TW201323737A - Pivot joint device with cushion - Google Patents

Abstract

The present invention relates to a pivot joint device with a cushion, which comprises a base which comprises a receiving space formed therein to receive a cushion block, and also comprises a support board which has an upper edge forming an abutting section that is located in the receiving space of the base so that the an acting face of the top of the abutting section is in contact with the cushion block. The present invention arranges a damper in the pivot joint device to cushion the strong impact force induced by the pivot joint device rotated to a terminal position when the pivot joint device is opened, thereby achieving cushioning and shock absorbing and reducing the number of repeated impacts of the pivot joint device to prevent an article coupled to the pivot joint device from being damaged due to frequently subjecting to multiple times of repeated impact during the opening of the pivot joint device.

Description

Pivot device with bumper

The present invention relates to a pivoting device having a damper, and more particularly to a damper structure for use in a pivoting device as a terminal stop when the pivoting device is opened.

The known pivoting device is a hinge button for pivoting a door panel on a door frame, a hinge for opening a cover plate on a plane, or a pivoting pivotal connection of a squatable seat cushion on a body of the locomotive, that is, The pivoting device is arranged such that one end of an object can be pivoted on a fixed object by a pivoting device, and the animal piece can be carried by hand so that the object can be rotated by an angle on the fixed object, and the object is rotated to the end stop. The limit is the maximum angle at which the object can be turned.

The pivoting device is applied to the body of the locomotive, and can be used as a hinge for opening and closing the seat cushion. In recent years, it has been designed as a seat cushion that can be automatically opened upwards when unlocked, and is provided in the pivoting device. The torsion spring can pre-twist the torsion spring when the seat cushion is closed and buckled, and when the unlocking and releasing the buckle state, the seat cushion can automatically open upward by the torsional restoring force of the torsion spring, so It can achieve the practical effect of easily accessing the objects under the seat cushion.

Due to the torsion force of the torsion spring pre-twisting, when the user stops and unlocks the seat cushion with the key, the force of the seat cushion to be opened upward by the torsion force of the torsion spring is designed to make the seat cushion open to the maximum. When the angle is opened, the pivoting end of the seat cushion is often opened to the end of the maximum rotation stroke, and directly impacts the pivotal portion of the vehicle body and the hinge, and rebounds back to an angle after the collision. When the torsion force of the torsion spring is counterbalanced, the seat cushion is pushed forward again, so that the seat cushion terminal hits the vehicle body again, so that after several rounds of reciprocating swing and impact, the kinetic energy until the upward split is gradually consumed. After the impact of the body, the seat cushion that is opened upward can be gradually subsided and stopped at the maximum opening position, and since the body of the current locomotive is mostly a plastic shell structure, the positioning of the seat pad pivoting device is combined with the positioning screw. With the positioning of the nut, the seat cushion is opened upwards and the spring is applied by the torsion spring, so that the seat cushion is repeatedly applied to the pivoting device, and the positioning screw and the nut clamp of the pivoting device are clamped. Location, could easily lead to damage because of the complex has long been suffering from recurring impact, therefore, how to absorb the impact of buffer to reduce the impact when the seat opening times, the focus is the design of the present invention.

In order to improve the prior art, the present invention provides a "pivoting device with a damper" comprising a first coupling member having a joint portion and an abutting surface formed at one end of the joint portion, the joint portion being solidified a second joint member pivotally connected to the first joint member, the second joint member includes a joint wall, and the second joint member rotates between the open position and the closed position relative to the first joint member. The connecting wall system is to be fixed on a second object, and the second object is pivoted between the open position and the closed position together with the second joint member, and is fixed on the connecting wall of the second joint member. The base includes a spaced apart inner end surface and an outer end surface, and a first end surface extending between the inner and outer end surfaces, the base includes a mounting groove formed on the inner end surface, and the mounting groove has a proximity to the first a first stop surface of the end surface, the inner end surface of the base abuts against the connecting wall of the second joint member, and is slidably coupled to a plate of the mounting groove of the base, the shelf plate includes an end and is separated from the end a pressing portion, the pressing portion has an active surface An abutting surface is located in the mounting groove and is slidable therein, and the end portion is located outside the first end surface. When the second object is in the open position, the end of the frame plate abuts against the abutting surface of the first coupling member. When the second object is not in the open position, the end of the shelf is away from the abutting surface, and a buffering member is installed between the mounting groove of the base and the active surface of the shelf, when the second coupling is open In the position, the action surface of the shelf is against the cushioning member.

The positioning portion and the fixing portion of the base are disposed in the pivoting device, such as a pivoting end of the locomotive body and the seat cushion, and the pivoting device can contact the bottom end of the shelf when the pivoting device is rotated and rotated to the terminal. The rotating force is transmitted upward through the frame, and the action surface of the pressing portion can press the second bearing surface of the buffer block upward, thereby buffering the impact force when the pivoting device is opened and rotated to the terminal, so that the opening of the pivoting device can be After absorbing the damper of one impact, the number of impacts of the reciprocating oscillation is reduced, and the effect of rapid stabilization is achieved after one impact.

Therefore, the design of the invention can buffer the impact force of the opening of the pivoting device, and can reduce the number of impacts, so as to avoid damage caused by repeated impacts of the object which is fixed together with the pivoting device, so that the excellent effect of prolonging the service life can be achieved.

All of the following drawings are merely illustrative of the basic teachings of the present invention, and the number, position, relationship, and size of the elements constituting the preferred embodiments will be described in the drawings. Post-guided changes are implemented in industry skills. In addition, after reading and understanding the teachings of the present invention, changes in the exact dimensions and size ratios associated with particular strengths, weights, strengths, and the like are also within the skill of the art.

In the different figures, the same reference numerals are used to designate the same or similar elements; in addition, please refer to the text such as "first", "second", "third", "fourth", "fifth", "sixth", "上上", "下下", "前前", "后后", "内", "外外", "端端", "部部", "段段", "Vertical", "外外", "寛度", "Length," "around," "side," "axial," and the like, are used to facilitate the description of the present invention and are merely used to aid in the description of the present invention.

The pivoting device 10 according to the drawings includes a first coupling member 141. As shown in FIG. 1, the first coupling member 141 has a joint portion 143, and the joint portion 143 includes an arc-shaped extending portion 145, an arched sleeve. A barrel 149 is formed on the extension 145. The sleeve 149 includes first and second sides 151, 153 spaced along the axial direction of the sleeve 149. The first side 151 of the sleeve 149 extends in the axial direction of the sleeve 149. The sides of the portion 145 are spaced apart, and the second side 153 is spaced apart from the other side of the extension 145 in the axial direction of the sleeve 149 such that the sleeve 149 is positioned between the two sides of the extension 145, the sleeve 149 further comprising a connection A peripheral surface 154 between the first and second sides 151, 153. Two notches 243 extending to the second side 153 are formed on the outer surface 154 of the sleeve 149. A mounting space 155 extends from the first side 151 of the sleeve 149 in the axial direction of the sleeve 149 but is separated from the second side 153. A mounting groove chamber 157 having an inner ring wall 165 extends from the second side surface 153 in the axial direction of the sleeve 149 but is spaced apart from the installation space 155 to form a space between the first and second chambers 155, 157. a partition wall 159, a partition wall 159 facing the surface of the installation space 155 extending along the axial direction of the sleeve 149 and spaced apart from the first side surface 151, the shaft joint portion 167 having a circular hole extending from the end surface to the partition wall 159 A shaft hole 169, in addition, the installation space 155 includes a large diameter section 161 near the first side surface 151 and having a larger inner diameter, and a small diameter section 163 which is away from the first side surface 151 and has a smaller inner diameter (as shown in FIG. 3). Shown). A card slot 46 extends from the first side 151 in the axial direction of the sleeve 149 to the partition wall 159. The sleeve 149 further includes a C-shaped channel 177 extending from the first side 151 along the axial direction of the sleeve 149. The track 177 includes a first stop wall 179 and a second stop wall 181 spaced apart in the circumferential direction of the axis of the sleeve 149. The first and second stop walls 179, 181 are circumferentially spaced along the axis defined by the sleeve 149. The angle of the opening is about 170°, and the first coupling member 141 has an abutting surface 183. The abutting surface 183 is located between the slot 46 and the second blocking wall 181 in the circumferential direction of the axial direction of the sleeve 149. The recess 152 includes a recess 152 extending from the abutting surface 183 in the circumferential direction of the sleeve 149 in the circumferential direction. The joint portion 143 of the first joint member 141 is provided with a plurality of joint holes 147 for bonding the first joint member 141. The portion 143 is fastened by screws to a first object 130 such as a frame of a motorcycle through a coupling hole 147 (as shown in Fig. 8).

The pivoting device 10 according to the drawings further includes a linkage sleeve 213 disposed in the sleeve chamber 157 of the sleeve 149. The linkage sleeve 213 has a convex collar 217 having an outer diameter slightly smaller than the opening of the sleeve chamber 157. And a sleeve 215 having an outer diameter smaller than the circular tubular shape of the collar ring 217, so that the linkage sleeve 213 is separated from a first wall surface 231 located at the end surface of the collar ring 217 and a second wall surface 233 at the end surface of the sleeve 215. An accommodating space 235 is formed in the axial direction of the sleeve 149 by the second wall surface 233, and an engaging hole 237 extending from the first wall surface 231 along the axial direction of the sleeve 149 to the non-circular hole of the accommodating space 235 is formed. A ring groove 239 is formed in the surface of the casing 215 adjacent to the convex ring 217, and the interlocking sleeve 213 is placed in the mounting groove chamber 157 of the sleeve 149, and the first wall surface 231 of the interlocking sleeve 213 abuts against the side of the partition wall 159.

The pivoting device 10 further includes an end plug 191 pivotally mounted on the sleeve 149. The end plug 191 has a flange 193 having an outer diameter greater than the opening of the mounting slot 157 of the sleeve 149. The end plug 191 further includes A cylindrical sleeve 195 extends from the side surface of the flange 193 along the axial direction of the sleeve 149. The sleeve 195 has a space 197 therein. The sleeve 195 has a spaced inner ring surface 199 and a The outer ring surface 201, the outer diameter of the socket tube 195 is slightly smaller than the inner diameter of the mounting groove chamber 157 of the sleeve 149, and the opposite two convex portions 241 are formed on the outer ring surface 201 of the socket barrel 195, and the end plug 191 is also included A shaft 203 on one side of the flange 193 and located in the space 197 extending in the axial direction of the sleeve 149, and the length of the shaft 203 in the axial direction of the sleeve 149 is smaller than the sleeve 195. The shaft barrel 203 has a circular through hole 211, and the shaft barrel 203 further includes a surrounding wall 207 spaced apart from the through hole 211. The inner diameter of the inner surface 199 of the socket 195 of the end plug 191 is larger than the outer diameter of the outer sleeve 215 of the interlocking sleeve 213, and the outer diameter of the circumferential wall 207 of the shaft 203 of the end plug 191 is smaller than the inner diameter of the accommodating space 235 of the interlocking sleeve 213. The interlocking sleeve 213 and the end plug 191 can form a loose fit.

According to the drawing, the end plug 191 is sleeved in the mounting groove 157 of the sleeve 149, and the flange 193 of the end plug 191 is sealingly abutted against the second side 153 of the sleeve 149 (as shown in FIG. 3). The opposite two protrusions 241 of the end plug 191 are inserted into the opposite slots 243 of the sleeve 149, so that the end plug 191 cannot rotate relative to the sleeve 149, and the socket 195 of the end plug 191 is installed in the sleeve 149. The inner ring wall 165 of the slot chamber 157 and the sleeve 215 of the interlocking sleeve 213, and the shaft barrel 203 extend into the receiving space 235 of the sleeve 215 of the sleeve 215 in a loose fit. As shown in FIG. 3, the shaft barrel 203 forms a gap with the inner wall of the accommodating space 235, the second wall surface 233 forms a gap with the end plug 191 side, and the surface of the sleeve 215 of the interlocking sleeve 213 and the end plug 191. The inner ring surface 199 of the socket 195 forms a continuous gap, and the gap extends into the annular groove 239 on one side of the casing 215, and a series of continuous gaps are filled with damping oil, thereby utilizing damping oil. The viscous property allows the interlocking sleeve 213 to have a damping effect when rotated.

The pivoting device 10 according to the drawings includes a spring 52 coupled to the first coupling member 141, a spring 52, as in the first view, the spring 52 includes a first end 54 spaced along the axial direction of the sleeve 149. A second end 56. The spring 52 is received in the small diameter section 163 of the mounting space 155 of the sleeve 149. The first end 54 of the spring 52 is embedded in the slot 46 of the sleeve 149, and the portion of the spring 52 adjacent to the first end 54 is sleeved. Outside the shaft portion 167 (as shown in FIG. 3), the second end 56 is adjacent to the mounting space 155 and the first side surface 151. Please note that the spring 52 is naturally untwisted at the first and second ends 54, 56. In the state of being installed into the sleeve 149, the spring 52 has not yet generated an elastic force (as shown in Fig. 4).

The pivoting device 10 according to the drawings further includes a shaft 301 pivotally coupled to the first coupling member 141. As shown in the first figure, the shaft 301 includes a first segment 303 extending along the axial direction of the sleeve 149. And a second segment 305, and the outer diameter of the first segment 303 is slightly larger than the second segment 305, wherein the first segment 303 has a head end 304 having a circular cross section, and a second flat portion continuing to form a symmetric flat cut surface along the head end 304. The abutting portion 306, that is, the portion of the first segment 303 except the head end 304 is non-circular, the cross-sectional shape of the flat portion 306 is identical to the shape of the engaging hole 237 of the interlocking sleeve 213, and the second segment 305 has An end 307 having a non-circular cross section (consisting of a round rod having a symmetrical flat section), and a portion of the second section 305 except the end 307 has a circular cross section. The shaft 301 is pivotally disposed in the sleeve 149, and penetrates through the through hole 211 of the second end 305 toward the end plug 191, through the engaging sleeve 213, and through the shaft hole 169 of the shaft 167. And the spring 52 is inserted into the first side 151 of the sleeve 149, so that the circular end 304 of the shaft 301 is pivoted in the through hole 211 of the end plug 191, and the flat portion 306 is located in the engaging hole 237. And the circular portion of the second segment 305 is pivotally disposed in the shaft hole 169, and the end 307 of the second segment 305 is located outside the first side 151 of the sleeve 149 after passing through the spring 52. At this time, the shaft 301 The sleeve 149 can be rotated relative to the sleeve 149, and the engaging portion 306 can cooperate with the engaging hole 237 to simultaneously drive the interlocking sleeve 213 to rotate relative to the end plug 191, because the interlocking sleeve 213 and the end plug 191 are filled with damping oil. Therefore, the shaft 301 and the interlocking sleeve 213 generate a slow rotation with damping.

The pivoting device 10 further includes a ratchet 58 pivotally mounted on the sleeve 149. The ratchet 58 has a toothing 60 formed by a plurality of one-way teeth. The toothing 60 of the ratchet 58 includes a sleeve 149. A first surface 62 and a second surface 64 are axially spaced apart. A cylindrical pivot portion 66 extends from the second surface 64 of the tooth portion 60 along the axial direction of the sleeve 149. The pivot portion 66 includes The end face extends along the axial direction of the sleeve 149 but is spaced from the first surface 62. A cylindrical inner sleeve 69 extends from the second surface 64 of the tooth portion 60 along the axial direction of the sleeve 149. In the space of the cavity 68 of the pivoting portion 66, a notch 72 is formed between the pivoting portion 66 and the second surface 64 of the tooth portion 60 and extends to the receiving groove 68. The ratchet 58 further includes a sleeve 61 The axial direction of the cylinder 149 extends to a non-circular interlocking hole 70 of the recess 68, and the cross-sectional shape of the interlocking hole 70 conforms to the cross-sectional shape of the second section 305 of the shaft 301, and a bump 73 is formed on the tooth portion 60. The second surface 64 is adjacent to one side of the indentation 72.

The ratchet 58 is sleeved on the first side 151 of the sleeve 149. The end of the pivoting portion 66 of the ratchet 58 penetrates into the large diameter section 161 of the mounting space 155 of the sleeve 149, and the second surface of the tooth portion 60 of the ratchet 58 64 abuts the first side 151 of the sleeve 149, and the inner sleeve 69 of the ratchet 58 projects into the spring 52 from the second end 56 of the spring 52. The spring 52 is sleeved on the pivot portion near the second end 56. In the pocket 68 of 66 (as shown in Fig. 3), the second end 56 of the spring 52 is inserted into the notch 72 of the ratchet 58 and abuts against the projection 73 (when the spring 52 is in a free state that has not been twisted) And the end 307 of the second section 305 of the shaft 301 passes through the linking hole 70 of the ratchet 58 and a portion of the end 307 is located outside the first surface 62 of the ratchet 58 when the tab 73 of the ratchet 58 rests against the sleeve On the second retaining wall 181 of 149 (as shown in Figures 4 and 5), when the shaft 301 pivots about the axis of the sleeve 149, the interlocking ratchets 58 are pivoted together, and the projections 73 of the ratchet 58 are in the slots. The pivoting of the ball 177 away from the second retaining wall 181 and adjacent the first retaining wall 179 will twist the second end 56 of the spring 52, further causing the spring 52 to generate a resilient force for resetting, and the closer the bump 73 is When a retaining wall 179, the spring 52 lines produce stronger elastic force.

The pivoting device 10 further includes a second coupling member 80 pivotally connected to the first coupling member 141. The second coupling member 80 has a connecting wall 82 and is coupled to the connecting wall 82 and along the sleeve 149. A first end wall 84A and a second end wall 84B are axially spaced apart. The first end wall 84A has a coupling hole 85. The second end wall 84B has a pivot hole 86. The connecting wall 82 forms two locking holes 90. A pair of positioning holes 75 and two fixing holes 76 are formed between the two locking holes 90. The connecting wall 82 has an end surface 98 formed at a lower edge between the two end walls 84. The second coupling member 80 includes an end surface 98 toward the connecting wall. A first groove 92 and a second groove 94 extending along the first groove 92 are located between the first end wall 84B and the second groove 94, and the second groove 94 is adjacent to the first end wall 84A.

The first end wall 84A of the second coupling member 80 is adjacent to the first side surface 151 of the first coupling member 141, and the second end wall 84B is adjacent to the second side surface 153, so that the sleeve 149 of the first coupling member 141 is located at the first and second sides. Between the end walls 84A, 84B, the coupling hole 85 of the first end wall 84A of the second coupling member 80 is pivotally connected to the end 307 of the shaft 301, and the coupling hole 85 of the first end wall 84B is pivotally connected to the head end 304. The end 307 of the shaft 301 passes out of the coupling hole 85 of the first end wall 84A and is fastened with a fastener 309 such as a C-shaped buckle, so that the shaft 301 cannot be displaced along the axial direction of the sleeve 149, and The first end wall 84A of the second coupling member 80 abuts against the first surface 62 of the ratchet 58 and the first end wall 84B abuts against the surface of the flange 193 of the end plug 191 (as shown in FIG. 3), in addition to the spring 52 The first end 54 is aligned with the first groove 92 of the second coupling member 80, and the second end 56 of the spring 52 and the projection 73 of the ratchet 58 are aligned with the second groove 94 of the second coupling member 80 to enable the second combination The member 80 can pivot between the open position (as shown in Figures 4 and 5) or the closed position (as shown in Figure 9) about the axis 301 about the defined axis. It should be noted that in such a combined state Next, second knot The fitting 80 has not been coupled in conjunction with the ratchet 58 so that the second coupling member 80 is not positioned and can be freely opened in the open position (as shown in Figures 4 and 5) and in the closed position (as shown in Figure 9). Pivot between. In addition, the locking hole 90 of the second coupling member 80 can be screwed to a second object 132 such as a seat cushion of a motorcycle (as shown in Figs. 8 and 9).

The pivoting device 10 according to the drawings includes a triangular fixing member 122 detachably coupled to the ratchet 58. The fixing member 122 has an abutting surface 124 and a circular arc card connected to one end of the abutting surface 124. The joint surface 126 is formed on the engaging surface 126 by a plurality of latching teeth 128 formed by one-way teeth.

When the fixing member 122 is not installed between the ratchet 58 and the second coupling member 80, the second end 56 of the spring 52 is in a state of not being interlocked by the second coupling member 80, so that the spring 52 is in a natural state that has not been twisted. (As shown in Fig. 5), such a design contributes to the assembly of the pivoting device 10. In detail, when the components of the pivoting device 10 are mounted, since the spring 52 does not need to be twisted in advance, the special treatment can be eliminated. The steps of installing the torsion spring 52 in the first and second coupling members 20, 80, and quickly assembling all the components of the pivoting device 10 except the fixing member 122, all components except the fixing member 122 are installed. The fixing member 122 is mounted on the tooth portion 60 of the ratchet 58 and the abutting surface 124 of the fixing member 122 abuts against the surface of the connecting wall 82 of the second coupling member 80, and then the first end wall of the shaft 301 is placed by the tool. The outer end 307 of the 84A rotates the shaft 301 (for example, the needle tongs clamp the end 307 to rotate), and when the shaft 301 rotates, the ratchet 58 is driven to move the projection 73 away from the second retaining wall 181 about the axis of the sleeve 149. The direction pivots (ie, the opposite of the spring direction of the second end 56 of the spring 52) Torsion), further twisting the second end 56 of the spring 52 such that the spring 52 produces a resilient force of the reset (as shown in FIG. 8), due to the design of the one-toothed teeth of the toothing 60 of the ratchet 58, the ratchet 58 is rotated The tooth portion 60 of the ratchet wheel 58 pushes the latching teeth 128 of the fixing member 122 away from the tooth portion 60, so that the ratchet wheel 58 can pivot the boss 73 toward the first blocking wall 179 in a state where the fixing member 122 is mounted, when the spring is made When the torsion generates the appropriate elastic force, when the force applied to the shaft 301 is removed, the elastic force of the spring 52 exerts a force for pivoting the projection 73 of the ratchet 58 toward the second retaining wall 181, so that the tooth portion of the ratchet 58 The latching teeth 128 of the engaging member 122 further position the fixing member 122, so that the spring 52 transmits the elastic force to the second engaging member 80 through the ratchet 58 and the fixing member 122, and elastically retains the second engaging member 80 at Open position. In addition, the second recess 94 of the second coupling member 80 provides a space for the torsion spring 52 to pass through the projection 73 of the ratchet 58 and the second end 56 of the spring 52 such that the second end 56 of the spring 52 has a larger space to be twisted. .

The invention further includes a bumper 12 mounted on the pivoting device 10 for reducing the second coupling member 80 of the pivoting device 10 after the second article 132 is pivoted from the closed position to the open position because The inertia and the reaction force cause the second object 132 to reciprocate a plurality of times. The buffer 12 includes a base 323, a buffer member 395 disposed in the base 323, and a force force for pushing against the buffer member 395. Shelf 373.

Referring to FIGS. 1A and 1B, the base 323 has a spaced outer end surface 325 and an inner end surface 327, and a first end surface 333 and a second extending between the inner and outer end surfaces 327 and 325. The end surface 335 and a third end surface 329 and a fourth end surface 331 extending between the first and second end surfaces 333, 335 and connecting the inner and outer end surfaces 327, 325. The pedestal 323 includes a mounting groove 338 extending from the inner end surface 327 toward the outer end surface 325 but spaced apart from the outer end surface 325. The mounting groove 338 has an accommodating space 353, and the accommodating space 353 includes a first portion adjacent to the first end surface 333. a stop surface 357 and a second stop surface 371 adjacent to the second end surface 335, the mounting groove 338 further includes a slide 339 extending from the second stop surface 371 to the first end surface 333 and extending to the inner end surface 327, at the third end surface Each of the 329 and the fourth end surface 331 has a positioning portion 337 which protrudes outwardly. Each of the positioning portions 337 has a hole 351 therein. The second end surface 335 has a fixing portion 355 protruding outwardly. The fixing portion 355 One of the surfaces has a positioning post 359 that is perpendicular to the inner end surface 327.

The shelf 373 has a sheet-like structure. The shelf 373 has a front surface 375 and a back surface 377. The lower edge of the shelf 373 forms an end 379. The upper edge of the shelf 373 forms a convex portion 391. An upper surface of the pressing portion 391 forms an active surface 393 and an abutting surface 398 spaced apart from the active surface 393. A plurality of concave portions 392 are formed at the active surface 393. Each concave portion 392 separates the active surface 393 into three. Portions, and the dimensional changes of the recesses 392 can change the surface area of the active surface 393. The pressing portion 391 of the frame 373 is placed in the accommodating space 353 of the base 323, the abutting surface 398 abuts against the first blocking surface 357, the working surface 393 is spaced apart from the second blocking surface 371, and the shelf 373 The base 323 is passed through the slide 339 so that the end 379 is located outside the first end surface 333.

The cushioning member 395 is formed by a rectangular block made of a material having elasticity or cushioning effect, such as rubber or silicone rubber. The cushioning member 395 has a first bearing surface 397 and a second bearing surface 399 which are spaced apart from each other. The cushioning member 395 is disposed in the accommodating space 353 of the base 323 and located between the active surface 393 of the bracket 373 and the second blocking surface 371 of the base 323. The first bearing surface 397 of the cushioning member 395 is abutted against the function. Face 393, the second bearing surface 399 abuts against the second stop surface 371.

The base 323 on which the bracket 373 and the cushioning member 395 are attached is fixed on the connecting wall 82 of the second coupling member 80 and adjacent to the side of the sleeve 149 of the first coupling member 141, and the positioning post 359 of the base 323 is embedded. The alignment holes 75 are respectively aligned with the respective fixing holes 76. The two screws are locked into the holes 351 through the connecting wall 82 to fix the base 323. The frame plate 373 and the buffer member 395 are bounded by the connecting wall 82. Within the receiving space 353 of the seat 323, the end of the end 379 of the shelf 373 is located within the recess 152 of the first coupling member 141 such that the bumper 12 pivots with the second coupling member 80 between the open position and the closed position.

For convenience of explanation, it is assumed that the second coupling member 80 is in the open position (if the pivoting device 10 is used on the seat cushion of the motorcycle, then the seat cushion of the motorcycle is in an open state), at this time, the buffer 12 is The end 379 is abutted against the abutment surface 183 of the first coupling member 141 (as shown in Fig. 9). When the force is applied to the second object 132, the second object 132 will drive the second coupling member 80 to pivot about the axis defined by the shaft 301 from the open position (as shown in FIG. 8) to the closed position (as shown in FIG. 10). As shown, the connecting wall 82 of the second coupling member 80 pushes the fixing member 122, further causes the fixing member 122 to push the ratchet 58 to rotate, and the second end 56 of the ratcheting spring 58 is pivoted. Further, the ratchet 58 is driven via the shaft 301. The interlocking sleeve 213 pivots to overcome the elastic force of the spring 52 and the damping effect of the interlocking sleeve 213 relative to the sleeve 149 when the second coupling member 80 and the second member member 132 are pivoted from the open position to the closed position, so that the second combination The member 80 is capable of producing a slow rotation with a damping effect, at which point the end 379 of the bumper 12 pivots with the second coupling member 80 in a direction away from the abutment surface 183 (as shown in Fig. 11).

When the second coupling member 80 is in the closed position (as shown in FIG. 10), the pivoting device 10 can automatically open the seat cushion after being unlocked, and in detail, when the seat cushion is unlocked, the second spring 52 The end 56 pushes the ratchet 58 to pivot the second coupling member 80 from the closed position (as shown in Fig. 10) to the open position (as shown in Fig. 8), while the shaft 301 drives the interlocking sleeve 213 to rotate together. The elastic force generated by the spring 52 needs to overcome the damping effect generated when the linkage sleeve 213 is rotated, so that the second object 132 such as the seat cushion can be opened at an appropriate speed to avoid an accident that the speed is too fast, and when the second coupling member 80 is The first recess 92 of the second coupling member 80 provides a space through which the first end 54 of the spring 52 passes when the open position pivots toward the closed position. In addition, when the second coupling member 80 interlocks the second object 132 to pivot from the closed position to the open position, the end 379 of the shelf 373 of the buffer 12 abuts against the abutting surface 183 of the first coupling member 141, and the second coupling member The inertia of the 80 and the second article 132 due to the pivoting will continue to pivot away from the closed position (ie, beyond the open position), and the base 323 of the bumper 12 continues to displace with the second coupling member 80, but the frame Because the plate 373 is blocked by the abutting surface 183, the acting surface 393 of the frame 373 is elastically deformed against the cushioning member 395 (as shown in FIG. 12), and the elastic force generated by the elastic deformation of the cushioning member 395 cancels the second coupling member. The inertial force generated by the pivoting of the second article 132 and the second article 132 further causes the second coupling member 80 and the second article member 132 to be reset to the open position in the direction of the closed position (as shown in FIG. 9).

The damper 12 of the present invention is used to reduce the pivoting of the second object 132 to the open position after the second object 132 fixed to the second coupling member 80 is pivoted from the closed position to the open position. The number of times of reciprocating shaking (about to reduce the reciprocating motion of the second object 132 such as the locomotive seat cushion to 1 or 2 times), so that the damage of the first object 130 and the first coupling member 141 can be effectively reduced. Probability. When the pivoting device 10 of the present invention is mounted on the locomotive, the lock on the locomotive and the first joint member 141 are generally made of plastic material, so it is quite easy to generate too many sloshing when the seat cushion is opened, the locomotive It is easy to be damaged when it is locked with the first coupling member 14, and the number of times the seat cushion is reciprocated after the installation of the buffer 12 of the present invention is reduced to 1 or 2 times to reduce the locking of the locomotive with the first coupling member 14. The chance of damage.

In addition to being able to cause the second coupling member 80 to produce a rotation having a damping effect, the pivoting device 10 provided with the damper of the present invention is characterized in that the assembly of the pivoting device 10 does not require the use of the jig torsion spring 52 for installation. The design of the detachable fixing member 122 is matched by the ratchet 58 so that the spring 52 can be installed in the pivoting device 10 in a natural state without being twisted, so that the mounting is highly convenient, and the assembly efficiency can be effectively improved. To further reduce manufacturing costs. Furthermore, the spring 52 can also adjust the elastic force generated by the spring 52 by twisting the second end 56 through the rotating ratchet 58. In detail, the weight of the second object 132 fixed to the second coupling member 80 affects the need for the spring 52 to be applied to the spring 52. The elastic force of the second coupling member 80 is because when the spring 52 is too elastic, the pivoting speed of the second object 132 may be too fast and may hit the user. When the spring 52 is too weak, the spring 52 cannot The second object 132 is pivoted by the second coupling member 80. Therefore, when the pivoting device 10 of the present invention is installed and the weight of the second object 132 is found to be heavy, the shaft can be directly transmitted through the shaft with a tool such as a needle-nosed pliers. The end 307 of the 301 rotates the ratchet 58 so that the second end 56 of the spring 52 can be twisted at a larger angle (the projection 73 is pivoted closer to the first retaining wall 179 as indicated by the phantom line in Fig. 8), so that the spring 52 An elastic force sufficient to support the second coupling member 80 to pivot at an appropriate speed is generated, so that the elastic force of the spring 52 can be quickly reinforced without disassembling the pivoting device 10. Conversely, when the pivoting device 10 of the present invention is installed and it is found that the second object 132 combined with the second coupling member 80 is light in weight, the ratchet 58 is reversely rotated through the end 307 of the shaft 301 by a tool such as a needle-nosed pliers. Pushing the tooth portion 60 away from the fixing member 122, and then removing the fixing member 122, the second end 56 of the spring 52 can be completely released (the ratchet wheel 58 rotates toward the elastic direction of the second end 56 of the spring 52), so that the spring 52 is formed. After the untwisted free state, the fixed block 122 is again coupled to the tooth portion 60 of the ratchet 58 and once again the ratchet 58 is rotated through the end 307 of the shaft 301 by a tool such as a needle-nosed pliers. The retaining wall 179 can also quickly adjust the spring 52 to produce a suitable spring force to prevent the second member 132 from moving too fast when the second coupling member 80 is pivoted from the closed position to the open position.

The ratchet 58 of the present invention is designed such that the spring 52 can be assembled without being twisted, and the time for the operator to assemble the pivoting device 10 can be greatly reduced. In addition, the design of the end plug 191 and the interlocking sleeve 213 has a damping effect when the second coupling member 80 rotates, and the manufacturer can easily increase or decrease the length of the sleeve 215 of the interlocking sleeve 213 by changing the length of the sleeve 215 relative to the interlocking sleeve 213. The contact area with the sleeve 149 can easily control the damping effect generated when the interlocking sleeve 213 is pivoted to optimize the adjustment of the weight of the different second object 132 coupled to the second coupling member 80. .

The above basic teachings have been described, and many extensions and variations will be apparent to those of ordinary skill in the art. For example, the size or number of the recesses 392 of the pressing portion 391 may vary, thereby changing the surface area of the active surface 393, that is, when the size of the recess 392 is larger or the number is larger than that shown in the drawing, the surface area of the acting surface 393 When the slab 373 is subjected to the same amount of pressing force, the cushioning member 395 will have a large elastic deformation due to the smaller surface area of the acting surface 393. Similarly, if the size of the recess 392 is smaller than that shown in the figure. When the number is smaller than that shown in the figure, the surface area of the active surface 393 becomes larger, and the buffer block may have less elastic deformation due to the larger surface area of the active surface 393, so that the surface area controlled by the active surface 393 is used. The ability of the bumper 12 of the present invention to absorb or counteract impact forces is adjusted. The mounting groove 338 of the base 323 may not include the slide 339. For example, the accommodating space 353 of the mounting groove 338 extends along the first end surface 333, and the accommodating space 353 is parallel to the surface of the outer end surface 325 or the third or The surfaces of the fourth end faces 329, 331 are provided with grooves, and the bumps are provided on the surface of the corresponding plates of the frame plate 373 so that the bumps are embedded in the grooves, and the pressing portion 391 of the frame plate 373 can also be restricted. It slides in the accommodating space 353 and does not detach from the base 323. Alternatively, the cushioning member 395 may not be a solid rubber block or a rubber block. For example, the cushioning member 395 may be a compression spring mounted between the base 323 and the shelf 373. Or the shape of the cushioning member 395 may be a shape other than a rectangular body, for example, the cushioning member 395 may be a sphere or other geometric shape.

In addition, the buffer 12 of the present invention can be installed not only on the pivoting device 10 shown in the drawings, but the buffer 12 of the present invention can also be mounted with any type of pivoting device 10, but is not limited to a commercially available pivoting device. The device 10 (or hinge), such as the pivoting device 10 of the present invention, may not include the spring 52 and the ratchet 58, although in the absence of the spring 52 and the ratchet 58, the second coupling member 80 cannot interlock the second member 132 automatically. Opening to the open position, but the damper 12 of the present invention still has the effect of absorbing the impact force when the second coupling member 80 is displaced from the closed position to the open position; or the pivoting device 10 of the present invention may not include the interlocking sleeve 213, such The second coupling member 80 does not have a damping effect when the second object member 132 is pivoted to the open position by the closed position, but the damper 12 of the present invention provides an effect of absorbing the impact force.

The present invention disclosed in the specification is intended to be illustrative and not restrictive. The scope of the present invention is defined by the scope of the appended claims, and is not intended to

10. . . Pivot device

12. . . buffer

52. . . spring

46. . . Card slot

54. . . First end

56. . . Second end

58. . . ratchet

60. . . Tooth

62. . . First surface

64. . . Second surface

66. . . Pivot

68. . . Crate

69. . . Inner sleeve

70. . . Linking hole

72. . . gap

73. . . Bump

75. . . Alignment hole

76. . . Fixed hole

80. . . Second joint

82. . . Link wall

84A. . . First end wall

84B. . . Second end wall

85. . . Bonding hole

86. . . Pivot hole

90. . . keyhole

92. . . First groove

94. . . Second groove

98. . . End face

122. . . Fastener

124. . . Abutment surface

126. . . Card joint

128. . . Card tooth

130. . . First object

132. . . Second object

141. . . First joint

143. . . combination

145. . . Extension

147. . . Bonding hole

149. . . Sleeve

151. . . First side

152. . . Concave

153. . . Second side

154. . . Peripheral surface

155. . . Installation space

157. . . Installation slot

159. . . Partition wall

161. . . Large diameter section

163. . . Small diameter section

165. . . Inner ring wall

167. . . Shaft joint

169. . . Shaft hole

170. . . Positioning hole

171. . . Socket

173. . . Concave hole

175. . . Outer ring wall

177. . . Channel

179. . . First barrier

181. . . Second barrier

183. . . Abutment

191. . . End plug

193. . . Flange

195. . . Socket

197. . . space

199. . . Inner annulus

201. . . Outer torus

203. . . Bobbin

207. . . Surrounding wall

211. . . Through hole

213. . . Linkage set

215. . . Shell

217. . . Convex ring

231. . . First wall

233. . . Second wall

235. . . Housing space

237. . . Engagement hole

239. . . Ring groove

241. . . Convex

243. . . Missing slot

301. . . Shaft

303. . . First paragraph

304. . . Head end

305. . . Second paragraph

306. . . Flat

307. . . End

309. . . Fastener

311. . . case

313. . . Inner side

315. . . Outer side

317. . . Crate

318. . . Inner side wall

319. . . Shaft hole

323. . . Pedestal

325. . . Outer end face

327. . . Inner end face

329. . . Third end

331. . . Fourth end

333. . . First end face

335. . . Second end face

337. . . Positioning department

338. . . Mounting slot

339. . . slide

351. . . hole

353. . . Housing space

355. . . Fixed part

357. . . First stop

359. . . Positioning column

371. . . Second stop

373. . . Shelf

375. . . positive

377. . . back

379. . . End

391. . . Compression department

392. . . Concave

393. . . Action surface

395. . . Buffer

397. . . First bearing

398. . . Abutment

399. . . Second bearing surface

1 is an exploded perspective view of a pivoting device having a damper according to the present invention.

Fig. 1A is an exploded perspective view of the damper of the present invention.

Fig. 1B is a perspective view of the damper of the present invention.

Figure 2 is a perspective assembled view of the pivoting device with a buffer of the present invention.

Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2;

Figure 4 is a cross-sectional view taken along line 4-4 of Figure 3.

Fig. 5 is a cross-sectional view taken along line 5-5 of Fig. 3.

Figure 6 is a cross-sectional view taken along line 6-6 of Figure 3.

Fig. 7 is a plan view of Fig. 2.

Figure 8 is a cross-sectional view taken along line 8-8 of Figure 7.

Figure 9 is a cross-sectional view taken along line 9-9 of Figure 7.

Fig. 10 is a cross-sectional view showing the action of pivoting the second engaging member from the open position to the closed position in the state of Fig. 8.

Fig. 11 is a cross-sectional view showing the action of the second coupling member being displaced from the open position to the closed position in the state of Fig. 9.

Fig. 12 is a cross-sectional view showing the action of the damper when the second coupling member is pivoted from the open position to the end remote from the closed position as shown in Fig. 9.

12. . . buffer

323. . . Pedestal

325. . . Outer end face

327. . . Inner end face

329. . . Third end

331. . . Fourth end

333. . . First end face

335. . . Second end face

337. . . Positioning department

338. . . Mounting slot

339. . . slide

351. . . hole

353. . . Housing space

355. . . Fixed part

357. . . First stop

359. . . Positioning column

371. . . Second stop

373. . . Shelf

375. . . positive

377. . . back

379. . . End

391. . . Compression department

392. . . Concave

393. . . Action surface

395. . . Buffer

397. . . First bearing

398. . . Abutment

399. . . Second bearing surface

Claims (8)

A pivoting device having a buffer, comprising a first coupling member (141) having a joint portion (143), and an abutting surface (183) formed at one end of the joint portion (143), the joint portion (143) ) is to be fixed on a first object (130); a second coupling member (80) pivotally connected to the first coupling member (141), and the second coupling member (80) includes a connecting wall (82) The second coupling member (80) is rotated between the open position and the closed position relative to the first coupling member (141), and the connecting wall (82) is to be fixed on a second object (132), the second member (132) pivoting between the open position and the closed position together with the second coupling member (80); a base (323) is fixed to the connecting wall (82) of the second coupling member (80), The base (323) includes a spaced apart inner end surface (327) and an outer end surface (325), and a first end surface (333) extending between the inner and outer end surfaces (327, 325), the base (323) A mounting slot (338) is formed on the inner end surface (327). The mounting slot (338) has a first stop surface (357) adjacent to the first end surface (333) and an inner end surface of the base (323) (327) ) is abutting against the connecting wall (82) of the second joint member (80); a plate (373), sliding The mounting bracket (338) is coupled to the base (323), and the bracket (373) includes an end (379) and a pressing portion (391) spaced apart from the end (379), and the pressing portion (391) has a working surface (393) and an abutting surface (398), the pressing portion (391) is located inside the mounting groove (338) and is slidable, and the end (379) is located outside the first end surface (333), when the second When the object (80) is in the open position, the end (379) of the shelf (373) abuts against the abutment surface (183) of the first coupling member (141) when the second object (80) is not in the open position. The end (379) of the shelf (373) is away from the abutment surface (183); a buffer member (395) is mounted on the mounting groove (338) and the shelf (373) of the base (323). Between the faces (393), when the second coupling member (80) is in the open position, the active surface (393) of the shelf (373) is pressed against the cushioning member (395). A pivoting device having a damper according to claim 1, wherein the shelf (373) includes a front surface (375) and a back surface (377), and the pressing portion (391) is convexly formed on the front surface ( 375), the pressing portion (391) includes an abutting surface (398) between the active surface (393) and the end (379), and the base (323) includes a first portion spaced apart from the first end surface (333) The two end faces (335), the mounting groove (338) includes an accommodating space (353) having a first stop surface (357) formed on the inner end surface (327), and the accommodating space (353) includes a second end surface (335) a second stop surface (371), the mounting groove (338) further includes a slide (339) extending from the first stop surface (357) to the first end surface (333) and extending to the inner end surface (327), The shelf (373) is such that the end (379) is located outside the first end surface (333) through the slide (339); when the cushioning member (395) is not elastically deformed by the frame (373), the shelf (373) The abutting surface (398) abuts against the first stop surface (357), and the abutment surface of the shelf plate (373) when the cushioning member (395) is elastically deformed by the frame plate (373). ) is detached from the first stop surface (357). A pivoting device having a damper according to claim 1, wherein the pressing portion (391) of the shelf (373) includes two recesses (392) extending to the active surface (393) to enable the active surface (393) ) is divided into three parts by each recess (392). The pivoting device with a damper according to claim 1, wherein the joint portion (143) of the first joint member (141) has an extension portion (145), and a sleeve (149) is formed at the extension portion. (145), the sleeve (149) includes a first side (151) and a second side (153) spaced along the axial direction of the sleeve (149), the sleeve (149) further comprising a first connection And a peripheral surface (154) between the second side (151, 153), an installation space (155) extends from the first side (151) of the sleeve (149) along the axial direction of the sleeve (149) but The second side (153) is spaced apart, and the sleeve (149) further includes a card slot (46) extending from the first side (151) along the axial direction of the sleeve (149) and extending to the installation space (155), The two coupling member (80) includes a first end wall (84A) and a second end wall (85) extending perpendicularly from opposite sides of the connecting wall (82), and the sleeve (149) of the first coupling member (141) is located The pivoting device (10) further includes: a spring (52) having a first end (54) and a second end (between the first and first end walls (84B) of the second coupling member (80) 56), the spring (52) is installed in the installation space (155), and the first end (54) is engaged in the card slot (46), The end (56) is adjacent to the first side (151) of the sleeve (149); a ratchet (58) is pivotally mounted on the sleeve (149), the ratchet (58) having a tooth portion formed by a plurality of one-way teeth (60), the tooth portion (60) includes a first surface (62) and a second surface (64) spaced along the axial direction of the sleeve (149), and the ratchet (58) includes a second surface (64) a pivoting portion (66), and a notch (72) formed in the pivoting portion (66), the pivoting portion (66) of the ratchet (58) and the mounting space (155) of the sleeve (149) And the notch (72) is engaged with the second end (56) of the spring (52), and the second end of the torsion spring (52) when the ratchet (58) pivots about the axis defined by the sleeve (149) (56) causing an elastic force; a shaft (301) pivotally disposed on a sleeve (149) of the first coupling member (141), the shaft (301) including a shaft extending along the axial direction of the sleeve (149) The first segment (303) and the second segment (305), the second segment (305) includes a non-circular end (307) remote from the first segment (303), and the first segment of the shaft (301) (303) The first end wall (84A) of the second joint member (80) is pivotally connected, and the end portion (307) is pivotally connected to the first end wall (84B) through the ratchet (58) to make the second joint member (80) ) an axis defined around the shaft (301) Pivoting between an open position and a closed position; a fixing member (122) coupled between the ratchet (58) and the second coupling member (80), the fixing member (122) including an abutting surface (124) and a The card joint surface (126) forms a one-way latching tooth (128) on the latching surface (126), and the abutting surface (124) of the fixing member (122) abuts against the connecting wall of the second joint member (80) (82), the latch (128) is engaged with the tooth portion (60) of the ratchet (58); when the ratchet (58) is rotated in the opposite direction of the elastic direction of the second end (56) of the spring (52), the tooth The portion (60) pushes away the fixing member (122) to disengage the latching teeth (128) of the fixing member (122) from the tooth portion (60) when the ratchet wheel (58) faces the second end (56) of the spring (52). When the elastic direction is rotated, the tooth portion (60) engages the latching teeth (128) of the fixing member (122), so that the fixing member (122) is firmly coupled to the connecting portion (82) and the tooth portion (60) of the ratchet (58). Between when the second coupling member (80) is pivoted from the open position to the closed position, the connecting wall (82) pushes the abutting surface (124) to pivot the fixing member (122) to rotate the ratchet (58) while twisting The second end (56) of the spring (52). A pivoting device having a damper according to claim 4, wherein the ratchet (58) comprises a non-circular interlocking hole (70) formed on the first surface (62), the end of the shaft (301) ( 307) is coupled to the interlocking hole (70), and a portion of the end (307) is located outside the first surface (62). When the shaft (301) rotates, the end (307) of the shaft (301) is linked to the ratchet ( 58) rotating together, when the second coupling member (80) pivots between the open and closed positions, the fixing member (122) rotates together with the ratchet (58), and the ratchet (58) links the shaft (301) Turn together. A pivoting device having a damper according to claim 4, wherein the sleeve (149) further comprises a channel (177) formed on the first side (151), the channel (177) comprising a sleeve (149) an axially spaced apart first retaining wall (179) and a second retaining wall (181), between the outer peripheral surface of the pivoting portion (66) of the ratchet (58) and the second surface (64) And a bump (73) is formed near the notch (72), the bump (73) is located in the channel (177), and the spring (52) when the bump (73) abuts the second barrier (181) The second end (56) is in a natural state that is not twisted, and the second portion of the spring (52) when the bump (73) pivots away from the second barrier wall (181) and approaches the first barrier wall (179) The end (56) is twisted to generate an elastic force, and the closer the protrusion (73) is to the first retaining wall (179), the stronger the spring force is generated. The pivoting device having a damper according to claim 4, wherein the first coupling member (141) further comprises a mounting groove chamber formed on the second side surface (153) and spaced apart from the installation space (155) ( 157), the mounting groove chamber (157) has an inner ring wall (165), and the first coupling member (141) further includes a peripheral surface (154) formed on the peripheral surface (154) and extending to the second side surface (153) and the mounting groove chamber (157) a missing slot (243), the first section (303) of the shaft (301) includes a head end (304) that is away from the second section (305) and is rounded, and is formed at the head end (304) and a non-circular rod-shaped flat portion (306) between the two segments (305), the head end (304) of the shaft (301) is pivotally connected to the first end wall (84A) of the second joint member (80), The pivoting device (10) further includes: a linkage sleeve (213) pivotally disposed in the sleeve (149) of the first coupling member (141), the linkage sleeve (213) including a first wall surface (231) and a a second wall surface (233), and an engaging hole (237) formed in the non-circular hole shape on the first wall surface (231), the flat portion (306) of the shaft (307), and the engaging hole (237) a combination; one end plug (191) is fixed to the second side (153) of the first coupling member (141), and the end plug (191) includes a circle a set of sockets (195) having a space (197) in the socket (195), the sleeve (195) having a spaced inner ring surface (199) and an outer annular surface (201), The inner diameter of the inner annular surface (199) is slightly smaller than the outer diameter of the interlocking sleeve (213), and a convex portion (241) is formed on the outer annular surface (201) of the socket (195), and the end plug (191) is sleeved. The cylinder (195) is located in the mounting groove chamber (157), and the convex portion (241) is engaged with the notch (243) so that the end plug (191) cannot rotate about the axis defined by the sleeve (149), and the shaft (301) The first section (303) is pivotally connected to the end plug (191), and the gap formed between the outer annular surface (201) of the end plug (191) and the interlocking sleeve (213) is coated with damping oil, so that The interlocking sleeve (213) is caused to have a damped rotation relative to the first coupling member (141) when the shaft (301) is interlocked, thereby further causing the second coupling member (80) to produce a damped rotation. The pivoting device with a damper according to claim 7, wherein the linking sleeve (213) includes an accommodating space (235) formed on the second wall surface (233) and extending to the engaging hole (237), The end plug (191) includes a shaft barrel (203) having a circular hole-shaped through hole (211) extending from an end surface of the space (197), and the shaft barrel (203) has a peripheral wall (207) having an outer diameter slightly smaller than that of the end. The inner diameter of the space (235), the first section (303) of the shaft (301) is pivotally connected to the through hole (211), and the shaft cylinder (203) is located in the accommodating space (235), and the surrounding wall ( The gap between the 207) and the accommodating space (235) is to be coated with damping oil, so that the interlocking sleeve (213) produces a damped rotation with respect to the end plug (191).