CN204843895U - Keep silent fast accent pincers of parallel translation - Google Patents

Keep silent fast accent pincers of parallel translation Download PDF

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Publication number
CN204843895U
CN204843895U CN201520655827.6U CN201520655827U CN204843895U CN 204843895 U CN204843895 U CN 204843895U CN 201520655827 U CN201520655827 U CN 201520655827U CN 204843895 U CN204843895 U CN 204843895U
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China
Prior art keywords
jaw
tong arm
wall surface
trough wall
gear tooth
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CN201520655827.6U
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Chinese (zh)
Inventor
徐华安
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Meridian International Co Ltd
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Meridian International Co Ltd
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Priority to CN201520655827.6U priority Critical patent/CN204843895U/en
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Abstract

The utility model provides a keep silent fast accent pincers of parallel translation, include: be equipped with the first tong arm of horizontal guide way and fore -and -aft holding tank, wherein, the holding tank link up the cell wall of guide way, the guide way has relative the first trough wall and second cell wall face, first tong arm still have with the parallel bearing area of the first trough wall, first keeping silent is fixed on the first tong arm, the second tong arm, with first tong arm pin joint, gear mechanism is injectd the second tong arm is in remove in the guide way, the second is kept silent, with the linkage of second tong arm includes: with the supporting of pressure -bearing facial features laminating lean on the face and in support and stretch into by the face the connecting portion of holding tank, the tip of connecting portion has set firmly the direction lug, the direction lug at least with the first trough wall is laminated mutually. The utility model discloses effectively solved and to have opened the angle and keeping silent of causing and wait to press from both sides the work piece and skid and throw off the problem owing to keep silent.

Description

The fast tune pincers that jaw moves in parallel
Technical field
The utility model relates to die workpiece field, particularly relates to the fast tune pincers that a kind of jaw moves in parallel.
Background technology
Water pump pliers is generally applicable to use, for clamping flat or cylindrical metal part when family is amateur meets an urgent need or simply install water pipe.In order to coordinate the part of difformity or size, need the size adjusting jaw.
Current water pump pliers by global formation, the first tong arm of comprising the first jaw and gathering sill, same global formation, the second tong arm of comprising the second jaw, and described second tong arm is limited to the restriction bolt of movement in gathering sill.This kind of water pump pliers relies on and limits bolt and pull open distance between the first jaw and the second jaw, to be stretched between jaw by part, then is clamped between two jaws by part by the chucking power of two tong arms.
Above-mentioned water pump pliers is when in Long-Time Service process, jaw opens different angles, and two jaws also change to the angle on opposite thereupon, along with the increase of angle, is easy to and waits to press from both sides workpiece and skid and throw off during work.Therefore, need to improve existing water pump pliers.
Utility model content
The fast tune pincers that the utility model embodiment provides a kind of jaw to move in parallel, for solving the jaw that causes due to jaw opening angle in prior art and waiting to press from both sides workpiece skidding disengagement problem.
Based on above-mentioned purpose, the fast tune pincers that the utility model provides a kind of jaw to move in parallel, comprise: the first tong arm being provided with horizontal gathering sill and longitudinal holding tank, wherein, the cell wall of the through described gathering sill of described holding tank, described gathering sill has the first relative trough wall surface and the second trough wall surface, and described first tong arm also has the pressure-bearing surface parallel with described first trough wall surface; First jaw, is fixed on described first tong arm; Second tong arm, with described first tong arm pivot joint; Gear mechanism, limits described second tong arm and moves in described gathering sill; Second jaw, links with described second tong arm, comprising: the abutment face fitted with described pressure-bearing surface and stretch into the connecting portion of described holding tank in described abutment face; Be installed with guiding projection in the end of described connecting portion, described guiding projection at least fits with described first trough wall surface.
Preferably, described second jaw is also provided with recess; The end of described second tong arm has shoulder projection, and described shoulder projection stretches into described recess; External force, by the protruding rotation in described recess of described shoulder, is passed to described second jaw by described second tong arm.
Preferably, the part in described guiding projection is fixed on the end of described connecting portion, non-standing part and the described connecting portion groove that to be formed with described guiding projection be cell wall, and described groove is used for stretching into described second tong arm.
Preferably, described guiding projection is bilateral guiding projection.
Preferably, at least one at least part of place in described first trough wall surface and the second trough wall surface, is provided with the gear tooth bar comprising the first gear tooth; Described second tong arm and the first tong arm are articulated by the pivot pin comprising the second gear tooth; Wherein, described first gear tooth and the second gear tooth match, and the described gear mechanism of common formation.
Preferably, described first trough wall surface and the second trough wall surface are equipped with described gear tooth bar.
Preferably, the length of described gear tooth bar and the length sum of described guiding projection are less than or equal to the length of described gathering sill.
Preferably, the toothed surfaces of described gear tooth bar belongs to place first trough wall surface or the second trough wall surface.
Preferably, described guiding projection is formed the second abutment face fitted with described first trough wall surface.
As mentioned above, the fast tune pincers that jaw of the present utility model moves in parallel, there is following beneficial effect: coordinated by the first abutment face pressure-bearing surface and the cooperation of guiding projection first trough wall surface, make the first jaw and the second jaw can realize moving in parallel (i.e. the stress surface keeping parallelism of the first jaw and the second jaw), can clamp better and wait to press from both sides workpiece.
In addition, by arranging the holding tank perpendicular to gathering sill, and the second jaw being stretched in gathering sill by holding tank, efficiently solving and causing jaw to be engaged the problem of easily threading off because gear mechanism wearing and tearing loosen; , guiding projection is arranged in gathering sill meanwhile, the whole fast compact conformation adjusting pincers can be made, aesthetic in appearance.
In addition, recess and shoulder projection is utilized to be flexibly connected the second jaw and the second tong arm, the pivotable of the second jaw along the second tong arm can be convenient to, achieve the fine setting between the second jaw and the first jaw, to compensate the offending problem of adjustment that gear facewidth degree in gathering sill brings.
In addition, the groove that described guiding projection is formed can limit the transverse shifting of the second tong arm further, prevents when tong arm is stressed, produces and laterally slides.
Further, utilize the gear tooth matched to carry out gear coarse adjustment, effectively can improve the tolerance of coarse adjustment position, prevent to slide; Meanwhile, gear tooth bar is processed into the cell wall of gathering sill at least partially, is convenient to one processing, reduces procedure of processing.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, be briefly described to the accompanying drawing used required in the description of the utility model embodiment below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the content of the utility model embodiment and these accompanying drawings.
Fig. 1 is the fast overall structure schematic diagram adjusting pincers that jaw of the present utility model moves in parallel.
Fig. 2 is the fast decomposition texture schematic diagram adjusting pincers that jaw of the present utility model moves in parallel.
Fig. 3 is the fast structural representation adjusting the first tong arm in pincers that jaw of the present utility model moves in parallel.
Fig. 4 is the fast structural representation adjusting the second jaw in pincers that jaw of the present utility model moves in parallel.
Fig. 5 is the fast structural representation adjusting the second tong arm in pincers that jaw of the present utility model moves in parallel.
Fig. 6 is the fast structural representation adjusting gear mechanism in pincers that jaw of the present utility model moves in parallel.
Fig. 7 is the structural representation of the fast tune clamp core pin that jaw of the present utility model moves in parallel.
Detailed description of the invention
The technical problem solved for making the utility model, the technical scheme of employing and the technique effect that reaches are clearly, be described in further detail below in conjunction with the technical scheme of accompanying drawing to the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those skilled in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
It should be noted that, the above-below direction in description refers to the above-below direction of accompanying drawing, and the fore-and-aft direction in description is the direction of vertical accompanying drawing, and the left and right directions of description is the left and right directions of accompanying drawing.
Refer to Fig. 1 and 2.The fast tune pincers that the utility model provides a kind of jaw to move in parallel.The jaw of described pliers as required, can carry out coarse adjustment and fine tuning to the distance between jaw.Described pliers comprises: the first tong arm 10, second tong arm 40, first jaw 20, second jaw 30 and gear mechanism 50.
Described first jaw 20 is fixed on described first tong arm 10 top.Described first jaw 20 can be integrally formed on described first tong arm 10; Also can be fixed on described first tong arm 10 by securing member is dismountable.Such as, described first jaw 20 is fixed on described first tong arm 10 by screw or holding firmware.
As shown in Figure 3, described first tong arm 10 is by the first in command 101, first support member 102 and second support member 103 integrally formed with the described first in command 101.Wherein, described first support member 102 is parallel relatively with the second support member 103.The top of described first support member 102 and the second support member 103 and described first jaw 20 global formation, to be fixed on described first jaw 20 between described first support member 102 and the second support member 103.
Longitudinal holding tank 105 is formed between described first support member 102 and the second support member 103.One gathering sill 104 perpendicular to described holding tank 105 direction and at least through described first support member 102 or the second support member 103 one of them; Preferably, described gathering sill 104 also can simultaneously through first support member 102 and the second support member 103.So, described first support member 102 and the second support member 103 form the first trough wall surface 106 of described gathering sill 104 near the madial wall of jaw, and described first support member 102 and the second support member 103 form the second trough wall surface 107 of described gathering sill 104 away from the madial wall of jaw.Described first trough wall surface 106 is relative with the second trough wall surface 107 and establish and parallel to each other.As seen from Figure 3, described holding tank 105 respectively by described first trough wall surface 106 and the second trough wall surface 107 entirety or part be divided into two sub-faces of cell wall (all non-label).
Described first tong arm 10 also has the pressure-bearing surface 108 parallel with described first trough wall surface 106, and described pressure-bearing surface 108 is generallyperpendicular with the stress surface of described first jaw 20.At this, described pressure-bearing surface 108 is the face that described first support member 102 and the second support member 103 and the second jaw 30 match.Described pressure-bearing surface 108 can be curved surface, so can prevent the sideslip of the second jaw 30, increases steadiness.For the ease of processing, described pressure-bearing surface 108 is plane.
As shown in Figure 4, described second jaw 30 comprises: the first abutment face 301 fitted with described pressure-bearing surface 108 and the connecting portion 302 stretching into described holding tank 105 inside described first abutment face.Wherein, the stress surface that described second jaw 30 is respective with the first jaw 20 is relative and establish.Described stress surface can be at least one in plane, toothed surfaces.Such as, the stress surface of described first jaw 20 and the second jaw 30 is toothed surfaces.And for example, the stress surface of described first jaw 20 is plane, and the stress surface of described second jaw 30 is toothed surfaces.
Wherein, described first abutment face 301 fits with the form in face, face with described pressure-bearing surface 108.If described pressure-bearing surface 108 is curved surface, then described first abutment face 301 is also curved surface.If described pressure-bearing surface 108 is plane, then described first abutment face 301 is plane.In order to improve the stability that power is transmitted, described first abutment face 301 is fitted on described pressure-bearing surface 108 with face, face form.In the present embodiment, described pressure-bearing surface 108 is two, and described first abutment face 301 correspondence is also two.
At this, the width of described connecting portion 302 is less than the width of described holding tank 105.Guiding projection 303 is had at the end winding support of described connecting portion 302.Described guiding projection 303 at least fits with described first trough wall surface 106.In order to increase lateral stressed area, described guiding projection 303 forms the second abutment face 305 fitted with described first trough wall surface 106.Described second abutment face 305 parallels with described first abutment face 301.
Wherein, described guiding projection 303 only can be fixed on the side of the end of described connecting portion 302; Preferably, described guiding projection 303 is fixed on the bilateral of the end of described connecting portion 302, and namely described guiding projection 303 is bilateral guiding projection.In addition, described guiding projection 303 is connected by the end winding support of securing member with described connecting portion 302.Or, the end global formation of described guiding projection 303 and described connecting portion 302.Wherein, described guiding projection 303 all can be fixed on the end of described connecting portion 302.Preferably, as shown in Figure 4, a part in described guiding projection 303 is fixed on the end of described connecting portion 302, non-standing part and described connecting portion 302 groove 306 that to be formed with described guiding projection 303 be cell wall, and described groove 306 is for stretching into described second tong arm 40.Described groove 306 can effectively prevent described second tong arm 40 movable to described guiding projection 303 direction when stressed, the dispersion of reduced force, moreover, by the design of this groove 306, when the second tong arm 40 stretch into described groove 306 work time, play the effect of increase by second jaw 30 job stability simultaneously.
Described second jaw 30 links with described second tong arm 40.Under the drive of gear mechanism 50, related second jaw 30 of described second tong arm 40 moves in the scope that gathering sill 104 limits, thus realizes the coarse adjustment of width between described second jaw 30 and the first jaw 20.Preferably, as shown in Figure 4, be provided with the recess 304 matched with described second tong arm 40 in the below of the connecting portion 302 of described second jaw 30, the width of described recess 304 is consistent with the width of described holding tank 105.So, guarantee that described first abutment face 301 can with described pressure-bearing surface 108 without staggered laminating.
As shown in Figure 5, described second tong arm 40 comprises: the second in command 401, extension 402 integrally formed with the described second in command 401.Described extension 402 extends to described second jaw 30 by described holding tank 105.The end of described extension 402 matches with described second jaw 30.
Preferably, the end of described extension 402 has shoulder projection 403.Described shoulder projection 403 stretches into described recess 304, and can rotate in recess 304.When the described second in command 401 by external force to the first in command 101 near time, described shoulder protruding 403, by rotating upper along mobile gradually to recess 304 of self contact position with described recess 304, drives described second jaw 30 near the first jaw 20 direction rotation thus.Thus, the fine setting of width between described second jaw 30 and the first jaw 20 is achieved.
The extension 402 of described second tong arm 40 owing to stretching out along described holding tank 105, therefore, the extension 402 of the second tong arm 40 and described first tong arm 10 pivot joint described in described gathering sill 104.
Particularly, the extension 402 of described second tong arm 40 is provided with through hole 404 at corresponding gathering sill 104 place.Described second tong arm 40 is limited in described gathering sill 104 through described through hole 404 and moves by pivot pin.Such as, described pivot pin comprises: the pin passing through hole 404 along gathering sill 104, and is positioned at the plug (not giving diagram) at described pin two ends.
In order to accurately regulate the width between described first jaw 20 and the second jaw 30, described second jaw 30 is allowed to be fixed on any position in gathering sill 104.Described second tong arm 40 is limited in described gathering sill 104 by gear mechanism 50 and moves.Described gear mechanism 50 and can replace the expansion button of a plug to form by the expander be sleeved on pin.When described expansion button is pressed, described expander is also full of the groove width space of described gathering sill 104, and described second tong arm 40 is limited in the corresponding position of gathering sill 104.
Preferably, as shown in Figure 6, described gear mechanism 50 the second gear tooth 502 of comprising the first gear tooth 501 and matching with described first gear tooth 501.
Wherein, described first gear tooth 501 side by side be arranged on gathering sill 104 cell wall side, to form gear tooth bar 503.Wherein, described gear tooth bar 503 to be located in described first trough wall surface 106 and the second trough wall surface 107 at least part of place of at least one.Particularly, described gear tooth bar 503 can be arranged on the sub-face of each cell wall of the first trough wall surface 106 and the second trough wall surface 107; Also the one or more of the sub-face of cell wall of described first trough wall surface 106 and/or the second trough wall surface 107 can be only arranged in.
Described gear tooth bar 503 can be sticked at least part of place of described gathering sill 104 cell wall according to above-mentioned arrangement; Also can be global formation with described gathering sill 104 cell wall, namely the toothed surfaces of described gear tooth bar 503 belongs to first trough wall surface 106 or second trough wall surface 107 at place.As shown in Figure 6, in the present embodiment, described first trough wall surface 106 and the second trough wall surface 107 all have two sub-faces of cell wall, and the sub-face of cell wall of each described first trough wall surface 106 and the second trough wall surface 107 is equipped with gear tooth bar 503.Preferably, the length of described gear tooth bar 503 and the length sum of described guiding projection 303 are less than or equal to the length of described gathering sill 104.
Described second gear tooth 502 is arranged on pivot pin.Particularly, as shown in Figure 7, described pivot pin comprises: pin 601; Be installed in the press section 602 of described pin 601 one end, described press section 602 is provided with at least one hole (not giving diagram) along described pin 601 direction; Be sleeved on the gear tooth external member on described pin 601, described gear tooth external member be provided with vertically the described second gear tooth 502 of at least one row; Be arranged on described holding tank 105 and be enclosed within described gear tooth external member protect tooth packing ring 604; Deformation-free placement in the hole and one end be positioned at described in protect spring 603 on tooth packing ring 604; Wherein, when described spring 603 is undeformed, described second gear tooth 502 is engaged with the first gear tooth 501; When described spring 603 pressurized deformation, described second gear tooth 502 is separated with described first gear tooth 501; And the plug 605 of corresponding described pin 601.
When described second gear tooth 502 be two rows above time, often arrange between described second gear tooth 502 and leave interval each other.
Composition graphs 1-7, the course of work of described pliers is as follows:
When described press section 602 and plug 605 cause spring 603 compressive deformation by longitudinal pressure force, described second gear tooth 502 departs from and the coordinating of described first gear tooth 501.Described first gear tooth 501 is in two intervals that ranked second between gear tooth.So, described first gear tooth 501 and the second gear tooth 502 staggered.
If while being subject to longitudinal pressure, laterally promote described press section 602 simultaneously, the second tong arm 40 and the second jaw 30 is driven to move in the scope that gathering sill 104 limits by pin 601, and by coordinating of the first abutment face 301 and described pressure-bearing surface 108 and coordinating of described guiding projection 303 and described first trough wall surface 106, the stress surface of the second jaw is by parallel with the stress surface of the first jaw for maintenance always.
When described pressure force and thrust all disappear, described spring 603 drives press section 602 resilience, described second gear tooth 502 is engaged the first new gear tooth 501, so have changed the distance between the second jaw 30 and the first jaw 20, achieves the coarse adjustment between the first jaw 20 and the second jaw 30.
When described second tong arm 40 and the stressed kneading of the first tong arm 10, described second tong arm 40 drives shoulder projection 403 to rotate in recess 304 and against edge on the inwall of recess 304, drives described second jaw 30 to move up, and forms fine setting.Described fine-tuning mode can solve by the restriction of gear facewidth degree and cause coarse adjustment to be beyond one's reach precision problem.
In sum, the fast tune pincers that jaw of the present utility model moves in parallel, coordinated by the first abutment face pressure-bearing surface and the cooperation of guiding projection first trough wall surface, make the first jaw and the second jaw can realize moving in parallel (i.e. the stress surface keeping parallelism of the first jaw and the second jaw), can clamp better and wait to press from both sides workpiece.So the utility model effectively overcomes shortcoming of the prior art and tool high industrial utilization., guiding projection is arranged in gathering sill meanwhile, the whole fast compact conformation adjusting pincers can be made, aesthetic in appearance.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any person skilled in the art scholar all without prejudice under spirit of the present utility model and category, can modify above-described embodiment or changes.Therefore, such as have in art and usually know that the knowledgeable modifies or changes not departing from all equivalences completed under the spirit and technological thought that the utility model discloses, must be contained by claim of the present utility model.

Claims (10)

1. the fast tune pincers that move in parallel of a jaw, is characterized in that, comprising:
Be provided with the first tong arm of horizontal gathering sill and longitudinal holding tank, wherein, the cell wall of the through described gathering sill of described holding tank, described gathering sill has the first relative trough wall surface and the second trough wall surface, and described first tong arm also has the pressure-bearing surface parallel with described first trough wall surface;
First jaw, is fixed on described first tong arm;
Second tong arm, with described first tong arm pivot joint;
Gear mechanism, limits described second tong arm and moves in described gathering sill;
Second jaw, links with described second tong arm, comprising: the first abutment face fitted with described pressure-bearing surface and stretch into the connecting portion of described holding tank in described first abutment face;
Be installed with guiding projection in the end of described connecting portion, described guiding projection at least fits with described first trough wall surface.
2. the fast tune that jaw as claimed in claim 1 moves in parallel clamps, and it is characterized in that, described second jaw is also provided with recess;
The end of described second tong arm has shoulder projection, and described shoulder projection stretches into described recess;
External force, by the protruding rotation in described recess of described shoulder, is passed to described second jaw by described second tong arm.
3. the fast tune that jaw as claimed in claim 1 moves in parallel clamps, it is characterized in that, a part in described guiding projection is fixed on the end of described connecting portion, non-standing part and the described connecting portion groove that to be formed with described guiding projection be cell wall, and described groove is used for stretching into described second tong arm.
4. the fast tune that jaw as claimed in claim 1 moves in parallel clamps, and it is characterized in that, described guiding projection is bilateral guiding projection.
5. the fast tune that jaw according to claim 1 moves in parallel clamps, and it is characterized in that, described pressure-bearing surface and the first abutment face are the plane fitted.
6. fast tunes that jaw as claimed in claim 1 moves in parallel clamps, and it is characterized in that, at least one at least part of place in described first trough wall surface and the second trough wall surface, is provided with the gear tooth bar comprising the first gear tooth;
Described second tong arm and the first tong arm are articulated by the pivot pin comprising the second gear tooth;
Wherein, described first gear tooth and the second gear tooth match, and the described gear mechanism of common formation.
7. the fast tune that jaw as claimed in claim 6 moves in parallel clamps, and it is characterized in that, described first trough wall surface and the second trough wall surface are equipped with described gear tooth bar.
8. the fast tune pincers that the jaw according to claim 6 or 7 moves in parallel, it is characterized in that, the length of described gear tooth bar and the length sum of described guiding projection are less than or equal to the length of described gathering sill.
9. the fast tune pincers that move in parallel of jaw as claimed in claims 6 or 7, it is characterized in that, the toothed surfaces of described gear tooth bar belongs to place first trough wall surface or the second trough wall surface.
10. the fast tune that jaw according to claim 1 moves in parallel clamps, and it is characterized in that, described guiding projection is formed the second abutment face fitted with described first trough wall surface.
CN201520655827.6U 2015-08-27 2015-08-27 Keep silent fast accent pincers of parallel translation Active CN204843895U (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106475922A (en) * 2015-08-27 2017-03-08 上海美瑞实业有限公司 The fast tune pincers that jaw is moved in parallel
TWI652150B (en) 2018-01-11 2019-03-01 伯鑫工具股份有限公司 Pipe wrench
EP3513909A1 (en) 2018-01-23 2019-07-24 Proxene Tools Co., Ltd. Pipe pliers
TWI670148B (en) * 2018-01-11 2019-09-01 伯鑫工具股份有限公司 Pipe Wrench
TWI670146B (en) * 2018-01-11 2019-09-01 伯鑫工具股份有限公司 Pipe Wrench
CN111434463A (en) * 2019-01-15 2020-07-21 伯鑫工具股份有限公司 Water pipe pliers
EP3689546A1 (en) 2019-01-31 2020-08-05 Proxene Tools Co., Ltd. Pipe wrench
US11141838B2 (en) 2019-02-05 2021-10-12 Proxene Tools Co., Ltd. Pipe wrench

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106475922A (en) * 2015-08-27 2017-03-08 上海美瑞实业有限公司 The fast tune pincers that jaw is moved in parallel
CN106475922B (en) * 2015-08-27 2019-01-15 上海美瑞实业有限公司 The fast tune pincers that jaw moves in parallel
TWI652150B (en) 2018-01-11 2019-03-01 伯鑫工具股份有限公司 Pipe wrench
TWI670148B (en) * 2018-01-11 2019-09-01 伯鑫工具股份有限公司 Pipe Wrench
TWI670146B (en) * 2018-01-11 2019-09-01 伯鑫工具股份有限公司 Pipe Wrench
EP3513909A1 (en) 2018-01-23 2019-07-24 Proxene Tools Co., Ltd. Pipe pliers
CN111434463A (en) * 2019-01-15 2020-07-21 伯鑫工具股份有限公司 Water pipe pliers
CN111434463B (en) * 2019-01-15 2021-10-22 伯鑫工具股份有限公司 Water pipe pliers
EP3689546A1 (en) 2019-01-31 2020-08-05 Proxene Tools Co., Ltd. Pipe wrench
US11141838B2 (en) 2019-02-05 2021-10-12 Proxene Tools Co., Ltd. Pipe wrench

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