CN112873078A - Multipurpose locking pliers - Google Patents
Multipurpose locking pliers Download PDFInfo
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- CN112873078A CN112873078A CN202110159729.3A CN202110159729A CN112873078A CN 112873078 A CN112873078 A CN 112873078A CN 202110159729 A CN202110159729 A CN 202110159729A CN 112873078 A CN112873078 A CN 112873078A
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- pliers
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- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 210000000080 chela (arthropods) Anatomy 0.000 claims 2
- 230000000694 effects Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 3
- 241001061225 Arcos Species 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B7/00—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
- B25B7/02—Jaws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B7/00—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
- B25B7/02—Jaws
- B25B7/04—Jaws adjustable
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
Abstract
The invention relates to a multipurpose locking pliers, which comprises a fixed pliers handle, a movable pliers handle, a small pliers plate connected with the fixed pliers handle and a large pliers plate connected with the movable pliers handle, wherein the free end of the large pliers plate is connected with a first pliers arm through a first connecting rod, the free end of the small pliers plate is connected with a second pliers arm through a second connecting rod, the two sides of the free ends of the large pliers plate and the small pliers plate wrap the large pliers plate and the small pliers plate through two clamping plates, a fine adjustment mechanism which is connected with the first pliers arm and the second pliers arm and has the same structure is arranged between the two clamping plates, the fine adjustment mechanism comprises a driving wheel and a tension wheel which are arranged between the two clamping plates and a driven wheel which is connected with the first pliers arm, and the driving wheel, the tension wheel and the driven wheel synchronously rotate through chains; the locking pliers provided by the invention can meet the requirement of adjusting the smaller distance between the first pliers arm and the second pliers arm through the fine adjustment structure, and the pliers heads with different specifications can be conveniently replaced through the positioning mechanism.
Description
Technical Field
The invention belongs to the technical field of hardware tools, and particularly relates to a multipurpose locking pliers.
Background
The locking pliers are mainly used for riveting, welding, grinding and other processing of clamping parts, and are characterized in that jaws can be locked and generate a large clamping force, so that the clamped parts cannot be loosened. When the locking pliers are opened, the self-locking structure is only needed to be released, and the pliers mouths of the locking pliers are opened under the action of the elastic pieces. The powerful pliers mainly use the lever principle, belong to the hand tool of lever reinforcement, its key of work is when the included angle of a set of ejector pins is great, can obtain several times of reinforcement from the decomposition of force. Compared with other hand tools utilizing the lever principle, the locking pliers apply the lever principle twice, so that labor is saved.
The size of an opening between jaws of a locking pliers in the prior art is mainly adjusted through a screw rod at the tail of the locking pliers, and the locking pliers are also adjustable in size by arranging a screw hole at the end of a presser foot to install an adjustable presser foot with the screw rod. Although the presser foot opening adjusting structure has no outstanding defect in adjusting the size of the opening, the adjustment of the tail screw rod and the adjustment of the presser foot screw rod are finished by screwing in and screwing out the screw rod, the rotation of the screw rod needs to consume a considerable time and cannot realize fine adjustment, and if the fine adjustment is required, the adjustment is realized by rotating the adjusting screw at the tail part of the fixed clamp handle, so the operation is complex, the number of parts and parts is large, the fine machining is needed, and the cost is high.
Disclosure of Invention
The present invention is to solve the problems of the background art, and an object of the present invention is to provide a multi-purpose locking pliers.
The purpose of the invention is realized as follows:
the multipurpose locking pliers comprise a fixed pliers handle and a movable pliers handle, and comprise a small pliers plate connected with the fixed pliers handle and a large pliers plate connected with the movable pliers handle, wherein the free end of the large pliers plate is connected with a first pliers arm through a first connecting rod, the free end of the small pliers plate is connected with a second pliers arm through a second connecting rod, the two sides of the free end of the large pliers plate and the free end of the small pliers plate wrap the large pliers plate and the small pliers plate through two clamping plates, a fine adjustment mechanism which is the same as the structure of the first pliers arm and the second pliers arm is arranged between the two clamping plates, the fine adjustment mechanism comprises a driving wheel and a tension wheel which are arranged between the two clamping plates, and a driven wheel connected with the first pliers arm, and the driving wheel, the tension wheel and the driven wheel rotate synchronously through a chain.
Preferably, the inner groove of the movable clamp handle is hinged with a release handle through a first pivot, the length of the movable clamp handle is greater than that of the release handle, a supporting block is connected between the release handle and the fixed clamp handle, one end of the supporting block is hinged with the middle part of the release handle through a second pivot, the other end of the supporting block is inserted into the inner groove of the fixed clamp handle, the tail end of the fixed clamp handle, which is far away from the small clamp plate, is screwed with an adjusting screw, one end of the adjusting screw, which is inside the fixed clamp handle, is connected with the other end of the supporting block, and the position of the supporting block in the inner groove of the fixed clamp handle is adjusted through the adjusting screw.
Preferably, the large clamp plate is connected with the fixed clamp handle through a rivet, and an elastic piece is further connected between the large clamp plate and the fixed clamp handle.
Preferably, the first tong arm and the second tong arm are wrapped at two sides of the center of the first tong arm and the second tong arm through fixing plates, the first tong arm and the fixing plates, and the second tong arm and the fixing plates are connected through third pivots, and the fixing plates are placed between the two clamping plates.
Preferably, the joints of the first connecting rod, the first tong arm, the large tong plate, the second connecting rod and the small tong plate are movably connected through a fourth pivot, and the driven wheel is sleeved on the outer periphery of the fourth pivot.
Preferably, the free ends of the first tong arm and the second tong arm are connected with a jaw through a positioning mechanism, the positioning mechanism comprises a steel ball plunger and a nut arranged at one end of the steel ball plunger, a pull ring is arranged on the nut in a penetrating mode, and a spring sleeve is sleeved on the periphery of the steel ball plunger.
Preferably, a handle for screwing is connected to the tension wheel.
Preferably, the clamping force F at the jaw satisfies:
F2=[2L0·cosψ·G·tan（α-β）]2+ G·{1+L0/[H·tan（β+ψ）+r]}2,
wherein L is0The distance (m) from the center of the clamped workpiece to the positioning mechanism of the jaw; h is the longitudinal central axis of the positioning mechanism of the jawDistance (m); beta is a friction angle; alpha is 1/2 of the included angle of the jaw; r is the radius (m) of a clamping circle formed by clamping the workpiece by the two jaws; psi represents the sag angle of the jaws when clamped, and psi is less than 4 °; g is the weight (kg) of the workpiece.
Preferably, when the workpiece is clamped by the jaws, the clamping acting force on the workpiece is transmitted to the jaws through the clamp arms to realize the function of clamping the workpiece, when a larger workpiece is clamped by the clamp arms and the jaws, the clamping force of the jaws on the workpiece is finally realized, when the same clamping device clamps different types of workpieces by the jaws and the clasping jaws, the effective clamping force output by the clamping mechanism is different, and the stable clamping force F on the workpiece isGSatisfies the following conditions:
FG=G(1+L2/L1) Mu, where G is the weight (kg) of the workpiece, mu is the static friction factor of the jaws with the workpiece, L2、L1The length (m) of the forceps arm and the forceps jaw respectively.
Preferably, the chain required tension W satisfies:
W=W1/4sin（α+β）+[（G+G0）cosβ/4μsin（α+β）]wherein W is1Reaction force of the work on the jaws, G0The weight (kg) of the jawarms and jaws.
Preferably, the included jaw angle α and the friction angle β satisfy:
α=arcos（R/R+R1+r0），β=arcsin[145/(R+R1)]；
wherein R is the radius of the driving wheel, R1Is the radius of the travelling wheel, r0The radius of the sprocket.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the multipurpose locking pliers provided by the invention, the movable handle can drive the distance between the first pliers arm and the second pliers arm on the locking pliers plate to correspond to each other, the requirement for adjusting the smaller distance between the first pliers arm and the second pliers arm can be met through the fine adjustment structure, and the pliers heads with different specifications can be conveniently replaced through the positioning mechanism.
2. According to the multipurpose locking pliers provided by the invention, the distance between the two corresponding pliers arms can be adjusted through screwing the direction of the driving wheel, and the multipurpose locking pliers can be quickly adjusted without rotating an adjusting screw rod when a small distance is adjusted.
Drawings
Fig. 1 is a schematic structural view of a multipurpose locking pliers of the present invention.
Figure 2 is a schematic view of a first and second jawarm of a multi-purpose locking pliers of the present invention.
FIG. 3 is a schematic view of the fine adjustment mechanism of the multipurpose locking pliers of the present invention.
FIG. 4 is a schematic view of a positioning mechanism of the multipurpose locking pliers of the present invention.
In the figure: 1. a movable clamp handle; 2. fixing the clamp handle; 3. removing the handle; 4. supporting; 5. adjusting the screw rod; 6. an elastic member; 7. a second pivot; 8. a first pivot; 9. a fifth hinge; 10. riveting; 11. a large nipper plate; 12. a small nipper plate; 13. clamping a plate; 14. a first clamp arm; 15. a second jawarm; 16. a jaw; 17. a fixing plate; 18. a first link; 19. a second link; 20. a fourth pivot; 21. a third pivot; 22. a driving wheel; 23. a tension wheel; 24. a driven wheel; 25. a chain; 26. a nut; 27. a pull ring; 28. a steel ball plunger; 29. and a spring sleeve.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
Example 1
Referring to fig. 1, the multipurpose locking pliers comprises a fixed pliers handle 2 and a movable pliers handle 1, wherein an inner groove of the movable pliers handle 1 is hinged with a release handle 3 through a first pivot 8, the length of the movable clamp handle 1 is greater than that of the release handle 3, a supporting block 4 is connected between the release handle 3 and the fixed clamp handle 2, one end of the supporting block 4 is connected with the middle part of the release handle 3 through a second pivot 7, the other end of the supporting block 4 is inserted into the inner groove of the fixed forceps handle 2, the tail end of the fixed clamp handle 2 far away from the small clamp plate 12 is screwed with an adjusting screw rod 5, one end of the adjusting screw rod 5 in the fixed clamp handle 2 is connected with the other end of the supporting block 4, the position of the supporting rod 4 in the groove of the fixed clamp handle 2 is adjusted through the adjusting screw rod 5, the large clamp plate 11 is connected with the fixed clamp handle 2 through the rivet 10, and the elastic piece 6 is connected between the large clamp plate 11 and the fixed clamp handle 2.
With reference to fig. 2, the pliers further comprise a small pliers plate 12 connected with the fixed pliers handle 2 and a large pliers plate 11 connected with the movable pliers handle 1, the movable pliers handle 1 is connected with the large pliers plate 11 through a fifth pivot 9, the free end of the large pliers plate 11 is connected with a first pliers arm 14 through a first connecting rod 18, the free end of the small pliers plate 12 is connected with a second pliers arm 15 through a second connecting rod 19, two sides of the free end of the large pliers plate 11 and the free end of the small pliers plate 12 wrap the large pliers plate 11 and the small pliers plate 12 through two clamping plates 13, two sides of the center of the first pliers arm 14 and the second pliers arm 15 wrap the first pliers arm 14 and the second pliers arm 15 through a fixing plate 17, the first pliers arm 14 is connected with the fixing plate 17, the second pliers arm 15 is connected with the fixing plate 17 through a third pivot 21, and the fixing plate 17 is placed between the two clamping plates 13.
A fine adjustment mechanism with the same structure as that of the first tong arm 14 and the second tong arm 15 is arranged between the two clamping plates 13, the fine adjustment mechanism comprises a driving wheel 22 and a tension wheel 23 which are arranged between the two clamping plates 13, and a driven wheel 24 connected with the first tong arm 14, the driving wheel 22, the tension wheel 23 and the driven wheel 24 synchronously rotate through a chain 25, the joints of the first connecting rod 18, the first tong arm 14, the large tong plate 11, the second connecting rod 19 and the second tong arm 15, the small tong plate 12 are movably connected through a fourth pivot 20, and the driven wheel 24 is sleeved on the outer periphery of the fourth pivot 20.
The adjusting screw rod 5 is screwed to a proper position, the movable clamp handle 1 is rotated around the fifth pivot button 9 and approaches to the fixed clamp handle 2, the movable clamp handle 1 and the fixed clamp handle 2 are opened, the movable clamp handle 1 pushes the supporting block 4 to rotate around the second pivot 7, the second pivot 7 moves from the waist-shaped hole to one end of the fixed clamp handle 2 and away from the fixed clamp handle 2, the labor-saving large-force clamp is in a self-locking clamping state at the moment, the large clamp plate 11 opens for a certain distance along with the fixed clamp handle 2 and the movable clamp handle 1 and the small clamp plate 12, a clamp arm and a clamp head connected with the large clamp plate 11 and the small clamp plate 12 open along with the pivot, after a workpiece is clamped, the movable clamp handle 1 is rotated, the movable clamp handle 1 and the fixed clamp handle 2 open, the movable clamp handle 1 opens under the action of the tension spring 6, and the movable clamp handle 1 also opens automatically, until the fifth pivot button 9 reaches one end of the waist-shaped hole close to the fixed plier handle 2, the opening angle of the movable plier handle 1 and the fixed plier handle 2 is the largest at the moment, a workpiece is clamped in the plier head 16, the corresponding driving wheel rotates forwards or reversely according to the clearance and the movement between the clamped workpiece and the plier head 16, and the plier arms on the same pivot with the driving wheel rotate along with the driving wheel, so that the size between the plier heads 16 is adjusted.
Referring to fig. 4, the free ends of the first and second arms 14 and 15 are connected to the jaw 16 through a positioning mechanism, the positioning mechanism includes a steel ball plunger 28 and a nut 26 disposed at one end of the steel ball plunger 28, a pull ring 27 is disposed on the nut 26 in a penetrating manner, a spring sleeve 29 is sleeved on the periphery of the steel ball plunger 28, the positioning mechanism is used to limit slipping of the binding clip, the length of the steel ball plunger is slightly greater than the thickness of the spring hole, the thickness of the arms and the jaw, so as to ensure that the jaw is pushed by enough displacement under the action of elastic force.
Example 2
Based on the embodiment 1, the material of the jaw and the clamp arm is ZG310-710, the material of the connecting rod is 45# steel, the material of the pivot and the rivet is 35CrMo, and the clamping force F at the jaw meets the following requirements: f2=[2L0·cosψ·G·tan（α-β）]2+ G·{1+L0/[H·tan（β+ψ）+r]}2Wherein L is0The distance (m) from the center of the clamped workpiece to the positioning mechanism of the jaw; h is the distance (m) from the positioning mechanism of the jaw to the longitudinal central axis; beta is a friction angle; alpha is 1/2 of the included angle of the jaw; r is the radius (m) of a clamping circle formed by clamping the workpiece by the two jaws; psi represents the sag angle of the jaws when clamped, and psi is less than 4 °; g is the weight (kg) of the workpiece.
When the workpiece quality is guaranteed, and the distance from the center of gravity of the workpiece to the jaw positioning mechanism is unchanged, and the center distance of the jaw positioning mechanism is increased, the minimum stable clamping force required for clamping the workpiece is reduced, and conversely, when the workpiece with the same load is clamped, the diameter of the clamping end of the workpiece is smaller, and the required minimum stable clamping force is larger.
When a workpiece is clamped by the jaw, the clamping acting force applied to the workpiece is transmitted to the jaw through the clamp arm to realize the function of clamping the workpiece, when a larger workpiece is clamped by the clamp arm and the jaw, the clamping force of the jaw to the workpiece is finally realized, when the same clamping device clamps different types of workpieces by the jaw and the clamp, the effective clamping force output by the clamping mechanism is different, and the stable clamping force F applied to the workpiece isGSatisfies the following conditions:
FG=G(1+L2/L1) Mu, where G is the weight (kg) of the workpiece, mu is the static friction factor of the jaws with the workpiece, L2、L1The length (m) of the forceps arm and the forceps jaw respectively.
The required tension W of the chain satisfies: w = W1/4sin（α+β）+[（G+G0）cosβ/4μsin（α+β）]Wherein W is1Reaction force of the work on the jaws, G0The weight (kg) of the jawarms and jaws.
Preferably, the included jaw angle α and the friction angle β satisfy:
α=arcos（R/R+R1+r0），β=arcsin[145/(R+R1)]；
wherein R is the radius of the driving wheel, R1Is the radius of the travelling wheel, r0The radius of the sprocket.
The required tension of the chain is increased along with the increase of the radius of the clamped workpiece, the tension allowance of the chain is reduced along with the increase of the radius of the clamped workpiece, the tension allowance of the chain is larger than 0, the condition of chain breakage is avoided, and the working requirement is met.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalents and substitutions made within the scope of the present invention should be included.
Claims (7)
1. The utility model provides a multipurpose locking pliers, includes fixed pincers handle (2) and activity pincers handle (1), its characterized in that: comprises a small clamp plate (12) connected with a fixed clamp handle (2) and a large clamp plate (11) connected with a movable clamp handle (1), the free end of the large nipper (11) is connected with a first nipper arm (14) through a first connecting rod (18), the free end of the small nipper (12) is connected with a second nipper arm (15) through a second connecting rod (19), the two sides of the free ends of the large nipper (11) and the small nipper (12) wrap the large nipper (11) and the small nipper (12) through the two clamping plates (13), a fine adjustment mechanism with the same structure as the first tong arm (14) and the second tong arm (15) is arranged between the two clamping plates (13), the fine adjustment mechanism comprises a driving wheel (22) arranged between the two clamping plates (13), a tension wheel (23) and a driven wheel (24) connected with the first tong arm (14), the driving wheel (22), the tension wheel (23) and the driven wheel (24) synchronously rotate through a chain (25).
2. A multi-purpose locking pliers according to claim 1 wherein: the internal groove of the movable clamp handle (1) is hinged with a release handle (3) through a first pivot (8), the length of the movable clamp handle (1) is greater than that of the release handle (3), a supporting gear (4) is connected between the release handle (3) and the fixed clamp handle (2), one end of the supporting gear (4) is connected with the middle part of the release handle (3) through a second pivot (7), the other end of the supporting gear (4) is inserted into the internal groove of the fixed clamp handle (2), the tail end of the fixed clamp handle (2) far away from a small clamp plate (12) is screwed with an adjusting screw (5), one end of the adjusting screw (5) inside the fixed clamp handle (2) is connected with the other end of the supporting gear (4), and the position of the supporting gear (4) in the internal groove of the fixed clamp handle (2) is adjusted through the adjusting screw (5).
3. A multi-purpose locking pliers according to claim 2 wherein: the large clamp plate (11) is connected with the fixed clamp handle (2) through a rivet (10), an elastic piece (6) is further connected between the large clamp plate (11) and the fixed clamp handle (2), and the movable clamp handle (1) is connected with the large clamp plate (11) through a fifth pivot (9).
4. A multi-purpose locking pliers according to claim 1 wherein: the two sides of the center of each of the first clamp arm (14) and the second clamp arm (15) wrap the first clamp arm (14) and the second clamp arm (15) through the fixing plate (17), the first clamp arm (14) is connected with the fixing plate (17) through the third pivot (21), the second clamp arm (15) is connected with the fixing plate (17), and the fixing plate (17) is placed between the two clamping plates (13).
5. A multi-purpose locking pliers according to claim 1 wherein: the first connecting rod (18), the first tong arm (14), the large tong plate (11), the second connecting rod (19), the second tong arm (15) and the small tong plate (12) are movably connected through a fourth pivot (20), and the driven wheel (24) is sleeved on the outer periphery of the fourth pivot (20).
6. A multi-purpose locking pliers according to claim 1 wherein: the free end of first tong arm (14) and second tong arm (15) all is connected with through positioning mechanism and keeps silent (16), positioning mechanism includes steel ball plunger (28) and locates nut (26) of steel ball plunger (28) one end, wear to be equipped with pull ring (27) on nut (26), the periphery cover of steel ball plunger (28) is equipped with spring housing (29).
7. A multi-purpose locking pliers according to claim 1 wherein: the tensioning wheel (23) is connected with a handle for screwing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110159729.3A CN112873078A (en) | 2021-02-05 | 2021-02-05 | Multipurpose locking pliers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110159729.3A CN112873078A (en) | 2021-02-05 | 2021-02-05 | Multipurpose locking pliers |
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| Publication Number | Publication Date |
|---|---|
| CN112873078A true CN112873078A (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110159729.3A Pending CN112873078A (en) | 2021-02-05 | 2021-02-05 | Multipurpose locking pliers |
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| Country | Link |
|---|---|
| CN (1) | CN112873078A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102873654A (en) * | 2011-07-12 | 2013-01-16 | 吴明杰 | Universal pliers |
| CN206010855U (en) * | 2016-09-21 | 2017-03-15 | 杭州巨星科技股份有限公司 | Locking pliers |
| CN111051004A (en) * | 2017-09-11 | 2020-04-21 | 米沃奇电动工具公司 | Locking pliers with movable torque-increasing jaw section |
-
2021
- 2021-02-05 CN CN202110159729.3A patent/CN112873078A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102873654A (en) * | 2011-07-12 | 2013-01-16 | 吴明杰 | Universal pliers |
| CN206010855U (en) * | 2016-09-21 | 2017-03-15 | 杭州巨星科技股份有限公司 | Locking pliers |
| CN111051004A (en) * | 2017-09-11 | 2020-04-21 | 米沃奇电动工具公司 | Locking pliers with movable torque-increasing jaw section |
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Application publication date: 20210601 |
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