Manual unlocking device for sliding plug door

Abstract

The present invention discloses a manual unlocking device for a Sierra door, which comprises: a base, an axial hole is provided in the middle of the base, and a reset protrusion is fixedly provided at one end of the base; a transmission shaft, the transmission shaft is rotatably connected in the axial hole, and one end of the transmission shaft is fixedly connected to the rotating shaft of the Sierra door; a force wheel, the force wheel is rotatably connected to the transmission shaft; a pawl groove and a pre-tightening spring groove are provided at one end of the force wheel, one end of the pawl groove is communicated with the inner side wall of the center hole, and a stepped reset inclined surface is provided between the pawl groove and the pre-tightening spring groove; a reset spring, the reset spring is sleeved on the outer peripheral side wall of the base, one end of the reset spring is fixedly connected to the base, and the other end is fixedly connected to the force wheel; a pawl, the pawl is rotatably connected in the pawl groove, the side wall of one end of the pawl abuts against the stepped reset inclined surface, and the side wall of the other end of the pawl abuts against the reset protrusion; a pre-tightening spring, the pre-tightening spring is embedded in the pre-tightening spring groove, and one side of the pre-tightening spring abuts against the pawl.

Description

Technical Field

[0001] The present invention belongs to the technical field of rail vehicles, and in particular relates to a manual unlocking device for a plug-in sliding door. Background Art

[0002] Rail vehicle sliding doors utilize an automatic locking mechanism to securely lock the door once fully closed. In emergencies, an unlocking mechanism is required to release the mechanical lock. Existing unlocking mechanisms for screw-driven sliding doors are complex and lack universal applicability.

[0003] Therefore, how to provide a manual unlocking device for a sliding door with a simple structure and easy use is an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a manual unlocking device for a sliding door, which is easy to use and can manually unlock the sliding door.

[0005] In order to achieve the above-mentioned object, the present invention adopts the following technical solution: a manual unlocking device for a sliding plug door, comprising:

[0006] A base, wherein an axial hole is opened in the middle of the base, and a reset protrusion is fixedly provided at one end of the base;

[0007] A transmission shaft, the transmission shaft being rotatably connected in the shaft hole, one end of the transmission shaft being fixedly connected to the rotating shaft of the plug sliding door;

[0008] A force wheel, wherein a center hole is provided in the middle of the force wheel, the force wheel is rotatably connected to the transmission shaft, and the force wheel is located at one end of the base; a pawl groove and a preload spring groove are formed at one end of the force wheel, one end of the pawl groove is connected to the inner side wall of the center hole, and a stepped reset inclined surface is provided between the pawl groove and the preload spring groove;

[0009] A return spring, wherein the return spring is sleeved on the outer peripheral side wall of the base, one end of the return spring is fixedly connected to the base, and the other end is fixedly connected to the force wheel;

[0010] a pawl, the pawl being rotatably connected in the pawl groove, the side wall of one end of the pawl abutting against the stepped reset inclined surface, and the side wall of the other end of the pawl abutting against the reset protrusion;

[0011] A pre-tightening spring is embedded in the pre-tightening spring groove, and one side of the pre-tightening spring abuts against the pawl.

[0012] The beneficial effects of the present invention are: one end of the transmission shaft is fixedly connected to the rotating shaft of the Sierra door, and the Sierra door is in an automatic locking state after being closed into place. The force wheel is not subject to external force, and is in an initial stable state under the joint action of the preload spring and the reset spring. In the stable state, the reset torque plays a leading role, and the force wheel drives the pawl to contact the reset protrusion on the base, and causes the pawl to rotate in the opposite direction, and one side surface of the pawl contacts the stepped reset inclined surface, thereby playing the role of mechanical limiter. At this time, there is a gap between the outer claw surface of the pawl and the outer side surface of the transmission shaft, and is in a non-contact state, thereby playing the role of transmission isolation. When manual unlocking is required, the boosting wheel is driven to rotate by a transmission method such as a rope. When the boosting wheel rotates a small angle, the pawl disengages from the reset protrusion, and the pawl rotates under the action of the preload spring, and its outer pawl surface contacts the outer cylindrical surface of the transmission shaft. At this time, due to the contact between the pawl and the transmission shaft, the transmission shaft is driven to rotate by friction to achieve unlocking. By properly configuring the parameters of the pawl, the manual unlocking assembly will be converted into a one-way overrunning clutch, thereby converting the manual unlocking motion into the unlocking rotational motion of the door mechanism transmission shaft. In other words, the base and the boosting wheel are rotatably mounted on the transmission shaft, and the pawl, preload spring and reset spring are arranged between the base and the boosting wheel. The torque relationship between them is used to selectively engage the pawl with the transmission shaft, thereby driving the transmission shaft to unlock the sliding door. The present invention has a simple structure and high reliability. The present invention is a direct unlocking device that directly rotates the boosting wheel to achieve unlocking, and has high versatility. The present invention fully inherits the advantages of the overrunning clutch, has a large manual unlocking stroke, and thus does not require a high screw lead, and has a wide range of applications.

[0013] Preferably, the other end of the transmission shaft is threadedly connected with a locking nut.

[0014] Preferably, it also includes an adapter and an auxiliary support plate, the adapter is fixed to the other end of the base, the adapter is fixed on the Sierra door, one end of the auxiliary support plate is fixedly connected to the base, and the other end of the auxiliary support plate extends to the outer end side of the force wheel.

[0015] Preferably, the groove depth of the pawl groove is greater than the groove depth of the preload spring groove, and one side of the pawl groove is connected to one side of the preload spring groove.

[0016] Preferably, the preload spring is a U-shaped leaf spring, and the initial loading torque of the return spring is greater than the initial loading torque of the preload spring.

[0017] Preferably, the base is a cylindrical structure, a perforated partition is provided on the inner side of the base, the reset protrusion is fixed on the inner wall of one end of the base, and a shoulder is provided on the edge of the outer wall of the other end of the base, and a slot is provided on the shoulder.

[0018] Preferably, a groove is provided at one end of the force-adding wheel close to the base, one end of the return spring is clamped in the groove, and the other end is clamped in the groove.

[0019] Preferably, the two ends of the pawl's rotation stroke correspond to an initial state and a working state, respectively. In the initial state, the side surface of one end of the pawl abuts against the stepped reset slope, and there is a spacing distance between the outer arc cylinder of the pawl and the transmission shaft. In the working state, the force-adding wheel rotates, and one end of the pawl disengages from the reset protrusion. Under the elastic action of the preloaded spring, the pawl rotates at an angle so that its outer arc cylinder contacts the outer side surface of the transmission shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view of a manual unlocking device for a sliding plug door according to the present invention;

[0021] Figure 2 This is an assembly diagram of a force-adding wheel, a pawl, and a pre-tightening spring of a manual unlocking device for a sliding plug door according to the present invention;

[0022] Figure 3 This is a diagram showing the position relationship between the base, pawl, and preload spring of a manual unlocking device for a sliding plug door according to the present invention;

[0023] Figure 4 A manual unlocking device for a sliding plug door according to the present invention Figure 2 AA rotated section view;

[0024] Figure 5 A three-dimensional diagram of a manual unlocking device for a sliding plug door according to the present invention;

[0025] Figure 6 This is a structural diagram of the base of a manual unlocking device for a sliding plug door according to the present invention;

[0026] Figure 7 This is a structural diagram of a force-adding wheel of a manual unlocking device for a sliding plug door according to the present invention;

[0027] Figure 8 This is a schematic diagram of the initial state of a pawl of a manual unlocking device for a plug-in sliding door according to the present invention.

[0028] 1 locking nut, 2 force wheel, 3 transmission shaft, 4 preload spring, 5 auxiliary support plate, 6 return spring, 7 base, 8 adapter, 9 pawl, 701 return protrusion, 201 pawl groove, 202 stepped return inclined surface, 203 preload spring groove. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See the attached Figures 1 to 8 According to an embodiment of the present invention, a manual unlocking device for a sliding plug door comprises:

[0031] A base 7, wherein an axial hole is provided in the middle of the base 7 and a reset protrusion 701 is fixedly provided at one end of the base 7;

[0032] The transmission shaft 3 is rotatably connected in the shaft hole, and one end of the transmission shaft 3 is fixedly connected to the rotating shaft of the plug sliding door;

[0033] The boosting wheel 2 has a center hole in the middle thereof and is rotatably connected to the transmission shaft 3. Specifically, the boosting wheel and the base are assembled with the transmission shaft via bearings. The boosting wheel 2 is located at one end of the base 7. A pawl groove 201 and a preload spring groove 203 are formed at one end of the boosting wheel 2. One end of the pawl groove 201 is connected to the inner side wall of the center hole. A stepped reset inclined surface 202 is provided between the pawl groove 201 and the preload spring groove 203. The pawl groove has a movable range for the pawl.

[0034] The return spring 6 is sleeved on the outer peripheral side wall of the base 7. One end of the return spring 6 is fixedly connected to the base 7, and the other end is fixedly connected to the force wheel 2;

[0035] The pawl 9 is rotatably connected to the pawl groove 201, with one end side wall of the pawl 9 abutting against the stepped reset inclined surface 202, and the other end side wall of the pawl 9 abutting against the reset protrusion 701; the pawl is columnar;

[0036] The preload spring 4 is embedded in the preload spring slot 203 , and one side of the preload spring 4 abuts against the pawl 9 .

[0037] In other embodiments, the other end of the transmission shaft 3 is threadedly connected to a locking nut 1. The locking nut limits the installation position of the force wheel on the transmission shaft.

[0038] In other specific embodiments, an adapter seat 8 and an auxiliary support plate 5 are also included. The adapter seat 8 is fixed to the other end of the base 7, and the adapter seat 8 is fixed on the Sierra door. One end of the auxiliary support plate 5 is fixedly connected to the base 7, and the other end of the auxiliary support plate 5 extends to the outer end side of the force wheel 2.

[0039] In some other embodiments, the depth of the pawl groove 201 is greater than that of the preload spring groove 203, and one side of the pawl groove 201 communicates with one side of the preload spring groove 203. A stepped reset surface is formed between the pawl groove and the preload spring groove, corresponding to one side wall of the pawl groove. The pawl is retained within the pawl groove, and the stepped reset surface constrains the pawl's initial position.

[0040] In some other specific embodiments, the preload spring 4 is a U-shaped leaf spring, and the initial loading torque of the return spring 6 is greater than the initial loading torque of the preload spring 4. One side of the preload spring elastically abuts the pawl, and the other side elastically abuts the side wall of the preload spring groove.

[0041] Specifically, the base 7 is a cylindrical structure, a perforated partition is provided on the inner side of the base 7, the reset protrusion 701 is fixed on the inner wall of one end of the base 7, and a shoulder is provided on the edge of the outer wall of the other end of the base 7, and a slot is provided on the shoulder.

[0042] In other embodiments, a groove is provided at one end of the force wheel 2 near the base, and one end of the return spring 6 is engaged in the groove and the other end is engaged in the groove. In the initial state, the positions of the base and the force wheel are relatively fixed.

[0043] In other specific embodiments, the two ends of the rotation stroke of the pawl 9 correspond to the initial state and the working state respectively. In the initial state, the pawl has a tendency to rotate under the action of the reset spring on the force wheel. One end of the pawl is located in the pawl groove, so that the pawl follows the rotation trend, but the other end of the pawl abuts against the reset protrusion on the base. The pawl can only rely on the stepped reset inclined surface to achieve mechanical limiting. There is a spacing distance between the outer arc cylindrical surface of the pawl 9 and the transmission shaft 3. In the working state, the force wheel 2 rotates, and one end of the pawl 9 is out of contact with the reset protrusion 701. At this time, the pawl 9 is only acted upon by the pre-tightening spring. Under the elastic action of the pre-tightening spring, the pawl rotates at an angle so that its outer arc cylindrical surface contacts the outer side surface of the transmission shaft.

[0044] The outer arc cylinder of the pawl must be able to achieve both engagement and separation with the outer cylinder of the transmission shaft during rotation, so as to achieve the rotation unlocking of the transmission shaft.

[0045] The specific working process of a manual unlocking device for a sliding plug door of the present invention is as follows: One end of the transmission shaft of the manual unlocking device for the sliding plug door is fixedly connected to the rotating shaft of the sliding plug door, and the sliding plug door enters an automatically locked state after being fully closed. The manual unlocking device's energizing wheel is not subject to external force, and the manual unlocking device is in an initial stable state under the combined action of a preload spring and a return spring. Because the return torque of the return spring is greater than the torque of the preload spring, the energizing wheel drives the ratchet to contact the return protrusion on the base, causing the ratchet to rotate in the opposite direction and contact the return inclined surface, thereby acting as a mechanical limiter. At this time, the outer cylindrical surface of the ratchet is in a non-contact state with the outer cylindrical surface of the transmission shaft, thereby providing transmission isolation. When manual unlocking is required, the energizing wheel is driven to rotate by a transmission method such as a rope. When the energizing wheel rotates a small angle, the ratchet disengages the return protrusion, and the ratchet rotates under the action of the preload spring, and its outer cylindrical surface contacts the cylindrical surface of the transmission shaft. When the parameters of the ratchet are properly configured, the manual unlocking assembly is transformed into a one-way overrunning clutch, thereby converting the manual unlocking motion into the unlocking rotational motion of the door mechanism's transmission shaft.

[0046] As for the devices and methods of use disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the methods.

[0047] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A manual unlocking device for a sliding plug door, characterized in that: include: A base (7), wherein an axial hole is provided in the middle of the base (7), and a reset protrusion (701) is fixedly provided at one end of the base (7); A transmission shaft (3), the transmission shaft (3) being rotatably connected in the shaft hole, and one end of the transmission shaft (3) being fixedly connected to the rotating shaft of the plug sliding door; A force wheel (2), wherein a center hole is provided in the middle of the force wheel (2), the force wheel (2) is rotatably connected to the transmission shaft (3), and the force wheel (2) is located at one end of the base (7); a ratchet groove (201) and a preload spring groove (203) are provided at one end of the force wheel (2), one end of the ratchet groove (201) is communicated with the inner side wall of the center hole, and a stepped reset inclined surface (202) is provided between the ratchet groove (201) and the preload spring groove (203); A return spring (6), wherein the return spring (6) is sleeved on the outer peripheral side wall of the base (7), one end of the return spring (6) is fixedly connected to the base (7), and the other end is fixedly connected to the force wheel (2); A pawl (9), the pawl (9) is rotatably connected in the pawl groove (201), the pawl groove has a movable amount of the pawl, one end side wall of the pawl (9) abuts against the stepped reset inclined surface (202), and the other end side wall of the pawl (9) abuts against the reset protrusion (701), and the pawl is columnar; A preload spring (4), wherein the preload spring (4) is embedded in the preload spring slot (203), and one side of the preload spring (4) abuts against the pawl (9).

2. A manual unlocking device for sliding plug doors according to claim 1, characterized in that: The other end of the transmission shaft (3) is threadedly connected to a locking nut (1).

3. A manual unlocking device for sliding plug doors according to claim 2, characterized in that: It also includes an adapter seat (8) and an auxiliary support plate (5), wherein the adapter seat (8) is fixed to the other end of the base (7), the adapter seat (8) is fixed on the sliding door, one end of the auxiliary support plate (5) is fixedly connected to the base (7), and the other end of the auxiliary support plate (5) extends to the outer end side of the boosting wheel (2).

4. A manual unlocking device for sliding plug doors according to claim 3, characterized in that: The groove depth of the ratchet groove (201) is greater than the groove depth of the preload spring groove (203), and one side of the ratchet groove (201) is connected to one side of the preload spring groove (203).

5. A manual unlocking device for sliding plug doors according to claim 4, characterized in that: The preload spring (4) is a U-shaped leaf spring, and the initial loading torque of the return spring (6) is greater than the initial loading torque of the preload spring (4).

6. A manual unlocking device for sliding plug doors according to claim 5, characterized in that: The base (7) is a cylindrical structure. A perforated partition is provided on the inner side of the base (7). The reset protrusion (701) is fixed on the inner wall of one end of the base (7). A shoulder is provided around the edge of the outer wall of the other end of the base (7). A slot is provided on the shoulder.

7. A manual unlocking device for sliding plug doors according to claim 6, characterized in that: A groove is provided at one end of the force wheel (2) close to the base, one end of the return spring (6) is clamped in the clamping groove, and the other end is clamped in the groove.

8. A manual unlocking device for a sliding plug door according to claim 7, characterized in that: The two ends of the rotation stroke of the pawl (9) correspond to the initial state and the working state respectively. In the initial state, the side surface of one end of the pawl (9) abuts against the stepped reset inclined surface, and there is a distance between the outer arc-shaped cylindrical surface of the pawl (9) and the transmission shaft (3). In the working state, the force wheel (2) rotates, and one end of the pawl (9) is disengaged from the reset protrusion (701). The pawl (9) rotates at an angle under the elastic action of the preloaded spring so that its outer arc-shaped cylindrical surface contacts the outer side surface of the transmission shaft.

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