Device for joining consolidated lamellar material
This invention relates to a device for joining consolidated, stacked lamellar material, in particular drawings, wall-papers, fabric patterns and the like. 
     One prior art joining device includes a main body or sectional rail which is made by forming flat material to have a generally J-shaped cross section. The clamping member or rail of the device is made by forming flat material into an angle element having two legs of substantially equal length defining an acute angle in cross section. At its free end, one of these legs is adapted to be mounted on a pin for pivotal movement thereabout. This pin forms the cross member of a T-screw in which the vertical member is a threaded shaft which passes through a hole in the arcuate portion or web of the J-shaped sectional rail and is provided with a wing nut. When the device is assembled, one leg of the clamping rail is pivotally mounted between the legs of the J-shaped sectional rail so that the acute angle of the clamping rail opens towards the longer leg of the J-shaped sectional rail. As the wing nut is tightened, the end of the clamping rail is drawn towards the web. As a result, the shorter leg of the J-shaped sectional rail bears on the pivotally mounted leg of the clamping member so as to pivot the clamping rail and urge the other (free) leg toward the longer leg of the sectional rail. If a stack of lamellar material is placed between the longer leg of the sectional rail and the clamping member, it is clamped therebetween as the wing nut is tightened. 
     When the device is employed with a stack of consolidated material with the greatest possible thickness, the free leg of the clamp rail is most remote from the longer leg of the J-shaped sectional rail and is generally parallel thereto. The pivotally mounted end of the other leg of the clamp rail, however, is close to the inner edge of the shorter leg of the J-shaped sectional rail. The distance from the free longitudinal edge of the shorter leg to the pivotally mounted end is smallest in this case and, due to this short lever arm, the pivotal force or torque exerted on the clamp rail by the free longitudinal edge of the shorter leg of the section rail is only small as well. In order to enclose or join the sheets of a thick stack of consolidated material, a very great force must, therefore, be exerted in the case of the prior art device, which presupposes an appropriately strong operator. In addition, the pivotally mounted leg rubs on the free longitudinal edge of the shorter leg of the sectional rail, with this great force, so that there is, in addition, a significant amount of wear and the external appearance of the clamp rail is impaired or damaged. 
     It is a primary object of the invention to provide a device for enclosing or joining consolidated lamellar material which includes an adjustable device that is almost always effective with the largest and longest possible lever arm in order to enclose or join a stack of the largest possible thickness. 
     This object is accomplished in accordance with the invention in that an adjustable actuating device acts on the shorter leg of a clamp rail which has an L-shaped cross section with legs of unequal length. An external ridge-like projection, proximate to the apex of the L, is pivotally supported at the free longitudinal edge of the shorter leg of the sectional rail. 
     Due to this construction, the force exerted by the adjustable device, especially when enclosing a stack of maximum thickness, almost always acts perpendicularly to the shorter leg of the L-shaped clamp rail, so that the greatest possible pivotal force is always produced without excessive losses due to friction. Thus, the free longitudinal edge of the longer leg of the clamp rail is pressed against the stack to be closed or joined with the greatest possible force. In particular, no signs of wear which would impair the appearance, among other things, occur with a device designed in accordance with the invention. 
     The adjustable actuating device is preferably formed by at least one T-screw which is articulately anchored on the shorter leg of the clamp rail, passes through the web of the J-shaped sectional rail with clearance and has a manipulating member, similar to a wing nut, on the free threaded shaft projecting through the sectional rail. 
     Such an adjustable device which is known per se is simple in construction and accordingly economical in production. It, like the joining device itself, comprises only two parts which are assembled with effortless ease. 
     In detail, the construction is executed so that the shorter leg of the sectional rail, of J-shaped cross section, has a groove of circular cross-section adjacent its free longitudinal edge or in its side. This groove is adapted to receive the projection of the clamp rail of L-shaped cross section, the projection having approximately the same cross section as the groove and being designed to be insertable into the groove from the face end. 
     Owing to the projection provided on the clamp rail, about three-quarters of which projection corresponds to a round bar, the clamp rail is supported on the shorter leg of the J-shaped sectional rail free of twist and torsion and can not fall out of its position, unlike in the known device, when the adjustable device has not been assembled or mounted. The assembly of the adjustable device is thus simplified in this way. 
    
    
     The invention will now be explained in more detail with reference to a preferred, but nonetheless illustrative, embodiment which reveals other inventive features. In the drawing: 
     FIG. 1 shows a side cross-sectional view through the preferred device for joining consolidated lamellar material; 
     FIG. 2 shows a front elevational view, on a reduced scale, of the device according to FIG. 1; 
     FIG. 3 shows a bottom elevational view of a wing nut; 
     FIG. 4 shows a front elevational view, on a reduced scale, of a device similar to the one in FIG. 1 in which a plurality of clamp rails are provided on a common J-shaped sectional rail to permit simultaneous securement of different width materials; 
     FIG. 5 shows a fragmentary side elevational view of a device similar to the one in FIG. 1 which is adapted to be supported on a rail, and 
     FIG. 6 shows a fragmentary side elevational view of a device similar to the one in FIG. 1 which is adapted to be supported on a pair of parallel rails. 
    
    
     In one preferred embodiment (FIG. 1), the device for joining consolidated lamellar material, in particular drawings, wallpapers, fabric patterns and the like, is formed by a sectional rail 1 which is generally J-shaped in cross section and which may consist of aluminum, plastic or the like. Two legs 3 and 4 are formed on the web 2 of rail 1 and are of unequal length. The consolidated lamellar material 5 is pressed against the longer leg 3. The shorter leg 4 is designed to be considerably thicker than either the thickness of the web 2 or the longer leg 3. An open-edged cylindrical groove 6 is formed in the free narrow side of this thickened shorter leg 4 and has an opening which is substantially smaller than the diameter of the groove. It is arranged such that the opening extends somewhat laterally towards the longer leg 3 and, at the same time, extends somewhat toward the open bottom (FIG. 1) of the sectional rail 1. 
     An L-shaped clamp rail 8 having legs 9 and 10, which are of unequal length in cross-section, includes a ridge-like projection 7 with a cross-section which is approximately the same as the cross-section of the circular groove 6. Projection 7 is positioned in groove 6 and is formed externally adjacent the apex of the clamp rail 8, or on the longer leg 10 which projects somewhat beyond the shorter leg 9. The ridge-like projection 7, which is circular in cross-section, has a diameter which is considerably larger than the wall thickness of the clamp rail 8 and the opening in the circular groove 6 of the thicker leg 4 of the J-shaped sectional rail 1. Thus, the projection 7 of the clamp rail may be inserted only from the front or rear (in FIG. 1) of the sectional rail into the groove 6 of the shorter leg 4, in which groove the clamp rail 8 can then be pivoted similar to a hinge, to a limited extent. The free longitudinal edge 11 of the longer leg 10 is bent inwardly in a somewhat inclined manner to produce a clamping edge so that the consolidated lamellar material 5 to be joined can be held in position between the clamping edge (the bent longitudinal edge 11 of the clamp rail 8) and the longer leg 3 of the J-shaped sectional rail 1. The length of the shorter leg 9 of the clamp rail 8 is selected so that its free longitudinal edge cannot impede the hinge-like movement of said clamp rail. 
     In order to enclose the consolidated lamellar material 5 in the device, an adjustable device is provided which acts on the shorter leg 9 of the clamp rail, thereby pressing the clamping edge of the longer leg 10 against the consolidated material 5. In the preferred embodiment, the adjustable device comprises a tommy screw (T-screw) 12 whose head, formed for example by a cylindrical transverse pin 13, abuts the inner side of the shorter leg 9 of the clamp rail and whose shaft 14, the majority of which is provided with an external thread, passes through aligned holes in the shorter leg 9 and the web 2 of the U-shaped sectional rail 1. These holes are preferably transverse to the longitudinal axis of the leg 9 and the web 2, so that the T-screw 12 moves along its length when the clamp rail 8 is pivoted and thus cannot impede the pivotability thereof. A wing nut 15 is screwed onto the end of shaft 14 projecting from the web 2 of the J-shaped sectional rail 1 for manual operation of the T-screw in accordance with FIGS. 1 and 3. The wing nut 15 can have a cylindrical member on its underside in order to reduce the frictional surface on the web 2 of the J-shaped sectional rail. The adjustable device is preferably designed such that the wing nut 15 forms a hood to a certain extent and completely encloses the threaded shaft projecting from the web 2 when the clamping edge of leg 10 of the clamp rail 8 completely abuts the leg 3 of the J-shaped sectional rail 1. 
     The adjustable device can also be formed by a corresponding adapted eccentric mechanism instead of a screw mechanism to actuate the clamp rail. 
     In order that clamp each clamp rail can be opened rapidly in accordance with the movement of the adjustable device, a helical compression spring 12a is disposed on the shaft of each T-screw 12 and has one end on the web 2 of the sectional rail 1 of J-shaped cross section and the other end on the leg 9 of the clamp rail 8 so as to pre-bias them. 
     A plurality of stacks of consolidated lamellar material of different format and size can be joined in an orderly manner by means of the device similar to the one explained above, but modified in accordance with FIG. 4. A J-shaped sectional rail 17 is used for this purpose whose length corresponds approximately to the combined widths of the joined stack of different formats. Such a sectional rail includes a series of longitudinally spaced clamp rails 18, 19 and 20, which are constructed like clamp rail 8 described above. Each of the clamp rails is selected to have a width corresponding to the width of the format to be clamped thereby. The individual clamp rails are then joined to sectional rail 17 by corresponding ridge-like projections inserted into the conforming groove in sectional rail 17 having a similar construction to sectional rail 1. The adjustable actuating device associated with each clamp rail 18, 19 and 20 is then attached, whereupon the consolidated lamellar material corresponding to the respective format can be joined together by the associated clamp rail. 
     In order for the device designed in accordance with the invention to be assembled to form a ledger and still save considerable space (e.g., by accommodating it in a hanging file cabinet), the J-shaped sectional rail 1 or 17 is provided, when necessary, with suspension means 25 (FIG. 5), predominantly for pivotal suspended or hanging file cabinets which only require one support rail 23 for series of devices. Each individual device with the J-shaped profile rail extends horizontally along the support rail, but is also arranged perpendicular thereto. A laterally projecting suspension hook 27 (FIG. 6) can also be mounted adjacent the front ends of each device so that port rails 23,24 in order to form a series of devices. Alternatively, the J-shaped sectional rail 1 or 17 can also be extended beyond the width of the respective formats to be joined and open-edged notches 22 can be provided respectively in the longer legs of the extended ends as a mounting member for the support rails (shown in FIG. 2). 
     Instead of a cylindrical member on the underside of a wing nut 15, the web 2 of the J-shaped sectional rail 1 can be designed to be vaulted in cross section and in the direction of the wing nuts so that the wing nuts cannot become wedged on the vaulted portion 16 when the device is opened and closed. 
     Several modifications can be made in the construction of rail 1 or 17 to improve its operation. For example, the longer leg 3 of the J-shaped sectional rail 1 can project beyond the longer leg 10 of the clamp rail 8 and be beveled on the inner side towards the free longitudinal edge to ensure easier insertion of the consolidated lamellar material 5 to be joined into the device. Also, elevations, e.g. longitudinally extending ribs 21, can be provided on the inside of the broad leg 3 of the sectional rail 1. These elevations considerably improve the holding of the consolidated material. The thickening of the shorter leg 4 of the sectional rail can be restricted to the area of the groove 6 so that a considerable amount of material 4 can be saved as indicated by the dot-and-dash lines in FIG. 1. 
     Although specific embodiments of the invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that many additions, modifications and substitutions are possible without departing from the scope and spirit of the invention as defined in the accompanying claims.