FI87683B - STAONGKOPPLING MED OMSTAELLBAR LAENGD - Google Patents

Abstract

1. A longitudinally adjustable coupling for rods or bars or the like, more particularly for positioning bar fittings for doors or windows or the like, a U section coupling shoe (3) being provided at the end of one (2) of two rods or bars or the like (2, 6) required to be coupled together, the shoe (3) being in the form of a flexible stamping and having on the inside of at least one arm (4) fine toothing (5) contrived during manufacture, while the other rod or bar or the like (6) has at least on the narrow side intended for coupling complementary fine toothing (7) which extends over a considerable length and which enables the rod or bar or the like (6) to be engaged between the arms (4) of the shoe (3), the fine toothing (5) of the shoe (3), which is unitary with the rod or bar or the like (2), being formed by die stamping, characterised in that the rod cross-section decreases (9) in thickness (10) near the shoe (3) and is correspondingly increased (18) in width (13), the profile (15, 16) of the fine toothing (5) extends transversely over the whole width (14) of the reduced-thickness part (11) of the rod or bar or the like, and the side panels (18) of the reduced-thickness part (11) of the rod or bar or the like, such panels extending beyond the width (13) of the normal cross-section of the rod or bar or the like, are raised at least substantially by 90 degrees relatively to the plane of the rod or bar or the like.

Description

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Length-adjustable bar coupling Stängkoppling med omställbar längd

The invention relates to a length-adjustable rod coupling, in particular for rod closures for windows, doors or the like, in which a U-shaped coupling ring 10 is formed at one end from two rods to be connected to each other, which is stamped and bent into a U-shaped coupling ring with at least one branch on the inner side while the second rod has, at least on the narrow side for coupling, counter-fine toothing extending over a relatively long length range, by means of which it can be inserted between the branches of the coupling shoe, and in which the coupling shoe formed integrally with the rod 15 is finely embossed.

A length-adjustable rod switch of the above-mentioned type of drive rod fittings for windows, doors or the like is already known from DE-PS 2 635 446. It has proven to be the best in use due to its high dimensional stability.

In a state-of-the-art length-adjustable bar coupling *. the rod with the clutch shoe must be made by heel stamping from a plate blank having in the region of the U-shaped clutch shoe to be manufactured: a wing extending beyond the normal width of the rod, the width of which corresponds approximately to the subsequent height of the U-branch formed therein. The starting material required to make a rod with a clutch shoe must therefore have a correspondingly larger width than the later finished rod.

However, DE-OS 2 635 708 has already proposed that the clutch shoe be manufactured separately from the plate blank by an embossing and then attached to the rod part, for example by riveting. However, also in this manufacturing method, plate blanks for clutch shoes are made from plate strips, the initial dimensions of which are substantially larger than the dimensions of the plate blank required for making the clutch shoe.

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However, in accordance with DE-GM 7 603 047, a flat material, in particular a hoop steel with a constant width along the entire length, has already been used for the production of bars with one-piece clutch shoes with fine teeth in each of the inner longitudinal edges. In order to form the clutch shoe, in the vicinity of the ends of the hoop steel strip, strips projecting above the wide side are formed on the edge sides, which are strips extruded in a material-like manner, the inner edge of which has an immediately toothed cutting surface.

This known length-adjustable rod coupling is suitable for the form-fitting connection of two partially overlapping lip rail parts of a drive rod fitting, which parts are each secured against displacement by means of a plurality of screws to a support component, for example a window frame or a door frame.

It has also already been suggested (see DE-GM 8 324 586) that a clutch shoe 20 of the type known from DE-GM 7 603 047, for example for connecting lip rails of drive rods, is used to form length-adjustable rod switches between movable drive rods of such drive rods. However, since in this case the clutch shoes are subject to permanently variable longitudinal thrusting forces, it has been found that with the avoidable heavy-duty loading of the clutch shoes, the clutch shoes may not suffer any damage or at least deformations which permanently interfere with the continuous use of the drive rod clamp.

The object of the invention is to provide a rod coupling of the type described above, in which a flat material strip, in particular a hoop steel strip, having the same width dimension along its entire length, can be used as a starting material for the manufacture of a rod provided with a coupling shoe. In this case, however, the clutch shoe must be provided with U-branches projecting over its entire length along the entire wide side of the rim material, which are integrally attached to the rod and have a fine tooth formed on the inner surface.

According to the invention, this object is solved by the features of the first claim, namely by reducing the thickness and width of the rod cross-section in the clutch shoe, the side wings of the reduced rod portion are bent up at least about 90 ° with respect to the rod plane.

It has been found that the side wings necessary to form the U-branches of the clutch shoe, projecting beyond the width of the normal drive rod cross-section, can be formed by suitably flattening the short main portion of the starting material and provided with fine teeth without compromising the usability of the clutch shoe. Namely, the material reinforcement provided by the flattening ensures that the U-shaped clutch shoe also has a form strength with a reduced wall thickness compared to the normal operating rod cross-section, which is many times higher than if the flat material plane is bent upwards above its wide side.

20

According to the invention, an embodiment which has proved to be very advantageous and which, according to claim 2, consists in that the thickness is reduced. the total thickness of the rod part corresponds approximately to the fine toothing. twice the profile height and then fine toothing; The profile height is made approximately equal to one third of the thickness of the normal tan cross-section.

It has further proved expedient if the stretched width of the rod part reduced in thickness according to claim 3 is dimensioned at least almost twice as large as the thickness of the normal rod cross-section. Thus, in cross-section, both arms of the U-shaped clutch shoe may rise above the wide side of the rod by a dimension approximately corresponding to its normal cross-sectional thickness. Adjacent - 35 rod to be gripped with the clutch shoe, which has fine teeth on its narrow sides, *: becomes surrounded by the clutch shoe over its entire cross - sectional height.

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Another feature of the bar coupling according to the invention according to claim 4 is also that the profile of the fine teeth in the web part parallel to the normal bar cross section is at least partially flattened so that the support surface for the wide side of the adjacent bar connected to the coupling shoe is correspondingly enlarged.

The method according to the invention for manufacturing a length-adjustable rod coupling according to claim 5 is mainly characterized in that the tooth profile of the fine toothing 10 is formed directly by flattening the drive rod cross-section and then bending both side wings of the flattened cross-section.

According to claim 6, it is then further proposed that the flattened rod cross-section 15 is bent at right angles with the toothed side surfaces at least up to the plane of the corresponding wide side of the normal rod cross-section.

Finally, from a manufacturing point of view, it has proved to be very advantageous if, according to the teaching of claim 7, the starting material is flattened a distance corresponding to twice the length of the clutch shoe and. ·,; is provided with toothing and is subsequently subjected to a separating cut at half the length of the toothing, either before the side wings of the flattened bar cross-section are bent upwards in a U-shape, or; 25 after they have first been bent up.

Other advantages of the invention will be described in detail below with reference to the drawing.

Fig. 1 shows in a three-dimensional exploded view a length-adjustable rod switch with a clutch shoe in an approximately natural size.

Figure 2 shows on a larger scale the clutch shoe in cross-section.

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Figure 3 also shows the clutch shoe on a larger scale in a side view and partly in longitudinal section.

Figure 4 shows a top view of the clutch shoe according to Figures 2 and 3.

5

Figures 5-7 show very advantageous method steps for manufacturing a clutch shoe of a length-adjustable rod clutch.

Figure 1 of the drawing shows a length-adjustable rod switch 1 with a first rod forming the drive rod 2. In this case, the drive rod 2 has at its free end in cross-section an approximately U-shaped, upwardly open clutch shoe 3 provided with a fine toothing 5 at least on the inside of the branch, preferably both branches 4, whose tooth profiles run substantially transversely to the longitudinal direction of the drive rod 2.

The second rod, for example likewise the drive rod 6, consists of a rectangular flat material in cross section and is provided with at least one, preferably on both narrow sides, a fine toothing 20 which is counter-toothing to the fine toothing 5. The drive rod 6 can be in, from above, firmly engage the fine toothing 5 of the U-shaped clutch shoe 3 on the drive rod 2. from above.

*. ! Since both arms 4 of the clutch shoe 3 then engage in use; 25 to the push rod 6 from its narrow sides, the clutch shoe 3 can reliably receive the --- --- longitudinal forces occurring in the joint longitudinal displacement of the drive rods 2 and 6, without the coupling joint being disengaged.

'·. ·· 30 Essential in the length-adjustable rod switch 1 shown in Fig. 1 is; the fact that, in cross-section, the U-shaped clutch shoe 3 consists of the same material from which the drive rod 2 is made, namely the rim; steel strip. Namely, it means very much that the drive rod 2 and the clutch shoe 3 are made in one piece, whereby the bottom or web 8 of the clutch shoe ·> - · '35 is flush with at least the upper side f of the drive rod 2.

6 s 7 583 The drive rod 2 is made together with the clutch shoe 3 as a stamping or folding part, whereby the clutch shoe 3 as a whole, i.e. with both its branches 4, the base or web 8 and the fine teeth 5, is made by the heel stamping method.

5

The embossing method is performed on a predetermined longitudinal portion 11 of a steel strip 12 or the like forming the starting material, which has the same width 13 over its entire length, which coincides with the cross-sectional width of the drive rod 2.

10

The embossing method then reduces the cross-sectional thickness of the hoop strip 12 from the longitudinal portion 11 so as to take a cross-sectional width 14 which can be dimensioned approximately twice as large as the initial width 13 of the hoop strip 12.

In this method of embossing, the tooth notches 15 of the fine toothing 5 are simultaneously formed in the form of recessed compression marks on the reduced material thickness 11, and further in such a way that the brush surfaces of the teeth 16 20 formed between two successive tooth notches 15 remain flat in reduced length 11.

.. - The tooth notches 15 formed by the interest stamping method then extend over the entire width 14 of the reduced length 11 of the thickness I, as shown in Figs. 25 defects 5 are clearly noticeable.

Immediately following the embossing process, the side wings 18 of the longitudinal portion 11 extending beyond the normal cross-section of the steel strip strip 12 on both sides are bent upwards by at least -: 30 almost 90 ° from the normal cross-sectional plane, so that both arms of the clutch shoe 3 are formed. as can be seen from Figure 6.

The upward bending of the side wings 18 then takes place expediently, so that the outer surfaces of both branches of the clutch shoe 3 will be at least almost flush with the narrow sides 19 of the steel strip 12 or the drive rod 2.

To bend the side wings 18 up into the arms 4 of the clutch shoe 3, a bending matrix 5 can be used, the end faces of which are substantially flat, but provided with a profile corresponding to the tooth notch 15 and teeth 16. Thus, by bending the side wings 18 up into the shoe 4 arms, the fine toothing 5 maintains an exact transverse -10 orientation with respect to the longitudinal axis of the drive rod. On the other hand, however, the areas of the teeth 16 in the area of the base or web 8 of the clutch shoe 3 are at least partially flattened so that their brush surfaces widen compared to the brush surfaces of the fine toothing 5, while the tooth notches in this area taper accordingly (Fig. 3).

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The bending tool for bending the side wings 18 up into the legs 4 of the clutch shoe 3 can be so constructed as to place the bottom of the clutch shoe 3 or the web 8 on the strip material strip 12 or the lower wide side of the drive rod 2 to bend upwards so as to at least equal the inner surface with the upper width side of the strip material strip 12 or the drive rod 2.

. Figures 5 and 6 show a very preferred method of manufacturing a single unit. on drive rods 2 formed with the clutch shoe 3.

25

Namely, the longitudinal part 11 flattened and widened by the heel stamping method is dimensioned in such a way as to allow two clutch shoes 3 to be formed simultaneously with the associated use rods 2, provided that half of the longitudinal part 11 has side * · * '· 30 wings 18 notches 20 , in the area of which the bent legs 4 of the clutch shoe are cut off. The knife switch 21 can then operate in this area, as shown in Fig. 7. After that shear stroke, two drive rods 2 are completed, each with a clutch shoe 3, ‘···’ which are in a mirror-like position relative to each other.

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The structure of the clutch shoe 3 in such a drive rod 2 is shown in Figures 2-4 of the drawing, all on an enlarged scale. In this case, it can be seen in particular that the total thickness 9 of the leg 4 and the base or web 8 in the clutch shoe 3 corresponds approximately to two thirds of the material thickness 10 of the drive rod 2. Finally, it can be seen from Figures 2 and 4 that the notch 13 of the fine tooth 5 has a depth and a height corresponding approximately to half the total thickness 9 of the leg 4 of the clutch shoe 3.

Finally, Fig. 3 also shows that by flattening the teeth 16 in the bottom of the clutch shoe 3 or in the web 8, their brush surfaces in each case form an enlarged support base for the insertable drive rod 6, whereby the tooth notches 15 between the teeth 16 are reduced.

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When relatively short bars, in particular drive bars, are required, they can also be formed transversely to their longitudinal width with their normal cross-sectional width before being subjected to the interest stamping method. The stamping presses used to make these short bars or drive rods 20 can then operate at a high stroke rate and thus allow for a cost. ,; low-cost mass production.

Claims (7)

9 Ί 7 6 8 3 A length-adjustable rod coupling, in particular for rod closures for windows, doors or the like, in which a U-shaped coupling shoe (3) is formed as a stamped and bent part of the two rods (2,6) to be connected to one end (2), which is provided with a finely formed toothing (5) formed on the inside of at least one of its branches (4), while the second rod (6) has a counter-toothing (7) extending over a large length over at least the narrow side 10 of the coupling, by means of which it can be inserted between the coupling shoes (4) and wherein the fine toothing (5) of the coupling shoe (3) formed in one piece with the rod (2) is made by embossing, characterized in that the cross section of the rod shoe (3) is reduced (9) in size (10) and increased (18) in width (13) that the fine toothing (5) extends in its profile (15,16) transversely to the thickness over the entire width of the reduced (9,10) drive rod portion (11), and that the side wings (18) of the reduced thickness (9,10) rod portion (11) projecting beyond the normal rod cross-sectional width (13) are bent up at least about 90 "rod level. 1 Claims Rod coupling according to Claim 1, characterized in that the total thickness of the rod part (11) of reduced thickness (9, 10) is about twice the height 25 of the profile of the fine teeth (5) and that the profile height of the fine teeth (5) is then about one third of normal rod cross section ( 10/13) of the thickness (10). Rod coupling according to one of Claims 1 and 2, characterized in that the unfolded width (14) of the rod part (11) of reduced thickness (9, 10) is at least about twice the width (13) of the normal rod cross-section. Bar coupling according to one of Claims 1 to 3, characterized in that the profile (16) of the fine teeth (5) is at least partially flattened with a web part (8) parallel to the normal bar cross section (10/13) of the coupling shoe (3). with. 10 -7683 Method for manufacturing a clutch shoe for a rod coupling according to one of Claims 1 to 4, characterized in that the tooth profile (16) of the fine toothing (5) is formed by flattening (9/14) the rod cross-section (10/13) and then flattening the cross-section. both side wings (18; Figures 5 and 2) of the seasonal area (9/14) are bent up from the plane of the rod. Method according to Claim 5, characterized in that the flattened bar cross-section (9/14) is moved parallel upwards so that its side surface with fine teeth (5) rises at least to the level of the associated wide side in a normal bar cross-section (10/13). Method according to one of Claims 5 and 6, characterized in that the starting material (12) is flattened (9, 14, 11) and provided with fine toothing (5) at a distance corresponding to twice the length of the clutch shoe (3) and then subjected to separation cutting. (5) halfway through the length (21; Fig. 7). 20 25 30 35 11 «7683