Sofa headrest hinge

Abstract

The sofa headrest hinge comprises a connecting seat, a fixed shaft and a connecting rod, two movable pieces which are rotatably installed on the fixed shaft are fixed to one end of the connecting base, the two movable pieces are sleeved with a first protective cover and a second protective cover respectively, an installation inserting hole is formed in the first protective cover, and an installation inserting part which is inserted into the installation inserting hole in a matched mode is arranged on the second protective cover. And the first protecting cover and the second protecting cover are inserted into the mounting insertion holes based on the mounting insertion parts so as to be fixed on the movable sheet. The first protective cover and the second protective cover are arranged to effectively cover the complex structure in the hinge, the overall attractiveness of the product is improved, meanwhile, foreign matter is prevented from entering the hinge to cause part damage or function failure, and the practicability and durability of the product are enhanced; and the first protecting cover and the second protecting cover are fixed on the movable sheet through the insertion matching of the mounting insertion holes and the mounting insertion parts, so that the mounting is more stable and does not shake, and the mounting quality of the first protecting cover and the second protecting cover is effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of hinges, in particular to a sofa headrest hinge. Background Art

[0002] The sofa headrest hinge is a device used to connect the sofa backrest and the sofa headrest.

[0003] Referring to the fine-tooth hinge disclosed in the technical scheme of patent No. 202021024450.1, in this technical scheme, the rotating gear is fixedly connected to the insertion rod, and a rotatable first side plate and a second side plate are provided on both sides of the rotating gear, and the first side plate and the second side plate are respectively provided with a first mounting hole and a second mounting hole corresponding to each other, and the gear tooth block is passed through the first mounting hole and the second mounting hole, and the first fine beveled tooth at the upper end of the gear tooth block is engaged with the second fine beveled tooth of the rotating gear; the first mounting hole and the second mounting hole are also respectively inserted with a first elastic sheet and a second elastic sheet, and the first elastic sheet and the second elastic sheet respectively abut against the two sides of the lower end face of the gear tooth block; the first cover plate and the second cover plate are respectively provided on the outer sides of the first side plate and the second side plate, and the first cover plate and the second cover plate also cover the first mounting hole and the second mounting hole respectively. This technical solution uses the shifting tooth block and the spring piece to form an angle locking mechanism that cooperates with the rotating gear to lock the angle of the side panel. At the same time, the first cover plate and the second cover plate are used to cover the first mounting hole and the second mounting hole respectively. This not only ensures the aesthetics of the product structure, but also prevents foreign matter from entering and affecting the operation of the angle locking mechanism, thereby ensuring product quality.

[0004] However, while this technical solution has achieved significant improvements in functionality and aesthetics, it still has some shortcomings. For example, the first and second cover plates are fixed together using rivets. While this fixing method is simple and effective, the rivets are exposed on the outside of the hinge, which not only affects the overall aesthetics of the product, but also because the rivet fixing method is non-removable, it is difficult to remove and repair the first and second cover plates if the angle locking mechanism malfunctions or requires maintenance, which undoubtedly increases the difficulty and cost of subsequent maintenance. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a sofa headrest hinge.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A sofa headrest hinge comprises a connecting seat, a fixed shaft and a connecting rod; two movable pieces rotatably mounted on the fixed shaft are fixed to one end of the connecting seat; a toothed disc body is provided on the fixed shaft and located between the two movable pieces; an angle locking structure is provided between the two movable pieces and is used to cooperate with the toothed disc body to limit the rotation angle of the movable pieces; the hinge is characterized in that a first protective cover and a second protective cover are respectively provided on the outside of the two movable pieces, the outer sides of the first protective cover and the second protective cover are each provided with an avoidance through-hole corresponding to the fixed shaft, and the inner sides of the first protective cover and the second protective cover are each provided with an accommodating groove connected to the avoidance through-hole and used to accommodate the movable piece; the connecting rod is provided with a mating shaft, which passes through the avoidance through-hole of the first protective cover or the second protective cover and is fixedly connected to the fixed shaft by a mating bolt;

[0008] The first protective cover is provided with a mounting socket, the second protective cover is provided with a mounting plug that is inserted into the mounting socket, and the first and second protective covers are fixed to the movable sheet based on the mounting plug being inserted into the mounting socket.

[0009] In the present invention, the two movable plates are riveted to the left and right sides of the end of the connecting seat by rivets, and the two ends of the rivets are respectively surrounded by the first protective cover and the second protective cover; the inner sides of the rear ends of the first protective cover and the second protective cover are provided with positioning notches connected to the accommodating groove, and one end of the connecting seat extends between the first protective cover and the second protective cover through the positioning notch.

[0010] In the present invention, an inner positioning hole is provided on the connecting seat, and an outer positioning hole corresponding to the inner positioning hole is provided on the movable plate. The inner positioning hole and the corresponding outer positioning hole form a middle positioning hole, and the inner protrusion of the accommodating groove has an inner positioning plug shaft inserted into the middle positioning hole to cooperate with the positioning.

[0011] In the present invention, a plurality of external positioning grooves are provided on the outer periphery of the movable piece, a plurality of external positioning parts are protruded in the accommodating groove, and each external positioning part is inserted and fitted in an external positioning groove.

[0012] In the present invention, a rear positioning portion protruding forward is provided on the rear wall of the accommodating groove, and a rear end of the movable piece is provided with a rear positioning recessed position positioned and matched with the rear positioning portion.

[0013] In the present invention, the mounting sockets are provided on both the inner positioning plug shaft and the outer positioning portion of the first protective cover, and the mounting plug portions are provided on both the inner positioning plug shaft and the outer positioning portion of the second protective cover.

[0014] In the present invention, one end of the mating shaft is provided with a limit head that abuts against the outside of the end of the connecting rod, and a connecting screw hole is provided on the end face of the other end. At least part of the screw rod of the mating bolt is threadedly engaged in the connecting screw hole, and the head diameter of the mating bolt is smaller than the aperture of the avoidance through hole.

[0015] In the utility model, a first washer is mounted on the mating shaft and is located between one of the movable pieces and the connecting rod. The inner diameter of the first washer is smaller than the diameter of the avoidance through hole. One end of the first washer passes through the avoidance through hole of the first protective cover and rests on one end face of the fixed shaft, and the other end rests on one end of the connecting rod.

[0016] In the present invention, a second washer is sleeved on the screw rod of the mating bolt and is located between the other movable piece and the head of the mating bolt.

[0017] In the present invention, the second gasket includes a positioning ring and an inner gasket ring connected in sequence along the axial direction.

[0018] The positioning ring is located in the avoidance hole of the second protective cover, one end of the positioning ring abuts against the head of the mating bolt, and the other end abuts against the other end face of the fixed shaft, and the end of the inner gasket facing away from the positioning ring abuts against the movable piece, and the screw of the mating bolt passes through the inner ring of the positioning ring and the inner gasket in turn and then is threadedly engaged in the connecting screw hole.

[0019] The beneficial effects of the present invention are as follows: the present invention provides a first protective cover and a second protective cover, which effectively covers the complex structure inside the hinge, improves the overall aesthetics of the product, and prevents foreign matter from entering to cause damage to components or functional failure, thereby enhancing the practicality and durability of the product; and the first protective cover and the second protective cover are fixed to the movable piece through the plug-in cooperation of the mounting socket and the mounting plug. This design not only simplifies the installation process, but also makes it easy to disassemble the protective cover when needed, which is convenient for inspection and maintenance of internal components such as the angle locking structure, greatly reducing the difficulty and cost of later maintenance; in addition, the first protective cover and the second protective cover are both provided with a structure that cooperates with the movable piece for positioning, so that the installation of the first protective cover and the second protective cover is more stable and does not shake, effectively ensuring the installation quality of the first protective cover and the second protective cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 A three-dimensional diagram of the hinge for the sofa headrest;

[0022] Figure 2 An exploded view of the sofa headrest hinge;

[0023] Figure 3 is a structural diagram of the second protective cover and the movable piece;

[0024] Figure 4 This is the left side view of the sofa headrest hinge;

[0025] Figure 5 for Figure 4 Cross-sectional view of AA;

[0026] Figure 6 This is a schematic diagram of a sofa headrest hinge with only a connecting circular hole. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, if there are descriptions involving "first" or "second" in the embodiments of the present invention, the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] Reference Figure 1-5 , a sofa headrest hinge, comprising a connecting seat 1, a fixed shaft 2 and a connecting rod 3; one end of the connecting seat 1 is fixed with two movable pieces 4 rotatably mounted on the fixed shaft 2. Specifically, the movable piece 4 is provided with a rotating hole so that the movable piece 4 can rotate around the fixed shaft 2. The left and right ends of the fixed shaft 2 respectively pass through the rotating holes of the two movable pieces 4, so as to achieve the purpose of rotatably mounting the movable piece 4 on the fixed shaft 2; the fixed shaft 2 is provided with a toothed disc body 21 located between the two movable pieces 4, and an angle locking structure for cooperating with the toothed disc body 21 to limit the rotation angle of the movable piece 4 is provided between the two movable pieces 4. The angle locking structure includes a gear tooth block 5 and a spring piece that drives the gear tooth block 5 to engage with the toothed disc body 21. The cooperation between the angle locking structure and the toothed disc body 21 to lock the angle of the movable piece 4 is an existing conventional technology, so it will not be described in detail.

[0031] Furthermore, the two movable pieces 4 are respectively fitted with a first protective cover 6 and a second protective cover 7, which are respectively fitted over the two movable pieces 4, effectively improving the aesthetics of the sofa headrest hinge. The outer sides of the first and second protective covers 6 and 7 are each provided with a clearance hole 671 corresponding to the fixed shaft 2, and the inner sides of the first and second protective covers are each provided with a receiving groove 672 that communicates with the clearance hole 671 and is used to accommodate the movable piece 4. The connecting rod 3 is provided with a mating shaft 8, which passes through the clearance hole 671 of the first protective cover 6 and is fixedly connected to the fixed shaft 2 using a mating bolt 10. This secures the connecting rod 3 to the fixed shaft 2, ensuring that the fixed shaft 2 is non-rotatably mounted on the connecting rod 3. In other embodiments, the mating shaft 8 passes through the clearance hole 671 of the second protective cover 7 and is fixedly connected to the fixed shaft 2.

[0032] Furthermore, the first protective cover 6 is provided with a mounting socket 61, and the second protective cover 7 is provided with a mounting plug 71 that is inserted into the mounting socket 61. The first protective cover 6 and the second protective cover 7 are fixed to the movable sheet 4 based on the mounting plug 71 being inserted into the mounting socket 61, so that when the mounting plug 71 is disengaged from the mounting socket 61, the first protective cover 6 and the second protective cover 7 can be separated from the movable sheet 4.

[0033] In this embodiment, the axial cross-sectional shape of the mating shaft 8 is polygonal, and a first adapting hole 31 is provided on one end of the connecting rod 3 for circumferential positioning cooperation with the mating shaft 8. The axial direction of the fixed shaft 2 is provided with a second adapting hole 22 for circumferential positioning cooperation with the mating shaft 8, and the other end of the mating shaft 8 is inserted and cooperated in the first adapting hole 31 and the second adapting hole 22 in sequence.

[0034] In this embodiment, the two movable pieces 4 are riveted to the left and right ends of the connecting base 1 using rivets 9. The ends of the rivets 9 are respectively enclosed by the first and second protective covers 6 and 7, thereby ensuring the aesthetics of the sofa headrest hinge. In addition, the rear ends of the first and second protective covers 6 and 7 are each provided with a positioning notch 670 connected to the receiving groove 672. One end of the connecting base 1 extends through the positioning notch 670 between the first and second protective covers 6 and 7, thereby concealing the end of the connecting base 1 within the first and second protective covers 6 and 7.

[0035] In this embodiment, an inner positioning hole is provided on the connecting seat 1, and an outer positioning hole 41 corresponding to the inner positioning hole is provided on the movable piece 4. The inner positioning hole and the corresponding outer positioning hole 41 form a middle positioning hole. The inner protrusion of the accommodating groove 672 has an inner positioning plug shaft 673 inserted into the middle positioning hole to cooperate with the positioning, so that the first protective cover 6 and the second protective cover 7 are better positioned on the corresponding movable piece 4.

[0036] In this embodiment, the outer periphery of the movable piece 4 is provided with a plurality of external positioning grooves 42. The receiving groove 672 is provided with a plurality of external positioning portions 674 protruding therein. Each external positioning portion 674 is inserted and fitted into one of the external positioning grooves 42. The rear wall of the receiving groove 672 is provided with a rear positioning portion 675 protruding forward. The rear end of the movable piece 4 is provided with a rear positioning recess 43 that is positioned and fitted with the rear positioning portion 675. This further improves the positioning quality of the first protective cover 6 and the second protective cover 7 on the movable piece 4. Furthermore, at least one of the external positioning grooves 42 is provided in the middle of the top end of the movable piece 4, and at least one of the external positioning grooves 42 is provided in the middle of the bottom end of the movable piece 4. The external positioning hole 41 is provided near the rear end of the movable piece 4. This rationally distributes the external positioning grooves 42 and the external positioning hole 41, so that the top, bottom, and rear ends of the first protective cover 6 and the second protective cover 7 are all positioned, improving their assembly quality on the movable piece 4.

[0037] In this embodiment, the mounting socket 61 is provided on the inner positioning plug shaft 673 and the outer positioning portion 674 of the first protective cover 6, and the mounting plug portion 71 is provided on the inner positioning plug shaft 673 and the outer positioning portion 674 of the second protective cover 7. In this way, the reasonable arrangement of the inner positioning plug shaft 673 and the outer positioning portion 674 is utilized to better combine the first protective cover 6 and the second protective cover 7 together.

[0038] In this embodiment, one end of the mating shaft 8 is provided with a stopper 81 that abuts against the outer side of the end of the connecting rod 3, and the end surface of the other end is provided with a connecting screw hole 82. At least a portion of the screw rod of the mating bolt 10 is threadedly engaged with the connecting screw hole 82. Furthermore, the head diameter of the mating bolt 10 is smaller than the aperture of the avoidance through hole 671. This allows the mating bolt 10 to be mounted on the mating shaft 8. As a result, the second protective cover 7 is not constrained by the head of the mating bolt 10. When the mounting socket 71 is disengaged from the mounting socket 61, the second protective cover 7 can be directly removed from the movable plate 4.

[0039] In this embodiment, a first washer 11 is mounted on the mating shaft 8 and is located between one of the movable pieces 4 and the connecting rod 3. The first washer 11 is non-rotatably mounted on the mating shaft 8. Specifically, the middle part of the first washer 11 is a polygonal hole of the washer that matches the cross-section of the mating shaft 8, so that the first washer 11 can be fixed by the mating shaft 8; the first washer 11 is located in the avoidance hole 671 of the first protective cover 6, and the inner diameter of the first washer 11 is smaller than the diameter of the avoidance hole 671. One end of the first washer 11 passes through the avoidance hole 671 of the first protective cover 6 and rests on one end face of the fixed shaft 2, and the other end rests on one end of the connecting rod 3, so as to prevent the connecting rod 3 from directly pressing on the first protective cover 6 to cause damage after the mating bolt 10 is tightened, thereby avoiding affecting the normal movement of the movable piece 4.

[0040] In this embodiment, a second washer 12 is mounted on the screw of the mating bolt 10, positioned between the other movable piece 4 and the head of the mating bolt 10. The second washer 12 includes a positioning ring 121 and an inner washer 122, which are sequentially connected along the axial direction. The positioning ring 121 is positioned in the avoidance hole 671 of the second protective cover 7. The inner diameter of the positioning ring 121 is smaller than the diameter of the avoidance hole 671. One end of the positioning ring 121 abuts the head of the mating bolt 10, and the other end abuts the other end face of the fixed shaft 2. The end of the inner washer 122 facing away from the positioning ring 121 abuts the movable piece 4. The screw of the mating bolt 10 passes through the inner rings of the positioning ring 121 and the inner washer 122 in sequence, and then is threadedly engaged with the connecting screw hole 82. The second washer 12 is used to cooperate with the mating bolt 10 to limit the mating shaft 8.

[0041] In this embodiment, the connecting seat 1 is provided with a connecting plate 101 for connecting the headrest, and the connecting plate 101 is provided with at least one connecting circular hole and a connecting oblong hole, and the connecting circular hole and the connecting oblong hole are used to cooperate with bolts to fix the headrest. In other embodiments, the connecting plate 101 may also be provided with only connecting circular holes, such as Figure 6 shown.

[0042] In this embodiment, the other end of the connecting rod 3 is provided with an insertion rod portion 32 connected thereto in an L-shape, and the insertion rod portion 32 is provided with a threaded insertion portion 33, and the threaded insertion portion 33 is threadedly sleeved with an insertion rod nut and an insertion rod washer for fixing, so as to fix the insertion rod portion 32 on the sofa.

[0043] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the scope of protection of the present invention.

Claims

1. A sofa headrest hinge, comprising a connecting seat (1), a fixed shaft (2) and a connecting rod (3); two movable pieces (4) rotatably mounted on the fixed shaft (2) are fixed to one end of the connecting seat (1); a toothed disc body (21) located between the two movable pieces (4) is provided on the fixed shaft (2); an angle locking structure for cooperating with the toothed disc body (21) to limit the rotation angle of the movable piece (4) is provided between the two movable pieces (4); and the characteristics are: The two movable pieces (4) are respectively covered with a first protective cover (6) and a second protective cover (7). The outer sides of the first protective cover (6) and the second protective cover (7) are both provided with a bypass hole (671) corresponding to the fixed shaft (2), and the inner sides of the first protective cover (6) and the second protective cover (7) are both provided with a receiving groove (672) connected with the bypass hole (671) and used to receive the movable piece (4). The connecting rod (3) is provided with a matching shaft (8). The matching shaft (8) passes through the bypass hole (671) of the first protective cover (6) or the second protective cover (7) and is fixedly connected to the fixed shaft (2) by a matching bolt (10). The first protective cover (6) is provided with a mounting socket (61), and the second protective cover (7) is provided with a mounting plug (71) inserted into the mounting socket (61). The first protective cover (6) and the second protective cover (7) are fixed to the movable sheet (4) based on the mounting plug (71) being inserted into the mounting socket (61).

2. The sofa headrest hinge according to claim 1, characterized in that: The two movable pieces (4) are riveted to the left and right sides of the end of the connecting seat (1) by rivets (9), and the two ends of the rivet (9) are respectively surrounded by the first protective cover (6) and the second protective cover (7); the inner sides of the rear ends of the first protective cover (6) and the second protective cover (7) are provided with a positioning notch (670) connected to the accommodating groove (672), and one end of the connecting seat (1) extends between the first protective cover (6) and the second protective cover (7) through the positioning notch (670).

3. The sofa headrest hinge according to claim 1, characterized in that: The connecting seat (1) is provided with an inner positioning hole, and the movable plate (4) is provided with an outer positioning hole (41) corresponding to the inner positioning hole. The inner positioning hole and the outer positioning hole (41) corresponding thereto form a middle positioning hole. The inner protrusion of the accommodating groove (672) has an inner positioning plug shaft (673) inserted into the middle positioning hole for matching positioning.

4. The sofa headrest hinge according to claim 3, characterized in that: A plurality of external positioning grooves (42) are provided on the outer periphery of the movable piece (4), a plurality of external positioning portions (674) are protruded in the accommodating groove (672), and each external positioning portion (674) is inserted and fitted in an external positioning groove (42).

5. The sofa headrest hinge according to claim 4, characterized in that: A rear positioning portion (675) protruding forward is provided on the rear wall of the accommodating groove (672), and a rear end of the movable piece (4) is provided with a rear positioning recess (43) that is positioned and matched with the rear positioning portion (675).

6. The sofa headrest hinge according to claim 4, characterized in that: The mounting socket (61) is provided on both the inner positioning plug shaft (673) and the outer positioning portion (674) of the first protective cover (6), and the mounting plug portion (71) is provided on both the inner positioning plug shaft (673) and the outer positioning portion (674) of the second protective cover (7).

7. The sofa headrest hinge according to claim 1, characterized in that: One end of the mating shaft (8) is provided with a limit head (81) that abuts against the outer side of the end of the connecting rod (3), and the end surface of the other end is provided with a connecting screw hole (82), and at least a portion of the screw rod of the mating bolt (10) is threadedly engaged in the connecting screw hole (82), and the head diameter of the mating bolt (10) is smaller than the aperture of the avoidance through hole (671).

8. The sofa headrest hinge according to claim 1, characterized in that: The mating shaft (8) is provided with a first washer (11) between one of the movable pieces (4) and the connecting rod (3). The inner diameter of the first washer (11) is smaller than the diameter of the avoidance through hole (671). One end of the first washer (11) passes through the avoidance through hole (671) of the first protective cover (6) and abuts against one end surface of the fixed shaft (2), while the other end abuts against one end of the connecting rod (3).

9. The sofa headrest hinge according to claim 1, characterized in that: The screw rod of the matching bolt (10) is sleeved with a second washer (12) located between the other movable piece (4) and the head of the matching bolt (10).

10. The sofa headrest hinge according to claim 9, characterized in that: The second gasket (12) comprises a positioning ring (121) and an inner gasket ring (122) connected in sequence along the axial direction. The positioning ring (121) is located in the avoidance through hole (671) of the second protective cover (7), one end of the positioning ring (121) abuts against the head of the matching bolt (10), and the other end abuts against the other end surface of the fixed shaft (2), and the end of the inner washer (122) facing away from the positioning ring (121) abuts against the movable plate (4), and the screw of the matching bolt (10) passes through the inner rings of the positioning ring (121) and the inner washer (122) in sequence and then is threadedly engaged in the connecting screw hole (82).

Images