CN101450471A

CN101450471A - Pipe wrench

Info

Publication number: CN101450471A
Application number: CNA2007101989374A
Authority: CN
Inventors: 游秋莹
Original assignee: MH Inc
Current assignee: MH Inc
Priority date: 2007-12-03
Filing date: 2007-12-03
Publication date: 2009-06-10

Abstract

The invention relates to a structure of pipe tongs. The pipe tongs comprise a handle and a movable clamping jaw, wherein the top surface of the handle is fixedly provided with an arc-shaped jaw block. The movable clamping jaw is pivoted at the top end of the handle and is made clamp and close relative to the arc-shaped jaw block of the handle through a torsion spring. The inner surface of the movable clamping jaw has a first tooth surface and a second tooth surface which are in opposite horizontal V shapes. The included angle between the first tooth surface and the second tooth surface is 135 degree. The included angles between an occlusion point of the first tooth surface of the movable clamping jaw and an occlusion point of the arc-shaped jaw block and the perpendicular dividing line of the center of a clamped object are between 160 and 170 degrees. The pipe tongs of the invention can prevent an circular object clamped from moving toward the opening between the movable clamping jaw and the arc-shaped jaw block, apply a major part of force on a circular surface perpendicular to the occlusion points, and generate larger friction forces on the occlusion points to prevent a pipe from deforming or sliding when the jaw block and the clamped object occlude.

Description

Pipe wrench

Technical field

The present invention is subordinate to the clamping technical field of a kind of circular pipe fitting or rod member, particularly is meant the pipe wrench that a kind of frictional force is high, uses the interlock chucking power of promoting the relative gripped object of pipe wrench.

Background technology

For circular pipe fitting of effective clamping or rod member, the industry exploitation has multiple pipe fitting tonger, as U.S. Pat version 2,559,973 and US 6,026, case before the patents such as 714, these pipe wrench consist predominantly of one handle, handle top tool is provided with the fixed jaw piece of the most tooth engaged of a tool, and but the handle top is pivoted with the live splint jaw of a relative fixed jaw piece clamping or separation in addition, and this live splint jaw also utilizes flexible member to make its pre-power of often possessing the clamping of relative fixed jaw piece, and this live splint jaw inner face also is formed with the most tooth engaged relative with fixed jaw piece tooth engaged, in aforesaid patent, the curved extension of plural tooth engaged of fixed jaw piece, the tooth engaged of live splint jaw inner face then forms the extended surface of two tool angles, forms at 3 for the tooth engaged of utilizing live splint jaw and fixed jaw piece and contacts the gripped object that clamps circle;

Aforementioned pipe wrench further and utilize being pivoted of live splint jaw, cooperate the different-diameter of gripped object to come opening and closing, but after the amplitude of oscillation of live splint jaw surpasses certain angle, it promptly can make the tooth engaged of live splint jaw and fixed jaw piece can't effectively be engaged in the side face of gripped object, the phenomenon that causes biting point frictional force to reduce, and then produce the phenomenon of skidding, and have influence on the effect that pipe wrench presss from both sides the gripped object of pulling, cause operational inconvenience of user and puzzlement.

And in order further to promote the frictional force and the clamping force of this class pipe wrench, industry further proposes many patents, solves aforesaid problem in the hope of seeing through different technology, as U.S. Pat 6,742, and 419, US 7,044,030 and US 7,096,764 etc.And with US6 wherein, 742,419 with US 7,044,030 is example, first and second flank of tooth of its live splint jaw can be along an axis relative fixed jaw piece around separation or close, it is one top that first and second flank of tooth of aforementioned live splint jaw and the tooth engaged of fixed jaw piece have, top and this live splint jaw axis of each tooth engaged staggers with the top of tooth engaged the preceding with angle R, this angle R is determined by formula R=TR*D1-D2/D3-D2, make it can effectively promote the frictional force of the gripped object that presss from both sides the multiple different-diameter of pulling, avoid the phenomenon of skidding.As for US 7,096, it is 115 degree that 764 order live splint jaw inboards are wherein arranged teeth V-shaped, and it also is to promote the pull interlock frictional force of gripped object of its folder, prevents that pipe wrench from skidding in operating process.

In other words, if can promote the frictional force of pipe wrench interlock gripped object, can strengthen its clamping force, when pipe wrench interlock gripped object was rotated, the reason pipe fitting was not out of shape and the phenomenon of generation slip, believes the economic worth that can improve pipe wrench.

In view of this, the inventor wishes that at the user demand that can further promote pipe wrench interlock frictional force deeply inquires into, and by the development Experience of being engaged in related industry for many years, actively seek solution, research through constantly making great efforts with study, finally success create a kind of pipe wrench, use the clamping force of effective enhancement pipe wrench, prevent the phenomenon that pipe wrench skids in operating process.

Summary of the invention

Therefore, main purpose of the present invention provides a kind of pipe wrench, to promote the frictional force of pipe wrench interlock gripped object, prevents slippage in the operating process.

For this reason, the present invention sees through following technological means, come specific implementation projects of the present invention and usefulness:

A kind of pipe wrench, handle with an elongated rod shape, at least one end utilizes pivot to be pivoted with a live splint jaw in the handle two ends, live splint jaw inner face has first flank of tooth and second flank of tooth that is relative ㄑ shape, and be formed with most tooth engaged on first and second flank of tooth respectively, the end lock of the corresponding live splint jaw of handle opening is provided with a camber jaw piece again, and the surface of this camber jaw piece is formed with most tooth engaged; The angle of the tooth engaged of its camber jaw piece is that 90 degree are to 92 degree, and the tooth engaged of first and second flank of tooth of live splint jaw is that 93 degree are to 97 degree, simultaneously the tooth top tangent line angle of the tooth engaged of first and second flank of tooth be 134 degree to 136 degree, and the tooth engaged of the tooth engaged of live splint jaw first flank of tooth interlock and the interlock of arc jaw piece to the angle of the angle of the vertical separated time of clamping object centers is that 160 degree are to 176 degree.

The pivot of handle is provided with a torque spring, and the outstanding protruding pin in these torque spring two ends stays on the relative inner face of handle and live splint jaw respectively, makes the automatic interlock of camber jaw piece of handle relatively of live splint jaw.

The angle angle of the tangent line of this camber jaw piece and clamping object contact point and this interlock tooth engaged flank of tooth is 37～45 degree.

The angle angle of the tangent line of live splint jaw second flank of tooth and clamping object contact point and this interlock tooth engaged flank of tooth is 45～60 degree.

The angle angle of the tangent line of live splint jaw first flank of tooth and clamping object contact point and this interlock tooth engaged flank of tooth is 40～55 degree.

By this, see through specifically representing of aforementioned techniques means of the present invention, make pipe wrench can utilize the special angle of live splint jaw to prevent that round gripped object is to the opening part slippage, and the most folder of order is pulled the component energy relatively on the biting point of circumferential surface perpendicular to live splint jaw second flank of tooth and arc jaw piece, and on the biting point, produce bigger frictional force, make arc jaw piece the time with the gripped object interlock, the reason pipe fitting is not out of shape and the phenomenon of generation slip, and can increase the surcharge of product, promote its competitiveness and economic benefit simultaneously.

For making your juror can further understand formation of the present invention, feature and other purpose; below be to lift some preferred embodiments of the present invention; and conjunction with figs. describes in detail as after; allow simultaneously and be familiar with this technical field person and can specifically implement, only the following stated person only is to illustrate preferred embodiment of the present invention; be not in order to limit the scope of the invention; so all have based on spirit of the present invention, and be any type of modification or change, all must belong to the category that the invention is intended to protect.

Description of drawings

Fig. 1 is the schematic appearance of pipe wrench of the present invention;

Fig. 2 is the local enlarged diagram of pipe wrench of the present invention;

Fig. 3 is that the plane of pipe wrench of the present invention indicates schematic diagram.

The main element symbol description

10 handles, 12 pivots, 13 torque springs

15 camber jaw pieces, 150 tooth engaged, 20 live splint jaws

21 first flank of tooth, 210 tooth engaged, 22 second flank of tooth

220 tooth engaged

The specific embodiment

The present invention is a kind of pipe wrench of gripped objects such as circular pipe fitting or rod member of pulling that is used to press from both sides, as shown in Figure 1, pipe wrench of the present invention has the handle 10 of an elongated rod shape, at least one end utilizes pivot 12 to be pivoted with a live splint jaw 20 in handle 10 two ends, and the end of handle 10 corresponding live splint jaw 20 openings lock is provided with a camber jaw piece 15;

And about the detailed description of characterization step of the present invention, then please cooperate simultaneously referring to Fig. 1, Fig. 2, shown in Figure 3, pipe wrench is provided with a torque spring 13 in the pivot 12 of 10 on live splint jaw 20 and handle, the outstanding protruding pin in these torque spring 13 two ends stays on the relative inner face of handle 10 and live splint jaw 20 respectively, make the live splint jaw 20 camber jaw piece 15 automatic interlocks of handle 10 relatively, moreover the camber surface of camber jaw piece 15 is formed with most tooth engaged 150, and aforementioned live splint jaw 20 inner faces have first flank of tooth 21 and second flank of tooth 22 that is relative ㄑ shape, and first, two flank of tooth 21, be formed with most tooth engaged 210 on 22 respectively, 220;

Moreover the angle D of camber jaw piece 15 each tooth engaged 150 is 90 degree+2 degree, and each tooth engaged 210,220 of live splint jaw 20 first and second flank of

tooth

21,22 is 95 degree ± 2 degree, the tooth top tangent line of the tooth engaged 210,220 of first and second flank of

tooth

21,22 is made as L1, L2 (not shown) simultaneously, and the tooth top tangent line L1 of this first and second flank of

tooth

21,22 and the angle of L2 are 135 degree ± 1 degree, moreover when camber jaw piece 15 and live splint jaw 20 first and second flank of

tooth

21,22 during in the interlock gripping objects, the tangent line of its relative tooth engaged 150,210,220 is made as L3, L4, L5; And the tooth engaged 210[contact point P3 of live splint jaw 20 first flank of tooth 21 interlocks] and the tooth engaged 150[contact point P1 of arc jaw piece 15 interlocks] to the angle of the angle G of the vertical separated time of clamping object centers be 160～176 degree; The angle of the included angle A of the tangent line of camber jaw piece 15 and clamping object contact point and these interlock tooth engaged 150 flank of tooth is 37～45 degree again; The angle of the included angle B of the tangent line of live splint jaw 20 second flank of tooth 22 and clamping object contact point and these interlock tooth engaged 220 flank of tooth is 45～60 degree in addition; And the angle of the angle E of the tangent line of live splint jaw 20 first flank of tooth 21 and clamping object contact point and these interlock tooth engaged 210 flank of tooth is 40～55 degree;

By this, group constitutes the strong and unlikely pipe wrench person of skidding arbitrarily of a clamping force.

See through aforesaid design and explanation, the present invention has following advantage and practical value when practice; Such as:

1, pipe wrench of the present invention can prevent that round clamping object breaks away to the opening part of live splint jaw 20 with arc jaw piece 15, allow most component at the tooth engaged 210[contact point P1 of circular surfaces perpendicular to live splint jaw 20 first flank of tooth 21] with the tooth engaged 150[contact point P3 of camber jaw piece 15] on FP1 and FP2 component, on aforesaid contact point P1 and contact point P3, produce bigger frictional force, to promote its clamping force.

2, pipe wrench of the present invention is simultaneously owing to the angle of camber jaw piece 15 each tooth engaged 150 with the tooth engaged 210,220 of live splint jaw 20 designs for the obtuse angle, it can increase the intensity of tooth engaged 150,210,220, so the angle of relative angle A will be controlled at 37～45 degree relatively, can prevent camber jaw piece 15 with circular clamping object interlock the time, the distortion of reason pipe fitting produces the phenomenon of sliding.

In sum, the present invention has above-mentioned numerous practical value, therefore the present invention is a novel progressive creation really, in identical technical field, do not see identical or approximate product public use, so the present invention has met the important document of patent of invention, be to file an application in accordance with the law, request and grant accurate this case patent of invention early.

Claims

1, a kind of pipe wrench is characterized in that: have the handle of an elongated rod shape, at least one end utilizes pivot to be pivoted with a live splint jaw in the handle two ends, and live splint jaw inner face has and is relative

First flank of tooth of shape and second flank of tooth, and be formed with most tooth engaged on first and second flank of tooth respectively, the end lock of the corresponding live splint jaw of handle opening is provided with a camber jaw piece again, and the surface of this camber jaw piece is formed with most tooth engaged; Wherein:

The angle of the tooth engaged of camber jaw piece is that 90 degree are to 92 degree, and the angle of the tooth engaged of first and second flank of tooth of live splint jaw is that 93 degree are to 97 degree, simultaneously the tooth top tangent line angle of the tooth engaged of first and second flank of tooth be 134 degree to 136 degree, and the tooth engaged of the tooth engaged of live splint jaw first flank of tooth interlock and the interlock of arc jaw piece to the angle of the angle of the vertical separated time of clamping object centers is that 160 degree are to 176 degree.

2, pipe wrench as claimed in claim 1, it is characterized in that: the pivot of handle is provided with a torque spring, the outstanding protruding pin in these torque spring two ends stays on the relative inner face of handle and live splint jaw respectively, makes the automatic interlock of camber jaw piece of handle relatively of live splint jaw.

3, pipe wrench as claimed in claim 1 is characterized in that: the tangent line of this camber jaw piece and clamping object contact point and the angle angle of this interlock tooth engaged flank of tooth are 37～45 degree.

4, pipe wrench as claimed in claim 1 is characterized in that: the tangent line of live splint jaw second flank of tooth and clamping object contact point and the angle angle of this interlock tooth engaged flank of tooth are 45～60 degree.

5, pipe wrench as claimed in claim 1 is characterized in that: the tangent line of live splint jaw first flank of tooth and clamping object contact point and the angle angle of this interlock tooth engaged flank of tooth are 40～55 degree.