US 20010052429 A1
A hand-held tool including a housing, a rod-shaped stop secured on the housing and a dust collector (3) having a dust screen (4) for at least partially circumferentially surrounding a working tool (2) insertable into tool, a deflection-resistant, axially resiliently displaceable at a radial distance from a tool axis (A), suction conduit (6), and guide and connection elements (7) for securing the dust collector (3) on the depth stop (9).
1. A hand-held tool, comprising a housing; a rod-shaped depth stop (9) secured on the housing; and a dust collector (3) having a dust screen (4) for at least partially circumferentially surrounding a working tool (2) insertable into the hand-held tool, a deflection-resistant, axially resiliently displaceable at a radial distance from a tool axis (A), suction conduit (6), and guide and connection means (7) for securing the dust collector (3) on the depth stop (9).
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 1. Field of the Invention
 The present invention relates to a hand-held tool axially displaceable for abrasive removal of material and, in particular, to an electrically driven drilling and/or chiseling tool for working stone or stone-like material and including a dust collector with suction properties for removing the abrasively removable material.
 2. Description of the Prior Art
 German Publication DE 43 21 906 discloses a drilling tool with a dust collector located beneath the tool and connected therewith by a resilient bellows. The dust collector sealingly abuts a wall of a constructional component, in which a hole is being made, and collects the removable abrasive material.
 German Publication DE 94 11 587 discloses the use of a resilient bellows that sealingly surrounds a working tool, is arranged between a wall of a constructional component and the drilling tool housing, and is connected with vacuum-generating suction means. U.S. Pat. No. 5,688,082 discloses a drilling tool in which the bellows, which surrounds the working took, is secured, in the vicinity of a drilling tool chuck for receiving the working tool, to a cylindrical flange provided on the drilling tool. For securing the bellows to the flange, a damping block is provided. A rod, which is connected to the wall-side bellows ring, slides in a bore provided in the clamp block, with a dog provided on the rod serving as a depth stop.
 A common drawback of the dust collectors, bellows, which sealingly surround the working tool consists in a very poor visibility of the working tool which is surrounded by a such, mostly transparent dust collector which also prevents an immediate access to the working tool or the chuck.
 German Publication DE 195 43 599 discloses a separate, wall-abutting dust collector with free, i.e., not arranged in a sealed space, suction openings which at least partially circumscribes the working tool. The drawback of such dust collectors consists in that they need be held on a wall with a free hand of the drilling tool user.
 EP-O-456 598 discloses a dust collector that includes a deflection-resistant, axially resiliently movable, nib-shaped, suction conduit displaceable along the working tool axis and secured to a clamp block with an additional manual handle. The drawback of this dust collector consists in its limited use, as it can be used for a limited range of bore lengths because it has limited deflection resistance and path of movement.
 U.S. Pat. No. 4,064,952 disclose a dust collector that circumferentially surrounds the working tool, is located radially outwardly, and is displaceably connected to the drilling tool housing. Through the opening, which surrounds the working tool in the wall vicinity, a compressed air is supplied from the drilling tool and delivers the removed material into the dust collector. The opposite end of the duct collector is connected with a vacuum-producing suction means. This dust collector has a rather complicated structure and, because it requires the use of special attachment means, cannot be used with different types of drilling tools.
 U.S. Pat. No. 3,779,663 discloses a bar-shaped depth stop which is connected with a drilling tool and extends sidewise therefrom parallel thereto.
 German Publication DE 296 056 221 discloses attachment of bar- or rod-shaped elements to drilling tools with locking clamp blocks. The bar or rod-shaped elements are secured on mostly standartized cylindrical flanges in vicinity of working tool chucks.
 German Publication 196 06 498 discloses attachment to such cylindrical flanges, which can be rotated about the working tool axis and secured in different angular positions, of a depth stop together with an additional handle.
 An object of the present invention is to provide a dust collector in which the drawbacks of the prior art dust collectors would be eliminated.
 Another object of the present invention is to provide a dust collector which would not obscure the view of the working tool and would not interfere with the working tool handling.
 A further object of the present invention is to provide a dust collector that can be used with a variety of drilling or the like tools.
 This and other objects of the present invention, which will become apparent hereinafter are achieved by providing a hand-held tool, e.g., drilling and/or chiseling tool including a housing, a bar or rod-shaped depth stop secured on the housing, and a dust collector having a dust screen for at least partially circumferentially surrounding a working tool insertable into the hand-held tool.
 The dust collector further includes a deflection-resistant, axially resiliently displaceable at a radial distance from a tool axis, suction conduit, and guide and connection elements for securing the dust collector on the depth stop.
 According to the present invention, an open dust collector, which at least partially surrounds the working tool, includes a deflection-resistant, axially resiliently movable, nib-shaped suction conduit. The suction conduit is radially spaced from the working tool and is displaceable parallel to the working tool axis. The dust collector is secured on a substantially standartized, rod or bar-shaped depth stop. The depth stop, in turn, is secured on a clamp block provided with a handle, e.g., with a tightening strap. The clamp is secured, in the vicinity of a chuck for receiving the working tool, advantageously, on a cylindrical flange provided on hand-held tool housing. To this end, the dust collector includes guide and connecting means provided on a side of the suction conduit. The guide and connection means provides for securing of the dust collector on the depth stop with a possibility of displacement, advantageously, parallel to the working tool axis. The guide and connection means includes, advantageously, cylindrical or prismatic recesses which partially or completely surround the depth stop and insure a formlocking displacement of the dust collector along the depth stop. With the use of appropriate locking means, e.g., a hand screw, the dust collector can be secured on the depth stop in desired longitudinal and/or angular, continuous or discrete positions.
 The possibility to adjust the overhang of the depth stop with respect to the clamp block and the possibility to arbitrary select the position of the dust collector in front of or behind the clamp block provide for a wide range of possible positions of the dust collector along the working tool axis. A longitudinal flexibiliaty of the suction conduit of the dust collector, i.e., varying of its length is insured by forming the suction conduit, advantageously, of engaging in each other, spring-biased with respect to each other, telescopic tubes. The foregoing structure of the suction conduit insures shortening of the suction conduit with the immersion of the working tool into the removal material, i.e., into a wall of a construction component in which, e.g., a bore is drilled.
 Advantageously, the center of the open openings for suction of the removable material lies, with an appropriate attachment of the suction conduit and the dust collector, substantially on the working tool axis. The center advantageously lies within the plane of the axis of the guide and connection means and is radially spaced from the axis of the guide and connection means by a distance that corresponds to the distance the center of the attachment opening in the clamp block for the depth stop is spaced from the working tool axis. This insures maintaining of a predetermined position of the dust collector relative to the working tool axis. Naturally, by selecting the size of the suction opening, the difference in the radial positions of the dust collector with respect to the working tool axis for different hand-held tools and their clamp blocks can be compensated.
 Due to the standardization of the cylindrical flanges, the clamp block can be secured in a mirrow position, whereby a left-hand positioning of the dust collector is possible.
 The novel features of the present invention, which are considered as characteristic for the invention, are set forth in the appended claims. The invention itself, however, both as to its construction and its mode of operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiments, when read with reference to the accompanying drawings.
 The drawings show:
FIG. 1 a side view of a hand-held tool with dust collector according to the present invention with the tool operating with a elongate working tool; and
FIG. 2 a side view of a hand-held tool with a dust collector according to the present invention with the tool operating with a short working tool.
 A hand-held tool 1, which is shown in FIG. 1, includes a dust collector 3, which is secured to the tool housing and extends parallel to the tool axis A along which a working tool 2 extends. The dust collector 3 includes a dust screen 4 which abuts, advantageously, sealingly, a surface 5. The dust screen 4 at least partially circumferentially surrounds the working tool 2. The dust collector 3 includes a deflection-resistant, axially resiliently movable, suction conduit 6.
 The suction conduit 6 is radially spaced from the axis A of the tool and is advantageously formed of axially spring-supported telescopic tubes. The dust collector 3, together with the suction conduit 6, is fixedly secured on a standard, rod-shaped, depth stop 9 having a diameter from 5 to 8 mm. The dust collector 3 is secured on the depth stop 9 with guide and connecting means 7 displaceable along the depth stop 9 and having clamping means 8 shaped as a hand screw. The depth stop 9, which is secured on the tool housing and is displaceable parallel to the tool axis A, is secured on a substantially cylindrical flange 13 provided on the housing adjacent to a working tool chuck 12. For securing the depth stop 9 on the flange 13, there is provided a damp block 10 with a handle 11. With a short working tool 2, the dust collector 3 is secured on the depth stop 9 on a side of the clamp block 10 remote from the working tool 2, as shown in FIG. 1.
 In FIG. 2, the dust collector 3 is shown as being secured on the depth stop 9 on a side of the clamp block 10 adjacent to the working tool 2. The depth stop 9 is securable on the side of the clamp block 10 adjacent to the working tool 2 when an elongate working tool 2 is used.
 Though the present invention was shown and described with references to the preferred embodiments, such are merely illustrative of the present invention and are not to be construed as a limitation thereof, and various modifications of the present invention will be apparent to those skilled in the art. It is, therefore, not intended that the present invention be limited to the disclosed embodiments or details thereof, and the present invention includes all variations and/or alternative embodiments within the spirit and scope of the present invention as defined by the appended claims.