WO2010103131A1 - Manual shears for plastic tubes - Google Patents
Manual shears for plastic tubes Download PDFInfo
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- WO2010103131A1 WO2010103131A1 PCT/ES2009/000124 ES2009000124W WO2010103131A1 WO 2010103131 A1 WO2010103131 A1 WO 2010103131A1 ES 2009000124 W ES2009000124 W ES 2009000124W WO 2010103131 A1 WO2010103131 A1 WO 2010103131A1
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- blade
- axis
- shear
- arms
- arm
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
- B26D3/16—Cutting rods or tubes transversely
- B26D3/169—Hand held tube cutters
Definitions
- the present invention relates to a hand-held shear that has been specially designed for plastic pipes, such as PVC, PP, PX tubes, etc., multi-layer tubes and the like, which by their very nature offer a remarkable resistance to cut.
- the object of the invention is to achieve a shear which, in addition to offering a perfect finish in the cut, offers a great ease of handling, both as regards the cutting and recoil of the blade, as well as the replacement thereof, which is almost instantaneous and without tools.
- the invention thus falls within the scope of manual cutting tools for plastic tubes.
- Pliers are known for cutting plastic tubes based on two articulated arms, scissor type, to one of which a blade is joined laterally that in the closing of the pliers and with interposition of the corresponding tube, advances, towards an existing bearing in the other arm, producing the cut.
- This type of pliers presents a problem with a double slope, on the one hand the blade always remains in a situation of direct accessibility, which implies a permanent risk of accident by cutting, and on the other hand the blade is rigidly attached to the corresponding arm with the collaboration of a pair of screws, which is a slow task of replacing the blade, since it is necessary to disassemble the aforementioned screws, remove the used blade, place the new blade and assemble and tighten the aforementioned screws.
- pliers are suitable for tubes of relatively small diameter, less than 35 mm, but for larger diameter tubes the opening of the pliers is excessive, with the consequent little lever arm, so there are solutions for this second case in which The blade has a serrated edge in its opposite area to the cut, so that said drag occurs intermittently, that is, achieving partial advances of the blade edge each time the arms of the blade are closed.
- the pliers are suitable for tubes of relatively small diameter, less than 35 mm, but for larger diameter tubes the opening of the pliers is excessive, with the consequent little lever arm, so there are solutions for this second case in which The blade has a serrated edge in its opposite area to the cut, so that said drag occurs intermittently, that is, achieving partial advances of the blade edge each time the arms of the blade are closed.
- the pliers are suitable for tubes of relatively small diameter, less than 35 mm, but for larger diameter tubes the opening of the pliers is excessive, with the consequent little lever arm, so there are solutions for this second case in which The blade has a serrated edge
- the shear that is recommended incorporates a hollow body, based on two long leaflets in two half-arms that together define one of the arms of the shear, counting said leaflets with holes facing for coupling of a pin in functions of axis of rotation for the blade, located between both leaflets and susceptible to emerge to the outside through grooves defined by them.
- One of the leaflets also incorporates a fixed axis for a tilting crosshead against a strap and provided with a tooth that acts as a ratchet acting on a tooth existing on the edge of the blade, in order to limit the degree of retraction of the blade, which will be assisted by a strap, as will be seen later.
- the aforementioned blade is actuated by a pusher arm, articulated mounted on the second arm of the shear, which in turn is mounted with freedom of rotation on the body, in the vicinity of both the axis of tilt of the crosshead and the axis of tilt of the connecting rod.
- This tilting axis of the arm is assisted by a spring against which said arm is operable in the direction of approaching the other arm of the shear, the one constituted by the complementary extensions of the two leaflets.
- said connecting rod is topped by its free end in a tooth, complementary to the said tooth set at the edge of the blade, so that the actuation of the corresponding arm to which it is associated entails the thrust of the blade through the point of support of the aforementioned arm on its teeth, causing an angular displacement of the same, which will be limited and stabilized, as previously said through the aforementioned crosshead, when pressure is stopped on the corresponding arm, moving at this time the point of support of the tooth of the connecting rod on the teeth of the blade at a previous point with respect to that of the same anterior maneuver, to allow, by means of several actuations of the corresponding arm, the progressive displacement of the blade until the definitive cut occurs of the tube.
- the link adopts a grooved configuration and incorporates a central and middle groove in which the crosshead plays.
- an open groove is defined towards the hollow interior thereof and next to which a stud is established externally, so that in this groove a spring is fitted tightly, which is immobilized laterally by - 3 *•
- the second leaflet is coupled and fixed by means of through screws through one of them and that Thread in the other.
- Figure L- Shows a side elevation view of a manual shear for plastic pipes made in accordance with the object of the present invention.
- Figure 2. Shows, a view similar to that of the previous figure, in which the shear appears devoid of one of its leaflets, to allow visualizing its interior structure.
- Figure 3 Finally shows an exploded view of the different components that make up the shear.
- the shear that the invention proposes is constituted by a hollow body in which two leaflets (1 and 2) participate, equipped with respective extensions constituting two half-arms (3-3 '), counting These leaflets (1 and 2) with the necessary recess (26) determining the seat for the pipe to be cut, and provided with two holes (4), facing each other, for coupling of a detachable pin (5), which constitutes the axis of the blade (6), to which it crosses through a hole (7), defining between both leaflets a slot for partial emergency outside the blade (6) and for total output in case of changing it.
- the tilting axis (8) is also established for the second arm (9) of the shear, axis (8) on which a spring (10) is placed which tends to the opening of the arms (3 and 9).
- the aforementioned arm (9) adopts a ribbed configuration and in the vicinity of its own tilt axis (8) incorporates another tilt axis (11), accompanied by a spring, axis on which a path link (12) is tiltable angled, also of ribbed configuration, in whose middle branch and in centered arrangement it incorporates a groove for passage of a crosshead (13) tilting against the tension of a strap (14) and provided with a tooth (15) through which the blade (6) acts on a toothed sector (16) of the edge of the blade.
- This crosshead (13) swings on an axis (17) also mounted in the body between both leaflets (1 and 2) and does so each time the arm (9) approaches the arm (3), preventing the retraction of the blade (6), advancing intermittently against the tension of a spring (19) that is housed within a groove (20) operatively established in one of the leaflets (1) of the body, a spring that by one of its ends is set in a busty
- the aforementioned intermittent advance of the blade (6) is produced through the thrust of the tooth (27) in which the connecting rod (12) is finished, with a "U" section, whose branch half progressively fits into the housings defined in the teeth (16) of the edge of the blade, so that the actuation of the arm (9) causes an angular displacement of said blade around the pin (5), which is locked, in the sense of retraction for it, through the tooth (15) defined in the crosshead (13), which has an appendix (18) that emerges outside the body through a defined groove between both leaflets, so that by acting with the same hand that the shear is holding on said appendix (18), the tooth (15) is released from the teeth of the blade (6), and it retracts automatically, due to the effect of the spring (19) , leaving its cutting edge hidden within the said hollow body (1-2).
- leaflets (1 and 2) have holes (24) through one of them and threaded in the other, for the definitive fixing of both leaflets with the collaboration of screws, that the same happens at the level of the extreme area of the half-arms (3-3 ') and that between both half-arms a rubber or rubber lining (25) is fitted and fixed that improves the ergonomics of the tool.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Scissors And Nippers (AREA)
Abstract
The invention relates to manual shears for plastic tubes, formed by a hollow body consisting of two half-jaws extending into two half-arms and connected by screws, with a blade being disposed therebetween. A sector of the edge of the blade is serrated so that the shears can be closed using an intermittent movement. The invention is characterized in that the rotation shaft (5) of the blade comprises a removable pin and the blade is connected to the hollow body by means of a spring (19) housed in a groove (20) in one of the jaws (1). One end of the spring is attached to the hollow body by means of a lug (21), while the other end thereof is provided with an elongate ring which receives a projection (23) of the blade. In this way, the blade can be replaced very quickly and easily simply by removing the above-mentioned removable pin and pulling the blade in order to detach same. Similarly the new blade is installed simply by inserting the aforementioned projection through the loop of the spring and aligning the hole (7) in the blade with the complementary holes (4) in the jaws in order to insert the pin (5).
Description
CIZALLA MANUAL PARA TUBOS DE PLÁSTICO MANUAL SHEAR FOR PLASTIC PIPES
D E S C R I P C I Ó ND E S C R I P C I Ó N
OBJETO DE LA INVENCIÓNOBJECT OF THE INVENTION
La presente invención se refiere a una cizalla de mano que ha sido especialmente concebida para tubos de plástico, tales como tubos de PVC, PP, PX, etc., tubos multi-capa y similares, que por su propia naturaleza ofrezcan una notable resistencia al corte.The present invention relates to a hand-held shear that has been specially designed for plastic pipes, such as PVC, PP, PX tubes, etc., multi-layer tubes and the like, which by their very nature offer a remarkable resistance to cut.
El objeto de la invención es conseguir una cizalla que, además de ofrecer un perfecto acabado en el corte, ofrezca una gran facilidad de manejo, tanto en lo que se refiere al corte y retroceso de la cuchilla, como a la sustitución de la misma, que resulta prácticamente instantánea y sin necesidad de herramientas.The object of the invention is to achieve a shear which, in addition to offering a perfect finish in the cut, offers a great ease of handling, both as regards the cutting and recoil of the blade, as well as the replacement thereof, which is almost instantaneous and without tools.
La invención se sitúa pues en el ámbito de las herramientas manuales de corte para tubos de plástico.The invention thus falls within the scope of manual cutting tools for plastic tubes.
ANTECEDENTES DE LA INVENCIÓNBACKGROUND OF THE INVENTION
Son conocidas tenazas para corte de tubos de plástico a base de dos brazos articulados, tipo tijera, a uno de los cuales es solidaria lateralmente una cuchilla que en el cierre de la tenaza y con interposición del correspondiente tubo, avanza, hacia una sufridera existente en el otro brazo, produciendo el corte.
Este tipo de tenaza presenta una problemática con una doble vertiente, por un lado la cuchilla permanece siempre en situación de directa accesibilidad, lo que supone un permanente riesgo de accidente por corte, y por otro lado la cuchilla está rígidamente unida al brazo correspondiente con la colaboración de una pareja de tornillos, lo que supone una tarea lenta de sustitución de la cuchilla, ya que es preciso desmontar los citados tornillos, extraer la cuchilla usada, colocar la cuchilla nueva y montar y apretar de nuevo los citados tornillos.Pliers are known for cutting plastic tubes based on two articulated arms, scissor type, to one of which a blade is joined laterally that in the closing of the pliers and with interposition of the corresponding tube, advances, towards an existing bearing in the other arm, producing the cut. This type of pliers presents a problem with a double slope, on the one hand the blade always remains in a situation of direct accessibility, which implies a permanent risk of accident by cutting, and on the other hand the blade is rigidly attached to the corresponding arm with the collaboration of a pair of screws, which is a slow task of replacing the blade, since it is necessary to disassemble the aforementioned screws, remove the used blade, place the new blade and assemble and tighten the aforementioned screws.
Parte de la problemática anteriormente citada, concretamente el aspecto de seguridad, se resuelve con otro tipo de tenaza en la que la cuchilla se mantiene retraída hacia el interior de la carcasa de la tenaza, en situación operante de la misma, al menos en lo que a su filo cortante se refiere, de manera que el contacto accidental con dicho filo resulta prácticamente imposible.Part of the aforementioned problem, specifically the safety aspect, is solved with another type of pliers in which the blade is held back towards the inside of the clamp housing, in its operating position, at least in what its cutting edge is referred to, so that accidental contact with said cutting edge is practically impossible.
Sin embargo esta tenaza sigue manteniendo la problemática anteriormente citada en cuanto a la complejidad de las maniobras de sustitución de la cuchilla, problemática que no solo se mantiene sino que se incrementa, puesto que además de tener que desmontar la cuchilla de uno de los brazos citados, se hace preciso desmontar las dos piezas que integran el otro brazo de la tenaza.However, this pincer continues to maintain the aforementioned problem regarding the complexity of the knife replacement maneuvers, a problem that not only remains but is increased, since in addition to having to disassemble the blade of one of the aforementioned arms , it is necessary to disassemble the two pieces that make up the other arm of the pliers.
Estas tenazas resultan adecuadas para tubos de diámetro relativamente reducido, inferior a 35 mm, pero para tubos de mayor diámetro la apertura de la tenaza resulta excesiva, con el consecuente escaso brazo de palanca, por lo que existen soluciones para este segundo caso en los que la cuchilla presenta un borde dentado en su zona opuesta al corte, de manera que dicho arrastre se produce de forma intermitente, es decir consiguiendo avances parciales del filo de la cuchilla cada vez que se cierran los brazos de
Ia tenaza.These pliers are suitable for tubes of relatively small diameter, less than 35 mm, but for larger diameter tubes the opening of the pliers is excessive, with the consequent little lever arm, so there are solutions for this second case in which The blade has a serrated edge in its opposite area to the cut, so that said drag occurs intermittently, that is, achieving partial advances of the blade edge each time the arms of the blade are closed. The pliers.
En este caso también se sigue manteniendo la problemática relativa a la complejidad de las maniobras de sustitución de la cuchilla, por cuanto que se hace preciso el desmontaje de la tenaza, lo que supone una pérdida de tiempo muy considerable.In this case, the problem related to the complexity of the knife replacement maneuvers is also maintained, since it is necessary to disassemble the pliers, which means a considerable loss of time.
DESCRIPCIÓN DE LA INVENCIÓNDESCRIPTION OF THE INVENTION
La cizalla manual que la invención propone resuelve de forma plenamente satisfactoria la problemática anteriormente expuesta, en los diferentes aspectos comentados.The manual shear that the invention proposes solves in a fully satisfactory way the problem previously stated, in the different aspects mentioned.
Para ello y de forma mas concreta la cizalla que se preconiza incorpora un cuerpo hueco, a base de dos valvas prolongadas en sendos semibrazos que en su conjunto definen uno de los brazos de accionamiento de la cizalla, contando dichas valvas con orificios enfrentados para acoplamiento de un pasador en funciones de eje de giro para la cuchilla, situado entre ambas valvas y susceptible de emerger al exterior a través de ranuras definidas por las mismas.To do this and more specifically, the shear that is recommended incorporates a hollow body, based on two long leaflets in two half-arms that together define one of the arms of the shear, counting said leaflets with holes facing for coupling of a pin in functions of axis of rotation for the blade, located between both leaflets and susceptible to emerge to the outside through grooves defined by them.
Una de las valvas incorpora además un eje fijo para una cruceta basculante en contra de un fleje y provista de un diente que a modo de trinquete actúa sobre un dentado existente en el borde la cuchilla, en orden a conseguir limitar el grado de retracción de la cuchilla, la cual estará asistida por un fleje, tal y como se verá mas adelante.
La citada cuchilla es accionada por un brazo empujador, montado articuladamente sobre el segundo brazo de la cizalla, que a su vez está montado con libertad de giro sobre el cuerpo, en las inmediaciones tanto del eje de basculación de la cruceta como del eje de basculación de la biela. Este eje de basculación del brazo está asistido por un muelle en contra del que dicho brazo es accionable en sentido de aproximación al otro brazo de la cizalla, el constituido por las prolongaciones complementarias de las dos valvas.One of the leaflets also incorporates a fixed axis for a tilting crosshead against a strap and provided with a tooth that acts as a ratchet acting on a tooth existing on the edge of the blade, in order to limit the degree of retraction of the blade, which will be assisted by a strap, as will be seen later. The aforementioned blade is actuated by a pusher arm, articulated mounted on the second arm of the shear, which in turn is mounted with freedom of rotation on the body, in the vicinity of both the axis of tilt of the crosshead and the axis of tilt of the connecting rod. This tilting axis of the arm is assisted by a spring against which said arm is operable in the direction of approaching the other arm of the shear, the one constituted by the complementary extensions of the two leaflets.
Así pues, la citada biela se remata por su extremidad libre én un diente, complementario del comentado dentado establecido en el borde de la cuchilla, de manera que el accionamiento del correspondiente brazo al que está asociado conlleva el empuje de la cuchilla a través del punto de apoyo del citado brazo sobre su dentado, provocándose un desplazamiento angular de la misma, que quedará limitado y estabilizado, como anteriormente se ha dicho a través de la citada cruceta, cuando se deje de hacer presión sobre el correspondiente brazo, trasladándose en este momento el punto de apoyo del diente de la bieleta sobre el dentado de la cuchilla a un punto anterior con respecto al de la maniobra igualmente anterior, para permitir mediante varios accionamientos del correspondiente brazo, el desplazamiento progresivo de la cuchilla hasta que se produzca el definitivo corte del tubo.Thus, said connecting rod is topped by its free end in a tooth, complementary to the said tooth set at the edge of the blade, so that the actuation of the corresponding arm to which it is associated entails the thrust of the blade through the point of support of the aforementioned arm on its teeth, causing an angular displacement of the same, which will be limited and stabilized, as previously said through the aforementioned crosshead, when pressure is stopped on the corresponding arm, moving at this time the point of support of the tooth of the connecting rod on the teeth of the blade at a previous point with respect to that of the same anterior maneuver, to allow, by means of several actuations of the corresponding arm, the progressive displacement of the blade until the definitive cut occurs of the tube.
Al objeto de equilibrar la maniobra de accionamiento frente a posibles tendencias a la basculación lateral de los elementos móviles, la bieleta adopta una configuración acanalada e incorpora una ranura central y media en la que juega la cruceta.In order to balance the actuation maneuver against possible tendencies to the lateral tilting of the moving elements, the link adopts a grooved configuration and incorporates a central and middle groove in which the crosshead plays.
Como complemento de la estructura descrita en una de las valvas se define una acanaladura abierta hacia el interior hueco de la misma y junto a la que se establece exteriormente un tetón, de manera que en esta acanaladura se acopla ajustadamente un muelle, que queda inmovilizado lateralmente por
— 3 *•As a complement to the structure described in one of the leaflets, an open groove is defined towards the hollow interior thereof and next to which a stud is established externally, so that in this groove a spring is fitted tightly, which is immobilized laterally by - 3 *•
la propia acanaladura y por la tapa de la misma definida por la otra valva, fleje rematado por uno de sus extremos en una anilla de acoplamiento al citado tetón, mientras que su otro extremo define una anilla mucho mas alargada y preferentemente abierta, que recibe a un apéndice de la cuchilla, situado radial y marginalmente en la misma.the groove itself and by the cover of the same defined by the other leaflet, strip topped by one of its ends in a ring of engagement to the aforementioned stud, while its other end defines a much more elongated and preferably open ring, which receives an appendix of the blade, located radially and marginally therein.
De acuerdo con esta estructuración, extrayendo el pasador en funciones de eje de giro para la cuchilla, lo que constituye una maniobra sumamente simple, dicha cuchilla puede ser extraída para su sustitución, efectuándose el montaje también de una forma igualmente sencilla, ya que basta con enfilar el apéndice de la nueva cuchilla hacia el anillo o argolla interior del muelle, para que quede acoplada a éste último, buscando seguidamente la situación de enfrentamiento del orificio de la cuchilla con los orificios de las valvas, para permitir la reimplantación del citado pasador, el cual se mantiene estable en situación de trabajo merced a la existencia en el mismo de una diminuta bola retráctil en contra de un muelle, que se enclava en la embocadura de uno de los orificios citados, concretamente el correspondiente a una de las valvas y situado en el fondo de un rehundido que facilita el empuje manual sobre dicho pasador, para desmontaje del mismo.In accordance with this structuring, by removing the pin in functions of the axis of rotation for the blade, which constitutes an extremely simple maneuver, said blade can be removed for replacement, the assembly being also carried out in an equally simple way, since it is enough to sharpen the appendix of the new blade towards the ring or inner ring of the spring, so that it is coupled to the latter, then looking for the situation of confrontation of the hole of the blade with the holes of the leaflets, to allow the reimplantation of said pin, which remains stable in a work situation thanks to the existence in it of a tiny retractable ball against a spring, which is locked in the mouth of one of the mentioned holes, specifically that corresponding to one of the leaflets and located at the bottom of a recess that facilitates manual thrust on said pin, to disassemble it.
Por lo demás y como es lógico, tras el montaje de los mecanismos interiores y el segundo brazo de la cizalla sobre una de las valvas, se procede al acoplamiento de la segunda valva y a su fijación mediante tornillos pasantes a través de una de ellas y que roscan en la otra.For the rest and as is logical, after the assembly of the internal mechanisms and the second arm of the shear on one of the leaflets, the second leaflet is coupled and fixed by means of through screws through one of them and that Thread in the other.
DESCRIPCIÓN DE LOS DIBUJOSDESCRIPTION OF THE DRAWINGS
Para complementar la descripción que se está realizando y con objeto de ayudar a una mejor comprensión de las características del invento,
de acuerdo con un ejemplo preferente de realización práctica del mismo, se acompaña como parte integrante de dicha descripción, un juego de dibujos en donde con carácter ilustrativo y no limitativo, se ha representado lo siguiente:To complement the description being made and in order to help a better understanding of the features of the invention, In accordance with a preferred example of practical realization thereof, a set of drawings is attached as an integral part of said description, where, as an illustration and not limitation, the following has been represented:
La figura L- Muestra una vista en alzado lateral de una cizalla manual para tubos de plástico realizada de acuerdo con el objeto de la presente invención.Figure L- Shows a side elevation view of a manual shear for plastic pipes made in accordance with the object of the present invention.
La figura 2.- Muestra, una vista similar a la de la figura anterior, en la que la cizalla aparece desprovista de una de sus valvas, para permitir visualizar su estructura interior.Figure 2.- Shows, a view similar to that of the previous figure, in which the shear appears devoid of one of its leaflets, to allow visualizing its interior structure.
La figura 3. Muestra, finalmente un despiece de los distintos componentes que conforman la cizalla.Figure 3. Finally shows an exploded view of the different components that make up the shear.
REALIZACIÓN PREFERENTE DE LA INVENCIÓNPREFERRED EMBODIMENT OF THE INVENTION
A la vista de las figuras reseñadas puede observarse como la cizalla que la invención propone está constituida mediante un cuerpo hueco en el que participan dos valvas (1 y 2), dotadas de respectivas prolongaciones constitutivas de sendos semibrazos (3-3'), contando estas valvas (1 y 2) con la necesaria escotadura (26) determinante del asiento para el tubo a cortar, y provistas de sendos orificios (4), enfrentados, para acoplamiento de un pasador desmontable (5), que constituye el eje de la cuchilla (6), a la que atraviesa a través de un orificio (7), definiéndose entre ambas valvas una ranura para emergencia parcial al exterior de la cuchilla (6) y para salida total en caso de cambio de la misma.
Entre las valvas (1 y 2) constitutivas del cuerpo se establece además el eje de basculación (8) para el segundo brazo (9) de la cizalla, eje (8) sobre el que se sitúa un muelle (10) que tiende a la apertura de los brazos (3 y 9).In view of the aforementioned figures, it can be seen how the shear that the invention proposes is constituted by a hollow body in which two leaflets (1 and 2) participate, equipped with respective extensions constituting two half-arms (3-3 '), counting These leaflets (1 and 2) with the necessary recess (26) determining the seat for the pipe to be cut, and provided with two holes (4), facing each other, for coupling of a detachable pin (5), which constitutes the axis of the blade (6), to which it crosses through a hole (7), defining between both leaflets a slot for partial emergency outside the blade (6) and for total output in case of changing it. Between the leaflets (1 and 2) constituting the body, the tilting axis (8) is also established for the second arm (9) of the shear, axis (8) on which a spring (10) is placed which tends to the opening of the arms (3 and 9).
El citado brazo (9) adopta una configuración acanalada y en las inmediaciones de su propio eje de basculación (8) incorpora otro eje de basculación (11), acompañado de un muelle, eje sobre el que es basculante una bieleta (12) de trayectoria acodada, también de configuración acanalada, en cuya rama media y en disposición centrada incorpora una ranura para paso de una cruceta (13) basculante en contra de la tensión de un fleje (14) y provista de un diente (15) a través del que actúa sobre un sector dentado (16) del borde la cuchilla (6).The aforementioned arm (9) adopts a ribbed configuration and in the vicinity of its own tilt axis (8) incorporates another tilt axis (11), accompanied by a spring, axis on which a path link (12) is tiltable angled, also of ribbed configuration, in whose middle branch and in centered arrangement it incorporates a groove for passage of a crosshead (13) tilting against the tension of a strap (14) and provided with a tooth (15) through which the blade (6) acts on a toothed sector (16) of the edge of the blade.
Esta cruceta (13) bascula sobre un eje (17) montado también en el cuerpo entre ambas valvas (1 y 2) y lo hace cada vez que el brazo (9) se aproxima al brazo (3), impidiendo la retracción de la cuchilla (6), avanzando intermitentemente en contra de la tensión de un muelle (19) que se aloja en el seno de una acanaladura (20) operativamente establecida en una de las valvas (1) del cuerpo, muelle que por uno de sus extremos se enclava en un tetónThis crosshead (13) swings on an axis (17) also mounted in the body between both leaflets (1 and 2) and does so each time the arm (9) approaches the arm (3), preventing the retraction of the blade (6), advancing intermittently against the tension of a spring (19) that is housed within a groove (20) operatively established in one of the leaflets (1) of the body, a spring that by one of its ends is set in a busty
(21) de la citada valva, mientras que por el otro define el amplio brazo (22) a través del que es pasante el apéndice (23) definido en la propia cuchilla, de manera que tal apéndice (23) adopta una disposición sensiblemente radial con respecto al eje de giro (5) de la cuchilla, y si dicho eje se desmonta, ya que como anteriormente se ha dicho se trata de un pasador extraíble, la cuchilla puede a su vez ser fácilmente extraída de la cizalla, para sustitución por otra nueva, y en este último montaje tan solo es preciso tener en consideración que el citado apéndice (23) de la cuchilla debe penetrar por el lazo (22) del muelle, buscando después la situación de enfrentamiento del orificio (7) de la cuchilla a los orificios (4) de las valvas, para colocar de nuevo el pasador (5).
TaI y como se ha comentado anteriormente, el citado avance intermitente de la cuchilla (6), se produce a través del empuje del diente (27) en el que se remata la bieleta (12), de sección en "U", cuya rama media encaja progresivamente en los alojamientos que se definen en el dentado (16) del borde de la cuchilla, de manera que el accionamiento del brazo (9) provoca un desplazamiento angular de dicha cuchilla en torno al pasador (5), quedando ésta bloqueada, en sentido de retracción para la misma, a través del diente (15) que se define en la cruceta (13), la cual dispone de un apéndice (18) que emerge al exterior del cuerpo a través de una ranura definida entre ambas valvas, de manera que actuando con la misma mano que se está sujetando la cizalla sobre dicho apéndice (18), se libera el diente (15) del dentado de la cuchilla (6), y ésta se retrae automáticamente, por efecto del muelle (19), quedando su filo de corte oculto en el seno del citado cuerpo hueco (1-2).(21) of said valve, while on the other it defines the broad arm (22) through which the appendix (23) defined in the blade itself is passed, so that such appendix (23) adopts a substantially radial arrangement with respect to the axis of rotation (5) of the blade, and if said axis is disassembled, since as mentioned above it is a removable pin, the blade can in turn be easily removed from the shear, for replacement by a new one, and in this last assembly it is only necessary to take into account that the aforementioned appendix (23) of the blade must penetrate the loop (22) of the spring, then looking for the situation of confrontation of the hole (7) of the blade to the holes (4) of the leaflets, to replace the pin (5). TaI and as mentioned above, the aforementioned intermittent advance of the blade (6), is produced through the thrust of the tooth (27) in which the connecting rod (12) is finished, with a "U" section, whose branch half progressively fits into the housings defined in the teeth (16) of the edge of the blade, so that the actuation of the arm (9) causes an angular displacement of said blade around the pin (5), which is locked, in the sense of retraction for it, through the tooth (15) defined in the crosshead (13), which has an appendix (18) that emerges outside the body through a defined groove between both leaflets, so that by acting with the same hand that the shear is holding on said appendix (18), the tooth (15) is released from the teeth of the blade (6), and it retracts automatically, due to the effect of the spring (19) , leaving its cutting edge hidden within the said hollow body (1-2).
Solo resta señalar por último que las valvas (1 y 2) tienen orificios (24) pasantes sobre una de ellas y roscados en la otra, para la definitiva fijación de ambas valvas con la colaboración de tornillos, que lo mismo sucede a nivel de la zona extrema de los semibrazos (3-3') y que entre ambos semibrazos queda encajada y fijada una guarnición de goma o caucho (25) que mejora la ergonomía de la herramienta.
It only remains to point out finally that the leaflets (1 and 2) have holes (24) through one of them and threaded in the other, for the definitive fixing of both leaflets with the collaboration of screws, that the same happens at the level of the extreme area of the half-arms (3-3 ') and that between both half-arms a rubber or rubber lining (25) is fitted and fixed that improves the ergonomics of the tool.
Claims
R E I V I N D I C A C I O N E SR E I V I N D I C A C I O N E S
Ia.- Cizalla manual para tubos de plástico, del tipo de las que incorporan un cuerpo hueco a base de dos semivalvas fíjables entre sí, prolongadas en sendos semibrazos que a su vez constituyen en situación de montaje uno de los brazos de la cizalla, y a cuyo cuerpo se une articuladamente el segundo brazo de la misma, y de las que cuentan con una cuchilla que gira sobre un eje establecido entre las dos semivalvas, contando dicha cuchilla con un borde dentado para avance intermitente de la misma, caracterizada porque el citado eje (5) de giro para la cuchilla se materializa en un pasador extraíble, y porque dicha cuchilla (6) incorpora un apéndice (23), en disposición sensiblemente radial y contrapuesta al borde o filo cortante de la misma, colaborando con dicho apéndice un muelle (19) que se acopla ajustadamente en una acanaladura (20) de una de las valvas (1), fijándose por uno de sus extremos a un tetón (21) de la citada valva, mientras que por su otro extremo el citado muelle se remata en un anillo alargado, formal y dimensionalmente adecuado para permitir la entrada y salida del citado apéndice (23) de la cuchilla, todo ello de forma que ésta resulta extraíble y recambiable sin mas que extraer el citado pasador móvil (5), habiéndose previsto que el segundo brazo (9) incorpore, en las proximidades de su eje de basculación (8) con respecto al cuerpo (1-2) de la cizalla, un segundo eje (11) sobre el que bascula una bieleta (12), de configuración acanalada, concretamente de sección en "U", cuya extremidad define un diente (27) de actuación y consecuente empuje sobre el dentado (16) de la cuchilla, bieleta cuya rama media está afectada por una ranura longitudinal y centrada, en la que juega una cruceta (13), montada basculantemente sobre el cuerpo a través de un eje (17) próximo a los ejes (8 y 11) citados, que en oposición a dicho eje (17) cuenta con un diente (15) de actuación sobre el dentado (16) de la cuchilla, que bascula en contra de la tensión de un fleje (14), y que presenta su extremidad libre (18) emergente al exterior a través de una ranura del
cuerpo, para retomo de la cuchilla a su posición de máxima retracción.I a .- Manual shear for plastic tubes, of the type that incorporate a hollow body based on two semi-grapes fixed to each other, prolonged in two half-arms which in turn constitute one of the arms of the shear, and whose body joins the second arm of the same jointly, and of those that have a blade that rotates on an axis established between the two semi-vents, said blade having a serrated edge for intermittent advancement thereof, characterized in that said axis (5) of rotation for the blade is embodied in a removable pin, and because said blade (6) incorporates an appendix (23), in substantially radial arrangement and opposed to the cutting edge or cutting edge thereof, collaborating with said appendix a spring (19) that fits tightly in a groove (20) of one of the leaflets (1), being fixed at one of its ends to a pin (21) of said valve, while at the other end the said wall lle is finished off in an elongated ring, formally and dimensionally suitable to allow the entrance and exit of the aforementioned appendix (23) of the blade, all in such a way that it is removable and replaceable without removing the said movable pin (5), having provided that the second arm (9) incorporates, in the vicinity of its tilting axis (8) with respect to the body (1-2) of the shear, a second axis (11) on which a connecting rod (12) swings , with a ribbed configuration, specifically with a "U" section, whose limb defines a tooth (27) of action and consequent thrust on the teeth (16) of the blade, a connecting rod whose middle branch is affected by a longitudinal and centered groove, in the one that plays a crosshead (13), pivotally mounted on the body through an axis (17) close to the aforementioned axes (8 and 11), which in opposition to said axis (17) has a tooth (15) of action on the teeth (16) of the blade, which tilts against the tension of a strap (14), and having its free end (18) emerging to the outside through a groove of the body, to return the blade to its position of maximum retraction.
2a.- Cizalla manual para tubos de plástico, según reivindicaciones anteriores, caracterizada porque entre los dos semibrazos (3-3') del cuerpo, que al igual que las dos semivalvas se fijan entre sí mediante tornillos, se establece una guarnición (25) de un material blando, preferentemente de caucho.
2 .- Manual shears plastic tubes, according to previous claims, characterized in that between the two partial arms (3-3 ') of the body, like the two clam shell halves are fixed together by screws, a side set (25 ) of a soft material, preferably of rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/ES2009/000124 WO2010103131A1 (en) | 2009-03-09 | 2009-03-09 | Manual shears for plastic tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/ES2009/000124 WO2010103131A1 (en) | 2009-03-09 | 2009-03-09 | Manual shears for plastic tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2010103131A1 true WO2010103131A1 (en) | 2010-09-16 |
Family
ID=42727820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/ES2009/000124 WO2010103131A1 (en) | 2009-03-09 | 2009-03-09 | Manual shears for plastic tubes |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2010103131A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107081468A (en) * | 2017-05-10 | 2017-08-22 | 上海灿裕贸易有限公司 | Pipe shearing device structure |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3210844A (en) * | 1962-10-08 | 1965-10-12 | Tontscheff Todor Kaniov | Cutting pliers |
| US4312127A (en) * | 1979-08-23 | 1982-01-26 | Hanazono Kogu Kabushiki Kaisha | Cutting tool |
| US4674184A (en) * | 1986-03-13 | 1987-06-23 | Milbar Corporation | Cutting tool for synthetic resin tubes |
| FR2698570A1 (en) * | 1992-12-02 | 1994-06-03 | Virax Sa | Tube cutter with single cutting blade for plastic tubes with high deg. of elasticity - has blade actuated by ratchet mechanism with drive and non-return pawls |
| US5718051A (en) * | 1997-01-21 | 1998-02-17 | Huang; Chi-Chieh | Pipe cutter having an adjustable moving stroke |
| US20080307657A1 (en) * | 2007-06-14 | 2008-12-18 | Emerson Electric Co. | Ratcheting hand tool with easily replaceable cutting blade |
-
2009
- 2009-03-09 WO PCT/ES2009/000124 patent/WO2010103131A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3210844A (en) * | 1962-10-08 | 1965-10-12 | Tontscheff Todor Kaniov | Cutting pliers |
| US4312127A (en) * | 1979-08-23 | 1982-01-26 | Hanazono Kogu Kabushiki Kaisha | Cutting tool |
| US4674184A (en) * | 1986-03-13 | 1987-06-23 | Milbar Corporation | Cutting tool for synthetic resin tubes |
| FR2698570A1 (en) * | 1992-12-02 | 1994-06-03 | Virax Sa | Tube cutter with single cutting blade for plastic tubes with high deg. of elasticity - has blade actuated by ratchet mechanism with drive and non-return pawls |
| US5718051A (en) * | 1997-01-21 | 1998-02-17 | Huang; Chi-Chieh | Pipe cutter having an adjustable moving stroke |
| US20080307657A1 (en) * | 2007-06-14 | 2008-12-18 | Emerson Electric Co. | Ratcheting hand tool with easily replaceable cutting blade |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107081468A (en) * | 2017-05-10 | 2017-08-22 | 上海灿裕贸易有限公司 | Pipe shearing device structure |
| CN107081468B (en) * | 2017-05-10 | 2020-01-07 | 上海灿裕贸易有限公司 | Pipe shearing device structure |
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