DE19737683C1 - Pump for viscous material cartridges - Google Patents

Abstract

The pump has a casing with at least one compression chamber (2) in which a piston (3) reciprocates. a hand drive lever (4) operates the piston. The lever has a grip (11) with a connected transmission (5) to increase the force of the lever (F). The lever provides an increasing drive force on the piston (S) for a constant hand applied force. The transmission has at least one lever (6) between the piston and grip. There can be two levers which are connected together, one mounted to the piston and the other to a point opposite the compression chamber.

Description

The invention relates to a device for compressing air Emptying a cartridge filled with a viscous mass using compressed air, with a housing with at least one compression chamber in which there is a piston located in the stroke direction between a rest position in which the piston limited volume of the compression space is maximum, and one Compression position in which the volume limited by the piston is minimal and movable here, and with means for driving the piston, these Drive means can be operated by hand.

Compressed media are used on a large scale to drive plants and plants witness, etc. used. One example would be pneumatic work witnesses that are operated by compressed air. The advantages of using one Such compressed medium for driving are varied. So with help a force over longer distances and over a compressed medium irregularly shaped paths are transmitted. They are also condensed Media are usually clean and hardly flammable, and they require aside from a good seal, no special measures on the tool.

However, the use of compressed media for the drive has the disadvantage that it are not particularly suitable for small-scale applications. For Compression of a medium usually becomes a large compression device such as motor-driven compressors that used the medium in out sufficient quantities can be compressed, so as to be a large number of To supply systems or tools. The tools can be connected via a line for the compressed medium can be connected to the compressor. This is However, this only makes sense if there are many pneumatically operated locations Devices are located, such as in workshops, factories, etc.

It is also known to pressurized media under pressure in containers preserve and the containers of equipment and tools to drive through the  to connect compressed medium. In practice, this proves to be the case for Small-scale applications are also not very practical because Containers for storing compressed media because of the pressure exerted on them Pressure must be robust and consequently heavy.

Cartridge guns are also known, for example from DE 32 00 542 A1 for squeezing a viscous mass, e.g. B. a joint sealant Cartridges. Usual cartridge pistols have a cartridge holder, one Pistol grip and a piston which, when actuated, is attached to the pistol grip brought handle lever, the front end of the cartridges pointing away from the handle holder is pushed so that the piston of the pistol in the cartridge bottom presses the cartridge casing and thus the viscous mass from a nozzle tip at the other end of the cartridge.

The application of the highly viscous mass usually requires great care when guiding the nozzle tip to apply the mass evenly. The same The order of the day does not depend on the known cartridge pistols only on the speed at which the nozzle tip is guided along the joint but also on the handle of the cartridge gun agile pressure. The simultaneous observance of these two parameters in the Processing of the highly viscous mass, namely the speed of the nozzles point along the joint and the pressure exerted on the pistol grip, difficult Careful processing of the cartridge contents, especially for do-it-yourselfers.

Cartridge guns are known in which the cartridge base is by means of Compressed air is pressed towards the cartridge nozzle. Here comes the viscous Mass during processing automatically and evenly from the cartridge nozzle so that the user can concentrate solely on the nozzle tip to run along the joint at a constant speed. As before As explained above, such cartridge guns require a comm pressor for compressed air generation or a storage container for compressed air and are therefore only used by craftsmen. This is one for DIY enthusiasts Combination of compressor and cartridge gun too expensive.

Should the compressed air be used manually with a cartridge gun working with compressed air other problems arise. On the one hand, there is the viscous mass requires a relatively high pressure of at least about 3 bar cannot be applied manually without difficulty. The other is increasing the pressure of a compressible medium such as air with increasing compression  very strongly, so that when the pressure builds up from the user's hand bringing force on the cartridge gun also changes greatly. This, depending on the existing internal pressure required different manual force acts for very annoying to the user of it from the usual mechanical cartridges is used to an essentially constant manual force on the pistols Use a cartridge gun to squeeze out the viscous mass.

The object of the invention is therefore a comparatively small, light, compact and easy-to-use device for compacting a medium wind that is suitable for example for driving a single tool.

This object is achieved in the device for compressing Air solved in that the drive means a manual control handle and associated transmission device for amplifying the hand have trained driving force and with constant force exerted on it by hand Force to generate an increasing in the stroke direction of the piston Driving force on the piston are designed, the transmission device at least one between the piston and the hand control handle has first lever.

Since the compression device according to the invention is operated by hand, can they are compact, light and simple, and manufactured at low cost become. In addition, the device is particularly as manually operated with compressed air Cartridge gun suitable because the user hand on the one hand only a constant or needs to apply almost constant force to the drive means in order to compressible media along the stroke increasing force on the piston to exercise, and on the other hand the generated at the end of the stroke and to the end Press the viscous mass out of the cartridge, the minimum pressure of about 3 bar as easy and convenient as the relatively low initial pressure at the beginning the stroke can generate.

If the minimum pressure required to move the cartridge bottom and so that the viscous mass can be pressed out, the user needs himself in contrast to the usual mechanical cartridge guns no longer active to take care of the squeezing process, but can fully concentrate on it the nozzle tip of the cartridge evenly along the joint to be filled respectively. Only after a long time when the pressure due to the volume Enlargement of the interior of the cartridge below the bottom of the cartridge a critical limit has dropped and the bottom of the cartridge is no longer in  Moving towards the nozzle tip, the pressure must be built up again manually become.

The transmission device has at least one first lever located between the piston and the hand control handle. The leverage can exert a large force on the medium to be compressed. By means of a lever connected to the piston via a joint, the orientation and thus the force transmission ratio of which depends on the position of the piston, it can be achieved that the manual force is amplified the closer the piston is to its top dead center, that is Position, maximum compression. In this way it can be achieved that, despite constant manual force, a force which increases with the stroke travel acts on the piston. A concrete example of this can be found in FIG. 6 and is described in detail below.

A particularly simple design of the compression device is achieved when the transmission device has at least two articulated levers, one of which is connected to the piston and the other to a point fixed relative to the compression space, the manual control handle on the articulated connection attacks (claim 2). Here, too, the manual force is increased the closer the piston is to the position of maximum compression, so that despite the constant manual force, a force that increases with the stroke acts on the piston. A concrete example can be found below in the description of FIGS. 1 to 3.

The hand control handle is included so that operation is as simple as possible preferably pivotally connected to the housing, and it has one with the Articulated joint interacting sliding surface (claim 3).

The drive means can also be compared to the rest position of the piston be taut (claim 4), so that when no force is exerted on it to its end return to the normal position and the device is thus always ready for operation.

The device preferably has Ent connected to the compression chamber ventilation means (claim 5). The pressure can simply escape through this.

For this purpose, the ventilation means can have at least one ventilation opening and a cooperating spring-biased one manually operable pressure relief valve (claim 6). Such pressure The relief valve therefore does not only open when the pressure created exceeds the preset value, but it can also be operated by the user be, for example, the operation of one using the compressed medium interrupt the operated device if necessary.

A constructionally simple execution is achieved if that Pressure relief valve projecting over the vent opening Has actuating arm that to perform a pivoting movement around Edge of the vent opening is designed (claim 7). In this way, the pressure can be Open the relief valve by pressing the actuating arm.

The pressure relief valve is also advantageously pivotable about a free end of the operating arm executed (claim 8), so that this Exceeded a certain pressure level and thus the valve is opened.

To ensure correct pressure build-up in the compression chamber, this preferably an outlet which can be closed by a check valve Opening on (claim 9).  

The check valve can be located in the outlet opening Thickened ends have limited pin-shaped body, one end is designed to close the outlet opening and the other end is designed to hold the pin-shaped body in the outlet opening (claim 10). On this creates a check valve that is simple from a design point of view but is pressure resistant at relatively high pressures.

A very compact and handy compaction device is achieved by whom the compression chamber and the drive means are integrated in one handle (claim 11).

This handle can be part of a tool, preferably one Cartridge gun, or in a simple way with a tool for Drive connected by the compressed medium (claim 12). The device has for this purpose means for attaching the handle to a container for a viscous mass, in particular joint sealant, on the one by the compressed medium movable piston, e.g. Legs of the usual cartridge bottom for squeezing the mass (claim 13). In this way, the Compaction device in connection with such a container, for example, a conventional cartridge for a joint sealant, with Advantage can be used.

The fasteners can have a threaded part, but it would also be possible that they have snap connection parts for this (claim 14, 15).

In the following, exemplary embodiments of the invention are described with reference to drawing described in more detail. Show it

Fig. 1 a cross section of the invention when the piston is located through a first embodiment of the sealing device according Ver in the rest position,

Fig. 2 is a side view of a second embodiment of the Ver sealing device in the rest position, wherein the venting means have been removed,

Fig. 3 shows a cross-section of the compression device of FIG. 2 at the end of a compression stroke,

FIGS. 4A to 4C are schematic detail views showing the operation of the venting means of the apparatus of Fig. 1 it can be seen

Fig. 5 shows the region of the connection of a container with the compression device according to the invention in cross section,

Fig. 6 is a schematic side view of a variant of the drive means of the compression device according to the invention and

Fig. 7 is a diagram in which the increase in driving force is shown as the piston stroke increases.

In all drawings, the same reference numerals have the same meaning and may therefore only be explained once.

A device 1 for compressing a medium, for. B. air, comprises a housing with a compression chamber 2 , in which there is a piston 3 which is movable back and forth in the stroke direction (represented by arrow S) ( Fig. 1). The compression device 1 also has means 4 for driving the piston 3 , the drive means 4 being designed with constant force on the manual control handle 11 for generating a drive force F increasing in the stroke direction S of the piston on the piston 3 , as is the curve 63 in Fig. 7 shows. The compression chamber 2 and the drive means 4 are integrated in a handle 15 , which is on the top by a cover 64 which by means of fastening means 65 , for. B. screws, is attached to the handle 15 is completed. For convenient handling, the grip part of the handle 15 can have a projection 43 on the side opposite the hand control handle 11 ( FIGS. 2 and 3).

The drive means 4 have a transmission device 5 for amplifying a drive force F exerted by hand. The transmission device 5 is with a first. Provide lever 6 , which is located between the piston 3 and a manual control handle 11 of the compression device. The lever 6 is articulated via an axis 10 to a piston rod 16 which is fixedly connected to the piston 3 and can be moved back and forth in a straight line in the stroke direction S. For this purpose, the piston rod 16 on the underside of a bearing roller 18 rotatable about the joint axis 10 , which is movable along a bearing sliding surface 17 which is part of the handle 15 . The opposite end of the lever 6 is connected via a pivot axis 8 to a bearing roller 14 which can be moved along a sliding surface 13 of the manual control handle 11 . One end of a second lever 7 is also connected to the axis 8 , the other end of which is pivotally connected to the handle 15 via an axis 9 . On the second lever 7 acts a torsion spring 23 , which is attached to a firmly connected to the hand 15 pin 24 and this lever 7 and consequently the hand control handle 11 , the first lever 6 and the piston 3 in the reproduced in Fig. 1 Rest position holds.

The piston 3 is composed of a fixed on the piston rod 16 of piston disc 20 on which a piston member 21 of an elastic material is placed, said piston element 21 has a circumferential edge 22, the gas close to the rests the compression chamber 2 wall delimiting 19th The piston element 21 has an opening 25 through which a plate 20 attached to the piston protrudes mounting pin 26 .

The compression device 1 also consists of venting means 27 which are connected to the compression space 2 . The venting means 27 have a vent opening 28 and a prestressed by a spring 30 , the vent opening 28 closing pressure relief valve 29 , which can also be operated manually. The pressure limiting valve 29 has an actuating arm 54 which projects beyond the vent opening 28 and is designed such that a pivoting movement can be carried out both around an edge 35 of the vent opening 28 and around the end of the actuating arm 54 , as will be explained in more detail below. In addition, the compression chamber 2 has an outlet opening 36 , which is closed by a check valve 37 , the shape and mode of operation of which are also explained in more detail below. Finally, the compression device 1 has means 38 for fastening the handle 15 to a container 39 for a viscous mass, the fastening means in the example shown consisting of a holder with an enlarged end 40 , into which one end 41 of the container 39 is pushed and then is clamped in the handle 15 by means of a ring 42 which is pushed between the widened end 40 and the wall of the container 39 .

The venting means 27 comprise, as already mentioned, a vent opening 28 , which communicates with the compression chamber 2 via the opening 36 in the top wall 53 and is also connected via a channel 52 to the container arranged in the sealing device. The vent opening 28 is closed by the pressure relief valve 29 which is pivotally connected via the end 32 of the actuating arm 54 with a push button 31 connected. This pushbutton 31 has a peripheral edge 51 which is held by a peripheral edge 34 of a sleeve 33 , the sleeve 33 in turn being fastened by a snap edge 50 to the part 49 of the cover 64 which projects around the ventilation opening 28 . Between the pressure limiting valve 29 and the push button 31 there is a compression spring 30 , the elasticity of which has been selected so that the valve 29 is at a certain, preset excess pressure, for. B. 4 bar opens.

If the pressure in the compression chamber 2 does not exceed the preset overpressure level, the pressure relief valve 29 is at rest, and closes the ventilation opening 28 in an airtight manner ( FIG. 4A). If the pressure in the compression chamber 2 and / or in the channel 52 , which communicates with the space behind the container 39 , exceeds the preset pressure level, the pressure relief valve 29 rises against the force of the biasing spring 30 , so that air from the compression chamber 2 and the channel 52 flows in the direction indicated by the arrow OP through the vent opening 28 into the space delimited by the sleeve 33 and the push button 31 ( FIG. 4C). This room is not airtight, so that the air in this room can escape into the environment. As soon as enough air has escaped and the pressure in the compression device 1 drops below the preset limit value, the valve 29 is closed again by the biasing spring 30 .

The pressure relief valve 29 can also be operated by hand. This can be useful if the pressure is to be reduced quickly, for example to interrupt a processing carried out by the resulting pressure. For this purpose, only a pressure force F needs to be exerted on the push button 31 , the push button 31 in the sleeve 33 being pressed down until the peripheral edge 51 rests on the edge of the part 49 of the cover 64 . The valve 29 is pivoted about the edge 35 of the vent opening 28 so that the opening is released and air under pressure in the direction indicated by the arrow V from the channel 52 and the space behind the container 39 can deviate ( Fig. 4B). The opening 36 in the top wall 53 of the compression chamber 2 remains closed by the check valve 37 until the pressure in the channel 52 is lower than the pressure in the compression chamber 2 , after which the check valve 37 rises, as shown in FIG. 4C.

The check valve 37 also consists of a pin-shaped body 44 which is delimited at the upper end by a hemispherical part 46 and at the lower end by a hemispherical part 45 . The hemispherical upper part 46 is adapted to the side wall of a conical valve seat 47 of the outlet opening 36 in the top wall 53 of the compression chamber 2 and closes the opening 36 in this way in the rest position from airtight ( Fig. 4A and 4B). The thickened lower part 45 mainly serves to hold the check valve 37 in the opening 36 . The thickened lower part 45 and the pin-shaped body 44 of the check valve 37 also have a recess 48 over the entire width of the check valve 37 , so that a gas connection is formed between the compression chamber 2 and the conically tapering valve seat 47 of the outlet opening 36 .

For attachment of the container 39 at the compacting device 1 can be used instead of the clamp connection shown in FIG. 1, a threaded connection (Fig. 5) are used. In this case, a projecting part 55 with a threaded profile is connected to the rear end 41 of the container 39 , the part 55 having a channel 57 in the longitudinal direction. The projecting part 55 is screwed into a threaded part 56 of the cover 64 , the threaded part 56 having at least one opening connected to the channel 52 for the medium compressed by the compression device 1 . For optimal sealing, there is an O-ring 59 between the container 39 and the lid 64 , while a profiled sealing ring 58 lies between the container 39 and the shoulder 55 .

The operation of the device will now be described in detail. After a container 39 , e.g. B. a filled with joint sealant cartridge has been attached to the compression device 1 , for. B. by means of a threaded, snap or clamp connection, a pressure is built up by repeated actuation of the piston 3 in the compression chamber 2 filled with the medium, usually air, it being possible for operations to be carried out subsequently under the influence of this compressed air, such as, for example Movement of a piston located in the container 39 and not shown here, through which a viscous mass is pressed out of the container 39 . In this way, the compression device 1 can be used in connection with the container 39 as a pneumatic gun for joint sealants.

To build up the gas pressure, the manual control handle 11 can be repeatedly pulled toward the handle 15 , the manual control handle 11 performing a pivoting movement about an axis 12 . During this movement, a force, directed in the example to the right, is exerted on the two levers 6 , 7 , this force finally being converted into a movement of the piston 3 in the compression chamber 2 which is directed upwards in the stroke direction S. The force exerted by the hand is amplified by the levers 6 , 7 , the transmission device being designed so that with a constant force on the hand control handle 11, the force F generated at the end of the stroke S of the piston 3 is greatest ( Fig . 7). This is of great importance for the compression of a compressible medium such as air, since the force required for the compression increases comparatively quickly, especially when the volume of the medium is greatly reduced.

The compressed medium finally flows from the compression chamber 2 through the opening 36 , which is opened by the check valve 37 , since the pressure in the compression chamber 2 is higher than in the channel 52 , which leads to the space behind the container 39 . After each stroke of the piston, the lever 7 and consequently the entire drive device 4 and the piston 3 return to the rest position under the action of the biasing spring 23 . The elastic side wall of the piston element 21 bends inward, and air flows from the outside via the peripheral edge 22 into the compression chamber 2 .

If, for example, an outlet of the container 39 is now opened, the pressure created behind the container 39 will force the mass out of the container 39 , the compressed medium gradually expanding again and the pressure consequently falling. The user can now fully rely on the distribution of the viscous mass emerging evenly from the cartridge, e.g. B. along a joint, concentrate without his attention being distracted by the squeezing process. In order to be able to interrupt the delivery of the mass from the container 39 as quickly as possible, the pressure limiting valve 29 can simply be actuated by actuating the pushbutton 31 . In addition, the pressure relief valve 29 , as explained above, will open automatically if the pressure in the compression chamber 2 exceeds a preset limit value when the pressure builds up (“pumps”).

Although the invention has been explained above with the aid of examples, it is apparent to the person skilled in the art that the described compression device can be varied in many ways within the scope of the invention. For example, instead of a container filled with a viscous mass, a hose could be attached to the compression device 1 so that processing can be carried out at another location with the aid of the compressed medium.

Another example is shown in Fig. 6, the solid and dashed lines showing two different positions of the piston 3 , 3 'and the drive mechanism. The reference symbols provided with an apostrophe relate to the parts of the device in the position shown in dashed lines.

Here is used instead of the pivotable hand control handle a straight ver sliding operating handle 11 'with rod 60 , the second lever 7 being omitted. One end of the first lever 6 , 6 'is connected to a pin 61 , 61 ', which is displaceable along a sliding surface 62 . In this way, a comparable movement of the piston 3 can be achieved, the increase in force being as explained above.

Furthermore, instead of the hand-operated printing described above limit valve also only reacts to overpressure Valve and a separate, manually operated vent valve used become.

Claims (15)

1. Device for compressing air for emptying a cartridge filled with a viscous mass by means of compressed air, with a housing with at least one compression chamber ( 2 ), in which there is a piston ( 3 ) which is in the stroke direction (S) between a rest position, in which the volume of the compression space ( 2 ) limited by the piston ( 3 ) is maximum, and a compression position in which the volume limited by the piston ( 3 ) is minimal, can be moved back and forth, and by means ( 4 ) for driving the Piston ( 3 ), said drive means ( 4 ) being operable by hand, characterized in that the drive means ( 4 ) has a manual control handle ( 11 ) and a transmission device ( 5 ) associated therewith for amplifying the drive force practiced by hand (F ) and with constant force exerted by hand on it to generate a driving force (F) increasing in the stroke direction (S) of the piston ( 3 ) on the piston ( 3 ), wherein the transmission device ( 5 ) has at least one first lever ( 6 ) located between the piston ( 3 ) and the manual control handle ( 11 ). 2. Device according to claim 1, characterized in that the transmission device ( 5 ) has at least two articulated ver connected levers ( 6 , 7 ), one of which ( 6 ) with the piston ( 3 ) and the other ( 7 ) with a point relative to the compression chamber ( 2 ) is connected, the manual control handle ( 11 ) engaging the articulated connection. 3. Apparatus according to claim 2, characterized in that the manual control handle ( 11 ) is pivotally connected to the housing and has a sliding surface ( 13 ) cooperating with the articulated connection. 4. Device according to one of the preceding claims, characterized in that the drive means ( 4 ) against the rest position of the piston ( 3 ) are biased. 5. Device according to one of the preceding claims, characterized by ventilation means ( 27 ) connected to the compression chamber ( 2 ). 6. The device according to claim 5, characterized in that the venting means ( 27 ) have at least one vent opening ( 28 ) and a cooperating, by a spring ( 30 ) biased, manually operated pressure relief valve ( 29 ). 7. The device according to claim 6, characterized in that the pressure relief valve ( 29 ) has a via the vent opening ( 28 ) before jumping actuating arm ( 54 ) which is designed to perform a pivoting movement around an edge ( 35 ) of the vent opening ( 28 ) . 8. The device according to claim 7, characterized in that the pressure relief valve ( 29 ) is pivotable about a free end of the actuating arm ( 54 ). 9. Device according to one of the preceding claims, characterized in that the compression chamber ( 2 ) has an outlet opening ( 36 ) which can be closed by a check valve ( 37 ). 10. The device according to claim 9, characterized in that the check valve ( 37 ) in the outlet opening ( 36 ) located by thickened ends ( 45 , 46 ) limited, pin-shaped body ( 44 ), the one end ( 46 ) is designed to close the outlet opening ( 36 ), and the other end ( 45 ) is designed to hold the pin-shaped body ( 44 ) in the outlet opening ( 36 ). 11. Device according to one of the preceding claims, characterized in that the compression chamber ( 2 ) and the drive means ( 4 ) are integrated in a handle ( 15 ). 12. The apparatus according to claim 11, characterized in that the handle ( 15 ) is part of a cartridge gun, in which a filled with a viscous mass, in particular joint sealant, container ( 39 ) can be arranged, the movable piston through the compressed medium ble for squeezing the mass. 13. The apparatus of claim 11 or 12, characterized by means ( 38 ) for fastening the handle ( 15 ) to a container ( 39 ) for a viscous mass, in particular joint sealant, which has a movable piston through the ver sealed medium for squeezing the mass . 14. The apparatus according to claim 13, characterized in that the fastening means ( 38 ) have a threaded part. 15. The apparatus according to claim 13, characterized in that the fastening means ( 38 ) have snap connection parts.