WO2012045900A1

WO2012045900A1 - Manual cutter with blades that make a continuous cut

Info

Publication number: WO2012045900A1
Application number: PCT/ES2011/070634
Authority: WO
Inventors: Francisco José MUT BOTELLA
Original assignee: Mut Botella Francisco Jose
Priority date: 2010-10-04
Filing date: 2011-09-08
Publication date: 2012-04-12

Abstract

Manual cutter with blades that make a continuous cut, said blades cutting at such an angle to the longitudinal axis of the tool that the block of the cutter does not interfere with the material to be cut. The tool and the user are thus external to the element to be cut and only the blades pass through the material. It is thereby possible to move the blades through the path of the cut made, advance and continue a new cut extending the previous cut without the block of the cutter preventing the tool from advancing. May be achieved by modifying the block of the cutter or simply by changing the set of blades, retaining the features of the cutter of each manufacturer.

Description

MANUAL SHEAR WITH CONTINUOUS CUTTING KNIVES

D E S C R I P C I Ó N

TECHNICAL FIELD OF THE INVENTION

The present invention can be included in the technical field of manual cutting tools. Specifically, the object of the invention relates to a manual shear that allows cutting without interruption along a cutting line longer than that of the blade of the shear itself either by varying the configuration of the blades or modifying the body of the shear.

STATE OF THE TECHNIQUE

Firefighters and, in general, rescue teams, frequently use mechanically operated shears, for example, hydraulic shears, to cut sheet metal and free occupants trapped in an enclosure, particularly in a vehicle.

Said shears comprise two cutting blades arranged parallel to a reduced distance, provided with a substantially flat inner face as well as two sharp cutting edges. The shears additionally comprise a drive body to produce a movement of articulation of the two blades producing at least partial overlapping of the cutting edges, generating a shear cut in a line defined by the intersection of the piece to be cut and the overlapping area of the cutting edges.

The blades of the hydraulic tools blades, currently work in prolongation of the tool itself and on the same axis. They are equal to each other and placed symmetrically with respect to that axis.

In the type of shears described, the line of cut coincides with the central longitudinal axis of the shear, which in turn is the line of advance of said shear, which causes that once the cut is made, the body of the shear collides with the beginning of the cut, preventing the advance of the shear in a second attack.

In this way the length of the cut obtained by this type of shears is limited by the length of the blade of the shear itself. To be able to make a longer cut it is necessary to make successive cuts along two parallel lines and i remove sections of sheet metal by means of transversal cuts, which, even when it is feasible, delays and hinders rescue efforts.

The present invention means that the shear body does not need to penetrate through the cut made, moving outside the material to be cut, being only the blade (s), due to the configuration resulting from this invention, the one or those that penetrate through the material to be cut and can thus make successive cuts prolonging the first.

DESCRIPTION OF THE INVENTION

The invention is based on deflecting the cutting axis at an angle to the tool axis. When these axes do not coincide, the tool moves along the outside of the material to be cut while the blades penetrate the material.

This invention reaches two options with the same principle:

First. Give the standard shear blades a shape, described below, that deflects the cutting line of the tool shaft.

Second. Since it is only one of the blades that penetrates the material to be cut, the second blade can be dispensed with by giving the tool a shape that deflects the cutting line as described below.

Following the first option, these are continuous cutting blades for manual shears characterized by being used in groups of two and that from here we will call blade one and blade two. Each of them can be circumscribed in an orthogonal prism with a wide base and a small height in relation to the base.

They have a substantially flat face at the bottom that we will call base (1), while the upper one that we will call cover (2) has several variations that are explained later.

View the blade from the lid, we will observe the silhouette or profile of the blade.

In this profile we will distinguish two sides: one that, once mounted the set of blades in place in the block of the shear for which it serves, will be faced between the two blades and that when they cross these will produce the shear cut we call internal side (5) and other than by opposition We will call the external side (4), both sides would be separated by an imaginary and non-rectilinear line called the longitudinal axis (3) of the blade.

By dividing the blade into two parts perpendicular to the longitudinal axis of the blade, we will call these parts: articulation zone (B) and cutting area (A).

The so-called articulation zone (B) is characteristic of each model and manufacturer and by way of example and as a most used system, it can have two holes called a turning hole (6) and a movement hole (7) that cross from the lid to the base the blade and which will serve to articulate by means of bolts to the aforementioned block of the shear as follows: turning hole (6), located in the articulation area (B) and internal side (5) that articulates on a point fixed in the shear block, in its longitudinal axis (9) and which is common to the two blades and movement hole (7) located in the articulation zone (B) and external side (4), it is articulated to a connecting rod from the hydraulic or shear block mechanism that emits the force and movement, and transmitting this movement and force causes the blades to close, which by turning the two blades on the turning point (6) and in the opposite direction a respect on the other, they make the cut.

The distance and size of said holes, as well as the configuration of the blade in this area, is determined by the characteristics of the shear for which these "Continuous cutting blades for manual shears" are developed. An example is shown in the illustrations, which shows that the design of its profile does not hinder the movement of its use.

In the so-called cutting area (A) of each blade, the inner and outer sides come to meet at a point called an attack point.

The profile of the blade is different depending on whether it is blade one (figure 1) or blade two (figure 2).

Blade one (figure 1):

Placed the blade one (figure 1) in the place it would occupy in the shear block, we observe that the inner side (5) has a shape inscribed in a concave circular arc, whose circular segment forms an angle with respect to the longitudinal axis of the block of the shear (9).

This internal side (5), has a bevel, with greater base, which forms the cutting edge of this blade. The cover (2) of this blade has an inclined plane from a line perpendicular to the longitudinal axis and from the end of the articulation zone, which decays towards the point of attack.

Blade two (figure 2):

Placed the blade two (figure 2) in the place it would occupy in the shear block, we observe that the inner side (5) has a shape inscribed in a concave circular arc, whose circular segment forms an angle with respect to the longitudinal axis of the block of the shear (9).

This internal side (5), has a bevel, with greater base, which forms the cutting edge of this blade.

The cover (2) of this blade has an inclined plane from a line perpendicular to the longitudinal axis and from the end of the articulation zone, which decays towards the point of attack.

Placed the two blades in their respective housing, it is observed that at a certain time, during the shear closing actuation maneuver, the two circular segments that serve respectively the respective internal sides of each blade, coincide in space, naming at the angle they form at that time, with respect to the longitudinal axis of the shear block, as the cutting angle (8).

The angle of cut (8) of the blades may vary depending on the final design that is chosen depending on, among other issues, to obtain the highest performance to the power of the tool, being able to go from 1 ^or 90 °, that is, perpendicular to the longitudinal axis of the tool.

The design of the articulation zone (B) of both blades will be suitable for each conventional shear model, such that it allows it to be articulated and moved according to the design of each shear manufacturer.

The base (1) of each blade forms a plane especially in those parts where, once mounted in its work location, the two blades come into contact with each other during use, that is, in the surroundings of the turning hole ( 6) and on the inner side (5), at least a sufficient distance for the turning movement to be made in the same plane, and for the cutting to be made without easy deterioration of the cutting edge of the cutting sides. Once these parameters are exceeded, the bases can be rolled back to a plane closer to the inside of each blade to avoid unnecessary friction.

The point of attack can be considered a point where the internal sides (5) and external sides (4), the base (1) and the slope of the cover (2) converge, but in a truncated way, that is, that point would be imaginary and external to the blade since the use given to these blades does not allow such small magnitudes.

The second option is based on the fact that it is only one of the blades that penetrates the material to be cut, the second can be ignored, giving the shear body a shape that allows its operation as described.

The manual shear of continuous cutting is characterized in that the shear block has a characteristic shape in the area of articulation of the blades of conventional shears, called a support arm, in addition to having only a single blade

The piece, called the support arm (19), whose shape is circumscribed in a triangular prism with a rectangular base and which is a structural part of the shear block (16), is characterized in that it has a mainly flat surface (1 1), in an imaginary plane passing through a line (D) perpendicular to the longitudinal axis of the block shear (C) and maintained with reference to the longitudinal axis of the cutter an angle (beta) of between 1 ^and 90 ° (which is to suppose the angle of cut of the shear), two lateral surfaces perpendicular to said plane and parallel to the longitudinal axis of the block of the shear (C) of triangular form, with whose base (12) joins the block of the shear (16 ). Said surfaces are called the cutting face (15) and the closing face (14).

This support arm has on its cutting face (15), close to the confluence of the faces (1 1) and (12), an articulation (17) for the turning hole (21) of the cutting blade.

On the other hand, the cutting blade is configured as follows.

It has a substantially flat face in its lower part that we will call the base, while the upper one that we will call the cover has several variations that are explained later.

In this profile we will distinguish two sides: one that, once mounted in place in the block of the shear for which it serves, will face the arm of support and that when it intersects with this will produce the shear cut which we call internal side (23) and another that we will call external side (24), both sides would be separated by an imaginary and non-rectilinear line called the longitudinal axis of the blade.

By dividing the blade into three parts perpendicular to the longitudinal axis of the blade, we will call these parts: articulation zone (R), intermediate zone (S) and cutting zone (T).

The so-called blade articulation zone (R) has two holes called the turning hole (21) and movement hole (22) that pass from the lid to the base of the blade and which will serve to articulate the aforementioned block of the shear of the following way: the turning hole (21), located in the articulation zone (R) and internal side (23) is articulated on a fixed turning point (17) in the support arm (19) and the movement hole (22) located in the articulation zone (R) and external side (24), it is articulated to a connecting rod (18) from the hydraulic or mechanism of the shear block (16) that emits the force and movement, and transmitting this movement and force causes the blade to rotate, overlapping with the support arm on the turning point (17) and along the cutting face (15) of the support arm, making the shear cut.

The distance between the holes in the blade determines the lever arm with which the blade acts during cutting. This distance, as well as the size of the turning holes (21) and movement holes (22), are designed according to the power of the shear, the hardness of its blades and the intended use.

The intermediate area of the blade (S) corresponds to an area between the articulation (R) and the cutting area (T) and is characterized in that it can have a thickness (distance between the base and the cover) smaller than in the area of cutting, so that once the cut is made and the shear is opened again, advance through the cut made due to this smaller thickness and move the shear in a more advanced position to continue cutting.

In the so-called knife cutting area (T), the inner (23) and outer (24) sides come to a point called a point of attack.

The point of attack of the blade can be considered a point where the inner side (23) and the outer side (24), the base and the slope of the lid meet, but in a truncated way, that is, that point would be imaginary and outside the blade since the use given to these blades does not allow such small magnitudes.

Placed the blade in the place that would occupy in the block of the shear we observe that the internal side (23) presents a form inscribed in a concave circular arc, whose circular segment forms an angle with respect to the longitudinal axis of the block of the shear (C) towards the side of the support arm (1 1).

This inner side (23) has a bevel, with a larger base, which forms the cutting edge of this blade.

The cover of this blade has an inclined plane from a line perpendicular to the longitudinal axis and from the end of the articulation zone, which decays towards the point of attack.

The cutting area (T), may have a thickness (height between the base and the lid) greater than in the intermediate zone (S), so that, when making the cut, it produces a deformation separation in the material to cut enough to advance as explained in the paragraph of the intermediate zone.

The base of the blade forms a plane around the turning hole (21) and on the inner side (23), at least a sufficient distance for the turning movement to be performed in the same plane, which is the same plane of the cutting face (15) and that the cutting is carried out without easy deterioration of the cutting edge of the cutting side. Once these parameters are exceeded, the base can be rolled back to a plane closer to the inside of the blade to avoid unnecessary friction.

ADVANTAGES OF THE INVENTION

The manual shear with continuous cutting blades, allows the possibility of making a cut that is not conditioned by the size of the blades compared to conventional shears.

This invention allows both new shear models to be manufactured and continuous cutting blades to be placed on existing models.

It allows to advance in a cut made extending it in length as well as to vary its rectilinear trajectory.

The operation of a continuous cutting tool makes the operator and the tool itself work from outside the surface to be cut, which improves the working conditions of the operator and certainly does not interfere with the position of the victim to be rescued, avoiding that the shear block invades the interior spaces of the vehicles in which it operates.

Compared to other cutting options, this continuous cutting invention does not produce the vibrations of the reciprocating saws and has the full potential of the tool to which they are coupled.

DESCRIPTION OF THE DRAWINGS

To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, according to a preferred example of practical implementation thereof, a set of drawings is attached as an integral part of said description. where, for illustrative and non-limiting purposes, the following has been represented:

Figure 1 .- shows blade one, in perspective, the base (1) being low and hidden from view and the cover (2) visible. The longitudinal axis (3) that separates the outer side (4) from the inner side (5) is drawn with a dotted line. The turning hole (6) and the moving hole (7) are described.

Figure 2 shows the blade two, in perspective, the cover (2) being low and hidden from view and the base (1) visible. The longitudinal axis (3) that separates the outer side (4) from the inner side (5) is drawn with a dotted line. The turning hole (6) and the moving hole (7) are described.

Figure 3.- shows the blades one and two differentiating the cutting areas (A) and articulation zone (B), seen in plan, the base (1) of both blades being hidden and the cover (2) visible.

Figure 4.- Shows a view of the blades placed in their location in the shear, in which the cutting angle (alpha) formed by the longitudinal axis of the shear block (9) and the longitudinal axis of the cut ( 8) at the time of overlapping the blades during cutting.

Figure 5.- Schematically shows the position and volume where the support arm is circumscribed between the faces (1 1, 12, 13, 14 and 15). The longitudinal axis of the shear block (C) along the shear block (16), the line (D) perpendicular to the mentioned axis and which serves the plane of the support face (12). The cutting angle (beta), which is in relation to the longitudinal axis of the block (C) and the plane of the support face (1 1). Figure 6.- Shows in detail the support arm (19) that is part of the shear block (16) and the joint (17) where the orifice of rotation of the blade (21) as well as the connecting rod (18) is located ) of the hydraulic or mechanism that gives strength and movement to the blade. The drawing shows a non-exhaustive system for fixing the blade by bolt to both the arm and the connecting rod.

Figure 7.- Shows a blade in perspective seen from the lid, the base is hidden. The articulation zones (R), intermediate zone (S) and cutting zone (T) are described. The turning hole (21) and the movement hole (22). Likewise, the inner side (23) and the outer side (24) of the blade are defined.

Figure 8.- Shows a view of the blade in perspective, being able to appreciate the details of the height of the cutting area (T) in relation to the intermediate zone (S).

Figure 9.- Shows a view of the shear with the blade mounted in its workplace. The shear block (16), the support arm, the support face (1 1), the cut face (15) with its joint (17) assembled to the turning hole (21) of the blade, the connecting rod (18) articulated to the hole of movement of the blade.

PREFERRED MODE OF EMBODIMENT

The continuous cutting blades for manual shearing can be done by laser cutting of metal sheet the thickness of the blade, giving the shape of its plan view.

Through turning and milling techniques, the holes are drilled and the different recesses and bevels are made according to the description and claims.

The choice of metal and its hardening by various thermochemical techniques, gives the finish the desired strength according to its use.

The manual shear of continuous cutting has its reference in the manual shears of cut in tasks of firemen and especially for uses in rescue.

Unlike traditional shears, it has as specified a support arm and a single blade.

The support arm is a piece that is attached to the shear block.

This block is usually covered by a tubular housing, part of the same block and which contains the mechanical or hydraulic system that provides the force and movement, through a connecting rod, to the blade.

The support arm will be made of resistant material for the intended use, preferably metal and will be attached to the tube that forms the shear block housing.

This tube will also be of sufficient wall thickness to receive the thrust through the support arm and maintain its use.

The arm can be attached to the shear block by welding on its face 2 to the tube that covers the block, as well as bolted to it in a resistant manner, as well as being part of the block itself.

Claims

R E I V I N D I C A C I O N E S

OPTION ONE

1 - Manual shear with continuous cutting blades characterized in that they consist of two different blades in one respect to the other and the intersection line in which the two blades intersect to produce the cutting by overlapping the blades, takes place in a angle (alpha) with respect to the longitudinal axis of the shear block (9):

2- Manual shear with continuous cutting blades, according to the preceding claim, characterized in that in each of the two blades that make up the assembly, there is an area called articulation zone (B) to articulate to the shear block (by way of example with holes 6 and 7) with the characteristics of each shear model to which they are intended.

Its shape also will not impede the movement that the designer or manufacturer of the shear block has conceived for its operation.

3- Manual shear with continuous cutting blades, according to claims 1 and 2, characterized in that in a first blade called blade one, the cutting area (A), forms the cutting edge and is circumscribed in a concave circular sector whose circular segment It has an angle with respect to the longitudinal axis of the shear block (9). Crossing the semiplane where the blade is located and intersecting the longitudinal axis of the shear block (9).

4- Manual shear with continuous cutting blades, according to claims 1 and 2, characterized in that in a second blade called blade two, the cutting area (A), forms the cutting edge and is circumscribed in a concave circular sector whose circular segment It has an angle with respect to the longitudinal axis of the shear block (9) equal to that of the blade one. In this case, the longitudinal axis of the shear block (9) does not intersect and faces the cutting area of the blade one.

5- Manual shear with continuous cutting blades, according to claims 3 and 4, characterized in that the imaginary circular segments that each delimit the circular sectors of the cutting areas (A) of each of the blades are, at a certain time during the driving movement of the use of the shear, coinciding in space and at that time forming an angle with respect to the longitudinal axis of the shear block (9) called the cutting angle (a).

OPTION TWO

6- Manual shear with continuous cutting blades, characterized by presenting a support arm (19) that is part of the shear block (16) inscribed in a rectangular prism with a triangular base and a single blade.

7. - Manual shear with continuous cutting blades, according to the preceding claim, characterized in that its support arm forms a structural part of the shear block (16). The coincident surfaces on the triangular faces are called the cutting face (15) and the closing face (14) and run in two planes parallel to the longitudinal axis of the shear (C). Faces connecting these two triangles are named: face (1 1) located in a plane perpendicular to the axis of the cutter and forming with this an angle (beta) of between 1 and 90 ° ^or. Base face (12) attached to the shear block. And face (13) that closes the set.

8. - Manual shear with continuous cutting blades, according to the preceding claim, characterized in that its support arm can have on its cutting face (15), close to the confluence of the faces (1 1) and (12), a bolt (17) as articulation of the turning hole (21) of the cutting blade.

9. - Manual shear with continuous cutting blades, according to claim 6, characterized in that the blade has three distinct zones called cutting (T), intermediate (S) and articulation (R) areas.

10. - Manual shear with continuous cutting blades, according to claim 6, characterized in that its single blade is articulated to a fixed point (17) in the support arm (19) and to the transmitter of the force element (in the example the connecting rod 18) coming from the shear block (16) and whose base moves along a plane coinciding with the one that forms the cutting face (15) of the support arm (19).

eleven . - Manual shear with continuous cutting blades, according to claim 9, characterized in that the blade can have a thickness (distance between the cover and the base of the blade), greater in the cutting area (T) than in the intermediate zone (S )

12. - Manual shear with continuous cutting blades, according to claims 6, characterized in that the cutting line has an angle (beta) in reference to the longitudinal axis of the shear block (C), due to the configuration of its support arm and the design of the cutting blade.