Pin puller reset tool

Abstract

This invention provides a pin puller reset fixture, comprising three parts: a support assembly, a sliding assembly, and a force transmission assembly. The support assembly provides overall support and a fulcrum for the fixture. The sliding assembly includes a sliding bolt, a bearing bolt, and a connecting shaft. The upper end of the sliding bolt is connected to a force transmission pin, and the lower end of the connecting shaft is connected to a sliding pin on the pin puller. The sliding bolt and the connecting shaft are connected by the bearing bolt. The force transmission assembly includes a handle and a force transmission pin. Based on the lever principle, the downward pressure applied by the operator to the handle is transmitted to the sliding assembly via the force transmission pin, pulling the sliding assembly upward and thus pulling the pin of the pin puller out of the retainer, completing the reset. The sliding assembly of this invention always moves longitudinally, making the reset operation labor-saving and efficient; it avoids jamming during reset, ensuring high reset reliability; the lower sections of the support frame and connecting shaft can be extended as needed to match different application scenarios, making it highly versatile.

Description

Technical Field

[0001] This utility model relates to the field of mechanical tooling technology, and in particular to a mechanical tooling for resetting a pin puller. Background Technology

[0002] During the operation of a mechanical device, it is necessary to constrain certain components to a specific state. Once a designated working condition is reached, the constraint is released according to an instruction. This function is achieved by an unlocking mechanism. In the prior art, a pin puller is a typical unlocking mechanism. It is fixed to the connecting structure and restricts the movement of the separating structure through an extended sliding pin. When unlocking is required, the sliding pin is driven to retract, releasing the constraint on the separating structure.

[0003] Patent CN112777005A discloses a shape memory metal (SMA) pin puller with high shear resistance. Its structure is shown in Figures 1(a) and 1(b). In the locked state, the drive spring is fully compressed, and the ball bearings are balanced by the combined action of the sliding sleeve, retainer, and pin. The pin is held in the extended state by the constraint of the ball bearings, achieving the locking function. When unlocking is required, the SMA wire is energized. The SMA wire contracts upon heating, causing the sliding sleeve to move upwards. The ball bearings lose balance and fall into the storage space at the bottom of the sliding sleeve. The pin is moved downwards by the pressure of the drive spring, completing the pin pull. Simultaneously, the return spring enters the compressed state. When resetting is required, the following method is used... Figure 2 The reset fixture shown pulls the sliding pin out of the cage. After the sliding pin moves a certain distance, its trapezoidal groove reaches the cage's circular hole. Under the lateral pressure of the inclined surface of the groove in the middle of the sleeve, the ball enters the trapezoidal groove of the sliding pin. The reset spring pushes the sleeve downward until the inclined surface of the upper groove of the sleeve contacts the ball, thus completing the pin puller reset. This invention adopts a pin-cage structure with a shaft-hole fit and an indirect drive method, which has technical advantages such as high fitting accuracy, large load capacity, smooth pin pulling, and high reliability.

[0004] The reset fixture disclosed in the above patent uses the lever principle. It applies downward pressure to the upper end of the two handles (in the direction shown in the figure), and the lower end of the handle "pryes" the arc-shaped area of ​​the sliding bolt, causing the sliding bolt to move upward, thereby driving the bolt connected to the sliding pin of the puller to move upward, realizing the reset function of pulling the sliding pin out of the cage. This fixture operates on the principle of "friction prying." To successfully complete the reset operation, it is necessary to ensure that the handle is not jammed during the downward pressing process and that the lower end of the handle and the arc-shaped surface of the sliding bolt do not disengage. This necessitates a precise fit between the lower end of the handle and the arc-shaped surface of the sliding bolt, thus placing high demands on the machining and assembly of the parts. With repeated use, the mating surfaces will inevitably experience wear due to friction, making slippage during operation difficult to avoid. When there is a significant difference in the pressure applied to the two handles, the force on the arc-shaped surface of the sliding bolt is uneven, and the lateral force on the sliding bolt cannot be completely offset, easily causing the sliding bolt to jam and become unable to move, leading to reset failure. In addition, the mating surface between the lower end of the reset fixture and the sliding bolt is approximately in line contact, resulting in low frictional force transmission efficiency and making the reset operation laborious. Summary of the Invention

[0005] This utility model addresses the shortcomings of existing pin puller reset fixtures by providing a reset fixture suitable for pin pullers, characterized by simple structure, high reliability, and labor-saving features. The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A pin puller reset fixture comprises three parts: a support component, a sliding component, and a force transmission component. The support component provides overall support and a fulcrum for the fixture. The sliding component is connected to the sliding pin on the pin puller, and the force transmission component, based on the lever principle, transmits the force input by the operator to the sliding component, pulling the sliding component to move, thereby pulling the sliding pin out of the pin puller holder and realizing the reset of the pin puller.

[0006] The sliding assembly includes a sliding bolt, a bearing bolt, and a connecting shaft, with the sliding bolt and connecting shaft connected by the bearing bolt. The lower section of the sliding bolt is a hollow cylindrical structure, while the upper section has a U-shaped groove for accommodating the handle head. The bottom of the U-shaped groove has a through hole for the bearing bolt to pass through, which communicates with the central hole of the lower section of the sliding bolt. Pin holes are provided on both ears of the U-shaped groove. The connecting shaft has a stepped shaft structure with a threaded section at the bottom. Rotating the connecting shaft allows it to be screwed into the reset threaded hole at the top of the sliding pin (hereinafter referred to as the sliding pin) of the reset object puller. The top of the connecting shaft has a central hole with internal threads for engaging with the threaded section of the bearing bolt. The bearing bolt is inserted through the through hole at the bottom of the U-shaped groove of the sliding bolt, passes through the central hole of the lower section of the sliding bolt, and its lower end connects with the internal thread of the connecting shaft. The bearing bolt and the sliding bolt have a clearance fit, allowing the connecting shaft to rotate automatically relative to the sliding bolt. This ensures that the sliding bolt transmits the pulling force for vertical movement to the connecting shaft while preventing the connecting shaft from transmitting torque to the sliding bolt during rotation.

[0007] The support components include a support frame, sliding bearings, and a rotating shaft.

[0008] The support frame is divided into three sections: upper, middle, and lower. The upper section is mainly used to connect the handle and accommodate the handle for lever operation, while the middle and lower sections provide sliding space for the sliding components.

[0009] The upper section of the support frame is provided with a support frame pivot hole, a handle groove, and a pin mounting hole: two pivot holes are provided in the front-to-back direction, corresponding to the handle pivot holes on the two handles respectively, for installing pivots and providing fulcrum for the handles; the handle groove is provided in the left-to-right direction, and is an oblong hole when viewed from the left / right side. The handle groove is used to accommodate the handle and the upward sliding component, and to provide operating space for the handle; the pin mounting hole is a through hole located at the front or rear of the support frame. This hole is a threaded through hole with a diameter larger than that of the force transmission pin, used to insert the force transmission pin through the hole during assembly, thereby connecting the handle and the sliding bolt. After the force transmission pin is installed, the hole can be sealed with a screw.

[0010] The middle and lower sections of the support frame are integrally hollow cylindrical structures. The inner hole of the middle and lower sections is connected to the waist-shaped handle groove of the upper section. The sliding bolt and the support frame are in a hole-shaft sliding fit, allowing the sliding bolt to slide up and down within the support frame. The middle section of the support frame is equipped with a connecting shaft rotation groove, used to operate the connecting shaft to rotate, thereby achieving a threaded connection between the lower thread of the connecting shaft and the inner threaded hole at the top of the sliding pin.

[0011] In addition, a sliding bearing is installed in the lower section of the support frame. The center hole of the sliding bearing and the connecting shaft are precisely matched to ensure that the free rotation and longitudinal sliding of the connecting shaft do not interfere with each other.

[0012] The force transmission assembly includes two handles, left and right, and a force transmission pin connecting the two handle heads. One handle head is U-shaped, and the other is flat. Both the U-shaped and flat structures have pin holes for installing the force transmission pin. The flat structure is inserted into the U-shaped structure and together they are embedded in the U-shaped groove of the sliding bolt. The force transmission pin passes through the pin hole of the sliding bolt and the pin hole on the handle, thereby connecting the handle head to the sliding bolt. Both handles also have pivot holes, whose positions correspond to the pivot holes on the support frame, for inserting pivots to connect the handles and the support frame, providing a fulcrum for lever-type operation of the handles.

[0013] During the reset operation, align the lower end of the support frame with the retainer of the pin puller, rotate the connecting shaft through the rotating groove, screw the threaded part of its lower end into the internal threaded hole at the top of the sliding pin, and then apply downward pressure to the handles on both sides. Through the lever action, the sliding assembly moves upward, thereby pulling the sliding pin out of the retainer, and the pin puller reset is completed.

[0014] Furthermore, the top of the support frame is provided with a set screw hole for screwing in a screw to press the rotating shaft and prevent it from accidentally coming out.

[0015] Furthermore, the pin hole on the handle for installing the force transmission pin is an oblong hole, which makes the assembly operation easier and can prevent the two handles from interfering with each other and getting stuck.

[0016] Furthermore, the lower section of the support frame is also provided with a groove for accommodating a retaining ring, which is used to install the retaining ring to longitudinally limit the sliding bearing.

[0017] Furthermore, the lower section of the support frame is provided with external threads, which can be connected to the extension section to adapt to different application scenarios.

[0018] Compared with the prior art, the beneficial effects of this utility model are reflected in:

[0019] (1) Effortless operation. The upper end of the connecting shaft of this utility model is connected to the sliding bolt via a bearing bolt, and the lower end is precisely fitted with the center hole of the sliding bearing. The sliding bolt and the support frame are in a sliding fit with the hole and the shaft, and the sliding bolt and the bearing bolt are in a clearance fit. This ensures that the movement of the sliding bolt and the connecting shaft is always longitudinal, and the reset operation is effortless and efficient.

[0020] (2) High reliability. This utility model uses a force transmission pin to transmit the force of the handle to the sliding bolt, and the connection between the handle and the force transmission pin adopts an oblong hole, which makes the installation simple. The force application process of the two handles does not interfere with each other, and the reset operation can be completed by applying force to one handle. This effectively avoids the problem of jamming caused by uneven force or interference between the two handles, and the reset operation has high reliability.

[0021] (3) High versatility. The lower section of the support frame and the lower section of the connecting shaft of this utility model are provided with external thread structure, which can be extended or the end shape can be changed to match different application scenarios and usage requirements. It is suitable for the reset operation of various pin pullers and can also be promoted for similar occasions where there is a need for pulling. Attached Figure Description

[0022] Figure 1(a) is a schematic diagram of the locking state structure of the prior art pin puller;

[0023] Figure 1(b) is a schematic diagram of the unlocking state structure of the existing pin puller;

[0024] Figure 2 This is a schematic diagram of the existing pin puller reset fixture structure;

[0025] Figure 3 This is a schematic diagram of the external shape of the resetting tool of this utility model;

[0026] Figure 4 This is a schematic diagram of the initial state structure of the reset tool of this utility model;

[0027] Figure 5This is a schematic diagram of the structure of the reset fixture after the reset operation is completed.

[0028] Figure 6 This is a schematic diagram of the sliding bolt structure of this utility model;

[0029] Figure 7 This is a schematic diagram of the assembly of the sliding bolt and handle of this utility model;

[0030] Figure 8 This is a schematic diagram of the support frame structure of this utility model;

[0031] The symbols in the attached diagrams have the following meanings: 1. Handle; 2. Force transmission pin; 3. Shaft; 4. Bearing bolt; 5. Sliding bolt; 6. Support frame; 7. Connecting shaft; 8. Sliding bearing; 9. Retaining ring; 101. Left handle; 102. Right handle; 103. Handle shaft hole; 501. Pin hole; 502. U-groove; 601. Set screw hole; 602. Support frame shaft hole; 603. Handle groove; 604. Pin mounting hole; 605. Connecting shaft rotation groove; 606. External thread. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] This utility model provides a pin puller reset fixture, the overall structure of which is as follows: Figures 3-5 As shown, it resembles a wine opener and includes a handle 1, a force transmission pin 2, a rotating shaft 3, a load-bearing bolt 4, a sliding bolt 5, a support frame 6, a connecting shaft 7, a sliding bearing 8, and a retaining ring 9.

[0034] The sliding bolt 5, the bearing bolt 4, and the connecting shaft 7 form a sliding assembly. The structure of the sliding bolt 5 is as follows: Figure 6 As shown, its lower section is a hollow cylindrical structure, and the upper section is a U-shaped groove 502 for accommodating the head of the handle 1. The bottom of the U-shaped groove 502 has a through hole for the bearing bolt 4 to pass through, and the two ears have pin holes 501. The connecting shaft 7 is a stepped shaft structure. The lower part has an external thread that matches the internal thread of the top reset hole of the pin puller, and the top has a center hole with internal thread for connecting the bearing bolt 4. The bearing bolt 4 passes through the through hole at the bottom of the U-shaped groove 502 of the sliding bolt 5, and its lower end is connected to the internal thread of the top center hole of the connecting shaft 7, thereby connecting the sliding bolt 5 and the connecting shaft 7. The bearing bolt 4 and the sliding bolt 5 are clearance-fitted, and the connecting shaft 7 can rotate automatically relative to the sliding bolt 5. This ensures that the sliding bolt 5 transmits the tension of vertical movement to the connecting shaft 7, and also avoids the transmission of torque to the sliding bolt 5 when the connecting shaft 7 rotates.

[0035] Handle 1 includes a left handle 101 and a right handle 102, the specific structure of which is as follows: Figure 7As shown, the head of the left handle 101 is a U-shaped structure, and the head of the right handle 102 is a flat structure (the end near the sliding bolt 5 in the figure is called the head). Both the U-shaped structure and the flat structure are provided with waist-shaped pin holes. The flat structure of the right handle 102 is inserted into the U-shaped structure of the left handle 101, and together they are embedded in the U-shaped groove 502 of the sliding bolt. The force-transmitting pin 2 passes through the pin hole 501 of the sliding bolt 5 and the waist-shaped hole of the handle 1 head, thereby connecting the handle 1 with the sliding bolt 5. The handle 1 is also provided with a handle pivot hole 103 (the same for both left and right handles), which is used to insert the pivot 3, thereby connecting the handle 1 and the support frame 6, providing a fulcrum for the handle 1 to work in a lever-like manner.

[0036] The structure of support frame 6 is as follows Figure 8 As shown, the support frame 6 is generally divided into three sections: upper, middle, and lower. The upper section is mainly used to connect the handle 1 and accommodate it for lever operation. The upper section of the support frame 6 has set screw holes 601, support frame pivot holes 602, handle grooves 603, and pin mounting holes 604. The support frame pivot holes 602 are arranged along the front-to-back direction, and their positions correspond to the handle pivot holes 103. They are used to install the pivot 3 and provide a fulcrum for the handle 1. The four set screw holes 601 at the top are used to screw in set screws (not shown in the figure) to press the pivot 3 on both sides and prevent it from accidentally coming out. The handle groove 603 is arranged along the left-to-right direction of the support frame 6. It is waist-shaped and runs horizontally through the frame, providing operating space for the handle. The pin mounting holes 604 are through holes provided on the front or rear side (only one side is required). They are used to pass through the force transmission pin 2 to connect the handle 1 and the sliding bolt 5. This hole is a threaded hole. After the force transmission pin 2 is installed, a screw needs to be screwed into the pin mounting hole 604 to seal it. The middle and lower sections of the support frame 6 are longitudinally hollow cylindrical structures. The inner hole of the middle and lower sections is connected to the transverse handle groove of the upper section, allowing the sliding assembly to move up and down. The sliding bolt 5 and the support frame 6 are in a hole-shaft sliding fit, allowing the sliding bolt 5 to slide up and down within the support frame 6. The connecting shaft rotation groove 605 is located in the middle section of the support frame 6 and is used to rotate the connecting shaft 7, thereby connecting the lower thread of the connecting shaft with the inner threaded hole at the top of the pin puller. The lower section of the support frame 6 is provided with an external thread 606, allowing the support frame to be extended or its end shape to be changed according to different application scenarios and usage requirements.

[0037] In addition, a sliding bearing 8 and a retaining ring 9 for longitudinally limiting the sliding bearing 8 are installed in the lower section of the support frame 6. The inner hole of the sliding bearing 8 and the connecting shaft 7 are precisely matched with each other, which can ensure that the connecting shaft 7 can rotate freely and slide up and down.

[0038] It should be noted that the above descriptions of orientation, such as "bottom," "top," "left," "right," "upper," and "lower," are all based on the orientation or positional relationship shown in the attached drawings, or the orientation or positional relationship commonly used when this utility model product is in use. They are only for ease of description and do not indicate or imply that the components involved must have a specific orientation, structure, or operation. In addition, for the sake of simplicity in the attached drawings, some structures or features such as holes, slots, and screws are not fully labeled. Although the reference numerals only point to one or a few of them, the descriptions represent all the same features.

[0039] The techniques not described in detail in this utility model are well-known in the art. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model in any way. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pin puller reset fixture, comprising three parts: a support assembly, a sliding assembly, and a force transmission assembly; the support assembly provides overall support and a fulcrum for the fixture; the sliding assembly is connected to the pin to be reset; the force transmission assembly transmits the force input by the operator to the sliding assembly, pulling the sliding assembly upward, thereby pulling out the pin and resetting the pin puller; characterized in that: The sliding assembly includes a sliding bolt (5), a bearing bolt (4), and a connecting shaft (7); the lower section of the sliding bolt (5) is a hollow cylindrical structure, and the upper section is a U-shaped groove for accommodating the head of the handle (1). The bottom of the U-shaped groove is provided with a through hole that communicates with the central hole of the lower section of the sliding bolt (5). The two ears of the U-shaped groove are provided with pin holes for installing the force transmission assembly; the bearing bolt (4) passes through the sliding bolt (5) and is connected to the connecting shaft (7). The lower end of the connecting shaft (7) is connected to the sliding pin. The support assembly includes a support frame (6) and a rotating shaft (3); the upper section of the support frame (6) is provided with a support frame rotating shaft hole for installing the rotating shaft (3) and a handle groove for accommodating the handle (1). Two support frame rotating shaft holes are provided through the front and rear directions, and the handle groove is provided through the left and right directions. The middle and lower sections of the support frame (6) are integrally formed as a longitudinally hollow cylindrical structure. The inner hole of the middle and lower sections is connected to the handle groove of the upper section. The middle section of the support frame (6) is also provided with a connecting shaft rotation groove for operating the connecting shaft (7) to rotate. The force transmission assembly includes two handles (1) on the left and right and a force transmission pin (2) connecting the heads of the two handles; one handle head is a U-shaped structure and the other head is a flat structure. Both the U-shaped structure and the flat structure are provided with pin holes for installing the force transmission pin (2). The flat structure is inserted into the U-shaped structure and is embedded in the U-shaped groove of the sliding bolt (5). The force transmission pin (2) passes through the pin hole of the sliding bolt (5) and the pin hole on the handle (1), thereby connecting the head of the handle (1) with the sliding bolt (5); the two handles (1) are also provided with handle pivot holes, the position of which corresponds to the pivot hole of the support frame, for inserting pivot (3), thereby providing a fulcrum for lever-type operation of the handle (1); During the reset operation, align the lower end of the support frame (6) with the retainer of the pin puller, rotate the connecting shaft (7) through the connecting shaft rotation groove, screw the threaded part of its lower end into the internal threaded hole at the top of the pin puller, and then apply downward pressure to the handles (1) on both sides. Through the lever action, the sliding assembly moves upward, thereby pulling the pin out of the retainer, and the pin puller reset is completed.

2. The pin-pulling device reset fixture as described in claim 1, characterized in that, The support assembly also includes a sliding bearing (8), which is installed inside the lower section of the support frame (6). The center hole of the sliding bearing (8) and the connecting shaft (7) are precisely matched to ensure that the free rotation and longitudinal sliding of the connecting shaft (7) do not interfere with each other.

3. The pin-pulling device reset fixture as described in claim 1 or 2, characterized in that, The sliding bolt (5) and the support frame (6) are in a hole-shaft sliding fit, and the sliding bolt (5) and the bearing bolt (4) are in a clearance fit. This ensures that the movement of the sliding assembly is always longitudinal, while preventing the connecting shaft (7) from transmitting torque to the sliding bolt (5) when it rotates.

4. The pin-pulling device reset fixture as described in claim 3, characterized in that, The connecting shaft (7) is a stepped shaft structure with a central hole with internal threads at the top for engaging with the bearing bolt (4) and an external thread at the bottom for screwing into the reset threaded hole of the sliding pin.

5. The pin-pulling device reset fixture as described in claim 3, characterized in that, The lower section of the support frame (6) is also provided with a groove for installing a retaining ring (9) to longitudinally limit the sliding bearing (8).

6. The pin-pulling device reset fixture as described in claim 3, characterized in that, The support frame (6) is also provided with a pin mounting hole. The hole is a threaded through hole with a diameter larger than that of the force transmission pin (2). It is used to insert the force transmission pin (2) through the hole during assembly, thereby connecting the handle (1) and the sliding bolt (5). After the force transmission pin (2) is installed, the pin mounting hole is sealed with a screw.

7. The pin-pulling device reset fixture as described in claim 6, characterized in that, The pin mounting holes are only located at the front or back of the support frame (6).

8. The pin-pulling device reset fixture as described in claim 3, characterized in that, The top of the support frame (6) is also provided with a set screw hole for screwing in a screw to press the rotating shaft (3) and prevent it from accidentally coming out.

9. The pin-pulling device reset fixture as described in claim 3, characterized in that, The pin hole on the handle (1) for connecting with the force transmission pin (2) is an oblong hole, which is easy to assemble and can avoid jamming caused by interference or uneven force on both sides of the handle during the reset operation.

10. The pin-pulling device reset fixture as described in claim 3, characterized in that, The lower section of the support frame (6) and the lower section of the connecting shaft (7) are both provided with external thread structures, which can be used to add extension sections or change the end shape to match different application scenarios and usage requirements.

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