Abstract
A power tool including a housing mounted to be moveable with respect to, and spaced from, a base, said housing including a motor to rotate a shaft which includes, at its free end, a tool holder for a tool, said shaft extending from the housing such that the tool holder is located at or adjacent to the base and can pass through an aperture in said base, said housing connected to the base by one or more support assemblies, and a sleeve provided to be positioned on the base and form therein an area in which the said tool and aperture in the base are located when performing work on a workpiece. Dust extraction apparatus can be connected and the base can be selectively provided with guide means and also includes attachment means to allow the power tool to be selectively located with a worksurface or a guide plate.
Claims
1. Apparatus including a power tool including a housing and a base, said housing mounted to be moveable with respect to and spaced from the base, said housing including a motor to rotate a shaft which includes, at its free end, a tool holder for a cutting tool, said shaft extending from the housing such that the tool holder is located at or adjacent to the base and said housing is connected to the base by at least one extendable leg assembly, said cutting tool provided to be moveable through an aperture in the base to contact with and perform work on a workpiece located on the opposite side of the base from said housing and wherein the base is provided with retaining means to allow the base to be selectively retained with a guide plate or a worksurface and the retaining means comprise a gripping portion which is provided with an internal threaded portion to receive a shaft with a locating head and the position of which with respect to the base can be adjusted by rotation of the gripping portion.
2. Apparatus according to claim 1 wherein the said shaft is formed as two parts, a first part for threaded engagement with the said internal threaded portion and a second part with the said locating head and which is in threaded engagement with the first part.
3. Apparatus according to claim 1 wherein the shaft is provided as a single unitary component and includes said locating head and is provided in threaded engagement with the said internal threaded portion.
4. Apparatus according to claim 1 wherein the locating head can be moved to a number of positions by rotation of the gripping portion.
5. Apparatus according to claim 4 wherein the locating head is moveable between a retracted position in which the same is withdrawn into an aperture in the base to allow the base to be positioned directly onto the said workpiece and an extended position to move the locating head into a location on the guide plate or worksurface with the said guide plate or work surface positioned between the underside of the base and the locating head.
6. Apparatus according to claim 5 wherein when in an extended position the gripping portion is rotated to draw the locating head towards the base and thereby tighten the locating head against the guide plate and the guide plate against the base.
7. Apparatus according to claim 1 wherein the pitch of the threads of the internal threaded portion and a threaded portion of the shaft is selected to minimise the number of turns of the gripping portion required to move the locating head.
8. Apparatus according to claim 1 wherein the power tool includes lighting means which are provided as part of the tool and located on the base.
9. Apparatus according to claim 5 wherein when in an extended position the gripping portion is rotated to draw the locating head towards the base and thereby tighten the locating head against the worksurface.
10. Apparatus according to claim 1 wherein the said cutting tool is movable through an aperture in the base to contact with and perform work on a workpiece and a component is provided to be selectively located with the base to act as a guide to the cutting tool.
11. Apparatus according to claim 10 wherein said component is releasably located with the base or a component fitted thereto, by at least one engagement means which can be moved between an engaging position and a release position.
12. Apparatus including a power tool including a housing and a base, said housing mounted to be moveable with respect to, and spaced from, the base, said housing including a motor to rotate a shaft which includes, at its free end, a tool holder for a cutting tool, said shaft extending from the housing such that the tool holder is located at or adjacent to the base and said housing is connected to the base by at least one extendable leg assembly, said cutting tool provided to be moveable through an aperture in the base to contact with and perform work on a workpiece located on the opposite side of the base from said housing and wherein a component is provided to be selectively located with the base to reduce the size of said aperture in said base and act as a guide to the cutting tool.
13. Apparatus according to claim 12 wherein said component is releasably located with the base or a component fitted thereto, by at least one engagement means which can be moved between an engaging position and a release position.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0042] Specific embodiments of the invention are now described with reference to the accompanying drawings; wherein
[0043] FIGS. 1a-c illustrate a perspective, elevation and plan views of first and second embodiments of a router tool in accordance with one embodiment of the invention; and
[0044] FIG. 2 illustrates the sleeve and base of the router of FIGS. 1a-c in greater detail with a connector fitted thereto;
[0045] FIGS. 3a and b illustrate the router sleeve and dust and debris connector in attachment with the connector sleeve;
[0046] FIGS. 4a-d illustrate the sleeve components in accordance with one embodiment;
[0047] FIGS. 5a and b illustrate the connector of FIGS. 3a and b in attachment with an elongate member of the dust and debris extraction system;
[0048] FIGS. 6a-c illustrate an embodiment of the router with lighting means provided on the base;
[0049] FIGS. 7a-d illustrate an embodiment for the attachment of a bush guide with the base; and
[0050] FIGS. 8a-e illustrate an embodiment for the attachment of the router base to the guide plate.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0051] Referring firstly to FIGS. 1a-b there is illustrated a router power tool 2 in accordance with the invention in one configuration of use and, in FIG. 1c, the router power tool is shown in a second configuration of use. The router can be used in two main positions. The first position is that shown in the FIGS. 1a-c in which the same is located on and above a work surface on which a workpiece for which the tool is to be used is located. In an alternative position the router can be turned through 180 degrees so that the base 8 is attached to the underside of the work surface so that effectively the router is used upside down and is located below the work surface.
[0052] In one configuration the base 8 may be attached to a guide plate 4 as shown in FIG. 1c, or may be attached directly to the work surface such as that provided as part of a workcentre of the type disclosed in the applicant's patent application GB2517640 and the contents of which are incorporated herein, or may be used in a freestanding mode as illustrated in FIGS. 1a-b.
[0053] The router includes a housing 6 which is connected to the base 8 by first and second extendable support member assemblies 10,12 so as to be movable in relation thereto as indicated by arrows 14,16 by driven or manual movement along one or more racks 17 formed on at least one of the members 10,12 and pinions located in the housing 6. From the underside 18 of the housing extends a shaft 20, which at its free end includes a tool holder 22. The tool holder receives a user selected cutting tool 24 and the shaft, tool holder and cutting tool are rotated about axis 26 by connection of the shaft with a motor (not shown) located within the housing 6.
[0054] The tool passes through an aperture 28 in the base 8 in order to engage and perform the work on the workpiece which lies to the underside of the base 8 which opposes the side of the base on which the housing is located. The tool also includes first and second handles 30,32 which are located on the housing 6 on opposing sides of the same and typically at, or adjacent to, the first and second extendable support assemblies 10,12 respectively. The handles are provided so as to allow the housing to be moved downwardly towards the base and generally to allow control of the tool in use.
[0055] Turning now to FIG. 2 and FIGS. 3a-b there is illustrated the base 8 in more detail. The base 8 includes a sleeve 34 which is engaged and located on the base so that the sleeve defines an inner area 36 which is effectively enclosed when the power tool is in use. The cutting tool 24 and tool holder are located in the area 36 and the sleeve also typically at least partially encloses the aperture 28 in the base. The sleeve is formed of two halves 50, 52 which clip together at interfaces 35,37 and can also include a lid component 38 shown in FIG. 2 which tends to reduce the passage of dust and debris towards the housing 6, especially when the router is used and is attached to the underside of the work bench in the second configuration of use. In FIGS. 3a and b two different embodiments of the sleeve are shown. In FIG. 3a it will be seen that the side wall 40 of the sleeve includes a protrusion 42 which extends outwardly and which extends from the edge 44 of the sleeve to the opposing edge 46. In FIG. 3b as an alternative arrangement, a slot 49 is provided and flexible and resilient skirts 48 are provided which flex. In both embodiments the purpose is to allow the unobstructed passage of a component such as an auto spindle lock actuator provided on the tool to move in the direction of arrow 62 as the tool is used and in both embodiments the aim is to restrict the escape of dust or debris from the interior of the skirt.
[0056] As shown in FIGS. 4a-d the sleeve can be provided of the two parts 50, 52 which are joined together along axis 54. A helical guide arrangement 56 is provided which depends inwardly from the side wall and which acts to form a path to encourage the movement of dust and debris within the area 36 towards a port 58 via which the dust and debris can leave the area 36. The port can be provided in the form of a slot and there is provided a connector assembly 60 as shown in FIGS. 2a-3b which is slidable in the direction of arrow 63 with respect to the slot. The connector assembly 60 is provided in a first position when the tool is in the first configuration of use with the tool located to be operated on an upper side of a work surface and is provided in the second position when the tool is located to be used on the underside of the work surface. Typically the first and second positions of the connector assembly 60 are such as to allow the position of the connector to be optimised with respect to the collection of the dust and debris from the area 36. The base of the connector assembly 60 may be weighted so as to allow the connector to automatically move to the correct one of the first and second positions for the use of the tool.
[0057] The connector assembly is provided with a body with a channel 62 which extends to a collar assembly including a fixed portion 64 and a rotatable collar portion 66. The collar portion 66 is provided for the reception of an end of a dust and debris extraction means channel 68 in the form of a hose (not shown) or an elongate member as shown in FIG. 5a and b. The elongate member 68 includes a channel therealong which allows dust and debris from the area 36 to reach an opening end 70 which is remote from the area 36. An extraction system can be connected to the opening end 70 to allow the dust and debris to pass through the opening and be removed for disposal. The positioning of the opening end 70 remote from the base 8 means that the vacuum system which is attached thereto does not hinder the visibility of the base 8, cutting tool 24 and area 36 to the operator of the tool and therefore allows the operator to have a clearer view of the performance of the desired work using the tool. The sleeve is typically formed of a transparent material.
[0058] The visibility is further improved by the provision of a light source 71 in the base as illustrated in FIGS. 6a-c and preferably the light source is provided to have a constant focal length regardless of the particular relationship and distance between the housing 6 and the base 8. This is contrary to conventional light source means which are typically located on the housing 6 and, as the housing is moved with respect to the base, so the focus and intensity of the light at the base 8 varies. In the current invention as the light source 71 is located at the base 8, the light illumination intensity at the base 8 remains the same. In the embodiment shown, the power for the operation of the light source is linked to the power supply in the housing 6 for the operation of the motor, by cable or wires which pass along the support member 12. In FIG. 6b and it is shown that with the light source 71 illuminated and located on the base, the cutting tool 24 when in contact with the workpiece 75, creates a shadow line 77 which assists in indicating to the user the width of cut and the pint at which the cutting tool contacts the work piece.
[0059] Turning now to FIG. 7a there is illustrated the base 8 in cross section along its centreline with a base component 8a in location therewith and which is also shown in cross section. The component 8a can be selectively engaged with the base as shown in FIG. 7a and is shown separated from the base in FIGS. 7b-d for ease of illustration. A bush 84 is shown in an in-use position with the component 8a in FIGS. 7a-c and a released position in FIG. 7d. It will be seen that when in the in use position the bush 84 provides a guide aperture 86 for the cutting tool 24 to pass therethrough along the axis 87. The bush 84 sits in the base aperture 28 which is reduced in size by the base component 8a. As the bush 84 may be selectively used, and also there will typically be a range of bushes with different sizes of guide apertures 86 for selective use depending on the size of cutting tool 24 in use at that time, there is a need to be able to move bush 84 between the in use position and the removed position frequently. Also, as the bush 84 acts as a guide when in use, the location of the same is required to be accurate whilst, at the same time, requiring the minimum time and effort to engage and release the same. This is achieved in the current invention by providing first and second engagement means 88,90 which are secured to the base component 8a by screws 92 and which include locking means 94 which have a portion 96 which, when rotated to overlie the aperture 28, engage with the bush 84 as shown in
[0060] FIG. 7b and serve to retain the same in the in use position. To release the bush 84, the locking means 94 can be rotated so that the portion 96 is moved from overlying the bush 84 as shown in FIG. 7c and the bush 84 can then be released. In order to further improve the release, the bush may be provided with indents 98 as shown in FIG. 7d which are located to match with the location of the engagement means 88, 90. A further advantage is that as the component 8a is located centrally axially of the aperture 28, so, as the bush is accurately located by the engagement means in accordance with the invention, the centre axis 87 of the guide aperture 86 in the bush will be located along the axis 26 of the aperture 28 and cutting tool 24 shown in FIG. 1b so that accuracy of cut can be ensured.
[0061] Turning now to FIGS. 8a-e there is illustrated the provision of retaining means to locate the base 8 of the router with a guide plate 4 rather than the worksurface. The retaining means 102 comprise a gripping portion 104 which is provided with an internal threaded formation 106 which receives a shaft 108 on which a locating head 110 is formed or attached. The shaft 108 can be formed, as is shown with reference to FIG. 8b, as two parts, a first part 111 in threaded engagement with formation 106 and a second part 113 in which the locating head is formed and which is in threaded engagement with the first part 111. Alternatively the shaft 108 can be provided as a single unitary component with the locating head 110 and in threaded engagement with the formation 106.
[0062] Typically the locating head 110 can be moved to a number of positions by rotation of the gripping portion 104. In FIG. 8c the locating head 110 is shown in a fully retracted position in which the same is withdrawn into an aperture 114 in the base 8 so that the same does not protrude from the base and the base can therefore be positioned directly onto a workpiece. FIG. 8d shows the locating head 110 in a fully extended position and thereby allows the same to be moved into, typically, a keyhole aperture 112 in the guide plate 4 and the guide plate is then positioned in the gap between the underside 116 of the base 8 and the top face 118 of the locating head 4. When in position, the gripping portion 104 can then be rotated to draw the locating head 110 towards the base 8 and thereby tighten the top face 118 of the locating head against the guide plate 4 surface 120 and so fasten the guide plate and the base 8 together for use as illustrated in FIG. 8e.
[0063] It should be appreciated that the same attachment apparatus and method can be used when a work surface is substituted in position instead of the guide plate 4 and the router is positioned in an inverted position on the underside of the worksurface.
[0064] The provision of the threaded pitch between the internal threaded formation 106 and the shaft 108 being relatively high reduces the number of turns of the gripping portion 104 which are required to move the locating head between the positions shown in FIGS. 8c-e and so make the change of the condition more quickly achievable than with conventional mechanisms.
[0065] There is therefore provided a router power tool which has significantly improved dust and debris collection and an improved light source, all of which act, alone or in combination, to increase the visibility of the working of the tool at the base.
