CN208134514U - Rotational angle locking mechanism - Google Patents

Abstract

A kind of rotational angle locking mechanism (60), for rear-wheel (22) to be locked in the predeterminated position of scooter (100), scooter (100) includes pedal (30) and one end is articulated in the oscillating deck (23) on pedal (30), and the other end of oscillating deck (23) is equipped with rear-wheel (22)；Wherein, rotational angle locking mechanism (60) includes fixing axle (601) and the positioning seat (602) being set on fixing axle (601), sealed seat (603) and the elastic element (604) for supporting in sealed seat (603) side and press on sealed seat (603) sealed seat (603), and sealed seat (603) un-rotatably connect with fixing axle (601)；Positioning seat (602) is installed in oscillating deck (23), and positioning seat (602) has the engaging structure (605) that rotate positioning seat (602) cannot relative to sealed seat (603) when the two combines with setting between sealed seat (603)；The shifting part (413) for pushing sealed seat (603) relative positioning seat (602) to separate is provided in pedal (30).It is compared with the prior art, rotational angle locking mechanism (60), pivot structure is simple, and convenient for operation, and stability is good, can hover over rear-wheel (22) in arbitrary angles and positions.

Description

Rotational angle locking mechanism

Technical field

The utility model relates to a kind of rotational angle locking mechanisms.

Background technique

Scooter not only can be used as the vehicles use, and can come as a kind of amusement and recreation tool using, Amusement characteristic is more and more welcomed by the people and pays close attention to.

Currently, traditional scooter is mainly made of vehicle frame, wheel, handlebar and other connectors.Traditional scooter, vehicle It is connected between rear-wheel and vehicle frame by pivot structure, back wheels of vehicle relative frame is rotated, however, existing pivot structure It is complex, and wheel cannot be hovered in arbitrary angles and positions.

Utility model content

The technical problem to be solved by the utility model is to provide a kind of rotational angle locking mechanisms, it is intended to solve existing In technology, there are existing pivot structure is complex, and wheel cannot be hovered over to the defect in arbitrary angles and positions.

A kind of rotational angle locking mechanism provided by the utility model, for rear-wheel to be locked in the predeterminated position of scooter On, the scooter includes pedal and one end is articulated in the oscillating deck on the pedal, and the other end of the oscillating deck is equipped with The rear-wheel；Wherein, the rotational angle locking mechanism include fixing axle and the positioning seat being set in the fixing axle, it is sealed Seat and the elastic element for supporting in the sealed seat side and press on the sealed seat sealed seat, sealed seat and the fixation Axis un-rotatably connects；The positioning seat is installed in oscillating deck, is arranged between the positioning seat and the sealed seat two Having when person combines prevents the positioning seat from the engaging structure relative to the sealed seat rotation；Setting is useful in the pedal In the shifting part for pushing the relatively described positioning seat separation of sealed seat.

Further, the sealed side surface for seating against the nearly positioning seat is convexly equipped with multiple first lug bosses, multiple First lug boss is arranged around the axis interval of the fixing axle；The positioning seat is convexly equipped with close to a side surface of the sealed seat Multiple second lug bosses, multiple second lug bosses are arranged around the axis interval of the fixing axle；Adjacent first lug boss Between form the rotation stop groove slid in and out for second lug boss, described in second lug boss and the rotation stop groove are constituted Engaging structure.

Further, the side surface close to the sealed seat of the positioning seat is also convexly equipped with a third protrusion portion, institute It states third protrusion portion and multiple second lug bosses is equally spaced around the fixing axle axis, the third protrusion portion is in institute It states the width on positioning seat cross section and is greater than width of second protrusion on the positioning seat cross section；The sealed seat Multiple rotation stop grooves are divided into multiple first rotation stop grooves and at least one second rotation stop groove, first rotation stop groove and second protrusion Portion matches, and second rotation stop groove can at least accommodate the third protrusion portion and adjacent with the third protrusion portion second Lug boss.

Further, the quantity of second rotation stop groove is two on the sealed seat, and two the second rotation stop groove centers exist Angle on the fixing axle axis is 120 ° to 180 °.

It is compared with the prior art, rotational angle locking mechanism provided by the utility model, pivot structure is simple, convenient for behaviour Make, and stability is good, can hover over rear-wheel in arbitrary angles and positions.

Detailed description of the invention

Stereoscopic schematic diagram when Fig. 1 is use state at the scooter of the offer of the utility model embodiment one；

Stereoscopic schematic diagram when Fig. 2 is upright state at the scooter of the offer of the utility model embodiment one；

Fig. 3 is stereoscopic schematic diagram when standing still for a long while state at scooter that the utility model embodiment one provides；

Fig. 4 be the utility model embodiment one provide scooter at can receiving state when stereoscopic schematic diagram；

Fig. 5 is the schematic cross-sectional view for the scooter that the utility model embodiment one provides；

Fig. 6 is the stereoscopic schematic diagram for the foldable assembly that the utility model embodiment one provides；

Fig. 7 is the schematic cross-sectional view in the face I-I in Fig. 6；

Fig. 8 is the pedal decomposition diagram that the utility model embodiment one provides；

Fig. 9 is the decomposition diagram of pedal, oscillating deck and locking device that the utility model embodiment one provides；

Figure 10 is the stereoscopic schematic diagram one for the locking member that the utility model embodiment one provides；

Figure 11 is the stereoscopic schematic diagram two for the locking member that the utility model embodiment one provides；

Figure 12 is scooter oscillating deck, locking device and the rotational angle locking mechanism that the utility model embodiment one provides Decomposition diagram；

Figure 13 is the enlarged drawing in the portion A in Figure 12；

Figure 14 is the schematic top plan view when pedal that the utility model embodiment one provides omits upper cover；

Figure 15 is the enlarged drawing in the portion B in Figure 14；

Figure 16 is the positioning seat that the utility model embodiment two provides；

Figure 17 is the sealed seat that the utility model embodiment two provides.

Main element symbol description

Specific embodiment

In order to which technical problem to be solved in the utility model, technical solution and beneficial effect is more clearly understood, with Lower combination accompanying drawings and embodiments, the present invention will be further described in detail.It should be appreciated that described embodiment is this A part of the embodiment of utility model, instead of all the embodiments.Based on described the embodiments of the present invention, ability Domain those of ordinary skill every other embodiment obtained under the premise of being not necessarily to creative work, belongs to the utility model The range of protection.

In order to make those skilled in the art more fully understand the technical solution of the utility model, below with reference to specific attached drawing The realization of the utility model is described in detail.

For sake of convenience, hereinafter so-called " preceding " " rear " " left side " " right side " "upper" "lower" and attached drawing itself it is forward and backward, left, The right side, upper and lower direction are consistent, but do not play restriction effect to the structure of the utility model.

Unless otherwise defined, the technical term or scientific term used herein is should be in the utility model fields The ordinary meaning that personage with general technical ability is understood.Make in the utility model patent application specification and claims " first ", " second " and similar word are not offered as any sequence, quantity or importance, and are used only to distinguish Different component parts.Equally, the similar word such as "one" or " one " does not indicate that quantity limits yet, but indicates exist at least One.

Stereoscopic schematic diagram at the scooter that Fig. 1 provides for utility model embodiment when use state, Fig. 2 is utility model Stereoscopic schematic diagram at the scooter that embodiment provides when upright state, Fig. 3 are at the scooter that utility model embodiment provides Stand still for a long while stereoscopic schematic diagram when state, Fig. 4 be at scooter that utility model embodiment provides can receiving state when solid show It is intended to.

Embodiment one

As shown in Figures 1 to 4, a kind of scooter 100 provided in this embodiment, including headstock 10, vehicle body 20, front-wheel 21, step on Plate 30, rear-wheel 22, oscillating deck 23 and the locking device 40 being connected on pedal 30.Front-wheel 21 is mounted on vehicle in a manner of rotationally The bottom end of body 20, pedal 30 are articulated in 20 bottom of vehicle body, and the top surface of pedal 30 has the orthogonal one laterally (side D1 in diagram To the substantially front-rear direction of pedal 30 is referred to as first direction D1 below) and one longitudinally (direction D2, substantially pedal in diagram 30 left and right directions is referred to as second direction D2 below), pedal 30 is connected using the direction for being parallel to second direction D2 as axis and vehicle body 20 It connects, and an expanded position (position shown in Fig. 1) and closed position (position shown in Fig. 2 to 4) can be switched to respect to vehicle body 20. 23 front end of oscillating deck is articulated in the bottom of pedal 30 to be parallel to the direction of second direction D2 as axis, and rear-wheel 22 is in a rotatable manner It is mounted on the rear end of oscillating deck 23, pedal 30 can be limited in closed position when vehicle body 20 and pedal 30 close up by locking device 40 It sets, and can be fixed by oscillating deck 23 and pedal 30, is rotated with limiting oscillating deck 23 relative to pedal 30.It is understood that in cunning At wooden handcart 100 when use state, pedal 30 is in the deployed with respect to vehicle body 20, is substantially in 90 ° of angle between the two, at this time Oscillating deck 23 is locked by locking device 40 and pedal 30；It, can be by pedal 30 when scooter 100 is not used and when not in use Opposite vehicle body 20 closes up, i.e., by changing the state of scooter 100 so that scooter 100 is placed, drawn and be stored.

Above-mentioned scooter 100, including vehicle body 20, pedal 30 and oscillating deck 23, pedal 30 is to be parallel to longitudinal direction Vehicle body 20 is articulated in for axis and can be rotated relative between expanded position and closed position, and oscillating deck 23 is to be parallel to longitudinal side To the bottom for being articulated in pedal 30 for axis, pedal 30 can be limited in closed position by locking device 40, and can limit swing Plate 23 is rotated relative to pedal 30, in this way, can be by locking device 40 by pedal 30 and oscillating deck 23 and/or by pedal 30 and vehicle body 20 lockings, to keep the relative position of pedal 30 and vehicle body 20 and pedal 30 and oscillating deck 23, in such manner, it is possible to make scooter 100 expansion use state and gathering upright state, stand still for a long while the switching of state and receiving state, scooter 100 Using more diversification, carries and carrying is more convenient, and space hold is smaller after gathering, convenient for storage.

Referring to Fig. 5 to 8, vehicle body 20 is hollow structure, and cross section is substantially rectangular, and headstock 10 with respect to vehicle body 20 can stretch The top that the mode of contracting configured in vehicle body 20.A column 201 is installed in the bottom end of vehicle body 20, between vehicle body 20 and pedal 30 It is provided with foldable assembly 50.In the present embodiment, foldable assembly 50 includes folding stand 501, closure 502, release the lock operating parts 503, the first spring 504, second spring 505.Folding stand 501 includes sleeve 506 and a pair of of connecting plate 507, and sleeve 506 is set in Column 201 can simultaneously be rotated relative to the axis of column 201, and the front end of connecting plate 507 is connect with sleeve 506, two connecting plates 507 It is parallel to each other.The first connecting shaft 508, the second connecting shaft 509, third is provided with from top to bottom between two connecting plates 507 to connect Spindle 510, the fourth connecting shaft 511, the first, second, third and fourth connecting shaft 508,509,510,511 are set parallel to each other. The axis hole 301 that there is the end of the fourth connecting shaft 511 to be placed in for the front end of pedal 30 is articulated in the 4th connection by axis hole 301 On axis 511, the front end of pedal 30 is provided with an anticreep axis 306.

From Fig. 6 and 7 as can be seen that release the lock operating parts 503 is articulated in the first connecting shaft 508, the bottom of release the lock operating parts 503 End is connect with one end of the first spring 504, and the other end of the first spring 504 is connected in the first connecting shaft 508.Closure 502 Upper end be articulated in the second connecting shaft 509, lower end is connect with one end of second spring 505, and the other end of second spring 505 connects It connects in third connecting shaft 510.The lower end of closure 502 has the buckle slot 512 snapped on anticreep axis 306, release the lock behaviour The bottom end of workpiece 503 is formed with the push rod 513 abutted with the bottom surface of closure 502.It is easily understood that in second spring Under 505 pulling force effect, the lower end of closure 502 is fastened on anticreep axis 306 when pedal 30 is in the deployed, to protect It holds pedal 30 and the relative position of vehicle body 20 is constant；In release the lock operating parts 503, to the pressure of the direction of vehicle body 20, (i.e. edge, which drives, is released The lower end of lock operating parts 503 is swung up) when, push rod 513 supports closure 502 to drive the lower end of closure 502 to put upwards It is dynamic, separate closure 502 with anticreep axis 306.

Referring to Fig. 8 and 9, pedal 30 includes shell 302, and shell 302 includes upper cover 303 and the bottom cover connecting with upper cover 303 304, the rear end of shell 302, which has, offers a sliding slot 305, and sliding slot 305 is parallel to first from 303 top surface center of upper cover edge The direction of direction D1 extends to periphery, and sliding slot 305 runs through the top and bottom of shell 302.Locking device 40 includes locking member It 401, is substantially in the cable 402 and dynamic clamping head and quiet clamping head 403 of rope form, dynamic clamping head and quiet clamping head 403 can be tension spring, and locking member 401 is sliding Dynamic to be arranged in sliding slot 305, one end of cable 402 is connect with the front end of locking member 401, the other end and dynamic clamping head and quiet clamping head 403 Connection, dynamic clamping head and quiet clamping head 403 can when locking member 401 is displaced outwardly to locking member 401 generate another locking member 401 to The elastic reset power that pedal 30 is resetted close to one end of vehicle body 20.Locking member 401 can be in a latched position and a unlocked position Between move, at locking member 401 when latched position, the front side surface of locking member 401 is connected to shell 302 in sliding slot On 305 front side wall, meanwhile, locking member 401 can be such that vehicle body 20 and/or oscillating deck 23 is locked on pedal 30；It is locking It closes unlocked position at component 401, locking member 401 and vehicle body 20 and/or oscillating deck 23 locates unlocked state, in external force Under, vehicle body 20 and/or oscillating deck 23 can be made to be detached from pedal 30 and can be rotated around articulated section relative to pedal 30.

Referring to Figure 10 and 11, locking member 401 includes lock body 404, and lock body 404 has opposite the first face 404a and the Two face 404b, the first face 404a are located at the bottom face of lock body 404, and the second face 404b is located at the top end face of lock body 404, lock body 404 It is formed with a hook 405 in the first face 404a, is clamped for cooperating with the rear end of oscillating deck 23.It is formed with upward on vehicle body 20 The hook component 202 extended is bent, the card for engaging with hook component 202 is provided on the second face 404b of lock body 404 Conjunction portion 406.In this way, can realize being fixedly connected for pedal 30 and oscillating deck 23 by the hook 405 on locking member 401, pass through It holding section 406 can be fixed by pedal 30 and vehicle body 20.

It is noted that locking member 401 is located at latched position, the oscillating deck on the direction for being parallel to first direction D1 23 length abutted with hook 405 are less than the length that hook component 202 is abutted with holding section 406.It is located at lock in locking member 401 Positioning is set, and oscillating deck 23 and hook component 202 engage with locking member 401, and locking member 401 is being parallel to transverse direction Direction on the length that is abutted with oscillating deck 23 be less than locking member 401 on being parallel to lateral direction with hook component 202 The length of abutting.In this way, being slided in unlocking process in locking member 401, since the length that cooperation abuts is different, with locking part Part 401 slides in and out, and oscillating deck 23 is first unlocked with locking member 401, then unlocks vehicle body 20 and locking member 401, that is, Say, unlock can receiving state scooter 100 when, oscillating deck 23 is first separated with pedal 30 and is fixed at pedal 30 and vehicle body 20 Connection, oscillating deck 23 can rotate relative to pedal 30, with select upright state or the state of standing still for a long while carry out using.

Referring to Figure 11, holding section 406 includes the engaging slot for being provided on the second face 404b and being placed in for hook component 202 407, the snap-latch piece 408 with the cooperation clamping of hook component 202 is formed in engaging slot 407, so it is easy to understand that hook component 202 can be placed in engaging slot 407 and cooperate clamping with snap-latch piece 408, and the top surface of pedal 30 can abut with 20 trailing flank of vehicle body, step on Plate 30 is combined more firm with vehicle body 20.

As a further improvement, hook 405 includes head 409 and the company being connected between head 409 and lock body 404 Socket part 410, forms the first recess portion 411 and the second recess portion 412 between lock body 404 and head 409, the first recess portion 411 and second is recessed Portion 412 is located at the opposite sides of interconnecting piece 410.First recess portion 411 for oscillating deck 23 posterior edges be placed in, and with pendulum Movable plate 23 fastens, and the second recess portion 412 then upright state or when standing still for a long while state at scooter 100 can hang and for example do shopping The hangers such as bag, knapsack, shoulder packet, to mitigate the burden of user.

Referring to Figure 12 and 13, as a further improvement, oscillating deck 23 passes through a rotational angle locking mechanism 60 and pedal 30 connections, rotational angle locking mechanism 60 include fixing axle 601 and the positioning seat 602, the sealed seat that are set in fixing axle 601 603 and support in sealed 603 side of seat and press on sealed seat 603 elastic element 604 of sealed seat 603, sealed seat 603 with Fixing axle 601 un-rotatably connects, and elastic element 604 can be pressure spring.Positioning seat 602 is installed in oscillating deck 23, positioning The engaging structure 605 for keeping the two relatively unrotatable is provided between seat 602 and sealed seat 603.In the present embodiment, sealed Seat 603 is convexly equipped with multiple first lug bosses 606 close to a side surface of positioning seat 602, and multiple first lug bosses 606 are around fixation The axis interval of axis 601 is arranged, and rotation stop groove 607 is constituted between the first adjacent lug boss 606；Positioning seat 602 is close to sealed seat 603 side surface is convexly equipped with multiple second lug bosses 608 that can slide in or out the rotation stop groove 607, multiple second protrusions Portion 608 is arranged around the axis interval of fixing axle 601, and matches with the shape of rotation stop groove 607, above-mentioned rotation stop groove 607 and the Two lug bosses 608 constitute engaging structure 605.Locking device 40 further includes shifting part 413, and the front end of shifting part 413 and elasticity are multiple Position part 403 connects, and rear end is connect by cable 402 with locking member 401, in locking member 401 from latched position to solving lock-bit When setting mobile, shifting part 413 can be such that positioning seat 602 separates with sealed 603 phase of seat, then sealed seat 603 can fix axis 601 relatively Rotation.It is noted that shifting part 413 is parallel when positioning seat 602 and sealed seat 603 are from engagement state to discrete state It is greater than 23 phase of hook 405 and oscillating deck when hook 405 engages with oscillating deck 23 in the distance that the side of first direction D1 shifts up The length of abutting, and it is less than the length that hook component 202 abuts against both when engaging with holding section 406, that is to say, that sealed Component 401 slides in unlocking process, will be first between oscillating deck 23 and locking member 401 as locking member 401 slides in and out It is unlocked between positioning seat 602 and sealed seat 603, in this way, can continue to be pulled outwardly after oscillating deck 23 is first separated with pedal 30 Dynamic locking member 401 makes oscillating deck 23 that can turn to scheduled position or angle with respect to pedal 30 around articulated section.

Specifically, one end of the remotely located seat 602 of sealed seat 603 is formed with a convex block 609, the tool of shifting part 413 and convex block 609 abut and when locking member 401 is displaced outwardly along the direction of parallel first direction D1, pushing tow convex block 609 makes sealed seat 603 The inclined-plane 413a mobile to the direction of remotely located seat 602.Shifting part 413 pushes convex block 609 to make this when by outside pulling force Positioning seat 602 is separated relative to sealed seat 603, and the first lug boss 606 and the second lug boss 608 are disengaged from.

Referring to Figure 10 to 15, as further optimizing, the rear end of pedal 30 is provided with a pair of of linkage part 70, sealed Component 401 is located between two linkage parts 70.Two linkage parts 70 are symmetrical set the left and right sides in locking member 401, Each linkage part 70 includes the fixing seat 701 being fixed on pedal 30, clamping joint 702, is connected to fixing seat 701 and clamping joint Elastic arm 703 between 702.The two sides of locking member 401 have been respectively formed on block board 414, projection on each block board 414 There is the protrusion for mutually supporting with the clamping joint.In the present embodiment, on each block board 414 the protrusion quantity of projection be but Three are not limited to, there are three detents, three detents to be staggered with three protrusions for recess on block board 414.Three detents are certainly (direction i.e. from back to front) is respectively the first detent, the second detent and third detent outside to inside, is displaced outwardly in locking member During, when sliding into the first detent after clamping joint 702 crosses outermost protrusion, oscillating deck 23 and locking member 401 are solved Lock；When sliding into the second detent after clamping joint 702 crosses intermediate protrusion, unlocked between positioning seat 602 and sealed seat 603；When Clamping joint 702 is crossed when sliding into third detent after innermost protrusion, and locking member 401 and vehicle body unlock.

As further optimizing, locking member 401 has hand-held part 415, and hand-held part 415 has to be led to for what finger passed through Hole, with user-friendly.

The stateful switchover process of scooter 100 provided by the embodiment of the utility model is illustrated with reference to the accompanying drawing：

When pedal 30 is with respect to expanded position at vehicle body 20, the oscillating deck 23 and locking member 401 for being equipped with rear-wheel 22 block It closes, use state at scooter 100；

When pulling locking member 401 rearward to move, between oscillating deck 23 and pedal 30 and rotational angle locks machine The engaging structure 605 of structure 60 sequentially unlocks, and rotates at pedal 30 to vehicle body 20, is blocked by hook component 202 and locking member 401 Conjunction keeps vehicle body 20 and pedal 30 fixed, and oscillating deck 23 may be selected to hover over the position of state shown in Fig. 2 and Fig. 3；

When needing using scooter 100, pull locking member 401 to unlocked position, during pulling, angle of rotation It spends between the oscillating deck 23 and pedal 30 of locking mechanism 60, sequentially solved between engaging structure 605 and vehicle body 20 and pedal 30 Lock.

Embodiment two

It 16 and 17 only just elaborates with reference to the accompanying drawing with difference in previous embodiment.

The side surface close to sealed seat 603 of positioning seat 602 provided in this embodiment is also convexly equipped with a third protrusion portion 610, third protrusion portion 610 and multiple second lug bosses 608 are equally spaced around 601 axis of fixing axle, and third protrusion portion 610 exists Width on 602 cross section of positioning seat is greater than width of second protrusion 608 on 602 cross section of positioning seat.Sealed seat 603 it is more A rotation stop groove 607 is divided for multiple first rotation stop grooves 611 and the second rotation stop groove 612, the first rotation stop groove 611 and the second lug boss 608 Match, the second rotation stop groove 612 can at least accommodate third protrusion portion 610 and second protrusion adjacent with third protrusion portion 610 Portion 608.It is easily understood that when positioning seat 602 is separated with sealed seat 603, the second lug boss 608 and the first rotation stop groove 611 It is disengaged from, positioning seat 602 can be rotated around 601 axis of fixing axle relative to sealed seat 603, due to the width in third protrusion portion 610 Degree is greater than the first rotation stop groove 611, therefore, when third protrusion portion 610 and the second rotation stop groove 612 are staggered, third protrusion portion 610 Outer end face can be combined to avoid positioning seat 602 with sealed seat 603 on the outer end face of the first lug boss 606 supporting, in turn It is held in position the state that seat 602 can be rotated relative to sealed seat 603.

The width and quantity of second rotation stop groove 612 can be designed as needed, and specifically, second stops on sealed seat 603 The quantity of turn trough 612 is two, and angle of two 612 centers of the second rotation stop groove on 601 axis of fixing axle is 120 ° to 180 °, It, can relatively sealed seat 603 in 120 ° to 180 ° of slewing area in this way, positioning seat 602 is with sealed seat 603 after separating It turns in next second rotation stop groove 612.It is noted that by third protrusion portion 610 and the second rotation stop groove 612, locking After device 40 unlocks, oscillating deck 23 can be switched to preset position and angle and again keep oscillating deck 23 in the position and angle On degree, do not need to apply pulling force to locking member 401 always, and position more accurately and quickly.

The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all practical at this Made any modification, equivalent replacement or improvement etc., should be included in the guarantor of the utility model within novel spirit and principle Within the scope of shield.

Claims (4)

1. a kind of rotational angle locking mechanism, for rear-wheel to be locked in the predeterminated position of scooter, the scooter includes Pedal and one end are articulated in the oscillating deck on the pedal, and the other end of the oscillating deck is equipped with the rear-wheel；Its feature exists In the rotational angle locking mechanism includes fixing axle and the positioning seat being set in the fixing axle, sealed seat and supports The sealed seat side and the elastic element that the sealed seat is pressed on to sealed seat, sealed seat and the fixing axle not can be rotated Ground connection；The positioning seat is installed in oscillating deck, and the positioning seat is with setting between the sealed seat when the two combines Having prevents the positioning seat from the engaging structure relative to the sealed seat rotation；It is provided in the pedal sealed for pushing One shifting part of the relatively described positioning seat separation of seat.

2. rotational angle locking mechanism according to claim 1, which is characterized in that described sealed to seat against the nearly positioning seat A side surface be convexly equipped with multiple first lug bosses, multiple first lug bosses are arranged around the axis interval of the fixing axle；It is described Positioning seat is convexly equipped with multiple second lug bosses close to a side surface of the sealed seat, and multiple second lug bosses are around the fixing axle Axis interval setting；The rotation stop slid in and out for second lug boss is formed between adjacent first lug boss Slot, second lug boss and the rotation stop groove constitute the engaging structure.

3. rotational angle locking mechanism according to claim 2, which is characterized in that the positioning seat close to described sealed One side surface of seat is also convexly equipped with a third protrusion portion, and the third protrusion portion and multiple second lug bosses are around the fixation Axis axis is equally spaced, and width of the third protrusion portion on the positioning seat cross section is greater than second protrusion in institute State the width on positioning seat cross section；Multiple rotation stop grooves of the sealed seat be divided into multiple first rotation stop grooves and at least one second Rotation stop groove, first rotation stop groove match with second lug boss, and second rotation stop groove can at least accommodate described Three lug bosses and second lug boss adjacent with the third protrusion portion.

4. rotational angle locking mechanism according to claim 3, which is characterized in that second rotation stop on the sealed seat The quantity of slot is two, and angle of two the second rotation stop groove centers on the fixing axle axis is 120 ° to 180 °.