DE147781C

DE147781C -

Info

Publication number: DE147781C
Application number: DENDAT147781D
Authority: DE

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

Vorliegende Erfindung betrifft einen Rahmen mit beweglichen Traversen zum Strecken und Aufspannen von ganzen Häuten und Kernstücken, bei welchem der Streckzug durch besondere,' an den verschiebbaren Traversen angreifende Federn behufs Erzielung' einer auf alle Teile der Bahn entsprechend ihrem Dehnungsvermögen wirksamen Anspannung und selbsttätigen Nachspannung geäußert wird.The present invention relates to a frame with movable cross members for stretching and Clamping of whole skins and core pieces, in which the stretching by special, 'on the movable traverses attacking springs for the purpose of obtaining one on all parts of the path according to their Extensibility, effective tension and automatic post-tensioning is expressed.

ίο Die bisherigen bekannten Vorrichtungen zum Strecken von ganzen Häuten und Kernstücken werden von einer oder zwei Schraubenspindeln in gleichem Maße gespannt und können daher die den einzelnen Teilen der Haut oder Bahn zukommende, unterschiedliche Dehnungsfälligkeit nicht berücksichtigen. Auch fehlt eine Vorrichtung, die selbsttätig die durch die dauernde Belastung entstehende nachträgliche Faserverlängerung nachspannt.ίο The previously known devices for Stretching of whole skins and core pieces are made by one or two screw spindles stretched to the same extent and can therefore be different for the individual parts of the skin or web Do not consider elongation. There is also no device that works automatically the subsequent fiber lengthening resulting from the permanent load is retightened.

Der diesen Übelständen abhelfende Streckrahmen gemäß vorliegender Erfindung ist auf den beiliegenden Zeichnungen (Draufsicht)The stretching frame according to the present invention which remedies these inconveniences is on the enclosed drawings (top view)

, dargestellt, und zwar in Fig. 1 in einer Ausführungsform mit Federungsvorrichtung an jedem Rahmenende und in Fig. 2 in einer vereinfachten Anordnung. Die Bestandteile des Rahmens sind als aus Stahlrohr gebildet angenommen., shown, namely in Fig. 1 in one embodiment with suspension device at each end of the frame and in Fig. 2 in a simplified arrangement. The parts of the frame are assumed to be made of tubular steel.

Der eigentliche feste, an drei Seiten geschlossene Rahmen umfaßt gemäß Fig. 2 drei starr miteinander verbundene Rahmenstücke, nämlich die beiden Wangenstücke oder Schenkel α b und das Endstück c. Zwei oder mehrere ebenfalls fest angebrachte, unter Umständen übrigens verstellbar befestigte Traversen s s bilden zusammen mit einem Mittelrohr r eine zweckmäßige innere Versteifung des Rahmens, so daß er bei Belastung dem Verbiegen nicht ausgesetzt ist. Zwei bewegliche Traversen d und e sind an dem Rahmen (Fig. 1), die eine an dessen einem Ende und die andere an dem gegenüberliegenden Rahmenende als Endtraverse, angeordnet; die Beweglichkeit dieser Traversen ist durch Gleitung an den bezügliche Führungen bildenden Schenkelrohren a b nebst Mittelrohr r in der Längsrichtung des Rahmens ermöglicht. Ferner ist eine ebenso verschiebbare, dreigliedrige Traverse ρ (mit gelenkigem Zwischenteil q) im Rahmen angeordnet, und zwar der Endtraverse e innerhalb vorgelagert, und diese Traverse ρ bildet mit der gegenüberliegenden Traverse d das den Streckzug übertragende Paar von Spanngliedern. Mit den Endtraversen c und e sind die Traversen d und ρ durch Federn f verbunden. Die Endtraverse e kann, wenn sie beim Strecken auswärts um das Streckmaß verschoben worden ist, mittels Stellringe uvw in ihrer Lage festgehalten werden.The actual solid frame, which is closed on three sides, comprises, as shown in FIG. 2, three frame pieces rigidly connected to one another, namely the two cheek pieces or legs α b and the end piece c. Two or more also firmly attached, possibly also adjustably attached traverses ss together with a central tube r form an appropriate inner stiffening of the frame, so that it is not subject to bending under load. Two movable traverses d and e are arranged on the frame (FIG. 1), one at one end and the other at the opposite end of the frame as an end traverse; the mobility of these traverses is made possible by sliding on the leg tubes forming the relative guides , together with the central tube r, in the longitudinal direction of the frame. Furthermore, an equally displaceable, three-part traverse ρ (with an articulated intermediate part q) is arranged in the frame, namely in front of the end traverse e within, and this traverse ρ forms with the opposite traverse d the pair of tendons transmitting the tensile force. With the end trusses c and e , the traverses d and ρ are connected by springs f . The end traverse e, if it has been moved outwards by the stretching dimension while stretching, can be held in its position by means of adjusting rings and much more.

Das Kernstück Leder oder die Haut h wird nun in einer der bekannten Weisen durch Verschnüren oder Klemmschrauben bis auf den mittleren Teil (Rückstrang) in dem Rahmen mit zu den Schenkeln α und b sowie den Spanntraversen d und ρ sich erstreckenden Verbindungen befestigt. Der mittlere Teil wird hingegen —. im AbstandeThe core piece of leather or the skin h is now fastened in one of the known ways by lacing or clamping screws up to the middle part (back line) in the frame with connections extending to the legs α and b and the tensioning cross members d and ρ. The middle part, however, will be -. at a distance

Claims

from about ίο to 20 cm - on each side of the return line center line - of resilient intermediate links, consisting of two springs according to the drawing, and taken by means of the same with the associated tensioning cross member d respectively. ρ connected; the spring ends are attached to the articulated intermediate part q of the latter. These springs \% are weaker than the springs f connected between c d and ρ e and are chosen so that they correspond to the difference in elongation of the middle part of the skin of the back cord, which is known to have the lowest extensibility, in relation to the other parts. The flexibility is supported by the articulated composition of the tensioning traverse ρ. The traverse e is now attracted by any of the known devices and thereby expands the entire core piece h. As soon as the elastic limit of the middle part of the skin showing the least stretch is reached, the feathers give way and allow the other parts of the skin to stretch out further. Their expansion is continued until the required load is reached, and the springs ff, the strength of which is selected accordingly, are now also in tension. The adjusting rings 11 ν Jf are finally attached, and after the tensioning has been effected in this way, the frame with the skin can be put away to dry. The stretching of the leather fibers caused by the tension is immediately canceled by the springs, so that the leather dries under constant load; an automatic retensioning is thus achieved. The embodiment according to FIG. 2 is simplified compared to that according to FIG. 1 in that the cross member d with the suspension aids ff ^ J is omitted from the end cross member c. Accordingly, one end of the skin or the leather core is here directly connected to the end crossbeam c, without allowing flexibility, and only the resilience comes into effect through the auxiliary means in connection with the tensioning crossbeam ρ. Obviously, the equalization of the tensions by means of the springs f and \ in this case has essentially the same result as when the frame is set up with a suspension device at each end. Godfather ν ϊ-Α ν Proverbs:

1. Frame with movable traverses for stretching whole hides and leather core pieces, characterized in that a tensioning traverse influenced by springs (f) grips the parts of the skin which have less elongation by means of special interposed springs (\) which are weaker than the the former springs ff), for the purpose of enabling tension and automatic re-tensioning effective on all parts of the web in accordance with the different extensibility.

2. Embodiment of the stretching frame according to claim 1, characterized in that the tensioning traverse (p) is in several parts and has an articulated intermediate piece (q) on which the weaker springs (\) can attack.

1 sheet of drawings.