Clamp head opening and closing structure of clip applier and continuous clip applier
By designing an "L"-shaped limiting structure and a lateral locking hole connection in the clamping forceps, the problem of easy dislodgement of the U-shaped retaining spring is solved, achieving stable opening and closing of the forceps head and ensuring safety in use, thus reducing the risk of medical accidents.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGZHOU CONDINER MEDICAL TECH
- Filing Date
- 2025-03-31
- Publication Date
- 2026-04-28
AI Technical Summary
The U-shaped retaining ring of the existing clamp is prone to falling off, which leads to unstable opening and closing of the clamp head and poses a risk of medical accidents.
The retaining ring limiting part is designed as an "L"-shaped limiting structure protruding from the side wall of the guide rail. The retaining ring connecting part is a retaining hole opened laterally at the tail of the pliers arm. The turning part of the U-shaped retaining ring is engaged with the "L"-shaped limiting structure, and the fastening part is inserted into the retaining hole to achieve a stable connection.
It effectively prevents the U-shaped retaining ring from falling off, improves the stability and safety of the forceps opening and closing, reduces the risk of medical accidents during surgery, and increases the connection strength of instrument components.
Smart Images
Figure CN224166362U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a medical clamp, and more specifically, to a clamp head opening and closing structure and a continuous clamp. Background Technology
[0002] A clamp is a commonly used medical device, usually used in surgical procedures in conjunction with a ligation clip to clamp blood vessels and achieve hemostasis.
[0003] Figures 1-1 to 1-5 The diagram shows a partial structure of a conventional clamp, in which a guide rail 2 for placing a ligation clip is located within the clamp bar 1. A pair of clamp head arms 3 are located at the front end of the guide rail 2, situated outside the clamp bar 1. The two clamp head arms 3 are positioned opposite each other and hinged to the guide rail 2. The opening and closing of the two clamp head arms 3 is controlled by the reciprocating motion of a transmission component within the clamp bar 1, controlled by an operating handle. To ensure stable closure of the two clamp head arms 3, a U-shaped retaining spring 4 is provided at the tail end of the clamp head arms 3. The structure of the U-shaped retaining spring 4 is as follows... Figure 1-5 As shown, the two retaining spring arms are connected by a bend 4-1 to maintain their elastically open state. Each retaining spring arm has a latching part 4-2 at its free end. The actual installation structure of the U-shaped retaining spring 4 can be referred to... Figure 1-1 and Figure 1-2 As shown, the turning part 4-1 of the U-shaped retaining ring 4 is limited by the retaining ring limiting part 2-1 on the guide rail 2. The tail of the clamp arm 3 has an extension part 3-2, and the extension part 3-2 has a retaining ring connecting part 3-3. The fastening part 4-2 of the U-shaped retaining ring 4 is connected to the corresponding retaining ring connecting part 3-3. Figure 1-3 With the clamp arm 3 open, the U-shaped retaining ring 4 is compressed and stores energy. Figure 1-4 When the pliers arm 3 is in the closed state, the U-shaped retaining ring 4 is released and opens outward, thus closing the pliers arm 3.
[0004] In the existing clamp structure described above, the retaining ring limiting part 2-1 is a limiting baffle formed by bending the side wall of the guide rail 2. It cannot restrict the lateral movement of the U-shaped retaining ring 4. The retaining ring connecting part 3-3 is a semi-circular notch located inside the extension part 3-2, allowing the U-shaped retaining ring 4 to have a large range of motion. The disadvantage of this structure is that after repeated activation, the U-shaped retaining ring 4 will gradually lose its rigidity and elasticity, and will be unable to support the extension part 3-2 of the clamp arm 3 to the fully closed state of the clamp head. At this time, the snap-fit part 4-2 of the U-shaped retaining ring 4 is prone to detaching from the retaining ring connecting part 3-3, resulting in an accident where the U-shaped retaining ring 4 falls off. In mild cases, this can cause the clamp head to fail to open and close normally, while in severe cases, the U-shaped retaining ring 4 may fall into the human body, causing a medical accident and incalculable losses to patients and hospitals. Summary of the Invention
[0005] 1. Technical problem to be solved by the utility model
[0006] The purpose of this invention is to overcome the shortcomings of existing clamps where the U-shaped retaining spring is prone to detachment. It provides a clamp head opening and closing structure and a continuous-fire clamp. The technical solution of this invention designs the retaining spring limiting part as an "L"-shaped limiting structure protruding from the side wall of the guide rail, effectively limiting the lateral movement of the U-shaped retaining spring's turning part. Simultaneously, the retaining spring connecting part is designed as a retaining hole laterally opened at the tail of the clamp head arm, achieving an effective connection between the U-shaped retaining spring and the clamp head arm. This effectively controls the relative displacement of the retaining spring during the use of continuous-fire clamps and ligation clips, solving the problem of easy detachment of the U-shaped retaining spring, reducing the risk of medical accidents during surgery, and avoiding unnecessary losses. Furthermore, the structural design is simple, easy to implement, improves the connection firmness of instrument components and the stability of clamp head opening and closing, and increases safety in use.
[0007] 2. Technical Solution
[0008] To achieve the above objectives, the technical solution provided by this utility model is as follows:
[0009] This utility model discloses a clamping pliers opening and closing structure, comprising a guide rail, a pair of clamping arms capable of opening and closing movement located at the far end of the guide rail, and a U-shaped retaining spring. The guide rail has a retaining spring limiting portion, and the tail end of each clamping arm has a retaining spring connecting portion. The turning portion of the U-shaped retaining spring is fixedly mounted on the aforementioned retaining spring limiting portion, and the snap-fit portions at both ends of the U-shaped retaining spring are respectively connected to the retaining spring connecting portions of the corresponding clamping arms.
[0010] The retaining spring limiting part is an "L"-shaped limiting structure protruding from the side wall of the guide rail. The turning part of the U-shaped retaining spring engages with the "L"-shaped limiting structure to restrict the lateral movement of the U-shaped retaining spring. The retaining spring connecting part is a retaining hole laterally opened at the tail of the pliers arm. The fastening part of the U-shaped retaining spring is inserted into the retaining hole of the corresponding pliers arm to realize the connection between the U-shaped retaining spring and the pliers arm.
[0011] Furthermore, the U-shaped retaining spring is made of steel wire with a circular cross-section bent, and the fastening part of the U-shaped retaining spring is a column foot formed by lateral bending.
[0012] Furthermore, the bend of the U-shaped retaining ring is either C-shaped or a torsion spring coil.
[0013] Furthermore, the proximal end of the pliers arm has a hinge portion, the pliers arm is rotatably mounted on the guide rail through the hinge portion, and the pliers arm extends from the hinge portion to the tail end with an extension portion, the snap ring connection portion being located at the tail end of the extension portion.
[0014] Furthermore, the hinge portion is a columnar protrusion located on the pliers arm and capable of being positioned within the hinge hole of the guide rail.
[0015] Furthermore, the retaining ring limiting part is formed by a secondary bending of the sheet metal protrusion on the guide rail.
[0016] This utility model discloses a series of continuous-fire clamps, including a clamp bar, a guide rail and a transmission assembly disposed within the clamp bar, an operating handle disposed at the near end of the clamp bar, and a pair of clamp head arms disposed at the far end of the clamp bar. The operating handle is driven and engaged with the clamp head arms through the transmission assembly to control the opening and closing movement of the clamp head arms. The clamp head arms are mounted at the far end of the clamp bar using the clamp head opening and closing structure of the above-mentioned clamps.
[0017] Furthermore, the operating handle includes a fixed handle, a movable handle, and a rotating head. The proximal end of the clamp bar is rotatably mounted on the fixed handle via the rotating head, and is used to change the clamping angle by rotating the rotating head. The movable handle is mounted on the fixed handle and cooperates with the transmission assembly to drive the transmission assembly to reciprocate within the clamp bar.
[0018] 3. Beneficial effects
[0019] Compared with existing known technologies, the technical solution provided by this utility model has the following beneficial effects:
[0020] (1) The present invention provides a clamping head opening and closing structure for a clamping pliers, comprising a guide rail, a pair of clamping head arms capable of opening and closing movement located at the far end of the guide rail, and a U-shaped retaining spring. The guide rail has a retaining spring limiting part, and the tail of the clamping head arm has a retaining spring connecting part. The turning part of the U-shaped retaining spring is limited and installed on the aforementioned retaining spring limiting part. The snap-fit parts at both ends of the U-shaped retaining spring are respectively connected to the retaining spring connecting parts of the corresponding clamping head arms. The retaining spring limiting part is an "L"-shaped limiting structure protruding from the side wall of the guide rail. The turning part of the U-shaped retaining spring engages with the "L"-shaped limiting structure to restrict the lateral movement of the U-shaped retaining spring. The retaining spring connecting part… The U-shaped retaining spring is inserted into the corresponding retaining hole at the tail of the clamp arm to connect it to the clamp arm. The retaining spring's limiting part is designed as an "L"-shaped limiting structure protruding from the side wall of the guide rail, effectively restricting the lateral movement of the U-shaped retaining spring's turning part. Simultaneously, the retaining spring's connecting part is designed as a retaining hole at the tail of the clamp arm, achieving an effective connection between the U-shaped retaining spring and the clamp arm. This solves the problem of the U-shaped retaining spring easily falling off, reduces the risk of medical accidents during surgery, and avoids unnecessary losses. Furthermore, the structural design is simple and easy to implement.
[0021] (2) The clamp head opening and closing structure of the clamping pliers of this utility model is made of a U-shaped retaining spring made of steel wire with a circular cross section bent. The fastening part of the U-shaped retaining spring is a column foot formed by lateral bending. Compared with the existing spring structure retaining spring, it greatly increases the service life and number of uses of the U-shaped retaining spring, and increases the rebound force of the U-shaped retaining spring. The turning part of the U-shaped retaining spring is a "C" shape or a torsion spring ring. The use of a torsion spring ring can further improve the elastic deformation performance and fatigue strength of the U-shaped retaining spring. In addition, after the U-shaped retaining spring is made of steel wire, the end of the retaining spring wire can be locked in the retaining hole at the tail of the clamp head arm, which increases the connection stability of the retaining spring.
[0022] (3) The clamp head opening and closing structure of the clamping pliers of the present invention has a hinge part at the proximal end of the clamp head arm. The clamp head arm is rotatably mounted on the guide rail through the hinge part. The clamp head arm extends from the hinge part to the tail end with an extension part. The snap ring connection part is located at the tail end of the extension part. By utilizing the lever principle of the extension part, the clamp head closing is more stable, and the snap ring exerts a greater closing force on the clamp head.
[0023] (4) The opening and closing structure of the clamp head of the present invention is a columnar protrusion provided on the clamp head arm and can be set in the hinge hole of the guide rail. The structure is simple and the clamp head rotates flexibly and stably. The retaining spring limiting part on the guide rail is formed by the secondary bending of the sheet metal protrusion on the guide rail. It is easy to manufacture and has good limiting reliability for the U-shaped retaining spring.
[0024] (5) A type of continuous-fire clamping pliers of this utility model includes a clamp bar, a guide rail and a transmission assembly disposed within the clamp bar, an operating handle disposed at the near end of the clamp bar, and a pair of clamp head arms disposed at the far end of the clamp bar. The operating handle is driven and cooperates with the clamp head arms through the transmission assembly to control the opening and closing movement of the clamp head arms. The clamp head arms are installed at the far end of the clamp bar using the clamp head opening and closing structure of the above-mentioned clamping pliers. This continuous-fire clamping pliers can solve problems such as unstable clamp head opening and closing, asynchronous opening and closing, and incomplete opening and closing, effectively preventing the U-shaped retaining spring from falling off and failing, and ensuring the safety and reliability of the continuous-fire clamping pliers. Attached Figure Description
[0025] Figure 1-1 A schematic diagram of the opening and closing structure of the jaws of an existing rapid-fire clamping pliers within the clamp bar;
[0026] Figure 1-2 A schematic diagram of the opening and closing structure of the jaws of an existing rapid-fire clamp;
[0027] Figure 1-3 This is a schematic diagram of the engagement state of the U-shaped retaining ring and the pliers head of an existing automatic fire-fighting clamp (pliers head open).
[0028] Figure 1-4 This is a schematic diagram showing the engagement state of the U-shaped retaining ring and the pliers head of an existing automatic fire-fighting clamp (pliers head closed).
[0029] Figure 1-5 This is a schematic diagram of the U-shaped retaining ring in an existing rapid-fire clamp;
[0030] Figure 2 This is a schematic diagram of the opening and closing structure of the clamp head of a clamping pliers in Embodiment 1 of this utility model, showing its state inside the clamp bar.
[0031] Figure 3 This is a front structural schematic diagram of the clamp head opening and closing structure of a clamping pliers according to Embodiment 1 of this utility model;
[0032] Figure 4 This is a side view of the opening and closing structure of the clamp head of a clamping pliers according to Embodiment 1 of this utility model.
[0033] Figure 5 This is a schematic diagram of the distal end structure of the guide rail in the clamp head opening and closing structure of a clamping pliers according to Embodiment 1 of this utility model.
[0034] Figure 6 This is a schematic diagram of the U-shaped retaining ring and the pliers head in Embodiment 1 of this utility model (pliers head open state);
[0035] Figure 7 This is a schematic diagram of the U-shaped retaining ring and the pliers head in Embodiment 1 of this utility model (pliers head closed).
[0036] Figure 8 This is a schematic diagram of the structure of the two clamp arms in this utility model (clamps closed);
[0037] Figure 9 This is a schematic diagram of the structure of the two clamp arms in this utility model (clamps open);
[0038] Figure 10 This is a schematic diagram of the U-shaped retaining spring in Embodiment 1 of this utility model (U-shaped retaining spring in open state);
[0039] Figure 11 This is a schematic diagram of the U-shaped retaining ring in Embodiment 1 of this utility model (U-shaped retaining ring in closed state);
[0040] Figure 12 This is a schematic diagram of the opening and closing structure of the clamp head of a clamping pliers in Embodiment 2 of this utility model, showing its state inside the clamp bar.
[0041] Figure 13 This is a schematic diagram of the U-shaped retaining ring and the pliers head in Embodiment 2 of this utility model (pliers head open state);
[0042] Figure 14 This is a schematic diagram of the U-shaped retaining ring and the pliers head in Embodiment 2 of this utility model (pliers head closed).
[0043] Figure 15This is a schematic diagram of the U-shaped retaining spring in Embodiment 2 of this utility model (U-shaped retaining spring in open state);
[0044] Figure 16 This is a schematic diagram of the U-shaped retaining ring in Embodiment 2 of this utility model (U-shaped retaining ring in closed state);
[0045] Figure 17 This is a schematic diagram of the continuous-fire clamp of this utility model.
[0046] Explanation of the labels in the diagram:
[0047] 1. Pliers bar; 2. Guide rail; 2-1. Snap ring limiting part; 3. Pliers head arm; 3-1. Hinge part; 3-2. Extension part; 3-3. Snap ring connecting part; 4. U-shaped snap ring; 4-1. Turning part; 4-2. Fastening part; 5. Fixed handle; 6. Movable handle; 7. Rotating head. Detailed Implementation
[0048] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.
[0049] [Example 1]
[0050] Combination Figures 2 to 11As shown, the clamping head opening and closing structure of this embodiment includes a guide rail 2, a pair of clamping head arms 3 capable of opening and closing movement located at the far end of the guide rail 2, and a U-shaped retaining spring 4. The guide rail 2 has a retaining spring limiting part 2-1, and the tail of the clamping head arm 3 has a retaining spring connecting part 3-3. The turning part 4-1 of the U-shaped retaining spring 4 is fixedly mounted on the aforementioned retaining spring limiting part 2-1. The fastening parts 4-2 at both ends of the U-shaped retaining spring 4 are respectively connected to the retaining spring connecting parts 3-3 of the corresponding clamping head arm 3. The U-shaped retaining spring 4 is constrained on the guide rail 2, and the two retaining spring arms of the U-shaped retaining spring 4 connect the two clamping head arms 3. The elasticity of the U-shaped retaining spring 4 is used to achieve the closing or opening of the clamping head arms 3. Unlike existing technologies, in this embodiment, the retaining spring limiting part 2-1 is an "L"-shaped limiting structure protruding from the side wall of the guide rail 2. The turning part 4-1 of the U-shaped retaining spring 4 engages with the "L"-shaped limiting structure to restrict the lateral movement of the U-shaped retaining spring 4. The retaining spring connecting part 3-3 is a locking hole laterally opened at the tail of the pliers arm 3. The fastening part 4-2 of the U-shaped retaining spring 4 is inserted into the corresponding locking hole of the pliers arm 3 to realize the connection between the U-shaped retaining spring 4 and the pliers arm 3. That is to say, in this embodiment, the retaining spring limiting part 2-1 is changed from the original vertical baffle structure to an "L"-shaped limiting structure, which can limit the turning part 4-1 of the U-shaped retaining spring 4 laterally on the guide rail 2. At the same time, the retaining spring connecting part 3-3 is changed from the original semi-circular notch to a locking hole, so that the connection between the U-shaped retaining spring 4 and the pliers arm 3 is tighter, which can prevent the U-shaped retaining spring 4 from separating from the pliers arm 3. By designing the retaining spring limiting part 2-1 as an "L"-shaped limiting structure protruding from the side wall of the guide rail 2, the lateral movement of the U-shaped retaining spring 4 turning part can be effectively restricted. At the same time, the retaining spring connecting part 3-3 is designed as a retaining hole opened laterally at the tail of the forceps arm, realizing the effective connection between the U-shaped retaining spring 4 and the forceps arm 3, solving the problem of the U-shaped retaining spring 4 being easy to fall off, reducing the risk of medical accidents during surgery, and avoiding unnecessary losses; moreover, the structural design is simple and easy to implement.
[0051] like Figure 10 and Figure 11 As shown, in this embodiment, the U-shaped retaining spring 4 is made of a steel wire with a circular cross-section, and the fastening part 4-2 of the U-shaped retaining spring 4 is a column formed by lateral bending. Compared with the existing spring-structured retaining spring, the lifespan and number of uses of the U-shaped retaining spring 4 are greatly increased, and the rebound force of the U-shaped retaining spring 4 is also increased. The turning part 4-1 of the U-shaped retaining spring 4 is "C" shaped, which allows the two elastic arms of the U-shaped retaining spring 4 to maintain an elastic expansion state, improving the elastic deformation performance of the U-shaped retaining spring 4. The "C" shaped turning part 4-1 can also be easily matched with the "L" shaped limiting structure mentioned above. In addition, the retaining hole at the tail of the pliers arm 3 is also a round hole with a diameter similar to that of the column, allowing the column to be inserted into the corresponding retaining hole. After the U-shaped retaining spring 4 is made of steel wire, the end of the retaining spring wire can be locked in the retaining hole at the tail of the pliers arm 3, which fits the retaining hole at the tail of the pliers arm 3 better and increases the stability of the retaining spring connection.
[0052] The different connection positions of the U-shaped retaining ring 4 and the pliers arm 3, as well as the natural state of the U-shaped retaining ring 4, determine whether the U-shaped retaining ring 4 closes or opens the pliers arm 3. For example... Figure 6 and Figure 7 As shown, in this embodiment, the proximal end of the pliers arm 3 has a hinge portion 3-1. The pliers arm 3 is rotatably mounted on the guide rail 2 via the hinge portion 3-1. An extension portion 3-2 extends from the hinge portion 3-1 to the tail end of the pliers arm 3. A retaining spring connection portion 3-3 is located at the tail end of the extension portion 3-2. Utilizing the lever principle of the extension portion 3-2, the pliers head closure is more stable, and the retaining spring exerts a greater closing force on the pliers head. The extension portion 3-2 and the main body of the pliers arm 3 have a certain angle, which determines the maximum opening angle of the two pliers arms 3. When the U-shaped retaining spring 4 is in its closed state, its function is to drive the pliers arm 3 to open; when the pliers arm 3 is closed, the U-shaped retaining spring 4 opens to store energy. Conversely, when the U-shaped retaining spring 4 is in its open state, its function is to drive the pliers arm 3 to close; when the pliers arm 3 is open, the U-shaped retaining spring 4 closes to store energy. The natural state of the U-shaped retaining spring 4—whether it is open or closed—depends on the transmission structure of the clamping pliers. In this embodiment, the function of the U-shaped retaining spring 4 is to drive the clamping head arm 3 to close, that is, the natural state of the U-shaped retaining spring 4 is the open state. More preferably, the aforementioned hinge portion 3-1 is a columnar protrusion provided on the clamping head arm 3 and capable of being disposed within the hinge hole of the guide rail 2, as shown in the reference... Figure 5 As shown, the hinge hole on the guide rail 2 is a round hole, and the pliers arm 3 is rotatably mounted in the hinge hole of the guide rail 2 through a columnar protrusion. The structure is simple and the pliers head rotates flexibly and stably.
[0053] like Figure 4 and Figure 5 As shown, in this embodiment, the retaining spring limiting part 2-1 is formed by a second bending of the sheet metal protrusion on the guide rail 2. That is, the protrusion is first bent 90° to the side and then bent 90° to the tail to form an "L"-shaped limiting structure. The horizontal stop edge of the second bending can effectively lock the turning part 4-1 of the U-shaped retaining spring 4, so that the U-shaped retaining spring 4 will not move laterally on the guide rail 2, thereby preventing the U-shaped retaining spring 4 from falling off the guide rail 2.
[0054] This embodiment also relates to a rapid-fire clamp. (Refer to...) Figure 17As shown, the rapid-fire clamp includes a clamp bar 1, a guide rail 2 and a transmission assembly located within the clamp bar 1, an operating handle located at the near end of the clamp bar 1, and a pair of clamp head arms 3 located at the far end of the clamp bar 1. The operating handle is driven by the transmission assembly and engages with the clamp head arms 3 to control the opening and closing movement of the clamp head arms 3. The clamp head arms 3 are mounted at the far end of the clamp bar 1 using the clamp head opening and closing structure described above. This rapid-fire clamp can solve problems such as unstable clamp head opening and closing, asynchronous opening and closing, and incomplete opening and closing, effectively preventing the U-shaped retaining spring from falling off and failing, thus ensuring the safety and reliability of the rapid-fire clamp.
[0055] Furthermore, the aforementioned operating handle includes a fixed handle 5, a movable handle 6, and a rotating head 7. The proximal end of the clamp bar 1 is rotatably mounted on the fixed handle 5 via the rotating head 7, which is used to change the clamping angle by rotating the rotating head 7. The movable handle 6 is mounted on the fixed handle 5 and cooperates with the transmission assembly to drive the transmission assembly to reciprocate within the clamp bar 1. During operation, by holding the fixed handle 5, the movable handle 6 can drive the clamp arm 3 to open and close. The movable handle 6 is connected to the clamp arm 3 via the transmission assembly, and the reciprocating movement of the transmission assembly can drive the clamp arm 3 to perform the corresponding action.
[0056] As for the transmission components inside the automatic firing clamp and the firing mechanism inside the operating handle, they are similar to existing clamps and are not improvements of this utility model, so they will not be described in detail here.
[0057] [Example 2]
[0058] The clamp head opening and closing structure and the continuously firing clamp of this embodiment are the same as those in Embodiment 1 in terms of basic structure and working principle, except that:
[0059] like Figures 12 to 16 As shown, in this embodiment, the turning part 4-1 of the U-shaped retaining ring 4 is a torsion spring coil, which is spirally arranged at least once. Due to space limitations, it is preferable to design the torsion spring coil to have 1-2 turns. The torsion spring coil can further improve the elastic deformation performance and fatigue strength of the U-shaped retaining ring 4, which is beneficial to improving the stability of the opening and closing movement of the pliers head. During installation, the torsion spring coil of the U-shaped retaining ring 4 can be fitted onto the "L"-shaped retaining ring limiting part 2-1, which is convenient for installation and provides stable limiting.
[0060] This utility model discloses a clamp head opening and closing structure and a continuous-fire clamp. The retaining spring limiting part is designed as an "L"-shaped limiting structure protruding from the side wall of the guide rail, which can effectively limit the lateral movement of the U-shaped retaining spring turning part. At the same time, the retaining spring connecting part is designed as a retaining hole laterally opened at the tail of the clamp head arm, realizing the effective connection between the U-shaped retaining spring and the clamp head arm. It can effectively control the relative displacement of the retaining spring during the use of continuous-fire clamps and ligation clips, solve the problem of easy dislodgement of the U-shaped retaining spring, reduce the risk of medical accidents during surgery, and avoid unnecessary losses. Moreover, the structural design is simple and easy to implement, improves the connection firmness of instrument components and the opening and closing stability of the clamp head, and increases the safety of use.
[0061] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.
Claims
1. A clamping head opening and closing structure, comprising a guide rail (2), a pair of clamping head arms (3) capable of opening and closing movement located at the far end of the guide rail (2), and a U-shaped retaining spring (4), wherein the guide rail (2) is provided with a retaining spring limiting part (2-1), the tail of the clamping head arm (3) is provided with a retaining spring connecting part (3-3), the turning part (4-1) of the U-shaped retaining spring (4) is limited and installed on the aforementioned retaining spring limiting part (2-1), and the fastening parts (4-2) at both ends of the U-shaped retaining spring (4) are respectively connected to the retaining spring connecting parts (3-3) of the corresponding clamping head arm (3); characterized in that: The retaining ring limiting part (2-1) is an "L"-shaped limiting structure protruding from the side wall of the guide rail (2). The turning part (4-1) of the U-shaped retaining ring (4) is engaged with the "L"-shaped limiting structure to restrict the lateral movement of the U-shaped retaining ring (4). The retaining ring connecting part (3-3) is a retaining hole laterally opened at the tail of the pliers arm (3). The fastening part (4-2) of the U-shaped retaining ring (4) is inserted into the corresponding retaining hole of the pliers arm (3) to realize the connection between the U-shaped retaining ring (4) and the pliers arm (3).
2. The clamp head opening and closing structure of the clamping pliers according to claim 1, characterized in that: The U-shaped retaining ring (4) is made of steel wire with a circular cross section bent, and the fastening part (4-2) of the U-shaped retaining ring (4) is a column foot formed by lateral bending.
3. The clamp head opening and closing structure of the clamping pliers according to claim 2, characterized in that: The bend (4-1) of the U-shaped retaining ring (4) is a "C" shape or a torsion spring coil.
4. The clamp head opening and closing structure of the clamping pliers according to claim 1, characterized in that: The proximal end of the pliers arm (3) has a hinge portion (3-1), and the pliers arm (3) is rotatably mounted on the guide rail (2) through the hinge portion (3-1). The pliers arm (3) extends from the hinge portion (3-1) to the tail end with an extension portion (3-2), and the snap ring connection portion (3-3) is provided at the tail end of the extension portion (3-2).
5. The clamp head opening and closing structure of the clamping pliers according to claim 4, characterized in that: The hinge part (3-1) is a columnar protrusion provided on the plier arm (3) and capable of being set in the hinge hole of the guide rail (2).
6. The clamp head opening and closing structure of the clamping pliers according to claim 1, characterized in that: The retaining ring limiting part (2-1) is formed by a secondary bending of the sheet metal protrusion on the guide rail (2).
7. A series of clamps, comprising a clamp bar (1), a guide rail (2) and a transmission assembly disposed within the clamp bar (1), an operating handle disposed at the proximal end of the clamp bar (1), and a pair of clamp head arms (3) disposed at the distal end of the clamp bar (1), wherein the operating handle is driven to engage with the clamp head arms (3) via the transmission assembly and is used to control the opening and closing movement of the clamp head arms (3), characterized in that: The clamp arm (3) is mounted at the far end of the clamp bar (1) using the clamp opening and closing structure of the clamping pliers as described in any one of claims 1 to 6.
8. The rapid-fire clamp according to claim 7, characterized in that: The operating handle includes a fixed handle (5), a movable handle (6), and a rotating head (7). The proximal end of the clamp bar (1) is rotatably mounted on the fixed handle (5) via the rotating head (7) for changing the clamping angle by rotating the rotating head (7). The movable handle (6) is mounted on the fixed handle (5) and cooperates with the transmission assembly for driving the transmission assembly to reciprocate within the clamp bar (1).