulator unit 3 similarly includes the first cylinder 31, the second cylinder 32, the locking pins 34, and the locking bolt 35. The difference is that the accumulator unit 3 omits the ratchet member 33 shown in FIG. 3, and further includes an accumulator member 36.

[0067] The accumulator member 36 is screwed together with the first cylinder 31, and is able to push the second cylinder 32 along the direction of the axis X. Additionally, the aforementioned pipe unit 4 further includes a plurality of indexing plates 46, which indexing plates 46 are fitted into the aforementioned shaft sleeve assembly 43. The aforementioned indexing plates 46 have a plurality of wavy slots 461 surrounding the axis X.

[0068] The torsional elastic member 56 of the shaft unit 5 passes through and is disposed between the second cylinder 32 and the shaft sleeve assembly 43 and is inserted into the slots 461 of the second cylinder 32 and the corresponding indexing plate 46. The shaft unit 5 further includes a second actuating member 58 and a second plug member 59. The second actuating member 58 is installed between the first cylinder 31 and the second cylinder 32 and can rotate together with the first cylinder 31. The second actuating member 58 has two upper grooves 582 spaced at an appropriate distance, and a plurality of lower grooves 583 that form a phase shift with the upper grooves 582 along the direction of the axis X. The second plug members 59 are connected to the shaft member 51, rotatably abut against the second actuating member 58, and can be caught in the upper grooves 582 or the lower grooves 583 of the second actuating member 58.

[0069] When the first cylinder 31 or the shaft member 51 is rotated, the second actuating member 58 and the second plug members 59 will push each other, thereby generating friction that slows down the rotational speed. Similarly, by only rotating the accumulator member 36 with a hand tool, the second cylinder 32 can be pushed to compress the torsional elastic member 56 and change the elastic force of the torsional elastic member 56. The screwing depth of the accumulator member 36 and the first cylinder 31 is directly proportional to the pressure exerted by the second cylinder 32 on the torsional elastic member 56.

[0070] Through the above description, the advantages of the aforementioned embodiment can be summarized as follows: 1.The present invention uses a special fluid configuration, combined with the design of the shaft cavity 510 of the shaft member 51, to allow fluid to be gathered inside the inner cavity 50 or the shaft cavity 510 during the movement of the shaft member 51. Furthermore, a sealing gasket 632 is provided between the throttle valve 63 and the inner sleeve 41 to prevent vertical movement. By utilizing this structure, when the inner cavity 50 and the shaft cavity 510 accommodate fluid, it not only reduces the volume of the pipe unit 4, but also simplifies the overall structure. 2.The present invention has no directional limitation for installation and no directional limitation for door opening. While being able to reduce the volume of the pipe unit 4, it can also further reduce the overall length, making it applicable for hinges connecting different types of door frames, the fixed surface 12, and the door panel 11. 3.The present invention only needs to adjust the ratchet member 33 or adjust the throttle valve 63 to control the door closing speed of the door panel 11 and change the resistance during door closing. This not only meets the needs of different users but is also quite simple in operation. 4.The pipe unit 4, the shaft unit 5, and the valve unit 6 of the present invention can be separately assembled into a mechanism that provides damping force, and can be used with any other object that requires damping force, making the scope of application quite wide.

[0071] The above description is merely an embodiment of the present invention and should not be construed as limiting the scope of its implementation. Any simple equivalent changes or modifications made in accordance with the claims and the specification of the present invention shall still fall within the scope covered by this patent.

Claims

1. The hinge having damping structure, characterized in that it includes: a pipe unit, extending along the direction of the axis, includes an inner sleeve, an outer sleeve, where the outer sleeve surrounds the aforementioned inner sleeve and forms an outer cavity, and a shaft sleeve assembly surrounding the aforementioned outer sleeve. The aforementioned pipe unit constructs a first flow path, a second flow path, and a third flow path that are in communication with the outer cavity; a shaft unit, including a shaft member capable of moving along the direction of the aforementioned axis, where the aforementioned shaft member has a buffer section. The buffer section can be disposed through the aforementioned inner sleeve and forms an inner cavity with the aforementioned inner sleeve. The aforementioned buffer section forms a shaft cavity that communicates with the aforementioned inner cavity, and has a shaft channel that communicates with the aforementioned shaft cavity; and a valve unit, including a first valve set. The first valve set is disposed through and located between the aforementioned shaft channel and the aforementioned shaft cavity, and can block the passage of the aforementioned first flow path. A second valve set is disposed through and located between the aforementioned second flow path and the aforementioned third flow path, and can block the passage of the aforementioned third flow path; utilizing the aforementioned structure, the shaft member can move between a first position and a second position in the inner sleeve. when the shaft member is at the first position, the volume of the inner cavity is minimized. when the shaft member is at the second position, the volume of the inner cavity is maximized. when the shaft member moves from the first position toward the second position, the fluid will push the second valve set and open the third flow path. the fluid enters the inner cavity from the outer cavity through the third flow path. when the shaft member approaches the second position, the fluid will further push the first valve set to open the first flow path. the fluid then passes from the outer cavity through the first flow path and the shaft channel and enters the shaft cavity. when the shaft member moves from the second position toward the first position, the fluid passes from the inner cavity through the second flow path to enter the outer cavity. it simultaneously pushes the first valve set to close the first flow path, and simultaneously pushes the second valve set to close the aforementioned third flow path.

2. The hinge having damping structure according to claim 1 is characterized in that the aforementioned inner sleeve has a first flow path. the aforementioned first flow path extends in a direction perpendicular to the aforementioned axis and is adjacent to one end of the aforementioned inner sleeve. when the aforementioned shaft member is located at the second position, the shaft channel of the aforementioned shaft member communicates with the aforementioned first flow path.

3. The hinge having damping structure according to claim 2 is characterized in that the aforementioned buffer section further has an opening that communicates with the shaft cavity and the inner cavity. The aforementioned first valve set has a first valve element and a first ball element. The aforementioned first valve element is provided with a plug disposed through and inserted into the buffer section, and an arc plug located in an opposite position to the aforementioned plug and capable of being tightly engaged with the buffer section. The aforementioned first ball element can be pushed by fluid, used to close the aforementioned opening, or used to abut against the aforementioned first valve element and block the shaft channel of the shaft cavity.

4. The hinge having damping structure according to claim 2 is characterized in that the aforementioned inner sleeve further has a second flow path. The aforementioned second flow path is adjacent to the other end of the inner sleeve, and has a straight segment extending along the direction of the axis and communicating with the inner cavity, and a crossflow segment extending in a direction perpendicular to the axis and communicating with the outer cavity and the straight segment.

5. The hinge having damping structure according to claim 4 is characterized in that the aforementioned inner sleeve further has a third flow path. The aforementioned third flow path extends in a direction perpendicular to the axis and communicates with the straight segment. The aforementioned second valve set has a second valve element and a second ball element. The aforementioned second valve element has a plug disposed through and inserted into the inner sleeve, and a plug opposite to the aforementioned plug of the second valve element. This plug has an arc plug capable of being tightly contacted with the inner sleeve. The aforementioned second ball element can be pushed by fluid, used to abut against the second valve element and block the communication between the third flow path and the inner cavity.

6. The hinge having damping structure according to claim 5 is characterized in that the valve unit further includes a throttle valve. The throttle valve is screwed into the other end of the aforementioned inner sleeve along the direction of the axis, and has a throttling section that forms a throttling gap with the inner sleeve. The width of the aforementioned throttling gap and throttling section perpendicular to the direction of the axis gradually increases from one end adjacent to the inner cavity toward the other end away from the inner cavity. The screwing depth of the aforementioned throttle valve and the inner sleeve is inversely proportional to the width of the throttling gap.

7. The hinge having damping structure according to claim 1 is characterized in that it further includes a pivot assembly. The aforementioned pivot assembly includes two operable hinge leaves, and each hinge leaf has a sleeve. The aforementioned sleeves are arranged along the direction of the axis and form a conduit surrounding the axis. The aforementioned pipe unit is disposed inside the aforementioned conduit along the direction of the axis and rotates together with one of the hinge leaves. The shaft member of the aforementioned shaft unit rotates together with the other hinge leaf, and is able to move along the direction of the axis during the rotation of either hinge leaf, generating a damping force through the fluid between the inner cavity and the outer cavity.

8. The hinge having damping structure according to claim 7 is characterized in that the aforementioned shaft unit further includes a slot, an indexing plate, at least one annular gasket, a first actuating member, and at least one first plug member. The aforementioned slot, indexing plate, annular gasket, and first actuating member are fixed by metal rivet. When the first plug member of the aforementioned shaft member rotates, it can be fixed to slide up and down. The aforementioned shaft member rotates together with the other hinge leaf. The aforementioned first actuating member is installed with the shaft sleeve and rotates together with the aforementioned shaft sleeve. The aforementioned first actuating member has two spaced-apart upper grooves, and two lower grooves that form a phase shift and correspond to the plurality of upper grooves along the direction of the aforementioned axis. The at least one first plug member is connected to the shaft member, rotatably abuts against the aforementioned first actuating member, and can be caught in the plurality of upper grooves or the plurality of lower grooves. When one of the hinge leaves drives the aforementioned pipe unit to rotate, or the aforementioned other hinge leaf drives the shaft member to rotate, the aforementioned first actuating member and the at least one first plug member will push each other, and drive the shaft member to move along the direction of the axis.

9. The hinge having damping structure according to claim 8 is characterized in that the aforementioned shaft sleeve assembly is provided with two axial notches spaced at a certain distance and extending from one end along the axis direction. The circumference of the aforementioned first actuating member is provided with two protrusions spaced at a certain distance. The plurality of aforementioned protrusions and the plurality of axial notches of the shaft sleeve assembly can be mutually fitted.

10. The hinge having damping structure according to claim 8 is characterized in that it further includes an accumulator unit. The aforementioned accumulator unit is disposed through the conduit along the direction of the axis, and includes a first cylinder capable of rotating together with the aforementioned one of the hinge leaves, a second cylinder rotatably sleeved in the first cylinder and capable of rotating together with the aforementioned other hinge leaf, and a movable and rotatably sleeved ratchet member in the first cylinder. The aforementioned ratchet member can be engaged with the first cylinder. The aforementioned shaft unit further includes a torsional elastic member disposed through the first cylinder and connectable to the ratchet member and the second cylinder. When the aforementioned one of the hinge leaves drives the first cylinder to rotate, or the aforementioned other hinge leaf drives the second cylinder to rotate, the insertion section of the torsional elastic member is inserted into the coupling portion of the ratchet member and the insertion hole of the second cylinder. The aforementioned torsional elastic member will be twisted by the ratchet member or the second cylinder, thereby generating an elastic force that drives the hinge leaf to rotate in reverse.

11. The hinge having damping structure according to claim 10 is characterized in that the inner circumferential surface of the first cylinder of the aforementioned accumulator unit is provided with an annular gear section. The aforementioned ratchet member is provided with a coupling portion sleeved onto the shaft member, a driving section extending from the coupling portion along the axis direction and operable, and a plurality of pawl teeth formed on the coupling portion and engageable with the aforementioned annular gear section.

12. The hinge having damping structure according to claim 10 is characterized in that the aforementioned accumulator unit further includes a locking bolt. The outer circumferential surface of the ratchet member is further provided with a c-shaped annular groove. The aforementioned locking bolt is screwed into one of the hinge leaves perpendicular to the direction of the axis and is disposed through the aforementioned first cylinder. It is also provided with an extension portion that is detachably disposed through the annular groove of the aforementioned ratchet member.

13. The hinge having damping structure according to claim 8 is characterized in that it includes an accumulator unit. The aforementioned accumulator unit is disposed through the conduit along the direction of the axis, and includes a first cylinder rotating together with one of the hinge leaves, a second cylinder rotatably sleeved in the first cylinder and capable of rotating together with the other hinge leaf, and an accumulator element screwed into the first cylinder and capable of pushing the aforementioned second cylinder along the direction of the axis. The aforementioned shaft unit further includes a torsional elastic member disposed through and located between the second cylinder and the shaft sleeve assembly, and connected to the second cylinder and the pipe unit. When the aforementioned one of the hinge leaves drives the first cylinder and the shaft sleeve assembly to rotate positively, or the aforementioned other hinge leaf drives the second cylinder to rotate positively, the torsional elastic member will be twisted by the shaft sleeve assembly or the second cylinder, thereby generating an elastic force capable of driving the corresponding hinge leaf to rotate in reverse. The screwing depth of the aforementioned accumulator element and the first cylinder is directly proportional to the pressure exerted by the second cylinder on the torsional elastic member.

14. The hinge having damping structure according to claim 13 is characterized in that the aforementioned shaft unit further includes a second actuating member and at least one second plug member. The aforementioned second actuating member is installed between the first cylinder and the second cylinder, and can rotate together with the first cylinder. The aforementioned second actuating member has two upper grooves spaced at a certain distance, and two lower grooves that form a phase shift and correspond to the plurality of upper grooves along the direction of the axis. The at least one second plug member is connected to the aforementioned shaft member, and can rotatably abut against the aforementioned second actuating member, and can be caught in the plurality of upper grooves or the plurality of lower grooves of the second actuating member. When the first cylinder is driven to rotate, or the aforementioned shaft member is driven to rotate, the second actuating member and the at least one second plug member will push each other, generating a friction that slows down the rotational speed.

15. The hinge having damping structure according to claim 10 or 13 is characterized in that the sleeve of the other hinge leaf further has two engaging portions protruding from the inner surface and mutually corresponding. The second cylinder of the aforementioned accumulator unit is provided with a rotating section sleeved in the aforementioned first cylinder, and a limiting section opposite to the rotating section. The aforementioned rotating section has two second notches extending from an end face opposite to the rotating section along the direction of the axis and capable of being fitted into the plurality of engaging portions, and a rectangular hole formed on the end face. The aforementioned shaft member further has an accumulation section that is opposite to the buffer section and has a rectangular cross-section. The aforementioned accumulation section is disposed through the accumulator unit along the direction of the axis and is sleeved into the aforementioned rectangular hole.

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