Device and method for mixing of a multi-component cement

Abstract

A manually drivable device for the mixing of a pasty mixing ware from at least two fluid starting components comprising at least two cartridges having feed plungers; a mixing space to mix the starting components, mixing vanes being provided in the mixing space and mounted such that they can rotate; a lever rotatable about a pivot point operatable manually or a pin that can be shifted in longitudinal direction and operatable manually in order to operate the device; a gear connected to the lever or pin, and connected to the rotatable mixing vanes in the mixing space; and a facility for propelling the feed plungers such that the motion of the lever or pin drives the rotation of the mixing vanes in the mixing space and motion of the feed plungers into the cartridges. The invention also relates to a method for mixing fluid starting components using the device.

Claims

1. A manually drivable device for mixing of a pasty mixing ware from at least two fluid starting components, said device comprising: at least two cartridges containing the fluid starting components or at least two connectors for at least two cartridges containing the fluid starting components, whereby feed plungers are provided in the cartridges for expelling the starting components from the cartridges; a mixing space for the mixing of the starting components that is connected to the cartridges or connectors for the cartridges such that the starting components are guided into the mixing space when the starting components are expelled from the cartridges by the feed plungers, whereby mixing vanes are provided in the mixing space and are mounted in the mixing space such that they can rotate; a lever that can be rotated about a pivot point and can be operated manually for operation of the device or a pin that can be shifted in the longitudinal direction and can be operated manually in order to operate the device; a gear connected to the lever or pin, whereby the gear is appropriately connected to the rotatable mixing vanes in the mixing space such that the mixing vanes can be rotated in the mixing space upon a motion of the lever or pin mediated by the gear, wherein a clutch is provided in the connection of the gear to the mixing vanes, whereby the clutch allows the mixing vanes to rotate in one direction of rotation and prevents or reduces rotation in the opposite direction of rotation; and a facility for propelling the feed plungers in the cartridges, appropriately connected to the lever or pin such that the feed plungers can be propelled in the cartridges upon a motion of the lever or pin, such that the motion of the lever or pin drives the rotation of the mixing vanes in the mixing space and the motion of the feed plungers into the cartridges.

2. The device according to claim 1, wherein the mixing vanes are inclined consistently with respect to the axis about which the mixing vanes rotate in the mixing space such that the rotation of the mixing vanes in the mixing space causes the mixing ware to be propelled in the mixing space.

3. The device according to claim 1, wherein the gear is force-locking and/or form-fitting.

4. The device according to claim 1, wherein the gear comprises at least one tooth lock washer, at least one friction disk, at least one cogwheel, at least one worm wheel and/or at least one friction wheel by means of which force and/or torque is transmitted.

5. The device according to claim 1, wherein the gear is a cogwheel gear, a friction wheel gear, a conical wheel gear, a contrate gear, a worm gear or a combination of said gears.

6. The device according to claim 1, wherein the mixing vanes are arranged on a rotary shaft that is mounted such as to be rotatable, whereby the rotary shaft extends out of the mixing space, and the rotary shaft is connected to the gear such that the rotary shaft with the mixing vanes can be rotated in the mixing space by means of a motion of the lever or pin.

7. The device according to claim 6, wherein the clutch is provided in the rotary shaft.

8. The device according to claim 1, wherein the clutch is a sprung rotating clutch provided in the connection from the gear to the mixing vanes.

9. The device according to claim 1, wherein the facility for propelling the feed plungers in the cartridges is a clamp rod having a tiltable jamming opening or a gear rack having a unidirectionally-acting snap-in locking means, whereby the jamming opening or the snap-in locking means is connected to the lever or the jamming opening or the snap-in locking means is connected to the pin.

10. The device according to claim 1, wherein at least one manually-opening valve element or manually-opening closures is/are arranged in the connection between the mixing space and the cartridges or in the connectors for the cartridges.

11. The device according to claim 1, wherein the device comprises a handle for holding the device by one hand, whereby the lever or the pin or an operating element for manual operation of the lever or pin is arranged appropriately in the region of the handle such that the lever or pin or operating element can be operated by the same hand that holds the device by the handle.

12. The device according to claim 1, wherein the mixing space comprises a dispensing opening for application of the mixing ware on a side opposite from the connection to the cartridges.

13. The device according to claim 1, wherein static shearing elements for mixing of the mixing ware are arranged in the mixing space.

14. The device according to claim 1, wherein a circular arc or circular arc section is arranged on the lever and has on its front face or its side surface a driving row of cogs or a friction surface arranged by means of which a cogwheel or friction wheel of the gear can be driven or in that a serration or a friction surface is arranged on the pin by means of which a cogwheel or friction wheel of the gear can be driven.

15. The device according to claim 1, wherein the gear comprises an appropriate transmission ratio such that, upon a full motion of the lever or pin, the mixing vanes perform at least 2 turns in the mixing space.

16. The device according to claim 1, wherein the facility for propelling the feed plungers in the cartridges is appropriately connected to the lever or pin such that, upon a full motion of the lever or pin, the feed plungers are propelled in the cartridges by at least 1 mm.

17. The device according to claim 1, wherein the facility for propelling the feed plungers in the cartridges is appropriately connected to the lever or pin such that the feed plungers expel at least 90% of the starting components from the cartridges upon 5 to 25 full motions of the lever or pin.

18. A method for the mixing of fluid starting components, said method being carried out with the device according to claim 1, said method comprising: tilting the lever or moving the pin of said device in the longitudinal direction; a force produced by tilting the lever or moving the pin propelling the feed plungers in the at least two cartridges and pressing the starting components contained in the cartridges into the mixing space by means of the feed plungers; and the force produced by tilting the lever or moving the pin rotating the mixing vanes in the mixing space, whereby the transmission of the force of the lever or pin for rotating of the mixing vanes is effected by means of the gear wherein the lever or pin, after being moved, is restored to a starting position by a restoring element, whereby the feed plungers are not moved and the mixing vanes are not rotated during said restoration to the starting position.

19. The method according to claim 18, wherein the rotating of the mixing vanes in the mixing space mixes the starting components in the mixing space and conveys them in the direction of a dispensing opening.

20. The method according to claim 18, wherein the gear is driven by means of a sprocket wheel or friction sprocket wheel on the lever or a row of cogs or a friction surface on the pin.

21. The method according to claim 18, wherein the motion of the pin or lever is repeated in order to empty the cartridges by at least 90%.

22. The method according to claim 18, wherein the gear transmits a full stroke of the lever or pin into at least 2 turns of the mixing vanes in the mixing space.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further exemplary embodiments of the invention shall be illustrated in the following on the basis of five schematic figures, though without limiting the scope of the invention. In the figures:

(2) FIG. 1: shows a schematic perspective view of a device according to the invention folded open;

(3) FIG. 2: shows a schematic perspective partial view of a device according to the invention;

(4) FIG. 3: shows a schematic perspective partially sectioned view of a device according to the invention;

(5) FIG. 4: shows another schematic perspective partially sectioned view of a device according to the invention; and

(6) FIG. 5: shows a schematic side view of a part of another device according to the invention.

(7) Identical or similar components are identified in the figures, to some extent, through the same reference numbers even if different cementing guns are concerned.

(8) FIG. 1 shows a schematic perspective view of a device 1 according to the invention that is opened towards the top. The device 1 comprises a lever 2 that can be pulled and is arranged in front of a pistol handle 3. As a result, the device 1 can be held in one hand and the lever 2 can be operated with the same hand that pulls and/or operates the lever 2. The lever 2 is supported like in a bearing with respect to the handle 3 such that it can rotate about an axis, whereby an elastic compression spring (not shown) is arranged between lever 2 and handle 3 such that the compression spring can always return the lever 3 to the starting position shown. The lever 2 comprises three depressions for fingers to be placed in such that it can be comfortably operated by the fingers of the same hand that also holds the handle 3.

(9) Two cylindrical cartridges 4 are arranged side-by-side inside the device 1 and contain the starting components (not shown) that are used to produce the mixing ware. Moreover, feed plungers (not shown in FIG. 1) are arranged on the rear side in the cartridges 4 (on the right in FIG. 1) and can be shifted in longitudinal direction. The feed plungers are connected, on their rear side (on the right in FIG. 1), to two rods 6 or the rods 6 touch against the rear side of the feed plungers. The rods 6 are connected to each other through a yoke 7. The purpose of the rods 6 is to push the feed plungers in the cartridges 4 to the front end of the cartridges 4 (on the left in FIG. 1) without the yoke touching against the rear-side opening of the cartridges 4 and thus preventing a further motion of the rods 6 into the inside of the cartridges 4 and thus a further motion of the feed plungers in the direction of the front side of the cartridges 4 (on the left in FIG. 1).

(10) Moreover, the yoke 7 is connected to a gear rack 8, whereby the cogs of the gear rack 8 comprise a steep flank (in the direction of the front sideon the left in FIG. 1) and a shallow flank (in the direction of the rear sideon the right in FIG. 1). Alternatively, the yoke 7 can just as well be formed by a blade that connects the rods 6 to the gear rack 8 and cut through the walls of the cartridges 4 when the yoke 7 and the feed plungers are being driven towards the front. Said design is advantageous in that the device 1 can be designed more compact, since the rods 6 can then be made significantly shorter, whereby the gear rack 8, in its starting position, then is arranged further in the direction of the front side of the device 1, but it is a disadvantage that a larger mechanical force needs to be exerted in order to have the blades of the yoke cut through the walls of the cartridges 4. Moreover, blades of this type cannot be manufactured from plastics. Therefore, the design shown, having the wide yoke 7, is preferred.

(11) The cogs of the gear rack 8 are engaged by a snap-in locking means 9 that is connected, in mobile manner, to the lever 2 by means of a shaft and that is mounted elastically sprung against the cogs of the gear rack 8. The snap-in locking means 9 engages, by its front edge, the steep flanks of the cogs of the gear rack 8 when the lever 2 is rotated and/or tilted by moving the lever in the direction of the handle 3, since the shaft about which the lever 2 is rotated is situated below the connection to the snap-in locking means 9. Accordingly, the upper part of the lever 2 tilts in the opposite direction from the lower part of the lever 2, by which the lever is being held.

(12) As a result, the gear rack 8 is driven towards the front (to the left in FIG. 1) and, by means of the gear rack 8, the yoke 7 and the rods 6 and thus the feed plungers in the cartridges 4 are driven towards the front such that the starting components are expelled from the cartridges 4 towards the front. When the lever 2 is released or no pressure or insufficient pressure is exerted any longer on the lever 2 by the hand of the user, the spring mechanism of the lever 2 ensures that the snap-in locking means 9 moves in the direction of the rear side of the device 1. Concurrently, the snap-in locking means 9 is tilted against the lever 2 and slips over the shallow flanks of the cogs of the gear rack 8 such that the gear rack 8 is not being moved in the direction of the rear side of the device 1 (on the right in FIG. 1).

(13) Due to said spring mechanism of the snap-in locking means 9, the next pressing or pulling of the lever 2 towards the handle 3 causes the snap-in locking means 9 to engage cogs in the gear rack 8 that are arranged further back (further on the right in FIG. 1). As a result, each stroke of the lever 2 can push the gear rack 8 and thus the rods 6 and the feed plungers a few cogs and/or cog lengths further down in the direction of the front side of the device 1.

(14) The lever 2 is connected, additionally, to a sprocket wheel 10 that is also rotated along when the lever 2 is rotated. Cogs are arranged on a side surface of the sprocket wheel 10 and engage the cogwheels of a gear (not shown in FIG. 1). Said gear drives mixing vanes (not shown in FIG. 1) that can rotate on a rotary shaft (not shown in FIG. 1) in a mixing space 12. The mixing space 12 is connected to the internal space of the cartridges 4 by means of a connection 14 such that, upon propulsion of the feed plungers, the starting components are guided from the cartridges 4 via the connection 14 into the mixing space 12.

(15) The rotation of the mixing vanes mixes the starting components in the mixing space 12 and conveys them in the direction of a dispensing tube 16 on the front side of the device 1 and finally expels them through the dispensing tube 16. Using a free-wheel clutch (not shown in FIG. 1), the mixing vanes can rotate in the mixing space 12 in one direction and/or in one direction of rotation only. Accordingly, the mixing vanes do not rotate along with the motion of the lever 2 towards the starting position that is attained by the compression spring between the lever 2 and the handle 3. The gear having a suitable transmission ratio, the mixing vanes rotate two to five times about the rotary shaft upon a full stroke of the lever 2. Exemplary designs of the gear and device for free-wheeling, and/or of the free-wheel clutch are described in FIGS. 2 to 4, which also explain their mode of working in more detail.

(16) Initially, the cartridges 4 are closed by a valve element 18 that is arranged, such that it can be rotated, as a tube section, in which the part of the mixing space 12 facing the connection 14 is arranged. The valve element 18 comprises two openings (not shown) that can be made to overlap with the openings of the connection 14. For this purpose, the valve element 18 can be rotated by means of a valve lever 20. The valve lever 20 extends through a gap in the wall of the mixing space 12.

(17) The entire assembly is arranged in a housing 21 and is manufactured from plastics. The spring elements and compression springs can just as well be manufactured from metal. An upper part of the housing 21 is shown in FIG. 1 to be folded open towards the top in order to afford a view into the inside of the device 1. The valve lever 20 of the valve element 18 projects through a slit 22 in the housing 21. In operation, the housing 21 is closed and all moving parts are thus covered. In order to get the device 1 and/or the cementing pistol 1 ready, the valve lever 20 is rotated first and thus the cartridges 4 are being opened towards the mixing space 12. Subsequently, the lever 2 is operated (pressed) repeatedly and the starting components of the cement in the cartridges 4 are thus being pressed into the mixing space 12 where they are mixed. Due to the pressure from the cartridges 4 and by means of the propulsion by the mixing vanes in the mixing space 12, the cement mixture is mixed and expelled towards the front through the dispensing tube 16 and can be applied in this location.

(18) FIG. 2 shows a schematic perspective partial view of a device according to the invention. The device 1 is shown without its housing in FIG. 2 and the detail focuses on the essential parts of the drive of the device. The device comprises two cartridges 4 arranged such as to be parallel to each other, of which only one is drawn in FIG. 2. The second cartridge has not been drawn to afford a better view of the gear. The device resembles the one according to FIG. 1, whereby the present design uses, instead of the gear rack, a simple smooth cylindrical clamp rod 28 that is engaged by a tiltable jamming disc 29 having a jamming opening, instead of by the snap-in locking means. Accordingly, the jamming disc 29 comprises a jamming opening arranged in the centre through which extends the clamp rod 28, whereby the internal diameter of the jamming opening is larger than the external diameter of the clamp rod 28 such that the jamming disc 29 can be inclined on the clamp rod 28 and thus the jamming opening can jam with the clamp rod 29. Clamp rods 28 of this type in cementing pistols and cementing skeleton pistols are known.

(19) The jamming disc 29 is connected to a lever 2 such that it can be tilted about an axis and/or rotated, whereby the lever 2 can be rotated manually on the underside (not shown). A spring 30 transfers the jamming disc 29 into a sliding (not jammed) position when the lever 2 is not being operated. When the lever 2 is moved, i.e. when the part of the lever 2 shown in FIG. 2 is moved towards the front (towards the right top in FIG. 2), the jamming disc 29 jams with the clamp rod 28. As a result, the clamp rod 28 is pushed towards the front (towards the right top in FIG. 2).

(20) The clamp rod 28 is connected by means of a yoke (not shown) to two rods 6 of which only one rod 6 is shown in FIG. 2. Accordingly, when the clamp rod 28 is moved towards the front, the rod 6 also moves towards the front and pushes two feed plungers 32 into the cartridges 4, which are arranged in parallel, which causes the content of the cartridges 4 to be pressed towards the front out of the cartridges 4 into a connection 14 and from there into a mixing space 12.

(21) A sprocket wheel 10 is fastened to the lever 2 and rotates when the lever 2 is rotated. A rotary shaft 33 is arranged in the mixing space 12, mounted such that it can rotate, and has mixing vanes (not shown in FIG. 2) arranged on it that can rotate about the rotary shaft 33 in the mixing space 12. The rotary shaft 33 can be driven by the sprocket wheel 10 by means of a gear. The sprocket wheel 10 is engaged by a first small cogwheel 34 of the gear that is connected, by a shaft, to a second larger cogwheel 36 of the gear. The second larger cogwheel 36 finally engages a third small cogwheel 38 that is fastened to the rotary shaft 33. As a result of said transmission, the rotary shaft 33 rotates approximately three times about its own axis upon a full stroke of the lever 2 and thus upon a rotation of the sprocket wheel 10 by approx. 45. The mixing vanes rotate accordingly in the mixing space 12.

(22) A free-wheel clutch and/or a sprung rotating clutch is arranged in the rotary shaft 33 between the third cogwheel 38 and the mixing space 12. The spring mechanism 40 for this purpose can be seen on the rotary shaft 33. The free-wheel clutch and/or the sprung rotating clutch is implemented through two interlocked circular discs 42, 44 engaging each other that are pushed onto each other by the spring mechanism 40. Flanks of the cogs of the circular discs 42, 44 differing in slope depending on the direction of rotation, attain a preferential direction of the rotation of the part of the rotary shaft 33 that extends into the inside of the mixing space 12.

(23) The openings of the connection 14 to the mixing space 12 can be closed and opened by means of a valve element analogous to the one according to FIG. 1. The valve element can be rotated in a slit 22, and thus can be opened and closed, through a valve lever 20. The working mechanism of the device according to FIG. 2 is the same as the working mechanism of the device 1 according to FIG. 1. Upon each stroke of the lever 2, the feed plungers 32 are propelled further into the inside of the cartridges 4. Concurrently, the same motion of the lever 2 rotates the rotary shaft 33 and thus rotates the mixing vanes in the mixing space 12. Due to the rotation of the mixing vanes, the content of the mixing space 12 is being mixed and extruded through an exit opening (not shown in FIG. 2) out of the device.

(24) FIG. 3 shows a schematic perspective and partially sectioned view of the device according to the invention according to FIG. 2, in which the two mutually-engaging, interlocked circular discs 42, 44 of the free-wheel clutch and/or sprung rotary clutch and the mixing vanes 46 can be seen well. Moreover, it can be seen through the section made how the valve element 18 rests in and/or touches against the walls of the mixing space 12. A spring 47 pushes the right (front) circular disc 44 onto the left (rear) circular disc 42. The mixing vanes 46 are arranged inclined on the rotary shaft 33 in the same sense of orientation with respect to the rotary shaft 33 such that a rotation of the rotary shaft 33 propels the mixing ware in the mixing space 12 (towards the right in FIG. 3).

(25) When the upper edge of the (third) cogwheel 38 rotates into the image plane, the friction of the shallow flanks of the circular discs 42, 44 is insufficient for the right circular disc 44 to rotate along with the left circular disc 42. The circular discs 42, 44 slip over each other and the rotary shaft 33 arranged in the mixing space 12 does not rotate along.

(26) When the lower edge of the (third) cogwheel 38 rotates into the image plane, the steep (perpendicular) flanks of the circular discs 42, 44 engage each other such that the right circular disc 44 rotates along with the left circular disc 42. The rotary shaft 33 arranged in the mixing space 12 rotates along with the mixing vanes 46. Accordingly, a repeated motion of the lever 2 and thus of the gear-mediated rotary motion of the rotary shaft 33 in front of the mixing space 12 results just in an unidirectional rotation of the rotary shaft 33 in the mixing space 12 and thus of the mixing vanes 46. Accordingly, the mixing vanes 46 always drive the mixing ware in the mixing space 12 towards the dispensing opening (on the right in FIG. 3).

(27) The valve element 18 comprises a round valve opening 48 in the form of a passage through the wall of the tube-shaped valve element 18. The valve opening 48 rotates along with the valve element 18. When the valve element 18 is rotated into an appropriate position, as shown in FIG. 3, the valve opening 48 overlaps with the access to the connection 14 and/or to the cartridge connector 14. A second valve opening (not shown) then establishes an opening to the connection 14 of the second cartridge (not shown in FIG. 3). As a result, the two cartridges are opened towards the mixing space 12 and the starting components can be conveyed from the cartridges into the mixing space 12.

(28) According to another embodiment of the invention that can be considered to be a variant of the design according to FIG. 3, the invention can provide the third cogwheel 38 and the left circular disc 42 to comprise a cylindrical bushing, and the rotary shaft 33 to extend through these bushings such that the third cogwheel 38 and the left circular disc 42 are arranged on the rotary shaft 33 such that they can be shifted along the symmetry axis of the rotary shaft 33. The rotary shaft 33 is then formed in the direction of the yoke as a spindle having a thread. An internal thread is provided in the yoke in the form of a screw nut by means of which the rods and thus the feed plungers are propelled such that the yoke and thus the rods and the feed plungers are pulled in the direction of the connections 14 of the cartridges to the mixing space 12 by the rotation of the spindle. Moreover, the third cogwheel 38 and the left circular disc 42 are spring-mounted in the direction of the right circular disc 44 by a compression spring between the thread of the spindle and the third cogwheel 38. The third cogwheel 38 and the left circular disc 42 are preferably provided as a single part. For this purpose, the third cogwheel 38 preferably has a larger height than the drive cogwheel (the second cogwheel) engaging the third cogwheel 38 such that the third cogwheel 38 can glide on the drive cogwheel without the full height of the cogwheel no longer being usable any more. For this purpose, it is sufficient if the third cogwheel 38 is higher than the drive cogwheel by the height of the cogs of the circular discs 42, 44. As a result of said design, the rotating rotary shaft 33 of the mixing vanes 46 can also be used as drive spindle for propulsion of the feed plungers.

(29) FIG. 4 shows another schematic perspective and partially sectioned view of a device according to the invention. The design is identical to the one according to FIGS. 2 and 3, whereby a conical cogwheel 39 instead of the usual cogwheels is incorporated such that the direction of rotation can be reversed by the gear. As a result, the cogs of the sprocket wheel (not shown in FIG. 4) can just as well be arranged on the front side of the sprocket wheel. For this purpose, the other cogwheels, in part or all of them, are also provided as conical cogwheels (not shown). Preferably, the sprocket wheel also comprises an inclined surface and thus forms a conical sprocket wheel.

(30) Static shearing elements 49 that do not rotate along with the rotary shaft 33 are arranged in the mixing space 12. The purpose of said shearing elements 49 is to cut the mixing ware, which is being propelled towards the front (to the right top back in FIG. 4) perpendicular to the conveying direction and to thus improve the mixing. A series of five shearing elements not shown in FIG. 4 is arranged with mirror symmetry on the opposite side of the rotary shaft 33 in the mixing space 12. As a result, the rotary shaft 33 is supported as in a bearing in the mixing space 12 by the shearing elements 49, which end in cylindrical shell segments.

(31) The purpose of the spring mechanism 47 is to push the right (front) circular disc 44 onto the left (rear) circular disc 42. When the upper edge of the conical cogwheel 39 rotates in counter-clockwise direction with respect to the rotary shaft 33 (viewed from the backviewed from left bottom front in FIG. 4), the friction of the shallow flanks of the circular discs 42, 44 is insufficient for the right circular disc 44 to move along with the left circular disc 42. Rather, the circular discs 42, 44 slip over each other and the part of the rotary shaft 33 arranged in the mixing space 12 and the mixing vanes 46 do not rotate.

(32) When the conical cogwheel 39 rotates in clockwise direction (viewed from left bottom front in FIG. 4), the steep (perpendicular) flanks of the circular discs 42, 44 engage each other such that the right circular disc 44 rotates along with the left circular disc 42. The rotary shaft 33 arranged in the mixing space 12 rotates along with the mixing vanes 46. Accordingly, the repeated motion of the lever 2 and thus the repeated gear-mediated rotary motion of the rotary shaft 33 in front of the mixing space 12 result(s) just in a unidirectional rotation of the rotary shaft 33, and thus of the mixing vanes 46, in the mixing space 12. Accordingly, the mixing vanes 46 always drive the mixing ware in the mixing space 12 towards the dispensing opening.

(33) FIG. 5 shows a schematic side view of a functionally essential part of a further device according to the invention and/or a cementing gun according to the invention. This device also is shown in the absence of a housing. A part of the device is shown sectioned in the depiction of FIG. 5. Sectioned surfaces are shown hatched in FIG. 5.

(34) The device is operated by means of a spring-mounted pin 52 that is mobile in longitudinal direction, instead of a lever. The spring mechanism is attained by means of a spring 54 that is fastened between a bracket 55 on the housing (not shown) and a bracket 56 on a button 58 or a key 58. When the button 58 is pushed in the direction of the bracket 55, the compression spring 54 is being compressed and takes up energy. Releasing the pressure, the pin 52 is pushed to the front again (to the left in FIG. 5) by the button 58.

(35) In the rear region arranged inside the housing, cogs 60 are arranged on one side on the pin 52 such that the pin 52 forms a gear rack 52 in this region. Said gear rack 52 is arranged to be axially mobile with respect to a cogwheel 62 such that the cogs 60 of the gear rack 52 and/or pin 52 engage the cogs of the cogwheel 62. The cogwheel 62 is connected by means of its shaft to a free-wheel clutch 64 that ends in an outer sprocket wheel. The free-wheel clutch 64 rotates the outer sprocket wheel with the cogwheel 62 only if the cogwheel 62 rotates in clockwise direction with respect to the direction of view of the observer of FIG. 5, i.e. when the pin 52 is pushed towards the back (to the right in FIG. 5). Free-wheel clutches 64 of this type are known, for example, from bicycles, but can be designed very simply for the present purpose, since they do not need to have particularly easy-running idling properties.

(36) The outer sprocket wheel of the free-wheel clutch 64 engages a cogwheel 65 that is arranged on a cogwheel shaft such that it can rotate. A conical cogwheel 66 is arranged on said cogwheel shaft and rotates along with the cogwheel 65. The conical cogwheel 66 is arranged in front of the cogwheel 65, with respect to the viewing plane, in FIG. 5. A second conical cogwheel 67, arranged orthogonally, engages the conical cogwheel 66 and drives a rotary shaft 68, 70. Accordingly, the rotary shafts of the conical cogwheels 66, 67 are perpendicular to each other. The inclination of the cone jacket surface of the conical cogwheels 66, 67 is inclined at an angle of 45 with respect to the rotary shaft thereof.

(37) The second conical cogwheel 67 is arranged on the rear rotary shaft 68. The front rotary shaft 70 is arranged in a mixing space 72 that is bordered by mixing space walls 72 and is shown in cross-section in FIG. 5. For this purpose, the rotary shaft 68, 70 is guided through a seal into the mixing space 72, in which the rotary shaft 68, 70 is supported as in a bearing such that it can rotate. Mixing vanes 74 are arranged on the front rotary shaft 70 and rotate in the mixing space 72 when the rotary shaft 68, 70 rotates. The mixing vanes 74 are inclined appropriately with respect to the plane perpendicular to the rotary shaft 70 such that the mixing vanes 74 drive a mixing ware in the mixing space 72 (to the left in FIG. 5) towards the front, when the rotary shaft 70 is driven by the pin 52 being pressed and/or by a motion of the pin 52 to the right in FIG. 5.

(38) To improve the mixing of the mixing ware, perpendicular shearing elements 76 are arranged in the mixing space 72 and extend as rectangular discs perpendicularly from the mixing space wall 72 in the direction of the rotary shaft 70. The shearing elements 76 cut through the cement paste (the mixing ware) that is being driven in the direction of a front dispensing opening (not shown in FIG. 5).

(39) The pin 52 is connected on its rear side to a lever 78 by means of a rotatable shaft. The lever 78 is supported as in a bearing by a shaft 80 such that it can be rotated and/or tilted with respect to the housing. The lever 78 can be designed in telescoping manner in order to be able to move along on the linear motion of the pin 52. A snap-in locking element 82 is connected to the lever 78 on the opposite side of the lever 78 by means of a shaft such that it can rotate. The snap-in locking element 82 is pressed, by a leaf spring 84, against a rod 86 bearing cogs 88.

(40) The cogs 88 of the rod 86 have a perpendicular flank, which points to the right in FIG. 5, and a shallow flank, which points to the left in FIG. 5. The snap-in locking element 82 engages the perpendicular flanks of the cogs 88 and glides over the shallow flanks of the cogs 88. As a result, upon a motion of the pin 52 in the direction of the rear side of the device (to the right in FIG. 5), the rod 86 is pushed in the direction of the front side of the device (to the left in FIG. 5) by the lever 78 and the snap-in locking element 82.

(41) The rod 86 pushes onto a feed plunger 90 that is arranged in a cartridge 92 that is filled with one of the starting components for the mixing ware and/or with the bone cement, and that is connected to the mixing space 72. The rod 86 can just as well be fastened to the feed plunger 90. A second cartridge (not shown) is situated right before or behind the cartridge 92 shown in cross-section in FIG. 5, and is arranged to be parallel to the first cartridge 92 and has a linearly mobile feed plunger (not shown) arranged in it. The design of the two parallel cartridges 92 is identical in this context. The rod 86 is shaped in the way of a yoke such that the feed plunger of the front (second cartridge) is also driven by the rod 86. The front cartridge also exits into the mixing space 72.

(42) Due to the propulsion of the rod 86 and the feed plungers taking place in separate pushes, the components are conveyed out of the cartridges 92 into the mixing space 72 and are mixed therein by means of the static shearing elements 76 and the rotating mixing vanes 74, and are driven to the front by the rotating mixing vanes 74. Lastly, the ready-mixed mixing ware (the medical cement) is expelled to the front out of the device and applied.

(43) It is preferred according to the invention to have at least one closure (not shown) that can be opened manually or one valve element (not shown) that can be opened manually arranged on the openings or in the openings between the cartridges 92 and the mixing space 72, by means of which the mixing space 72 is separated from the two cartridges 92. The closure and/or the valve element, as the case may be, closes the content of the cartridges 92 off from the outside and renders the device well-suited for storage of the starting components (or of the cartridge contents, as the case may be).

(44) Instead of cogwheels and conical cogwheels, friction wheels and conical friction wheels can be used just as well in all embodiments.

(45) The features of the invention disclosed in the preceding description and in the claims, figures, and exemplary embodiments, can be essential for the implementation of the various embodiments of the invention both alone and in any combination.

LIST OF REFERENCE NUMBERS

(46) 1 Device/cementing gun 2 Lever 3 Handle/pistol handle 4 Cartridge 6 Rod 7 Yoke 8 Gear rack 9 Snap-in locking means 10 Sprocket wheel 12 Mixing space 14 Connection/cartridge connector 16 Dispensing tube 18 Valve element 20 Valve lever 21 Housing 22 Slit 28 Rod 29 Jamming rod 30, 47 Spring 32 Feed plunger 33 Rotary shaft 34, 36, 38 Cogwheel 39 Conical cogwheel 40 Spring mechanism 42, 44 Circular disc 46 Mixing vanes 48 Valve opening 49 Shearing element 52 Pin/gear rack 54 Spring 55, 56 Bracket 58 Button/key 60, 88 Cog 62 Cogwheel 64 Free-wheel clutch 65 Cogwheel 66, 67 Conical cogwheel 68 Rear rotary shaft 70 Front rotary shaft 72 Mixing space wall 74 Mixing vanes 76 Shearing element 78 Lever 80 Shaft 82 Snap-in element 84 Leaf spring 86 Rod 90 Feed plunger 92 Cartridge