CN208498492U - A kind of subway operation seat rotation-limited wheel - Google Patents

Abstract

The utility model provides a kind of subway operation seat rotation-limited wheel, including mandrel, compression plate, rotating wheel and the end plate being installed together by fastening bolt；The rotating wheel includes the check wheel and runner being sequentially sleeved on mandrel from the inside to the outside；The check wheel is fixedly connected with mandrel；The runner can be rotated relative to the check wheel, and the same circumference on the runner end face of compression plate is equipped with multiple indexing troughs.Limiting device is connected on the compression plate, the other end of the limiting device can be fallen into and be skidded off in the indexing trough；When the other end of the limiting device falls into the indexing trough, the runner and the compression plate are rigidly connected.The mandrel of the utility model to be fixed with seat, runner is fixed with external structure, and when human body sitting posture changes, seat can be rotated, and is braked by limiting device, the angle of rotation is limited, without manual operation, comfort level that is safe and reliable and improving driver's work.

Description

A kind of subway operation seat rotation-limited wheel

Technical field

The utility model relates to subway operation seat manufacture fields more particularly to a kind of subway to operate seat rotation-limited Wheel.

Background technique

Subway operation seat is that the seat that Metro-Drivers use operates seat due to the limitation in subway cockpit space It often without the chair back, is only made of the panel of a similar ellipse, traditional Chinese chair can only carry out the angle of the chair back manual Adjustment, and the bench of seat is only capable of rotating, and can not brake, therefore subway in the prior art operation seat is often fixation, Angle can not be adjusted, works long hours and driver's physical fatigue is be easy to cause even to cause lumbar vertebral disease.Therefore how to make subway Operation seat can rotate and automatic braking is the current technical issues that need to address.

Summary of the invention

Technical problem to be solved by the utility model is: can not be adjusted to solve subway operation seat in the prior art Angle, the technical issues of be easy to causeing driver's physical fatigue, the utility model provide a kind of subway operation seat and limit Rotating wheel solves the above problems.

The technical scheme adopted by the utility model to solve the technical problem is as follows: a kind of subway operates seat rotation-limited Wheel, including mandrel, the mandrel center have perforative first threaded hole.

Fastening bolt is inserted into first threaded hole from the mandrel front end.

Compression plate is arranged on the mandrel, and is rotated together with mandrel.

End plate is rotated together with mandrel, and the end plate center has through-hole, and end plate front is set in the end of the mandrel The mandrel is stretched out at end, end plate rear portion, and the end plate rear portion is circumferentially arranged at least a pair of of pin hole, and two in each pair of pin hole Pin hole opposite end disk axis is arranged symmetrically.

Rotating wheel is arranged on the mandrel；The rotating wheel includes the check being sequentially sleeved on mandrel from the inside to the outside Wheel and runner；The check wheel is fixedly connected with the mandrel, and check wheel is folded between the compression plate and the end plate；Institute Stating runner can rotate relative to the check wheel, and the same circumference on the runner end face of the compression plate is equipped with Multiple indexing troughs.

Limiting device, described limiting device one end are connect with the compression plate, and the other end supports and is located at the wheel surface, and The other end of the limiting device can be fallen into and be skidded off in the indexing trough；Described in being fallen into when the other end of the limiting device When indexing trough, the runner and the compression plate are rigidly connected.

When work, the runner is fixed in external structure, and remains static, the mandrel, check wheel, end plate and Compression plate is rotated with seat together, when the other end of the limiting device falls into the indexing trough, the runner with it is described Compression plate rigid connection, brakes compression plate, to make and the synkinematic mandrel of the compression plate one, check wheel and end plate system It is dynamic.

Further, through equipped with the second threaded hole, second threaded hole to mandrel axis in the compression side surface Distance be equal to multiple indexing troughs where circumference radius, so that the second threaded hole and the axis of the indexing trough is weighed It closes；The limiting device is fixed in second threaded hole, and can be along the second threaded hole axial stretching；When described When two threaded holes are overlapped with the indexing trough axis, the limiting device is protruded into indexing trough, and make second threaded hole and The indexing trough rigid connection realizes braking to keep runner opposing stationary with compression plate.

Further, the limiting device includes steel ball, spring and screw；The screw is inserted into from the compression plate front end Second threaded hole, the spring is between the tip of screw and the steel ball；The steel ball is located at second spiral shell Inside pit, and supports and be located at the wheel surface；When second threaded hole is overlapped with the indexing groove center, the steel ball It is located in indexing trough and the second threaded hole simultaneously.

Further, the indexing trough is arc or cylindrical recesses, the diameter of the opening of the groove and the steel Pearl diameter is suitable, and the ratio between the depth of groove and the diameter of the steel ball are 0.4~0.6, and steel ball is made to be able to enter but not exclusively fall into Enter the indexing trough, steel ball still is able to skid off indexing trough when firmly rotatably compressing disk.

Preferably, the indexing trough includes the symmetrically arranged two pairs of indexing troughs of the relatively described runner axis, each pair of indexing trough In two indexing troughs between angle be 30 °~45 °.

Further, the runner inner wall is cylindrical surface；The check wheel outer wall Circle-Array shows several wedge-like openings, institute Wedge-like opening is stated by cutting out in the diagonal on the outside of check wheel, is placed with roller, the diameter of the roller in the wedge-like opening vertically Less than the notch maximum width of the wedge-like opening.

Further, it is equipped with the first shoulder close to the compression plate end of the rotating wheel, close to the rotating wheel The end of the end plate is equipped with the second shoulder, and first shoulder and the second shoulder are set in the runner inner wall；It is described inverse Only wheel is fastened between first shoulder and the second shoulder, and between being between the runner and the compression plate and the end plate Gap cooperation.

Further, mandrel periphery is equipped with keyway, and the keyway extends to mandrel end, and the check wheel inner surface has With the matched convex key of the keyway.

Preferably, the mandrel end is stretched out in the fastening bolt end.

Preferably, the mandrel front end has annular block plate, is equipped with bullet between the fastening bolt and the annular block plate Spring pad.

The beneficial effects of the utility model are:

(1) subway described in the utility model operates seat rotation-limited wheel, is equipped on the runner of relative rotation more A indexing trough is fallen into and is skidded off the braking that the indexing trough realizes runner by the other end of limiting device, by the utility model Mandrel fixed with seat, runner is fixed with external structure, when human body sitting posture change when seat can rotate, and by limit dress Braking is set, the limitation of rotational angle only can be realized by the adjustment of sitting posture, without manual operation, safe and reliable and raising is driven The comfort level that employee makees.

(2) subway described in the utility model operates seat rotation-limited wheel, and the rotating wheel is one-way wheel, by Wedge-like opening is arranged in check wheel edge, and runner is made only can to play the role of retaining around the check wheel single direction rotation, avoid driving Member falls down during shaking, and influences normal driving.

(3) subway described in the utility model operates seat rotation-limited wheel, and the limiting device will be pressed by steel ball Tight disk and runner rigid connection, when steel ball is not fallen in indexing trough, steel ball can be rotated in wheel surface, be generated between runner Rolling friction, friction is small；Telescopic may be implemented by spring press in steel ball, and the limit device structure is simple, is easy to add Work, low manufacture cost.

Detailed description of the invention

The present invention will be further described with reference to the accompanying drawings and examples.

Fig. 1 is the decomposition view of the specific embodiment of subway operation seat rotation-limited wheel described in the utility model Figure；

Fig. 2 is the rotating wheel knot of the specific embodiment of subway operation seat rotation-limited wheel described in the utility model Structure schematic diagram；

Fig. 3 is the main view of subway operation seat rotation-limited wheel described in the utility model；

Fig. 4 is A- in Fig. 3 of the specific embodiment of subway operation seat rotation-limited wheel described in the utility model A is to cross-sectional view；

Fig. 5 is A-A in Fig. 3 of the specific embodiment of subway operation seat rotation-limited wheel described in the utility model To cross-sectional view；

Fig. 6 is B-B direction cross-sectional view in Fig. 3 (steel ball does not enter in indexing trough)；

Fig. 7 is B-B direction cross-sectional view in Fig. 3 (steel ball enters in indexing trough).

In figure, 1, mandrel, 1-1, the first threaded hole, 1-2, keyway, 2, fastening bolt, 3, compression plate, 3-1, the second screw thread Hole, 4, end plate, 4-1, through-hole, 4-2, pin hole, 5, rotating wheel, 5-1, runner, 5-11, indexing trough, 5-2, check wheel, 5-21, wedge Shape opening, 5-211, notch, 5-22, convex key, 5-3, roller, 5-4, bearing, 6, limiting device, 6-1, steel ball, 6-2, spring, 6- 3, screw, the 7, first shoulder, the 8, second shoulder, 9, annular block plate, 10, spring pad, 11, plain cushion.

Specific embodiment

The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng The embodiment for examining attached drawing description is exemplary, and is only used for explaining the utility model, and should not be understood as to the utility model Limitation.

In the description of the present invention, it should be understood that term " center ", " width ", "upper", "lower", " preceding ", The orientation or position of the instructions such as " rear ", "left", "right", "vertical", "horizontal", "inner", "outside", " axial direction ", " radial direction ", " circumferential direction " Relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplification of the description, without referring to Show or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot manage Solution is limitation of the present invention.

In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply relatively important Property.In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " connection " should be done It broadly understood, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be mechanical connection, It is also possible to be electrically connected；It can be directly connected, it can also be indirectly connected through an intermediary.For the ordinary skill of this field For personnel, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.

Embodiment 1, such as Fig. 3, Fig. 4, shown in Fig. 6 and Fig. 7, a kind of subway operates seat rotation-limited wheel, including mandrel 1, connecting shaft of the mandrel 1 between compression plate 3, end plate 4 and rotating wheel 5,1 center of mandrel has perforative first threaded hole 1- 1,1 periphery of mandrel is equipped with keyway 1-2, and keyway 1-2 extends to 1 end of mandrel.

Fastening bolt 2 is inserted into the first threaded hole 1-1 from 1 front end of mandrel, 1 front end of mandrel is fixed using M8 bolt.

Compression plate 3 is set on mandrel 1, and is rotated together with mandrel 1, through equipped with the second screw thread on 3 end face of compression plate The distance of hole 3-1, the second threaded hole 3-1 to 1 axis of mandrel is equal to the radius of the circumference where indexing trough 5-11, and compression plate 3 is used It in setting limiting device 6, while being used to block the side of rotating wheel 5, avoids the loosely organized of rotating wheel 5.

End plate 4,4 center of end plate have through-hole 4-1, and 4 front of end plate is set in the end of mandrel 1, revolves together with mandrel 1 Turn, mandrel 1 is stretched out at 4 rear portion of end plate, and 4 rear portion of end plate is circumferentially arranged with a pair of of pin hole 4-2, and two pin hole 4-2 are with respect to 4 axis of end plate It is arranged symmetrically, 4 rear portion of end plate is fixed with the cylindrical bar on seat.

Rotating wheel 5 is set on mandrel 1；Rotating wheel 5 includes the check wheel 5-2 being sequentially sleeved on mandrel 1 from the inside to the outside With runner 5-1；Check wheel 5-2 is folded between compression plate 3 and end plate 4, and check wheel 5-2 inner surface has to be matched with keyway 1-2 Convex key 5-22, keep check wheel 5-2 and mandrel 1 circumferentially fixed, realization rotated together with mandrel 1, convex key 5- can also be not provided with 22, check wheel 5-2 is fastened on completely in keyway 1-2；Runner 5-1 inner ring and the outer ring check wheel 5-2 are cylindrical surface, are turned It is provided with bearing 5-4 between wheel 5-1 and check wheel 5-2, enables runner 5-1 relative to check wheel 5-2 bidirectional rotation, compression plate 3 (minimum range be the compression plate 3 except the first shoulder 7 of removing and the second shoulder 8 herein with the minimum range of 4 end face of end plate With the minimum range of 4 end face of end plate) it is greater than the length of runner 5-1, make to match between runner 5-1 and compression plate 3 and end plate 4 for gap It closes.Same circumference on the end face runner 5-1 of compression plate 3 is equipped with two couples of indexing trough 5-11, realizes seat two symmetrically The angle of position adjusts.Two couples of indexing trough 5-11 are arranged with respect to runner 5-1 axisymmetrical, two in each pair of indexing trough 5-11 Angle between indexing trough 5-11 is 45 °.

Limiting device 6, including steel ball 6-1, spring 6-2 and screw 6-3；Screw 6-3 is inserted into the second spiral shell from 3 front end of compression plate Pit 3-1, screw 6-3 are used to fix one end of limiting device 6, and spring 6-2 is between the end screw 6-3 and steel ball 6-1；Steel Pearl 6-1 is located inside the second threaded hole 3-1, and supports and be located at the surface runner 5-1；Spring 6-2 stretches for realizing limiting device 6 Contracting, the depth and steel ball 6-1 diameter ratio of indexing trough 5-11 are 0.5, therefore when in the second threaded hole 3-1 and indexing trough 5-11 When the heart is overlapped, steel ball 6-1 is located at simultaneously in indexing trough 5-11 and the second threaded hole 3-1, as shown in Figure 7.

The specific embodiment of the present embodiment when seat needs front and back rotation, then will using the angle of driver as visual angle The left side of seat or the horizontal cylinder rod set on right side are located at 4 rear portion of end plate, reuse bolt and are inserted in pin hole 4-2, make seat It is fixed with end plate 4, mandrel 1, compression plate 3, runner 5-1, check wheel 5-2 and end plate 4 are assembled together, spiral shell is fastened by M8 Bolt 2 is fixed up, and steel ball 6-1 and spring 6-2 is passed through the second threaded hole 3-1 and is tightened with screw 6-3, initial brake position For horizontal position, when people turns forward, mandrel 1, compression plate 3, check wheel 5-2 and end plate 4 are rotated together with, when rotation is to 45 ° When, mandrel 1, compression plate 3, check wheel 5-2 and end plate 4 are braked together, so that seat be made to stop rotating, similarly, human body retreats Oblique maximum angle is also 45 °, meanwhile, the present embodiment can be used for the left rotation and right rotation of seat, and be more suitable for left rotation and right rotation Situation, rotation angle can make driver's sitting posture more comfortable and be not easy to slide from seat using 45° angle.For using steel ball 6- 1 braking, and steel ball 6-1 is not fully sunk in indexing trough 5-11, when applying seat compared with noticeable effort, steel ball 6-1 can from point Degree slot 5-11 is skidded off, and continues to adjust the angle.Greater impact power, therefore steel ball 6- will not be generated in driver's driving procedure to seat 1 can brake seat completely and be not easy to loosen, securely and reliably.

Embodiment 2, as shown in Fig. 1-3, Fig. 5-7, a kind of subway operation seat rotation-limited wheel 5, the rotation-limited wheel 5 The case where making seat allow to single direction rotation, being mainly used for front and back adjustment seat, the present embodiment include mandrel 1, and mandrel 1 is to compress Connecting shaft between disk 3, end plate 4 and rotating wheel 5,1 center of mandrel have perforative first threaded hole 1-1, and 1 periphery of mandrel is equipped with Keyway 1-2, keyway 1-2 extend to 1 end of mandrel.

Fastening bolt 2 is inserted into the first threaded hole 1-1 from 1 front end of mandrel, 1 front end of mandrel is fixed using M8 bolt.

Compression plate 3 is set on mandrel 1, and is rotated together with mandrel 1, through equipped with the second screw thread on 3 end face of compression plate The distance of hole 3-1, the second threaded hole 3-1 to 1 axis of mandrel is equal to the radius of the circumference where indexing trough 5-11, and compression plate 3 is used It in setting limiting device 6, while being used to block the side of rotating wheel 5, avoids the loosely organized of rotating wheel 5.

End plate 4,4 center of end plate have through-hole 4-1, and 4 front of end plate is set in the end of mandrel 1, revolves together with mandrel 1 Turn, mandrel 1 is stretched out at 4 rear portion of end plate, and 4 rear portion of end plate is circumferentially arranged with a pair of of pin hole 4-2, and two pin hole 4-2 are with respect to 4 axis of end plate It is arranged symmetrically, 4 rear portion of end plate is fixed with the cylindrical bar on seat.

Rotating wheel 5 is set on mandrel 1；Rotating wheel 5 includes the check wheel 5-2 being sequentially sleeved on mandrel 1 from the inside to the outside With runner 5-1；Check wheel 5-2 is folded between compression plate 3 and end plate 4, and check wheel 5-2 inner surface has to be matched with keyway 1-2 Convex key 5-22, keep check wheel 5-2 and mandrel 1 circumferentially fixed, realization rotated together with mandrel 1；The rotating wheel 5 is one-way wheel, As shown in Figure 2 and Figure 5, specifically, runner 5-1 inner wall is cylindrical surface；Check wheel 5-2 outer wall Circle-Array is shown several wedge shapes and is opened Mouthful, the wedge-like opening 5- that wedge-like opening 5-21 is cut out in the diagonal by the outside check wheel 5-2, therefore radially arranged along check wheel 5-2 21 notch 5-211 is gradually increased, and is placed with roller 5-3 in wedge-like opening 5-21 vertically, and the diameter of roller 5-3 is opened less than wedge shape The notch 5-211 maximum width of mouth 5-21, when roller 5-3 is located at the notch 5-211 maximum width position of wedge-like opening 5-21 When, roller 5-3 still can rotate, and when roller 5-3 is mobile to the tip of wedge-like opening 5-21, due to roller 5-3 diameter Larger, roller 5-3 is stuck in wedge-like opening 5-21 and can not rotate, therefore compression plate 3 only can be with respect to runner 5-1 by wedge-like opening The tip of 5-21 is rotated to notch 5-211 maximum width locality.The minimum range of compression plate 3 and 4 end face of end plate, which is greater than, to be turned The length for taking turns 5-1 makes between runner 5-1 and compression plate 3 and end plate 4 for clearance fit.Close to the end face runner 5-1 of compression plate 3 On same circumference be equipped with two couples of indexing trough 5-11, realize two symmetric positions of seat angle adjustment.Two couples of indexing trough 5- 11 opposite runner 5-1 axisymmetricals are arranged, and the angle between two indexing trough 5-11 in each pair of indexing trough 5-11 is 45 °.

Limiting device 6, including steel ball 6-1, spring 6-2 and screw 6-3；Screw 6-3 is inserted into the second spiral shell from 3 front end of compression plate Pit 3-1, screw 6-3 are used to fix one end of limiting device 6, and spring 6-2 is between the end screw 6-3 and steel ball 6-1；Steel Pearl 6-1 is located inside the second threaded hole 3-1, and supports and be located at the surface runner 5-1；Spring 6-2 stretches for realizing limiting device 6 Contracting, the depth and steel ball 6-1 diameter ratio of indexing trough 5-11 are 0.5.

When seat has the function of front and rear angles adjustment, due to needing to observe front road in driver's driving procedure always Condition, it is therefore desirable to seat can only lean forward, can not hypsokinesis, if seat can bidirectional rotation, when chair tilting driver swing back It is easy to fall down, is easy to cause traffic accident.

Preferably, the first shoulder 7 is equipped with close to 3 end of compression plate of rotating wheel 5, close to the end plate 4 of rotating wheel 5 End be equipped with the second shoulder 8, the first shoulder 7 and the second shoulder 8 are set in runner 5-1 inner wall；Check wheel 5-2 is fastened on Between one shoulder 7 and the second shoulder 8, check wheel 5-2 is compressed by the first shoulder 7 and the second shoulder 8, at the same make the first shoulder 7, The total length of second shoulder 8 and check wheel 5-2 are greater than the length of runner 5-1, realize between runner 5-1 and compression plate 3 and end plate 4 For clearance fit.

Preferably, 1 end of mandrel is stretched out in 2 end of fastening bolt, make the cylindrical bar on 2 end of fastening bolt and seat It is fixed, improve the bonding strength of the utility model and seat.

Preferably, 1 front end of mandrel has annular block plate 9, annular block plate 9 and 1 integral production of mandrel, kept off using annular Disk 9 is more convenient when installing, and annular block plate 9 can resist the component being set on mandrel 1, by the cylinder on mandrel 1 and seat It is fixed using fastening bolt 2 after bar connection, it is equipped with spring 6-2 pad 10 between fastening bolt 2 and annular block plate 9, it is practical to improve this Novel resistance to shock prevents from loosening, and plain cushion 11 can also be arranged between spring pad 10 and annular block plate 9, reduces annular block plate 9 The abrasion on surface.

In the present specification, identical embodiment is not necessarily referring to the schematic representation of the term.Moreover, description Particular features, structures, materials, or characteristics can be combined in any suitable manner in any one or more embodiments.

It is enlightenment, through the above description, related work people with the above-mentioned desirable embodiment according to the utility model Member can carry out various changes and amendments without departing from the scope of the technological thought of the present invention' completely.This invention Technical scope is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.

Claims (10)

1. a kind of subway operates seat rotation-limited wheel characterized by comprising

Mandrel (1), mandrel (1) center have perforative first threaded hole (1-1)；

Fastening bolt (2) is inserted into first threaded hole (1-1) from the mandrel (1) front end；

Compression plate (3) is set on the mandrel (1), and is rotated together with mandrel (1)；

End plate (4) is rotated together with mandrel (1), and end plate (4) center has through-hole (4-1), and end plate (4) front is set in The mandrel (1) is stretched out at the end of the mandrel (1), end plate (4) rear portion, and end plate (4) rear portion is circumferentially arranged at least one Two pin holes (4-2) to pin hole (4-2), and in each pair of pin hole (4-2) are arranged with respect to end plate (4) axisymmetrical；

Rotating wheel (5) is set on the mandrel (1)；The rotating wheel (5) includes being sequentially sleeved at mandrel (1) from the inside to the outside On check wheel (5-2) and runner (5-1)；The check wheel (5-2) is fixedly connected with the mandrel (1), check wheel (5-2) folder It is located between the compression plate (3) and the end plate (4)；The runner (5-1) can revolve relative to the check wheel (5-2) Turn, the same circumference on the end face the runner (5-1) of the compression plate (3) is equipped with multiple indexing troughs (5-11)；

Limiting device (6), described limiting device (6) one end are connect with the compression plate (3), and the other end supports and is located at the runner The surface (5-1), and the other end of the limiting device (6) can fall into and skid off the indexing trough (5-11)；When the limit When the other end of device (6) falls into the indexing trough (5-11), the runner (5-1) and the compression plate (3) are rigidly connected.

2. operating seat rotation-limited wheel by subway described in claim 1, it is characterised in that: compression plate (3) end face Upper to run through equipped with the second threaded hole (3-1), the distance of second threaded hole (3-1) to mandrel (1) axis is equal to multiple described The radius of circumference where indexing trough (5-11)；The limiting device (6) is fixed in second threaded hole (3-1), and energy Enough along the second threaded hole (3-1) axial stretching；When second threaded hole (3-1) and the indexing trough (5-11) axis weight When conjunction, the limiting device (6) is protruded into indexing trough (5-11), and makes second threaded hole (3-1) and the indexing trough (5- 11) it is rigidly connected.

3. operating seat rotation-limited wheel by subway as claimed in claim 2, it is characterised in that: limiting device (6) packet Include steel ball (6-1), spring (6-2) and screw (6-3)；The screw (6-3) is inserted into described second from the compression plate (3) front end Threaded hole (3-1), the spring (6-2) is between the screw end (6-3) and the steel ball (6-1)；Steel ball (the 6- 1) it is internal to be located at second threaded hole (3-1), and supports and is located at the surface the runner (5-1)；When second threaded hole (3-1) When being overlapped with the center the indexing trough (5-11), the steel ball (6-1) is located at indexing trough (5-11) and the second threaded hole (3- simultaneously 1) in.

4. operating seat rotation-limited wheel by subway as claimed in claim 3, it is characterised in that: the indexing trough (5-11) is Arc or cylindrical recesses, the diameter of the opening of the groove is suitable with the steel ball (6-1) diameter, the depth of groove with The ratio between described diameter of the steel ball is 0.4~0.6.

5. operating seat rotation-limited wheel by subway as claimed in claim 3, it is characterised in that: indexing trough (5-11) packet Include two pairs of indexing troughs (5-11) of relatively described runner (5-1) the axisymmetrical setting, two points in each pair of indexing trough (5-11) The angle spent between slot (5-11) is 30 °~45 °.

6. operating seat rotation-limited wheel by subway described in claim 1, it is characterised in that: runner (5-1) inner wall For cylindrical surface；Check wheel (5-2) the outer wall Circle-Array shows several wedge-like openings, and the wedge-like opening (5-21) is by check wheel Cut out on the outside of (5-2), be placed with vertically roller (5-3) in the wedge-like opening (5-21) in the diagonal, the roller (5-3) it is straight Diameter is less than notch (5-211) maximum width of the wedge-like opening (5-21).

7. operating seat rotation-limited wheel by subway as claimed in claim 6, it is characterised in that: close to the rotating wheel (5) The compression plate (3) end be equipped with the first shoulder (7), the end close to the end plate (4) of the rotating wheel (5) is equipped with the Two shoulders (8), first shoulder (7) and the second shoulder (8) are set in the runner (5-1) inner wall；Check wheel (the 5- 2) it is fastened between first shoulder (7) and the second shoulder (8), and the runner (5-1) and the compression plate (3) and described It is clearance fit between end plate (4).

8. operating seat rotation-limited wheel by subway as claimed in claim 2, it is characterised in that: mandrel (1) periphery is equipped with key Slot (1-2), the keyway (1-2) extend to mandrel (1) end, and check wheel (5-2) inner surface has and the keyway (1- 2) matched convex key (5-22).

9. operating seat rotation-limited wheel by subway described in claim 1, it is characterised in that: fastening bolt (2) end Mandrel (1) end is stretched out at end.

10. operating seat rotation-limited wheel by subway described in claim 1, it is characterised in that: mandrel (1) the front end tool Have annular block plate (9), is equipped with spring pad (10) between the fastening bolt (2) and the annular block plate (9).