A LOCKING DEVICE FOR LOCKING TWO RELATIVE EACH OTHER MOVABLE PARTS

Abstract: A locking device for locking two relative each other movable parts (1, 2) in one of their directions of motion and releasing in the opposite direction of motion, at which one of the parts (1) is provided with teeth or similar and the other part (2) supports a spring-loaded retaining member (6) cooperating with the teeth. The purpose of the invention is to provide a simple and reliable locking device. This has been achieved by the fact 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 (6), said spaces of tooth serving as turning stations for the retaining member.

Description: A LOCKING -DEVICE FOR LOCKING TWO RELATIVE EACH OTHER QVEABLE 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 coopera¬ ting with the teeth. Locking devices of the above mentioned kind are re¬ quired for many purposes, but thev 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 bv its simple construction and its reliable operation. This has been achieved by the fact that the retaining member is freely swingablv 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 refe¬ rence to the accompanying drawings , which show some embodiments. : * r j. BAO Figure 1 is a side view of a locking device accordi to the invention applied to telescopic tubes, Figure 2 shows on a larger scale a section accordin to the line II - II in figure 1, 5 Figure 3 is a longitudinal section through the lock device according to figure 2, Figure is a longitudinal section through a modifi embodiment of the invention with the locking device placed within one of the telescopic tubes, 10 Figure 5 is a section analogue with figure k but wi the locking device in turning position, Figure 6 is a section through a locking device appl to a device with an arc-shaped toothed path, Figure 7 shows the device according to figure 6 in 15 a position for turning the retaining member, and Figure 8 is a section through a further embodiment of the invention. Description of some Dreferred embodiments 20 The locking device according to the invention compr two relative each other moveable parts 1 and 2, the first part 1 of which being provided with teeth 3 o similar along one side edge, while the second part 25 2 is provided with a locking device h comprising a retaining member 6 . which is freely swingably mount about an axle 5 and which by a spring 7 is brought to engage the teeth 3 of the first part 1. 30 In the embodiment shown in the figures 1-3 the part 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 toothe path 3 provided with a space of tooth 8 with a dept 35 exceeding the radial length of the retaining member BADORiatNAt/ _ O y VVI 6, so that i*he 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 and 5 the outer telescopic tube 2 is along one edge side provided with inwards directed teeth 3 cooperating v/ith the locking device . 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 v/hen 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 I k of the U-shaped inner member 1. The devices according to the figures 1-5 work in the following wav . 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 *he 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 ■■ 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 large depth than the length of the retaining member 6 is arranged. The device works in the same wav 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 moveabl part 1 supports the locking device k . The embodiments which have been shown and described are only to be regarded as examples and a number of modifications are possible v/ithin 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 .O VI

Claims: C L A I 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 spring- loaded retaining member cooperating v/ith 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. *J. 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 ivotallv mounted in the centre of the arc-shaped toothed path. BADQBJGiNAt 

Inventors: AKSELSEN O
Applicants: AKSELSEN O, OTTAR INNOVATION HANDELSBOLAG, OTTAR INNOVATIONER HANDELSBOLAG
Application year: 1978
Main classification: F16B7
IPC codes: F16B7