EP0007306A1

EP0007306A1 - A locking device for locking two relative each other movable parts

Info

Publication number: EP0007306A1
Application number: EP19790900059
Authority: EP
Inventors: Ottar Akselsen
Original assignee: OTTAR INNOVATIONER HB
Current assignee: OTTAR INNOVATIONER HB
Priority date: 1977-12-27
Filing date: 1979-07-16
Publication date: 1980-01-23
Also published as: SE406493B; WO1979000416A1

Abstract

Un dispositif de verrouillage de deux pieces mobiles l'une par rapport a l'autre (1, 2) dans l'un des sens de deplacement et de desserrage dans le sens oppose, dans lequel l'une des pieces (1) possede des dents et l'autre piece (2) supporte un element de retenue a ressort (6) cooperant avec les dents. Le but de l'invention est de fournir un dispositif de verrouillage simple et sur. Ceci a ete realise parce que l'element de retenue (6) est monte librement avec un mouvement de bascule et que la piece (1) pourvue de dents (3) est concue avec au moins deux creneaux (8), un a chaque extremite de la portion dentee, dont la profondeur est superieure a la longueur radiale de l'element de retenue (6), lesdits creneaux servant de positions de retour de l'element de retenue.A device for locking two parts movable with respect to each other (1, 2) in one of the directions of displacement and loosening in the opposite direction, in which one of the parts (1) has teeth and the other part (2) supports a spring retaining element (6) cooperating with the teeth. The object of the invention is to provide a simple and secure locking device. This has been achieved because the retaining element (6) is mounted freely with a rocking movement and the part (1) provided with teeth (3) is designed with at least two notches (8), one at each end of the toothed portion, the depth of which is greater than the radial length of the retaining element (6), said slots serving as return positions of the retaining element.

Description

A LOCKING DEVICE FOR LOCKING TWO RELATIVE EACH OTHER MOVEABLE PARTS

Background of the invention

The present invention refers to a locking device for locking two relative each other moveable parts in one of their directions of motion and releasing in the opposite direction of motion, one of the parts being provided with teeth or similar and the other part supporting a spring-loaded retaining member cooperating with the teeth.

Locking devices of the above mentioned kind are required for many purposes, but they have hitherto been relatively complicated or not completely reliable.

Summare of the invention

The purpose of the present invention is to provide a locking device which is characterized by its simple construction and its reliable operation. This has been achieved by the fact that the retaining member is freely swingably mounted and that the teeth-provided part is designed with at least two spaces of tooth, one at each end of the toothed path, with a depth exceeding the radial length of the retaining member, said spaces of tooth serving as turning stations for the retaining member.

Brief description of the drawings

The invention will now be further described with reference to the accompanying drawings, which show some embodiments. Figure 1 is a side view of a locking device according to the invention applied to telescopic tubes, Figure 2 shows on a larger scale a section accordinng to the line II - II in figure 1, Figure 3 is a longitudinal section through the locking device according to figure 2,

Figure 4 is a longitudinal section through a modifiied embodiment of the invention with the locking device placed within one of the telescopic tubes, Figure 5 is a section analogue with figure 4 but with the locking device in turning position, Figure 6 is a section through a locking device applied to a device with an arc-shaped toothed path, Figure 7 shows the device according to figure 6 in a position for turning the retaining member, and

Figure 8 is a section through a further embodiment of the invention.

Description of some preferred embodiments

The locking device according to the invention comprises two relative each other moveable parts 1 and 2, the first part 1 of which being provided with teeth 3 or similar along one side edge, while the second part 2 is provided with a locking device h comprising a retaining member 6 , which is freely swingably mounted about an axle 5 and which by a spring 7 is brought to engage the teeth 3 of the first part 1.

In the embodiment shown in the figures 1-3 the parts 1 and 2 comprise two telescopic rods or tubes, at which the teeth-provided rod 1 is displaceable in the tube 2. The rack 1 is at each end of the toothed path 3 provided with a space of tooth 8 with a depth exceeding the radial length of the retaining member 6, so that the retaining member in cooperation with said space of tooth 8 can be brought to turn. In such cases where several turnings are desired spaces of tooth can be arranged also between the end turning stations 8. In the embodiment shown the axle 5 is supported by a loop 9, which is fixed to the outer telescopic tube 2 and is situated just in front of a recess 10 in said tube.

In the embodiment according to the figures 4 and 5 the outer telescopic tube 2 is along one edge side provided with inwards directed teeth 3 cooperating with the locking device 4, which is arranged at the inner tube 1. The inner tube 1 has a U-shaped cross-section and is so arranged in the outer tube 2 that the teeth 3 are located between the shanks 11 of the inner tube 1. In the shanks 11 recesses for the axle 5 are arranged, said axle serving as a pivot for the freely swingable retaining member 6 in the same way as in the embodiment described above. The retaining member 6 is pressed against the teeth-provided inside of the outer tube 2 by means of the spring 7, which is so arranged that when the retaining member 6 is located in a space of tooth 8, as is shown in figure 5, the retaining member 6 will take a position between its two end positions. The spring 7 is preferably held by a clip 12 at the retaining member 6 and a clip 13 at the middle portion 14 of the U-shaped inner member 1.

The devices according to the figures 1-5 work in the following way. In one position, e.g. when the inner rod 1 is drawn out of the outer tube 2 the retaining member 6 will against the action of the spring 7 snap over the teeth 3 at the same time as the retaining member prevents the inner rod from being pushed back wards. When the retaining member 6 is in front of a space of tooth 8, the retaining member can be swung so much that it changes position and the inner rod 1 can be pushed back without the retaining member 6 offering any appreciable resistance. At the opposite end position the retaining member 6 will again snap into a space of tooth 8, so that the retaining member is turned back to its first starting position.

In the embodiment according to the figures 6 and 7 the toothed path of one of the parts 1 is arc-shaped, while the other part 2 is pivotallv mounted in the centre of the arc-shaped toothed path about a pivot pin 15. The retaining member 6 of the locking device 4 is in the same way as above freely swingably mounted about an axle 5. At both end portions of the toothed path 3 a deeper notch or a space of tooth with a larger depth than the length of the retaining member 6 is arranged. The device works in the same way as the earlier described embodiments. In this embodiment e.g. one part 1 can be moveable, while the second part 2 is fixed at a structural part.

In the embodiment according to figure 8 the toothed path is arranged at the fixed part 2, while the moveable part 1 supports the locking device 4 .

The embodiments which have been shown and described are only to be regarded as examples and a number of modifications are possible within the scope of the claims. Thus the retaining member can have a different design as well as the spring 7, which also can be placed in a different way than is shown in the drawings

Claims

C L A I M S

1. A locking device for locking two relative each other moveable parts in one of their directions of motion and releasing in the opposite direction of motion, one of the parts being provided with teeth or similar and the other part supporting a springloaded retaining member cooperating with the teeth, c h a r a c t e r i z e d i n, that the retaining member (6) is freely swingably mounted and that the teeth-provided (3) part (1) is designed with at least two spaces of tooth (8), one at each end of the toothed path, with a depth exceeding the radial length of the retaining member (β), said spaces of tooth serving as turning stations for the retaining member.

2. A locking device according to claim 1, c h a r a c t e r i z e d i n, that the spring (7) of the retaining member (6) is arranged to keep the retaining member in a position between its two end positions in the unaffected position of the retaining member.

3. A. locking device according to claim 1 or 2, c h a r a c t e r i z e d i n, that the teeth-provided (3) part (1) is provided with one or several spaces of tooth between the end position spaces of tooth.

4. A locking device according to any of the preceding claims, c h a r a c t e r i z e d i n, that the parts (1, 2) consist of telescopic rods or tubes.

5. A locking device according to any of the preceding claims, c h a r a c t e r i z e d i n, that one of the parts (1 and 2 resp. ) comprises an arc-shaped toothed path, while the second member is pivotally mounted in the centre of the arc-shaped toothed path.