Back opening stick with continuously adjustable headrest height

Abstract

The utility model discloses a back-opening stick with a continuously adjustable headrest height. The back-opening stick comprises a telescopic rod, a headrest and a screwing assembly, wherein the telescopic rod is telescopically arranged in a first stick in a penetrating manner; the headrest is rotatably arranged on the telescopic rod; the screwing assembly comprises a fixing sleeve and a screwing sleeve. The fixing sleeve is provided with a hollow inner cavity, the first roller is provided with a hollow structure, and the fixing sleeve is fixed to the top end of the first roller to form a shuttle channel for the telescopic rod to stretch out and draw back. The screwing sleeve is arranged outside the fixing sleeve in a sleeving manner; eccentric locking structures matched with each other are arranged between the screwing sleeve and the fixing sleeve, and each eccentric locking structure comprises an elastic tongue piece arranged on the peripheral side wall of the fixing sleeve and a locking protruding block arranged on the inner peripheral wall of the screwing sleeve in a protruding mode. The screwing sleeve is screwed, the locking protruding block abuts against the first tongue part of the elastic tongue piece, and the elastic tongue piece extrudes the outer wall of the telescopic rod so as to lock the telescopic rod. When the screwing sleeve is screwed reversely, the locking convex block leaves the first tongue part of the elastic tongue piece, and the elastic tongue piece releases the outer wall of the telescopic rod; the headrest has the advantage that the height of the headrest can be continuously, easily and accurately adjusted.

Description

Technical Field

[0001] The utility model relates to a body correction device, in particular to a back-opening stick with a headrest whose height can be continuously adjusted, which is used for opening shoulders, beautifying backs and correcting spinal morphology. Background Art

[0002] The back-opening stick, also known as the body stick, yoga stick, posture correction stick, etc., has two crossed sticks. The user leans against the vertical stick and hooks the horizontal stick with his elbows backward, thereby opening the shoulders and beautifying the back, correcting the spinal shape, etc.

[0003] For example, the posture corrector disclosed in the invention patent with the authorization announcement number CN114396419B includes a connector, a first stick and a second stick. The connector includes a first connection seat, a second connection seat and an axle pin. The first connection seat and the second connection seat are connected by the axle pin. The first stick is inserted into the first through hole of the first connection seat, and the second stick is inserted into the second through hole of the second connection seat. The axle pin radially passes through the first stick and the second stick in sequence. The first connection seat and the second connection seat are pulled apart and rotated relatively. The first connection seat and the second connection seat can be switched between two states. In the first state, the first stick and the second stick are parallel to each other; in the second state, the first stick and the second stick are staggered to form a cross.

[0004] In order to further correct the neck shape, some open-back sticks add a headrest or neck support at the upper end of the vertical stick. For example, the utility model patent with authorization announcement number CN220736108U discloses a body correction training device, in which a neck and headrest is arranged on the second body stick. The user can use the neck and headrest to prevent the head from tilting during training and relieve neck pain.

[0005] There are two problems with the existing back-opening stick with a headrest: first, different users have different heights, and some users like to lean their necks against the stick, while other users like to lean their heads against the stick. If the height of the headrest is fixed, or even if it can be adjusted, it cannot be adjusted continuously and easily, and cannot well meet the user's needs for precise correction; second, when the first stick and the second stick are stored parallel to each other, the headrest is still horizontal relative to the two vertical sticks after being stored, which destroys the portability of the back-opening stick for storage and carrying. Utility Model Content

[0006] In view of the problems that the height of the headrest of the existing open-back sticks with headrests or neck rests cannot be adjusted continuously, easily and accurately, and the headrest cannot be stored together with the stick, the technical problem to be solved by the utility model is to provide an open-back stick with an adjustable headrest, the height of which can be adjusted continuously, easily and accurately, and can be rotated relative to the stick to switch between a horizontal state and a vertical state.

[0007] The technical solution adopted by the utility model to solve the above technical problems is: the back-opening stick with continuously adjustable headrest height comprises a first stick and a second stick, wherein the first stick and the second stick can be switched between a first state parallel to each other and a second state perpendicular to each other;

[0008] The device also includes a telescopic rod telescopically inserted into the first stick, a headrest rotatably mounted on the telescopic rod, and a screw assembly for adjusting the height of the headrest; the headrest can rotate relative to the telescopic rod to switch between a vertical state parallel to the telescopic rod and a horizontal state perpendicular to the telescopic rod;

[0009] The screwing assembly includes a fixing sleeve and a screwing sleeve; the fixing sleeve has a hollow inner cavity running through from top to bottom, the first stick has a hollow structure, the fixing sleeve is fixed to the top of the first stick, and the hollow inner cavity of the fixing sleeve and the hollow structure of the first stick form a shuttle channel for the telescopic rod to extend and retract;

[0010] The screw sleeve is arranged outside the fixing sleeve and can be screwed circumferentially relative to the fixing sleeve; a mutually cooperating eccentric locking structure is arranged between the screw sleeve and the fixing sleeve, and the eccentric locking structure switches between locking or loosening the telescopic rod by screwing the screw sleeve;

[0011] The eccentric locking structure includes an elastic tongue piece arranged on the peripheral side wall of the fixing sleeve and a locking protrusion protruding on the inner peripheral wall of the screwing sleeve; the screwing sleeve is screwed so that the locking protrusion abuts against the first tongue portion of the elastic tongue piece, and the elastic tongue piece squeezes the outer wall of the telescopic rod to lock the telescopic rod; the screwing sleeve is screwed in the reverse direction so that the locking protrusion leaves the first tongue portion of the elastic tongue piece, and the elastic tongue piece loosens the outer wall of the telescopic rod, so that the telescopic rod can be telescoped in the shuttle channel.

[0012] The preferred technical solution adopted by the utility model to solve the above technical problems is: a window communicating with the hollow inner cavity is opened on the peripheral side wall of the fixing sleeve, the first end of the elastic tongue is a free end, and the second end of the elastic tongue is connected to the side of the window;

[0013] The elastic tongue piece includes a second tongue portion close to the second end and the first tongue portion far away from the second end, and the thickness of the first tongue portion is greater than the thickness of the second tongue portion; the locking protrusion leaves the first tongue portion and comes to the second tongue portion, and the elastic tongue piece loosens the outer wall of the telescopic rod;

[0014] The extending direction of the locking protrusion is consistent with the width direction of the elastic tongue.

[0015] The preferred technical solution adopted by the utility model to solve the above technical problem is: the elastic tongue piece further includes a third tongue portion close to the first end;

[0016] The side edge of the window protrudes outward from the second end of the elastic tongue piece to form a second limiting groove; the third tongue portion protrudes outward from the first tongue portion to form a first limiting groove;

[0017] The screwing sleeve is screwed so that the locking protrusion abuts against the first tongue portion of the elastic tongue piece, and the first limiting groove is used to limit the locking protrusion from separating from the elastic tongue piece; the screwing sleeve is screwed in the opposite direction so that the locking protrusion leaves the first tongue portion of the elastic tongue piece, and the second limiting groove is used to limit the locking protrusion within the window.

[0018] The preferred technical solution adopted by the utility model to solve the above technical problems is: a portion of the top end of the fixing sleeve extends upward to form a first positioning end face and a second positioning end face at both ends thereof; a positioning block is convexly provided at the top end of the inner peripheral wall of the screwing sleeve;

[0019] The screwing sleeve is screwed so that the locking protrusion abuts against the first tongue portion of the elastic tongue piece, and the positioning block abuts against the first positioning end surface; the screwing sleeve is screwed in the reverse direction so that the locking protrusion leaves the first tongue portion of the elastic tongue piece, and the positioning block abuts against the second positioning end surface.

[0020] The preferred technical solution adopted by the utility model to solve the above technical problems is: a first plane is provided on the side wall of the telescopic rod along the telescopic direction, and a second plane matching the first plane is provided on the inner peripheral wall of the fixed sleeve; the first plane and the second plane match to limit the circumference of the telescopic rod;

[0021] A plurality of height indication marks are arranged on the first plane; and a plurality of anti-slip grooves are arranged on the outer peripheral wall of the screw sleeve.

[0022] The preferred technical solution adopted by the utility model to solve the above technical problems is: the fixing sleeve comprises an upper sleeve part and a lower sleeve part, and the lower sleeve part is used to be fixed to the top end of the first stick;

[0023] The inner diameter of the lower sleeve portion is greater than the inner diameter of the upper sleeve portion, so as to form a first limiting step on the peripheral side wall of the hollow inner cavity;

[0024] A second limiting step is protruding from the bottom end of the telescopic rod, and the second limiting step abuts against the first limiting step to limit the bottom end of the telescopic rod within the shuttle channel.

[0025] The preferred technical solution adopted by the utility model to solve the above technical problems is: a rotating head is arranged at the top of the telescopic rod, and the rotating head is provided with a central through hole, and a rotating shaft passes through the central through hole to connect with the headrest, and when the headrest rotates relative to the rotating head, the rotating shaft rotates in the central through hole;

[0026] An annular track is provided on the outer periphery of the central through hole, and four ball grooves are concavely provided on the four directions of the annular track; two pressing columns are provided on the back side of the headrest, and springs are placed in the pressing columns, and a ball is held between each pressing column and the rotating head;

[0027] When the headrest rotates relative to the rotating head, the balls roll in the annular track; the two balls enter the two opposite ball grooves respectively to lock the headrest in a vertical state or a horizontal state; the spring elastically acts on the balls to make the balls enter and exit the ball grooves.

[0028] Another technical solution adopted by the utility model to solve the above technical problems is: an open-back stick with continuously adjustable headrest height comprises a first stick and a second stick, wherein the first stick and the second stick can be switched between a first state parallel to each other and a second state perpendicular to each other;

[0029] The device also includes a telescopic rod telescopically inserted into the first stick, a headrest rotatably mounted on the telescopic rod, and a screw assembly for adjusting the height of the headrest; the headrest can rotate relative to the telescopic rod to switch between a vertical state parallel to the telescopic rod and a horizontal state perpendicular to the telescopic rod;

[0030] The screwing assembly includes a fixing sleeve and a screwing sleeve; the fixing sleeve has a hollow inner cavity running through from top to bottom, the first stick has a hollow structure, the fixing sleeve is fixed to the top of the first stick, and the hollow inner cavity of the fixing sleeve and the hollow structure of the first stick form a shuttle channel for the telescopic rod to extend and retract;

[0031] The screw sleeve is arranged outside the fixing sleeve and can be screwed circumferentially relative to the fixing sleeve; a mutually cooperating eccentric locking structure is arranged between the screw sleeve and the fixing sleeve, and the eccentric locking structure switches between locking or loosening the telescopic rod by screwing the screw sleeve;

[0032] The eccentric locking structure comprises an elastic tongue piece arranged on the peripheral side wall of the fixing sleeve and a locking protrusion convexly arranged on the inner peripheral wall of the screwing sleeve;

[0033] A window communicating with the hollow inner cavity is provided on the peripheral side wall of the fixing sleeve, the first end of the elastic tongue piece is a free end, and the second end of the elastic tongue piece is connected to the side of the window;

[0034] The elastic tongue piece comprises a second tongue portion close to the second end and a first tongue portion far from the second end, and the thickness of the first tongue portion is greater than the thickness of the second tongue portion;

[0035] The screwing sleeve is screwed so that the locking protrusion abuts against the first tongue portion of the elastic tongue piece, and the elastic tongue piece squeezes the outer wall of the telescopic rod to lock the telescopic rod; the screwing sleeve is screwed in the opposite direction so that the locking protrusion leaves the first tongue portion of the elastic tongue piece and comes to the second tongue portion, and the elastic tongue piece loosens the outer wall of the telescopic rod, and the telescopic rod can be telescoped in the shuttle channel.

[0036] Another preferred technical solution adopted by the utility model to solve the above technical problem is: the elastic tongue piece further includes a third tongue portion close to the first end;

[0037] The side edge of the window protrudes outward from the second end of the elastic tongue piece to form a second limiting groove; the third tongue portion protrudes outward from the first tongue portion to form a first limiting groove;

[0038] The screwing sleeve is screwed so that the locking protrusion abuts against the first tongue portion of the elastic tongue piece, and the first limiting groove is used to limit the locking protrusion from separating from the elastic tongue piece; the screwing sleeve is screwed in the opposite direction so that the locking protrusion leaves the first tongue portion of the elastic tongue piece, and the second limiting groove is used to limit the locking protrusion within the window.

[0039] Another preferred technical solution adopted by the utility model to solve the above technical problem is: a portion of the top end of the fixing sleeve extends upward to form a first positioning end face and a second positioning end face at both ends thereof; a positioning block is convexly provided at the top end of the inner peripheral wall of the screwing sleeve;

[0040] The screwing sleeve is screwed so that the locking protrusion abuts against the first tongue portion of the elastic tongue piece, and the positioning block abuts against the first positioning end surface; the screwing sleeve is screwed in the reverse direction so that the locking protrusion leaves the first tongue portion of the elastic tongue piece, and the positioning block abuts against the second positioning end surface.

[0041] Another preferred technical solution adopted by the utility model to solve the above technical problem is: the side wall of the telescopic rod is provided with a first plane along the telescopic direction, and the inner peripheral wall of the fixed sleeve is provided with a second plane matching the first plane; the first plane and the second plane match to limit the circumferential direction of the telescopic rod;

[0042] A plurality of height indication marks are arranged on the first plane; and a plurality of anti-slip grooves are arranged on the outer peripheral wall of the screw sleeve.

[0043] Another preferred technical solution adopted by the utility model to solve the above technical problem is: the fixing sleeve comprises an upper sleeve part and a lower sleeve part, and the lower sleeve part is used to be fixed to the top end of the first stick;

[0044] The inner diameter of the lower sleeve portion is greater than the inner diameter of the upper sleeve portion, so as to form a first limiting step on the peripheral side wall of the hollow inner cavity;

[0045] A second limiting step is protruding from the bottom end of the telescopic rod, and the second limiting step abuts against the first limiting step to limit the bottom end of the telescopic rod within the shuttle channel.

[0046] Another technical solution adopted by the utility model to solve the above technical problem is preferably: a rotating head is arranged at the top of the telescopic rod, and the rotating head is provided with a central through hole, and a rotating shaft passes through the central through hole to connect with the headrest, and when the headrest rotates relative to the rotating head, the rotating shaft rotates in the central through hole;

[0047] An annular track is provided on the outer periphery of the central through hole, and four ball grooves are concavely provided on the four directions of the annular track; two pressing columns are provided on the back side of the headrest, and springs are placed in the pressing columns, and a ball is held between each pressing column and the rotating head;

[0048] When the headrest rotates relative to the rotating head, the balls roll in the annular track; the two balls enter the two opposite ball grooves respectively to lock the headrest in a vertical state or a horizontal state; the spring elastically acts on the balls to make the balls enter and exit the ball grooves.

[0049] Compared with the prior art, the advantages of the utility model are: the back-opening stick with continuously adjustable headrest height provided by the utility model can lock the telescopic rod at any position in its length direction by using the eccentric locking structure between the screw sleeve and the fixed sleeve, and on the basis of realizing the adjustable headrest height, further remove the height restriction of the fixed gear, thereby realizing continuous adjustment of the headrest height, accurately meeting the needs of users with different body shapes and different abutment parts. And only need to screw the screw sleeve back and forth, and use the interference fit between the locking protrusion, the elastic tongue and the outer wall of the telescopic rod to lock the headrest height, which is easy and simple to operate.

[0050] Furthermore, the headrest can rotate relative to the telescopic rod to switch between a horizontal state and a vertical state. When it is in a vertical state parallel to the telescopic rod and the first stick, the headrest together with the open-back stick with continuously adjustable headrest height can be stored into a bundle, which is convenient to carry and saves storage space. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described object and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0052] Figure 1 A schematic diagram of a usage scenario of an open-back stick with continuously adjustable headrest height;

[0053] Figure 2 Schematic diagram of the structure of the open back bar with continuously adjustable headrest height Figure 1 ;

[0054] Figure 3 Schematic diagram of the structure of the open back bar with continuously adjustable headrest height Figure 2 ;

[0055] Figure 4 Schematic diagram of the structure of the open back bar with continuously adjustable headrest height Figure 3 ;

[0056] Figure 5 Schematic diagram of the structure of the open back bar with continuously adjustable headrest height Figure 4 ;

[0057] Figure 6 A partial exploded view of the backrest with continuously adjustable headrest height;

[0058] Figure 7 Schematic diagram of the structure of the fixing sleeve of the open back stick with continuously adjustable headrest height Figure 1 ;

[0059] Figure 8 Schematic diagram of the structure of the fixing sleeve of the open back stick with continuously adjustable headrest height Figure 2 ;

[0060] Fig. 9 Schematic diagram of the structure of the screw sleeve of the back-opening rod with continuously adjustable headrest height Figure 1 ;

[0061] Fig.10 Schematic diagram of the structure of the screw sleeve of the back-opening rod with continuously adjustable headrest height Figure 2 ;

[0062] Description of reference numerals:

[0063] An open-back stick 100 with continuously adjustable headrest height, a first stick 101, a second stick 102, a screwing assembly 103, a telescopic rod 10, a height indication mark 11, a second limiting step 12, a rotating head 13, a central through hole 14, a rotating shaft 15, a circular track 16, a ball groove 17, a ball 18, a headrest 20, a pressure column 21, a spring 22, a fixing sleeve 30, a hollow inner cavity 31, an elastic tongue piece 32, a first tongue portion 32a, a second tongue portion 32b, a third tongue portion 32c, a window 33, a first end d1, a second end d2, a first limiting groove 34, a second limiting groove 35, a first positioning end face 36, a second positioning end face 37, an upper sleeve portion 30a, a lower sleeve portion 30b, a screwing sleeve 40, a locking protrusion 41, a positioning block 42, a first plane f1, a second plane f2, and an anti-slip pattern 43. DETAILED DESCRIPTION

[0064] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0065] In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the utility model product is usually placed when in use, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. "First" and "second" are only for the purpose of making the description easier to understand, without any other directional meaning, and cannot be used as a limitation on the present utility model.

[0066] like Figures 1 to 5 The back-opening stick 100 with continuously adjustable headrest height provided in this embodiment includes a first stick 101 and a second stick 102. The first stick 101 and the second stick 102 can be switched between a first state parallel to each other and a second state perpendicular to each other. The specific implementation method thereof can refer to the posture corrector disclosed in the invention patent with the authorization announcement number CN114396419B.

[0067] like Figures 1 to 3 As shown, the back-opening stick 100 with a continuously adjustable headrest height further comprises a telescopic rod 10 telescopically inserted into a first stick 101, a headrest 20 rotatably mounted on the telescopic rod 10, and a screw assembly 103 for adjusting the height of the headrest 20. The headrest 20 can rotate relative to the telescopic rod 10 to adjust the height of the headrest 20. Figure 3 The vertical state parallel to the telescopic rod 10 shown in FIG. Figure 2The telescopic rod 10 is switched between the lateral states shown.

[0068] Therefore, when the first stick 101 and the second stick 102 are in the second state perpendicular to each other, the headrest 20 is rotated to be in a horizontal state perpendicular to the telescopic rod 10 and the first stick 101, and the user can Figure 1 As shown in the figure, the back-opening stick 100 with continuously adjustable headrest height is carried on the back, the back is against the first stick 101, the two arms are backward, the elbows are hooked on the second stick 102, and the back of the head or the back of the neck is against the headrest 20, so as to correct the shape of the entire back, cervical spine and head, and achieve the effect of opening the shoulders and beautifying the back.

[0069] When the first stick 101 and the second stick 102 are in the first state parallel to each other as shown in FIG*, the headrest 20 is rotated to be in a vertical state parallel to the telescopic rod 10 and the first stick 101, and the headrest 20 together with the open-back stick 100 with continuously adjustable headrest height are stored into a bundle, which is convenient to carry and saves storage space.

[0070] like Figure 4 , Figure 5 , Figures 7 to 10 As shown, the screwing assembly 103 includes a fixing sleeve 30 and a screwing sleeve 40. The fixing sleeve 30 has a hollow inner cavity 31 that runs through the top and bottom, and the first stick 101 has a hollow structure. The fixing sleeve 30 is fixed to the top of the first stick 101. The hollow inner cavity 31 of the fixing sleeve 30 and the hollow structure of the first stick 101 form a shuttle channel for the telescopic rod 10 to be telescopic. Therefore, the telescopic rod 10 is arranged in the hollow structure of the first stick 101 and the hollow inner cavity 31 of the fixing sleeve 30, and the upper end extends out for installing the headrest 20. The telescopic rod 10 is telescoped up and down in the shuttle channel to adjust the height of the headrest 20.

[0071] like Figure 5 As shown, the screw sleeve 40 is sleeved on the outside of the fixed sleeve 30 and can be circumferentially screwed relative to the fixed sleeve 30. An eccentric locking structure that cooperates with each other is provided between the screw sleeve 40 and the fixed sleeve 30. When the user screws the screw sleeve 40, the eccentric locking structure switches between locking or loosening the telescopic rod 10.

[0072] Specifically, Figures 7 to 10 As shown, the eccentric locking structure includes an elastic tongue piece 32 disposed on the peripheral side wall of the fixing sleeve 30 and a locking protrusion 41 protruding on the inner peripheral wall of the screw sleeve 40. The screw sleeve 40 is screwed so that the locking protrusion 41 abuts against the first tongue portion 32a of the elastic tongue piece 32, and the elastic tongue piece 32 squeezes the outer wall of the telescopic rod 10 to lock the telescopic rod 10. The screw sleeve 40 is screwed in the reverse direction so that the locking protrusion 41 leaves the first tongue portion 32a of the elastic tongue piece 32, and the elastic tongue piece 32 loosens the outer wall of the telescopic rod 10, so that the telescopic rod 10 can be telescoped in the shuttle channel.

[0073] It can be seen that the back-opening stick 100 with continuously adjustable headrest height provided by the utility model can lock the telescopic rod 10 at any position in its length direction by using the eccentric locking structure between the screw sleeve 40 and the fixed sleeve 30. On the basis of realizing the adjustable height of the headrest 20, the height restriction of the fixed gear is further released, thereby realizing the continuous adjustment of the height of the headrest 20, accurately meeting the needs of users with different body shapes and different abutment parts. And only need to screw the screw sleeve 40 back and forth, and use the interference fit between the locking protrusion 41, the elastic tongue 32 and the outer wall of the telescopic rod 10 to lock the height of the headrest 20, the operation is easy and simple.

[0074] like Figure 7 and Figure 8 As shown, a window 33 communicating with the hollow inner cavity 31 is provided on the peripheral side wall of the fixing sleeve 30, the first end d1 of the elastic tongue piece 32 is a free end, and the second end d2 of the elastic tongue piece 32 is connected to the side of the window 33. The elastic tongue piece 32 includes a second tongue portion 32b close to the second end d2 and a first tongue portion 32a away from the second end d2. The first tongue portion 32a away from the second end d2 means that, relative to the distance between the second tongue portion 32b and the second end d2, the first tongue portion 32a is farther from the second end d2.

[0075] It should be noted that the eccentric locking structure has at least three preferred implementations: Method 1, the locking protrusion 41 is eccentrically arranged on the inner peripheral wall of the screw sleeve 40; Method 2, the thickness of the first tongue portion 32a is greater than the thickness of the second tongue portion 32b; Method 3, Method 1 is combined with Method 2. This embodiment is preferably implemented by using Method 2, which has relatively low requirements on the component manufacturing process.

[0076] Dynamically, when the locking protrusion 41 is located at the second tongue portion 32b near the second end d2, the elastic tongue piece 32 loosens the outer wall of the telescopic rod 10, and the telescopic rod 10 can be extended and retracted in the shuttle channel. When the screw sleeve 40 is screwed, the locking protrusion 41 gradually approaches the first end d1. Since the thickness of the first tongue portion 32a is greater than the thickness of the second tongue portion 32b, the first end d1 is a free end, and the elastic tongue piece 32 is elastic, the locking protrusion 41 squeezes the elastic tongue piece 32 to cause elastic deformation with the tendency that the first end d1 presses the outer wall of the telescopic rod 10.

[0077] When the locking protrusion 41 abuts against the first tongue portion 32a of the elastic tongue piece 32, the elastic tongue piece 32 squeezes the outer wall of the telescopic rod 10 to the extent of locking the telescopic rod 10, thereby locking the outer wall of the telescopic rod 10. The screwing sleeve 40 is screwed in the reverse direction, so that the locking protrusion 41 leaves the first tongue portion 32a and returns to the second tongue portion 32b, and the elastic tongue piece 32 returns to its original state, thereby loosening the outer wall of the telescopic rod 10. In addition, the extension direction of the locking protrusion 41 is consistent with the width direction of the elastic tongue piece 32, so as to increase the contact area with the elastic tongue piece 32 and achieve a better locking effect.

[0078] like Figure 5 , Figure 7 and Figure 8 As shown, the elastic tongue piece 32 further includes a third tongue portion 32c near the first end d1. The side of the window 33 protrudes outward from the second end d2 of the elastic tongue piece 32 to form a second limiting groove 35, and the third tongue portion 32c protrudes outward from the first tongue portion 32a to form a first limiting groove 34. The screwing sleeve 40 is screwed so that the locking protrusion 41 abuts against the first tongue portion 32a of the elastic tongue piece 32, and the first limiting groove 34 limits the locking protrusion 41 from separating from the elastic tongue piece 32. The screwing sleeve 40 is screwed in the reverse direction so that the locking protrusion 41 leaves the first tongue portion 32a of the elastic tongue piece 32, and the second limiting groove 35 limits the locking protrusion 41 in the window 33.

[0079] like Figures 7 to 10 As shown, a portion of the top of the fixing sleeve 30 extends upward to form a first positioning end face 36 and a second positioning end face 37 at both ends thereof, and a positioning block 42 is convexly provided at the top of the inner peripheral wall of the screwing sleeve 40. The screwing sleeve 40 is screwed so that the locking protrusion 41 abuts against the first tongue portion 32a of the elastic tongue piece 32, and the positioning block 42 abuts against the first positioning end face 36. The screwing sleeve 40 is screwed in the reverse direction so that the locking protrusion 41 leaves the first tongue portion 32a of the elastic tongue piece 32, and the positioning block 42 abuts against the second positioning end face 37. Thus, the first positioning end face 36, the second positioning end face 37 cooperate with the positioning block 42 to limit the screwing of the screwing sleeve 40 within a certain angle range, on the one hand, to prevent the elastic tongue piece 32 from being squeezed and damaged due to excessive screwing, and on the other hand, to play a positioning role in the screwing action of the user, making the operation more convenient and worry-free.

[0080] like Figure 5 and Figure 8 As shown, the side wall of the telescopic rod 10 is provided with a first plane f1 along the telescopic direction, and the inner circumferential wall of the fixing sleeve 30 is provided with a second plane f2 that matches the first plane f1. The first plane f1 and the second plane f2 cooperate to limit the circumferential direction of the telescopic rod 10 to prevent the circumferential rotation of the telescopic rod 10 during telescopic movement, thereby causing an angular deviation of the headrest 20.

[0081] The first plane f1 is provided with a plurality of height indication marks 11 to indicate the extended length of the telescopic rod 10, so that the user can quickly find the height position that he is used to. The outer peripheral wall of the screw sleeve 40 is provided with a plurality of anti-skid lines 43 to prevent the user from slipping when screwing.

[0082] like Figure 6 and Figure 7 As shown, the fixing sleeve 30 includes an upper sleeve portion 30a and a lower sleeve portion 30b, and the lower sleeve portion 30b is used to fix with the top end of the first stick 101. The inner diameter of the lower sleeve portion 30b is larger than the inner diameter of the upper sleeve portion 30a, so as to form a first limiting step (not shown in the figure) on the peripheral side wall of the hollow inner cavity 31. The bottom end of the telescopic rod 10 is convexly provided with a second limiting step 12, and the second limiting step 12 abuts against the first limiting step to limit the bottom end of the telescopic rod 10 in the shuttle channel, so as to prevent the telescopic rod 10 from being over-stretched and detached from the first stick 101.

[0083] like Figure 6 As shown, a rotating head 13 is provided at the top of the telescopic rod 10, and a central through hole 14 is provided in the rotating head 13, and a rotating shaft 15 passes through the central through hole 14 to connect with the headrest 20. When the headrest 20 rotates relative to the rotating head 13, the rotating shaft 15 rotates in the central through hole 14. An annular track 16 is provided on the outer periphery of the central through hole 14, and four ball grooves 17 are concavely provided in four directions of the annular track 16. Two pressing columns 21 are provided on the back side of the headrest 20, and a spring 22 is placed in the pressing column 21. A ball 18 is held between each pressing column 21 and the rotating head 13.

[0084] When the headrest 20 rotates relative to the rotating head 13, the balls 18 roll in the circular track 16, and the two balls 18 enter the two opposite ball grooves 17 respectively, so as to lock the headrest 20 in the vertical state or the horizontal state. The spring 22 elastically acts on the balls 18 to make the balls 18 enter and exit the ball grooves 17, that is, the spring 22 is almost always compressed and maintains the elastic pressure on the balls 18. When the balls 18 enter the ball grooves 17, the spring 22 slightly extends to press the balls 22, so as to prevent the balls 22 from easily leaving the ball grooves 17. When the headrest 20 is rotated, the spring 22 is slightly compressed to make the balls 18 leave the ball grooves 17 and enter the circular track 16.

[0085] It can be seen that during the rotation of the headrest 20 relative to the rotating head 13, the ball 18 rolls on the annular track 16 to reduce friction and make the rotation process smoother. The annular track 16 guides the rolling of the ball 18. The ball 18 enters the ball groove 17 to lock the relative position of the headrest 20. The entire rotation and locking process is easy and quick.

[0086] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0087] The above is an introduction to the back-opening rod with continuously adjustable headrest height provided by the utility model. The principle and implementation method of the utility model are described in this article using specific examples. The description of the above embodiments is only used to help understand the utility model and its core idea. It should be pointed out that for ordinary technicians in this technical field, the utility model can also be improved and modified without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An open-back stick with continuously adjustable headrest height, comprising a first stick and a second stick, wherein the first stick and the second stick can be switched between a first state parallel to each other and a second state perpendicular to each other; characterized in that: The device also includes a telescopic rod telescopically inserted into the first stick, a headrest rotatably mounted on the telescopic rod, and a screw assembly for adjusting the height of the headrest; the headrest can rotate relative to the telescopic rod to switch between a vertical state parallel to the telescopic rod and a horizontal state perpendicular to the telescopic rod; The screwing assembly includes a fixing sleeve and a screwing sleeve; the fixing sleeve has a hollow inner cavity running through from top to bottom, the first stick has a hollow structure, the fixing sleeve is fixed to the top of the first stick, and the hollow inner cavity of the fixing sleeve and the hollow structure of the first stick form a shuttle channel for the telescopic rod to extend and retract; The screw sleeve is arranged outside the fixing sleeve and can be screwed circumferentially relative to the fixing sleeve; a mutually cooperating eccentric locking structure is arranged between the screw sleeve and the fixing sleeve, and the eccentric locking structure switches between locking or loosening the telescopic rod by screwing the screw sleeve; The eccentric locking structure includes an elastic tongue piece arranged on the peripheral side wall of the fixing sleeve and a locking protrusion protruding on the inner peripheral wall of the screwing sleeve; the screwing sleeve is screwed so that the locking protrusion abuts against the first tongue portion of the elastic tongue piece, and the elastic tongue piece squeezes the outer wall of the telescopic rod to lock the telescopic rod; the screwing sleeve is screwed in the reverse direction so that the locking protrusion leaves the first tongue portion of the elastic tongue piece, and the elastic tongue piece loosens the outer wall of the telescopic rod, so that the telescopic rod can be telescoped in the shuttle channel.

2. The back-opening stick with continuously adjustable headrest height according to claim 1, characterized in that: A window communicating with the hollow inner cavity is provided on the peripheral side wall of the fixing sleeve, the first end of the elastic tongue piece is a free end, and the second end of the elastic tongue piece is connected to the side of the window; The elastic tongue piece includes a second tongue portion close to the second end and the first tongue portion far away from the second end, and the thickness of the first tongue portion is greater than the thickness of the second tongue portion; the locking protrusion leaves the first tongue portion and comes to the second tongue portion, and the elastic tongue piece loosens the outer wall of the telescopic rod; The extending direction of the locking protrusion is consistent with the width direction of the elastic tongue.

3. The back-opening stick with continuously adjustable headrest height according to claim 2, characterized in that: The elastic tongue also includes a third tongue portion adjacent to the first end; The side edge of the window protrudes outward from the second end of the elastic tongue piece to form a second limiting groove; the third tongue portion protrudes outward from the first tongue portion to form a first limiting groove; The screwing sleeve is screwed so that the locking protrusion abuts against the first tongue portion of the elastic tongue piece, and the first limiting groove is used to limit the locking protrusion from separating from the elastic tongue piece; the screwing sleeve is screwed in the opposite direction so that the locking protrusion leaves the first tongue portion of the elastic tongue piece, and the second limiting groove is used to limit the locking protrusion within the window.

4. The back-opening stick with continuously adjustable headrest height according to claim 1, characterized in that: A portion of the top end of the fixing sleeve extends upward to form a first positioning end face and a second positioning end face at both ends thereof; a positioning block is protrudingly provided at the top end of the inner peripheral wall of the screwing sleeve; The screwing sleeve is screwed so that the locking protrusion abuts against the first tongue portion of the elastic tongue piece, and the positioning block abuts against the first positioning end surface; the screwing sleeve is screwed in the reverse direction so that the locking protrusion leaves the first tongue portion of the elastic tongue piece, and the positioning block abuts against the second positioning end surface.

5. The back-opening stick with continuously adjustable headrest height according to claim 1, characterized in that: The side wall of the telescopic rod is provided with a first plane along the telescopic direction, and the inner peripheral wall of the fixed sleeve is provided with a second plane matching with the first plane; the first plane and the second plane match to limit the circumference of the telescopic rod; A plurality of height indication marks are arranged on the first plane; and a plurality of anti-slip grooves are arranged on the outer peripheral wall of the screw sleeve.

6. The back-opening stick with continuously adjustable headrest height according to claim 1, characterized in that: The fixing sleeve comprises an upper sleeve portion and a lower sleeve portion, wherein the lower sleeve portion is used to be fixed to the top end of the first stick; The inner diameter of the lower sleeve portion is greater than the inner diameter of the upper sleeve portion, so as to form a first limiting step on the peripheral side wall of the hollow inner cavity; A second limiting step is protruding from the bottom end of the telescopic rod, and the second limiting step abuts against the first limiting step to limit the bottom end of the telescopic rod within the shuttle channel.

7. The back-opening stick with continuously adjustable headrest height according to claim 1, characterized in that: A rotating head is provided at the top of the telescopic rod, and a central through hole is opened on the rotating head, and a rotating shaft passes through the central through hole to connect with the headrest, and when the headrest rotates relative to the rotating head, the rotating shaft rotates in the central through hole; An annular track is provided on the outer periphery of the central through hole, and four ball grooves are concavely provided on the four directions of the annular track; two pressing columns are provided on the back side of the headrest, and springs are placed in the pressing columns, and a ball is held between each pressing column and the rotating head; When the headrest rotates relative to the rotating head, the balls roll in the annular track; the two balls enter the two opposite ball grooves respectively to lock the headrest in a vertical state or a horizontal state; the spring elastically acts on the balls to make the balls enter and exit the ball grooves.

8. An open-back stick with continuously adjustable headrest height, comprising a first stick and a second stick, wherein the first stick and the second stick can be switched between a first state parallel to each other and a second state perpendicular to each other; characterized in that: The device also includes a telescopic rod telescopically inserted into the first stick, a headrest rotatably mounted on the telescopic rod, and a screw assembly for adjusting the height of the headrest; the headrest can rotate relative to the telescopic rod to switch between a vertical state parallel to the telescopic rod and a horizontal state perpendicular to the telescopic rod; The screwing assembly includes a fixing sleeve and a screwing sleeve; the fixing sleeve has a hollow inner cavity running through from top to bottom, the first stick has a hollow structure, the fixing sleeve is fixed to the top of the first stick, and the hollow inner cavity of the fixing sleeve and the hollow structure of the first stick form a shuttle channel for the telescopic rod to extend and retract; The screw sleeve is arranged outside the fixing sleeve and can be screwed circumferentially relative to the fixing sleeve; a mutually cooperating eccentric locking structure is arranged between the screw sleeve and the fixing sleeve, and the eccentric locking structure switches between locking or loosening the telescopic rod by screwing the screw sleeve; The eccentric locking structure comprises an elastic tongue piece arranged on the peripheral side wall of the fixing sleeve and a locking protrusion convexly arranged on the inner peripheral wall of the screwing sleeve; A window communicating with the hollow inner cavity is provided on the peripheral side wall of the fixing sleeve, the first end of the elastic tongue piece is a free end, and the second end of the elastic tongue piece is connected to the side of the window; The elastic tongue piece comprises a second tongue portion close to the second end and a first tongue portion far from the second end, and the thickness of the first tongue portion is greater than the thickness of the second tongue portion; The screwing sleeve is screwed so that the locking protrusion abuts against the first tongue portion of the elastic tongue piece, and the elastic tongue piece squeezes the outer wall of the telescopic rod to lock the telescopic rod; the screwing sleeve is screwed in the opposite direction so that the locking protrusion leaves the first tongue portion of the elastic tongue piece and comes to the second tongue portion, and the elastic tongue piece loosens the outer wall of the telescopic rod, and the telescopic rod can be telescoped in the shuttle channel.

9. The back-opening stick with continuously adjustable headrest height according to claim 8, characterized in that: The elastic tongue also includes a third tongue portion adjacent to the first end; The side edge of the window protrudes outward from the second end of the elastic tongue piece to form a second limiting groove; the third tongue portion protrudes outward from the first tongue portion to form a first limiting groove; The screwing sleeve is screwed so that the locking protrusion abuts against the first tongue portion of the elastic tongue piece, and the first limiting groove is used to limit the locking protrusion from separating from the elastic tongue piece; the screwing sleeve is screwed in the opposite direction so that the locking protrusion leaves the first tongue portion of the elastic tongue piece, and the second limiting groove is used to limit the locking protrusion within the window.

10. The back-opening stick with continuously adjustable headrest height according to claim 8, characterized in that: A portion of the top end of the fixing sleeve extends upward to form a first positioning end face and a second positioning end face at both ends thereof; a positioning block is protrudingly provided at the top end of the inner peripheral wall of the screwing sleeve; The screwing sleeve is screwed so that the locking protrusion abuts against the first tongue portion of the elastic tongue piece, and the positioning block abuts against the first positioning end surface; the screwing sleeve is screwed in the reverse direction so that the locking protrusion leaves the first tongue portion of the elastic tongue piece, and the positioning block abuts against the second positioning end surface.

11. The back-opening stick with continuously adjustable headrest height according to claim 8, characterized in that: The side wall of the telescopic rod is provided with a first plane along the telescopic direction, and the inner peripheral wall of the fixed sleeve is provided with a second plane matching with the first plane; the first plane and the second plane match to limit the circumference of the telescopic rod; A plurality of height indication marks are arranged on the first plane; and a plurality of anti-slip grooves are arranged on the outer peripheral wall of the screw sleeve.

12. The back-opening stick with continuously adjustable headrest height according to claim 8, characterized in that: The fixing sleeve comprises an upper sleeve portion and a lower sleeve portion, wherein the lower sleeve portion is used to be fixed to the top end of the first stick; The inner diameter of the lower sleeve portion is greater than the inner diameter of the upper sleeve portion, so as to form a first limiting step on the peripheral side wall of the hollow inner cavity; A second limiting step is protruding from the bottom end of the telescopic rod, and the second limiting step abuts against the first limiting step to limit the bottom end of the telescopic rod within the shuttle channel.

13. The back-opening stick with continuously adjustable headrest height according to claim 8, characterized in that: A rotating head is provided at the top of the telescopic rod, and a central through hole is opened on the rotating head, and a rotating shaft passes through the central through hole to connect with the headrest, and when the headrest rotates relative to the rotating head, the rotating shaft rotates in the central through hole; An annular track is provided on the outer periphery of the central through hole, and four ball grooves are concavely provided on the four directions of the annular track; two pressing columns are provided on the back side of the headrest, and springs are placed in the pressing columns, and a ball is held between each pressing column and the rotating head; When the headrest rotates relative to the rotating head, the balls roll in the annular track; the two balls enter the two opposite ball grooves respectively to lock the headrest in a vertical state or a horizontal state; the spring elastically acts on the balls to make the balls enter and exit the ball grooves.

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