EP1500759A1 - Clip with spring loaded pin - Google Patents

Abstract

The locking device comprises basal spring with two curved blades (21, 22) extending upwards to a flange, and a locking pin oriented perpendicular to this flange. An independent claim is also included for telescoping hollow profiles or pipes secured in position longitudinally relative to one another by means of the proposed locking device.

Description

The invention relates to Vorsteckfederstifte according to the preamble of claim 1 and telescopically in one another slidable hollow sections or tubes with prefill spring pins according to the preamble of claim 8.

Telescopically telescoping hollow sections or tubes are used, for example, as height-adjustable legs or corner posts in foldable tents, as described in EP-A-0'514'574 and marketed by the applicant very successfully under the trademark "Pro Tent®" used , Known from WO02 / 08549 of the applicant octagonal telescopic tubes with grooves for receiving Kederprofilen are made of light metal, preferably made of aluminum, and in which only the outer surfaces are anodized. The inner and outer tubes of the corner posts are provided at predetermined positions with corresponding holes, and can be locked by spring-loaded locking pins in desired relative positions to each other. A widely used type of locking pin formed integrally from a sheet metal strip according to US-A-6,089,247 is shown in FIG. The free rear end of the spring plate comes to lie on the inside of the metal profile and can, in the case of an inside non-anodized aluminum profile lead to abrasion and chips. The abraded aluminum particles can accumulate between inner and outer telescopic tube, settle and affect the sliding mobility of the tubes to each other. In the worst case, it may even lead to jamming or blocking of the pipes against each other.
The known locking pins are not very stable in position and tend to "disappear" in the profile when fully pressed into the profile. One reason for this is the V-shaped spring body, which does not push the pin exactly vertically upwards, but still exerts shares of transverse forces. To avoid complaints from customers, it must be ensured that the locking pins are stable in position. In the prior art according to FIG. 1, this problem has been solved in that the rear end of the spring is welded or soldered to the hollow profile in order to prevent displacement. However, this can be done only with terminally positioned in the hollow profile locking pins. If the locking pins have to be positioned further inside the profile, they can only be fixed in such a way there with great effort.
When inserting the known spring-loaded locking pins in the telescopic tubes tilt this easily and also scratch the inner wall. The tilting makes assembly at different points in the profile more difficult.

The object of the invention is to provide a Vorsteckfederstiftes of the aforementioned type, which the Do not have disadvantages of the known versions.

This object is achieved according to the invention by the characterizing Characteristics of claim 1 solved.

Further preferred embodiments are in the dependent Claims circumscribed.

Figur 1

einen Querschnitt durch einen federkraftbeaufschlagten Feststellstift wie er aus dem Stand der Technik bekannt ist, angeordnet in einem Vierkant-Teleskoprohrsystem;

Figur 2

einen Federstift gemäss einer bevorzugten Ausführungsform der Erfindung;

Figur 3

den Federstift gemäss Figur 2 angeordnet in einem Teleskoprohr, wobei die Wand des Rohres teilweise weggelassen und das Rohr Verkürzt dargestellt ist;

Figur 4

eine Sicht in ein Teleskoprohr mit eingesetztem Federstift, wobei das äussere Rohr geschnitten und nur teilweise dargestellt ist;

Figur 5

einen Längsschnitt durch einen Federstift gemäss der Figuren 2 bis 4; und

Figur 6

einen Längsschnitt durch einen Federstift gemäss einer weiteren Ausführungsform der Erfindung.

In the following two embodiments of the subject invention are explained in detail with reference to the drawing. Show it:

FIG. 1

a cross section through a spring-loaded locking pin as known from the prior art, arranged in a square telescopic tube system;

FIG. 2

a spring pin according to a preferred embodiment of the invention;

FIG. 3

the spring pin according to Figure 2 arranged in a telescopic tube, wherein the wall of the tube is partially omitted and the tube is shown shortened;

FIG. 4

a view into a telescopic tube with inserted spring pin, the outer tube is cut and shown only partially;

FIG. 5

a longitudinal section through a spring pin according to Figures 2 to 4; and

FIG. 6

a longitudinal section through a spring pin according to another embodiment of the invention.

i) die Breite B_F der Federzungen 21, 22 entspricht annähernd der Breite B_p der engsten Stelle zwischen den Innenwänden im Hohlprofil 10;

ii) die Höhe H_F des Federelementes 2 ist so bemessen, dass die Federzungen im eingesetzten Zustand leicht vorgespannt sind;

iii) die Höhe H_B des Bolzens 5 ist so bemessen, dass der Bolzen um eine Strecke D aus dem ihn aufnehmenden Rohr herausragt, welche kleiner ist als der maximale Federweg des Federelementes 2, so dass der Bolzen mindestens so weit in das Rohr gedrückt werden kann, dass seine Spritze 26 bündig mit der Aussenwand 104 zu liegen kommt;

iv) die lichte Höhe H_BM des zylindrischen Bolzenmantels 51 ist so bemessen, dass der zylindrische Bolzenmantel 51 mindestens um eine Wandstärke der Rohre 10, 11 aus dem inneren Rohr 10 herausragt; und

v) der Durchmesser des Flansches 20 ist so bemessen, dass mindestens ein innerer Oberflächenbereich 103, 105 des aufnehmenden Profils 10 die vertikale Verschiebbeweglichkeit von Flansch 20 und Bolzen 5 limitieren und als Anschlagfläche wirken.

1 shows a Vorsteckfederstift 1 is shown according to a first embodiment of the present invention. A basal spring element 2 made of an elastomer, preferably a polyoxymethylene (POM) material, carries a cylindrical pin 5, which is rounded at its upper end. The bolt 5 is preferably provided with a metal sheath 51 to prevent shearing safely even at high loads. The bolt 5 is perpendicular to a circular disc-shaped flange 20 which has a peripheral circumferential stop collar 28. From the flange 20, two curved spring tongues 21, 22 extend downwards. The spring tongues 21, 22 are bent in opposite directions and each describe approximately a quarter circle, so that at their basal ends in each case an approximately horizontal lower sliding surface 23, 24 is formed. These sliding surfaces 23, 24 come in the inserted state, as shown in Figure 3, to lie on an inner wall of a telescopic tube 10. By pressure on the bolt tip, the spring tongues 21, 22 are spread and the sliding surfaces 23, 24 allow sliding apart and partial unwinding of the spring tongues on the inner wall. When the user presses on the bolt tip 26, the applied force is transmitted along the bolt longitudinal axis and introduced approximately tangentially into the flange-side end regions of the spring tongues 21, 22. The force exerted on the bolt 5 force is absorbed by the approximately circular arc-shaped spring tongues in equal parts, forwarded and stored by the deformation of the spring tongues 21, 22 for the most part. As soon as the pressure on the bolt 5 subsides, or fails altogether, the two spring tongues 21, 22 again assume their original shape and push the bolt 5 vertically upwards into a locking position. The wide spread design of the spring tongues 21, 22 and their Bilateralsymmetrie prevents the lateral slipping of the locking pin in the profile 10th
Since the spring element 2 are made of a plastic material, preferably of POM, the spring tongues 21, 22 on the inner wall 102 of the telescopic tube 10 can slide and rub, without causing the abrasion of pipe material.
With reference to Figures 3 and 4, which show a spring pin 1 in the inserted state, will be discussed in the following more accurate dimensioning of the spring pins. The pins 1 are preferably adapted to the used telescopic profiles 10, 11 that the following points are met:

i) the width B _{F of} the spring tongues 21, 22 corresponds approximately to the width B _{p of} the narrowest point between the inner walls in the hollow profile 10;

ii) the height H _{F of} the spring element 2 is dimensioned so that the spring tongues are slightly biased in the inserted state;

iii) the height H _{B of} the bolt 5 is dimensioned such that the bolt protrudes by a distance D from the tube receiving it, which is smaller than the maximum travel of the spring element 2, so that the bolt are pushed at least as far into the tube may cause its syringe 26 to lie flush with the outer wall 104;

iv) the clear height H _{BM of} the cylindrical bolt jacket 51 is dimensioned such that the cylindrical bolt jacket 51 protrudes from the inner pipe 10 at least by a wall thickness of the pipes 10, 11; and

v) the diameter of the flange 20 is dimensioned so that at least one inner surface portion 103, 105 of the female profile 10 limit the vertical displacement mobility of the flange 20 and pin 5 and act as a stop surface.

Item i) ensures that the spring tongues 21, 22 can not slip away transversely to their spreading direction. In the present octagonal profile with Kedernuten this leads to a relatively slim tongue shape. In a square profile, as shown in Figure 1, the tongues would preferably have in the region of the sliding surfaces 23, 24 approximately the width of the square profile.
The shape according to ii) ensures that the bolt 5 of the spring pin 1 in the absence of force from the outside is safe in the locked position and can not wobble or rattle in the profile 10.
By dimensioning iii) can be 5 of the bolt by corresponding pressure completely sink in the profile 10, so that an outer profile 11 can be pushed over it. The bolt tip 26 is rounded and preferably made of plastic, so that there is no abrasion on the inner wall of the outer profile 11. The spring 1 can even be compressed at least to the extent that it is inserted from one end into the profile tube 10, 11 and then moved by means of a suitable rod to the predicted position along the tube longitudinal axis when inserted into the profile 10.
In the embodiment of Figure 4 with a complex profile geometry bolt height (according to iii)) and flange diameter (v)) were coordinated so that the flange 20 comes with its peripheral circumferential stop collar 23 on the inner walls of the two Kedernuten 103, 105 to lie which are arranged adjacent to the profile wall 104, which passes through the bolt 5. The stop collar is preferably inclined in such a way that it comes to rest almost completely over the inner walls of the two welt grooves 103, 105.
In a simple square profile, the flange 20 in diameter only has to be larger than the bore 107 accommodating the bolt, so that the inside of the profile wall 104 surrounding the bore 107 serves as a stop surface.
iv) ensures that the bolt 5 comes to lie in its locking position with the circular cylindrical jacket portion 51 on the parallel inner walls of the corresponding holes 107 of the inner 10 and the outer 11 profile tube. The clamping force acts perpendicular to the lateral surface and the bolt can not be pressed inwards. The metal jacket reliably prevents the shearing of the bolt even with large forces.

In the longitudinal section of Figure 5 can be seen how the Metal shell 51 is held on the spring element 2. In the illustrated embodiment, the jacket 51 in the lower Region provided with an annular groove 52. The hollow coat 51 becomes encapsulated in the injection mold at the base, so that the Plastic material of the flange 20, the groove 52 fills and the Sheath 51 insoluble and stable connected to the spring element 2 is. Since the sheath 51 is hollow inside and open at the top, fills the - preferably colored - plastic material when Spraying the jacket completely and forms a plastic core 25. The POM material exits the stud tip 26 and forms a color accentuated pressure point. The tip is like already described above cambered and by the Plastic material, the friction is greatly reduced. Both facilitates the displacement of the telescopic tubes 10, 11th against each other with pressed pin 1.

In the longitudinal section of Figure 6 is another embodiment of the Invention subject represented. The bolt casing 51 'is closed here at the top. Such Vorsteckfederstifte are preferably in outer profiles 11 to lock of Attachment elements or movably mounted Plastic tabs used. So it can not be used for rubbing metallic bolt tip come on an inner pipe wall.

List of reference numbers

Vorsteckfederstift

1

Inner telescopic tube

10

Outer telescopic tube

11

Inside profile wall

102

Interior wall Kedernut

103, 105

profile wall

104

drilling

107

spring element

2

flange

20

spring tongues

21, 22

sliding surface

23, 24

Plastic core

25

Plastic tip

26

stop collar

28

bolt

5

metal sheath

51

ring groove

52

Wide spring tongue

B _F

Wide profile

B _p

Height spring element

H _F

Height bolt

H _B

Height bolt jacket

H _BM

Claims (10)

Vorsteckfederstift (1) comprise a basal spring element (2) and a bolt (5), characterized in that the bolt (5) perpendicular to a flange (20) of the spring element (2) and the flange (20) has two bent spring tongues (21, 22) extend downwards. Vorsteckfederstift (1) according to claim 1, characterized in that the spring element (2) made of a plastic, preferably a polyoxymethylene (POM) material, is made. Vorsteckfederstift (1) according to claim 2, characterized in that the bolt (5) is provided with a metal sheath (51) to prevent shearing safely even at high loads. Vorsteckfederstift (1) according to one of claims 1 to 3, characterized in that the spring tongues (21, 22) are mirror images of each other in opposite directions and each describe approximately a quarter circle, so that at their basal ends in each case an approximately horizontal lower sliding surface (23, 24) is formed. Vorsteckfederstift (1) according to claim 4, characterized in that the spring tongues (21, 22) are integrally formed on the flange (20), that the force exerted on a pin syringe (26) along the longitudinal axis of the bolt forwarded and approximately tangentially in the spring tongues (21 , 22). Vorsteckfederstift (1) according to one of the preceding claims 3 to 5, characterized in that the jacket 51 is provided in the lower region with an annular groove (52) and is injection-molded in the injection molding tool on the base, so that the plastic material of the flange (20) the groove (52) fills and the jacket (51) undetachable and stable with flange (20) and spring element (2) is connected. Vorsteckfederstift (1) according to one of the preceding claims 3 to 6, characterized in that the bolt (5) has an inner plastic core (25) and plastic material at the bolt tip (26) forms a color accentuated pressure point. Telescopically telescoping hollow profiles or tubes (10, 11) with at least one Vorsteckfederstift (1) according to one of the preceding claims, characterized in that a maximum width B _{F of} the spring tongues (21, 22) approximately a width B _p a narrowest point between the Inner walls in the hollow profile (10, 11) corresponds, so that the spring tongues (21, 22) are prevented from slipping transversely to their spreading. Telescopically telescoping hollow sections or tubes (10, 11) according to claim 8, characterized in that height H _{F of} the spring element (2) is dimensioned so that the spring tongues (21, 22) are slightly biased in the inserted state. Telescopically telescoping hollow sections or tubes (10, 11) according to claim 8, characterized in that the tubes (10, 11) height-adjustable legs, corner posts or length-adjustable cross struts of folding tents are.

Images