DE3345232C1 - Shield-type or chock-type support - Google Patents

Abstract

To stabilise a shield-type or chock-type support and to maintain a uniform distance between the front edge of the cap and the working face over a certain height range, it is known to provide a four-bar mechanism between the floor structures and the roof caps. In this arrangement, however, the coupling links of these mechanisms are of relatively long construction, so that the roof caps also become longer, the roof area to be supported becomes larger and the props have to be of larger proportions. The invention now makes provision for a coupling link 11 to be connected to both a floor structure 1 and a roof cap 20 of a shield-type or chock-type support 2 in each case via two guide links 4, 5 and 15, 16 respectively. This arrangement leads to a shorter coupling link 11 and thus to a shorter roof cap 20, a smaller roof area as well as less generously proportioned props. But the guide links 15, 16 on the roof side can also be coupled to a pivot crosspiece which in turn is fastened to the roof cap 20 in an articulated manner. The roof cap 20 can then be set or lowered independently of the mechanism 4, 5, 11, 15, 16. <IMAGE>

Description

The invention relates to a shield or trestle construction with a stamp arrangement and a four-joint gear arrangement between the sole construction and the hanging cap according to the features in the preamble of claim 1.

The inclusion of a four-joint gear arrangement (lemniscate link arrangement) between the The base construction and the hanging end cap of a shield or trestle construction serve, in addition to stabilization, for the most part the purpose of moving the leading edge of the cap largely vertically over a certain height range to be able to. The four-joint gear arrangement comprises two link arms and a coupling arm. These link arms are on the one hand on the sole construction and on the other hand at one end of the coupling arm hinged. The other end of the coupling arm is directly connected to the hanging end cap articulated. In most cases, the coupling arm also forms a shield-like shield opposite the offset space. Depending on the design of the shield or trestle structure, several four-joint gear arrangements can be used be provided side by side. This can then be used to split the sole construction and / or the coupling rocker and / or the hanging end cap to lead.

For mastering an extension height range that is satisfactory in practice with a single extension type So far, a relatively long coupling arm has been used. But it has this long coupling arm that in the retracted state of the shield or trestle expansion the four-joint gear arrangement in Seen in the longitudinal direction of the shield or trestle construction, builds relatively long. In order to still have a sufficient Ensure track next to the extraction and conveying device, which is also to be projected overhead, results as a result, a long hanging cap. However, a long hanging cap means a large one to be supported Hang-end surface, for which purpose large-sized stamps are to be used.

DE-AS 29 02 225 and DE-OS 30 04 266 disclose expansion frames, each of which has two of each two link arms and a coupling arm existing four-joint gears between the base constructions and the hanging end caps are arranged. While in the design of DE-AS 29 02 225 the Link arm swing of the four-joint gearbox from its articulation points on the base structure or the The hanging end cap extends obliquely to the rear towards the offset, are the link arms of the four-joint gear the type of DE-OS 30 04 266 of their articulation points on the sole construction or on the The hanging cap is directed at an angle to the working face.

In the middle height range of the known support frames, the free ends of the coupling rocker are articulated connected with each other. As a result, both four-joint gear assemblies are mirror images Constructions, based on a horizontal plane running through the pivot point of the coupling arms.

A deficiency of such four-jointed transmission is the fact that the arrangement of two Coupling swing a comparatively high cost of materials is required. So although more material is incorporated into the gear arrangement, this is not associated with any higher stability. On the contrary, the use of two coupling arms in connection with the need for the coupling arms Having to attach to one another in an articulated manner leads to an additional articulation point. These additional Articulation points make the known overall systems unstable, unless they are constructive Measures ensure that the hinge points are sufficiently rigid. Since the However, the points of articulation are the distinctive connection points between the base structure and the hanging end caps represent and in particular relative movements of the hanging end caps to the sole constructions vertical axes of rotation must be absorbed in the horizontal planes, is the design of the points of articulation with associated extremely complex design considerations. Also is in this context to note that the design problems of the hinge points for the purpose of adaptation to the special underground The farther the hanging end caps from the base structure, the more the situation increases are removed and thus the lever arms between the sole structures on the one hand and the hanging end caps on the other hand, and the joints become longer. In these cases, even small amounts add up Play in the other points of articulation to large games in the points of articulation, with the result that the through the four-joint gear arrangement only ensures the desired stability of the support frames can be, if a special design effort for the design of the points of articulation between the two four-joint gear arrangements

3 4

will practice. At the other end 14 of the coupling rocker 11 are in

On the basis of the opposite arrangement in the preamble of claim 1 to the handlebars on the sole side Design of a shield or trestle extension also swing 4.5 two straight handlebars The invention is based on the object of having their stabilizers 15, 16 articulated, the other ends 17, 18 of which are attached did to increase with reduced structural effort. 5 of the embodiment of FIG. 1 and 2 to a console This object is posted according to the invention by the 19, which are of a hanging cap in the characterizing part of claim 1 listed 20 protrudes towards the sole construction 1. Solved at the execution characteristics. 3 are the link arms 15, 16

In contrast to the known types of construction, a pivoting cross-member 26 avoids being hung up, which in turn avoids the invention of the extremely problematic joint 10 at the pivot point 27 at a point in the middle height range with the hanging cap 20 in that all the console 25 connected to the pivot is pivotably attached. Kerschwingen to a jointly undivided coupling The handlebars 15,16 are also hinged rear swinging. In this way, the other is securely arranged, with the short link arm 16 only one - in the longitudinal direction of a shield or trestle - mining joint side of the long link arm 15, seen from expansion - relatively short gear arrangement ts The distance c of the articulation points 21, 22 of the handlebar reaches, but also achieves the advantage that relative oscillations 15, 16 on the coupling rocker 11 are movements of the hanging cap to the base structure, twice as large as the distance between the articulation points 23, in particular movements around a vertical 24 of the link arms 15, 16 on the console 19 or axis, can be properly accommodated by the gear mechanism according to the invention, the articulation points 29, 28 on the pivoting cross member 26. arrangement. In addition to the increased cost of materials for only a short one of the bracket 19, the pivot point 23 of the long link arm 15 is lower than the pivot point 24 of the coupling arm in comparison to two coupling arms also the advantage of the form of FIG. 3 is the articulation point 29 of the long achieved that the design effort is significantly reduced link arm 15 on the pivoting cross member 26 is lower than. In addition, the linkage point 28 of the short link arm 16. In the exemplary embodiments, all link arms are a further shortening of the transmission armature arms 4, 5 and 15, 16 and the coupling arm Order in comparison to the known types of construction is more straight. They can also be curved or tied. Opposite here means that the to be cranked.

It is also conceivable that on the sole construction 1 from their points of articulation in and / or on the hanging end cap 20 and / or on the Direction to the offset and the handlebars on the hanging end cap 4, 5; 15, 16 and / or link arms of their articulated rocker 11, which are attached to the coupling, in the drawings extend out to the working face. clear stops for mutual swiveling

If the features of claim 2 can be provided for application 35 limitation.

the hanging end cap can be turned on or off.

be lowered without being caused by such pivoting movements. For this purpose 3 sheets of drawings

The function of the gear assembly is disadvantageous
being affected.

An advantageous further development of the 40
The basic idea is characterized in the features of claim 3.

The invention is illustrated below with reference to in
Drawings illustrated embodiments explained in more detail. It shows 45

F i g. 1 in the scheme of a trestle extension in the retracted state in the side view;

F i g. 2 the trestle construction of FIG. 1 in the extended
Condition and

F i g. 3 another embodiment of a trestle 50
construction in the extended state.

With 1 in Figs. 1 to 3, the one-part or multi-part
Base construction of a trestle extension 2 designated. the
Sole construction 1 has a console-like elevation
3, to which two straight link arms 4, 5 in 55
the pivot points 6,7 are attached at a distance a from each other. The handlebars 4.5 are different
long trained. The long link arm 5 is attached to the working joint side of the short link arm 4 in the articulation point 6, which is also higher than the articulation 60
point 7 of the short handlebar 4.

The end sections 8.9 of the link arms 4.5 are
hinged at one end 10 of a straight coupling arm 11 in an articulated manner. The articulation points 12, 13 of the link arms 4, 5 on the coupling arm 11 are 65
at a distance b from each other, which is about twice
is as large as the distance a of the articulation points 6.7
Link arms 4.5 on the sole construction 1.

- blank page -

Claims (3)

Patent claims: 1. Shield or trestle construction with a stamp arrangement and a four-joint gear arrangement between the sole construction and the hanging cap, one on the sole construction and one at least indirectly attached to the hanging cap, each of two arranged one behind the other, different long handlebar arm pair and one between the handlebar arm pairs has integrated coupling rocker, with the long link arm on the sole side the short link arm is arranged on the working face side, characterized in that that all handlebars (4,5; 15,16) to one common coupling rocker (11) are articulated, with the link arms being assigned with the same opposite assignment (4,5; 15,16) the long handlebar rocker on the slope end (15) on the offset side of the short handlebar rocker (16) is located. 2. shield or trestle construction according to claim 1, characterized in that the handlebars on the slope end side (15,16) are articulated to a pivoting cross member (26), which in turn via a joint (27) with to the joint axes between the link arms (4,5; 15,16) and the coupling arm (11) on the one hand or the sole construction (1) on the other hand parallel joint axis on the hanging end cap (20) is attached. 3. shield or trestle construction according to claim 1 or 2, characterized in that on the base structure (1) and / or on the hanging end cap (20) and / or on the handlebars (4,5; 15,16) and / or stops are provided on the coupling rocker arm (11) to limit mutual swiveling.