Patent Application
20090127826
Currently, some frames for pushchairs and prams are provided with a grip device which lies between the two ends of the handle tubes that are arranged upwardly during use, connecting them to each other.
These kinds of grip device allow, in some circumstances, more convenient use, since they can be gripped for example with just one hand.
However, although such grip devices are now widely used, they suffer drawbacks especially if they are fitted to frames for pushchairs of the type known as “umbrella-folding” due to the particular manner in which they close.
Such pushchair frames in fact fold both transversely and longitudinally (therefore in three dimensions) until they assume, when closed, a shape which can be likened to that of a closed umbrella.
It is evident that if the grip device described above is to be associated with umbrella-folding frames, it is necessary to provide such device in two or more connecting portions, which are rotatably articulated to each other so as to allow the transition of the frame from the extended condition to the collapsed condition. In any case, it is evident that in order to ensure sufficient rigidity of the grip device during use (and therefore when the frame is in the extended condition), it is advantageous to provide on such grip device means for locking mutual rotation among the different connecting portions.
Several constructive solutions have been proposed in this regard but they have not proved to be free from drawbacks.
The most widely used solutions connect to each other the connecting portions that constitute the grip device by means of joints between which locking elements, which can be actuated manually by the user, act.
Although such solutions allow to obtain, when the frame is in the extended position, a certain rigidity of the grip device, they have a certain awkwardness in use, because the user is forced, after placing the frame in the extended condition, to act on the locking elements in order to lock each joint. The same action must of course be performed before placing the frame in the collapsed condition.
The aim of the present invention is to eliminate or at least reduce drastically the drawbacks noted currently in grip devices particularly for pushchairs, prams and the like described above.
Within this aim, an object of the invention is to provide a grip device which has such features as to allow simplification of the operations for opening and closing the frame with which it is associated.
Another object of the present invention is to provide a grip device that is easy to use and offers the greatest assurances of reliability during operation.
Still another object of the invention is to provide a grip device which is constructively very simple and has a low production cost, so that its use is advantageous also from an economical standpoint.
This aim and these and other objects are achieved by a grip device 1, particularly for pushchairs, prams and the like, comprising a connecting body 2 provided with a plurality of connecting elements 20, which comprise two connecting ends 2d, which are coupled to a respective connecting element 3 formed at a respective side 4 of a frame 10 for pushchairs, prams and the like, and at least two connecting portions 2a, 2b, 2c, which are articulated to each other and connect said two connecting ends 2d, characterized in that it comprises reaction means 5, which act between at least one pair of said connecting elements 20 and are adapted to reverse the action applied to said at least one pair of connecting elements 20 during the transition of said frame 10 from an extended condition to a collapsed condition and vice versa.
Further characteristics and advantages will become better apparent from the description of some preferred but not exclusive embodiments of a grip device according to the invention, illustrated by way of non-limiting example in the accompanying drawings, wherein:
In the examplary embodiments that follow, individual characteristics, given in relation to specific examples, may actually be interchanged with other different characteristics that exist in other exemplary embodiments.
Moreover, it is noted that anything found to be already known during the patenting process is understood not to be claimed and to be the subject of a disclaimer.
With reference to the figures, a grip device, particularly for pushchairs, prams and the like, is designated generally by the reference numeral 1 and comprises a connecting body 2, which is composed of a plurality of connecting elements 20.
In particular, the connecting elements 20 comprise two connecting ends 2d, which are coupled, as described in greater detail hereinafter, to a respective connecting element 3, which is formed at a respective side 4 of a frame 10 for pushchairs, prams and the like: with reference to the embodiment shown in
The connecting body 2 comprises at least two mutually articulated connecting portions 2a, 2b.
According to the invention, the grip device 1 is provided with reaction means 5, which act between at least one pair 2a,2b; 2b,2c; 2a,2d; 2c,2d of the connecting elements 20 that form the connecting body 2.
In particular, the reaction means 5 are adapted to reverse the action applied to the respective connecting elements 20 during the transition of the frame 10 from the extended condition to the collapsed condition and vice versa.
According to a first embodiment, shown in the figures, the connecting elements 20 to which the reaction means 5 apply their action are constituted by one or more pairs of connecting portions 2a,2b; 2b,2c.
In particular, it can be seen that the reaction means 5 are adapted to apply to a respective pair of connecting portions 2a,2b; 2b,2c an action (shown schematically by the arrows F) which tends to move closer one another the two connecting ends 2d of the connecting body 2 when the frame 10 is (as shown in
Advantageously, the pair or pairs of connecting portions 2a,2b; 2b,2c are constituted by a first connecting portion 2a and a second connecting portion 2b, which are arranged sequentially and can rotate with respect to each other about a respective pivoting node 6.
In greater detail, the reaction means 5, during the transition of the frame 10 from the extended condition to the collapsed condition and vice versa, are in practice adapted to reverse the pushing action on the respective connecting portions 2a,2b; 2b,2c about the respective pivoting node 6, so as to ensure reversal of the torque applied to said connecting portions 2a,2b; 2b,2c about the respective pivoting node 6.
According to a preferred embodiment, shown moreover in
As an alternative, the reaction means 5 can be constituted by a cam device, which has a device body which is rigidly coupled to a first connecting portion 2a and a movable head which acts on the other connecting portion 2b or vice versa.
According to another embodiment, the reaction means 5 can be obtained by means of a flat spring, the pusher ends whereof engage a respective pusher portion supported by a respective connecting portion 2a,2b; 2b,2c.
According to this embodiment, the two connecting ends 2d of the connecting body 2 are coupled rotatably to the respective connecting element 3 formed on a respective side 4 of the frame 10.
In particular, the two connecting ends 2d of the connecting body 2 are usually free to rotate with respect to the respective connecting element 3 about an axis which is parallel to the longitudinal axis of the handle tube 4a.
According to a possible variation, the ends 2d for connecting the connecting body 2 to the sides 4 can be (rotationally) rigidly coupled to the connecting elements 3: in this case, nothing prevents said connecting ends 2d from being constituted directly by the upper free ends of the handle tubes 4a and in general of the sides 4.
In this case, the reaction means 5 might act between at least one of the connecting ends 2d and the connecting portion 2a or 2c that is associated therewith. The coupling between the connecting ends 2d and the connecting portion 2a, 2c associated therewith can be provided by providing the connecting end 2d with a cylindrical head having a substantially circular transverse cross-section and by providing the connecting portion 2a, 2c associated therewith with a cup-shaped end, which has a slightly larger outside diameter than the diameter of the cylindrical head. In this manner, the relative motion of the connecting portion 2a, 2c with respect to the connecting end 2d with which it is associated is allowed about a rotational axis which coincides substantially with the longitudinal axis of the cylindrical head and of the cup-shaped end. In this case, the reaction means can be obtained by providing a cam device, which has a device body which is rigidly coupled for example to the cylindrical head and a movable head which rotates rigidly with the cup-shaped end.
Advantageously, the connecting body 2 comprises three connecting portions 2a, 2b, 2c, which form two pairs 2a,2b; 2b,2c of connecting portions which are articulated to each other by means of a respective pivoting node 6.
According to another important aspect, between at least one pair of connecting elements 20 which are mutually arranged in sequence, and advantageously between one or more pairs of the connecting portions 2a,2b; 2b,2c, there are means 8 for locking the relative rotation between said pairs of connecting elements 20 about the respective pivoting node 6. In particular, said locking means 8 are adapted to lock the relative rotation between the two connecting elements 20 in the direction of rotation that occurs during the transition of the frame 10 from the collapsed condition to the extended condition.
The locking means 8 can be constituted by at least one locking tooth 9, which is formed on a first connecting portion 2a which has an abutment portion 9a designed to abut, when the frame assumes substantially the extended condition, against an abutment portion 9b formed on the other connecting portion 2b.
Operation of the grip device 1 according to the present invention is directly derivable from what has been described above.
In particular when for example the frame 10 is in the extended condition (as shown in
When the user wishes to move the frame 10 to the collapsed condition, he does not need to worry about the grip device 1, but he simply has to act on the frame 10. In a first step of closure, the action that the reaction means 5 apply to the pairs of connecting portions 2a, 2b, 2c must be overcome, but once the intermediate point (shown in the sectional view of
All the characteristics of the invention indicated above as advantageous, convenient or the like may also be omitted or be replaced with equivalents.
The invention thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims.
Moreover, nothing prevents the reaction means 5 from being constituted by one or more pneumatic pistons in which the body and the stem are respectively associated rotatably with the pairs of connecting portions 2a,2b; 2b,2c.
In practice it has been found that the invention has achieved the intended aim and objects in all its embodiments.
In particular, it has been found that the use of the described reaction means ensures, when the frame is in the extended condition, a sufficient rigidity of the grip device without having to actuate and deactivate complex locking elements.
Moreover, it has been observed that the reaction elements are capable of assisting the user during the operations for opening and closing the frame.
In practice, the materials used, as well as the dimensions, may be any according to requirements.
Thus, for example, it has been found that the springs that can be used for this purpose can be of different kinds; mention is made, in addition to the trap springs shown in the drawings, of flat springs shaped so as to be elastically deformable: among the many, mention is made of metallic ones but also of plastic ones.
The disclosures in Italian Patent Application No. VR2005A000107 from which this application claims priority are incorporated herein by reference.
Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.
| Number | Date | Country | Kind |
|---|---|---|---|
| VR2005A000107 | Sep 2005 | IT | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2006/008747 | 9/7/2006 | WO | 00 | 3/5/2008 |
