Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
  • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
  • B05C17/01—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with manually mechanically or electrically actuated piston or the like
  • B05C17/0146—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with manually mechanically or electrically actuated piston or the like comprising a valve in the proximity of the nozzle that is not actuated by pressure, e.g. manually actuated
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
  • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
  • B05C17/00576—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes characterised by the construction of a piston as pressure exerting means, or of the co-operating container
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D83/00—Containers or packages with special means for dispensing contents
  • B65D83/771—Containers or packages with special means for dispensing contents for dispensing fluent contents by means of a flexible bag or a deformable membrane or diaphragm
  • B65D83/7713—Containers or packages with special means for dispensing contents for dispensing fluent contents by means of a flexible bag or a deformable membrane or diaphragm the contents of a flexible bag being expelled by a piston, or a movable bottom or partition provided in the container or the package

Definitions

• Sealing gap opens and the mass can penetrate into the space to be sealed between the sealing ring and tubular bag on the one hand and the cylinder space on the other.
• the mutual centering can also be lost, so that the cone of the sealing ring is not returned to the correct seat the next time it is pressed on. Soiling of the device can therefore not be completely avoided by the known arrangement.
• the emptying opening must be carefully cleaned when changing the tubular bag, because otherwise residues of the mass remaining there and possibly solidified make a complete seal impossible even when the extrusion force is acting, which then leads to further contamination of the device .
• the known type of sealing also requires careful manufacture and assembly of the parts involved in the sealing, which is complex.
• the invention has for its object to provide an arrangement of the type specified in the preamble of claim 1, which is less expensive, enables easy replacement of the tubular bag and still ensures an adequate seal.
• the exclusive action of the sealing elements of the sealing ring on the end face surrounding the drain opening or on the edge of the drain opening formed by it makes a careful cleaning of the less accessible drain opening unnecessary. It is also often unnecessary to clean the face, because experience shows that the mass rarely penetrates so far. Any residual mass is displaced in the area of the edge without impairing the sealing effect.
• the interacting sealing surfaces place less demands on precise manufacture and assembly, because it is not necessary to match any diameters exactly to one another.
• the invention has the advantage that the seal is independent of the particular design of the emptying opening and the tubular bags can therefore be used in different squeezing devices. The sealing effect cannot be impaired by any inclination of the sealing ring.
• the end face surrounding the emptying opening of the squeezing device is flat. Then it is advisable to also remove the sealing ring (apart from protruding sealing elements) form so that it can extend parallel to the end face.
• the sealing ring (apart from protruding sealing elements) form so that it can extend parallel to the end face.
• it has an outer diameter approximately equal to the diameter of the cylinder space. This ensures good guidance and centering of the tubular bag end when it is inserted into the discharge opening.
• the edge of the sealing ring has a considerable height, which prevents the sealing ring from tilting when the tubular bag is inserted into the cylinder space from the rear side remote from the dispensing side. This height is preferably at least 4 mm or 6% (better 10%) of the diameter.
• the circumferential surface is conical or beveled or rounded on one or both edges, in whole or in part, in order to facilitate introduction into the cylinder space and possibly also to avoid tilting.
• the sealing ring can be provided with a holding part which locks it in the sealing position according to a further feature of the invention.
• the invention prefers two embodiments of this idea. The first is characterized in that the holding part is designed as a clamp which interacts with the inner wall of the cylinder space. This is preferably due to the fact that the holding part is designed as a clamp which interacts with the inner wall of the cylinder space. This is preferably due to the fact that the holding part is designed as a clamp which interacts with the inner wall of the cylinder space. This is preferably due to the fact that the holding part is designed as a clamp which interacts with the inner wall of the cylinder space. This is preferably due to the fact that the holding part is designed as a clamp which interacts with the inner wall of the cylinder space. This is preferably due to the fact that the holding part is designed as a clamp which interacts with the inner wall of the cylinder space. This is preferably due to the fact that the holding part is designed as a clamp which interacts with the inner wall of the
• Washer forming or holding disc is flexible and its outer diameter is a little larger than the inner diameter of the cylinder space. If the disc is pushed against the end face during the squeezing action of the piston, its outer edge, which rests against deformation on the inner surface of the cylinder space, bends slightly to the rear, the angle between this edge and the normal to the cylinder wall being so small in longitudinal section that self-locking takes place. This means that the disc is held in the position it has been given. When the piston force ends, it cannot retreat and the sealing elements remain pressed against the end face under the elastic force of the disk deformation. Breathing is prevented in this way different.
• the disc is equipped with a suction holder which holds it on the end face. It can be one or more suction cups.
• a braking element is arranged at the rear end of the tubular bag, which holds the bag in the respective position in the cylinder space. Friction also prevents the bag from sliding backwards or even falling out of the cylinder when the cylinder is removed and placed vertically with the outlet opening upwards. Characterized in that when the bag is inserted into the cylinder space, the pull-in force is exerted directly on the braking member arranged at the rear end of the tubular bag, it does not have to be transmitted to the braking member via the bag and its contents and therefore does not affect the internal pressure of the bag.
• FIG. 1 shows a schematic longitudinal section through a cartridge containing the tubular bag
• FIGS. 2 to 4 partial sections through the bottom area of the cartridge with different sealing rings
• Fig.l shows the tubular bag 1 within a so-called.
• Cartridge 2 which comprises a wall 3 and a bottom 4. Their inside diameter is dimensioned to match that of the tubular bag 1. Cartridges of this type with tubular bags are considered
• Interchangeable inserts are used in devices for dispensing plastic materials, for example in devices for dispensing dental multi-component impression materials (EP-A 492 413).
• the cartridges are inserted into the device so that a device-owned piston 5 can penetrate in the direction of the arrow into the open end 6 of the cartridge which is remote from the floor in order to press out the tubular bag 1.
• the gathered end 7 of the bag, which is closed in the storage state, is cut off at the other end so that a bag opening 8 is formed which opens into an emptying opening 9 located in the bottom 4 of the cartridge.
• a sealing ring 13 is inserted between the end face 11 of the base 4 facing the cylinder space 10 of the cartridge and the shoulder surface 12 of the tubular bag 1.
• the mass contained therein can flow through the bag opening 8 and the emptying opening 9 into the downstream rooms (not shown) of the device, for example in order to be mixed with another component and finally in the desired manner to be deployed.
• the pressure generated by the piston in the tubular bag 1 also acts on the sealing ring 13 via the shoulder surface 12, so that it forms an effective seal between the end surface 11 and the shoulder surface 12 at least during the pressing-out process.
• the gathering 7 is pressed against the wall surface of the discharge opening 9, so that a ballast seal is formed at this point.
• the term cylinder space is not intended to mean that the wall 3 must be cylindrical; however, it is expedient.
• Fig. 1 it is assumed that the bottom 4 of the cartridge is firmly connected to its wall 3 and the tubular bag 1 is inserted into the cartridge from the side remote from the dispensing side.
• the bottom can be detached from the wall 3 in a cover-like manner for inserting the tubular bag 1.
• Shoulder surface 12 of the tubular bag 1 may be glued. Their outer diameter is not significantly smaller than that of the cylinder space 10. When the tubular bag is inserted into the cartridge can therefore be used to center the bag opening with respect to the emptying opening. It is made of stiff plastic to perform this task. It also expediently has such a high strength that it can secure the approximately flat or parallel to the end face 11 position of the washer 14.
• an O-ring 15 (there may also be several) is tightly and preferably firmly connected to the annular disc 14, for example by being glued or clamped into an annular groove. It consists of soft rubber or foam rubber with a closed surface and therefore lies under the pressure acting during the squeezing process without a gap on the end face 11 and thus forms an effective protection against the penetration of mass from the emptying opening 9, if mass between the gathering 7 and the wall of the discharge opening 9 should pass through.
• the O-ring 15 has moved so close to the emptying opening 9 that it interacts with the edge thereof, which improves the sealing effect.
• the annular disc 14 can, as shown in FIG. 3, be provided with a raised edge 27.
• FIG. 3 shows that the sealing ring, designated overall by reference number 13, consists of a disk 16 and a rubber-elastic O-ring 15 secured in a groove thereof, which cooperates in a sealing manner with the end face 11 of the cartridge base 4.
• the disc 16 is connected to the end face 12 of the bag 1 by an adhesive and sealing compound 40.
• the connection is limited to the radially inner region of the disc 16 and the end face 12 and is delimited towards the outside by a bead 41 which is provided in a ring on the end face of the disc 16 facing the bag 1 concentrically with the disc opening and the disc periphery. Outside the annular bead 41, the disk 16 and the bag end face 12 are unconnected and are generally raised slightly from one another.
• the disk 16 can tilt freely in relation to the bag end face 12 within a certain angular range, the bead 41 being pressed into the bag more on one side and less on the other side. Any skewing of the bag, as indicated in FIG. 2, is therefore unable to affect the position of the disk 16 and the sealing effect of the O-ring 15.
• the end face 12 of the bag 1 is connected to the disk 16 of the sealing ring 13 essentially over the entire surface by means of the adhesive 40, so that the disk 16, as indicated in the drawing, is subject to any deformation of the bag participates by misalignment.
• the sealing element of the sealing ring 13 is formed by a central projection 45 with a spherical surface 46.
• the projection surrounds an opening 47 through which the braid 7, which forms the bag opening 8, projects.
• the spherical surface 46 forms the sealing surface on the bag side.
• the counter-sealing surface is formed by the edge 43 which is formed on the bottom 4 of the cartridge at the transition between the end face 11 and its discharge opening 9.
• the edge 43 lies in the plane of the surface 11 and is circular. Their diameter is smaller than the outer diameter of the spherical projection 45. Therefore, the edge 43 on the spherical sealing surface 46 can close along a closed circumferential sealing line. A similar effect is achieved if the sealing surface is conical, provided that its cone angle is substantially obtuse than that of an optionally conical wall 44 of the discharge opening 9.
• the curvature diameter of the spherical sealing surface 46 is considerably larger than the diameter of the sealing edge 43, so that the spherical sealing surface cannot wedge in the edge 43 or the wall 44 of the opening 9.
• the tangent at a point of contact between the spherical sealing surface 46 and the sealing edge 43 forms an angle 48 with the axis of the sealing edge 43, which is expediently greater than 30 °, further advantageously greater than 40 °.
• the angle should be less than 60 ° so that the protrusion 45 automatically centers with respect to the edge 43.
• This design not only has the advantage of being insensitive to misalignment of the sealing ring, but also leads to a particularly reliable seal because the sealing pressure on the edge 43 is high and any contamination is squeezed away.
• the bag 1 is provided on the emptying side with a disk 20, which has a 0-ring 22 at its central opening 21 which passes through the bag end.
• the outer diameter of the disc 20 is a little larger than the inner diameter of the cartridge wall 3.
• the resilient disc therefore deforms in such a way that its outer edge is inclined supports against the cartridge wall 3. This inclined position of the edge 23 with respect to the cartridge wall 3 is also retained when the disk reaches its end position (FIG. 6). If the piston pressure now ends, the disk 20 cannot move back easily because between its edge 23 and the
• Inner surface of the cartridge wall 3 is a self-locking friction ratio.
• the seal 22 therefore remains pressed against the end face 11 under the elastic force of the disk 20. In principle, this also applies if the self-locking effect at the edge 23 of the disc is dispensed with and only some kind of frictional connection is provided between the edge 23 and the cartridge wall 3, the resistance of which is at least of the same order of magnitude as that when breathing on the end face of the Bag acting force due to the back pressure.
• Fig. 7 shows the arrangement with a braking member attached to the rear end of the tubular bag.
• a disc 30 is placed thereon, which contains an opening in the middle for receiving the closure strand 31 of the bag. Their circumference interacts with the inner surface of the cartridge 2.
• Disc 30 therefore has no effect on the internal pressure of bag 1. If the cartridge with the bag contained therein is stored outside the dispensing device and set up vertically with the end 6 downward, the frictional force on the circumference of the disk 30 absorbs the weight of the filled bag 1 and holds it in the existing position.
• the circumference of the disk 30 can be provided with devices which keep the frictional force in a desired range even when there are certain dimensional tolerances of the disk 30 and the cartridge 2, for example with a friction-increasing elastomer ring.
• an embodiment is preferred which, while opposing the backward movement of the bag with a frictional force of the desired height, offers only less resistance when the bag is pushed into the cartridge from its rear end.
• designs are suitable, for example, in which the plane 33, in which the line of contact between the circumference of the disk 30 serving as the braking member and the inner surface of the cartridge 2, is offset to the rear relative to the main plane 34 of the disk.
• the circumference of the disk 30 lying against the inner wall of the cartridge 2 need not be continuous; rather, it can be interrupted, so that a plurality of flexible arms are formed, the ends of which resiliently abut the cartridge wall and are connected to one another only in the central region.
• the axial offset between the contact plane 33 and the main plane 34 of the disk 30 or its arms need not be determined by its original shape; rather, the part can also be designed in a flat manner and only assume the shape bent backwards on the outside by elastic deformation when it is pushed into the cartridge.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
• Coating Apparatus (AREA)

Priority Applications (4)

Applications Claiming Priority (8)

Publications (1)

Family

ID=27439130

Family Applications (2)

Family Applications After (1)

Country Status (5)

Cited By (3)

Families Citing this family (17)

Citations (2)

Family Cites Families (5)

• 1997
  • 1997-08-08 US US09/242,121 patent/US6209755B1/en not_active Expired - Fee Related
  • 1997-08-08 EP EP97940063A patent/EP0915743B1/de not_active Expired - Lifetime
  • 1997-08-08 JP JP10509386A patent/JP2000516138A/ja not_active Ceased
  • 1997-08-08 EP EP97941926A patent/EP0915744A1/de not_active Ceased
  • 1997-08-08 US US09/230,812 patent/US6206244B1/en not_active Expired - Lifetime
  • 1997-08-08 WO PCT/EP1997/004338 patent/WO1998006506A1/de not_active Ceased
  • 1997-08-08 WO PCT/EP1997/004337 patent/WO1998006505A1/de not_active Ceased
  • 1997-08-08 DE DE59703610T patent/DE59703610D1/de not_active Expired - Lifetime
  • 1997-08-08 JP JP10509385A patent/JP2000516137A/ja active Pending

Patent Citations (2)

Also Published As

Similar Documents

Legal Events