MASSAGING APPARATUS HAVING TWO ROLLERS AND A SUCTION CHAMBER

Abstract: In a massaging apparatus (1) with two rotatable rollers (30, 31), which are spaced apart transversely to their roller spindles (32, 33), and with a suction chamber (56) disposed in the area of the two rollers (30, 31) and having two transverse walls (57, 58) extending transversely to the roller spindles (32, 33) and two longitudinal walls (59, 60) extending parallel to the roller spindles (32, 33), which suction chamber is connected to a pump (67) via an air-transfer connection (66) for generating a vacuum in the suction chamber (56) so as to form a skin fold (72) which is drawn into the suction chamber (56), at least one longitudinal wall (59, 60) is disposed between the two rollers (30, 31) and the free end (62, 63) of a longitudinal wall (59, 60) disposed between the two rollers (30, 31) extends up to the circumferential surface (37, 38) of the roller (30, 31) adjacent this free end (62, 63) in that area of its circumferential surface which faces the other roller (31, 30).

Description: Massaging apparatus having two rollers and a suction chamber The invention relates to a massaging apparatus comprising two rollers which are each rotatable about one of two mutually parallel spaced-apart roller spindles, which rollers can be placed onto the skin of a person with their circumferential surfaces and are rotationally drivable in a given direction of rotation when the massaging apparatus with its two rollers is moved over the skin of a person in a given operating direction which extends transversely to the roller spindles, and comprising a suction chamber in the area of the two rollers, which suction chamber encloses a suction space and comprises two transverse walls, which extend substantially perpendicularly to the roller spindles, and two longitudinal walls, which extend parallel to the roller spindles, are connected to the two transverse walls, and each have a free end adjacent the circumferential surface of a roller, which suction chamber is open in its area which faces a person's skin when the rollers are applied to the skin of a person and is connected to a pump for the transfer of air via an air- transfer connection, by means of which pump - with the rollers applied to the skin of a person - a partial vacuum can be generated in the suction chamber in order to form a skin fold which is drawn into the suction chamber. Such a massaging apparatus of the type defined in the opening paragraph is known, for example, from the document US 4,729,368 A. In this known massaging apparatus the two rollers are disposed inside the suction chamber, in such a manner that both the two longitudinal walls and the two transverse walls of the suction chamber extend around the rollers. This results in a comparatively large contact area with which the suction chamber is in contact with a person's skin during operation of the massaging apparatus. Owing to this comparatively large contact area of the .known apparatus it is comparatively difficult to achieve a proper sealing between the skin of a person and the suction chamber. Moreover, as a result of the comparatively large contact area comparatively large frictional forces occur between the skin of a person and the longitudinal walls and transverse walls of the suction chamber. Furthermore, owing to the comparatively large contact area the partial vacuum generated in the suction chamber gives rise to a comparatively high surface pressure between the skin of a person and the portions of the two longitudinal walls and the two transverse walls of the suction chamber which cooperate with the skin, as a result of which comparatively large forces are required to move the massaging apparatus over the skin of a person. Owing to the fact that the rollers are disposed inside the suction chamber and the longitudinal walls and the transverse walls of the suction chamber consequently extend around the rollers, the suction chamber has a comparatively large volume, as a result of which the evacuation of air from the suction chamber by means of a pump having a given pump capacity takes a comparatively long time in order to reach a certain desired vacuum and the massaging apparatus also becomes comparatively bulky, while it is further necessary that the roller spindles extend through the transverse walls, which gives rise to undesired leaks and, as a consequence, air leakage problems at the suction chamber. In order to mitigate a further air leakage problem at the suction chamber the known massaging apparatus further comprises two sealing flaps which are pivotally mounted at the location of a cover wall of the suction chamber, which also enclose the two rollers and during operation of this massaging apparatus engage with the circumferential surface poπions of the two rollers which are remote from one another, in order to obtain a sealing inside the suction chamber. However, since the degree of soiling of the rollers increases as the operating time increases, skin particles and other contaminants settling on the circumferential surfaces of the two rollers, causing an undesirable clearance between the sealing flaps and the circumferential surfaces of the two rollers, these two sealing flaps do not provide a proper sealing. Finally, another problem of the known massaging apparatus is that in operation of the massaging apparatus a person's skin may be caught or get pinched between the roller which is simated at the rear in the given operating direction and the adjacent longitudinal wall of the suction chamber. It is an object of the invention to preclude the above-mentioned problems and to provide am improved and simplified massaging apparams of the type defined in the opening paragraph. To achieve this object, in accordance with the invention, a massaging apparams of the type defined in the opening paragraph is characterized in that at least one longitudinal wall of the suction chamber is disposed substantially between the two rollers, and the free end of a longitudinal wall disposed between the two rollers extends up to the circumferential surface of the roller adjacent this free end in that area of its circumferential surface which faces the other roller. In this way, it is achieved that the contact area of the suction chamber with the skin can be comparatively small, so that it is relatively simple to achieve a proper sealing between the skin of a person and the suction chamber, i.e. the two longimdinal walls and the two transverse walls of this suction chamber. The comparatively small contact area of the suction chamber with the skin has the advantage that comparatively small frictional forces occur between the walls of the suction chamber and a person's skin and the surface pressure between the walls of the suction chamber and a person's skin is comparatively low, as a result of which the massaging apparatus can be moved over a person's skin with comparatively small forces. A further advantage is that the suction chamber can have a comparatively small volume, as a result of which the evacuation of air from the suction chamber by means of a pump having a given pump capacity takes a comparatively short time in order to reach a certain desired vacuum and such a massaging apparams can be of comparatively compact and simple construction. Moreover, it is thus possible to realize a massaging apparams in accordance with the invention in which the suction chamber does not give rise to any air leakage problems at all or only to minor air leakage problems. In a massaging apparams in accordance with the invention at least that longitudinal side wall of the suction chamber, whose free end extends up to the circumferential surface of the roller which is simated at the front in the given operating direction, can be interposed between the two rollers. However, in a massaging apparams in accordance with the invention it has proved to be advantageous if at least that longitudinal wall of the suction chamber, whose free end extends up to the circumferential surface of the rearward roller, viewed in the given operating direction, is disposed substantially between the two rollers. In this way, it is achieved that, at least at the location of the roller simated at the rear in the given operating direction, there is no risk of pinching between this rearward roller and that longitudinal wall of the suction chamber, which extends up to this roller. In a massaging apparams in accordance with the invention as mentioned in the preceding paragraph it has proved to be very advantageous if a dirt scraper is disposed adjacent that area of the circumferential surface of the rearward roller, viewed in the given operating direction, which is remote from forward roller, viewed in the given operating direction, which scraper is urged onto the circumferential surface of the rearward roller, viewed in the given operating direction, by means of at least one spring. Thus, it is achieved by simple means that no ingress of din into the massaging apparams is possible at the location of the rearward roller in the given operating direction, and that a person's skin cannot get caught or pinched at the location of the roller simated at the rear in the given operating direction, because this is precluded by the dirt scraper which is urged onto the circumferential surface of this roller. In all the massaging apparatuses defined hereinbefore it has proved to be particularly advantageous if the two longitudinal walls of the suction chamber are disposed substantially between the two rollers. In this way, a very small contact area of the suction chamber with a person's skin is obtained, as a result of which a very good sealing between a person's skin and the walls of the suction chamber is obtained and very small frictional forces and a very low surface pressure occur between the walls of the suction chamber and a person's skin. Moreover, this enables a very small volume of the suction chamber and a very compact construction of a massaging apparams to be obtained. Another very important advantage of such a massaging apparams in accordance with the invention is that the suction chamber itself is absolutely sealed because the two transverse walls have no passages for leading through or for supporting the roller spindles, so that there are absolutely no air leakage problems caused by the bearing means of the rollers and a particularly rapid build-up of a vacuum in the perfectly sealed suction chamber is possible. In a massaging apparams of the type defined in the preceding paragraph it has proved to be particularly advantageous, in addition, the two transverse walls of the suction chamber are also disposed substantially between the two rollers. This is advantageous for a particularly small contact area of the suction chamber with a person's skin, and for a particularly compact construction of the suction chamber. In a massaging apparams of the type defined in the preceding paragraph it has proved to be particularly advantageous if the two longimdinal walls and the two transverse walls of the suction chamber form a dome-like suction space of substantially ellipsoidal shape without any corners inside the suction chamber. This is advantageous for a particularly gentle cooperation of the suction chamber with a skin portion drawn into the suction chamber and for a desired comparatively high mechanical stiffness of the suction chamber. In massaging apparatuses in accordance with the invention in which both longimdinal walls of the suction chamber are disposed between the two rollers, it has further proved to be very advantageous if bearing walls, which extend transversely to the roller spindles and which project laterally from the suction chamber, are fixedly connected to the suction chamber disposed between the two rollers, and the two rollers are rotatably supported by means of the bearing walls. This has the advantage that by means of the suppoπing walls the two rollers are rotatably supported in a fixed relationship with respect to the suction chamber, i.e. with respect to the two longimdinal walls and the two transverse walls of the suction chamber, which is advantageous in view of a constant relative position of a roller with respect to its adjacent longimdinal wall and, consequently, in view of a constant air gap between a roller and its adjacent longimdinal wall. In a massaging apparams of the type defined in the preceding paragraph it has proved to be very advantageous if the suction chamber forms pan of a suction chamber suppon, the bearing walls form pans of a bearing device, and the suction chamber suppoπ is fixedly connected to the bearing device. This is favorable for an advantageous construction of the apparams. In all the massaging apparatuses defined hereinbefore it has proved to be very advantageous if of the two rollers at least the forward roller, viewed in the given operating direction, has a circumferential surface with a surface roughness in a range between 0 μm and 2 μm. By giving the circumferential surface of at least the forward roller viewed in the given operating direction such a surface roughness, which roller is constructed as a mirror-finish smooth roller of a comparatively hard material, a panicularly good adhesion of a roller on a person's skin and, hence, a good cooperation of a roller with a person's skin are achieved. It is to be noted that the two rollers can have a circumferential surface with a surface roughness ranging between 0 μm and 2 μm, but that the rearward roller, viewed in the given operating direction, can also have a higher surface roughness and can be made of a comparatively soft material. In all the massaging apparamses defined hereinbefore it has further proved to be very advantageous if the two longimdinal walls and the two transverse walls of the suction chamber have a surface roughness in a range between 4 μm and 8 μm at the location of their bounding surfaces which can be brought into contact with the skin of a person. For a minimal adhesion of the suction chamber walls to a person ' s skin and, consequently, a minimal friction between the suction chamber walls and a person's skin it has proved to be very favorable if there is such a surface roughness at the location of those bounding surfaces of the two longimdinal walls and the two transverse walls of the suction chamber which can be brought into contact with a person's skin. In all the massaging apparamses defined hereinbefore it has further proved to be very advantageous if at least for the greater part the free end of each of the two longimdinal walls recedes towards the apparams interior with respect to a tangential plane common to the two rollers in their areas which face the skin of a person - with the rollers applied to the skin of a person. This is advantageous in view of a minimal friction of the longimdinal walls of the suction chamber on a person's skin and in view of comparatively large contact areas of the two rollers on a person's skin. In all the massaging apparamses defined hereinbefore it has further proved to be very advantageous if the free end of each of the two longimdinal walls extends up to the circumferential surface of a roller so as to form an air gap having a gap width of at the most 0.2 mm. Thus, it is has become substantially impossible that a person's skin gets pinched between a roller and a longimdinal wall of the suction chamber. In a massaging apparams of the type defined in the preceding paragraph it has also proved to be very advantageous if the free end of at least one longimdinal wall of the two longimdinal walls of the suction chamber is urged against the circumferential surface of the roller adjacent this free end under pre-load. This ensures that the free end of a longimdinal wall of the suction chamber always closely engages with the circumferential surface of the roller adjacent this free end, so that it is virtually impossible for a person's skin to get trapped between a roller and a longimdinal wall of the suction chamber. In all the massaging apparamses defined hereinbefore it has further proved to be very advantageous if a roller which, viewed in the given operating direction, is followed by a longimdinal wall of the suction chamber has circumferential grooves, and the longimdinal wall following this roller has tooth-like wall extensions which each engage in a groove in this roller. This is advantageous in order to ensure that a person's skin is kept away effectively from the area of the gap between a roller and the longimdinal suction- chamber wall adjoining this roller. The afore-mentioned as well as further aspects of the invention will be apparent from the exemplary embodiments described hereinafter and will be elucidated by means of these exemplary embodiments. The invention will now be described in more detail with reference to the drawings, which show five exemplary embodiments to which the invention is not limited. Figure 1 is an oblique underneath view showing a massaging apparams in accordance with a first embodiment of the invention, which comprises two rotationally drivable rollers and suction chamber having two longimdinal walls and two transverse walls, both the two longimdinal walls and the two transverse walls of the suction chamber being essentially disposed between the two rollers. Figure 2 shows a variant of the massaging apparams of Figure 1 in a sectional view taken substantially across the center of the massaging apparams, Figure 2 diagrammatically showing, in particular, the drive means for driving the two rotationally drivable rollers. Figure 3 shows a variant of the massaging apparams of Figure 1 in a sectional view also taken substantially across the center of the massaging apparams but inverted with respect to the sectional view of Figure 2, Figure 3 showing, in particular, the means for generating and influencing the partial vacuum in the suction chamber of the massaging apparams. Figure 4 is an oblique underneath view of a suction chamber support for the suction chamber of the massaging apparams as shown in Figures 1 and 3. Figure 5 is an oblique plan view of the suction chamber support shown in Figure 4 for the massaging apparams as shown in Figures 1 and 3. Figure 6 is an oblique plan view of a bearing device included in the massaging apparams in accordance with Figures 1 and 3, which bearing device serves for supporting the drive means for the rollers and for supporting the rollers themselves. Figure 7 shows a roller of a massaging apparams in accordance with a second embodiment of the invention. Figure 8 shows a roller of a massaging apparams in accordance with a third embodiment of the invention. Figure 9 is a highly diagrammatic sectional view of a massaging apparams in accordance with a fourth embodiment of the invention. Figure 10, similarly to Figure 9, shows a highly diagrammatic sectional view of a massaging apparams in accordance with a fifth embodiment of the invention. A massaging apparams 1 embodying the invention will be described hereinafter with reference to Figures 1 to 6. The massaging apparams 1 comprises a housing 2 having a grip portion 3, which at its free end changes into an end portion 4 of substantially ellipsoidal shape, which can be gripped by the fingers of a hand. At the location of its two side faces the end portion 4 has a push-button 5 and 6, respectively. Each of the two push-buttons 5 and 6 serves for opening an air valve of a vacuum-elimination valve device 7, which is shown in Figure 3. The vacuum-elimination valve device 7 will be described in more detail hereinafter. A rotary knob 10, which is rotatable about an axis 9, projects from a part 8 of the housing 2. The rotary knob 10 can be set from an off-position into an on-position and can then be set continuously from the on-position to various settings. When the rotary knob 10 is set from its off-position to its on-position a pump or pump motor of the massaging apparams 1 is switched on and, in addition, a power supply circuit for the roller drive motor is activated. The roller drive motor is, in fact, not started until a given vacuum is reached in a suction chamber of the massaging apparams 1 , which is detected by means of an electropneumatic vacuum switch, which rns on the roller drive motor when the given desired vacuum in the suction chamber is detected. By turning the rotary knob 10 from its on-position into one of its different settings a controllable vacuum control valve is set to different vacuum values, so that it is possible to obtain different partial vacuums on the suction chamber of the massaging apparams 1 by means of the controllable vacuum control valve. The massaging apparams 1 further comprises a suction chamber support 11, which is shown separately in Figures 4 and 5. The suction chamber support 11 is fixedly connected to a bearing device 12 of the massaging apparams 1. The bearing device 12 is shown separately in Figure 6. To connect the suction chamber support 11 to the bearing device 12 the suction chamber support 11 comprises four lugs 13, 14, 15 and 16, which each have a bore 17, 18, 19 and 20, respectively, near their respective free ends. To connect the suction chamber support 11 to the bearing device 12 the bearing device 12 comprises four mounting sleeves 21, 22, 23 and 24. After the suction chamber support 11 and the bearing device 12 have been assembled during assembly of the massaging apparams 1 two hollow cylindrical sleeves 25 and 26, shown in Figure 3, which sleeves are made of a rubber-like material and serve as damping means, are passed through the bores 17, 18 and the mounting sleeves 21 , 22 as well as the bores 19, 20 and the mounting sleeves 23, 24, after which a bolt 27, 28 is passed through each hollow cylindrical sleeve 25, 26 and a nut, not shown, is fitted onto each bolt 27, 28 to secure the suction chamber support 11 and the bearing device 12 to one another. It is to be noted that the bearing device 12 is secured in the housing 2 in a manner not described, thereby also securing the suction chamber support 11 to the housing 2. For carrying out a massage the massaging apparams 1 is movable over a part of a person's body, i.e. over the skin covering a part of a person's body, in a given operating direction indicated by an arrow 29 in Figures 1 to 6. The massaging apparams 1 further comprises two rollers 30 and 31. Each of the two rollers 30 and 32 is rotatable about one of two spaced-apart mutually parallel roller spindles 32 and 33. For rotatably supporting the two rollers 30 and 31 the bearing device 12 has two bearing walls, of which only a bearing wall 34 is visible in Figure 6. The bearing wall 34 has two bearing bores 35 and 36, in which the roller spindles 32 and 33 are rotatably supported. With their circumferential surfaces 37 and 38 the two rollers 30 and 31 can be placed onto a person's skin 39, shown diagrammatically as a dotted line in Figure 3. During the movement of the massaging apparams 1 and its two rollers 30 and 31 over a person's skin 39 in the operating direction 29, which extends transversely to the roller spindles 32 and 33, the two rollers 30 and 31 can each be driven in a given direction of rotation. In the massaging apparams 1 the two rollers 30 and 31 are each driven in the same direction of rotation, as indicated by means of two arrows 40 and 41 in Figures 2 and 3. It may be considered to rotate the two rollers 30 and 31 , after they have been applied to a person's skin 39, by means of the friction produced between the two rollers 30, 31 and the skin 39 as the massaging apparams 1 and its two rollers 30 and 31 are moved over the skin 39. However, in the massaging apparams 1 the two rollers 30 and 31 are motor-driven. For this purpose, as is shown highly diagrammatically for a variant of the massaging apparams 1 in Figure 2, the massaging apparams 1 comprises a roller drive motor 42, which is secured to the bearing device 12. The roller drive motor has a nominal speed of approximately 8000 r.p.m. The roller drive motor 42 drives a first gear wheel 44 via its motor shaft 43, which gear wheel is in mesh with a second gear wheel 45. The second gear wheel 45 is rotatably supported on the bearing device 12 by means of a spindle 46. The second gear wheel 45 is coaxial with and rotationally locked to a third gear wheel 47. The third gear wheel 47 is in mesh with a fourth gear wheel 48, which is rotatably supported on the bearing device 12 by means of a spindle 49. The fourth gear wheel 48 is coaxial with and rotationally locked to a fifth gear wheel 50, which meshes with a sixth gear wheel 51 which is coaxial with and has the same diameter as the second gear wheel 45. The sixth gear wheel 51 is also rotatably supported on the bearing device 12 by means of the spindle 46. The sixth gear wheel 51 is coaxial with and rotationally locked to a seventh gear wheel 52. The seventh gear wheel 52 is in mesh with an eighth gear wheel 53, which is rotatably supported on the bearing device 12 by means of a spindle which is not shown in Figure 2. The eighth gear wheel 53 is in mesh with a ninth gear wheel 54, which is coaxial with and which is rotationally locked to the roller 30, and with a tenth gear wheel 55, which is coaxial with and which is rotationally locked to the roller 31. By means of the gear wheel mechanism described above the two rollers 30 and 31 can be rotated in the given directions of rotation 40 and 41 by means of the roller drive motor 42, both rollers being drivable with a speed of approximately 50 r.p.m. Referring to Figure 3, it is to be noted with respect to the two rollers 30 and 31 that in the massaging apparams 1 the forward roller 30, viewed in the given operating direction 29, is wholly made of a comparatively hard material, the circumferential surface 37 of the roller 30 advantageously having a surface roughness ranging between 0 μm and 2 μm. The interior of the rearward roller 31, viewed in the operating direction 29, is also made of a comparatively hard material but is surrounded by a shell of a comparatively soft material, the circumferential surface 38 of the rearward roller 31 having a higher surface roughness than the circumferential surface 37 of the forward roller 30. The surface roughness of the circumferential surface 38 of the rearward roller 31 may range approximately between 3 μm and 6 μm. The massaging apparams 1 further has a suction chamber 56 in the area of the two rollers 30 and 31, which chamber bounds a suction space. The suction chamber 56 has two transverse walls 57 and 58, which extend substantially perpendicularly to the roller spindles 32 and 33, two longimdinal walls 59 and 60, which extend parallel to the roller spindles 32 and 33 and which are connected to the two transverse walls 57 and 58, and a cover wall 61 , which is connected both to the two transverse walls 57 and 58 and to the two longimdinal walls 59 and 60. The suction chamber 56 is open in its area which faces a person's skin 39 when the rollers 30 and 31 are applied to the skin 39 of a person. Each of the two longimdinal walls 59 and 60 has a free end 62, 63 adjacent the circumferential surface 37, 38 of a roller 30, 31 , which free end - viewed in the direction of the roller spindles 32 and 33 - has a shape which is substantially straight only in its center portion and which extends parallel to the two roller spindles 32 and 33 but which is curved in its two end portions. The suction chamber 56 - as is apparent particularly from Figure 5 - has two juxtaposed connection tubes 64 and 65. By means of the first connection tube 64 the suction chamber 56 is connected to a pump 67 via a first air-transfer line 66, shown in Figure 3, for the transfer of air, which pump is disposed in the massaging apparatus 1 and is secured to the bearing device 12. The pump 67 comprises a pump motor 68 to drive an air- pumping device of the pump 67. In the present case, the first air-transfer line 66 between the first connection mbe 64 and the pump 67 comprises a first hose section 69 fitted onto the first connection mbe 64, a first T-piece 70, which is connected to the first hose section 69, and a second hose section 71 , which is connected to the first T-piece 70 and to a pump connection, not shown in Figure 3. When the rollers 30 and 31 are applied to the skin 39 of a person the pump 67 can generate a partial vacuum in the suction chamber 56 in order to draw a skin fold 72 into the suction chamber 56, shown diagrammatically as a dotted line in Figure 3. In the massaging apparams 1 the afore-mentioned vacuum-elimination valve device 7 is connected to the first T-piece 70 via a third hose section 73. The vacuum- elimination valve device 7 comprises two air valves, of which an air valve 74 is shown in Figure 3. The air valve 74 can be opened by actuation of the push-button 6. When the air valve 74, or the second air valve which can be opened by actuation of the push-button 5 and which is not visible in Figure 3, is open the partial vacuum previously formed in the suction chamber 56 by means of the pump 67 is eliminated via the third hose section 73. the first T- piece 70, the first hose section 69 and the connection pipe 64. This is advantageous in view of an easy and painless withdrawal of the suction chamber 56 , i.e. of the massaging apparams 1, from the skin 39 of a person. In the massaging apparams 1 a second air-transfer line 75 is connected to the second connection mbe 65 of the suction chamber 56. The second air-transfer line 75 comprises a fourth hose section 76 fitted onto the second connection mbe 65 of the suction chamber 56, a second T-piece 77, which is connected to the fourth hose section 76, and a fifth hose section 78, which is connected to the second T-piece 77 and to a vacuum control valve 79, by means of which a desired vacuum in the suction chamber 56 can be selected by suitably turning the rotary knob 10. As long as a vacuum, which can be generated in the suction chamber 56 of the massaging apparams 1 by the pumping action of the pump 67, is not yet reached the vacuum control valve 79 is in its closed condition. However, when a desired vacuum in the suction chamber 56 is exceeded the vacuum control valve 79 opens automatically, allowing leakage air to flow into the suction chamber 56 via the air-transfer line 75 until the desired partial vacuum is established in the suction chamber 56. In the massaging apparams 1 an electropneumatic vacuum switch 81 is connected to the second T-piece 77 via a sixth hose section 80. For a given value of the vacuum the vacuum switch 81 performs an electrical switching function. The vacuum switch 81 performs an electrical switching function, for example, at a given vacuum having a value of approximately 80 millibar. In the massaging apparatus 1 the vacuum switch 81 forms part of a motor supply device, not shown, for the roller drive motor 42, the vacuum switch 81 enabling the roller drive motor 42 to be rned on when a given vacuum in the suction chamber 56 is reached. This has the advantage that, after the massaging apparams 1 and its two rollers 30 and 31 have been applied to the skin 39 of a person, the two rollers 30 and 31 are not driven until a given vacuum in the suction chamber 56 has been reached and, consequently, a skin fold 72 has been formed. As is apparent from Figures 1 to 3, the two longimdinal walls 59 and 60 of the suction chamber 56 in the massaging apparams 1 are now interposed between the two rollers 30 and 31. Moreover, the two transverse walls 57 and 58 of the suction chamber are also disposed substantially between the two rollers 30 and 31. As is further apparent from Figures 1 to 3, each free end 62 or 63 of a longimdinal wall 59 or 60 interposed between the two rollers 30 and 31 then extends up to the respective circumferential surface 37 or 38 of the roller 30 or 31 adjacent this free end 62 or 63 in its circumferential surface area which faces the other roller 31 or 30. In the present massaging apparams 1 the respective free end 62 or 63 of each of the two longimdinal walls 59 and 60 extends up to the respective circumferential surface 37 or 38 of a roller 30 or 31 so as to form an air gap, not shown, having a gap width of approximately 0.1 mm. The gap width of the air gap between the free ends 62 and 63 of the longimdinal walls 59 and 60 and the circumferential surfaces 37 and 38 of the two rollers 30 and 31 can alternatively have a smaller value of, for example, 0.05 mm but also a larger value of, for example, 0.15 mm to 0.2 mm. As is apparent from Figures 1 to 5 and, particularly, from Figures 1 , 4 and 5, the greater part of the free end 62, 63 of each of the two longimdinal walls 59 and 60 recedes towards the apparams interior from a tangential plane indicated by a dash-dot line 82 in Figure 2, which plane is common to the two rollers 30 and 31 in their areas which face the skin 39 of a person when the rollers 30 and 31 are applied to the skin 39 of a person. This is very advantageous in view of a low friction of the longimdinal walls 59 and 60 of the suction chamber 59 on the skin 39 of a person and in view of maximal contact areas of the two rollers 30 and 31 on the skin 39 of a person. As is also apparent from Figures 1 to 4, the two longitudinal walls 59 and 60, the two transverse walls 57 and 58, and the cover wall 61 of the suction chamber 56 bound a dome-like suction space of substantially ellipsoidal shape without any corners inside the suction chamber 56, which is favorable for a comfortable and careful massage of a skin fold 72. It is to be noted that in the massaging apparams 1 the two longitudinal walls 59 and 60 and the two transverse walls 57 and 58 of the suction chamber 56 have a surface roughness of approximately 6 μ at the location of their bounding surfaces which can be brought into contact with the skin 39 of a person. However, these bounding surfaces can alternatively have a surface roughness of 4 μm, 5 μm, 7 μm or 8 μm. Such a surface roughness has proved to be advantageous for a low adhesion of the walls 57, 58, 59 and 60 of the suction chamber 56 to the skin 39 of a person and, consequently, for a minimal friction between the walls 57, 58, 59 and 60 of the suction chamber 56 to the skin 39 of a person. With respect to the suction chamber 56 it is to be noted that in the area of the cover wall 61 of the suction chamber 56 a filter 83 is arranged in a passage leading to the two connection pipes 64 and 65, as can be seen in Figures 2 and 3. Referring to Figure 5, it is to be noted with respect to the suction chamber 56 and the suction chamber support 11 that in the interior of the apparams the suction chamber 56 has three mounting sleeves 84, 85 and 86 which are integral with the suction chamber 56 and into which the fixing bolts passed through the bearing device 12 can be screwed, thus providing an additional fixed connection between the suction chamber support 11 and the bearing device 12. The massaging apparams 1 , as can be seen in Figure 3 , comprises a dirt scraper 87 adjacent that area of the circumferential surface of the rearward roller 31 in the given operating direction 29, which is remote from forward roller 30 in the given operating direction 29, which scraper is urged onto the circumferential surface 38 of the rearward roller 31 in the given operating direction 29 by means of a spring 88 in the form of a leg spring. This dirt scraper 87 ensures that in the area of the rearward roller 31 in the given operating direction 29 no ingress of dirt into the massaging apparams 1 is possible and that the skin 39 of a person cannot get trapped in the area of the rearward roller 31 in the given operating direction 29 because this is precluded by the dirt scraper 87, which is urged onto the circumferential surface 38 of the roller 31. Owing to the fact that in the massaging apparams described above both the two longimdinal walls and the two transverse walls of the suction chamber are arranged between the two rollers it is simply achieved that the contact area of the suction chamber on the skin is particularly small, as a result of which it is simple to achieve a proper sealing between a person's skin and the suction chamber, i.e. the two longitudinal walls and the two transverse walls of this chamber. The particularly small contact area of the suction chamber, i.e. its walls, with a person's skin has the advantage that only small frictional forces occur between the walls of the suction chamber and a person's skin and only a low surface pressure occurs between the walls of the suction chamber and a person's skin, as a result of which the massaging apparams can be moved over a person's skin with small forces. A further advantage of the massaging apparams described above is that the suction chamber can have a very small volume, as a result of which the evacuation of air from the suction chamber by means of a pump of given pump capacity incorporated in the massaging apparams can be effected in a comparatively short time in order to reach a certain desired vacuum. Owing to the small volume of the suction chamber the massaging apparams can be comparatively compact at least at the location of the suction chamber. Moreover, a special advantage of the massaging apparams described above is that the suction chamber itself is absolutely sealed so that there are absolutely no air leakage problems at the location of the suction chamber walls and, as a consequence, a particularly rapid build-up of a vacuum in the perfectly sealed suction chamber is possible Furthermore, it is to be noted that owing to the dome-like rounded shape of the suction chamber in its interior a particularly gentle cooperation of the suction chamber with the skm fold which has been drawn into suction chamber is guaranteed and an advantageously high mechanical stiffness of the suction chamber is achieved The rotatable mounting of the two rollers of the massaging apparams in the bearing walls of the bearing device which is fixedly connected to the suction chamber and the suction chamber support has the advantage that by means of the bearing walls of the bearing device the two rollers are rotatably supported in a fixed relationship with the suction chamber, 1 e the walls of the suction chamber, which is advantageous in view of a constant relative position of the rollers with respect to their adjacent longimdinal walls and, consequently, in view of a constant air gap between each roller and its adjacent longimdinal wall The selected surface roughnesses of the circumferential surfaces of the two rollers in the massaging apparams described above ensures a particularly favorable cooperation of the rollers with a person's skin In view of a minimal friction between the longimdinal walls of the suction chamber and a person's skin it has also proved to be favorable that the longimdinal walls with their free ends for the greater part recede into the interior of the apparams Fig 7 shows only a detail of a massaging apparatus in accordance with a second embodiment of the invention This detail concerns the forward roller 30, viewed in the given operating direction 29 of the massaging apparams 1 , which roller is rotationally drivable about the roller spindle 32 in the direction indicated by the arrow 40 The longimdinal wall 59 of the suction chamber 56, which is shown only partly, is disposed behind the roller 30, viewed in the given operating direction 29 In the massaging apparams 1 shown in Figure 7 the roller 30 has circumferential grooves 89 Furthermore, in this massaging apparatus 1 the longimdinal wall 59, which follows the roller 30 viewed in the given operating direction 29, has tooth-like wall extensions 90, each wall extension 90 engaging in a groove 89 of the roller 30 In the present case, the wall extensions 90 are formed as comparatively short projections of the longimdinal wall 59 Figure 8, in the same way as Figure 7, shows a detail of a massaging apparams in accordance with a third embodiment of the invention This Figure also shows the forward roller 30, viewed in the given operating direction 29, and the longimdinal wall 59 of the suction chamber 56 of this massaging apparams 1 , which wall is disposed adjacent this roller 30 The roller 30 of this massaging apparams 1 also has grooves 89, in which the wall extensions 90 of the longimdinal wall 59 engage. In the present case, the wall extensions 90 are formed by comparatively long arcuate projections of the longimdinal wall 59, the arcuate shape of these projections having a radius substantially equal to the radius of the roller 30 Figure 9 is a highly diagrammatically view showing a massaging apparams in accordance with a fourth embodiment of the invention In this massaging apparams only one longimdinal wall of the suction chamber 56 is interposed between the two rollers 30 and 31 , which are rotationally drivable in the directions indicated by the arrows 40 and 41 in accordance with the given operating direction 29 The roller spindle 32 of the forward roller 30 in the given operating direction 29 is rotatably supported in the two transverse walls of the suction chamber 56 in the massaging apparams 1 shown in Figure 9 Of the transverse walls of the suction chamber 56 only a transverse wall 91 is shown m Figure 9 The roller spindle 33 of the rearward roller 31 in the given operating direction 29 is rotatably supported in two transverse wall portions of the housing 2 in the massaging apparams 1 shown in Figure 9 Of these two transverse wall portions of the housing 2 only a transverse wall portion 92 is shown in Figure 9 In the massaging apparams 1 shown m Figure 9 the suction chamber 56 also forms part of a suction chamber support 11 In the present case the suction chamber support 11 is directly secured to the housing 2 by means of diagrammatically shown screwthread connections As already stated, only one longimdinal wall of the suction chamber 56 is interposed between the two rollers 30 and 31 in the massaging apparams 1 shown in Figure 9 This is the longimdinal wall 95 of the suction chamber 56, whose free end 96 extends up to the circumferential surface 38 of the rearward roller 31 in the given operating direction 29 The second longimdinal wall 97 of the suction chamber 56, whose free end 98 extends up to the circumferential surface 37 of the forward roller 30 in the given operating direction 29, precedes the roller 30, viewed in the given operating direction 29, and is consequently not disposed between the two rollers 30 and 31 In spite of this, the massaging apparams 1 shown in Figure 9 also has a comparatively small contact area for the suction chamber 56 on the skm 39 of a person and the suction chamber 56 has a comparatively small volume Figure 10, in the same way as Figure 9, shows a massaging apparams 1 in accordance with a fifth embodiment of the invention. In comparison with the massaging apparams as shown in Figure 9, the massaging apparams shown Figure 10 is of a substantially mirror- inverted construction, as is apparent from Figure 10 In the massaging apparams 1 as shown in Figure 10 the roller spindle 32 of the forward roller 30 in the given operating direction 29 is rotatably supported in two transverse wall portions of the housing 2 Of these two transverse wall portions of the housing 2 only a transverse wall portion 99 is shown m Figure 10 The roller spindle 33 of the rearward roller 31 in the given operating direction 29 is rotatably supported in the two transverse walls of the suction chamber 56 Of the two transverse walls of the suction chamber 56 only a transverse wall 100 is shown in Figure 10 In the massaging apparams 1 shown in Figure 10 only one longitudinal wall of the suction chamber 56 is disposed between the two rollers 30, I e the longitudinal wall 101 of the suction chamber 56, whose free end 102 extends up to the circumferential surface 37 of the forward roller 30 in the given operating direction 29 The second longimdinal wall 103 of the suction chamber 56, which is partly covered by a longimdinal wall portion 104 of the housing 2 and whose free end 105 extends up to the circumferential surface 38 of the roller 31 m the given operating direction 29, follows the roller 31, viewed in the given operating direction 29, and is consequently not disposed between the two rollers 30 and 31 In the massaging apparatus 1 shown in Figure 10 the construction of the suction chamber 56 is such that of the two longimdinal walls 101 and 103 of the suction chamber 56 the respective free ends 102 and 105 of both longimdinal walls 101 and 103 are urged under pre-load against the circumferential surfaces 37 and 38 of the rollers 30 and 31 adjacent the respective free ends 102 and 105 This pre-load is obtained by an appropriate design of the longimdinal walls 101 and 103, which has been chosen in such a manner that during assembly of the massaging apparams 1 shown in Figure 10 the two longitudinal walls 101 and 102 are loaded by the rollers 30 and 31 at the location of their free ends 102 and 105, which gives rise to the pre-load in the two longimdinal walls 101 and 103 It is to be noted that a pre-load to keep the free end of a longimdinal wall urged against the circumferential surface of the roller adjacent this free end need not necessarily be obtained by the design of the relevant longimdinal wall but can also be achieved by the provision of a separate spring, such as a blade spring, which can be integrated at least partly in a longimdinal wall The massaging apparams 1 shown in Figure 10 also has the advantages of a comparatively small contact area of the walls of the suction chamber 56 on the skm 39 of a person and a comparatively small volume of the suction chamber 56 The invention is not limited to the embodiments described above. The measures in accordance with the invention can also be applied advantageously to massaging apparamses of different constructions. In this respect it is to be noted, for example, that in a massaging apparams comprising two rollers which are rotationally drivable by means of a roller drive motor it is alternatively possible to provide independent drive transmissions which are at least partly independent from one another between the roller drive motor and each of the two rollers, and to drive the forward roller, viewed in the given operating direction of a massaging apparams, with a higher speed than the rearward roller, viewed in the given operating direction of a massaging apparams, as a result of which it is achieved that the forward roller, which is driven with a higher speed, tends to feed more skin or tissue into the suction cone than is moved out of the suction chamber by the rearward roller, which is driven more slowly, thereby assisting the two rollers in the formation of a skin fold which is drawn into the suction chamber of such a massaging apparams. In a massaging apparams in accordance with the invention it is also possible that only one of the two rollers is motor- driven, which driven roller can be the forward roller in the given operating direction but alternatively and sometimes even preferably this can be the rearward roller in the given operating direction. As already stated, a motor drive for the two rollers can be dispensed completely in a massaging apparams in accordance with the invention and the rollers can be driven by the mere friction between a person's skin and the rollers, but in this may lead to an irregular drive of the two rollers and even to a brief standstill of a roller.

Claims: Claims: 1. A massaging apparams comprising two rollers which are each rotatable about one of two mutually parallel spaced-apart roller spindles, which rollers can be placed onto the skin of a person with their circumferential surfaces and are rotationally drivable in a given direction of rotation when the massaging apparams with its two rollers is moved over the skin of a person in a given operating direction which extends transversely to the roller spindles, and comprising a suction chamber in the area of the two rollers, which suction chamber encloses a suction space and comprises two transverse walls, which extend substantially perpendicularly to the roller spindles, and two longimdinal walls, which extend parallel to the roller spindles, are connected to the two transverse walls, and each have a free end adjacent the circumferential surface of a roller, which suction chamber is open in its area which faces a person's skin when the rollers are applied to the skin of a person and is connected to a pump for the transfer of air via an air-transfer connection, by means of which pump - with the rollers applied to the skin of a person - a partial vacuum can be generated in the suction chamber in order to form a skin fold which is drawn into the suction chamber, characterized in that at least one longimdinal wall of the suction chamber is disposed substantially between the two rollers, and the free end of a longimdinal wall disposed between the two rollers extends up to the circumferential surface of the roller adjacent this free end in that area of its circumferential surface which faces the other roller. 2. A massaging apparams as claimed in Claim 1 , characterized in that at least that longimdinal wall of the suction chamber, whose free end extends up to the circumferential surface of the rearward roller, viewed in the given operating direction, is disposed substantially between the two rollers. 3. A massaging apparams as claimed in Claim 2, characterized in that a dirt scraper is disposed adjacent that area of the circumferential surface of the rearward roller, viewed in the given operating direction, which is remote from forward roller, viewed in the given operating direction, which scraper is urged onto the circumferential surface of the rearward roller, viewed in the given operating direction, by means of at least one spring. 4. A massaging apparams as claimed in any one of the Claims 1 to 3, characterized in that the two longimdinal walls of the suction chamber are disposed substantially between the two rollers. 5. A massaging apparams as claimed in Claim 4, characterized in that, in addition, the two transverse walls of the suction chamber are also disposed substantially between the two rollers. 6. A massaging apparams as claimed in Claim 5, characterized in that the two longimdinal walls and the two transverse walls of the suction chamber form a dome-like suction space of substantially ellipsoidal shape without any corners inside the suction chamber. 7. A massaging apparams as claimed in any one of the Claims 4 to 6, characterized in that bearing walls, which extend transversely to the roller spindles and which project laterally from the suction chamber, are fixedly connected to the suction chamber disposed between the two rollers, and the two rollers are rotatably supported by means of the bearing walls. 8. A massaging apparams as claimed in Claim 7, characterized in that the suction chamber forms part of a suction chamber support, the bearing walls form parts of a bearing device, and the suction chamber support is fixedly connected to the bearing device. 9. A massaging apparams as claimed in any one of the Claims 1 to 8, characterized in that of the two rollers at least the forward roller, viewed in the given operating direction, has a circumferential surface with a surface roughness in a range between 0 μm and 2 μm. 10. A massaging apparams as claimed in any one of the Claims 1 to 9, characterized in that the two longimdinal walls and the two transverse walls of the suction chamber have a surface roughness in a range between 4 μm and 8 μm at the location of their bounding surfaces which can be brought into contact with the skin of a person. 11. A massaging apparams as claimed in any one of the Claims 1 to 10, characterized in that at least for the greater part the free end of each of the two longimdinal walls recedes towards the apparams interior with respect to a tangential plane common to the two rollers in their areas which face the skin of a person - with the rollers applied to the skin of a person. 12. A massaging apparams as claimed in any one of the Claims 1 to 11 , characterized in that the free end of each of the two longimdinal walls extends up to the circumferential surface of a roller so as to form an air gap having a gap width of at the most 0.2 mm. 13. A massaging apparams as claimed in Claim 12, characterized in that the free end of at least one longimdinal wall of the two longimdinal walls of the suction chamber is urged against the circumferential surface of the roller adjacent this free end under preload. 14. A massaging apparams as claimed in any one of the Claims 1 to 13, characterized in that a roller which, viewed in the given operating direction, is followed by a longimdinal wall of the suction chamber has circumferential grooves, and the longimdinal wall following this roller has tooth-like wall extensions which each engage in a groove in this roller.

Inventors: BLEEKER JEAN BART, DRENT GERT JAN, OBERMANN WOLFGANG, BLEEKER, JEAN, BART, DRENT, GERT, JAN, OBERMANN, WOLFGANG
Applicants: PHILIPS ELECTRONICS NV, PHILIPS NORDEN AB, PHILIPS ELECTRONICS N.V.
Application year: 1997
Main classification: A61H15
IPC codes: A61H7, A61H9, A61H15