GB2462366A

GB2462366A - Jigsaw with protective device

Info

Publication number: GB2462366A
Application number: GB0913529A
Authority: GB
Inventors: Hans Kaiser; Marcel Casota; Jingying Zhao
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2008-08-07
Filing date: 2009-08-03
Publication date: 2010-02-10
Also published as: CN101642832A; GB0913529D0; DE102008041095A1; RU2009130129A

Abstract

A hand-held power tool, such as a jigsaw 12, comprises at least one protective device 16 for at least partly guarding a reciprocating means 14, where the protective device is arranged at least partly movably. Preferably, the tool has a tool holding means 20, and at least one actuating unit 22 for locking/unlocking the holding means. The actuating unit and the protective device may be formed at least partly in one piece. In at least one operating state, two differing, circumferentially covering components (30, 32, fig 1) may be arranged on the reciprocating and/or holding means. One of the two covering components may be moveable and other may be fixed. Preferably, the protective device has at least two grating regions (34, 36, 38, 40, fig 1) which are arranged on different radii (42, 44, 46, fig 1) and which cover at least 180° of circumference of the reciprocating and/or holding means.

Description

Hand-held power tool

Prior art

The invention starts from a hand-held power tool, in particular a jigsaw, according to the precharacterising clause of Claim 1.

A hand-held power tool, in particular a jigsaw, having a reciprocating means and having at least one protective device for at least partly guarding the reciprocating means has already been proposed.

Advantages of the invention The invention starts from a hand-held power tool, in particular a jigsaw, having a reciprocating means and having at least one protective device for at least partly guarding the reciprocating means.

It is proposed that the protective device is arranged at least partly movably. In this context, a "reciprocating means" is to be understood as meaning in particular an element, such as, for example, a reciprocating rod, which, in at least one operating state of the hand-held power tool, is driven in an upward and downward movement, in particular a continuous upward and downward movement, preferably by a drive means, such as a motor. Furthermore, the reciprocating means constitutes a holding means for a tool. A "protective device for at least partly guarding the reciprocating means" is to be understood here as meaning in particular a device which surrounds preferably at least 90°, advantageously at least 180° and particularly preferably more than 215°, of a circumference of the reciprocating means, and/or which protects the reciprocating means from an external access and/or by means of which an access, in particular a manual access of an operator, to the reciprocating means can be prevented.

However, in principle, a covering of 360° would also be suitable. The protective device may, for example, be formed in the shape of a plate, a cylinder and/or particularly advantageously in the form of a grating. However, the configuration in another form which appears appropriate to a person skilled in the art would also be conceivable. The protective device is preferably produced from plastic, but a production from another material, such as, for example, metal, would also be conceivable. The term "movably" in this case defines a movement in at least one direction, such as an upward and/or downward movement and/or particularly preferably in a rotary movement. The phrase "at least partly" in this case means in particular that, in the case of a multipart design of the protective device, only one part of the components can be movably arranged. By virtue of the configuration according to the invention, a flexible protective device can be formed, which can advantageously perform further functions in a constructionally simple manner owing to its movability.

Furthermore, there is proposed a hand-held power tool having a drive unit having a holding means, at least one actuating unit for locking and/or unlocking at least the holding means, in particular for a tool, and having at least one protective device for at least partly guarding the holding means, the actuating unit and the protective device being at least partly operatively coupled. In this context, a "drive unit" is to be understood as meaning in particular a unit having a motor and a holding means, the motor, in at least one operating state of the hand-held power tool, driving a further component, such as a reciprocating means, in an upward and downward movement, in particular a continuous or periodic upward and downward movement. A "holding means" is to be understood here as meaning in particular a means, such as, for example, a tool holding fixture, which is provided for a fastening and/or locking of the tool and/or is formed, for example, by a reciprocating means. An "actuating unit" here constitutes in particular a unit having, for example, an operating element, such as a push-button switch and/or an operating lever and/or a place of interaction and/or another element which appears expedient to a person skilled in the art, by means of which the holding means or a holding mechanism, such as, in particular, a clamping mechanism for the tool, can be operated and/or in particular locked and/or unlocked. A "protective device for at least partly guarding the holding means" is to be understood here as meaning in particular a device which surrounds preferably at least 90°, advantageously at least 180° and particularly preferably more than 215°, of a circumference of the holding means, and/or which protects the holding means from an external access and/or by means of which an access, in particular a manual access of an operator, to the holding means can be prevented. In this context, "operatively coupled" is to be understood as meaning in particular that a movement of the actuating unit relative to the holding means leads to a movement of the protective device relative to the holding means and/or that a direct force flow from the actuating unit to the protective device takes place.

The phrase "at least partly" here means in particular that advantageously 50%, preferably 80% and particularly preferably more than 95%, of the action of the actuating unit can be transmitted to the protective device. By virtue of the coupling of the actuating unit and the protective device, an efficient and/or constructionally simple construction of the hand-held power tool can be formed.

Furthermore, it is advantageous when an operating element of an actuating unit is arranged on the protective device, with the result that a particularly constructionally simple operation of a locking and unlocking mechanism of the holding means is obtained.

Advantageously, there is provided an actuating unit which is formed at least partly in one piece with the protective device. In this context, "in one piece" means in particular that the actuating unit can be separated from the protective device only with loss of function. The actuating unit can in this case be connected to the protective device by all kinds of materially united connections which appear appropriate to a person skilled in the art, such as, for example, an adhesive bonding, a welding, a sintering, a soldering, an injection moulding and/or a casting. The phrase "at least partly" in this case defines that at least one component, such as, for example, the operating lever of the actuating unit, is formed in one piece with the protective device. By virtue of the one-piece design, the actuating unit can be realised in a component-saving manner.

In a further configuration of the invention, it is proposed that the protective device has at least one region of interaction with a locking and/or unlocking rnechani-srn of an actuating unit. In this context, a "region of interaction" is to be understood as meaning in particular a region which preferably interacts with a place of interaction, such as, for example, an actuator in the form of an operating projection and/or another means which appears appropriate to a person skilled in the art, preferably arranged on the holding means, by means of a contact without touching and/or in particular mediated by touching. The "locking and/or unlocking mechanism" here constitutes in particular an inactivation and/or deactivation, for example, of the clamping mechanism of the holding means for the tool by a rotary movement of the protective device, in the case of which, for example, an unlocking takes place by an anticlockwise rotation, when seen from the point of view of the operator in the direction from a handle to a guide unit, which is provided for a guidance of the hand-held power tool on a workpiece. By virtue of the realisation of the region of interaction, a reliable operation of the locking and/or unlocking mechanism can be provided. In addition, a manual actuation by the operator can be dispensed with, which is beneficial from the point of view of safety.

Furthermore, it may be advantageous when, in at least one operating state, two differing, circumferentia]-lY covering components are arranged on the holding and/or reciprocating means. In this case, "two differing, circumfereritially covering components" are to be understood as meaning in particular two components of the protective device which are preferably designed differently to one another and which, in the operating state of a working mode, cover and/or extend over different angular regions of in each case at least 90°, advantageously of at least 120° and particularly preferably of at least more than 130°, of the circumference of the holding means. The components may cover angular regions of the circumference of identical or different size. Here, "arranged on the holding and/or reciprocating means" is to be understood as meaning in particular a radius around an axis of the holding means or of the reciprocating means of less than 3 cm. By virtue of the configuration according to the invention, a high degree of safety in the working mode of the hand-held power tool can be provided.

A particularly advantageously space-saving protective device can be achieved when the two components are arranged movably relative to one another. In this case, "movably" is preferably to be understood as meaning rotatably. In addition, it is proposed that one of the components is arranged movably and the other component is arranged fixedly. In this case, "movably" defines in particular that one of the components is arranged movably in relation to a housing or the reciprocating means and "fixedly" in particular that the other component is arranged fixedly in relation to the housing. By virtue of this differing arrangement, a good operability coupled with good protection can be realised.

Furthermore, it is proposed that the protective device has at least two grating regions which are arranged on different radii. In this case, a "grating region" is to be understood as meaning in particular a region of the protective device which is a constituent of a grating, a "grating" here defining in particular a structure which has at least three crosspieCeS and/or bars which are preferably arranged substantially parallel to one another and/or of which two and/or preferably all three are connected to one another at least on one side. Here, "arranged on different radii" is to be understood as meaning in particular that although the grating regions are arranged coaxially with respect to an axis of longitudinal extent of the holding means or of the reciprocating means, they have different radii or distances from this axis of the holding means. The two grating regions which are arranged on different radii are preferably arranged on the fixedly and/or movably arranged component, it being possible for both grating regions to be arranged on the same component and/or on different components. The two components thus form a cage-like grating structure in at least one operating state, preferably during the working mode of the hand-held power tool. By virtue of the arrangement on different radii, a space-saving covering of the reciprocating means or of the holding means can be provided. Furthermore, the protective device is designed advantageously with a clear arrangement.

In addition, an appropriate space for the place of interaction on the holding means or on the reciprocating means can be thereby realised in a constructionally simple manner.

A preferred development consists in that one of the components, in at least one operating state, covers at least a part of the other component. In this case, the operating state is preferably an operating state of a tool change or during the locking and/or unlocking of the holding means. A covering region here is to amount to preferably at least 30%, preferably 60% and particularly preferably more than 80%, of the covered component, which is preferably the fixedly arranged component, and is achieved by a procedure of a rotation of the movable component relative to the fixed component. A covering can take place without hindrance owing to the arrangement of the components on different radii around the holding means and/or owing to a different axial length of the components.

By virtue of the realisation of the covering, the locking and/or unlocking mechanism can be designed in a constructionally simple and operator-friendly manner. In addition, a compact construction of the actuating unit or of the protective device, which moreover is designed in a space-and component-saving manner, can be provided.

In addition, it is provided that the fixedly arranged and the movably arranged component, in at least one operating state, cover at least 180° of a circumference of the holding and/or reciprocating means and advantageously at least 200° and particularly preferably at least more than 215°. In this case, the operating state is preferably a working mode of the hand-held power tool. By virtue of this arrangement around the holding means or reciprocating means, a sufficient and efficient protection can be achieved.

It is further proposed that there is provided a unit which couples the fixedly arranged component and the movably arranged component to one another. In this context, a "unit for coupling to one another" is to be understood as meaning in particular a unit, such as a coupling unit and/or a fastening unit, by means of which the two components can be operatively coupled and/or fastened to one another and/or supported by means of the weights. This coupling can take place by means of any kinds of fastening which appear appropriate to a person skilled in the art, such as a non-positive connection and/or a materially united connection and/or particularly preferably a positive connection. The unit for coupling the fixedly arranged and the movably arranged component and these two components themselves form, for example, a subassembly which can be connected to the housing of the hand-held power tool and/or advantageously the coupling unit is formed in one piece with the housing or with at least one housing shell and/or particularly advantageously the coupling unit is of two-part design, each part being formed in one piece with a housing shell. With this unit, a secure fastening of the two components in a constructionally simple manner can be achieved.

Advantageously, at least one component forms at least one guide for at least one guide section of the protective device. A "component forming a guide" is to be understood here as meaning in particular an element, such as a bearing surface, for example a wall and/or in particular a recess in the form of a channel, which forms a guide for another component, such as, for example, one of the components of the protective device and/or of the unit for coupling the two components, and/or prescribes and/or determines a path of a component. A "guide section" in this case defines in particular a mating contour with respect to the guide. The component can also be designed in one piece with the unit for coupling the two components of the protective device.

By means of the coordinated guide elements, a frictionless rotary movement of the two components of the protective device can be produced simply and efficiently.

Furthermore, it is advantageous when at least one component has a curved path for a guidance of another component in at least one operating state. A "curved path" is to be understood here as meaning in particular a path, in particular a recess with guide surfaces, which has a curved section and/or is formed particularly advantageously by a circular path or a part thereof. In this case, the other component is preferably guided in the curved path in an operating state of a tool change or during the locking and/or unlocking of the holding means. "Another component" is, for example, a component of the unit for coupling the two components of the protective device and/or the movably mounted component and/or another component which appears expedient to a person skilled in the art. By virtue of the curved path, a particularly exact guidance can be provided.

Furthermore, the rotary movement of the movable component can be limited in a constructionally simple manner by an end region or stop of the curved path.

In a further configuration of the invention, there is proposed a return unit, via which the movably arranged component is operatively connected to a further component.

In this context, a "return unit" is to be understood here as meaning in particular a unit, such as an elastic element and/or in particular a spring, which is provided for storing an energy and converting this into an action again.

An "operative connection" here defines in particular a connection, such as an indirect connection and/or in particular a contact-mediated connection, via which an action, such as a movement, is imparted. A "further component" is, for example, a component of the unit for coupling the two components of the protective device and/or the fixedly arranged component, although any other component which appears appropriate to a person skilled in the art would also be conceivable. By virtue of the return unit, a cost-effective, space-saving and constructionally simple mechanism for a cancellation of a locking and/or unlocking position of the actuating element can be realised. If the return unit is designed as a spring, a particularly light construction of the locking and/or unlocking mechanism can be provided.

Drawing Further advantages emerge from the following description of the drawing. n exemplary embodiment of the invention is illustrated in the drawing. The drawing, description and claims contain numerous features in combination. A person skilled in the art will also consider the features, expediently, individually and combine them to form appropriate further combinations.

In the drawing: Fig. 1 shows a schematic illustration of a jigsaw having a protective device according to the invention, Fig. 2 shows the protective device from Figure 1 in a perspective illustration, Fig. 3 shows a component of the protective device from Figure 2 in a detail illustration, Fig. 4 shows the protective device from Figure 2 in a position arranged around a holding means, and Fig. 5 shows the protective device from Figure 2 in a position for unlocking a tool.

Description of the exemplary embodiment

Figure 1 shows a hand-held power tool 10 in the form of a jigsaw 12 having a housing 68, in which a drive motor 70 is arranged and which has a handle 72. Furthermore, the jigsaw 12 has a drive unit 18, such as a pendulum gearing 76, which is arranged in a gearing compartment 74 and which imparts a reciprocating movement in a reciprocating direction 78 and thereby drives a reciprocating means 14, such as a reciprocating rod 80, which carries a tool 24 in the form of a saw blade 82, in a continuous upward and downward movement in a working mode of the jigsaw 12. The reciprocating means 14 is also designed as a holding means 20, which has a tool holding fixture 84 for the tool 24. In addition, an actuating unit 22 for locking and/or unlocking the holding means 20 or the holding mechanism of the tool 24, and a protective device 16 for partly guarding the reciprocating means 14 or the holding means 20 is arranged in a front region 88 of the hand-held power tool 10, when seen in the working direction 86. The actuating unit 22 and the protective device 16 are partly operatively coupled, the protective device 16 being arranged partly movably.

Figure 2 shows the protective device 16 in a detail illustration. The protective device 16 has, in at least one operating state, such as the working mode of the hand-held power tool 10 or during a sawing process, two differing, circumferentially covering components 30 and 32 which are arranged on the holding means 20 oron the reciprocating means 14 (see Figures 1 and 4) . The component 30 is arranged movably in relation to the housing 68 and the component 32 is arranged fixedly in relation to the housing 68, with the result that the two components 30, 32 are arranged movably relative to one another. The fixedly arranged component 32 and the movably arranged component 30 form, in the working mode of the jigsaw 12, a cage-like grating structure 90 composed of two gratings 92, 94. In the working mode of the hand-held power tool 10, the grating structure 90 covers approximately 220° of a circumference 50 of the reciprocating means 14 or of the holding means 20. It extends substantially parallel to an axis 96 of the reciprocating means 14 (not shown here) from inside the housing 68 in the direction of a guide unit 98, which is provided for a guidance of the hand-held power tool 10 on a workpiece 100 and is designed in the form of a slide shoe 102, about 40% of the grating structure 90 extending outside the housing 68 up to about 1 cm beyond an end 104 of the reciprocating means 14 (see Figure 1 and 4) In this case, the components 30, 32 have differing covering regions directly adjoining one another, an angular region of the component 30 being about 130° and an angular region of the component 32 being approximately 90°. The protective device 16 or the two gratings 92, 94 have a curved shape and in addition four grating regions 34, 36, 38, 40 which are arranged on different radii 42, 44, 46 and coaxially with respect to the axis 96 of the reciprocating means 14.

In this case, the component 32 forms the grating region 34, which has three grating crosspieces 106 which are connected at one of their end regions 108 via a connecting beam 110 extending in the reciprocating direction 78, are arranged substantially parallel to one another and thus form an E-shape. The grating region 34 is arranged on a substantially uniform radius 42 which is the smallest radius in comparison with the radii 44 and 46. The component 30 has, in contrast, three grating regions 36, 38, 40, which are arranged on the different radii 42, 44 and 46, the radius 44 being greater than the radius 42, but less than the radius 46. The grating region 40 is formed by three sides 112, 114, 116 of a quadrangular border 118 and is arranged on the radius 44 (see also Figure 3) . A grating crosspiece 120, which connects two sides 112, 114, extending in the reciprocating direction, of the border 118 and extends parallel to the side 116, forms the grating region 38. In addition, the grating region 38 runs in an arc 122 arranged with the radius 46, the arc 122 extending outwards from a surface 124, facing away from the reciprocating means 14, of the grating region 40 in a substantially perpendicular direction 126 to the reciprocating means 14, so that there is room radially between the reciprocating means 14 and the grating crosspiece 120 for an operating projection 128 for locking and/or unlocking the release mechanism of the tool 24 (see also Figure 3 and 4) . The grating region 36 lies, relative to the grating web 120, opposite the sides 112, 114 and forms a fourth side 130 of the border 118 and extends, arranged like the component 32 on the radius 42, inwards from a surface 132, facing the reciprocating means 14, of the grating region 40 in the substantially perpendicular direction 126 to the reciprocating means 14.

Figure 3 shows the component 30 of the protective device 16 in a detail illustration. An operating element 26 of the actuating unit 22 is arranged on the protective device 16 on the surface 124, facing away from the reciprocating means 14, of the side 112 directly below the side 116 in the direction of the grating crosspiece 120 or the side 130, with the result that the actuating unit 22 is formed at least partly in one piece with the protective device 16.

The operating element 26 is formed by an operating lever 134, which points outwards from the surface 124 of the grating region 40 in the direction of an inner surface (not shown) of the housing 68 and reaches through an opening 136 in the housing 68 or into a reciprocating-rod cover 138 (see Figure 1) . By an anticlockwise actuation of the operating lever 134 in a circumferential direction 140 of the holding means 20 or a thereby imparted rotary movement of the protective device 16, when seen from the point of view of the operator from the handle 72 to the guide unit 98, an operator can unlock, for example, the holding mechanism of the saw blade 82. Furthermore, the protective device 16 has a region of interaction 28, designed as an additional operating element 26, with a locking and/or unlocking mechanism of an actuating unit 22. This region of interaction 28 is arranged approximately at a level of a place of emergence 142 of the grating crosspiece 120 and is formed by a lateral surface 144, facing in the direction of the side 114, of the side 112. Upon a rotation of the movable part 30, the region of interaction 28 makes a direct contact with an actuator or a place of interaction 146 in the form of the operating projection 128 on the holding means 20 for unlocking the tool holding fixture 84 (see below, Figure 4) On the surface.132, facing the reciprocating means 14, of the grating region 40 opposite the operating element 26 or the operating lever 134, the component 30 has a connecting web 150 facing inwards in the radial direction 148, on which a ring segment 152 extending over about 180° is arranged, one subsegment 154 extending with an angular region of about 65° clockwise and another subsegment 156 extending with an angular region of about 115° anticlockwise (see Figure 2) The protective device 16 further has a unit 52 in the form of a coupling unit 158, which couples the fixedly arranged component 32 and the movably arranged component 30 to one another (see Figure 2) . This unit 52 is formed by two components 54 and 56, the component 54 being formed in one piece with a first housing shell 160 and the component 56 being formed in one piece with a second housing shell 162 (see Figure 1 and regions illustrated in section in Figure 2) . For a better understanding, the two components 54 and 56 are described here as a uniform functional unit. The' unit 52 has a ring-segment-shaped plate 164, which extends over a circular arc of about 230° and at the inner edge 166 of which a circular shoulder 168 extends. Parallel to this shoulder 168, a part-circular shoulder 170 extending over an angular region of about 225° is arranged on the plate 164. At an end 172, arranged in the circumferential direction 140, of the plate 164 there is arranged a web 174 which points outwards in the radial direction 148 and from which extend two further shoulders 176 and 178 which are also arranged parallel to the circular shoulder 168. In addition, a positioning point 180 of the web 174 subdivides the shoulder 170 into two parts 182, 184 of approximately equal size. The shoulder 176 extends like the part 182 of the section 170 over an angular region of about 115° and ends, in the circumferential direction 140 of the plate 164, at the same circumferential level as the part-circular shoulder 170. The shoulder 178 in turn extends approximately over the entire extent of the plate 164, the section 178 being arranged at a distance 186 from an outer edge 188 of the plate 164 (see Figure 4) . All four shoulders 168, l7D, 176, 178 extend coaxially with respect to the axis 96 of the reciprocating means 14 and, in an assembled state, in the reciprocating direction 78 or in a direction facing the housing 68.

In the assembled state of the components 30, 32 and of the unit 52, and in the working position of the jigsaw 12, the ring segment 152 of the component 30 bears against the circular shoulder 168 of the unit 52 and encloses 1800 of the shoulder 168 or the part of the shoulder 168 integrally formed on the component 56, an end 190 of the subsegment 154 being arranged at the same circumferential level as the shoulders 170 and 176. As a result of this positioning, the subsegment 156 extends into a ring-segment-like recess 192 which is formed between the ring-shaped shoulder 168 and the part-circular shoulder 170 in the circumferential direction 140, and is held therein in a positive-locking manner. In addition, a ring-segment-like component 64 which covers an angular region of 180° is arranged in the recess 192 or in the part of the recess 192 formed by the component 54, with the result that an entire circumference of the circular shoulder 168 is surrounded by the ring segment 152 or the component 64. FurthermOre, a projection 196 extending outwards in the radial direction 148 from an end 194 of the part-circular shoulder 170 bears against a clockwise-facing surface 198 of the connecting web 150. In a recess 200 which extends in the circumferential direction and is arranged radially between the part-circular shoulder 170 and the shoulder 176, the grating crosspieCe 106, facing in the direction of the housing 68, of the component 32 is held in a positive-locking manner, an end 202 of the grating crosspiece 106 being arranged at the same circumferential level as the shoulders 170 and 176 or the end 190 of the subsegment 154. integrally formed on an open end of the grating crosspiece 106, facing the guide unit (not shown here), of the component 32 is a peg 204 which is bent outwards with respect to the radius 42 and serves for an engagement and thus a fixing of the component 32 in a recess (not shown here) in the housing 68 or in the housing shell 160. In principle, however, it would also be conceivable for the component 32, like the component 30, to have for its stabilisation a further connecting beam, which is arranged opposite the connecting beam 110 and connects the grating crosspieces 106 at their further end regions.

Extending radially between the shoulder 176 and the shoulder 178 in the circumferential direction 140 is a further recess 206, in which a return unit 66 in the form of a spring 208 is arranged. The movably arranged component 30 is operatively connected to the components 32, 54, 56 and 64 or the unit 52 via the return unit 66, with the result that the protective device 16 or the component 30 is returned to the working position again by a spring loading in the locking and/or unlocking position (see Figure 5). A return movement of the component 30 back to the working position of the hand-held power tool 10 is limited by a limiting element which is formed by the projection 196 (see Figure 2) . In addition, a preloading of the spring 208 in the working mode of the jigsaw 12 is thereby achieved. For fixing the spring 208, a clockwise-facing round pin 210 is integrally formed on the web 174, onto which pin one end 212 of the spring 208 is fitted. The other end 214 of the spring 208 is fitted onto an anticlockwise-facing round pin 210 which is integrally formed on an upper side 216, shortened in the circumferential direction 140, of the side 116.

Furthermore, the component 30 or the subsegment 154 of the ring segment 152 and the shortened upper side 216 of the side 116 form a guide 58 in the form of a recess 218 for a guide section 60 or a mating contour 220, composed of the part-circular shoulder 170, the shoulder 176 and the uppermost grating crosspiece 106 of the component 32 of the protective device 16. In addition, the recess 192 forms a guide 58 for the ring segment 152 and the component 64, which are designed as guide sections 60. Furthermore, the components 30, 54 and 56 have, in the working position as well as in the unlocking position, curved paths 62 in the shape of the recesses 192, 218 and the mating contour 220, each having guide surfaces 222 for a guidance of the components 30, 54, 56 and 64.

Upon an assembly of the protective device 16, first the component 32 is mounted by inserting the upper grating crosspiece 106 into the recess 200 of the component 54 or the housing shell 160 and inserting the peg 204 into the recess (not shown) of the housing 68. In addition, the component 64 is inserted into the recess 192. After that, the spring 208 is introduced into the recess 206 and fitted onto the pin 210 integrally formed on the web 174. Next, the component 30 is placed into the component 56 or the housing shell 162, so that the operating lever 134 reaches through the opening 136. For final assembly, the housing shell 162 is now connected to the housing shell 160 such that the end 214 of the spring 208 engages in the pin 210 integrally formed on the upper side 216 of the side 116.

An unlocking process of the tool 24 will now be described with reference to Figures 4 and 5. Figure 4 shows the protective device 16 in a working process of the hand-held power tool 10. The components 30 and 32 cover an angular region 2200 of the circumference 50 of the reciprocating means 14 or of the holding means 20 and thus extend over an end 104 of the reciprocating means 14 or of the holding means 20, the component 32 being designed shorter than the component 30 by an extent of the side 130 of the component in the reciprocating direction 78. The spring (not shown here) corresponds in its preloading to the spring 208 shown in Figure 2, and is accordingly virtually uncompressed. The arrangement of the shoulders 168, 170, 176, 178 and of the ring segment 152 or of the component 64 with respect to one another corresponds to the arrangement described in Figure 2. As becomes clear here, the radius 44 of the side 112 and the radius 46 of the grating crosspiece 120 are coordinated with a radial distance 224 of the operating projection 128 from the axis 98 of the reciprocating means 14, the radius 44 being designed less than and the radius 46 greater than the distance 224 of the operating projection 128 from the axis 98. If now the component 30 of the protective device 16 is rotated anticlockwise by the actuation of the operating element 26, the region of interaction 28 or a lateral surface 144 of the side 112 comes into direct contact, because of the smaller radius 44, with the place of interaction 146 or the operating projection 128 for unlocking the tool holding fixture 84 and the tool 24 and displaces said fixture or tool into a recess (not shown specifically here), facing in the circumferential direction 140, in the reciprocating means 14 until the movement of the operating projection 128 is stopped by a side of the connecting beam 110 of the component 32 or until the guide section 60 is stopped at a stop 226 of the curved path 62 or of the recess 218, or the spring 208 has gone as far as it will go and is thus in its most compressed form, as illustrated in Figure 5, which shows the tool unlocking position during a tool change. By the actuation of the operating projection 128, the tool holding fixture 84 is unlocked and the tool 24 is ejected. In the unlocked state of the protective device 16, the component 30 covers at least a part 48, of approximately 95%, of the component 32, the component 30 being arranged on the outside in the radial direction and the component 32 being arranged on the inside in the radial direction 148. A locking procedure takes place analogously to the unlocking procedure.

Claims

Cla irns 1. Hand-held power tool, in particular jigsaw (12), having a reciprocating means (14) and having at least one protective device (16) for at least partly guarding the reciprocating means (14), characterised in that the protective device (16) is arranged at least partly movably.
2. Hand-held power tool having a drive unit (18) having a holding means (20) , at least one actuating unit (22) for locking and/or unlocking at least the holding means (20), in particular for a tool (24), and having at least one protective device (16) for at least partly guarding the holding means (20), characterised in that the actuating unit (22) and the protective device (16) are at least partly operatively coupled.
3. Hand-held power tool according to Claim 1 or 2, characterised in that an operating element (26) of an actuating unit (22) is arranged on the protective device (16)
4. Hand-held power tool according to one of the preceding claims, characterised by an actuating unit (22) which is formed at least partly in one piece with the protective device (16)
5. Hand-held power tool according to one of the preceding claims, characterised in that the protective device (16) has at least one region of interaction (28) with a locking and/or unlocking mechanism of an actuating unit (22)
6. Hand-held power tool according to Claim 1 or 2, characterised in that, in at least one operating state, two differing, circumferentially covering components (30, 32) are arranged on the reciprocating and/or holding means (14, 20)
7. Hand-held power tool according to Claim 6, characterised in that the two components (30, 32) are arranged movably relative to one another.
8. Hand-held power tool according to Claim 6, characterised in that one of the components (30, 32) is arranged movably and the other component (30, 32) is arranged fixedly.
9. Hand-held power tool according to one of the preceding claims, characterised in that the protective device (16) has at least two grating regions (34, 36, 38, 40) which are arranged on different radii (42, 44, 46)
10. Hand-held power tool according to Claim 6, characterised in that one of the components (30), in at least one operating state, covers at least a part (48) of the other component (32)
11. Hand-held power tool according to Claim 6, characterised in that the fixedly arranged component (32) and the movably arranged component (30), in at least one operating state, cover at least 180° of a circumference (50) of the reciprocating and/or holding means (14, 20).
12. Hand-held power tool according to Claim 6 characterised by a unit (52) which couples the fixedly arranged component (32) and the movably arranged component (30) to one another.
13. Hand-held power tool according to one of the preceding claims, characterised in that at least one component (30, 54, 56) forms at least one guide (58) for at least one guide section (60) of the protective device (16)
14. Hand-held power tool according to one of the preceding claims, characterised in that at least one component (30, 54, 56) has a curved path (62) for a guidance of another component (30, 56, 64) in at least one operating state.
15. Hand-held power tool according to Claim 6, characterised by a return unit (66), via which the movably arranged component (30) is operatively connected to a further component (32, 54, 56, 64)
16. A hand-held power tool substantially as herein described with reference to the accompanying drawings.