CN2277854Y - Self-locking pliers - Google Patents

Abstract

The utility model relates to self-locking pliers which are commonly used in mechanical and electronic manufacture and repair work. The utility model is composed of a set of complete four-bar linkage mechanism. The utility model is characterized in that the opening degree of the jaw of the pliers can be adjusted by a telescopic component with positive and negative screw bolts and nuts so as to meet the different requirements of clamping different parts; a workpiece can be clamped continuously by applying initial grasping force when the utility model is used, and the workpiece can be released when a releasing handle is pressed. The utility model is characterized in that the adjusting parts are updated, the structure tends to be more perfect, and the operation can be done by one hand. The utility model has the advantages that the clamping force is large, the service life is long, the use is convenient and fast, etc.

Description

Self-locking pliers

The utility model relates to a kind of novel hand vice, in use workpiece can be clamped through suitable adjustment and after initially applying chucking power, and the pincers handle of need not firmly holding with a firm grip all the time, when need are decontroled workpiece, can press pine pincers handle, promptly decontrol workpiece, belong to a kind of hand tools that industries such as dynamo-electric manufacturing and maintenance are more generally used, its profile is seen Fig. 1.

Also there is similar pliers to come out at present.For example United States Patent (USP) 4546680, referring to Fig. 4, the utility model Self-locking pliers and they are in structure, adjust other part, there is basic difference aspects such as assembling mode, mainly show following several aspect: (1) as shown in Figure 1, the Self-locking pliers that the utility model proposes is by AB, BC, CDDA4 rod member passes through A, B, C, one group of perfect four-bar mechanism that four hinges of D are formed, wherein rod member CD is one group and has anti-(left side) respectively, just two bolts of (right side) screw thread overlap bolt assembly with one of corresponding tubular nut composition, rotate tubular nut wherein, can change the length of rod member CD, adjust the stretching degree of jaw with it, big to satisfy clamping, little (thick, thin) needs of different parts.And existing similar pliers is to adjust the jaw stretching degree by the length that changes rod piece A D, also is both adjustment rod member differences.(2) each pin joint of the four-bar mechanism that the utility model proposed all is to be made of complete hinge pin and pin-and-hole, and can guarantee has good assembled state and stress condition all the time, and existing similar pliers is not a perfect hinge being equivalent to the junction that D orders.As shown in Figure 4, it is that the hemispherical convex surface of adjustment bolt end at the D end place of concave surface of the D end by rod member CD and rod piece A D contacts and by the pulling force of spring, this D point is maintained at contact condition, in fact herein the contacted area in the end of two parts is very little, has only 2-4mm usually ²For keeping jaw that certain chucking power is arranged, also must bear suitable pressure at this D point, less because of its contact area, corresponding pressure and strain also obviously increase, the contact conditions that ordered by D herein restricts, this type of pliers is difficult to produce bigger chucking power, presses the pliers of the designed manufacturing of the utility model, is a complete hinge at this D point place, the pin-and-hole diameter is not less than 5mm, and the compression area that compares with it can reach 15-20mm ²Therefore bigger pressure can be born, also bigger chucking power can be produced.(3) also be because existing similar pliers is not a complete hinge at the D point, remove by means of an extension spring shown in Figure 4 herein, its two ends are held rod piece A B and AD respectively, and related pulling CD, make this D point be in the state that engages, lack enough constraints in addition, after it is subjected to some external force effect, non-assembled state shown in double dot dash line among Fig. 4 appears probably, AB rod member (lower jaw) must be made clockwise direction around the A point before use rotates, and the D of rod member CD end is inserted again in the groove of D end afterbody of rod member AD, making its combination again, can use.The pliers of making by the utility model because that four rod members all have at A, B, four nodes of C, D is good hinged, above-mentioned non-combined situation can not occur, has therefore also eliminated this cumbersome process that may occur.(4) can obviously see that with the contrast of Fig. 4 the adjustment part of two kinds of pliers and their rigging position are different with Fig. 1 by above narration, the Self-locking pliers that the utility model proposes, it adjusts part is to bear with a cover bolt assembly, be rod member CD, it is the centre position that is assemblied near whole pliers, can both gently hold pliers with the same hand during use, utilize the forefinger of this hand and the tubular nut at thumb wheel assembly middle part simultaneously, can adjust the stretching degree of jaw easily, reach best clamping effect, in actual use, this at a certain set-up procedure that part carried out that needs clamping, carry out repeatedly repeatedly possibly, therefore the Self-locking pliers of this one-hand operation has improved serviceability to a great extent, has improved operating efficiency, the adjustment bolt of at present similar pliers, all be the afterbody that is assemblied in rod piece A D, must hold pliers with one when using it, remove to rotate its adjustment bolt again with the another hand, also promptly be difficult to be unfavorable for raising the efficiency with one-handed performance.

The purpose of this utility model is considered at present similarly pliers above-mentioned some shortcomings part in use exactly, for improving the chucking power and the operating efficiency of pliers, handled easily, the new scheme that proposes at aspects such as structure and parts.

As Figure 1-3, the Self-locking pliers that the utility model proposes structurally is made up of one group of hinged perfect four-bar mechanism, its upper jaw 1 forms rod piece A D and extension thereof with upper plier handle 3, lower jaw 2 is rod piece A B and its extension, part 1 and part 2 are used for holding workpiece, adjust bolt assembly 6, form rod member CD, lower plier handle 4 forms rod member BC and its extension, together with upper plier handle 3, be used as the part that is held of pliers jointly, go up except that B is arranged at part 4 (CD), outside C two place's pin joints, at its middle part of extension, the hinged in addition lever that can swing 5, press its right-hand member, can make pliers decontrol the workpiece of clamping, part 7 springs are held lower jaw (AB), its effect is a pulling lower jaw when not clamping workpiece, it is often opened in the setting scope, easy to use, the self-locking action of pliers realizes by following principle, after at a certain workpiece adjustment that is held suitably, in the gripping, lower plier handle and apply suitable grip after, workpiece is clamped, at this moment rod member BC, the center line of CD forms straight line, also is B, C, 3 of D point-blank, this just can support rod piece A B, also be lower jaw 2, force it back not swing, also promptly with this understanding jaw can clamp (self-locking) workpiece all the time, in the time must unclamping workpiece, press the right-hand member of rod member 5 (pine pincers handle), make it to do swing clockwise around its fulcrum (pin joint), its left end promptly prizes rod member 6 (CD), force it to do the inhour swing around the C point, this has just destroyed B, C, 3 supporting conditions in line of D, simultaneously lower jaw 2 unclamps the workpiece of clamping under the pulling of spring 7.

By above explanation: the utility model as can be seen, the Self-locking pliers that is proposed, have use more convenient, can one-handed performance, chucking power is big, the life-span is long, advantages such as operating efficiency height.

Now in conjunction with the accompanying drawings Self-locking pliers and each part are further described, Fig. 1 is the installation diagram of standard type Self-locking pliers, ratio 1: 1, double dot dash line is represented among the figure be lower jaw may open up at utmost the time outline line and lower plier handle and adjust the corresponding position of bolt assembly, this moment, rod member CD length was the shortest, and part sequence number illustrated in fig. 1 is: 1, upper jaw: 2, lower jaw; 3, upper plier handle; 4, lower plier handle; 5, pine pincers handle; 6, adjust bolt assembly; 7, extension spring, its two ends are held part 2 and part 3 respectively.Part the 3,4, the 5th is the steel plate pressed part of 2-3mm (deciding on pliers specification size) by thickness, and part 1,2 is the medium carbon steel forging.Part 1 and part 3 constitute 1 rod member with the spot-welding technology assembly welding.Each hinge is all used φ 5 medium carbon steel pin riveteds, connecing little gap between pin-and-hole and the pin assembles movingly, guarantee that each rod member all can swing flexibly at pin joint, all major part 1-6 all does the surperficial antirust processing of electrogalvanizing or other technologies, and surperficial cure process is made at the position of upper and lower jaw contact workpiece.Part 6 bolt assemblies, be to constitute by three parts, its middle part is a tubular nut, anti-(left side) that inner surface at its two ends processes same diameter and pitch respectively be (right side) two kinds of spiral shell mosquitos just, and spinning anti-(left side) (right side) two bolts just of going into two same diameter and length respectively, its other end all has pin-and-hole, the assembling back forms rod member CD, forward after assembling is finished (or oppositely) rotates this tubular nut, the bolt at its two ends retrains because of being subjected to pin, can not make axially overhanging (or in contract) thereupon rotating, thereby change whole length component, reach the purpose of adjusting jaw size.Fig. 2 is for being positioned at hinge A, the cutaway view at B place, Fig. 3 is positioned at the cutaway view that D is ordered, Fig. 4 is the installation diagram of existing similar pliers, afterbody at these pincers is equivalent to the position that D is ordered, and cut-away view is made in the part, to show the contact situation at this place, double dot dash line is represented among Fig. 4 be such pliers after being subjected to some external force effect, the non-assembled state of correlated parts such as lower plier handle and continuous pine pincers handle thereof and upper plier handle formation.

Through above introduction, as can be seen, this novel Self-locking pliers except that the holding function that possesses general hand vice, has more the function of automatic clamping (self-locking) workpiece when adjustment is suitable, compare with existing similar pliers, series of advantages such as it is big that it has chucking power, easy to use, and the life-span is long, its produce and market will provide a kind of novel hand tools for China market.

The basic manufacturing process of this pliers is as above-mentioned, there is not special technical process, it is produced equipment and also only needs general equipment routinely, usually general medium and small hardware ﹠ tools producer all can organize production, and can be according to the needs of different industries and work post, with jaw make standard type or long chew type or the like, its specification also can be made large and small different model, be expected to promote faster at aspects such as produce and markets, be applied in the practice, its practical use is many-sided.

Claims (2)

1, a kind of Self-locking pliers is characterized in that: it is made up of (1) a perfect quadric chain, and it is perfect hinged also to be that each hinge is all done with pin, to be different from the perfect inadequately four-bar mechanism of existing similar products.(2) Self-locking pliers of the present utility model is to adjust jaw size with an adjustment bolt assembly that is assemblied in the pliers middle part, to replace the adjustment bolt that is positioned at the pliers afterbody of existing similar products.

2, Self-locking pliers according to claim 1 is characterized in that: the appearance profile of their associated jaw portion can be according to actual needs, make standard type or the long type of chewing.

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