Turnover labor-saving double-head pliers

Abstract

This utility model relates to a flip-type, labor-saving double-headed pliers, comprising two pairs of oppositely arranged jaws and a handle. Each pair of jaws includes a left jaw body, a right jaw body, and a hinge pin. The middle portions of the left and right jaw bodies extend towards each other to form a left hinge portion and a right hinge portion, respectively. The left and right hinge portions overlap each other and are hinged together by the hinge pin. The front ends of the two pairs of jaws face opposite directions. The ends of the left arms of both pairs of jaws are hinged together by a left pivot, and the ends of the right arms of both pairs of jaws are hinged together by a right pivot. The jaws are provided with a return spring for driving the jaws to open. The handle includes a left handle and a right handle. The front end of the left handle is hinged to the left pivot, and the front end of the right handle is hinged to the right pivot. The middle portions of the left and right handles abut against a pair of jaws. Using this pair of jaws as a fulcrum, the two pairs of jaws are driven to engage synchronously, forming a two-stage lever linkage to improve the labor-saving effect.

Description

Technical Field

[0001] This utility model belongs to the field of hardware tools, specifically relating to a flip-type labor-saving double-headed pliers. Background Technology

[0002] Pliers are widely used in production and daily life. With the specialization of processes, the types of pliers have gradually increased. In order to improve the ease of use of pliers and reduce the difficulty of carrying them, multi-head pliers have emerged. Multi-head pliers are divided into two main categories: interchangeable-head and non-interchangeable-head. Interchangeable-head pliers have detachable jaws and handles, while non-interchangeable-head pliers have at least two pairs of jaws. Different jaws can be used by changing the position or direction of the handle.

[0003] A type of non-replaceable multi-head pliers, disclosed in Chinese Patent Publication No. CN100503175C, is a typical example of a non-replaceable multi-head pliers. Currently, similar multi-head pliers include a novel type of double-head pliers disclosed in Chinese Patent Publication No. CN203843710U. Due to the limitations of their structural characteristics, these non-replaceable multi-head pliers do not have the effect of further saving effort and cannot compete with the single-head effort-saving pliers currently on the market in terms of effort saving. Therefore, their market acceptance has always been low. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a flip-type labor-saving double-headed pliers, which solves the technical problem that the current multi-headed pliers on the market, which cannot be replaced with different heads, cannot further improve the labor-saving effect due to structural limitations.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a flip-type labor-saving double-headed pliers, comprising two pairs of oppositely arranged pliers heads and a handle. Each pair of pliers heads includes a left plier body, a right plier body, and a hinge pin. The middle portions of the left and right pliers bodies extend towards each other to form a left hinge portion and a right hinge portion, respectively. The left and right hinge portions overlap each other and are hinged together by the hinge pin. The front and rear ends of the left pliers body are both located on the left side, and the front and rear ends of the right pliers body are both located on the right side. The left front jaw of the left pliers body and the right front jaw of the right pliers body face each other to form jaws. The left support arm at the rear of the left pliers body... When the right arm at the rear of the right jaws moves away from each other, the jaws narrow. The front ends of the two pairs of jaws face opposite directions. The ends of the left arms on the left side of both pairs of jaws are hinged to each other via a left pivot, and the ends of the right arms on the right side are hinged to each other via a right pivot. At least one pair of jaws is provided with a return spring to drive the jaws to open. A handle includes a left handle and a right handle. The front end of the left handle is hinged to the left pivot, and the front end of the right handle is hinged to the right pivot. The middle of the left and right handles abuts against a pair of jaws. Using this pair of jaws as a fulcrum, the two pairs of jaws are driven to engage synchronously.

[0006] As a preferred embodiment, at least one end of any hinge shaft extends axially outward to form a support post, and the left and right handles drive the two pairs of jaws to engage synchronously with the support post of the pair of jaws as the fulcrum.

[0007] As a preferred embodiment, each end of any hinge shaft extends outward to form a support column, consisting of a left clamp body and a right clamp body.

[0008] As a preferred embodiment, both the left and right handles have grooves on their opposing sides to accommodate part of the pliers head.

[0009] As a preferred embodiment, the left handle is formed by two opposing left plates connected together. The two left plates are respectively located on the front and rear sides of the left clamp body. The front ends of the two left plates are connected together by a hinge, and the middle and / or rear ends of the two left plates are connected together by a connecting pin. A groove is formed between the two left plates to accommodate part of the clamp head.

[0010] As a preferred embodiment, the right handle is formed by two right plates that are positioned opposite each other and connected together. The two right plates are respectively located on the front and rear sides of the right clamp body. The front ends of the two right plates are connected to each other by a hinge, and the middle and / or rear ends of the two right plates are connected to each other by a connecting pin. A groove is formed between the two right plates to accommodate part of the clamp head.

[0011] As a preferred embodiment, a pressure bar is provided on the left and right handles respectively. The two pressure bars correspond to the left and right front jaws of any pliers head. The left and right handles drive the two pairs of pliers heads to engage synchronously using the left and right front jaws of a pair of pliers heads as fulcrums.

[0012] As a preferred embodiment, the return spring is a coil spring coaxially disposed around the hinge shaft. The return spring is located between the overlapping left and right hinge portions. The left and right hinge portions are respectively provided with slots for engaging the return spring. One end of the return spring is connected to the left hinge portion and the other end is connected to the right hinge portion. The elastic potential energy of the return spring drives the left and right hinge portions to rotate relative to each other to open the jaws.

[0013] As a preferred embodiment, the return spring is a tension spring connected between the left and right arms of the same jaw. The elastic potential energy of the return spring drives the left and right arms to move closer together to open the jaws.

[0014] As a preferred embodiment, the pliers head is any one of wire cutter pliers head, needle-nose pliers head, diagonal pliers head, snap ring pliers head, sprue pliers head, nutcracker pliers head, wire stripper pliers head, wire crimping pliers head, and top cutter pliers head, wherein snap ring pliers head includes straight snap ring pliers head and bent snap ring pliers head.

[0015] The beneficial effects of this utility model are as follows: By setting the left front jaw and left support arm of the left clamp body on the left side and the right front jaw and right support arm of the right clamp body on the right side, and by using the left and right handles with a clamp head as a fulcrum to drive the left and right pivots away from each other, the jaws of the two clamp heads close synchronously, forming a primary lever with a clamp head as a fulcrum and the front and rear ends of the handle as the resistance arm and the power arm, respectively, and a secondary lever with the hinge as a fulcrum and the front and rear parts of the clamp body as the resistance arm and the power arm, respectively, the technical goal of improving the labor-saving effect of the double-headed clamps described in this utility model is achieved.

[0016] This invention further uses the support column formed by the axial extension of both ends of the hinge shaft as the fulcrum of the first-stage lever, which reduces the distance between the left and right handles. When the jaws are open, the front ends of the left and right handles are close to each other. Using the support column as the fulcrum can effectively reduce the opening angle of the rear of the left and right handles, thereby improving the user's grip comfort and making it suitable for users with small hands. Attached Figure Description

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is an exploded view of the double-headed pliers described in Example 1; Figure 2 This is a partial disassembly diagram of the double-headed pliers in the open state as described in Example 1; Figure 3 This is a diagram showing the closed state of the double-headed clamps described in Example 1; Figure 4 This is a simplified structural diagram of the double-headed pliers described in Example 1, which uses a different type of return spring. Figure 5 This is a schematic diagram of the action process of switching the pliers heads as described in Example 1; Figure 6 This is a schematic diagram of the double-headed pliers described in Example 1 using other types of pliers heads; Figure 7 This is a schematic diagram of the double-headed pliers described in Example 2; Figures 1-7 In the middle: 1. Left clamp body; 101. Left hinge; 102. Left front jaw; 103. Left support arm; 2. Right clamp body; 201. Right hinge; 202. Right front jaw; 203. Right support arm; 3. Hinge; 4. Jaw; 5. Left pivot; 6. Right pivot; 7. Return spring; 8. Left handle; 801. Left plate; 9. Right handle; 901. Right plate; 10. Support post; 11. Connecting pin; 12. Groove; 13. Slot; 14. Pressure bar. Detailed Implementation

[0018] The specific implementation scheme of this utility model will now be described in detail with reference to the accompanying drawings. Example 1

[0019] like Figure 1 and Figure 2 The flip-type, labor-saving double-headed pliers shown include two pairs of oppositely arranged jaws and a handle. Each pair of jaws includes a left jaw body 1, a right jaw body 2, and a hinge pin 3. The middle portions of the left jaw body 1 and the right jaw body 2 extend towards each other to form a left hinge portion 101 and a right hinge portion 201 that are axially offset along the hinge pin 3. The left hinge portion 101 and the right hinge portion 201 overlap each other and are hinged together by the hinge pin 3. The front and rear ends of the left jaw body 1 are both located on the left side, and the front and rear ends of the right jaw body 2 are both located on the right side. The left front jaw 102 of the left jaw body 1 and the right front jaw 202 of the right jaw body 2 are arranged opposite each other to form jaws 4. The left support arm 103 and the right support arm 103 at the rear of the left jaw body 1 are connected to the handle. When the right support arms 203 at the rear of the clamp body 2 move away from each other, the jaws 4 narrow. The front ends of the two pairs of clamp heads face opposite directions. The ends of the left support arms 103, which are located on the left side, are hinged to each other by the left pivot 5. The ends of the right support arms 203, which are located on the right side, are hinged to each other by the right pivot 6. In this embodiment, a pair of clamp heads is provided with a return spring 7 to drive the jaws 4 to open. A pair of handles includes a left handle 8 and a right handle 9. The front end of the left handle 8 is hinged to the left pivot 5, and the front end of the right handle 9 is hinged to the right pivot 6. The middle parts of the left handle 8 and the right handle 9 abut against a pair of clamp heads. Using this pair of clamp heads as a fulcrum, the two pairs of clamp heads are driven to bite synchronously.

[0020] In this embodiment, both ends of the hinge pins 3 on the two pairs of pliers extend axially outward from the left pliers 1 and the right pliers 2 respectively to form support pillars 10. The left handle 8 and the right handle 9 drive the two pairs of pliers to engage synchronously with the support pillars 10 of the pliers as fulcrums.

[0021] In practical applications, the hinge shaft 3 can also be equipped with a support column 10 at only one end.

[0022] In this embodiment, the support column 10 is cylindrical with an outer diameter larger than that of the hinge shaft 3. In practical applications, the rivet caps extending from the left clamp body 1 and the right clamp body 2 at both ends of the hinge shaft 3 can be used as the support column 10.

[0023] When the jaws 4 are open, the left pivot 5 and the right pivot 6 move closer together, which can cause the left handle 8 and the right handle 9 to interfere with the jaws below. To address this issue, in this embodiment, the left handle 8 is formed by two opposing left plates 801 connected together. The two left plates 801 are respectively located on the front and rear sides of the left jaw body 1, clamping the rear end of the left jaw body 1 in the middle. The front ends of the two left plates 801 are connected together by a hinge 3, and the middle parts of the two left plates 801 are connected together by a connecting pin 11. A groove 12 is formed between the two left plates 801 to accommodate part of the jaws. The right handle 9 is formed by two right plates 901 that are arranged opposite each other and connected to each other. The two right plates 901 are respectively arranged on the front and rear sides of the right clamp body 2, clamping the rear end of the right clamp body 2 in the middle. The front ends of the two right plates 901 are connected to each other through the hinge pin 3, and the middle and / or rear ends of the two right plates 901 are connected to each other through the connecting pin 11. A groove 12 is formed between the two right plates 901 to accommodate part of the clamp head.

[0024] In practical applications, the left handle 8 and the right handle 9 can also be solid structures, while the groove 12 can be formed directly on the side of the left handle 8 and the right handle 9 through hardware processing.

[0025] In this embodiment, the return spring 7 is a coiled spring, such as... Figure 1 As shown, the coil spring is coaxially arranged around the hinge shaft 3. The return spring 7 is located between the overlapping left hinge portion 101 and right hinge portion 201. The left hinge portion 101 and right hinge portion 201 are respectively provided with slots 13 for engaging the return spring 7. One end of the return spring 7 is connected to the left hinge portion 101 and the other end is connected to the right hinge portion 201. The elastic potential energy of the return spring 7 drives the left hinge portion 101 and right hinge portion 201 to rotate relative to each other to open the jaws 4.

[0026] The number of return springs 7 can be set as needed. Return springs 7 can be set on one pair of pliers or on both pairs of pliers.

[0027] In addition, as an alternative, such as Figure 4 As shown, a tension spring can also be used as the reset spring 7. The reset spring 7 is connected between the left arm 103 and the right arm 203 of the same jaw. The elastic potential energy of the reset spring 7 drives the left arm 103 and the right arm 203 to move closer to each other to open the jaws 4.

[0028] The flip-type, labor-saving double-headed pliers described in this embodiment have one straight-tip snap ring pliers head and one bent-tip snap ring pliers head. For example... Figure 6 As shown, in practical applications, pliers heads can also be wire cutter heads, needle-nose pliers heads, diagonal pliers heads, sprue pliers heads, nutcracker heads, wire stripper heads, wire crimping pliers heads, top cutter heads, etc.

[0029] The working process of this embodiment is as follows: Figures 1-5 As shown, the jaws 4 of the double-headed pliers remain open under the elastic potential energy of the return spring 7. The user can select the appropriate pliers head as needed. For example, if the user selects... Figure 1 With the upper jaw shown, swinging the left handle 8 and right handle 9 downwards, using the hinge pin 3 of the lower jaw as a fulcrum, drives the jaws 4 to narrow. After narrowing the jaws 4 to the appropriate size, the front ends of the left front jaw 102 and right front jaw 103 are inserted into the positioning holes at both ends of the retaining spring. Then, the user can release the left handle 8 and right handle 9, using the elastic potential energy of the return spring 7 to open the retaining spring, making it easier to attach the retaining spring to the target shaft. Then, squeeze the left handle 8 and right handle 9 again to narrow the jaws 4 until the jaws can separate from the retaining spring.

[0030] In this embodiment 1, during operation, the user does not need to exert force to open the retaining ring; instead, the return spring 7 opens it. This makes operation easier for the user, and the secondary lever effect further enhances the effort-saving effect. Although the user needs to overcome the elasticity of the return spring 7 when gripping the left handle 8 and right handle 9, this process is shorter than assembling the opened retaining ring onto the shaft head, thus eliminating the need for continuous force. Using the return spring 7 to open the retaining ring makes assembly easier and smoother. Conventional retaining ring pliers require continuous force to keep the retaining ring open while simultaneously installing it onto the shaft head, making assembly under pressure very difficult. The double-headed pliers described in this embodiment 1 effectively overcome this problem.

[0031] When the user needs to replace the pliers head, such as Figure 5 As shown, the left handle 8 and the right handle 9 can be swung upwards, and the lower pliers can be used by using the upper pliers head as a fulcrum. This switching method is also very convenient.

[0032] In this embodiment, the elastic force of the return spring 7 is adjusted according to actual usage requirements. When the jaws in this embodiment are not snap ring pliers, the return spring 7 typically requires only a small elastic force to open the jaws 4. Thus, when the user clamps or cuts the workpiece, only a small force is needed corresponding to the elastic force of the return spring 7. Only when snap ring pliers are used, due to the special working characteristics of snap ring pliers, is it necessary to increase the elastic force of the return spring 7 to utilize its elastic force to open the snap ring. Example 2

[0033] like Figure 7As shown, the structure of this embodiment is roughly the same as that of embodiment 1. The difference is that the left handle 8 and right handle 9 of the flip-type labor-saving double-headed pliers described in this embodiment drive the two pairs of pliers to bite synchronously with the left front jaw 102 and right front jaw 202 of a pair of pliers as fulcrums. Specifically, a pressure rod 14 is provided on the left pliers 8 and right pliers 9 respectively. The two pressure rods 14 correspond to the left front jaw 102 and right front jaw 202 of any pliers. When the left handle 8 and right handle 9 come together, the two pressure rods 14 press against the left front jaw 102 and right front jaw 202 of a pair of pliers respectively, directly squeezing the jaws 4 to shrink.

[0034] Compared with Example 1, although the structure of Example 2 can also achieve the effect of a two-stage lever, the ratio of the power arm to the resistance arm of the left handle 8 and the right handle 9 is smaller, resulting in a weaker effort-saving effect. Its effort-saving effect is not as good as that of Example 1.

[0035] The working process of this embodiment is the same as that of Embodiment 1, and the working process of Embodiment 1 can be referred to.

[0036] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some examples of its application, and are not intended to limit the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention.

Claims

1. A flip type labor saving double head pliers comprising two pairs of oppositely arranged plier heads and a pair of handles, characterized in that, Any pair of clamp heads includes a left clamp body (1), a right clamp body (2), and a hinge shaft (3). The middle parts of the left clamp body (1) and the right clamp body (2) extend towards each other to form a left hinge part (101) and a right hinge part (201), respectively. The left hinge part (101) and the right hinge part (201) overlap each other and are hinged by the hinge shaft (3). The front and rear ends of the left clamp body (1) are located on the left side, and the front and rear ends of the right clamp body (2) are located on the right side. The left front jaw (102) of the left clamp body (1) and the right front jaw (202) of the right clamp body (2) face each other to form a jaw (4). The left support arm (103) at the rear of the left clamp body (1) and the right support arm (203) at the rear of the right clamp body (2) are connected. When they move away from each other, the jaws (4) shrink, and the front ends of the two pairs of jaws face opposite directions. The ends of the left arm (103) on the left side of both pairs of jaws are hinged to each other by the left pivot (5), and the ends of the right arm (203) on the right side are hinged to each other by the right pivot (6). At least one pair of jaws is provided with a return spring (7) to drive the jaws (4) to open. A handle includes a left handle (8) and a right handle (9). The front end of the left handle (8) is hinged to the left pivot (5), and the front end of the right handle (9) is hinged to the right pivot (6). The middle of the left handle (8) and the right handle (9) abuts against a pair of jaws. With this pair of jaws as the fulcrum, the two pairs of jaws are driven to bite synchronously.

2. The flip action labor saving double ended forceps according to claim 1, wherein, At least one end of any hinge shaft (3) extends axially outward to form a support column (10), and the left handle (8) and the right handle (9) drive the two pairs of pliers to engage synchronously with the support column (10) of the pliers as the fulcrum.

3. The flip action labor saving double ended forceps according to claim 2, wherein, Both ends of any hinge shaft (3) extend outward from the left clamp body (1) and the right clamp body (2) to form a support column (10).

4. The flip action labor saving double ended forceps according to claim 3, wherein, The left handle (8) and the right handle (9) are both provided with grooves (12) on opposite sides to accommodate part of the pliers head.

5. The flip action labor saving double ended forceps according to claim 4, wherein, The left handle (8) is formed by connecting two opposing left plates (801). The two left plates (801) are respectively located on the front and rear sides of the left clamp body (1). The front ends of the two left plates (801) are connected to each other by a hinge (3). The middle and / or rear ends of the two left plates (801) are connected to each other by a connecting pin (11). A groove (12) is formed between the two left plates (801) to accommodate part of the clamp head.

6. The flip action labor saving double ended forceps according to claim 4, wherein, The right handle (9) is formed by two right plates (901) facing each other and connected to each other. The two right plates (901) are respectively located on the front and rear sides of the right clamp body (2). The front ends of the two right plates (901) are connected to each other by hinge pin (3). The middle and / or rear ends of the two right plates (901) are connected to each other by connecting pin (11). A groove (12) is formed between the two right plates (901) to accommodate part of the clamp head.

7. The flip action reduced force double ended forceps according to claim 1, wherein, A pressure bar (14) is provided on the left handle (8) and the right handle (9). The two pressure bars (14) correspond to the left front jaw (102) and the right front jaw (202) of any pliers head. The left handle (8) and the right handle (9) drive the two pairs of pliers heads to bite synchronously with the left front jaw (102) and the right front jaw (202) of a pair of pliers heads as fulcrums.

8. The flip action reduced force double ended forceps according to claim 1, wherein, The reset spring (7) is a coil spring, which is coaxially arranged around the hinge shaft (3). The reset spring (7) is located between the overlapping left hinge (101) and right hinge (201). The left hinge (101) and right hinge (201) are respectively provided with slots (13) for engaging the reset spring (7). One end of the reset spring (7) is connected to the left hinge (101), and the other end is connected to the right hinge (201). The elastic potential energy of the reset spring (7) drives the left hinge (101) and right hinge (201) to rotate relative to each other to open the jaws (4).

9. The flip action reduced force double ended forceps according to claim 1, wherein, The reset spring (7) is a tension spring. The reset spring (7) is connected between the left arm (103) and the right arm (203) of the same jaw. The elastic potential energy of the reset spring (7) drives the left arm (103) and the right arm (203) to move closer to each other to open the jaws (4).

10. The flip action force reducing double ended pliers of any one of claims 1-9, wherein, The pliers head is any one of the following: wire cutter head, needle-nose pliers head, diagonal pliers head, snap ring pliers head, sprue pliers head, nutcracker head, wire stripper head, wire crimping pliers head, and top cutter head. Among them, snap ring pliers head includes straight snap ring pliers head and bent snap ring pliers head.

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