Armrest lock of seat and automobile seat

Abstract

The invention provides an armrest lock of a seat and an automobile seat. The armrest lock comprises a ratchet wheel, a pawl, a pawl posture adjusting unit and a pawl posture keeping unit. The ratchet wheel is provided with a plurality of locking intervals and a plurality of unlocking intervals, and the locking intervals comprise a first unlocking interval, a second locking interval, a second unlocking interval and a second locking interval which are sequentially and continuously arranged in the first hour hand direction; the pawl posture adjusting unit is configured to be capable of driving the pawl to rotate to different unlocking intervals and different locking intervals of the ratchet wheel, driving the pawl to be engaged with the ratchet wheel when the pawl rotates to the locking interval of the ratchet wheel, and driving the pawl to be disengaged from the ratchet wheel when the pawl rotates to the unlocking interval of the ratchet wheel; the pawl posture adjusting unit is configured to enable the pawl to be kept in a disengaged state with the ratchet wheel in the process of rotating from the first locking interval to the second locking interval in the first hour hand direction, the use comfort requirement of the seat backrest at different pitching angles can be met, and the one-way locking function of the armrest is not affected.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and in particular to an armrest lock for a seat and an automotive seat. Background Technology

[0002] Some car seats, in addition to the sitting / reclining mode, also feature a zero-gravity mode (reclining mode) to enhance comfort. For example... Figure 20 As shown, in the seat-back mode, the angle between the seat back and the seat surface is small, while in the zero-gravity mode, the angle between the seat back and the seat surface is large (close to 180°).

[0003] Currently, the armrests of car seats can be rotated up and down to adjust the angle. When the armrest is rotated into a certain range (hereinafter referred to as the locking range), it is locked in one direction by the armrest lock. It can only be rotated upward from the locking range. When it is rotated upward out of the locking range, it can rotate in both directions. When it is rotated downward back into the locking range and rotated to the lowest position, the engagement of the internal parts of the armrest lock is triggered to achieve one-way locking.

[0004] like Figure 20 As shown, when the armrest is rotated down to its lowest position and the backrest is in the sitting / reclining mode, the armrest is roughly horizontal. However, when the armrest is rotated down to its lowest position and the backrest is in zero-gravity mode, the armrest is tilted upwards at a large angle, which results in a poor passenger experience in zero-gravity mode. Lowering the lowest point of the locking range would prevent the armrest from tilting upwards at a large angle when rotated to its lowest position in zero-gravity mode. However, this would prevent the armrest from rotating down to its lowest position in the sitting / reclining mode due to interference from the seat surface, thus preventing the one-way locking from being triggered and rendering the one-way locking function ineffective.

[0005] Therefore, how to prevent the armrests from tilting upwards at a large angle in zero gravity mode and affecting the user experience without affecting the one-way locking function is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] To solve the above-mentioned technical problems, this application provides an armrest lock for a seat, the armrest lock including a ratchet, a pawl, a pawl posture adjustment unit and a pawl posture holding unit;

[0007] The ratchet has multiple locking intervals and multiple unlocking intervals, including a first unlocking interval, a first locking interval, a second unlocking interval, and a second locking interval arranged sequentially in a first clockwise direction;

[0008] The pawl attitude adjustment unit is configured to: drive the pawl to rotate to different unlocking and different locking ranges of the ratchet; drive the pawl to engage with the ratchet when the pawl rotates to the locking range of the ratchet; and drive the pawl to disengage from the ratchet when the pawl rotates to the unlocking range of the ratchet.

[0009] The pawl posture adjustment unit is configured to enable the pawl to remain disengaged from the ratchet during the process of rotating from the first locking interval to the second locking interval in a first clockwise direction, wherein the first clockwise direction is either clockwise or counterclockwise.

[0010] In one embodiment of the armrest lock of the seat, the pawl posture adjustment unit includes a first partition and a second partition; when the pawl rotates to the first unlocking range, the first partition blocks between the pawl and the ratchet, so that the pawl and the ratchet are in a disengaged state; when the pawl rotates to the second unlocking range, the second partition blocks between the pawl and the ratchet, so that the pawl and the ratchet are in a disengaged state.

[0011] In one embodiment of the armrest lock of the seat, the ratchet includes a first sleeve and a second sleeve arranged sequentially along the axial direction. The inner peripheral surface of the first sleeve is provided with meshing teeth. The first partition and the second partition are provided on the inner peripheral surface of the second sleeve and protrude inward. The inner peripheral surface of the second sleeve is also provided with a first groove and a second groove that are recessed outward. The first partition, the first groove, the second partition, and the second groove are arranged sequentially and continuously along a first clockwise direction.

[0012] In one embodiment of the armrest lock for a seat, the pawl has a pawl body and a pawl stop. The pawl body is located inside the first sleeve, and the outer side of the pawl body is provided with engaging teeth. When the pawl rotates to the first locking range, the pawl stop is located in the first groove. When the pawl rotates to the second locking range, the pawl stop is located in the second groove. When the pawl rotates to the first unlocking range, the outer side of the pawl stop abuts against the inner side of the first partition, causing the pawl and the ratchet to be in a disengaged state. When the pawl rotates to the second unlocking range, the outer side of the pawl stop abuts against the inner side of the second partition, causing the pawl and the ratchet to be in a disengaged state.

[0013] In one embodiment of the armrest lock of the seat, the inner circumferential surface of the second body is provided with an inwardly protruding stop protrusion. In the second clockwise direction, the stop protrusion is located on the side of the first partition portion away from the first groove portion. When the pawl rotates to the limit position in the second clockwise direction, the pawl stop block abuts against the stop protrusion in the second clockwise direction, so that the pawl cannot rotate further in the second clockwise direction. The second clockwise direction is opposite to the first clockwise direction, and the second clockwise direction is either clockwise or counterclockwise.

[0014] In one embodiment of the armrest lock of the seat, the pawl posture adjustment unit further includes a cam, a slide plate, and a connecting spring. The cam and the slide plate are elastically connected by the connecting spring. The slide plate has a cam mounting area at its center and a first radial slide groove located outside the cam mounting area. The cam has a cam body mounted in the cam mounting area. The pawl body is radially slidably mounted in the first radial slide groove. The outer side of the cam body and the inner side of the pawl body slide in cooperation. Furthermore, the outer side of the cam body abuts against the pawl body in a first clockwise direction, so that when the cam rotates relative to the pawl in the first clockwise direction, it can push against the pawl while rotating and sliding radially outward, so that the pawl engages with the ratchet.

[0015] In one embodiment of the armrest lock for a seat, the pawl posture holding unit includes a holding block and a holding spring. The slide plate has a second radial slide groove, the holding block has a holding block body, and the holding block is radially slidably mounted in the second radial slide groove. The slide plate has a holding spring mounting area, and the holding spring is mounted in the holding spring mounting area and can apply an elastic force to the holding block to slide radially inward. When the pawl rotates to the first unlocking interval, the cam abuts against the holding block in a first clockwise direction, preventing the cam from rotating in the first clockwise direction to a position that drives the pawl to engage with the ratchet.

[0016] In one embodiment of the armrest lock of the seat, the retaining block has a first unlocking protrusion, the ratchet has a second unlocking protrusion, and during the process of the pawl rotating from the first unlocking range to the second unlocking range in a first clockwise direction, the second unlocking protrusion can push the first unlocking protrusion outward, causing the retaining block to slide outward radially, so that when the pawl rotates to the second unlocking range, the contact between the retaining block and the cam is released.

[0017] One embodiment of the armrest lock for a seat includes an armrest shaft and a retaining spring. The ratchet has a retaining spring mounting countersunk hole, and the retaining spring is mounted in the retaining spring mounting countersunk hole. The armrest shaft passes through the inside of the retaining spring and the inside of the ratchet. The outer periphery of the armrest shaft has an annular groove, and the retaining spring is engaged in the annular groove to constrain the axial position of the armrest shaft.

[0018] One embodiment of a seat armrest lock includes a transition member, a friction plate, and a damping member. The friction plate is located between one end of the transition member and the ratchet. The friction plate is kinetically connected to the armrest shaft to rotate with the armrest shaft. The damping member is pre-compressed between the ratchet and the friction plate or between the transition member and the friction plate.

[0019] This application provides a car seat, the car seat including a backrest, armrests, and armrest lock, characterized in that the armrest lock is any of the armrest locks described above, the armrest lock is installed on one side of the frame of the backrest, the ratchet of the armrest lock is fixed relative to the backrest, the pawl posture adjustment unit of the armrest lock is connected to the armrest for transmission, so that when the armrest rotates, the pawl of the armrest lock can rotate accordingly; when the pawl is in the first locking range, the angle between the armrest and the backrest is smaller than the angle between the armrest and the backrest when the pawl is in the second locking range.

[0020] The aforementioned armrest lock, because it has a first locking zone and a second locking zone set on the second clockwise side and the first clockwise side of the second unlocking zone respectively, allows the pawl to rotate further to the first locking zone after rotating to the second unlocking zone. This locks the armrest at a position with a smaller angle to the backrest, preventing the armrest from being unable to trigger the one-way locking function due to interference from the seat when the angle between the backrest and the seat is small (e.g., when the seat is in a seat-back mode). Alternatively, it can rotate further to the second locking zone to lock the armrest at a larger angle to the backrest, preventing the armrest from tilting upwards at a large angle and affecting the user experience when the angle between the backrest and the seat is large (e.g., when the seat is in a zero-gravity mode). Attached Figure Description

[0021] Figure 1 Exploded view of the first embodiment of the armrest lock for the seat provided in this application;

[0022] Figure 2 for Figure 1 Front view of the middle ratchet;

[0023] Figure 3 A schematic diagram of the car seat provided in this application in the sitting / reclining mode;

[0024] Figure 4 for Figure 3 A diagram illustrating zero gravity mode;

[0025] Figure 5 for Figure 1 A schematic diagram of the middle slide rail, cam, pawl, and retaining block;

[0026] Figure 6 This is a schematic diagram showing the pawl in the first locking zone;

[0027] Figure 7 This is a schematic diagram showing the pawl in the first unlocking zone;

[0028] Figure 8 This is a schematic diagram showing the pawl in the second unlocking zone;

[0029] Figure 9 This is a schematic diagram showing the pawl in the second locking zone;

[0030] Figure 10 A schematic diagram of the cam, cam sleeve, connecting spring, and handrail shaft;

[0031] Figure 11 A schematic diagram showing the cam, cam sleeve, and connecting spring assembled together;

[0032] Figure 12 This is a schematic diagram of the snap ring, ratchet, and armrest pivot.

[0033] Figure 13 A schematic diagram showing the assembly of the retaining ring, ratchet, and handrail shaft.

[0034] Figure 14 A schematic diagram of the transition component, friction plate, damping component, ratchet, and handrail shaft;

[0035] Figure 15 A cross-sectional view of the transition piece, friction plate, damping piece, ratchet, and handrail shaft assembled together;

[0036] Figure 16 This is a diagram showing the position of the pawl when the handrail is in its highest usable position.

[0037] Figure 17 This is a schematic diagram showing the position of the pawl when the handrail is in its extreme position.

[0038] Figure 18 A schematic diagram of the armrest, armrest lock, and backrest frame of another embodiment of the car seat provided in this application;

[0039] Figure 19 A schematic diagram of another embodiment of the armrest lock for the seat provided in this application, where the pawl is located in the second unlocking zone;

[0040] Figure 20 This is a schematic diagram of an existing car seat.

[0041] The annotations in the attached figures are explained as follows:

[0042] 100 Ratchet, 101 First body, 102 Second body, 102a First groove, 102b First partition, 102c Second groove, 102d Second partition, 102e Stop protrusion, 103 End plate, 104 Ratchet boss, 105 Snap ring mounting countersunk hole, 106 Second unlocking protrusion;

[0043] 200 pawl, 201 pawl body, 202 pawl block;

[0044] 300 cam, 301 cam body, 301a spline hole, 301b cam locking block, 301c cam step, 302 cam boss;

[0045] 400 Retaining block, 401 Retaining block body, 4011 Cam lock groove, 4012 Cam stop step, 402 First unlocking protrusion;

[0046] 500 Slide plate, 501 Cam mounting area, 502 First radial slide, 503 Second radial slide, 504 Retaining spring mounting area, 505 Second connecting spring connecting groove;

[0047] 600 Cam sleeve, 601 Cam boss insertion hole, 602 First connecting spring connecting groove;

[0048] 700 Snap ring, 701 Lug; 800 Armrest shaft, 801 Spline section, 802 Straight groove, 803 Annular groove, 804 Non-circular cross-section section; 900 Connecting spring; 1000 Transition piece, 1001 Ratchet connecting hole, 1002 Mounting countersunk hole, 1003 Bushing connecting hole; 1200 Friction plate, 1201 Inner protrusion; 1300 Damping piece; 1400 Bushing, 1401 Bushing body, 1402 Bushing flange; 1500 Retaining spring.

[0049] 01 Seat surface, 02 Backrest, 03 Armrests. Detailed Implementation

[0050] To enable those skilled in the art to better understand the technical solution of this application, the technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] like Figure 1 As shown, the armrest lock for the seat provided in this application includes a ratchet 100, a pawl 200, a pawl posture adjustment unit, and a pawl posture holding unit. The ratchet 100 and the pawl 200 are provided with meshing teeth that can engage with each other.

[0052] like Figure 2As shown, the ratchet 100 has multiple locking intervals and multiple unlocking intervals, including a first unlocking interval, a first locking interval, a second unlocking interval, and a second locking interval arranged sequentially in a first clockwise direction.

[0053] The pawl attitude adjustment unit is configured to drive the pawl 200 to rotate to different unlocking and locking ranges of the ratchet 100, and to drive the pawl 200 to engage with the ratchet 100 when the pawl 200 rotates to the locking range of the ratchet 100, and to drive the pawl 200 to disengage from the ratchet 100 when the pawl 200 rotates to the unlocking range of the ratchet 100.

[0054] When the pawl 200 engages with the ratchet 100, the ratchet 100 locks the pawl 200. When the pawl 200 disengages from the ratchet 100, there is a gap between the pawl 200 and the ratchet 100. At this time, the ratchet 100 no longer locks the pawl 200, and the pawl 200 can rotate in a first clockwise direction and a second clockwise direction. The first clockwise direction and the second clockwise direction are opposite; one is counterclockwise and the other is clockwise.

[0055] The pawl attitude holding unit is configured to keep the pawl 200 disengaged from the ratchet 100 during the process of rotating the pawl 200 from the first locking zone to the second locking zone in the first clockwise direction.

[0056] like Figure 3 As shown, the car seat provided in this application includes a seat surface 01, a backrest 02, an armrest 03, and the aforementioned armrest lock. The armrest lock is installed on one side of the backrest frame. The pawl attitude adjustment unit of the armrest lock is connected to the armrest drive, so when the armrest is rotated, the pawl 200 of the armrest lock will rotate accordingly, thereby enabling the pawl 200 to switch to different locking and unlocking ranges by rotating the armrest.

[0057] like Figure 3 As shown, to switch the pawl 200 from the first locking zone to the second locking zone, first rotate the armrest in the second clockwise direction (clockwise in the figure) to move it from the first locking position to the first unlocking position. At this time, the pawl 200 rotates from the first locking zone to the first unlocking zone. Then rotate the armrest in the first clockwise direction (counterclockwise in the figure) to move it from the first unlocking position to the second unlocking position. At this time, the pawl 200 rotates from the first unlocking zone to the second unlocking zone. During this process, the pawl 200 will pass through the first locking zone, but due to the holding effect of the pawl posture holding unit, the pawl 200 will not engage with the ratchet 100 when passing through the first locking zone. Then rotate the armrest in the first clockwise direction to move it from the second unlocking position to the second locking position. At this time, the pawl 200 rotates from the second unlocking zone to the second locking zone.

[0058] To switch the pawl 200 from the second locking zone to the first locking zone, first rotate the armrest in the second clockwise direction (clockwise in the diagram) to move it from the second locking position to the first unlocking position. Then, rotate the armrest in the first clockwise direction to move it from the first unlocking position to the second unlocking position. During this rotation, the pawl 200 will pass through the first locking zone. However, due to the holding effect of the pawl posture holding unit, the pawl 200 will not engage with the ratchet 100 when passing through the first locking zone. Finally, rotate the armrest in the second clockwise direction to move it from the second unlocking position to the first locking position. During this rotation, the pawl 200 will pass through the first locking zone.

[0059] When the pawl 200 is in the first locking zone, the angle between the armrest and the backrest is smaller than the angle between the armrest and the backrest when the pawl 200 is in the second locking zone.

[0060] The backrest has a sitting mode and a zero-gravity mode. In the sitting mode, the angle between the backrest and the seat is smaller than that in the zero-gravity mode.

[0061] The aforementioned armrest lock, because it has a first locking zone and a second locking zone respectively set on the second clockwise side and the first clockwise side of the second unlocking zone, allows the pawl 200 to rotate further in the second clockwise direction to the first locking zone after rotating to the second unlocking zone. This locks the armrest at a position with a small angle to the backrest, preventing the backrest from being locked at a small angle to the seat (e.g., when the angle between the backrest and the seat is small). Figure 3 When the backrest is in seated position, if the armrest cannot trigger the one-way locking function due to interference from the seat surface, it can be further rotated clockwise to the second locking zone, thereby locking the armrest at a position with a larger angle to the backrest, thus preventing situations where the angle between the backrest and the seat surface is too large (e.g., when the backrest is in seated position). Figure 4 The image shows a situation where the armrests tilt upwards at a large angle when the backrest is in zero-gravity mode, which affects the user experience.

[0062] It should be noted that the diagram only shows the case of setting two locking zones and two unlocking zones. In actual implementation, more locking zones and more unlocking zones can also be set. As long as there is a locking zone on both the second clockwise side and the first clockwise side of one of the unlocking zones, the pawl 200 can rotate from the unlocking zone to the two locking zones along the second clockwise direction and the first clockwise direction, respectively. This allows the armrest to be locked in different locking zones to meet the comfort requirements of the seat back at different tilt angles.

[0063] Specifically, in the illustrated embodiments, such as Figure 2As shown, the pawl attitude adjustment unit includes a first partition 102b and a second partition 102d. Figure 7 As shown, when the pawl 200 rotates to the first unlocking zone, the first stop 102b blocks between the pawl 200 and the ratchet 100, causing the pawl 200 and the ratchet 100 to be in a disengaged state. Figure 8 As shown, when the pawl 200 rotates to the second unlocking zone, the second stop 102d blocks between the pawl 200 and the ratchet 100, causing the pawl 200 and the ratchet 100 to be in a disengaged state. Alternatively, in addition to using the stop to disengage the pawl 200 and the ratchet 100, the engagement teeth of the ratchet 100 can also be intermittently set to disengage the pawl 200 from the ratchet 100 when it rotates to the unlocking zone.

[0064] Specifically, in the illustrated embodiments, such as Figure 2 As shown, the ratchet 100 includes a first sleeve 101 and a second sleeve 102 arranged sequentially along the axial direction. The meshing teeth of the ratchet 100 (indicated by 101a in the figure) are provided on the inner circumferential surface of the first sleeve 101. A first partition 102b and a second partition 102d are provided on the inner circumferential surface of the second sleeve 102 and protrude inward. The inner circumferential surface of the second sleeve 102 is also provided with a first groove 102a and a second groove 102c that are recessed outward. The first partition 102b, the first groove 102a, the second partition 102d, and the second groove 102c are arranged sequentially and continuously in a first clockwise direction.

[0065] Specifically, in the illustrated embodiments, such as Figure 5 As shown, the pawl 200 includes a pawl body 201. The pawl body 201 is located inside the first housing 101, and the meshing teeth of the pawl 200 (indicated by 201a in the figure) are located on the outer side of the pawl body 201 (i.e., the side of the pawl body 201 near the peripheral wall of the first housing 101). The pawl 200 also includes a pawl stop 202. The pawl stop 202 protrudes from the pawl body 201 into the second housing 102.

[0066] like Figure 6 As shown, when the pawl 200 rotates to the first locking range, the pawl stop 202 is located in the first groove portion 102a, and the pawl 200 engages with the ratchet 100. Figure 7 As shown, when the pawl 200 rotates to the first unlocking zone, the outer side of the pawl stop 202 abuts against the inner side of the first partition 102b, causing the pawl 200 and the ratchet 100 to be in a disengaged state. Figure 8 As shown, when the pawl 200 rotates to the second unlocking zone, the outer side of the pawl stop 202 abuts against the inner side of the second partition 102d, causing the pawl 200 and the ratchet 100 to be in a disengaged state. Figure 9As shown, when the pawl 200 rotates to the second locking interval, the pawl stop 202 is located in the second groove 102c, and the pawl 200 engages with the ratchet 100.

[0067] Specifically, in the illustrated embodiments, such as Figure 5 As shown, the pawl attitude adjustment unit also includes a cam 300 and a slide plate 500. The cam 300 is connected to the armrest drive; when the armrest is rotated, the cam 300 rotates accordingly. The slide plate 500 has a cam mounting area 501 at its center, and the slide plate 500 also has a first radial slide groove 502, which is located outside the cam mounting area 501. The cam 300 includes a cam body 301, which is mounted in the cam mounting area 501. The pawl body 201 is mounted in the first radial slide groove 502 and can slide radially along the first radial slide groove 502. The outer side of the cam body 301 and the inner side of the pawl body 201 are both provided with grooves and protrusions. The protrusion on the outer side of the cam body 301 extends into the groove on the inner side of the pawl body 201, and the protrusion on the inner side of the pawl body 201 extends into the groove on the outer side of the cam body 301. The protrusion on the outer side of the cam body 301 abuts against the protrusion on the inner side of the pawl body 201 in a first clockwise direction and forms a sliding engagement at the contact position (position A in the figure). When the pawl 200 slides radially along the first radial groove 502, the protrusion on the inner side of the pawl body 201 slides along the protrusion on the outer side of the cam body 301.

[0068] like Figure 10 and Figure 11 As shown, the pawl attitude adjustment unit also includes a connecting spring 900. The cam 300 and the slide plate 500 are elastically connected by the connecting spring 900. Specifically, a cam sleeve 600 is provided in the figure. The cam 300 has a cam boss 302 protruding axially from the cam body 301. The cam sleeve 600 is provided with a cam boss connecting hole 601. The cam boss 302 is inserted into the cam boss connecting hole 601, so that the cam sleeve 600 rotates synchronously when the cam 300 rotates. The cam sleeve 600 is provided with a first connecting spring connecting groove 602, and the slide plate 500 is provided with a second connecting spring connecting groove 505 (see...). Figure 11 The two ends of the connecting spring 900 are respectively engaged in the first connecting spring connecting groove 505 and the second connecting spring connecting groove 602, thereby achieving an elastic connection between the cam 300 and the slide plate 500. Alternatively, the cam sleeve 600 can be omitted, and the first connecting spring connecting groove 602 can be directly set on the cam 300.

[0069] When the pawl 200 is in the locking range of the ratchet 100, when the cam 300 rotates in the first clockwise direction, it pushes the pawl 200 to rotate in the first clockwise direction and pushes the pawl 200 to slide radially outward, thus engaging the pawl 200 and the ratchet 100. When the cam 300 rotates in the second clockwise direction, the slide plate 500 rotates with it under the pull of the connecting spring 900, thus causing the pawl 200 to rotate while sliding radially inward, thereby disengaging from the ratchet 100. After the cam 300 is released, the cam 300 returns to its original position in the first clockwise direction under the elastic force of the connecting spring 900, back to the position that drives the pawl 200 and the ratchet 100 to engage. It should be noted that because the connecting spring 900 has elastic deformation, when the cam 300 rotates in the second clockwise direction, the rotation of the slide plate 500 is not synchronized with the rotation of the cam 300.

[0070] When the ratchet 100 and pawl 200 are engaged, the ratchet 100 locks the pawl 200. At the same time, the pawl 200 stops the cam 300, preventing the cam 300 from rotating in the first clockwise direction. However, this does not affect the rotation of the cam 300 in the second clockwise direction. Therefore, the handrail can be locked in one direction, preventing it from rotating in the first clockwise direction but allowing it to rotate in the second clockwise direction.

[0071] Specifically, in the illustrated embodiments, such as Figure 5 As shown, the pawl attitude holding unit includes a holding block 400 and a holding spring 1500. A slide plate 500 has a second radial slide groove 503 located outside the cam mounting area 501. The holding block 400 has a holding block body 401 mounted on the second radial slide groove 503, and the holding block 400 can slide radially along the second radial slide groove 503. The slide plate 500 has a holding spring mounting area 504, and the holding spring 1500 is mounted on the holding spring mounting area 504 and can provide the holding block 400 with an elastic force that allows it to slide radially inward.

[0072] like Figure 7 As shown, when the pawl 200 rotates to the first unlocking range, the ratchet 100 and the pawl 200 disengage under the block of the first partition 102b. The cam body 301 abuts against the retaining block body 401 in the first clockwise direction. Under the abutment of the retaining block body 401, the cam 300 cannot rotate in the first clockwise direction to the position that drives the pawl 200 to engage with the ratchet 100. Therefore, the ratchet 100 and the pawl 200 can be kept in the disengaged state.

[0073] More specifically, in the illustrated embodiments, such as Figure 7As shown, a cam locking block 301b is provided on the outer side of the cam body 301, and a cam locking groove 4011 is provided on the inner side of the retaining block body 401. When the pawl 200 rotates to the first unlocking range, the cam locking block 301b extends into the cam locking groove 4011. The cam locking block 301b abuts against one side wall of the cam locking groove 4011 in the first clockwise direction. Under the abutment of this side wall of the cam locking groove 4011, the cam 300 cannot rotate in the first clockwise direction to the position that drives the pawl 200 to engage with the ratchet 100. The positions of the cam locking groove 4011 and the cam locking block 301b can be interchanged. When the cam 300 rotates in the second clockwise direction, the cam locking block 301b can abut against the other side wall of the cam locking groove 4011 in the second clockwise direction. Alternatively, the cam locking groove 4011 and the cam locking block 301b can also be replaced with... Figure 19 The cam stop step 4012 and cam step 301c shown are located on the first clockwise side of the cam step 301c. When the pawl 200 rotates to the first unlocking range, the cam step 301c abuts against the cam stop step 4012 in the first clockwise direction.

[0074] Specifically, in the illustrated embodiments, such as Figure 5 As shown, the retaining block 400 has a first unlocking bump 402, as... Figure 2 As shown, the ratchet 100 has a second unlocking protrusion 106. The pawl 200 rotates from the first unlocking range towards the second unlocking range in a first clockwise direction (i.e., from...). Figure 7 The state rotates in the first clockwise direction to Figure 8 (In the process of the state), the second unlocking protrusion 106 can push the first unlocking protrusion 402 outward, causing the retaining block 400 to slide radially outward, so that when the pawl 200 rotates to the second unlocking range, the retaining block 400 releases its contact with the cam 300. Figure 8 As shown, when the pawl 200 rotates to the second unlocking range, the pawl 200 and the ratchet 100 disengage under the block of the second partition 102d, so that the ratchet 100 no longer locks the pawl 200, and the retaining block 400 no longer abuts against the cam 300. Therefore, the cam 300 can rotate in both directions at this time, which can rotate in the second clockwise direction to drive the pawl 200 to rotate to the first locking range, and can also rotate in the first clockwise direction to drive the pawl 200 to rotate to the second locking range.

[0075] More specifically, in the illustrated embodiments, such as Figure 2 As shown, the ratchet 100 includes an end plate 103, which is disposed at the end of the second sleeve 102 away from the first sleeve 101. A second unlocking protrusion 106 protrudes axially from the end plate 103 into the second sleeve 102. Figure 4As shown, the first unlocking protrusion 402 protrudes axially from the retaining block body 401 into the interior of the second body 102.

[0076] It should be noted that the structure of the pawl attitude adjustment unit and the pawl attitude holding unit described above is only an example. In actual implementation, the structure of the pawl attitude adjustment unit and the pawl attitude holding unit can be flexibly adjusted, as long as the corresponding adjustment function and holding function can be achieved. For example, the slide plate 500 can also be replaced by a flat plate, and the sliding of the pawl 200 along the first radial slide 502 can be replaced by the rotation of the pawl 200 around the connecting shaft on the flat plate.

[0077] Specifically, in the illustrated embodiments, such as Figure 10 As shown, the handrail lock includes a handrail shaft 800, which is connected to the handrail and a cam 300, allowing the cam 300 to rotate with the handrail. More specifically, in the illustrated embodiment, the handrail shaft 800 has a splined section 801, and the cam body 301 has a splined hole 301a at its center. The handrail shaft 800 and the cam body 301 are connected via the splined section 801 and the splined hole 301a. The handrail shaft 800 also has a non-circular cross-section section 804, and the handrail has a non-circular hole. The non-circular cross-section section 804 passes through the non-circular hole and can be further welded to it. It should be noted that the above-described transmission connection structure between the handrail shaft 800, the handrail, and the cam 300 is only an example. In actual implementation, the transmission connection structure between the handrail shaft 800, the handrail, and the cam 300 can be flexibly adjusted, as long as it ensures that the handrail rotation can drive the handrail shaft 800 and the cam 300 to rotate synchronously. For example... Figure 18 In the middle, the armrest shaft 800 and the armrest are connected by a spline joint to achieve transmission.

[0078] Specifically, in the illustrated embodiments, such as Figure 12 and Figure 13 As shown, the handrail lock includes a retaining ring 700 and a ratchet 100 with a retaining ring mounting countersunk hole 105. The retaining ring 700 is mounted in the retaining ring mounting countersunk hole 105. Due to the inner circumferential contour of the retaining ring mounting countersunk hole 105, the retaining ring 700 and the ratchet 100 will not rotate relative to each other. The retaining ring 700 has two inwardly protruding lugs 701. The handrail shaft 800 passes through the inside of the retaining ring 700 and the inside of the ratchet 100. The outer circumference of the handrail shaft 800 has an annular groove 803. The two lugs 701 are engaged in the annular groove 803. When the handrail shaft 800 has an axial tendency to move, the lugs 701 abut against the side wall of the annular groove 803, axially limiting the handrail shaft 800 and preventing the handrail shaft 800 from disengaging from the cam 300.

[0079] Specifically, in the illustrated embodiments, such as Figure 14As shown, the handrail lock includes a transition member 1000, a friction plate 1200, and a damping member 1300. The friction plate 1200 is located between the transition member 1000 and the ratchet 100; more specifically, the friction plate 1200 is located between the transition member 1000 and the end plate 103 of the ratchet 100. The friction plate 1200 has two inwardly protruding inner protrusions 1201, and the handrail shaft 800 has two straight grooves 802. The two inner protrusions 1201 are engaged with the two straight grooves 802, realizing a transmission connection with the handrail shaft 800, thereby allowing it to rotate with the handrail shaft 800. The damping member 1300 is pre-compressed between the ratchet 100 and the friction plate 1200, or pre-compressed between the transition member 1000 and the friction plate 1200. In this way, the friction plate 1200 is axially compressed by the damping element 1300, and a large frictional torque is generated when it rotates. The frictional torque is transmitted to the handrail through the handrail shaft 800, so that the handrail can be suspended when it rotates to any position within the stroke range.

[0080] Specifically, in the illustrated embodiments, such as Figure 14 As shown, the transition piece 1000 has a ratchet connecting hole 1001, and the ratchet 100 has a ratchet boss 104. The ratchet boss 104 is inserted into the ratchet connecting hole 1001. More specifically, the ratchet boss 104 protrudes from the end plate 103 of the ratchet 100 toward the transition piece 1000. The transition piece 1000 is welded flush with the ratchet 100. The transition piece 1000 can be fixedly connected to the frame of the backrest 02. The fixing connection method is not limited, such as threaded fastener connection or welding.

[0081] Specifically, in the illustrated embodiments, such as Figure 15 As shown, the transition piece 1000 has a flange, which encloses to form a mounting countersunk hole 1002. The friction plate 1200 and the damping member 1300 are installed in the mounting countersunk hole 1002. The depth of the mounting countersunk hole 1002 is less than the sum of the thicknesses of the friction plate 1200 and the damping member 1300. In this way, when the transition piece 1000 is welded flat to the ratchet 100, the damping member 1300 is in a compressed state. The figure also shows a bushing 1400, and the flange of the transition piece 1000 also surrounds to form a bushing connection hole 1003. The bushing 1400 includes a bushing body 1401 and a bushing flange 1402 that folds outward from one end of the bushing body 1401. The bushing body 1401 is installed in the bushing connection hole 1003, and the bushing flange 1402 abuts against the bottom of the mounting countersunk hole 1002 and the friction plate 1200 to prevent the friction plate 1200 from directly rubbing against the transition piece 1000.

[0082] Specifically, in the illustrated embodiments, such as Figure 3 As shown, the handrail has the highest usable position, such as... Figure 16 As shown, when the armrest is rotated to the highest usable position, the pawl block 202 is located in the first groove 102a and abuts against the first partition 102b in the second clockwise direction.

[0083] Specifically, in the illustrated embodiment, the handrail has extreme positions, such as... Figure 17 As shown, the inner circumferential surface of the second body 102 is provided with an inwardly protruding stop protrusion 102e. In the second clockwise direction, the stop protrusion 102e is located on the side of the first partition 102b away from the first groove 102a. When the armrest is in the extreme position, the pawl block 202 abuts against the stop protrusion 102e in the second clockwise direction, so that the pawl 200 cannot rotate further in the second clockwise direction.

[0084] The foregoing has provided a detailed description of the present application. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of the present application. It should be noted that those skilled in the art can make various improvements and modifications to the present application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A type of armrest lock for a chair, characterized in that, The handrail lock includes a ratchet (100), a pawl (200), a pawl posture adjustment unit, and a pawl posture holding unit; The ratchet (100) is provided with multiple locking intervals and multiple unlocking intervals, including a first unlocking interval, a first locking interval, a second unlocking interval and a second locking interval arranged sequentially in a first clockwise direction; The pawl attitude adjustment unit is configured to: drive the pawl (200) to rotate to different unlocking and different locking ranges of the ratchet (100); drive the pawl (200) to engage with the ratchet (100) when the pawl (200) rotates to the locking range of the ratchet (100); and drive the pawl (200) to disengage from the ratchet (100) when the pawl (200) rotates to the unlocking range of the ratchet (100). The pawl posture adjustment unit is configured to enable the pawl (200) to remain disengaged from the ratchet (100) during the process of rotating from the first locking interval in a first clockwise direction to the second locking interval, wherein the first clockwise direction is either clockwise or counterclockwise.

2. The armrest lock of the seat according to claim 1, characterized in that, The pawl attitude adjustment unit includes a first partition (102b) and a second partition (102d). When the pawl (200) rotates to the first unlocking range, the first partition (102b) is positioned between the pawl (200) and the ratchet (100), so that the pawl (200) and the ratchet (100) are in a disengaged state. When the pawl (200) rotates to the second unlocking range, the second partition (102d) is positioned between the pawl (200) and the ratchet (100), so that the pawl (200) and the ratchet (100) are in a disengaged state.

3. The armrest lock of the seat according to claim 2, characterized in that, The ratchet (100) includes a first sleeve (101) and a second sleeve (102) arranged sequentially along the axial direction. The inner circumferential surface of the first sleeve (101) is provided with meshing teeth. The first partition (102b) and the second partition (102d) are provided on the inner circumferential surface of the second sleeve (102) and protrude inward. The inner circumferential surface of the second sleeve (102) is also provided with a first groove (102a) and a second groove (102c) that are recessed outward. The first partition (102b), the first groove (102a), the second partition (102d), and the second groove (102c) are arranged sequentially in a first clockwise direction.

4. The armrest lock of the seat according to claim 3, characterized in that, The pawl (200) has a pawl body (201) and a pawl stop (202). The pawl body (201) is located inside the first sleeve (101), and the outer side of the pawl body (201) is provided with meshing teeth. When the pawl (200) rotates to the first locking interval, the pawl stop (202) is located in the first groove (102a). When the pawl (200) rotates to the second locking interval, the pawl stop (202) is located in the second groove (102a). 02c), when the pawl (200) rotates to the first unlocking range, the outer side of the pawl stop (202) abuts against the inner side of the first partition (102b), so that the pawl (200) and the ratchet (100) are in a disengaged state; when the pawl (200) rotates to the second unlocking range, the outer side of the pawl stop (202) abuts against the inner side of the second partition (102d), so that the pawl (200) and the ratchet (100) are in a disengaged state.

5. The armrest lock of the seat according to claim 4, characterized in that, The inner circumferential surface of the second body (102) is provided with an inwardly protruding stop protrusion (102e). In the second clockwise direction, the stop protrusion (102e) is located on the side of the first partition (102b) away from the first groove (102a). When the pawl (200) rotates to the limit position in the second clockwise direction, the pawl stop block (202) abuts against the stop protrusion (102e) in the second clockwise direction, so that the pawl (200) cannot rotate further in the second clockwise direction. The second clockwise direction is opposite to the first clockwise direction. The second clockwise direction is either clockwise or counterclockwise.

6. The armrest lock of the seat according to claim 4, characterized in that, The pawl attitude adjustment unit further includes a cam (300), a slide plate (500), and a connecting spring (900). The cam (300) and the slide plate (500) are elastically connected by the connecting spring (900). The slide plate (500) has a cam mounting area (501) at its center and a first radial groove (502) located outside the cam mounting area (501). The cam (300) has a cam body (301) mounted on a cam. In the wheel mounting area (501), the pawl body (201) is radially slidably mounted in the first radial groove (502). The outer side of the cam body (301) and the inner side of the pawl body (201) are slidably engaged. The outer side of the cam body (301) abuts against the pawl body (201) in the first clockwise direction, so that when the cam (300) rotates relative to the pawl (200) in the first clockwise direction, it can push against the pawl (200) while rotating and sliding radially outward, so that the pawl (200) engages with the ratchet (100).

7. The armrest lock of the seat according to claim 6, characterized in that, The pawl attitude holding unit includes a holding block (400) and a holding spring (1500). The slide plate (500) is provided with a second radial slide groove (503). The holding block (400) has a holding block body (401). The holding block (400) is radially slidably mounted in the second radial slide groove (503). The slide plate (500) is provided with a holding spring mounting area (504). The holding spring (1500) is mounted in the holding spring mounting area (504) and can apply an elastic force to the holding block (400) to slide radially inward. When the pawl (200) rotates to the first unlocking interval, the cam (300) abuts against the holding block (400) in the first clockwise direction, so that the cam (300) cannot rotate in the first clockwise direction to the position that drives the pawl (200) to engage with the ratchet (100).

8. The armrest lock of the seat according to claim 7, characterized in that, The retaining block (400) has a first unlocking protrusion (402), and the ratchet (100) has a second unlocking protrusion (106). During the process of the pawl (200) rotating from the first unlocking interval to the second unlocking interval in a first clockwise direction, the second unlocking protrusion (106) can push the first unlocking protrusion (402) outward, so that the retaining block (400) slides outward in a radial direction, so that when the pawl (200) rotates to the second unlocking interval, the contact between the retaining block (400) and the cam (300) is released.

9. The armrest lock of the seat according to any one of claims 1-8, characterized in that, The handrail lock includes a handrail shaft (800) and a retaining ring (700). The ratchet (100) is provided with a retaining ring mounting countersunk hole (105). The retaining ring (700) is installed in the retaining ring mounting countersunk hole (105). The handrail shaft (800) passes through the inside of the retaining ring (700) and the inside of the ratchet (100). The outer periphery of the handrail shaft (800) is provided with an annular groove (803). The retaining ring (700) is engaged in the annular groove (803) to constrain the axial position of the handrail shaft (800).

10. The armrest lock of the seat according to claim 9, characterized in that, The handrail lock includes a transition member (1000), a friction plate (1200), and a damping member (1300). The friction plate (1200) is located between the transition member (1000) and one end of the ratchet (100). The friction plate (1200) is connected to the handrail shaft (800) for transmission so as to rotate with the handrail shaft (800). The damping member (1300) is pre-compressed between the ratchet (100) and the friction plate (1200) or between the transition member (1000) and the friction plate (1200).

11. A car seat, the car seat comprising a seat surface, a backrest, armrests, and armrest locks, characterized in that, The armrest lock is the armrest lock according to any one of claims 1-10. The armrest lock is installed on one side of the frame of the backrest. The ratchet (100) of the armrest lock is fixed relative to the backrest. The pawl posture adjustment unit of the armrest lock is connected to the armrest drive so that when the armrest rotates, the pawl (200) of the armrest lock can rotate with it. When the pawl (200) is in the first locking interval, the angle between the armrest and the backrest is smaller than the angle between the armrest and the backrest when the pawl (200) is in the second locking interval.

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