Mechanism for increasing rack retention of push rod actuator

Abstract

The utility model relates to the technical field of household appliance accessories, in particular to a mechanism for increasing the rack retaining force of a push rod actuator, which comprises a rack, a pawl and a rack accommodating box, the rack is positioned in the rack accommodating box, the pawl is movably arranged at the tail part of the rack, a tooth surface is arranged on the bottom surface of the rack accommodating box, and the rack accommodating box is fixedly connected with the pawl. A pressing block is further arranged at the tail of the rack, one end of the pawl can be clamped with the tooth surface, and the other end of the pawl abuts against the pressing block. After the rack is pushed out in place under the action of the motor and the motor is powered off, the shovel-base-shaped clamping part at the front end of the pawl is clamped with the tooth surface, and the pressing part is in contact with the pressing block to provide good holding force for the rack; when the rack is recycled, the spring acts on the pawl to prevent the pawl from rotating anticlockwise, then the downward pressing inclined face of the pressing block makes contact with the pressing connection part to enable the pawl to rotate clockwise, the pawl is separated from the tooth face, the rack is recycled, the structure is simple, and reliability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of household appliance accessories, and in particular relates to a mechanism for increasing the holding force of a rack of a push rod actuator. Background Art

[0002] With economic development and social progress, people's living standards have significantly improved. As essential appliances, home appliances continue to influence our lifestyles. When applied to the home appliance industry, push rod actuators require a certain amount of retention force after the rack is pushed out. Existing push rod actuators lack a dedicated mechanism to increase the rack's retention force after it is pushed out, resulting in poor rack retention and failing to meet the required requirements.

[0003] Therefore, it is necessary to design a mechanism for increasing the rack holding force of the push rod actuator. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, the utility model provides a mechanism for increasing the holding force of the rack of the push rod actuator, which has a reasonable design and a simple structure and can provide sufficient holding force in the holding stage after the rack is pushed out.

[0005] Technical Solution: To achieve the above-mentioned objectives, the present invention provides a mechanism for increasing the holding force of a push rod actuator rack, comprising a rack, a pawl, and a rack housing. The rack is located within the rack housing, and the pawl is movably disposed at the rear end of the rack. The bottom surface of the rack housing is provided with a toothed surface, and a pressure block is also provided at the rear end of the rack. One end of the pawl engages with the toothed surface, while the other end abuts against the pressure block. Normally, the rack is contained within the rack housing. After the rack is pushed into position, one end of the pawl engages with the toothed surface, while the other end contacts the pressure block, thereby providing a certain holding force for the rack.

[0006] Furthermore, a mounting shaft is provided in the middle of the pawl, a group of mounting holes are provided on both sides of the tail of the rack, the mounting shaft is provided in the mounting holes, and the pawl can rotate around the mounting shaft.

[0007] Furthermore, the mounting hole is a rectangular hole along the length direction of the rack. The mounting shaft can move in the mounting hole, that is, the pawl can move back and forth in the mounting hole.

[0008] Furthermore, the pawl includes a front-end engaging portion and a rear-end pressing portion, wherein the engaging portion is shaped like a shovel base and the pressing portion is a rectangular block. The shovel-shaped engaging portion can engage with the tooth surface, and the pressing portion can contact the pressing block, thereby transmitting torque between the pawl and the rack.

[0009] Furthermore, the pressing block is located above the pawl and is provided with a downward pressing inclined surface, which cooperates with the pressing portion. The downward pressing inclined surface cooperates with the pressing portion, and under the action of the downward pressing inclined surface, the pawl can be rotated, thereby separating the engaging portion from the tooth surface, and the rack can be normally retracted.

[0010] Furthermore, the tooth surface includes a plurality of evenly spaced protruding teeth, each having a triangular cross-section, with one side aligned with the bottom of the rack housing and the other two sides angled toward the side where the rack is pushed out. This tooth surface design prevents the protruding teeth from interacting with the pawl when the rack is pushed out. Once the rack is in place, the pawl engages the protruding teeth, providing a certain amount of retention force on the rack.

[0011] Furthermore, a spring is provided on the side of the rear end of the rack, facing the lower portion of the crimping portion. When the rack is retracted, the spring first acts on the lower portion of the crimping portion to prevent the pawl from rotating counterclockwise. As the rack is retracted further, the downward pressure slope acts on the upper portion of the crimping portion, causing the pawl to rotate clockwise around the mounting axis, separating the engaging portion from the protruding teeth, and allowing the rack to retract normally.

[0012] Furthermore, it also includes a motor, and a driving gear is provided at the end of the output shaft of the motor, and the driving gear is engaged with the rack.

[0013] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0014] 1. The utility model provides a mechanism for increasing the holding force of the rack of a push rod actuator. After the rack is pushed into place under the action of the motor and the motor is powered off, the shovel-shaped engaging portion at the front end of the pawl engages with the tooth surface, and the crimping portion contacts the pressure block to provide good holding force for the rack; when the rack is retracted, the spring acts on the pawl to prevent it from rotating counterclockwise, and then the downward pressing inclined surface of the pressure block contacts the crimping portion to cause the pawl to rotate clockwise, the pawl disengages from the tooth surface, and the rack is retracted. It has a simple structure and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a mechanism for increasing the rack holding force of a push rod actuator according to the present invention;

[0016] Figure 2 This is a schematic diagram of the installation of the pawl and rack described in the present utility model;

[0017] Figure 3 It is a structural schematic diagram of the pawl described in the utility model.

[0018] In the figure: 1- rack, 11- pressure block, 111- downward pressing slope, 12- mounting hole, 13- spring, 2- pawl, 21- mounting shaft, 22- engaging portion, 23- pressing portion, 3- rack accommodating box, 31- tooth surface, 4- motor, 41- driving gear. DETAILED DESCRIPTION

[0019] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] like Figure 1 As shown, a mechanism for increasing the rack holding force of a push rod actuator includes a rack 1, a pawl 2, and a rack housing 3. The rack 1 is located within the rack housing, and the pawl 2 is movably disposed at the rear end of the rack 1. The bottom surface of the rack housing 3 is provided with a tooth surface 31. A pressure block 11 is also provided at the rear end of the rack 1. One end of the pawl 2 can engage with the tooth surface 31, and the other end abuts against the pressure block 11. The pawl 2 cooperates with the tooth surface 31 to provide holding force to the rack 1. When the rack 1 retracts, the pressure block depresses the pawl 2 downward to separate it from the tooth surface 31 without hindering the retraction of the rack 1.

[0021] like Figure 2 As shown, a mounting shaft 21 is provided in the middle of the pawl 2, and a group of mounting holes 12 are provided on both sides of the tail of the rack 1, and the mounting shaft 21 is provided in the mounting holes.

[0022] The mounting hole 12 is a rectangular hole along the length of the rack 1. The pawl 2 can move and rotate linearly in the mounting hole, and its stroke is no greater than the length of the rectangular hole.

[0023] like Figure 3 As shown, the pawl 2 includes a front-end engaging portion 22 and a rear-end pressing portion 23 , wherein the engaging portion 22 is in a shovel-base shape and the pressing portion 23 is a rectangular block.

[0024] like Figure 2 As shown, the pressing block 11 is located above the pawl 2 and is provided with a downward pressing inclined surface 111, which cooperates with the crimping portion 23. When the rack 1 is retracted, the rack 1 and the pawl 2 move relative to each other and approach each other. The downward pressing inclined surface 111 acts on the upper part of the crimping portion 23. Due to the design of its inclined surface, the horizontal force is decomposed into a downward force. This downward force causes the pawl 2 to rotate clockwise and disengage from the tooth surface.

[0025] In addition, the tooth surface 31 includes a plurality of evenly distributed protruding teeth, each of which has a triangular cross-section, with one side being in contact with the bottom of the rack housing 3 and the other two sides being inclined toward the side where the rack 2 is pushed out. The protruding teeth can clamp the engaging portion 22, providing a retaining force for the rack 1.

[0026] Please continue reading Figure 2A spring 13 is further provided on the side surface of the tail end of the rack 1, and the spring 13 is opposite to the lower part of the crimping portion 23. When the rack 1 is retracted, the spring 13 first contacts the lower part of the crimping portion 23 and exerts a force thereon to prevent the pawl 2 from rotating counterclockwise and becoming more tightly engaged with the tooth surface 31. As the rack 1 continues to retract, the pressing inclined surface 111 contacts the crimping portion 23, and the pawl 2 rotates clockwise, causing the front end of the engaging portion 22 to disengage from the tooth surface 31. During the process of the rack 1 being retracted, the bottom surface of the engaging portion 22 acts on the top surface of the convex tooth. The spring 13 cooperates with the pressing inclined surface 111 to act on the crimping portion 23, so that the front end of the engaging portion 22 always remains tilted upward to avoid being stuck in the tooth surface 31.

[0027] like Figure 1 As shown, a motor 4 is further included. A driving gear 41 is provided at the end of the output shaft of the motor 4 , and the driving gear 41 is engaged with the rack 1 .

[0028] This utility model provides a mechanism for increasing the rack holding force of a push rod actuator. When the rack push motor is powered off, a pawl engages with the tooth surface, providing rack holding force, similar to a one-way ratchet. When the rack is retracted, the pawl separates from the tooth surface under the action of a pressure block and spring. This mechanism features a simple structure and high reliability.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as within the scope of protection of the present invention.

Claims

1. A mechanism for increasing the rack holding force of a push rod actuator, characterized in that: The invention comprises a rack (1), a pawl (2) and a rack accommodating box (3), wherein the rack (1) is located in the rack accommodating box, the pawl (2) is movably arranged at the tail of the rack (1), the bottom surface of the rack accommodating box (3) is provided with a tooth surface (31), and the tail of the rack (1) is also provided with a pressure block (11), one end of the pawl (2) can be engaged with the tooth surface (31), and the other end can abut against the pressure block (11).

2. A mechanism for increasing the rack holding force of a push rod actuator according to claim 1, characterized in that: A mounting shaft (21) is provided in the middle of the pawl (2), and a group of mounting holes (12) are provided on both sides of the tail of the rack (1), and the mounting shaft (21) is provided in the mounting holes.

3. A mechanism for increasing the rack holding force of a push rod actuator according to claim 2, characterized in that: The mounting hole (12) is a rectangular hole along the length direction of the rack (1).

4. A mechanism for increasing the rack holding force of a push rod actuator according to claim 1, characterized in that: The ratchet (2) comprises a front-end engaging portion (22) and a rear-end pressing portion (23); the engaging portion (22) is in the shape of a shovel base, and the pressing portion (23) is a rectangular block.

5. A mechanism for increasing the rack holding force of a push rod actuator according to claim 4, characterized in that: The pressing block (11) is located above the pawl (2), and the pressing block (11) is provided with a downward pressing inclined surface (111), and the downward pressing inclined surface (111) cooperates with the crimping portion (23).

6. A mechanism for increasing the rack holding force of a push rod actuator according to claim 5, characterized in that: The tooth surface (31) includes a plurality of evenly distributed protruding teeth, the cross section of the protruding teeth is triangular, one side of the protruding teeth is in contact with the bottom of the rack housing box (3), and the other two sides are inclined toward the side where the rack (1) is pushed out.

7. A mechanism for increasing the rack holding force of a push rod actuator according to claim 6, characterized in that: A spring (13) is also provided on the side of the tail portion of the rack (1), and the spring (13) is opposite to the lower portion of the crimping portion (23).

8. The mechanism for increasing the rack holding force of a push rod actuator according to claim 1, characterized in that: It also includes a motor (4), and a driving gear (41) is provided at the end of the output shaft of the motor (4), and the driving gear (41) is meshed with the rack (1).

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