Automobile seat backrest lock

Abstract

The utility model provides an automobile seat backrest lock, and belongs to the technical field of automobile seats. The universal backrest lock solves the problem that in the prior art, lock blades of two backrest locks used in pairs cannot be used universally. The automobile seat backrest lock comprises a lock shell, a first rotating shaft and a second rotating shaft, the first rotating shaft and the second rotating shaft are fixedly arranged on the lock shell, the first rotating shaft is movably sleeved with a lock blade, the second rotating shaft is movably sleeved with a return spring and a limiting plate, the two ends of the return spring are connected to the lock shell and the limiting plate respectively, and a driving shaft is perpendicularly inserted into the limiting plate. A tension spring is connected between the driving shaft and the lock blade, an abutting portion protruding in the radial direction of the first rotating shaft is arranged on the peripheral face of the lock blade, an arc-shaped abutting face is arranged on the peripheral face of the limiting plate, and under the action of the return spring and the tension spring, the abutting portion of the lock blade abuts against the abutting face of the limiting plate. The universal backrest lock has the advantage that the lock blades and the limiting plates of the two backrest locks in pairs can be universal.

Description

Technical Field

[0001] This utility model belongs to the field of automotive seat technology and relates to an automotive seat back lock. Background Technology

[0002] A backrest lock is a device used in pairs to secure the back of a car seat. The two locks are positioned on opposite sides of the car seat to lock and unlock the seat back and seat cushion. For example, Chinese patent literature discloses a backrest lock (application number: 201721875665.2), comprising a lock housing and a lock cover, connected by a first rivet and a second rivet. The lock housing contains a lock leaf and a stop hook that can engage with each other. The lock leaf is fitted onto the first rivet, and the stop hook is fitted onto the second rivet. Both the lock leaf and the stop hook are equipped with torsion springs. A locking plate is also fitted onto the second rivet. The lock leaf has a boss, and one end of the locking plate abuts against the boss, while the other end has a bent portion that abuts against one side of the stop hook. The locking plate is also equipped with a return torsion spring, which is fitted onto the second rivet.

[0003] The backrest lock has the following shortcomings during use: When the backrest lock is in the locked state, the locking leaf and the stop hook are engaged, and one end of the locking plate abuts against the protrusion of the locking leaf, making the backrest lock more stable in the locked working state. Since the backrest lock is used in pairs, and the locking leaf of the backrest lock has a protrusion formed on one side, the locking leaf of the two pairs of backrest locks cannot be used interchangeably. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a car seat backrest lock. The technical problem this invention aims to solve is the incompatibility of the locking levers in existing paired backrest locks.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A car seat backrest lock includes a lock housing and a first rotating shaft and a second rotating shaft respectively fixed on the lock housing. A lock leaf is movably sleeved on the first rotating shaft, and a return spring and a limiting plate are movably sleeved on the second rotating shaft. The two ends of the return spring are respectively connected to the lock housing and the limiting plate. The limiting plate is characterized in that a drive shaft is vertically inserted into the limiting plate, and a tension spring is connected between the drive shaft and the lock leaf. The outer peripheral surface of the lock leaf has a radially protruding abutment portion along the first rotating shaft, and the outer peripheral surface of the limiting plate has an arc-shaped abutment surface. Under the action of the return spring and the tension spring, the abutment portion of the lock leaf abuts against the abutment surface of the limiting plate.

[0007] Unlike existing technologies, this car seat backrest lock eliminates the boss structure on the end face of the lock leaf, changing the staggered arrangement of the lock leaf and the limiting plate to a side-by-side arrangement. A raised abutment is added to the outer circumference of the lock leaf, and an abutment surface is added to the outer circumference of the limiting plate for the abutment to rest against. The lock leaf abuts against the abutment surface of the limiting plate, replacing the boss structure. Since the abutment and abutment surface are located on the outer circumferences of the lock leaf and the limiting plate respectively, the lock leaves and limiting plates of the two paired backrest locks can be interchanged. This reduces the variety of shapes of the internal parts of the two paired backrest locks due to symmetry requirements, thus solving the problem that the lock leaves of existing paired backrest locks cannot be interchanged.

[0008] In use, the locking leaf abuts against the abutting surface of the limiting plate. At the same time, under the action of the tension spring, the locking leaf and the limiting plate, under the action of the return spring and the tension spring, keep the locking leaf and the limiting plate in a relatively stationary state under the action of friction to achieve the locking of the backrest lock. When unlocking, it is only necessary to drive the limiting plate to rotate so that the abutting part and the abutting surface disengage. The locking leaf can then rotate and unlock under the action of the tension spring.

[0009] In addition, eliminating the boss structure on the end face of the lock leaf can further reduce the thickness space of the backrest lock, meeting the need for a smaller Y-axis arrangement space.

[0010] In the aforementioned car seat backrest lock, a insertion hole is provided on the limiting plate. The size of the insertion hole is larger than the size of the drive shaft, and the drive shaft is axially limited within the insertion hole of the limiting plate. The insertion hole's larger size allows for the absorption of installation tolerances caused by the length of the unlocking rod. Specifically, when the unlocking rod is too large, it may prematurely push the limiting plate after installation, leading to abnormal lock leaf posture. By setting the insertion hole size to be larger than the drive shaft size, within the existing lock rod tolerance range, it ensures that the unlocking rod will not prematurely push the limiting plate, improving the reliability of the backrest lock. Simultaneously, the tension spring constantly pulls the drive shaft towards the lock leaf side, and the drive shaft, driving the unlocking rod, has a tensioning tendency, ensuring that no looseness occurs when the drive shaft is in any position of the insertion hole, eliminating the risk of vibration and abnormal noise.

[0011] In the aforementioned type of car seat backrest lock, the drive shaft has an annular protrusion. An unlocking lever, a washer, and a bushing are also fitted onto the drive shaft. The washer and bushing abut against both ends of the limiting plate, and the two sides of the unlocking lever abut against the washer and the annular protrusion, respectively. The end of the drive shaft away from the annular protrusion is riveted to the limiting plate. This allows the unlocking lever to better drive the limiting plate to rotate via the drive shaft, thereby unlocking the backrest lock.

[0012] In the aforementioned car seat backrest lock, the insertion hole is an oblong hole, and the tension spring is parallel to both the lock leaf and the limiting plate. The oblong shape of the insertion hole not only facilitates its manufacturing but also allows for easier adjustment of the drive shaft's position on the limiting plate. Furthermore, the parallel arrangement of the tension spring with both the lock leaf and the limiting plate ensures that the lock leaf and the limiting plate remain relatively stationary under friction, and also allows for better unlocking by driving the lock leaf to rotate when the abutting part and the abutting surface disengage.

[0013] In the aforementioned type of car seat backrest lock, the lock leaf is further covered with a rubber sleeve, and the abutment part is exposed outside the rubber sleeve. One end of the tension spring is connected to the drive shaft, and the other end of the tension spring is connected to the rubber sleeve. The rubber sleeve serves two purposes: firstly, it prevents noise generated by the collision between the lock leaf and the bolt when the backrest lock is working; secondly, it increases the friction between the lock leaf and the limiting plate when they abut against each other.

[0014] In the aforementioned car seat backrest lock, the rubber sleeve has an anti-collision part, which is located on the edge of the rubber sleeve away from the return spring. The anti-collision part is disposed opposite to the limiting plate. This arrangement ensures that a return spring is provided between one side of the limiting plate and the lock housing, while an anti-collision part is provided between the other side of the limiting plate and the lock housing, thereby preventing direct collision between the limiting plate and the lock housing during rotation.

[0015] Compared with existing technologies, the advantages of this car seat backrest lock are as follows: Unlike existing technologies, this car seat backrest lock eliminates the boss structure located on the end face of the lock leaf and adds a raised abutment part on the outer peripheral surface of the lock leaf. It also adds an abutment surface on the outer peripheral surface of the limiting plate for the abutment part to abut against. The lock leaf abuts against the abutment surface of the limiting plate instead of the boss structure. Since the abutment part and the abutment surface are located on the outer peripheral surfaces of the lock leaf and the limiting plate, the lock leaf and the limiting plate of the two paired backrest locks can be interchanged, reducing the manufacturing and use costs of the backrest lock. Attached Figure Description

[0016] Figure 1 This is a 3D structural diagram of the car seat back lock.

[0017] Figure 2 This is an exploded view of the car seat back lock.

[0018] Figure 3 This is a front view structural diagram of the car seat back lock leaf and limit plate.

[0019] In the diagram, 1 is the lock housing; 2 is the first rotating shaft; 3 is the second rotating shaft; 4 is the lock leaf; 4a is the abutment part; 5 is the return spring; 6 is the limiting plate; 6a is the abutment surface; 6b is the insertion hole; 7 is the drive shaft; 7a is the annular protrusion; 7b is the washer; 7c is the bushing; 8 is the tension spring; 9 is the unlocking rod; 10 is the rubber sleeve; and 10a is the anti-collision part.

[0020] In the figure, drive shaft 7 is the shape after the piercing is thickened. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0022] A car seat back lock, reference Figure 1-3 The lock includes a lock housing 1 and a first rotating shaft 2 and a second rotating shaft 3 respectively fixed on the lock housing 1. The first rotating shaft 2 and the second rotating shaft 3 are both rivets riveted to the lock housing 1. A washer is also fitted on the rivet, and the washer is located between the rivet's uptake and the lock housing 1. A lock leaf 4 is movably fitted on the first rotating shaft 2. A return spring 5 and a limiting plate 6 are movably fitted on the second rotating shaft 3 respectively. The two ends of the return spring 5 are respectively connected to the lock housing 1 and the limiting plate 6. A drive shaft 7 is vertically inserted into the limiting plate 6. A tension spring 8 is connected between the drive shaft 7 and the lock leaf 4. The outer peripheral surface of the lock leaf 4 has a radially protruding abutment portion 4a along the first rotating shaft 2. The outer peripheral surface of the limiting plate 6 has an arc-shaped abutment surface 6a. Under the action of the return spring 5 and the tension spring 8, the abutment portion 4a of the lock leaf 4 abuts against the abutment surface 6a of the limiting plate 6.

[0023] Reference Figure 2 and Figure 3 Specifically, the limiting plate 6 has a insertion hole 6b, the size of which is larger than the size of the drive shaft 7, and the drive shaft 7 is axially limited within the insertion hole 6b of the limiting plate 6. In this embodiment, the insertion hole 6b is preferably an oblong hole, and the tension spring 8 is arranged parallel to the locking leaf 4 and the limiting plate 6.

[0024] Reference Figure 1 and Figure 2 More specifically, the drive shaft 7 has an annular protrusion 7a, and the drive shaft 7 is also fitted with an unlocking rod 9, a washer 7b and a bushing 7c. The washer 7b and the bushing 7c abut against the two end faces of the limiting plate 6, and the two sides of the unlocking rod 9 abut against the washer 7b and the annular protrusion 7a, respectively. The end of the drive shaft 7 away from the annular protrusion 7a is riveted to the limiting plate 6.

[0025] Reference Figure 1 , Figure 2 and Figure 3 Furthermore, the locking leaf 4 is also covered with a rubber sleeve 10, the abutting part 4a is exposed outside the rubber sleeve 10, one end of the tension spring 8 is connected to the drive shaft 7, and the other end of the tension spring 8 is connected to the rubber sleeve 10.

[0026] Reference Figure 2 and Figure 3 Specifically, the rubber sleeve 10 has an anti-collision part 10a, which is disposed on the edge of the rubber sleeve 10 away from the return spring 5, and the anti-collision part 10a is disposed opposite to the limiting plate 6.

[0027] The following explains the working principle of this car seat back lock:

[0028] When the backrest lock is in the locked state (see reference) Figure 3 The locking leaf 4's abutting part 4a abuts against the abutting surface 6a of the limiting plate 6. Simultaneously, under the action of the tension spring 8, and the combined action of the return spring 5 and the tension spring 8, the locking leaf 4 and the limiting plate 6 maintain a relatively stationary state under the action of friction (in this embodiment, the abutting surface 6a is preferably arc-shaped, and the contour curve conforms to the Archimedes curve, ensuring that the transmission angle of the limiting plate 6 to the locking leaf remains unchanged during the working stroke, and the transmission angle can be set to less than 5.7° to better meet the friction self-locking requirements). When the locking leaf 4 is subjected to an external force parallel to the direction of the clearance notch of the lock case 1 (i.e., when the bolt (not shown in the figure) located in the locking leaf 4 wants to disengage from the locking leaf 4), the locking leaf 4 continuously presses against the limiting plate 6 through the abutting part 4a, and the relative stationary state of the locking leaf 4 is achieved by the reaction force, thereby keeping the backrest lock in a locked state.

[0029] When the backrest lock needs to be unlocked, the user pulls the unlocking lever 9 to rotate the limiting plate 6, causing the abutting part 4a and the abutting surface 6a to disengage, thereby causing the lock leaf 4 to rotate and unlock under the action of the tension spring 8 (that is, the bolt (not shown in the figure) located in the lock leaf 4 disengages from the backrest lock at the clearance notch of the lock case 1).

[0030] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A car seat backrest lock, comprising a lock housing (1) and a first rotating shaft (2) and a second rotating shaft (3) respectively fixed on the lock housing (1), wherein a lock leaf (4) is movably sleeved on the first rotating shaft (2), and a return spring (5) and a limiting plate (6) are movably sleeved on the second rotating shaft (3), wherein the two ends of the return spring (5) are respectively connected to the lock housing (1) and the limiting plate (6), characterized in that, The driving shaft (7) is vertically inserted into the limiting plate (6), the pull spring (8) is connected between the driving shaft (7) and the lock leaf (4), the lock leaf (4) has the abutting portion (4a) protruding radially along the first rotating shaft (2) on the outer circumferential surface, the limiting plate (6) has the arc-shaped abutting surface (6a) on the outer circumferential surface, and the abutting portion (4a) of the lock leaf (4) abuts against the abutting surface (6a) of the limiting plate (6) under the action of the return spring (5) and the pull spring (8).

2. The automotive seat backrest lock according to claim 1, characterized in that The insertion hole (6b) is formed in the limiting plate (6), the size of the insertion hole (6b) is greater than the size of the driving shaft (7), and the driving shaft (7) is axially limited in the insertion hole (6b) of the limiting plate (6).

3. A car seat backrest lock according to claim 2, characterized in that The driving shaft (7) has the annular protruding portion (7a), the unlocking rod (9), the washer (7b) and the bushing (7c) are respectively sleeved on the driving shaft (7), the washer (7b) and the bushing (7c) abut against the two end surfaces of the limiting plate (6) respectively, the two sides of the unlocking rod (9) abut against the washer (7b) and the annular protruding portion (7a) respectively, and the end of the driving shaft (7) away from the annular protruding portion (7a) is riveted on the limiting plate (6).

4. The vehicle seat backrest lock according to claim 2, wherein The insertion hole (6b) is a waist-shaped hole, the pull spring (8) is arranged in parallel with the lock leaf (4) and the limiting plate (6).

5. A backrest lock according to claim 1 or 2 or 3 or 4, characterized in that, The lock leaf (4) is further covered with the rubber sleeve (10), the abutting portion (4a) is exposed outside the rubber sleeve (10), one end of the pull spring (8) is connected to the driving shaft (7), and the other end of the pull spring (8) is connected to the rubber sleeve (10).

6. A car seat backrest lock according to claim 5, characterized in that The rubber sleeve (10) has the anti-collision portion (10a) arranged at the edge of the rubber sleeve (10) away from the return spring (5), and the anti-collision portion (10a) is arranged opposite to the limiting plate (6).

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