CN211244440U - Anti-shaking machine frame and massager - Google Patents

Abstract

The utility model relates to a prevent frame that rocks, include: a first support bracket and a second support bracket; the first bearing bracket is fixedly connected with a first toothed guide rail, and the second bearing bracket is fixedly connected with a second toothed guide rail; the second support bracket can rotate back and forth relative to the first support bracket so as to adjust the posture of the user by changing the included angle between the second support bracket and the first support bracket; one side wall of the first support bracket and the second support bracket in the left-right direction is provided with a tabling part, and the other side wall of the first support bracket and the second support bracket in the left-right direction is provided with a tabling groove; when the second support bracket rotates relative to the first support bracket, the embedding part slides in the embedding groove correspondingly. Compare in prior art, the frame of this application can avoid massage core to produce when moving about to the switching position of two support brackets and rock. The application further provides a massage machine.

Description

Anti-shaking machine frame and massager

Technical Field

The utility model relates to a massage equipment technique specifically relates to a prevent frame and massager that rocks.

Background

Patent application CN201710363253.9 discloses a massage chair, which can ensure that the massage machine core can move from the head to the thigh by adjusting the bent and straight deformed suspension section along with the angle of the backrest frame and the seat frame. Combine the figure of this patent application, the lateral part of the switching position of back rail roof beam and cushion rail roof beam both hangs the side, and the massage core is when passing through this handing-over position, and the lateral part of massage core can not obtain spacing support, rocks about producing easily, in view of this, provides this application specially.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a prevent the frame of rocking is provided in order to solve among the prior art massage core and produce the problem of rocking about easily when passing through back rail roof beam and cushion rail roof beam.

In order to solve the technical problem, the utility model provides a prevent frame that rocks, include: a first support bracket and a second support bracket; the first bearing bracket is fixedly connected with a first toothed guide rail, and the second bearing bracket is fixedly connected with a second toothed guide rail; the second support bracket can rotate back and forth relative to the first support bracket so as to adjust the posture of the user by changing the included angle between the second support bracket and the first support bracket; one side wall of the first support bracket and the second support bracket in the left-right direction is provided with a tabling part, and the other side wall of the first support bracket and the second support bracket in the left-right direction is provided with a tabling groove; when the second support bracket rotates relative to the first support bracket, the embedding part slides in the embedding groove correspondingly.

Preferably, the frame comprises a bottom frame, and the first support bracket is fixed on or hinged to the bottom frame.

Preferably, the first support bracket is hinged to the base frame; the first supporting bracket is a seat frame, the second supporting bracket is a back frame, a first driving mechanism for driving the first supporting bracket to rotate relative to the seat frame is arranged between the seat frame and the first supporting bracket, and a second driving mechanism for driving the second supporting bracket to rotate relative to the first supporting bracket is arranged between the first supporting bracket and the second supporting bracket.

Preferably, a limiting mechanism is arranged on the first supporting bracket and/or the second supporting bracket, and the limiting mechanism is used for pressing the guide wheel of the massage movement when the guide wheel passes through a gap at the upper side of the switching position of the first supporting bracket and the second supporting bracket; the limiting mechanism comprises a limiting part, the limiting part is provided with a U-shaped limiting part, and the U-shaped limiting part is located in a gap at the upper side of the switching position of the first support bracket and the second support bracket.

The present application further provides a massage machine, comprising: a frame and a massage machine core; the machine frame comprises a first support bracket and a second support bracket, the massage machine core is provided with a walking gear and a guide wheel, and the side part of the guide wheel is attached to the side wall of the first support bracket or the side wall of the second support bracket when the massage machine core walks; the frame is any one of the frames.

By adopting the technical scheme, the utility model discloses can gain following technological effect: when the second support bracket of the application rotates relative to the first support bracket, the embedding part correspondingly slides in the embedding groove, so that the lateral part of the guide wheel of the massage machine core can be always attached to the embedding part when the guide wheel of the massage machine core passes through the switching positions of the two support brackets, and compared with the design mode of CN201710363253.9 in the prior art, the massage machine core can be prevented from shaking left and right when moving to the switching positions.

Drawings

Fig. 1 shows a schematic view of a massager of an embodiment;

fig. 2 shows a first exploded view of the massage machine of an embodiment;

FIG. 3 shows an enlarged view of area A of FIG. 2;

fig. 4 is a second exploded view of the massager of one embodiment;

fig. 5 is a state change diagram of the massage machine according to the embodiment;

fig. 6 is a schematic view of the massager with the walking gear of the massage movement moving to the switching position of the first toothed rail and the second toothed rail;

FIG. 7 is a schematic view of the rail retention mechanism separated from the first and second support brackets;

FIG. 8 is a schematic view of the second support bracket rotating relative to the first support bracket;

FIG. 9 is a schematic view of the second toothed rail rotating relative to the first toothed rail;

FIG. 10 depicts a schematic view of the mating of a first tooth member and a second tooth member;

fig. 11 shows a schematic view of a massager of the second embodiment;

figure 12 shows a schematic view of the running gear and guide wheel of the massage movement moving to the transfer position of the first and second support brackets of the second embodiment;

fig. 13 is a view showing a state change of the second support bracket of the frame of the massage machine of the second embodiment relative to the first support bracket;

FIGS. 14 and 15 are schematic views showing the first support bracket, the second support bracket, and the rail retention mechanism of the third embodiment, respectively, from different perspectives;

FIG. 16 depicts an exploded view of the first support bracket, the second support bracket, the rail retaining mechanism of the third embodiment;

FIG. 17 is a schematic view of the first support bracket, the second support bracket, the rail retention mechanism and the chassis coupled together in accordance with a third embodiment;

FIG. 18 is a schematic view of the first support bracket, the second support bracket, the rail retention mechanism of the third embodiment in cooperation with another chassis;

FIG. 19 is a schematic illustration showing the first support bracket, the second support bracket, and the rail retention mechanism of the fourth embodiment in combination;

fig. 20 to 22 are schematic views of different massage machines, respectively.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

With reference to fig. 1, in a first embodiment, the massage machine is a massage chair, which includes: a frame and a massage machine core 4. The frame includes: an underframe 1, a first support bracket 2 as a seat frame, a second support bracket 3 as a back frame, two first toothed guide rails 5, two second toothed guide rails 6, a first drive mechanism 7, a second drive mechanism 8 and two guide rail holding mechanisms 9.

With reference to fig. 1, the chassis 1 comprises: a ground contacting support part supported on the ground and two side support parts arranged on the left and right sides of the ground contacting support part. The side supporting portions of both sides of the base frame 1 are provided with hinge seats 1A.

With reference to fig. 1, 3 and 4, the first support bracket 2 comprises: two seat guide rail configuration parts which are respectively arranged at the left side and the right side, and a front connecting part which is connected with the front sides of the two seat guide rails. The two-seat rail arrangement portion of the first support bracket 2 has a hinge shaft 2A extending outward in the left-right direction. The hinge shaft 2A is hinged on the hinge seat 1A. In the present embodiment, referring to fig. 3, the outer periphery of the hinge shaft 2A has: an oppositely disposed arcuate face and an oppositely disposed flat face (i.e., two opposing D-shaped structures). Articulated seat 1A has the circular hinge hole with arcwall face looks adaptation, and then first support bracket 2 rotates and articulates on chassis 1 (can rotate 1 relative chassis) through articulated shaft 2A relative articulated seat 1A. Referring to fig. 7, the first support bracket 2 has a fixing member 2D, the hinge shaft 2A passes through the fixing member 2D, the first tooth member 9A and the circular hinge hole outwardly in the axial direction thereof, and the fixing member 2D is fixed to the seat rail arrangement portion to which the fixing member 2D is fixed by welding.

With reference to fig. 1, 3 and 4, the second support bracket 3 comprises: two back guide rail configuration parts which are respectively arranged at the left side and the right side, and a rear connecting part which is connected with the rear sides of the guide rails of the two seat parts. The rear sides of the two back guide rail configuration parts are connected with connecting lug parts used for being connected with the second driving mechanism 8. The second support bracket 3 is connected to the hinge shaft 2A at left and right sides thereof by a rail holding mechanism 9, respectively, as will be described in detail later. Referring to fig. 5, the second support bracket 3 is connected to the first support bracket 2 in an adapter manner, such that the second support bracket 3 can rotate relative to the first support bracket 2 to adjust the posture of the user by changing the included angle therebetween.

Referring to fig. 1, the left and right sides of the massage movement 4 are respectively provided with: a running gear 4A and two guide wheels 4B. The walking gear 4A is located the walking axle of massage core 4 downside, and a set of leading wheel 4B is located the walking axle of massage core 4 upside, and a set of leading wheel 4B is located the walking axle of massage core 4 downside, and the leading wheel that is located the walking axle of downside is located the walking gear 4A outside. The massage machine core 4 can be a common massage machine core with the functions of kneading, knocking and the like, or other massage machine cores.

Referring to fig. 1, 3 and 4, the seat rail arrangement portions on both sides of the first support bracket 2 are fixedly connected with first toothed rails 5, and the back rail arrangement portions on both sides of the second support bracket 3 are fixedly connected with second toothed rails 6. The first toothed guide rails 5 on both sides and the second toothed guide rails 6 on both sides are correspondingly connected, and with reference to fig. 8, in this embodiment, the first toothed guide rail 5 has a first connecting portion 5A, the second toothed guide rail 6 has a second connecting portion 6A, and the first connecting portion 5A and the second connecting portion 6A located on the same side are adjacently disposed in the left-right direction of the rack. It is to be understood that the specific manner in which the first toothed rail 5 and the second toothed rail 6 on the same side are connected is not limited thereto, and the connecting portions between the two are, for example, a structure in which the connecting portions are engaged and have a "convex" shape and a structure in which the connecting portions have a "concave" shape.

Referring to fig. 1, 3, 4 and 5, a first driving mechanism 7 is connected between the base frame 1 and the first support bracket 2 to drive the first support bracket 2 to rotate relative to the base frame 1. The second drive mechanism 8 is coupled between the first support bracket 2 and the second support bracket 3 to drive the second support bracket 3 to rotate relative to the first support bracket 2. The first driving mechanism 7 and the second driving mechanism 8 are telescopic push rods.

With reference to fig. 2, 3, 4, 5, 7, the rail retaining mechanism 9 is located at the transfer position of the first support bracket 2 and the second support bracket 3, wherein fig. 7 omits parts of the assembly. With reference to fig. 8 and 9, the guide rail holding mechanism 9 is used to keep the second support bracket 3 in a always abutting state when rotating relative to the first support bracket 2, so that the walking gear 4A of the massage machine core 4 can switch between the first toothed guide rail 5 and the second toothed guide rail 6.

The rail holding mechanism 9 includes: a first toothed member 9A, a second toothed member 9B, a connecting piece 9C, a first wear part 9D, a second wear part 9E, a washer 9F and a fastening screw 9G. The first tooth member 9A and the second tooth member 9B are engaged with each other. The second toothed member 9B is of a U-shaped configuration, is connected to the second support bracket 3, and follows the rotation of the second support bracket 3. The first toothed member 9A is located within the second toothed member 9B of the U-shaped configuration, the first toothed member 9A being connected to the first support bracket 2 and following rotation of the first support bracket 2. In this embodiment, the first tooth-shaped member 9A is sleeved on the outer periphery of the hinge shaft 2A (i.e., the rotation axis L of the first tooth-shaped member 9A also extends in the left-right direction), and has a fitting surface corresponding to the arc-shaped surface and the plane of the outer periphery of the hinge shaft 2A, so that the first tooth-shaped member 9A itself does not rotate relative to the hinge shaft 2A but can rotate therewith, and the first tooth-shaped member 9A can be separated from the hinge shaft 2A in a manner of moving in the left-right direction relative to the hinge shaft 2A. The connecting piece 9C is connected to the second tooth-shaped member 9B and cooperates therewith to hold the first tooth-shaped member 9A, and the connecting piece 9C serves to restrict relative movement of the first tooth-shaped member 9A and the second tooth-shaped member 9B in the radial direction so that the tooth-shaped members are kept in mesh. First wearing parts 9D and second wearing parts 9E are cake-shaped respectively, rotationally cup joint respectively on articulated shaft 2A, and divide along the axial and locate first profile of tooth component 9A's both sides. The gasket 9F is sleeved on the hinge shaft 2A and is axially positioned outside the hinge seat 1A. The fastening screw 9G is sleeved on the hinge shaft 2A and is located outside the gasket 9F along the axial direction. In this way, the connection of the base frame 1, the first support bracket 2 and the second support bracket 3 is completed.

With reference to fig. 3, 9 and 10, the first and second tooth members 9A and 9B are held in mesh with each other and restricted from moving in the direction of the rotational axis L and in the radial direction by the above-described coupling means. Referring to fig. 9 and 10, in the left-right direction (the direction of the rotation axis L), the first toothed member 9A has a tooth groove facing the teeth of the first toothed rail 5 and the second toothed rail 6, and the second toothed member 9B has a tooth facing the teeth of the second toothed rail 6, and the "facing" arrangement is such that the tooth profiles of the first toothed member 9A and the second toothed member 9B correspond to the toothed rails, thereby ensuring that the traveling gear 4A can smoothly pass through the connecting position of the two toothed rails after the two toothed members rotate relative to each other. In the view of fig. 9, due to the above-mentioned facing relationship, the first toothed member 9A and the first and second toothed rails 5 and 6 are in the "virtual engagement" state, which satisfies that the traveling gear 4A and the first and second toothed rails 5 and 6 are in the "true engagement" state when the traveling gear 4A travels to the position where the first and second toothed rails 5 and 6 are joined. In the present embodiment, the first tooth member 9A and the second tooth member 9B have therebetween: a rotation permitting tooth K1 for permitting relative rotation of the two and two rotation locking teeth K2 for restricting relative rotation of the two. Two rotation locking tooth portions K2 are provided circumferentially on both sides of the rotation allowing tooth portion K1. Referring to fig. 6, 8 and 9, when the second support bracket 3 rotates relative to the first support bracket 2 within a predetermined range of amplitude, the first toothed rail 5 and the second toothed rail 6 are still connected to allow the traveling gear 4B to pass through. In the view of fig. 10, when the first toothed member 9A does not rotate with the first support bracket 2, and the second toothed member 9B rotates clockwise or counterclockwise with the second support bracket 3, the extent to which it can rotate is limited by the rotation locking tooth portion K2. In other embodiments, the extent of relative rotation of the two tooth members can be limited by the addition of a pin and an arcuate slot for the pin to slide.

Referring to fig. 1, in the first embodiment, the first support bracket 2 has a fitting portion 2C located on a side, and the second support bracket 3 has a fitting groove 3A located on a side. When the second support bracket 3 rotates relative to the first support bracket 2, the fitting portion 2C slides in the fitting groove 3A. When the massage machine core normally moves, the side part of the guide wheel 4B at the side part is clung to the side wall 2B of the first support bracket 2 or the side wall 3B of the second support bracket 3, and when the guide wheel 4B of the massage machine core moves to the switching position of the first support bracket 2 and the second support bracket 3, the side part of the guide wheel 4B still can be clung to the embedding part 2C, so that the side part is prevented from being lost to be leaned on and generating left-right shaking when the guide wheel 4B moves to the switching position. It should be understood that the positions of the fitting portion and the fitting groove may be reversed.

Referring to fig. 11 to 13, in the second embodiment, the first support bracket 2 and the second support bracket 3 are provided with the limiting mechanism 10, and the limiting mechanism 10 is used for pressing the guide wheel 4B of the massage movement when the guide wheel 4B passes through the gap at the upper side of the switching position of the first support bracket 2 and the second support bracket 3. The limiting mechanism 10 includes a limiting member 10A, the limiting member 10A has a U-shaped limiting portion for applying pressure to the guide wheel 4B, the limiting member 10A is mounted on the first support bracket 2 and the second support bracket 3 through the mounting portion 10B, and a notch of the U-shaped limiting portion faces upward. As shown in fig. 13, the U-shaped position-limiting part of the position-limiting part 10A is located in the gap above the switching position of the first support bracket 2 and the second support bracket 3, the position-limiting part 10A presses the guide wheel 4B of the massage machine core when the guide wheel 4B passes through the gap, so as to prevent the guide wheel 4B from shaking up and down, and the position-limiting part 10A can deform under the action of the first support bracket 2 and the second support bracket 3 when the first support bracket 2 and the second support bracket 3 are rotated relatively abnormally and are too close to each other, so as to buffer the acting force when the first support bracket 2 and the second support bracket 3 are abnormally close to each other. As shown in fig. 13, in the case where the first support bracket 2 and the second support bracket 3 are provided with the stopper mechanisms, the U-shaped stoppers of the stopper mechanisms are disposed adjacent to each other in the left-right direction, and when the second support bracket 3 rotates relative to the first support bracket 2 to expand the gap between the upper sides of the first support bracket and the second support bracket, the U-shaped stoppers are engaged with each other to ensure that the guide wheel 4B can be continuously pressed. The guide wheel 4B can pass through the switching position of the two support brackets relatively stably by the matching of the embedding groove 3A and the embedding part 2C and the limit of the limiting piece 10A. Other features not mentioned in this embodiment may be the same as those in the previous embodiment, and are not described again.

The connection of the rail holding mechanism 9 to the first and second support brackets 2, 3 is not limited to the above-described embodiment, and in another embodiment, with reference to fig. 14 to 16, the side portion of the first support bracket may have a sleeve shaft with a square outer peripheral cross-section, the first toothed member 9A may be fixed to the sleeve shaft by interference fit or screw fastening, and the second toothed member 9B is connected to the second support bracket 3 and engaged with the connecting member 9C to hold the two toothed members in mesh. It will be readily appreciated that other alternative designs for the rail retention mechanism 9 are possible and will not be described in detail.

Referring to fig. 17, the structure of fig. 16 can also be applied to a massage chair structure, and the application manner can be different from that of fig. 1, as shown in fig. 17, the first support bracket 2 is also a seat frame, the second support bracket 3 is also a back frame, and the first support bracket 2 is fixedly connected to the bottom frame 1. Fig. 17 omits a driving structure for driving the second support bracket 3 to rotate, and fig. 17 shows only a partial structure of the frame.

With reference to fig. 18, the structure of fig. 16 can also be applied to a Spa massage chair structure, where the Spa massage chair includes a base and a frame as shown in fig. 16, the front side of the base has a cleaning tank, the rear side has a movable space S1 for the movement of a massage movement (not shown in fig. 18), the first support bracket 2 is fixed on the base, and the movable space S1 corresponds to the position of the first support bracket 2. The massage machine core can move from the second support bracket 3 to the moving space so as to massage the buttocks and the thighs of the user when the user sits on the Spa for massage.

Referring to fig. 19, in another embodiment, first toothed member 9A is a U-shaped structure that is attached to first support bracket 2, second toothed member 9B is located within first toothed member 9A of the U-shaped structure, and connecting member 9C is attached to first toothed member 9A. In the embodiment of fig. 19, the second toothed member 9B has a tooth groove provided to face the teeth of the first and second toothed rails (not shown in fig. 19) in the left-right direction, and the first toothed member 9A has a tooth portion facing the tooth of the first toothed rail. In the first embodiment, the second supporting bracket 3 supports the user and rotates, the force bearing surface of the connecting member 9C is easily worn by the force mainly applied by the connecting member 9C, and in the embodiment of fig. 19, the force bearing surface of the connecting member 9C is not easily worn by the force mainly applied by the second toothed member 9B.

Based on the above description, the basic principle of the technical idea of the present application is that: when the second support bracket rotates relative to the first support bracket, the first tooth-shaped guide rail and the second tooth-shaped guide rail correspondingly rotate relatively; the positions before and after the first toothed guide rail and the second toothed guide rail rotate relatively need to meet the requirement that the walking gear 4B can be meshed with the two toothed guide rails when moving to the connecting position of the first toothed guide rail and the second toothed guide rail; in order to ensure the above-mentioned condition, the first toothed member or the second toothed member is provided in the left-right direction so as to have a tooth space facing the tooth portions of the first toothed rail and the second toothed rail, and the "toothed member having the tooth space" is regarded as a "traveling gear which moves to the switching position of both the toothed rails" is translated in the left-right direction, and on this basis, as long as "both the toothed members are kept engaged and rotated relatively in synchronization when both the support brackets are rotated relatively", the switching position of the traveling gear 4B passing through both the toothed rails is ensured. Based on the above description of the principle, it is easily understood that the manner of fitting the two tooth members in the present invention is not limited to the above embodiment.

The design of this application frame can also be applied to on other massage machines, and the support bracket can be adjusted according to the product needs correspondence, as shown in fig. 20, in a massage armchair, the massage armchair contains: underframe M1, seat frame M2, back frame M3 and head frame M4. The back frame M3 is rotatable relative to the seat frame M2 with a first rail retaining mechanism N1 therebetween. The head frame M4 is rotatable relative to the back frame M3 with a second rail retaining mechanism N2 therebetween. Unlike fig. 20, in conjunction with fig. 21, only the head frame M4 can be rotated relative to the back frame M3. It should be understood that the chassis is not an essential component of the frame of the massage machine, and in conjunction with fig. 22, in one embodiment, the frame of the massage machine comprises: the seat frame M2 and the back frame M3, which are connected by a first rail holding mechanism N1, the massager of fig. 22 resembles a conventional squab massager that allows the relative positions of the two support brackets to be adjusted according to the angle of the support surfaces. The massage movement structure is omitted in the illustrations of fig. 20 to 22.

It should be noted that, the design scheme of the fitting groove, the fitting portion, and the limiting mechanism in the present application does not need to be used in cooperation with the guide rail holding mechanism, and both may also be applied to the scheme of patent application CN201710363253.9, and are not described again.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. An anti-sway stand comprising: a first support bracket (2) and a second support bracket (3); a first tooth-shaped guide rail (5) is fixedly connected to the first supporting bracket (2), and a second tooth-shaped guide rail (6) is fixedly connected to the second supporting bracket (3); the second support bracket (3) can rotate back and forth relative to the first support bracket (2) so as to adjust the posture of a user by changing the included angle between the two; characterized in that one side wall of the first support bracket (2) and the second support bracket (3) in the left-right direction is provided with a jogged part (2C), and the other side wall in the left-right direction is provided with a jogged groove (3A); when the second support bracket (3) rotates relative to the first support bracket (2), the embedded part (2C) slides in the embedded groove (3A) correspondingly.

2. Anti-sway stand according to claim 1, characterized in that it comprises a base frame (1), said first support bracket (2) being fixed or hinged to the base frame (1).

3. Anti-sway stand according to claim 2, characterized in that the first support bracket (2) is hinged on the base frame (1); the first supporting bracket (2) is a seat frame, the second supporting bracket is a back frame, a first driving mechanism (7) for driving the first supporting bracket (2) to rotate relative to the bottom frame (1) is arranged between the bottom frame (1) and the first supporting bracket (2), and a second driving mechanism (8) for driving the second supporting bracket (3) to rotate relative to the first supporting bracket (2) is arranged between the first supporting bracket (2) and the second supporting bracket (3).

4. The anti-shaking frame according to claim 1, wherein a limiting mechanism (10) is arranged on the first supporting bracket (2) and/or the second supporting bracket (3), and the limiting mechanism (10) is used for pressing the guide wheel (4B) of the massage movement when the guide wheel (4B) passes through a gap at the upper side of the switching position of the first supporting bracket (2) and the second supporting bracket (3); the limiting mechanism (10) comprises a limiting piece (10A), the limiting piece (10A) is provided with a U-shaped limiting part for applying pressure to the guide wheel (4B), and the U-shaped limiting part is located in a gap at the upper side of the switching position of the first support bracket (2) and the second support bracket (3).

5. A massager comprises a rack and a massage machine core, wherein the rack comprises a first support bracket (2) and a second support bracket (3), the massage machine core is provided with a walking gear (4A) and a guide wheel (4B), and the side part of the guide wheel (4B) is attached to the side wall of the first support bracket (2) or the side wall of the second support bracket (3) when the massage machine core walks; characterised in that the frame is as claimed in any one of claims 1 to 4.

Images