DE3227363A1 - HOLM LEVEL CONNECTION WITH A LIGHT METAL LADDER - Google Patents

Abstract

1. Sidepiece-to-ring connections in the case of an alloy ladder consisting of two parallel side pieces (10) (30) (50) at a distance from each other, of which each is of U-section and the open sides of the U-section face each other, together with steps (1) (20) (40) of which each likewise consists of a U-section, whose base forms the tread of the step, in which the section (profile) of the step in each case engages in the U-section of the side-piece and is connected to the side-piece in the overlap area by a slotted type of connection, characterized as : that the connection between side-piece (10) (30) (50) and step (1) (20) (40) consists of a snap in, slotted connection with lugs (19) (24) ; (31) (32) (33) ; (34) (35) on the sidepieces (10) (30) (50) which extend into recesses (3) (4) (11) in the form of holes in the side legs (2) (8) of the step (1) (20) (40) and snap-in by elastic deformation of the side legs, and which after the locking-in into the recesses (3) (4) (11) of the side-pieces (10) (30) (50) are compressed, and the recesses (3) (4) (11) form one-sided overlapping locking heads.

Description

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Stile-step connection for a light metal ladder

The invention relates to a stile step connection with a light metal ladder according to the preamble of claim 1.

In the case of the known spar-step connection mentioned at the beginning, the connection between the spar and the step is produced by riveting in the connection area between the stile and the step. The disadvantage of this riveted connection is that through Attaching the rivet holes the load-bearing spar cross-section is weakened and that the production of this rivet connection is relatively costly and laborious to assemble. You need your own rivet feeding machines to get the rivets To make the connection to the assembly point.

The invention has set itself the task of a HoIm stage connection of the type mentioned so that they are easier to manufacture and in terms of the strength is improved.

To solve the problem, the invention is characterized in that the connection between Stile and step from a locking connection with in There is recesses of the step latched tabs of the spar.

The feature of the invention is that the spar has opposing legs on the inside, which are punched out in the area of the steps so that rags remain. In the area of this lobe the steps have slots into which the stile engages with its tabs. As additional support

- ^ -i ^ r> 4- r -.-! - r, ^ nn + - »r- ~ T ^ _n + -, =, _{ain the} bottom of the recess

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in the web area of the spar.

The assembly is done by a simple pivotal movement of the tread against the Holm.Dabei is the foothold ι bent in the elastic range, and then springs back to its original shape after latching.

With this simple locking connection is the required rivetless connection between the stile and the step manufactured.

In order to ensure additional operational safety, it is preferred according to the subject matter of claim 2, if the lobes of the spar after unicycling in the Recesses are pressed and the recesses form locking heads that overlap on one side. It will that is, the tabs are riveted after they have clicked into place, without the need for separate rivets.

The advantages of the current connection are to be stated as follows: j

a) The spar and the rivet pin (tab) are made of one piece. This creates the necessary play between the spar

and rivet used in prior art joints is present, switched off. I.

b) The spar is not weakened by rivet holes.

c) The ribs act as bracing between the steps.

d) There is no need to feed the rivets during assembly.

According to the subject matter of claim 3, a particularly simple shape is achieved in that the spar from there is a mirror-symmetrical profile with respect to the longitudinal center axis, on the inner sides of which the legs are against one another directed, longitudinal ribs are formed, from the material of which the divided by recesses Tabs are formed. The spar is thus made, for example, from an extruded aluminum profile and the ribs formed on the inside of the legs are consequently made of one piece of material with the rest of the profile of the spar. A simple punching process divides the tabs into the corresponding recesses engage the step, the step having parallel, angled legs in which Surfaces the recesses are arranged.

Further features of the invention are the subject of claims 4 and 5.

The subject matter of the present invention results not only from the subject matter of the individual patent claims, but also from the combination of the individual ones Claims among themselves.

All information and characteristics disclosed in the documents, in particular the spatial configuration shown in the drawings are claimed as being essential to the invention, insofar as they are new to the state of the art, individually or in combination.

In the following, the invention is explained in more detail with reference to drawings showing several possible embodiments. Further features and advantages of the invention which are essential to the invention can be derived from the drawings and their description Invention.

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Show it:

Figure 1: Top view of the inside of a spar with

Stepped step in it in non-linked state;

FIG. 2: Section through the step at the level of the recesses ;

FIG. 3: Front view of the step in the direction of arrow III in FIG. 2;

FIG. 4: Interior view of the step in the direction of arrow IV in FIG. 2;

FIG. 5: top view of the step in the direction of arrow V in FIG. 2;

FIG. 6: front view of a spar;

FIG. 7: interior view of the spar in the direction of arrow VIII in FIG. 6;

Figure 8: Section through the center of the tabs in one

Plane parallel to the outside of the spar with non-riveted pins, according to a second embodiment;

FIG. 9: the same representation as FIG. 8 with riveted pins;

FIG. 10: the same section as FIG. 8 for a third Embodiment with non-riveted tabs;

FIG. 11: the same representation as FIG. 10 with riveted tabs;

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Figure 12: Section through the tabs in riveted -and unriveted execution parallel to the level of the step in the embodiment according to Figure 10 and Figure 11.

According to Figure 1, 6 and 7, the spar 10 consists of a U-extruded profile with an outwardly directed Holm wall 18, and side legs 12, 13, on the inner sides of which are opposite one another, Ribs 14, 15 directed towards one another are integrally formed. The legs 12,13 are down through webs 16,17 thickened cross-section continued.

According to FIG. 1 and FIG. 7, tabs 19, 24 are provided in the area of the ribs 14, 15, which are opposite one another, and through recesses 21, 22 (tabs 19) or through recesses 25, 26 made of the material of Ribs 14,15 are divided. The lobes 19, 24 are located diagonally opposite one another, the inclination results from the fact that according to Figure 1, the spar 10 itself is directed obliquely, so that thereby the tread level (Step 6) of the step 1 to be attached later is aligned horizontally.

At the bottom of the recess 21, the edge of the rib 14 is not straight, but has an undercut 23, in which the thickened web 5 of the step 1 in the locked state according to FIG 1 clicks into place.

Likewise, the edges of the recesses 22, 26 can be beveled, as is the case with the example of the inclined surface 27 is shown at the bottom of the recess 26 in FIG.

oil I

According to FIGS. 2-5, the step 1 also consists of a U-shaped extruded profile, preferably made of an aluminum material, just like the spar. The base leg is formed by the step surface 6, while the side legs 2.8 are formed by mutually parallel, inclined surfaces. The thigh

2 is continued at its free, lower end by a thickened cross-section, while the leg 8 has an inwardly directed bend 9 at its lower, free end.

In the area of the leg 2 there are two slot-shaped recesses that are aligned with one another and, according to the figure, superimposed on one another 3, 4 are provided, while a slot-shaped recess 11 is provided in the leg 8.

According to Figure 4 and Figure 5, the upper recess settles

3 still partially continues into the material of the step surface 6 of the step 1.

FIG. 1 shows the locking connection between ^{1 of} the step 1 and the spar 10 in the locked state, as well as in dashed lines shortly before reaching the locking position.

To establish the latching connection, the step 1 with its recess 11 is placed on the tab 24 of the spar 10 put on and pressed on. As a result, the leg 8 is elastically deformed inwards. Step 1 'will be then pivoted upward in the direction of arrow 28, so that on the one hand the tab 36 (FIG. 7) into the recess 3 engages and on the other hand the tab 19 in the recess

4 in leg 2 of step 1. It takes place through this an elastic snap, because the leg 2 after the inward bend has taken place, it is non-positively applied to the inside of the spar 10 in the area of the rib 14, whereby the Einrastverbxndung is further improved

can be that the web 5 on the leg 2 of the step 1 engages behind the undercut 23 of the rib 14.

In order to facilitate the placement of the leg 8 on the tab 24 when the step 1 'is not engaged, is the previously described inclined surface 27 is arranged in the region of the rib 15 on the inside of the spar 10.

Characterized in that the recess 3 in the area of the leg 2 is still in the step profile 7 of the step surface 6 of the Continuing step 1, the result is a particularly heavy-duty connection, so that in and of itself this snap-in connection is sufficient to connect the step 1 to the spar 10 in an operationally reliable manner.

In a subsequent operation, the tabs 19, 24 can then be processed with an upsetting tool be, so that there is a closing head which extends beyond the recesses 3, 4, 11 also, so that the tabs 19, 24 also addressed as rivets integrally connected to the profile of the spar can be.

Figure 8 shows a second embodiment of a connection between a spar 3 0 and a Step 20. Instead of one longer tab 24 according to FIG. 1, there are two spaced apart from one another Tabs 31, 32 are provided which engage in correspondingly assigned recesses in the area of the step 20. The latching takes place in the direction of arrow 29. A tab 33 is provided on the opposite side, which engages in the associated recess 2, while in the same way - as in Figure 1 - a recess 3 is present in the area of the step 20, which is inserted into a corresponding tab 36 of the stile 3 0

engages, the tab 36 being formed by the profile of the rib 14.

FIG. 9 shows the riveted tabs 31 ', 32', 33 '.

Figures 10-12 show a third embodiment, it can be seen that the one tab 33 "I according to the embodiment of Figure 8 by two at a distance from one another parallel tabs 34,35 is replaced, while the tab 24 according to the exemplary embodiment according to Figures 1-7 was retained.

The locking connection there between the step 4o and the spar 5o still has the special feature that instead of the tab 36, which is formed in one piece from the material of the web 14, the second tab 34 is present, and that a recess 3 extending into the step profile 7 of the step is missing, and instead there is a recess provided only in the area of the leg of the step 4o.

FIG. 11 shows the riveted tabs 24 ', 34 ", 35'.

For better clarity, FIG. 12 shows a section through the spar 50 in a plane parallel to. Step surface 6 of the step 40, whereby the tabs 34, 24 * were cut through.

Claims (1)

DR.-ING. G. RiEBLING DR.-ING. P. RIEBLING Dipl.-lng., Ing. (Grad.) Dipl.-lng. Authorized representative at the European Patent Office Professional Representatives before European Patent Off ice Mandataires agrees pres! 'Office european des brevets My sign H 1904-31ku Please repeat in the answer L J " Your reference · Your message from D-8990 Lindau (Bodensee) Rennerle 10 - P.O. Box 3160 5th July 1982 Subject Applicant: Company Hymer Leichtmetallbau, P.O. Box 138, 7988 Wangen / Allgäu Claims 1. Stile-step connection for a light metal ladder, consisting of two parallel and spaced bars, each of which consists of a U-profile and the open U-profile sides are facing each other, as well as steps, each of which also consists of a U-profile exists, the base leg of which is the tread surface of the step forms, wherein the profile of the step engages in the U-profile of the spars at the end and in the Overlap area is connected to the spar, characterized in that the Connection between the spar (10,30,50) and step (1,20,40) from a locking connection with recesses (3, 4, 11) of the step (1, 20, 40) latched tabs (19.24; 31.32.33; 34.35) of the spar (10.30.50). 2. spar step connection according to claim 1, characterized characterized in that the tabs (19,24; 31,32,33; 34,35) after snapping into the recesses (3, 4, 11) of the spar (10, 30, 50) are pressed, and the recesses (3, 4, 11) one-sided overlapping locking OCCI ΟΌΟ forming heads. 3. spar step connection according to claim 1 or 2, characterized in that the Spar (10, 30, 50) consists of a profile that is mirror-symmetrical with respect to the longitudinal center axis, on its inner sides the legs (12, 13) directed against one another, longitudinally extending ribs (14, 15) are formed from the material thereof the tabs (19.24; 31,32,33; 34,35) divided by recesses (21,22; 25,26) are formed (Fig. 6,7), and that the step (1,20,40) has parallel, angled legs (2,8) in their surfaces the recesses (3, 4, 11) are arranged (Fig. 2-5). 4. spar step connection according to claim 3, characterized in that at least one The free end of the leg (2.8) of the step (1, 2o, 40) is a longitudinal web with a thickened cross-section (5) is arranged, which is in the locked state the step (1,20,40) in the stile (10,30,50) on the bottom the recess (21) of the rib (14) on the end face this rib (14) is supported on an undercut (.2 3) (Fig. 1, Fig. 7). 5. HoIm stage compound according to one of the claims 1-4, characterized in that in one leg (2) of the step (1,20,40) two aligned with respect to a perpendicular to the longitudinal center axis ^ de and spaced apart recesses (3, 4) are arranged, one of which is a recess (3) extends both in the area of the leg (2) and in the area of the tread surface (6) (Fig. 4,5).