ES2323426T3

ES2323426T3 - TOOL DRIVEN BY MOTOR, WITH A LOCK / UNLOCK DEVICE FOR THE SPINDLE.

Info

Publication number: ES2323426T3
Application number: ES05750161T
Authority: ES
Inventors: Jorg Seyerle
Original assignee: Metabowerke GmbH and Co
Current assignee: Metabowerke GmbH and Co
Priority date: 2005-05-14
Filing date: 2005-05-14
Publication date: 2009-07-15
Anticipated expiration: 2025-05-14
Also published as: EP1881883B1; EP1881883A1; CN101175610A; DE502005007214D1; ATE430000T1; WO2006122571A1

Abstract

The invention relates to a motor-driven or battery-powered machine-tool, in particular a hand machine-tool, such as a drill, a percussion drill, a hammer drill or a screwdriver. Said machine-tool comprises a machine casing, a driving motor, a spindle (2) which can be driven by the driving motor, whereby a locking/releasing device is provided between the driving motor and the spindle (2), which comprises a motor-sided driving element, a spindle-sided driven element (4), rotationally fixed to or integrally joined to said spindle (2) and at least one clamping body (6), and said machine-tool comprises a chuck for clamping a tool, which can be connected to the spindle (2), whereby said spindle (2) can be locked in relation to the machine casing (12) by application of a torque, acting from the chuck in the direction of the driving motor and can rotate freely in relation to the machine casing (12) by application of a torque, acting from the driving motor in the direction of the spindle (2). In order to make said machine-tool more convenient to operate, the clamping body (6) abuts against a component (8) during locking of the spindle (2), which is connected to the machine casing (2) through a damping means (18) with limited deformation.

Description

Herramienta accionada por motor, con un dispositivo de bloqueo/desbloqueo para el husillo.Motor driven tool, with a locking / unlocking device for the spindle.

La presente invención se refiere a una herramienta accionada por motor, especialmente a una herramienta de mano, también accionada por acumulador, como una taladradora, una taladradora percutora, un martillete de taladrar o una atornilladora, con las características del preámbulo de la reivindicación 1.The present invention relates to a motor driven tool, especially a tool hand, also operated by accumulator, such as a drill, a hammer drill, a hammer drill or a screwdriver, with the characteristics of the preamble of the claim 1.

Una herramienta de este tipo se conoce por el documento US2002/0130007A1.Such a tool is known by the US2002 / 0130007A1.

Las herramientas con un dispositivo de bloqueo/desbloqueo para el husillo (parada automática de husillo) se ha dado a conocer en múltiples ocasiones, por ejemplo, por los documentos DE 19942271A1, DE 10338608B, DE 10336637B, DE 10316889, DE 19608499A1, EP 0982103B1.The tools with a device spindle lock / unlock (automatic spindle stop) it has been released on multiple occasions, for example, by documents DE 19942271A1, DE 10338608B, DE 10336637B, DE 10316889, DE 19608499A1, EP 0982103B1.

Si al desconectar el accionamiento por motor de estas herramientas se activa el dispositivo de bloqueo/desbloqueo por el seguimiento del mandril con el útil insertado, debido a que el cuerpo de apriete se pone en una posición de bloqueo por apriete, la inmovilización del husillo conlleva un ruido y un choque que el usuario oye y siente de manera desventajosa.If when disconnecting the motor drive from These tools activates the lock / unlock device by tracking the mandrel with the tool inserted, because the tightening body is put in a locked position by tighten, the immobilization of the spindle entails a noise and a crash that the user hears and feels disadvantageously.

La presente invención tiene el objetivo de contrarrestar esto y seguir mejorando la herramienta genérica.The present invention has the objective of Counteract this and continue to improve the generic tool.

Según la invención, en una herramienta del tipo mencionado, este objetivo se consigue de tal forma que el componente comprende al menos un apéndice que se extiende en el sentido radial y que entra en una cavidad de la carcasa de la máquina, realizada algo más grande en el sentido circunferencial, y que coopera con la carcasa de la máquina limitando el giro, y que forma un tope duro, efectivo en el sentido circunferencial, que mediante el contacto contra la carcasa de la máquina limita una movilidad del componente.According to the invention, in a tool of the type mentioned, this objective is achieved in such a way that the component comprises at least one appendix that extends in the radial direction and entering a cavity of the housing of the machine, made somewhat larger in the circumferential sense, and which cooperates with the machine housing by limiting the rotation, and that forms a hard butt, effective in the circumferential sense, which by contacting the machine housing it limits a component mobility.

Por lo tanto, según la invención se propone que el cuerpo de apriete no se aplique directamente contra un componente totalmente fijo a la carcasa y no se inmovilice bruscamente, ni se inmovilice bruscamente el husillo de accionamiento o su pieza de salida con respecto a la carcasa de la máquina, sino que, intercalando un medio de amortiguación, se prevé un componente que se puede mover de forma limitada con respecto a la carcasa de la máquina y contra el que se aplica el cuerpo de apriete.Therefore, according to the invention it is proposed that the tightening body does not apply directly against a component completely fixed to the housing and does not freeze abruptly, do not abruptly immobilize the spindle of drive or its output part with respect to the housing of the machine, but, by inserting a damping means, it is foreseen a component that can move in a limited way with respect to the machine housing and against which the body of squeeze in.

El componente puede hacerse girar de forma limitada con respecto a la carcasa de la máquina, preferentemente en ambos sentidos de giro. Tiene, especialmente, forma anular. Además, se propone que el componente esté alojado de forma giratoria (limitadamente) por la carcasa de la máquina o por un componente de la carcasa de la máquina.The component can be rotated so limited with respect to the machine housing, preferably in both directions of rotation. It has, especially, annular shape. In addition, it is proposed that the component be housed rotating (limitedly) by the machine housing or by a machine housing component.

El medio de amortiguación puede estar configurado de cualquier manera. Podría tratarse de un medio de resorte. De manera ventajosa, se usa un material elástico, especialmente un cuerpo de goma. El medio de amortiguación puede presentar, de manera ventajosa, una dureza Shore de 30 a 80 Shore A.The damping medium may be configured in any way. It could be a means of spring. Advantageously, an elastic material is used, especially a rubber body. The damping medium can present, advantageously, a Shore hardness of 30 to 80 Shore TO.

El acoplamiento del componente con la carcasa de la máquina mediante el medio de amortiguación mencionado puede estar configurado de cualquier manera, aunque ha resultado ser conveniente disponer el medio de amortiguación en el sentido radial entre el componente y la carcasa de la máquina. También es posible y ventajoso que estén previstos varios medios de amortiguación en diferentes lugares, por ejemplo, en lugares diametralmente opuestos o en lugares desplazados 120º en el sentido circunferencial.The coupling of the component with the housing the machine by means of the mentioned damping means can be configured in any way, although it has turned out to be convenient to arrange the damping means in the radial direction between the component and the machine housing. It is also possible and advantageous that several damping means are provided in different places, for example, in diametrically opposite places or in places displaced 120º in the circumferential sense.

Se pueden prever varios topes para la introducción homogénea de fuerzas.Several stops can be provided for homogeneous introduction of forces.

En total, con una configuración según la invención, una inmovilización dura del husillo de la herramienta que puede ser percibida como ruidosa y desagradable, puede sustituirse por una inmovilización amortiguada del husillo, que ya no se siente ni oye apenas. De esta forma, se reduce también el riesgo de que un mandril se pueda soltar accidentalmente.In total, with a configuration according to invention, a hard immobilization of the tool spindle which can be perceived as loud and unpleasant, can be replaced by a damped spindle immobilization, which already He does not feel or hear hardly. In this way, the risk that a mandrel could be accidentally released.

Cabe señalar también que la invención resulta ventajosa precisamente en herramientas eléctricas de mano, accionadas por acumulador, especialmente con un engranaje planetario, porque en este caso el problema descrito al principio es especialmente pronunciado.It should also be noted that the invention results advantageous precisely in hand tools, accumulator driven, especially with a gear planetary, because in this case the problem described at the beginning It is especially pronounced.

Más características, detalles y ventajas de la invención resultan de las reivindicaciones adjuntas y del dibujo y la siguiente descripción de la invención. En el dibujo muestra:More features, details and advantages of the invention results from the appended claims and the drawing and The following description of the invention. In the drawing it shows:

La figura una representación esquemática de un dispositivo de bloqueo / desbloqueo configurado según la invención, para una herramienta de mano.The figure shows a schematic representation of a locking / unlocking device configured according to the invention, For a hand tool.

La única figura representa esquemáticamente el principio del dispositivo de bloqueo / desbloqueo (retención de husillo) configurado según la invención, en una herramienta de mano. Se indica esquemáticamente un husillo 2 en el que puede disponerse de forma resistente al giro un mandril no representado, destinado a recibir una herramienta. El husillo 2 constituye una pieza de salida situada en el lado del husillo, o bien, está unida de forma resistente al giro y rígida con una pieza de salida 4 de este tipo, situada en el lado del husillo. Entre el husillo 2 ó la pieza de salida 4 situada en el lado del husillo está previsto un cuerpo de apriete 6 alojado en un espacio entre el husillo 2 y un componente 8 cerrado en el sentido circunferencial formando un anillo de frenado 10 fijo a la máquina. Por el signo de referencia 12 está designada una carcasa de máquina o un componente de la carcasa de máquina de la herramienta. El componente 8 que actúa como anillo de frenado 10 comprende un saliente 14 radial que entra en una cavidad 16 de la carcasa 12 de máquina, realizada algo más grande en el sentido circunferencial. En el sentido radial entre el saliente 14 y la carcasa de máquina 12 está previsto un medio de amortiguación 18 de un material elastómero 20. El medio de amortiguación 18 está alojado en cavidades 22 conformadas de forma complementaria en el saliente 20 ó 24 en la carcasa 12 de la máquina. Forma un acoplamiento deformable limitadamente entre el componente 8 y la carcasa 12 de la máquina. Si durante la aplicación del cuerpo de apriete 6 al iniciarse un par de giro por el husillo 2 en dirección hacia el motor de accionamiento no representado (flecha 26) se ejerce un par de giro sobre el componente 8 en la dirección de la flecha 28, el medio de amortiguación 18 se deforma y al mismo tiempo está sometido a cizallamiento. No obstante, permite un ligero movimiento del componente 28 en la dirección de la flecha 28. Este ligero movimiento, sin embargo, está limitado definitivamente por superficies de tope 30 que actúan en el sentido circunferencial entre el saliente 14 y la cavidad 16.The only figure schematically represents the principle of locking / unlocking device (retention of spindle) configured according to the invention, in a hand tool. A spindle 2 is indicated schematically in which it can be arranged a mandrel not shown, intended for rotation Receive a tool. Spindle 2 constitutes a piece of outlet located on the side of the spindle, or, is connected in a way resistant to rotation and rigid with an output piece 4 of this type, located on the side of the spindle. Between spindle 2 or the piece of outlet 4 located on the side of the spindle is provided a body of tighten 6 housed in a space between spindle 2 and a component 8 closed in the circumferential direction forming a ring of 10 braking fixed to the machine. By reference sign 12 is designated a machine housing or a housing component of machine tool. The component 8 that acts as a ring of braking 10 comprises a radial projection 14 entering a cavity 16 of the machine housing 12, made somewhat larger in the circumferential sense. In the radial direction between the projection 14 and the machine housing 12 is provided with a damping means 18 of an elastomeric material 20. The damping means 18 is housed in cavities 22 formed in a complementary manner in the projection 20 or 24 in the housing 12 of the machine. Form a deformable coupling limitedly between component 8 and the machine housing 12. If during the application of the body of press 6 when a torque is started on spindle 2 in the direction towards the drive motor not shown (arrow 26) exerts a torque on component 8 in the direction of the arrow 28, the damping means 18 deforms and at the same time It is subjected to shear. However, it allows a slight movement of component 28 in the direction of arrow 28. This slight movement, however, is definitely limited by stop surfaces 30 acting in the circumferential direction between projection 14 and cavity 16.

Mediante la disposición del medio de amortiguación 18 se puede conseguir una inmovilización silenciosa y en gran medida exenta de choques y, a pesar de ello, muy rápida, del husillo.Through the provision of the means of cushioning 18 silent immobilization can be achieved and largely free of shocks and, nevertheless, very fast, of spindle

Claims

1. Motor driven tool, especially hand tool, also powered by accumulator, such as a drill, a hammer drill, a hammer drill or a screwdriver, with a machine housing, a drive motor, a spindle (2) that it can be driven by the drive motor, a locking / unlocking device being provided between the drive motor and the spindle (2) with a drive part located on the motor side, with an outlet part (4) located in the spindle side and joined in a twist-resistant way or in one piece with the spindle (2), and with at least one tightening body (6), and with a mandrel that can be attached with the spindle (2) to hold a tool, the spindle (2) can be immobilized with respect to the casing (12) of the machine at the beginning of a torque that acts from the mandrel in the direction of the drive motor, and can rotate freely with respect to the casing (12 ) of maq when a torque is started acting from the drive motor in the direction of the spindle (2), the clamping body (6) being applied, during the immobilization of the spindle (2), against a component (8) connected with the housing (12) of the machine through a damping means (18) that is limitedly deformable, characterized in that the component (8) comprises at least one appendix (14) extending in the radial direction and entering a cavity (16) of the casing (12) of the machine, made somewhat larger in the circumferential direction, and cooperating with the casing (12) of the machine limiting the rotation and forming a hard stop (30), effective in the circumferential direction, which by means of the contact against the casing (12) of the machine limits the mobility of the component (8).

2. Tool according to claim 1, characterized in that the component (8) can rotate limitedly with respect to the casing (12) of the machine.

3. Tool according to claim 2, characterized in that the component (8) can rotate both ways with respect to the casing (12) of the machine.

4. Tool according to claim 1, 2 or 3 characterized in that the component (8) has an annular shape.

5. Tool according to claim 2, 3 or 4, characterized in that the component (8) is housed by the machine casing or by a machine casing component (12), being able to rotate limitedly.

6. Tool according to one of the preceding claims, characterized in that the damping means (18) comprises a rubber body (20).

7. Tool according to one of the preceding claims, characterized in that the damping means (18) has a Shore hardness of 30 to 80 Shore A.

Tool according to one of the preceding claims, characterized in that the damping means (18) is subjected to shear during immobilization.

Tool according to one of the preceding claims, characterized in that the damping means (18) is arranged radially between the component (8) and the casing (12) of the machine.