EP2510825A1

EP2510825A1 - Rotary draw bar

Info

Publication number: EP2510825A1
Application number: EP10829513A
Authority: EP
Inventors: Roger Lu
Original assignee: Xiamen Sunnypet Products Co Ltd
Current assignee: Xiamen Sunnypet Products Co Ltd
Priority date: 2009-11-10
Filing date: 2010-11-08
Publication date: 2012-10-17
Anticipated expiration: 2030-11-08
Also published as: CN201550780U; WO2011057549A1; EP2510825A4; EP2510825B8; EP2510825B1

Abstract

A rotary draw bar used for drawing a case comprises a fixed rod (1), a fixed base (21, 22), a rotating shaft (3) and a telescopic rod (41, 42). One end of the fixed rod (1) is connected with the fixed base (21, 22). The rotating shaft (3) is arranged in an internal cavity of the fixed base (21, 22) and rotatably matches with the internal cavity. The telescopic rod (41, 42) is a hollow rod, of which a front end is in linking connection with the rotating shaft (3). A jumping bead device is arranged in a central hole at the front end of the telescopic rod (41, 42), and comprises a support (411), a push rod (412), a spring (413) and jumping beads (414). The support (411) is arranged in the central hole. The push rod (412) is arranged on the support (411) and slidingly matches with the support (411). The spring (413) is arranged inside the support (411). One end of the jumping bead (414) is connected with the spring (413), and another end of the jumping bead (414) is exposed out of the telescopic rod (41, 42). The fixed base (21, 22) comprises an inclined surface for the jumping bead (414) to slidingly contact and a location hole for the jumping bead (414) to be embedded in.

Description

Field of Invention

The present invention relates to a draw bar. In particular, the present invention relates to a rotary draw bar for pulling cases or bags.

Background

Conventional draw bars for pulling cases or bags typically can only stretch out and draw back, but cannot rotate relative to its perpendicular plane. Thus, the pulled cases or bags can only move in a tilt state, but cannot move in a horizontal state. When things such as pets (e.g., dogs and cats) in the case or bag need to be maintained in horizontal state, this is not possible to achieve with the conventional draw bars. Currently, some products have draw bars that can make rotation. However, the draw bar can only have a one-section telescopic rod, which limits the extension in length. In addition, the rotary structure of the draw bar is relatively complex, with high cost and less reliability.

Summary

It is an object of the present invention to provide a rotary draw bar that not only has simple structure, reliable operation, less space occupancy, and can randomly change the number of sections of the telescopic rod, but also can rotate.
In order to solve the above problem, the present invention provides the following solutions:
The present invention provides a rotary draw bar having a fixed rod, a fixed base, a rotary shaft, and a telescopic rod. The fixed rod has one end connected with the fixed base. The rotary shaft is positioned in an inner cavity of the fixed base and rotatably fits with the inner cavity of the fixed base. The telescopic rod is a hollow rod, with a leading end of the telescopic rod linked with the rotary shaft. A jumping bead device is arranged in a central hole at the leading end of the telescopic rod. The jumping bead device has a support, a push rod, a spring and a jumping bead. The support is positioned in the central hole at the leading end of the telescopic rod. The push rod is positioned on the support and slidably fits with the support. The spring is positioned in the support. The jumping bead has one end connected with the spring, and the other end exposed out of the telescopic rod. The fixed base has an inclined surface for the jumping bead to slidably contact, and a positioning hole for embedding the jumping bead.
The fixed rod preferably is a hollow rod.
The hollow rod preferably has a rectangular section.
The linkage between the leading end of the telescopic rod and the rotary shaft preferably use rabbet joint. The rotary shaft has a radial rabbet, which is provided with an axial opening for exposing the jumping bead. The telescopic rod has a choke plug at the leading end. The leading end of the telescopic rod embeds into the radial rabbet, and the axial opening faces to the inclined surface and positioning hole on the fixed base.
The telescopic rod preferably is composed of at least two sections of hollow rods in nested connection. Each section of hollow rods has a leading end that is provided with a jumping bead device. Each section of the hollow rods of the telescopic rod preferably has a rectangular cross section.
The fixed base preferably is composed of a left part and a right part that are joined in alignment. The right part has an inclined surface and a positioning hole thereon.
In use, the fixed rod and fixed base are secured at a bottom of the case or bag. When in use, the telescopic rod needs to be stretched out. The second section hollow rod will be pulled backwards. The push rod of the jumping bead device will back out under the action of the spring. At the same time, the spring will pop out the jumping bead. The exposed jumping bead is in contact with the inclined surface of the fixed base, to rotate the telescopic rod upwards. The telescopic rod will rotate with the rotary shaft. During rotation, the jumping bead slides on the inclined surface of the fixed base. When the telescopic rod rotates a certain angle, the jumping bead will embed into the positioning hole to position the telescopic rod. Only by setting the location of the positioning hole as desired, the rotational angle of the telescopic rod can be controlled and adjustment of the position of the case or bag can be realized (e.g., to have the case or bag in horizontal position). When not in use, the telescopic rod needs to be drawn back. The second section hollow rod will be pushed forwards. The bottom surface of the support of the jumping bead device at the leading end of the second section hollow rod will press the push rod of the jumping bead device at the leading end of the first section hollow rod, to make the push rod move forward, to force the spring of the jumping bead device at the leading end of the first section hollow rod to be tightened, so that the jumping bead of the jumping bead device at the leading end of the first section hollow rod will be retracted and not exposed. This allows the jumping bead to leave the positioning hole, and the telescopic rod can downwardly turn around. When the telescopic rod rotates to the initial state (i.e., the telescopic rod is coaxial with the fixed rod), the telescopic rod can be received in the fixed rod. This substantially reduces the space occupied.
Thus, the present invention not only is simple in structure, reliable in operation, occupies less space and can randomly change the number of sections of the telescopic rod, but also can rotate and is very convenient to use.

Brief Description of the Drawings

Fig. 1 schematically shows a structure of a draw bar according to one embodiment of the present invention.
Fig. 2 is an exploded view of the draw bar shown in Fig. 1.
Fig. 3 schematically shows an inner structure of the draw bar shown in Fig. 1 (in Fig. 3, the left part is omitted).
Fig. 4 schematically shows a rotary shaft according to one embodiment of the present invention.
Fig. 5 schematically shows a telescopic rod according to one embodiment of the present invention.

Detailed Description

Now turning to Figs. 1-5, the present invention provides a rotary draw bar comprising a fixed rod 1 (hollow rod), a fixed base (composed of left part 21 and right part 22 joined in alignment), a rotary shaft 3 and a telescopic rod (composed of first section hollow rod 41 and second section hollow rod 42 in nested connection).
The fixed rod 1 has one end connected with the fixed base. The rotary shaft 3 is positioned in an inner cavity of the fixed base and rotatably fits with the inner cavity of the fixed base. A leading end of the first section of hollow rod 41 of the telescopic rod is in rabbet joint with the rotary shaft 3 (linkage connection). The rotary shaft 3 has a radial rabbet 31, which is provided with an axial opening 32 for exposing the jumping bead 414 of the jumping bead device. A choke plug 43 is positioned at the leading end of the first section hollow rod 41. The leading end of the first section hollow rod 41 embeds into the radial rabbet 31, and the axial opening 32 faces the inclined surface 23 and positioning hole 24 on the fixed base.
A jumping bead device is arranged in a central hole at the leading end of the first section hollow rod 41. The jumping bead device in the first section hollow rod 41 has a support 411, a push rod 412, a spring 413 and a jumping bead 414. The support 411 is secured in the central hole at the leading end of the first section hollow rod 41. The push rod 42 is positioned on the support 411 and slidably fits with the support 411. The spring 413 is positioned in the spring hole of the support 411. The jumping bead 414 has one end connected with the spring 413, and the other end exposed radially out of the hollow rod 41. The right part 22 has an inclined surface 23 for the jumping bead 414 to slidably contact, and a positioning hole 24 for embedding the jumping bead 414. An identical jumping bead device is also arranged in a central hole at the leading end of the second section hollow rod 42. The jumping bead device has a support 421, a push rod 422, a spring 423 and a jumping bead 424. The jumping bead 424 is positioned in the positioning hole (not shown in Figs. 1-5) on the inner wall of the central hole at the leading end of the first section hollow rod 41. The second section hollow rod 42 has a handle 44 at the trailing end.
In use, the fixed rod 1 and fixed base are secured at the bottom of the case or bag.
When in use, the telescopic rod needs to be stretched out. The second section hollow rod 42 will be pulled backwards. The push rod 42 of the jumping bead device will back out under the action of the spring 423. At the same time, the spring 423 will pop out the jumping bead 424. The exposed jumping bead 424 is in contact with the inclined surface 23 of the fixed base, to rotate the telescopic rod upwards. The telescopic rod will rotate with the rotary shaft 3. During rotation, the jumping bead 424 slides on the inclined surface 23 of the fixed base. When the telescopic rod rotates a certain angle, the jumping bead 424 will embed into the positioning hole, to position the telescopic rod. Only by setting the location of the positioning hole as desired, the rotational angle of the telescopic rod can be controlled and adjustment of the position of the case or bag can be realized (e.g., to have the case or bag in horizontal position).
When not in use, the telescopic rod needs to be drawn back. The second section hollow rod 42 will be pushed forwards. The bottom surface of the support of the jumping bead device at the leading end of the second section hollow rod 42 will press the push rod 412 of the jumping bead device at the leading end of the first section hollow rod 41, to make the push rod 412 move forward, to force the spring 413 of the jumping bead device at the leading end of the first section hollow rod 41 to be tightened, so that the jumping bead 414 of the jumping bead device at the leading end of the first section hollow rod 41 will be retracted and not exposed. This allows the jumping bead to leave the positioning hole, and the telescopic rod can downwardly turn around. When the telescopic rod rotates to the initial state (i.e., the telescopic rod is coaxial with the fixed rod 1), the telescopic rod can be received in the fixed rod 1. This substantially reduces the space to be occupied.

Claims

A rotary draw bar comprising:
a fixed rod, a fixed base, a rotary shaft, and a telescopic rod, wherein the fixed rod has one end connected with the fixed base, and wherein the rotary shaft is positioned in an inner cavity of the fixed base and rotatably fits with the inner cavity of the fixed base;

wherein the telescopic rod is a hollow rod with a leading end of the telescopic rod in linkage connection with the rotary shaft;

wherein a jumping bead device is arranged in a central hole at the leading end of the telescopic rod, the jumping bead device having a support, a push rod, a spring and a jumping bead, wherein the support is positioned in the central hole at the leading end of the telescopic rod and the push rod is positioned on the support and slidably fits with the support;

wherein the spring is positioned in the support, and the jumping bead has one end connected with the spring and the other end exposed out of the telescopic rod; and

wherein the fixed base has an inclined surface for the jumping bead to slidably contact, and a positioning hole for embedding the jumping bead.
The rotary draw bar of claim 1, characterised in that the fixed rod is a hollow rod.
The rotary draw bar of claim 2, characterised in that the hollow rod has rectangular cross section.
The rotary draw bar of claim 1, characterised in that the linkage connection between the leading end of the telescopic rod and the rotary shaft uses a rabbet joint, wherein the rotary shaft has a radial rabbet, which is provided with an axial opening for exposing the jumping bead, wherein a choke plug is positioned at the leading end of the telescopic rod, the leading end of the telescopic rod embedding into the radial rabbet, and wherein the axial opening faces the inclined surface and positioning hole on the fixed base.
The rotary draw bar of claim 1, characterised in that the telescopic rod is composed of at least two sections of hollow rods in nested connection, each section of hollow rods having a leading end that is provided with a jumping bead device.
The rotary draw bar of claim 5, characterised in that each section of the hollow rods of the telescopic rod has a rectangular cross section.
The rotary draw bar of claim 1, characterised in that the fixed base is composed of a left part and a right part joined in alignment, wherein the right part has an inclined surface and a positioning hole thereon.