GB1602263A

GB1602263A - Apparatus for removal of dust on machines for working with stone wood or the like

Info

Publication number: GB1602263A
Application number: GB13060/78A
Authority: GB
Original assignee: Baier Maschf Otto GmbH
Current assignee: Baier Maschf Otto GmbH
Priority date: 1977-04-05
Filing date: 1978-04-04
Publication date: 1981-11-11
Also published as: NL7803596A; FR2386361A1; DE7710805U1; FR2386361B3; CH627098A5; IT7821945A0; IT1093587B; DK149078A

Abstract

The device has a suction cap (8) which is displaceable in the axial direction of the tool (2) of the device, counter to the action of a spring (8a), on a holding bar (7) and the suction trough of which is arranged on one side of the tool (2) and continuously deepens towards the connection point to the suction hose (16), and also a plate-shaped conveying trough (17) which is arranged essentially concentrically to the conveying wheel (21). The suction trough is deepest in the region of the connection point with the suction hose (16) and rises constantly as far as its edge delimited by a contact point. The conveying wheel (21) has, on the side of the conveying trough, a blade rim (22) which connects its blade and delimits an outwardly enlarging channel in the conveying wheel. This device permits a simple guidance of the drilling debris. <IMAGE>

Description

54) APPARATUS FOR REMOVAL OF DUST ON MACHINES FOR WORKING WITH STONE, WOOD OR THE LIKE (71) We, MASCHINENFABRIK OHO BAIER GmbH, a Company of the Federal Republic of Germany of Schwieberdinger Strasse 104, D7140 Ludwigsburg, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The invention relates to a device for sucking off dust and the like intended for a machine for working stone, wood or the like and as described in the introductory part of Claim 1.

An object of the present invention is to provide a device of the aforementioned kind having a simple guidance of the dust and the like. According to the invention, there is provided a device for sucking off dust and the like, intended for use with a machine for working stone, wood or the like, comprising a suction cap which can be arranged at a working location of a tool of the machine and which is spring loaded to enable it to be urged against a surface of a workpiece, the cap having a through passage through which a tool of the machine can pass in use, a suction port which connects with the through passage and a suction trough disposed substantially only on'one side of the through passage and deepening gradually from its periphery remote from the through passage to its point of connection with the suction port.

The special design of the suction trough allows a favourable removal of the dust or the like from the working location of the tool.

The special design described in Claim 4 leads to a strong suction action being exerted on the dust produced by the tool, when particles which are moved substantially parallel to the contact surface are deflected in the direction of the suction hose by striking against the steep wall of the trough in the edge area thereof.

The conveyor trough can be plate-shaped in design to take the bulk of the dust to the outer area of the conveyor wheel, from where the dust is ejected into the reception container.

The conveyor wheel can be of rugged design and allow a rapid passage to the receiving container of the dust and similar material to be conveyed.

Further advantages emerge from the remaining claims, the description and the drawings. A drilling machine provided with a suction device of the invention is diagrammatically shown therein as an exemplified embodiment of the object of the invention. In the drawings: Fig. 1 shows a lateral view including a partial section; Fig. 2 shows a top view; Fig. 3 shows a front view, Fig. 4 shows a section along the line IV-IV in Fig. 1; Fig. 5 shows a detail from Fig. 3; Figs. 6 and 7 each show a section along the lines VI-VI and VII-VII respectively in Fig. machine has a hosing 5.

A drilling machine has a housing 1, to which there is secured a holding ring 3 which is coaxial with the exchangeable tool 2 and is integrally formed with a laterally arranged holding bush 4. Bearing bushes 5, 6, whose flanges butt against the holding bush 4, are inserted in the holding bush 4 at the ends thereof. A holding rod 7, which is square in cross section and is surrounded by ahelical spring 8a, is mounted in the bearing bushes 5, 6 so as to be axially displaceable.

At its free end, the holding rod 7 carries a suction cap 8 which is penetrated by the tool 2.

The suction cap 8 is designed as shown in Figs. 5 to 7, that is to say the face of the suction cap 8 remote from the holding ring 3 is flat and forms a contact surface 9 which, in use, is held in abutment, by means of a spring 8a, with the article being worked upon by the tool. A suction trough 10 in the form of a recess surrounded by the contact surface 9 is provided in the suction cap 8.

The suction trough 10 is arranged with respect to a through hole 11 for the tool and a suction port opening 12, at one side of the said hole 11 and opening 12 and is approxi mately of oval design. The suction trough 10 is generally of domed shape in that it increases continuously in depth from the periphery of the contact surface 9 towards the suction port opening 12. In the region of the suction port opening 12 and the through hole 11, the depth of the trough increases steeply from the contact surface to form a sharp edge. The suction trough 10 is, therefore, effectively arranged on on one side of the through hole 11 and the connection point 12, while the contact surface 9 completely surrounds the suction trough 10, the through hole 11 and suction port opening 12. The maximum distance between the centre of the suction cap 8, which centre is determined by the tool 2, and the rim of the suction trough 10 determines the radius of a circle, whose area equals approximately double the area of the suction trough 10.

As the tool 2 penetrates the article to be worked the spring 8a is compressed and the holding rod is effectively pushed rearwardly.

The spring 8a thus serves, as stated above to hold the suction cap in abutment with the surface of the artide being worked upon.

The suction cap 8 is connected to the circular cylindrical end portion of the holding rod 7 in a rotation-proof manner by means of a traverse pin 14. At the end of the holding rod 7 that is remote from the suction cap 8, a stop screw 15 is screwed in, which limits the length of the holding rod 7 projecting from the holding bush 4. Along the holding rod 7, there are furthermore provided two or more threads which are vertical to the longitudinal axis thereof and are intended for screwing in the stop screw 15 so as to adapt the length of the holding rod 5 projecting from the holding bush 4 to the selected length of the exchangeable tool 2.

The suction port 13 is connected to a suction hose 16 which is taken vertically to the housing 1. In the portion of the housing 1 which is connected to the suction hose 16, there is provided a flat conveyor trough 17 (Fig. 1) which is coaxial to the driving shaft 18 of a driving motor (not shown) and on the edge of which there is arranged a suction port 19 which serves as a connection to the suction hose 16 and whose orifice 1 9b is smaller than the depth of the conveyor trough 17. The suction port 19 is located in a special suction piece 1 9a which engages with lateral flanges in the housing 1, as shown in Fig. 4. The suction piece 19a is inserted in the housing in the axial direction and is held in its position by screwable parts of the housing 1.

The driving motor referred to above serves, in use, to drive the tool and a conveyor wheel yet to be described.

On one side of the conveyor trough 17, a fan wheel 20 is arranged on the driving shaft 18 so as to be coaxial to the conveyor trough 17, while on the other open side thereof there is seated a conveyor wheel 21 which has radially arranged vanes which are surrounded by a wheel rim 22 at the conveyor trough 17 end, as shown in Fig. 4. As shown in Fig. 1, the wheel rim 22 is of triangular design in cross-section and bounds channels which are each arranged between two blades and are bounded on the inside by the hub of the conveyor wheel 21 and taper in the direction of the conveyor trough.

An ejection channel 23 is arranged so as to be tangential to the conveyor wheel 21, as shown in Fig. 4. A channel body 24 which surrounds the ejection channel 23 has, in the area of the conveyor wheel 21, a flange which surrounds it and with the aid of which it is accommodated in a corresponding recess in the housing 1 and can be removed or inserted when a coaxial housing part is taken off. The channel body 24 consists of plastics material. It carries at its free end a receiving bag 25 which is removably arranged thereon. The driving motor rotates in the direction of the arrow A shown in Fig.

4.

The dust produced during the drilling of a hole in a wall by the tool 2 is received by the suction trough 10 and is sucked, by virtue of the creation of a partial vacuum caused by rotation of the conveyor wheel 21, to the connection point 12 to be removed through the suction port 13 and the suction hose 16.

Surrounding the driving shaft 18, the dust passes into the conveyor trough 17, which is designed in such a way that the dust is sucked to the conveyor wheel 21. As can be seen the conveyor trough increases in width conically towards the conveyor wheel. The dust being carried by the conveyor wheel 21 is hurled by the latter into the ejection channel 23 and passes from there into the collecting bag 25. The dust is conducted from the suction point in the area of the suction trough 10 to the collecting bag 25 with a minimum expenditure of energy, the important factor being a reliable removal of the dust from the working location.

WHAT WE CLAIM IS: 1. A device for sucking off dust and the like, intended for use with a machine for working stone, wood or the like, comprising a suction cap which can be arranged at a working location of a tool of the machine and which is spring loaded to enable it to be urged against a surface of a workpiece, the cap having a through passage through which a tool of the machine can pass in use, a suction port which connects with the through passage, and a suction trough disposed substantially only on one side of the through passage and deepening gradually from its periphery remote from the through passage to its point of connection with the suction port.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. mately of oval design. The suction trough 10 is generally of domed shape in that it increases continuously in depth from the periphery of the contact surface 9 towards the suction port opening 12. In the region of the suction port opening 12 and the through hole 11, the depth of the trough increases steeply from the contact surface to form a sharp edge. The suction trough 10 is, therefore, effectively arranged on on one side of the through hole 11 and the connection point 12, while the contact surface 9 completely surrounds the suction trough 10, the through hole 11 and suction port opening 12. The maximum distance between the centre of the suction cap 8, which centre is determined by the tool 2, and the rim of the suction trough 10 determines the radius of a circle, whose area equals approximately double the area of the suction trough 10. As the tool 2 penetrates the article to be worked the spring 8a is compressed and the holding rod is effectively pushed rearwardly. The spring 8a thus serves, as stated above to hold the suction cap in abutment with the surface of the artide being worked upon. The suction cap 8 is connected to the circular cylindrical end portion of the holding rod 7 in a rotation-proof manner by means of a traverse pin 14. At the end of the holding rod 7 that is remote from the suction cap 8, a stop screw 15 is screwed in, which limits the length of the holding rod 7 projecting from the holding bush 4. Along the holding rod 7, there are furthermore provided two or more threads which are vertical to the longitudinal axis thereof and are intended for screwing in the stop screw 15 so as to adapt the length of the holding rod 5 projecting from the holding bush 4 to the selected length of the exchangeable tool 2. The suction port 13 is connected to a suction hose 16 which is taken vertically to the housing 1. In the portion of the housing 1 which is connected to the suction hose 16, there is provided a flat conveyor trough 17 (Fig. 1) which is coaxial to the driving shaft 18 of a driving motor (not shown) and on the edge of which there is arranged a suction port 19 which serves as a connection to the suction hose 16 and whose orifice 1 9b is smaller than the depth of the conveyor trough 17. The suction port 19 is located in a special suction piece 1 9a which engages with lateral flanges in the housing 1, as shown in Fig. 4. The suction piece 19a is inserted in the housing in the axial direction and is held in its position by screwable parts of the housing 1. The driving motor referred to above serves, in use, to drive the tool and a conveyor wheel yet to be described. On one side of the conveyor trough 17, a fan wheel 20 is arranged on the driving shaft 18 so as to be coaxial to the conveyor trough 17, while on the other open side thereof there is seated a conveyor wheel 21 which has radially arranged vanes which are surrounded by a wheel rim 22 at the conveyor trough 17 end, as shown in Fig. 4. As shown in Fig. 1, the wheel rim 22 is of triangular design in cross-section and bounds channels which are each arranged between two blades and are bounded on the inside by the hub of the conveyor wheel 21 and taper in the direction of the conveyor trough. An ejection channel 23 is arranged so as to be tangential to the conveyor wheel 21, as shown in Fig. 4. A channel body 24 which surrounds the ejection channel 23 has, in the area of the conveyor wheel 21, a flange which surrounds it and with the aid of which it is accommodated in a corresponding recess in the housing 1 and can be removed or inserted when a coaxial housing part is taken off. The channel body 24 consists of plastics material. It carries at its free end a receiving bag 25 which is removably arranged thereon. The driving motor rotates in the direction of the arrow A shown in Fig. 4. The dust produced during the drilling of a hole in a wall by the tool 2 is received by the suction trough 10 and is sucked, by virtue of the creation of a partial vacuum caused by rotation of the conveyor wheel 21, to the connection point 12 to be removed through the suction port 13 and the suction hose 16. Surrounding the driving shaft 18, the dust passes into the conveyor trough 17, which is designed in such a way that the dust is sucked to the conveyor wheel 21. As can be seen the conveyor trough increases in width conically towards the conveyor wheel. The dust being carried by the conveyor wheel 21 is hurled by the latter into the ejection channel 23 and passes from there into the collecting bag 25. The dust is conducted from the suction point in the area of the suction trough 10 to the collecting bag 25 with a minimum expenditure of energy, the important factor being a reliable removal of the dust from the working location. WHAT WE CLAIM IS:

1. A device for sucking off dust and the like, intended for use with a machine for working stone, wood or the like, comprising a suction cap which can be arranged at a working location of a tool of the machine and which is spring loaded to enable it to be urged against a surface of a workpiece, the cap having a through passage through which a tool of the machine can pass in use, a suction port which connects with the through passage, and a suction trough disposed substantially only on one side of the through passage and deepening gradually from its periphery remote from the through passage to its point of connection with the suction port.

2. A device as claimed in Claim 1 and

provided with a conveyor wheel which is connected to the suction port by a hose and is drivable frorn a drive motor of the machine and upstream of which there is arranged in the direction of conveyance a conveying chamber which is substantially concentric with the conveyor wheel and whose maximum diameter is substantially equal to the diameter of the conveyor wheel, the conveyor chamber being in the form of a conveyor through.

3. A device as claimed in claim 1, or 2, wherein the maximum distance between the centre of the suction cap, which centre is determined by the tool and the edge of the suction trough determines the radius of a circle whose area equals approximately double the area of the suction trough, and in that the area determined by this circle is flat with the exception of the suction trough.

4. A device as claimed in Claim 2 or 3, wherein the suction trough rises continuously from its point of connection with the suction port up to a position on the contact surface which is farthest from the connection point and drops steeply in the area of the connection point, a sharp edge being provided between the contact surface and the dropping surface.

5. A device as claimed in any preceding claim, wherein the suction cap is fitted to the free end of a holding rod which is displaceable against the action of the spring and has a cross section preventing the holding rod from being rotated in its guide.

6. A device as claimed in Claim 5, characterised in that the holding rod is guided in two bearing bushes arranged at a distance from each other.

7. A device as claimed in Claim 5 or 6, characterised in that the displaceable length of the holding rod can be adjusted, at least in steps by means of a shiftable stop piece.

8. A device as claimed in Claim 2, 3 or 4, characterised in that the conveyor trough is flat in design and has a connection which is vertically directed to its centre and is connected to the suction trough.

9. A device as claimed in Claim 8 characterised in that at the end of the conveyor trough, the conveyor wheel has a blade rim which connects its blades and bounds a channel, which widens towards the outside, in the conveyor wheel.

10. A device as claimed in Claim 9, characterised in that an ejection channel, which is taken tangentially to the conveyor wheel, is accommodated in a channel body which is inserted in the housing and serves for the detachable fitting of the receiving container.

11. A device as claimed in Claim 9 or 10, characterised in that a suction piece, which is connected with its suction port to the conveyor trough, is held in the divided housing by means of lateral flanges.

12. A device for sucking off dust and the like intended for a machine for working stone, wood and the like, substantially as hereinbefore described with reference to and as illustrated in the accompanying draw ings.