EP3092190A1 - Separator device associated with a group for feeding granular material - Google Patents

Separator device associated with a group for feeding granular material

Info

Publication number
EP3092190A1
EP3092190A1 EP15703103.0A EP15703103A EP3092190A1 EP 3092190 A1 EP3092190 A1 EP 3092190A1 EP 15703103 A EP15703103 A EP 15703103A EP 3092190 A1 EP3092190 A1 EP 3092190A1
Authority
EP
European Patent Office
Prior art keywords
driven
lower inlet
inlet mouth
stirrer member
actuator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15703103.0A
Other languages
German (de)
French (fr)
Inventor
Mauro BALDAZZI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP3092190A1 publication Critical patent/EP3092190A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/42—Nozzles

Definitions

  • the invention is inserted in the technical field relative to machines adapted to draw dry granular or powder material, arranged in a container, in piles or bags, in order to transfer and dispense such material in a pre- established feeding zone, even over a great distance.
  • At least one immersed tube is provided, intended to be at least partially immersed in the aforesaid material with nearly vertical position.
  • An air compressor is provided in the machine, or an outlet is provided for connecting to an external compressed air line.
  • the latter is conveyed to the lower inlet mouth of the immersed tube and then directed, e.g. by means of a nozzle or air blade, to the interior of the tube itself, directed towards the desired action direction.
  • the reduced pressure causes an increase of cohesion in the material that is situated in front of the lower inlet mouth, which tends to form lumps; this more easily occurs when the material grain size is average or fine, or irregular.
  • Other possible causes of the lump formation are given by the presence, in the granular product mass, of more humid zones, or by a certain degree of adhesivity of the granular surface of the product to be conveyed.
  • Such lumps even when they are not particularly compact, still tend to obstruct the abovementioned lower inlet mouth and to form a "cap” that can prevent the regular flow of the material towards the interior of the immersed tube.
  • Object of the present invention is therefore to propose a separator device to be associated with a known group for feeding granular or powder material, shaped in a manner so as to prevent the formation of lumps in the suction zone and to ensure continuous feeding.
  • Another object of the invention consists of obtaining a device of simple conception and minimal bulk, such to avoid obstructing the operation of the tube suction means associated therewith.
  • Still another object of the invention regards the desire to obtain a device suitable for most granular or powder materials that are normally treated with said tube suction means, that is however shaped such that it can be easily modified in order to make it extremely effective with specific materials.
  • a further object of the invention resolves to limit the production costs of the device within limits proportionate to that of the feeding group associated therewith.
  • a separator device associated with a group for feeding granular or powder material, with said group of the type comprising tube suction means, at least partially immersed in said granular or powder material, and adapted to draw such material through a lower inlet mouth, at which reduced pressure is generated aimed to suck the same material, to introduce it inside said tube suction means and to project it at speed towards a feeding zone situated downstream.
  • the aforesaid device comprises at least one stirrer member, arranged in front of the inlet mouth, driven by a relative actuator according to a pre-established movement cycle, adapted to apply, to such granular or powder material, a mechanical stress aimed to prevent the spontaneous aggregation of the grains of the same material located therein, or to break up possible previously formed lumps.
  • Fig. 1 illustrates, in axonometric view, an overall view of a known machine for feeding granular or powder material
  • Fig. 2 illustrates a side view of the machine of Fig. 1 , with feeding groups underlined, within a sample container of granular or powder material provided in the machine itself;
  • FIG. 3 illustrates a front view of Fig. 2
  • Fig. 4 illustrates, with parts removed, a tube suction means provided in each of said groups;
  • Fig. 5 illustrates, in section view and in enlarged scale, the detail K of Fig. 4;
  • Fig. 6 illustrates a bottom view of Fig. 5, with parts removed;
  • Fig. 7 also illustrates a bottom view of Fig. 5, in slight axonometric view
  • Fig. 8 illustrates a view of the same detail K of Fig. 4, with different orientation
  • Fig. 9 illustrates a section view along the plane IX-IX of Fig. 8.
  • reference number 1 indicates a machine, of substantially known type, adapted to draw dry granular or powder material M, in order to transfer it and dispense it in a pre-established feeding zone A.
  • a container 2 e.g. shaped like a trash bin, in which the material M is inserted; inside the container 2, at least one group 3 is present for feeding the material M, comprising tube suction means 4, intended to be at least partially immersed in the same material M, and dispensing members 5, connected to the top of the tube suction means 4, extended to outside the container 2 and provided for reaching said feeding zone A at which the drawn material M is expelled (Figs. 1 , 2, 3).
  • two tube suction means 4 are provided; those lacking the relative dispensing members 5 are non-operative, but with the application of such members they allow obtaining a further group 3 for feeding the material M into another feeding zone, simultaneously with said zone A.
  • Each of said tube suction means 4 comprises, at the lower inlet mouth 4B, in a per se known manner, a system for sending compressed air to an annular nozzle 14 arranged to circumscribe the abovementioned lower inlet mouth 4B; the compressed air is directed, through the latter, towards the interior of the tube suction means 4 and directed upward.
  • the initial section 4A of the suction means 4, next to the same lower inlet mouth 4B, is shaped like a Venturi tube, such that the air is accelerated; this causes, upstream of the annular nozzle 14, reduced pressure that comes to be localized in the immediate vicinity of the lower inlet mouth 4B. Consequently, the dry material M is sucked into the tube and projected towards the abovementioned feeding zone A (Figs. 8, 9).
  • the separator device is localized immediately outside the abovementioned lower inlet mouth 4B and is adapted to prevent lumps of material M - possibly formed due to the increase of cohesion given by the reduced pressure localized therein - which can constitute a "cap” that prevents the regular flow of the material M towards the interior of the tube suction means 4.
  • the separator device 10 comprises at least one stirrer member 1 1 arranged in front of said lower inlet mouth 4B, driven by a relative actuator 12 according to a pre-established movement cycle, adapted to apply, to said granular or powder material M, dynamic actions aimed to prevent the spontaneous aggregation of the grains of the same material M or to break up possible previously formed lumps.
  • said stirrer member 1 1 is constituted by a shaped bar, arranged substantially parallel to said lower inlet mouth 4B and driven by a linear actuator 12, e.g. a pneumatic or hydraulic cylinder, adapted to impart a reciprocating rectilinear movement according to a direction Y parallel to the axis of said tube suction means 4, with pre- established frequency.
  • a linear actuator 12 e.g. a pneumatic or hydraulic cylinder
  • the shaped bar 1 1 translates perpendicular to the respective lying plane.
  • the pneumatic cylinder 12 is supported alongside the lower inlet mouth 4B by a flange 13, with axis parallel to that of the tube suction means 4, while the shaped bar 1 1 is transversely fixed, with one end thereof, to the stem 12A of the pneumatic cylinder 12, which is directed downward.
  • the shaped bar 1 1 is advantageously provided, at the other end, with an appendage 1 1 A bent nearly as a square, in a manner such that it is parallel to the abovementioned movement direction Y, said appendage 1 1 A being provided for slidably engaging a guide hole 13A obtained in said flange 13.
  • the flange 13 has shape suitable for defining the abovementioned Venturi tube initial section 4A of the suction means 4.
  • said stirrer member 1 1 is constituted by an articulated blade, arranged substantially parallel to said lower inlet mouth 4B and driven with reciprocating oscillating movement, according to a direction nearly parallel to the same mouth 4B, with pre-established frequency.
  • said stirrer member 1 1 is constituted by an articulated blade, arranged substantially parallel to said lower inlet mouth 4B and driven with reciprocating oscillating movement, according to a direction nearly perpendicular to the same mouth 4B, with pre-established frequency.
  • said stirrer member 1 1 is still constituted by an articulated blade, arranged substantially parallel to said lower inlet mouth 4B and driven with continuous or reciprocating circular movement.
  • the actuator 12 can indifferently be of pneumatic type, like the cylinder associated with the shaped bar 1 1 , or of electromechanical type, or of electromagnetic type.
  • the proposed separator device is of simple conception, being in practice constituted by only two elements, and minimal bulk, such to avoid obstructing the operation of the tube suction means associated thereto, as well as other functional characteristics of the machine.
  • the device in each of the above-indicated embodiments, is suitable for most granular or powder materials that are normally treated with said tube suction means; nevertheless, its conformation allows optimizing the shape of the separator member and its movement in order to make it extremely effective with specific materials and/or with particular grain sizes thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)

Abstract

The separator device (10) is associated with a known group for feeding granular or powder material (3) wherein tube suction means (4) are adapted to draw granular or powder material (M) through a lower inlet mouth (4B) and to project it at speed towards a feeding zone (A) situated downstream. The separator device (10) comprises at least one stirrer member (11), arranged in front of said lower inlet mouth (4B) and driven by a relative actuator (12) according to a pre-established movement cycle, with said stirrer member (11) adapted to apply, to the abovementioned granular or powder material (M), dynamic actions aimed to prevent the spontaneous aggregation of the grains of the same material (M) located therein, or to break up possible previously formed lumps.

Description

Title: SEPARATOR DEVICE ASSOCIATED WITH A GROUP FOR FEEDING GRANULAR MATERIAL
DESCRIPTION
The invention is inserted in the technical field relative to machines adapted to draw dry granular or powder material, arranged in a container, in piles or bags, in order to transfer and dispense such material in a pre- established feeding zone, even over a great distance.
In a known type of such machines, at least one immersed tube is provided, intended to be at least partially immersed in the aforesaid material with nearly vertical position.
An air compressor is provided in the machine, or an outlet is provided for connecting to an external compressed air line. The latter is conveyed to the lower inlet mouth of the immersed tube and then directed, e.g. by means of a nozzle or air blade, to the interior of the tube itself, directed towards the desired action direction.
The rapid outflow of air thus oriented causes reduced pressure upstream of the nozzle, by Venturi effect; such reduced pressure comes to be localized in the immediate vicinity of the lower inlet mouth. Consequently, the dry granular or powder material is sucked in the tube and projected towards the abovementioned feeding zone.
The reduced pressure causes an increase of cohesion in the material that is situated in front of the lower inlet mouth, which tends to form lumps; this more easily occurs when the material grain size is average or fine, or irregular. Other possible causes of the lump formation are given by the presence, in the granular product mass, of more humid zones, or by a certain degree of adhesivity of the granular surface of the product to be conveyed.
Such lumps, even when they are not particularly compact, still tend to obstruct the abovementioned lower inlet mouth and to form a "cap" that can prevent the regular flow of the material towards the interior of the immersed tube.
In some known productions, it was attempted to remedy the drawback by vibrating the entire immersed tube assembly, so as to impart shaking thereto which prevents the formation of lumps, or which is able to break them up if they have formed.
The above-described technical solution has however variable effectiveness, such that the formation of said lumps is not totally prevented, with the drawbacks of machine blocking that ensue.
Object of the present invention is therefore to propose a separator device to be associated with a known group for feeding granular or powder material, shaped in a manner so as to prevent the formation of lumps in the suction zone and to ensure continuous feeding.
Another object of the invention consists of obtaining a device of simple conception and minimal bulk, such to avoid obstructing the operation of the tube suction means associated therewith.
Still another object of the invention regards the desire to obtain a device suitable for most granular or powder materials that are normally treated with said tube suction means, that is however shaped such that it can be easily modified in order to make it extremely effective with specific materials.
A further object of the invention resolves to limit the production costs of the device within limits proportionate to that of the feeding group associated therewith.
These and other objects are fully attained by means of a separator device associated with a group for feeding granular or powder material, with said group of the type comprising tube suction means, at least partially immersed in said granular or powder material, and adapted to draw such material through a lower inlet mouth, at which reduced pressure is generated aimed to suck the same material, to introduce it inside said tube suction means and to project it at speed towards a feeding zone situated downstream. The aforesaid device comprises at least one stirrer member, arranged in front of the inlet mouth, driven by a relative actuator according to a pre-established movement cycle, adapted to apply, to such granular or powder material, a mechanical stress aimed to prevent the spontaneous aggregation of the grains of the same material located therein, or to break up possible previously formed lumps.
The characteristics of the invention will be clear from the following description of several preferred embodiments of the present separator device associated with a group for feeding granular or powder material, in accordance with that reported in the claims and with the aid of the enclosed drawing tables in which:
- Fig. 1 illustrates, in axonometric view, an overall view of a known machine for feeding granular or powder material;
Fig. 2 illustrates a side view of the machine of Fig. 1 , with feeding groups underlined, within a sample container of granular or powder material provided in the machine itself;
- Fig. 3 illustrates a front view of Fig. 2; Fig. 4 illustrates, with parts removed, a tube suction means provided in each of said groups;
Fig. 5 illustrates, in section view and in enlarged scale, the detail K of Fig. 4;
- Fig. 6 illustrates a bottom view of Fig. 5, with parts removed;
Fig. 7 also illustrates a bottom view of Fig. 5, in slight axonometric view; Fig. 8 illustrates a view of the same detail K of Fig. 4, with different orientation;
Fig. 9 illustrates a section view along the plane IX-IX of Fig. 8.
In the abovementioned figures, reference number 1 indicates a machine, of substantially known type, adapted to draw dry granular or powder material M, in order to transfer it and dispense it in a pre-established feeding zone A.
Provided in the machine 1 is a container 2, e.g. shaped like a trash bin, in which the material M is inserted; inside the container 2, at least one group 3 is present for feeding the material M, comprising tube suction means 4, intended to be at least partially immersed in the same material M, and dispensing members 5, connected to the top of the tube suction means 4, extended to outside the container 2 and provided for reaching said feeding zone A at which the drawn material M is expelled (Figs. 1 , 2, 3).
In the example pursuant to the figures, two tube suction means 4 are provided; those lacking the relative dispensing members 5 are non-operative, but with the application of such members they allow obtaining a further group 3 for feeding the material M into another feeding zone, simultaneously with said zone A.
Each of said tube suction means 4 comprises, at the lower inlet mouth 4B, in a per se known manner, a system for sending compressed air to an annular nozzle 14 arranged to circumscribe the abovementioned lower inlet mouth 4B; the compressed air is directed, through the latter, towards the interior of the tube suction means 4 and directed upward.
The initial section 4A of the suction means 4, next to the same lower inlet mouth 4B, is shaped like a Venturi tube, such that the air is accelerated; this causes, upstream of the annular nozzle 14, reduced pressure that comes to be localized in the immediate vicinity of the lower inlet mouth 4B. Consequently, the dry material M is sucked into the tube and projected towards the abovementioned feeding zone A (Figs. 8, 9).
The separator device, subject of the present invention, indicated overall with reference number 10, is localized immediately outside the abovementioned lower inlet mouth 4B and is adapted to prevent lumps of material M - possibly formed due to the increase of cohesion given by the reduced pressure localized therein - which can constitute a "cap" that prevents the regular flow of the material M towards the interior of the tube suction means 4.
The separator device 10 comprises at least one stirrer member 1 1 arranged in front of said lower inlet mouth 4B, driven by a relative actuator 12 according to a pre-established movement cycle, adapted to apply, to said granular or powder material M, dynamic actions aimed to prevent the spontaneous aggregation of the grains of the same material M or to break up possible previously formed lumps.
In a preferred embodiment, pursuant to the figures, said stirrer member 1 1 is constituted by a shaped bar, arranged substantially parallel to said lower inlet mouth 4B and driven by a linear actuator 12, e.g. a pneumatic or hydraulic cylinder, adapted to impart a reciprocating rectilinear movement according to a direction Y parallel to the axis of said tube suction means 4, with pre- established frequency.
In practice, the shaped bar 1 1 translates perpendicular to the respective lying plane.
The pneumatic cylinder 12 is supported alongside the lower inlet mouth 4B by a flange 13, with axis parallel to that of the tube suction means 4, while the shaped bar 1 1 is transversely fixed, with one end thereof, to the stem 12A of the pneumatic cylinder 12, which is directed downward.
The shaped bar 1 1 is advantageously provided, at the other end, with an appendage 1 1 A bent nearly as a square, in a manner such that it is parallel to the abovementioned movement direction Y, said appendage 1 1 A being provided for slidably engaging a guide hole 13A obtained in said flange 13.
In the illustrated non-limiting embodiment, the flange 13 has shape suitable for defining the abovementioned Venturi tube initial section 4A of the suction means 4.
It is easy to comprehend that the shaped bar 1 1 , being moved with reciprocating motion, prevents the formation of lumps, breaking them up if present, without however constituting an obstacle for the flow of material M into the lower inlet mouth 4B (see Fig. 7 in particular).
In a second embodiment of the separator device 10, not shown, said stirrer member 1 1 is constituted by an articulated blade, arranged substantially parallel to said lower inlet mouth 4B and driven with reciprocating oscillating movement, according to a direction nearly parallel to the same mouth 4B, with pre-established frequency. In a third embodiment of the separator device 10, also not shown, said stirrer member 1 1 is constituted by an articulated blade, arranged substantially parallel to said lower inlet mouth 4B and driven with reciprocating oscillating movement, according to a direction nearly perpendicular to the same mouth 4B, with pre-established frequency.
In a fourth embodiment of the separator device 10, also not shown, said stirrer member 1 1 is still constituted by an articulated blade, arranged substantially parallel to said lower inlet mouth 4B and driven with continuous or reciprocating circular movement.
For all of the above-indicated embodiments of the separator device 10, and for other possible variants, the actuator 12 can indifferently be of pneumatic type, like the cylinder associated with the shaped bar 1 1 , or of electromechanical type, or of electromagnetic type.
From that stated above, the positive characteristics of the present separator device are clear; in all described embodiments, such device acts effectively in order to prevent the formation of lumps in the suction zone and to ensure the continuity of the feeding of the material.
The proposed separator device is of simple conception, being in practice constituted by only two elements, and minimal bulk, such to avoid obstructing the operation of the tube suction means associated thereto, as well as other functional characteristics of the machine.
It can be comprehended that the device, in each of the above-indicated embodiments, is suitable for most granular or powder materials that are normally treated with said tube suction means; nevertheless, its conformation allows optimizing the shape of the separator member and its movement in order to make it extremely effective with specific materials and/or with particular grain sizes thereof.
The structural simplicity employed allows limiting the device production costs to a minimum.
It is however intended that that described above has exemplifying and non-limiting value, hence possible detail variants that may be necessary for technical and/or function reasons are considered to fall within the same protective scope defined by the below-reported claims.

Claims

1 . Separator device associated with a group for feeding granular or powder material, said group (3) being of the type comprising tube suction means (4), at least partially immersed in said granular or powder material (M), and adapted to draw the latter through a lower inlet mouth (4B), at which reduced pressure is generated aimed to suck the material (M) itself, to introduce it inside said tube suction means (4) and to project it at speed towards a feeding zone (A) situated downstream, with the aforesaid device (10) characterized in that it comprises at least one stirrer member (1 1 ), arranged in proximity to said lower inlet mouth (4B), driven by a relative actuator (12) according to a pre-established movement cycle, adapted to apply, to said granular or powder material (M), mechanical stresses adapted to prevent the spontaneous aggregation of the grains of the same material (M) located therein, or to break up possible previously formed lumps.
2. Device according to claim 1 , characterized in that said stirrer member (1 1 ) is constituted by a shaped bar, arranged substantially parallel to said lower inlet mouth (4B) and driven with reciprocating rectilinear movement according to a direction parallel to the axis of said tube suction means (4) and with pre-established frequency.
3. Device according to claim 2, characterized in that said shaped bar (1 1 ) has one end thereof fixed to the relative actuator (12) and it is provided, at the other end, with an appendage (1 1 A) bent nearly as a square, in a manner such that it is parallel to the movement direction imparted by the abovementioned actuator (12) to the shaped bar (1 1 ) itself, said appendage (1 1 A) being provided for slidably engaging a guide hole (13A) obtained in a flange (13), with the latter associated with said tube suction means (4) at the abovementioned lower inlet mouth (4B).
Device according to claim 1 , characterized in that said stirrer member (1 1 ) is constituted by an articulated blade, arranged substantially parallel to said lower inlet mouth (4B) and driven with reciprocating oscillating movement according to a direction nearly parallel to the same mouth (4B), with pre-established frequency.
Device according to claim 1 , characterized in that said stirrer member (1 1 ) is constituted by an articulated blade, arranged substantially parallel to said lower inlet mouth (4B) and driven with reciprocating oscillating movement according to a direction nearly perpendicular to the same mouth (4B), with pre-established frequency.
Device according to claim 1 , characterized in that said stirrer member (1 1 ) is constituted by an articulated blade, arranged substantially parallel to said lower inlet mouth (4B) and driven with continuous or reciprocating circular movement.
Device according to any one of the preceding claims, characterized in that said stirrer member (1 1 ) is driven by an actuator (12) of pneumatic type.
Device according to any one of the preceding claims, characterized in that said stirrer member (1 1 ) is driven by an actuator (12) of electromechanical type.
Device according to any one of the preceding claims, characterized in that said stirrer member (1 1 ) is driven by an actuator (12) of electromagnetic type.
10. Device according to claim 2, characterized in that said shaped bar (1 1 ) is driven by a linear actuator (12) constituted by a pneumatic or hydraulic cylinder.
EP15703103.0A 2014-01-08 2015-01-07 Separator device associated with a group for feeding granular material Withdrawn EP3092190A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPR20140001 2014-01-08
PCT/IB2015/050123 WO2015104665A1 (en) 2014-01-08 2015-01-07 Separator device associated with a group for feeding granular material

Publications (1)

Publication Number Publication Date
EP3092190A1 true EP3092190A1 (en) 2016-11-16

Family

ID=50190592

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15703103.0A Withdrawn EP3092190A1 (en) 2014-01-08 2015-01-07 Separator device associated with a group for feeding granular material

Country Status (2)

Country Link
EP (1) EP3092190A1 (en)
WO (1) WO2015104665A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3734127A1 (en) * 1987-10-09 1989-04-20 Festo Kg Machine for machining workpieces
DE9213562U1 (en) * 1992-04-22 1993-02-11 Kessler, Valentin, 7401 Hirrlingen Extraction device for a chisel hammer
NL1017599C2 (en) * 2001-03-14 2002-09-17 Mario Stoutjesdijk Pneumatic chisel hammer for working stone, has suction nozzle joined directly to chisel
DE102012213750A1 (en) * 2012-08-03 2014-02-27 Robert Bosch Gmbh Suction device for sucking dust during operation of chisel hammer, has suction element arranged on side next to insert tool of hand-held power tool, where suction element encloses insert tool in specific angular range

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4449671A (en) * 1981-04-15 1984-05-22 Hylsa, S.A. Apparatus for separating agglomerated particulate matter
DE10240753A1 (en) * 2002-08-30 2004-03-18 Helmut Schellinger Storage for bulk goods, removal device and method for removing bulk goods
WO2004028931A1 (en) * 2002-09-25 2004-04-08 Yves Dietrich Device for suctioning a powdery product
DE202010006010U1 (en) * 2010-04-23 2010-07-22 Wilhelm, Klaus vibration unit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3734127A1 (en) * 1987-10-09 1989-04-20 Festo Kg Machine for machining workpieces
DE9213562U1 (en) * 1992-04-22 1993-02-11 Kessler, Valentin, 7401 Hirrlingen Extraction device for a chisel hammer
NL1017599C2 (en) * 2001-03-14 2002-09-17 Mario Stoutjesdijk Pneumatic chisel hammer for working stone, has suction nozzle joined directly to chisel
DE102012213750A1 (en) * 2012-08-03 2014-02-27 Robert Bosch Gmbh Suction device for sucking dust during operation of chisel hammer, has suction element arranged on side next to insert tool of hand-held power tool, where suction element encloses insert tool in specific angular range

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2015104665A1 *

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