CN116810030B

CN116810030B - Arc rack type labor-saving bolt clipper

Info

Publication number: CN116810030B
Application number: CN202310879361.7A
Authority: CN
Inventors: 王骞; 徐鹏; 邓基军; 于海洋
Original assignee: Weihai Liyu Industrial Co ltd
Current assignee: Weihai Liyu Industrial Co ltd
Priority date: 2023-07-18
Filing date: 2023-07-18
Publication date: 2025-11-11
Anticipated expiration: 2043-07-18
Also published as: CN116810030A

Abstract

This invention belongs to the technical field of manual hardware tools, specifically relating to an arc-shaped rack and pinion type labor-saving wire cutter. It replaces the direct bolt connection of the prior art with a movable gear pin and gear groove, allowing the gear pin to engage and move within the gear groove. The gear groove is arc-shaped, conforming to the movement trajectory of the wire cutter arm, resulting in smoother and more fluid operation. This invention features a compact and small structure, safe and convenient operation, low cost, simple processing and assembly, high production efficiency, and provides a sharp and quick cut with significant labor-saving effects.

Description

Arc rack type labor-saving bolt clipper

Technical Field

The invention belongs to the technical field of manual hardware tools, and particularly relates to an arc rack type labor-saving bolt clipper.

Background

Currently, the wire clippers on the market are generally composed of left and right blades, a cover plate, a fixing bolt, a nut, left and right connecting arms, a steel pipe, a handle and the like. The left blade and the right blade are connected together through two cover plates by bolt fastening, the left connecting arm and the right connecting arm are connected together through bolts, the left blade and the right blade are connected together through bolts, two steel pipes are respectively connected with the left connecting arm and the right connecting arm, and handles are respectively installed at the lower ends of the two steel pipes. When the cutting machine works, the two handle steel pipes and the left and right connecting arms are opened, the left and right blades are driven to be opened respectively, a workpiece to be cut is placed between the left and right blades, then the two handle steel pipes and the left and right connecting arms are closed, the left and right blades are driven to be closed, and the workpiece is cut. When the traditional bolt clipper shears a workpiece with high hardness or large diameter, a large shearing force is needed, and as two handle steel pipes and left and right connecting arms are opened, the opening angle is unchanged, and a power arm is unchanged, a larger force is needed to overcome the resistance of shearing the workpiece, and the long-time working strength is large, and time and labor are wasted.

Disclosure of Invention

Aiming at the problems, the invention provides the arc rack type labor-saving bolt clipper, which replaces the direct bolt connection in the prior art with the movably connected gear pin and the gear groove, so that the gear pin can move in the gear groove in a meshed manner, the gear groove is arc-shaped, and is attached to the movement track of the connecting arm of the bolt clipper, so that the bolt clipper is smoother to use. The invention has the advantages of compact and compact structure, safe and convenient use and operation, low cost, simple processing and assembly, high production efficiency, rapidness and sharpness and obvious labor-saving effect.

The scheme provided by the invention is as follows:

The utility model provides an arc rack type laborsaving wire cutting pliers, includes two blades of shape symmetry complex, and two blade middle part symmetry installs the clamp plate, and the left and right sides of clamp plate respectively with two blade swing joint still includes first linking arm and second linking arm, first linking arm front end and second linking arm front end respectively with two blade swing joint, first linking arm front end still is equipped with the gear groove, second linking arm front end is equipped with the gear pin, first linking arm passes through with the second linking arm gear groove and gear pin swing joint, the gear pin can be at the gear inslot cooperation removal.

The front ends of the first connecting arm and the second connecting arm are respectively connected with the two blades through pin shafts, and the two blades can respectively rotate around the first connecting arm/the second connecting arm. When the force is applied, the gear shaft is used as a fulcrum, the force applied on the first connecting arm/the second connecting arm is transmitted to the pin shaft connected with the tail end of the blade, then the force is transmitted to the knife edge at the top end of the blade by using the connecting pin shafts of the pressing plate and the blade as the fulcrum, and the force transmission is completed through the two-stage lever, so that the shearing action is completed.

The gear groove is in a circular arc shape, the circle center is a connection point of the first connecting arm and the blade, the circular arc-shaped gear groove can be more attached to the motion track of the first connecting arm, and in the opening and closing actions of the wire cutting pliers, the gear pin moves in the gear groove more smoothly, meanwhile, the arc shape is more convenient to punch and form materials in production.

Better, the circle in which the gear groove is located and the motion track of the first connecting arm in the opening/closing process are concentric circles, so that the gear groove can be completely attached to the motion track of the first connecting arm, resistance can not be generated due to the fact that the angle deviation exists between the gear groove and the motion direction of the first connecting arm in the opening/closing process, and the motion of the gear pin in the gear groove is smoother.

According to the invention, the gear pin and the gear groove which are movably connected replace direct bolt connection in the prior art, so that the gear pin can move in the gear groove in a meshing way, when the opening angle of the blade is maximum, namely, the separation angle of the first connecting arm and the second connecting arm is maximum, the gear pin moves to the farthest end of the gear groove, the force arm of a human hand when the force is applied is increased, and a larger moment is generated under the condition of applying the same force, so that the labor saving effect is realized. Meanwhile, due to the meshing of the gear pin and the gear groove, the gear pin can move in the gear groove in a meshing mode, so that in the shearing process, the force arm is continuously changed, the force application change of a human hand is more met, and when the blade is completely closed to complete shearing, the gear pin moves to the nearest end of the gear groove.

The gear pin is tightly matched with the rack, and the other side of the gear slot is free of the rack, so that movement is smoother, and resistance is reduced.

In the gear groove used by the invention, the number of teeth of the rack is 10-15, and the number of teeth of the gear pin is 10-15 correspondingly, so that the gear pin can move on the rack more smoothly, the setbacks are reduced, and when the opening angle of the first connecting arm and the second connecting arm is the largest, the angle between the first connecting arm and the second connecting arm is 160-170 degrees, the labor-saving effect is good, and the force application is convenient.

Preferably, the rear ends of the first connecting arm and the second connecting arm are connected with handles, so that the handles are convenient to grasp and apply force.

The labor-saving effect of the invention is analyzed by stress:

The traditional common bolt clipper is used as a contrast:

first level lever:

The tail of the wire cutting pliers is taken as a force input point, a pin shaft connected with a middle handle is taken as a fulcrum, a connecting shaft of the handle and a blade is taken as a force output point, the input force applied by the tail is Fa, the distance from the tail force application point to the middle pin shaft is taken as an input force arm La, the distance from the middle pin shaft to the blade and the connecting shaft of the handle is taken as an output force arm Lc, and the output force at the connecting shaft is Fc, so that:

the input torque Ma is ma=fa×la, the output torque Mc is mc=fc×lc,

Ma=Mc,

Fc=fa La/Lc;

second-stage lever:

the connecting shaft of the handle and the blade is used as a force input point, the connecting point of the blade and the pressing plate is used as a fulcrum, the top end of the blade is used as a force output point, the input force is Fe, the connecting point of the connecting shaft of the handle and the blade to the blade and the pressing plate is used as an input force arm Le, the output force is Fg, and the output force arm is Lg;

The included angle between the direction of the input force Fe and the direction of the output force Fc of the first-stage lever at the same position is alpha;

Then the first time period of the first time period, fe=fc=cosα=fa La cos alpha/Lc, input moment me=fe=le=

Fa*La*cosα*Le/Lc;

Output torque mg=fg,

Me=Mg, then

Output force fg=fa La cos a Le/Lc Lg,

Because La and Lc are fixed values, the whole force application process is the same, and no labor-saving effect is achieved.

The following is a stress analysis of the present invention:

first level lever:

the tail of the wire cutting pliers is taken as a force input point, a middle gear pin is taken as a fulcrum, a connecting shaft of a connecting arm and a blade is taken as a force output point, the input force of tail force application is Fb, the distance from the tail force application point to the middle gear pin is taken as an input force arm Lb, the distance from the middle connecting pin to the blade and a handle connecting shaft is taken as an output force arm Ld, and the output force at the connecting shaft is Fd, so that:

The input torque Mb is mb=fb×lb, the output torque Md is md=fd×ld,

Mb=Md,

Then the first time period of the first time period, fd=fb×lb/Ld;

second-stage lever:

the connecting shaft of the handle and the blade is used as a force input point, the connecting point of the blade and the pressing plate is used as a fulcrum, the top end of the blade is used as a force output point, the input force is Ff, the connecting point of the handle and the blade, the connecting point of the blade and the pressing plate is used as an input force arm Lf, the output force is Fh, and the output force arm is Lh;

The included angle between the direction of the input force Ff and the direction of the output force Fd of the first-stage lever at the same position is beta;

then the first time period of the first time period, ff=fd×cos β=fb La cos beta/Ld, input torque mf=ff =ff' lf=fb Lb cos β

*Lf/Ld;

Output torque mh=fh×lh,

Mf=mh, then

Output force fh=fb Lb cos β Lf/Ld Lh,

Because le=lf, lg=lh, are constant values, but Lb and Ld are continuously changed, and the rate of becoming smaller is greater than that of becoming smaller, the output force on the blade is greater, namely Fh > Fg, under the condition of the same input force, namely fb=fa, so that the labor-saving effect is achieved.

Compared with the prior art, the invention has the advantages that:

1. The structure is small and exquisite and compact, the use and operation are safe and convenient, the cost is low, the processing and the assembly are simple, the production efficiency is high, the speed is sharp, and the labor-saving effect is obvious.

2. The circular arc-shaped gear groove can be more attached to the movement track of the handle, and the gear pin moves in the gear groove more smoothly in the opening and closing actions of the bolt clipper.

3. The arc shape is more convenient for the stamping forming of materials in production, and the production cost is reduced.

Drawings

Fig. 1 is a schematic diagram of a prior art bolt clipper.

Fig. 2 is a schematic view of the structure of the present application (open state).

Fig. 3 is a schematic structural view (closed state) of the present application.

Fig. 4 is a schematic view of a first link structure.

Fig. 5 is a schematic view of a second arm structure.

Fig. 6 is a schematic view of a gear pin structure.

In the figure, 1, a blade, 2, a pressing plate, 3, a pin shaft, 4, a second connecting arm, 5, a handle, 6, a gear pin, 7, a gear groove, 8, a first connecting arm, 9, a limit screw, 10 and gear teeth.

Detailed Description

The invention is further illustrated by the following examples in connection with the accompanying drawings.

As shown in the figure, the arc rack type labor-saving wire cutting pliers comprise two blades 1 which are symmetrically matched, the tops of the blades 1 are knife edges, pressing plates 2 are symmetrically arranged in the middle of the two blades 1, and the left side and the right side of each pressing plate 2 are respectively connected with the two blades 1 by using a pin shaft 3 and a nut, so that the blades 1 can rotate around the pin shaft 3. The two pin shafts 3 are positioned on the same horizontal line, so that the pressing plate 2 is positioned in the horizontal direction, and the two blades 1 rotate around the pin shafts 3 to realize the opening and closing actions of the knife edge.

The tail ends of the two blades 1 are respectively connected with the outer sides of the top ends of the first connecting arm 8 and the second connecting arm 4 through the pin shafts 3, so that the blades 1 can rotate around the outer sides of the top ends of the first connecting arm 8 or the second connecting arm 4. The gear groove 7 is formed in the inner side of the top end of the first connecting arm 8, the gear groove 7 is an arc-shaped groove, the circle center is the connecting pin shaft 3 of the first connecting arm 8 and the corresponding blade 1, and when the first connecting arm 8 and the second connecting arm 4 are separated to the largest angle, the included angle between the first connecting arm 8 and the second connecting arm 4 is 170 degrees. The inner side of the gear groove 7 is provided with racks, the number of teeth is 13, and the outer side is not provided with teeth, so that the gear pin 6 can conveniently move.

The gear pin 6 is arranged on the inner side of the top end of the second connecting arm 4, the gear pin 6 is arranged inside the gear groove 7 in a meshed mode, one end of the gear pin 6 is provided with threads, and the first connecting arm 8 is connected with the second connecting arm 4 through a matched nut. The upper half circle of the gear pin 6 is provided with gear teeth 10 and the number of the gear teeth is 12, the gear teeth are meshed in the racks of the gear groove 7, and the lower half circle does not contain the gear teeth and is matched with the outer side of the gear groove 7. When the first and second link arms 8 and 4 are separated by the maximum angle, the gear pin 6 moves to the rightmost side of the gear groove 7, and when the first and second link arms 8 and 4 are closed to the minimum, the gear pin 6 moves to the leftmost side of the gear groove 7.

The limiting screw 9 is arranged on the inner side of the middle position of the second connecting arm 4, and when the first connecting arm 8 and the second connecting arm 4 are closed to the minimum, the limiting screw 9 contacts with the inner side of the first connecting arm 8 to limit, so that the blade is prevented from being damaged excessively.

The tail ends of the first connecting arm 8 and the second connecting arm 4 are connected with the rubber handle 5, so that the clamping and force application are facilitated.

The application method of the invention comprises the following steps:

In the unopened state, the first and second arms 8, 4 are closed to a minimum, at which point the knife edge is closed. When the bar shearing device is used, the first connecting arm 8 and the second connecting arm 4 are outwards rotated and opened to the maximum, the gear pin 6 moves from the left side to the right side of the gear groove 7, the knife edge is opened at the moment, bars can be placed into the knife edge, and the first connecting arm 8 and the second connecting arm 4 can be forcefully closed to shear. In the shearing process, the gear pin 6 gradually moves from the rightmost side to the leftmost side of the gear groove 7 along the rack, so that the labor-saving effect is realized, the labor-saving effect gradually changes, the force-applying rule of hands is met, and the use is smooth.

Claims

1. A rack-and-pinion type labor-saving wire cutter, comprising two symmetrically fitted blades, with a pressure plate symmetrically mounted in the middle of the two blades, the left and right sides of the pressure plate being movably connected to the two blades respectively, and further comprising a first connecting arm and a second connecting arm, the front ends of the first connecting arm and the second connecting arm being movably connected to the two blades respectively, the first connecting arm and the second connecting arm being rotatable around one end of the blades to complete the opening or closing action, characterized in that the front end of the first connecting arm is provided with a gear groove, and the front end of the second connecting arm is provided with a gear pin, the first connecting arm and the second connecting arm being movably connected to the gear pin through the gear groove, the gear pin being movable within the gear groove, the gear groove being arc-shaped, the center of the circle being the connection point between the first connecting arm and the blade; when the opening angle of the first connecting arm and the second connecting arm is at its maximum, the gear pin moves to one end of the gear groove, and when the closing angle of the first connecting arm and the second connecting arm is at its minimum, the gear pin moves to the other end of the gear groove; one side of the gear groove is a rack, and the other side is not a rack; the gear pin is tightly engaged with the rack.

2. The arc-shaped rack and pinion type labor-saving wire cutter according to claim 1, characterized in that the number of teeth of the rack matches the number of teeth of the gear pin.

3. The arc-shaped rack and pinion type labor-saving wire cutter according to claim 2, characterized in that the number of teeth of the rack is 10-15.

4. The arc-shaped rack and pinion type labor-saving wire cutter according to claim 1, characterized in that when the opening angle of the first connecting arm and the second connecting arm is at its maximum, the angle between the first connecting arm and the second connecting arm is 160°-170°.

5. The arc-shaped rack and pinion type labor-saving wire cutter according to any one of claims 1-4, characterized in that the circle in which the gear groove is located and the motion trajectory of the first connecting arm during the opening/closing process are concentric circles.

6. The arc-shaped rack and pinion type labor-saving wire cutter according to claim 1, characterized in that the front ends of the first connecting arm and the second connecting arm are respectively connected to two blades by pins, and the two blades can rotate around the first connecting arm/second connecting arm respectively.

7. The arc-shaped rack and pinion type labor-saving wire cutter according to claim 1, characterized in that the rear ends of the first connecting arm and the second connecting arm are both connected to handles.