HRP960047A2 - Joining element for furniture of thermoplastic nonmetal material of worked out round tubes and tubular joining elements - Google Patents

Description

The technical field to which the invention belongs

The invention belongs to the field of mechanical engineering, especially machine elements, more specifically devices for fastening or securing machine elements, and quite specifically to the field of connecting elements for furniture. According to the International Patent Classification (IPC), inventions of this type are included in class F16B 12/12.

Furthermore, according to the above-mentioned classification, it would be possible to place this type of invention in class F16B 2/20, in which printed detachable connecting elements are classified, the operation of which is ensured based on their resistance to reshaping.

Technical problem

The invention is based on the problem of how to create as simple and inexpensive a connecting element for furniture as possible, which will enable a quick, nevertheless sufficiently safe, but generally certainly also detachable and repeatable interconnection of primarily round pipes made of non-metallic thermoplastic material with appropriate pipe connections also made of non-metallic thermoplastic material , where the foundation, taking into account the specific conditions during the processing of thermoplastic materials, will enable the use of the joint even with more sensitive deviations in the measurements of individual pipes or pipe connections.

State of the art

From SE 9101249 or EP 0510560 Al, a so-called element for connecting two parts is known, generally in the connection plane, which includes a first means for connecting the element with respect to the first part and a second means for connecting the element with respect to the second part. This second part includes a closing member, which when the relative movement of both parts essentially along the connection plane causes a pressed connection of one with the other. This type of solution is undoubtedly quite safe, but unfortunately it is completely inappropriate for connecting a classic round pipe with an angle connection; for that purpose, the tube would have to be specially prepared, and the foundation itself would certainly be too complicated to be able to fulfill the goal set for the invention in question. Furthermore, the otherwise successful operation of this type of device would be conditioned by relatively strict requirements regarding the manufacturing tolerances of individual components, and such requirements cannot significantly help when looking for a simple and cheap solution.

On the other hand, the applicant is familiar with the solution of the manufacturer of cheap constructions for furniture based on paper, actually a combination of some kind of paper rolls and pipe connections made of non-metallic thermoplastic materials. At the same time, the pipe connections are equipped with conical protrusions directed in the appropriate directions, on which it is possible to print relatively deformable pipes made of paper material. Because of the friction between the inner surface of each pipe and the outer surface of the corresponding conical projection, a satisfactory pressed connection of the furniture elements based on this was obtained. Despite its simplicity and satisfactory strength under ideal conditions, the above solution has at least two unavoidable drawbacks that the user encounters during practical use. On the one hand, the pipe connection made of thermoplastic material is problematic, or paper pipes in a sufficiently narrow tolerance range, so in practice it happens that the fit of the pipe on the pipe connection is more or less loose many times, and which is further increased due to the different loads of the furniture during use, which deforms the pipe locally, so the clearance is even more increases. Repeated disassembly and reassembly has a particularly unpleasant effect on the quality of the fit. On the other hand, it happens that the joint fails completely under certain conditions, which usually happens, for example, in rooms that are exposed to moisture, chemical influences or just slightly larger temperature changes.

Description of the solution to the technical problem

The subject of the invention is therefore a joint for furniture made of thermoplastic non-metallic material, made of round tubes and angular connections, in which each round tube is tightly butted on or printed on the corresponding roller or a tubular protrusion of the pipe connection, which provides a printed, but detachable and repeatable connection between the round pipe and the pipe connection. According to the invention, the disposable is a round tube based on a non-metallic thermoplastic material, which is equipped on its inner surface with a plurality of essentially in its longitudinal direction flowing, and essentially comparatively spaced from each other in the profile essentially triangular ribs, adjustable, preferably printable on the associated tubular protrusion of the disposable pipe connections. At the same time, each tubular protrusion is equipped with at least one notch placed in its longitudinal direction. Furthermore, the mentioned ribs on the inner surface of the pipe can be trapezoidal, semicircular or rectangular in profile. Furthermore, it is possible to fit at least one elastic clamp, interrupted in the circumferential direction, from the outside, in the transverse plane and in the radial direction of the pipe, which is each time supported by at least two mutually spaced, essentially radially outwardly protruding extensions . Even further, it is possible to put the end cap in the associated pipe protrusion of the pipe connection with its stem. At the same time, each stem of the said cap is equipped with at least one longitudinally directed rib, with the number of ribs preferably corresponding to the number of longitudinal slots of the associated tubular outlet of each tube.

Furthermore, an alternative version of the joint for furniture is also possible, in which a double-walled pipe can be fitted to the indicated protrusion of the pipe connection.

In the following, the invention will be concretized with an example of performance that will be described in more detail on the basis of the attached sketch, where they show

Fig. 1, according to the invention, a joint for furniture made of thermoplastic non-metallic material made of round pipes and pipe connections, shown in a partial longitudinal section of individual areas, in the plan,

Fig. 2 joint for furniture in section in plane II-II according to si. 1,

Fig. 3, in particular, shows the pipe of the furniture joint in a side view and

Fig. 4, in particular, shows the pipe connection of the furniture connection according to the invention,

Fig. 5 shows an alternative embodiment of a joint for furniture with a double-walled pipe shown in section in substantially the same plane as in Fig. si. 2, but without the clip and

Fig. 6 shows a double-walled pipe of an alternative version according to fig. 5, in side view.

As can be seen on si. 1, the connection according to the invention is basically based on a round pipe 1 made of thermoplastic material and a pipe connection 2, which in the case in question is also preferably made of thermoplastic material, although the latter is not really important for the invention itself.

As can be seen on si. 2, and especially on si. 3, the pipe 1 in the present case is designed as a classic round tube, but which is equipped with ribs 12 on its inner surface 11. The ribs 12 are triangular in the present case, but other versions are also possible. The design with 12 ribs, which are trapezoidal in profile, is also very logical. Furthermore, the ribs 12 in the profile could be semicircular or rectangular or square. It is especially important that the ribs 12 on the inner surface 11 - observed in the circumferential or circular direction of the pipe 1 - are arranged at least essentially evenly spaced from each other and that, furthermore, they flow essentially or at least approximately in the longitudinal direction of the pipe 1, and that is preferably linear, but can also follow a curve, for example as a coil.

Pipe connection 2 (si. 1, 2 and 4) in the case in question is made as a single piece, which in the case in question consists of six equal tubular projections 21, two of which are arranged in the corresponding main spatial coordinate axis. This is only one of the possible cases of pipe connection 2, which in no way represents a limitation of the area of protection of the invention in question. In general, the tubular connection 2 could be made of, for example, only two tubular protrusions 21, each protruding at a certain angle or even parallel to each other.

Each protrusion 21 of the pipe connection 2 is equipped with at least one longitudinally placed groove. In the case in question, each protrusion 21 is equipped with two longitudinal grooves 22 arranged diametrically opposite each other.

Furthermore, in the present case of the connection of pipe 1 and pipe connection 2 to each pipe 1, it is possible to fix the plate 5, which can be, for example, a glass plate, load-bearing plate, decorative plate, and the like, using clamps 3 (si. 1 and 2). At the same time, the disposable clip 3 is made of a suitably elastic, preferably also thermoplastic material, and is based on a ring that is appropriately interrupted in the circumferential direction and, in addition, is equipped with at least two suitably spaced, essentially radially outwardly protruding and essentially parallel extensions. 31, 32. And in this case it should be noted that the sequels 31 or 32 could be more, e.g. three, in the case when two parallel plates 5 would be attached to the pipe 1.

Furthermore, it is on si. 1 shows the end plug 4, which is shown in partial section, and is based on the stem 41 and the head 42, which in the present case is semi-spherical. The stem 41 is equipped with at least one longitudinal rib 43, where it should be noted that the number of ribs 43 preferably corresponds to the number of longitudinal grooves 22 of each outlet 21, in which we fit the plug 4.

When we make the tube 1 from the appropriate thermoplastic material in a suitable way (e.g. by extruding) and cut it to the appropriate length, we can perform the connection according to the invention by fitting the tube 1 to the associated projection 21 of the pipe connection 2. For the load needs that are common with furniture, the connection preferably we ensure already by manual assembly or possibly - as necessary - by pressing, but without significant loads, but, for example, possibly by light blows in the longitudinal direction of the pipe 1. On the one hand, this was achieved by the base of the ribs 12 on the inner surface 11 of the pipe 1, and on the other side by the base of the longitudinal grooves 22 on each projection 21 of the pipe connection 2. Furthermore, when fixing, for example, the plate 5 to the pipe 1, it is possible to first adjust the plate 5 between the corresponding extensions, i.e. the corresponding extensions 31, 32 of the clamp 3, and then without major difficulties, especially with minimal load, push each clamp 3 in the lateral direction of the pipe 1, i.e. in the direction of its diametrical plane i.e. the transverse plane of plate 5,

In doing so, the clamp 3 expands or dissolves so much that we can put it on the tube 1, after which it clamps it. Furthermore, with the connection according to the invention, if necessary, it is possible to equip those projections 21 of the pipe connection 2 on which the pipe 1 is not inserted, i.e. to close or end with an end plug 4, whose respective longitudinal rib 43 on the stem 41 fits into the corresponding groove of each projection 22 21 of the pipe connection 2, which prevents the inadvertent falling out of the plug 4 from the outlet 21 of the pipe connection 2.

The described foundation takes into account the specific features encountered in cases where the component parts of more or less loaded constructions are made of thermoplastic materials. Namely, by using the ribs 12 formed on its inner surface 11, the pipe 1 rests on the associated protrusions 21 of the pipe connection 2 equipped with at least one longitudinal groove 22, a surprisingly simple and effective (secure) elastic connection of the mentioned parts is obtained, which works despite the relatively large dimensional deviations that can hardly be completely avoided in the processing of thermoplastic materials, and at the same time, despite the possible deformations that occur due to the normal loads to which the furniture is subjected, there is sufficient friction between the pipe 1 and the connection 2. Since when establishing the joint according to the invention, it is mostly or as a rule about elastic deformations of the ribs 12 and the protrusions 21, the joint is certainly detachable and repeatable: the same applies to the clamps 3 and plugs 4.

In the case of thermoplastic materials, the processing of which could be feasible by ensuring relatively small dimensional deviations, an alternative version of the joint for furniture (si. 5 and 6) could be considered, in which the pipe Y is made as a double-walled pipe. In this case, the pipe 1' is made of two parallel tubular shells 15, 16, between which relatively thin ribs 17 are arranged, which (as seen in the circumferential or circular direction of the pipe 1') are equally distributed among themselves. Thus, in the alternative version of the furniture joint, the tube 1' of the above-described structure is placed on the associated protrusion 21 of the pipe connection 2. Namely, this kind of foundation would in certain cases enable sufficient elasticity of the joint and thereby ensure sufficient friction between the protrusions 21 and the pipe 1\ and thus the safety of the joint.

Finally, it should be noted that the furniture joint according to the invention is especially distinguished by its resistance to moisture and other unpleasant climatic conditions to which various furniture elements are exposed when they are in an open space (panels, advertising shelves, etc.), and often also when are located in damp rooms (e.g. in basements, garages, and even in less comfortable business or residential areas).

Claims (7)

1. A joint for furniture made of thermoplastic non-metallic material made of round pipes and pipe connections, whereby each round pipe (1, 1') can be closely fitting and pressed onto the associated pipe connection (2), which results in a printed but detachable connection round pipes (1) and pipe connections (2), indicated by the fact that each round pipe (1) is made of a non-metallic thermoplastic material, which is preferably equipped on its inner surface (11) with a plurality of essentially in its longitudinal direction placed mutually be comparatively spaced, essentially triangular ribs (12) in profile, adjustable, preferably pressable on the associated tubular externally cylindrical projection (21) of each pipe connection (2), whereby each tubular projection (21) is equipped with at least one in its longitudinal direction set by the slot (22). 2. The joint for furniture according to claim 1, characterized in that the pipe (1') is based on a double-walled pipe consisting of thin tubular shells (15, 16) arranged parallel to each other, separated from each other in the circumferential direction of the pipe (1 ') evenly spaced ribs (17). 3. The connection of the furniture according to claim 1 and 2 is marked by the fact that the tube (1) is externally, in the transverse plane and in the radial direction of the tube (1), adjustable elastic, in the circumferential direction interrupted clamp (3), based on at least two mutually spaced, essentially radially outwardly projecting extension (31, 32). 4. The furniture connection according to claims 1, 2 and 3 is characterized by the fact that it is possible to insert an end plug (4) with its stem (41) into the associated pipe projection (21) of the pipe connection (2), whereby the stem (41) is equipped with at least with one longitudinally placed rib (43), with the number of ribs (43) preferably corresponding to the number of longitudinal grooves (22) of the associated tubular outlet (21) of each pipe (2). 5. Joint for furniture according to claim 1, characterized in that the ribs (12) on the inner surface (11) of the tube (1) are trapezoidal in profile. 6. Joint for furniture according to claim 1, characterized in that the ribs (12) on the inner surface (11) of the pipe (1) are semicircular in profile. 7. Joint for furniture according to claim 1, characterized in that the ribs (12) on the inner surface (11) of the tube (1) are rectangular in profile.