Abstract:
The invention pertains to a railing fastener for drawers that has one part with an expansion dowel located in the front panel of the drawer and one part that is a fastener (that can be inserted), which is connected in the dowel to the railing pipe. The fastener fitting has a head component with an expansion head that can be inserted in the expansion dowel. Guides and/or catches are provided on the head component, respectively the expansion head, that work together with the corresponding grooves or catch openings of the expansion dowel. After completely inserting the expansion head, the expansion dowel spreads, activated by the swinging or swiveling of the fastener fitting; the guides or catches reach the corresponding lock-in positions so that the fastener fitting is held securely in the expansion dowel and an extraction of the expansion head is no longer possible.

Description:
BACKGROUND OF THE INVENTION 
     This invention pertains to a railing fastener for a drawer according to the characterizing concepts of the independent patent claims. 
     A simple type of the railing fastener is made known by the registered patent DE 29507322. This fastener consists of a bracing (7), which is anchored in the drawer&#39;s front panel. Furthermore, an adjustment component, which is fastened to the railing pipe, is provided. The adjustment component, which can be inserted into the bracing, allows a longitudinal adjustment of the railing. 
     A further development is made known by the registered patent DE 295 18 690. Here an expansion dowel, anchored in the cabinet/furniture fitting by means of a suitable expansion component, is located in the drawer&#39;s front panel. By inserting the expansion component and tilting the whole fastening system, the expansion component is moved axially in the expansion dowel so that the dowel expands and anchors firmly in the front panel. 
     The U.S. Pat. No. 5,690,450 makes known a fastening system for fastening a railing with a drawer back wall so that the railing&#39;s end is connected with a fastening component. A corresponding fastening component in the drawer back wall has an open slot aperture in which the fastening component can be hanged. Furthermore, the fastening component has a catch hook, which engages behind an edge of the backside of the component and, thus, secures the connection. 
     The object of the present invention is based on the task of further developing and improving a drawer&#39;s railing fastener with regard to the ease of assembly, space required and the fastener&#39;s assembly and load capacity. 
     SUMMARY OF THE INVENTION 
     The present task is solved by the identifying characteristics of the independent patent claims. 
     A first embodiment of the invention distinguishes itself by the head component with an expansion head, which can be inserted in the expansion dowel. The expansion head has guiding ribs, which guide the expansion head into the corresponding expansion dowel&#39;s guiding grooves. After the expansion head is fully inserted, swiveling or swinging the head component causes the expansion or spreading of the expansion dowel so that the guiding ribs disengage with the guiding grooves and the expansion head is securely fixed (from being pulled out). 
     Another development of this embodiment shows the expansion head with a lever piece that, when tilted, has a counter-pressure-acting shoulder, which engages in a corresponding notch of the expansion dowel. 
     The expansion dowel has an elongated opening to guide the insertion of the expansion head; the guiding grooves are located within a sub-section of the expansion dowel&#39;s elongated opening. The guiding grooves don&#39;t extend over the entire length of the expansion dowel so that, after the head component has been inserted, it can be swiveled. 
     Furthermore, it is provided that in the expansion dowel there is an edge, which is axially directed towards the insertion opening. This edge, which lies on a shoulder of the inserted expansion head, provides additional protection against axial extraction. 
     Preferably, the head component has a coupling in which a corresponding counterpart of an intermediate piece can be hanged. A railing pipe is fastened to the intermediate pipe. 
     A second embodiment of the invention distinguishes itself by the fastener fitting that has a head component with an expansion head, which can be inserted into the expansion dowel. The expansion head has at least one catch shoulder at its rear end that, after a complete insertion of the expansion head in the expansion dowel, reaches with its catch shoulders in the expansion dowel&#39;s catch notches in the respective first lock-in position. By swinging the expansion head, the expansion dowel spreads and the catch shoulders go into the respective expansion dowel&#39;s catch notches, bringing about the second lock-in position. This secures the expansion head from extraction, preventing it from being pulled out. 
     Another axial securing of the expansion head is reached by at least one outwardly directed anchoring projection that is located radial on the expansion head. 
     In order to make the swinging or swiveling of the head component easier, the head component has two opposite-located radial outwardly directed bearing shoulders, which engage, after the complete insertion of the head component in the corresponding bearing notch, along an axis defined by the bearing shoulders. 
     The spreading of the expansion dowel is not caused by the head component, but by an expansion wedge in front of the head component. The expansion dowel has a somewhat V-shaped elongated opening that fits across the expansion wedge so that when the head component swivels, the expansion component moves across to the elongated opening and presses on the inner surface of the expansion dowel so that it spreads or expands outwardly. 
     A third embodiment of the invention shows a fastening component that has a hook extension that can be hanged in the corresponding opening of the drawer&#39;s back wall, which has an opposite-acting detent pawl on the hook extension, which keeps the hook extension from unhooking and so prevents the fastening component of the back wall from coming undone. 
     The detent pawl is, preferably, formed as a springy tab, whose locking action can be lifted up manually or with an appropriate tool. The detent pawl supports itself with it at the inside edge of the engagement opening. 
     Preferably, the railing pipe can be inserted in a corresponding opening of the fastening component and can be locked there by the railing pipe that has a tab on its outer perimeter, whose free end points in the direction of the railing pipe end. A catch shoulder, which presses the tabs radial and inward with the insertion of the railing pipe, causes the railing pipe to catch within the opening. 
     An essential advantage of the invention is the tool-free quick assembly of the railing fastener, as well as of the front panel and back wall. The described fastening device requires very little space and secures the railing against tension and pressure loads. 
     Another advantage is that the swing-in direction of the front fastener proceeds level with the back wall fastener, so that both fasteners can be fixed with a swinging or swiveling motion. 
     Subsequently, several variation examples of the invention at hand shown by respective drawing figures are expounded on in more detail. Further characteristics, features and advantages of the invention follow from the drawings and their descriptions. 
    
    
     BRIEF DESCRIPTION OF THE FIGURES 
     FIG. 1. A lateral, perspective view of the railing fastener; 
     FIG. 2. A longitudinal section through the front panel and the railing fastener in the assembly stage; 
     FIG. 3. A longitudinal section through the front panel and the railing fastener in the assembled state; 
     FIG. 4. A side view of the railing fastener with the union sleeve pushed up; 
     FIG. 5. A longitudinal section through the embodiment according to FIG. 4; 
     FIG. 6. A perspective view of the head component according to the first embodiment; 
     FIG. 7. A section through the head component along the line B--B in FIG. 6; 
     FIG. 8. A perspective view of the expansion dowel; 
     FIG. 9. An exploded view of the railing fastener according to FIGS. 1 through 8&#39;s described embodiments; 
     FIG. 10. A second embodiment of the railing fastener with the fastening component in perspective view and corresponding excerpt of the drawer back wall; 
     FIG. 11. A view of the fastener component fixed on the drawer back wall; 
     FIG. 12. A section through the fastening component fixed on the drawer back wall; 
     FIG. 13. A perspective view of the fastening component with the inserted railing pipe; 
     FIG. 14. A section through the fastening component with the inserted railing pipe; 
     FIG. 15. A lateral perspective view of a third embodiment of the railing fastener; 
     FIG. 16. A longitudinal section through the front panel and the railing fastener in the assembly stage; 
     FIG. 17. A longitudinal section through the front panel and railing fastener in the completely assembled state; 
     FIG. 18. A side view of railing fastener with union sleeve pushed up; 
     FIG. 19. A longitudinal section through the embodiment according to FIG. 18; 
     FIG. 20. A section through the expansion dowel with inserted expansion had according to Line B--B in FIG. 18; 
     FIG. 21. A perspective view of the head component according to the first embodiment; 
     FIG. 22. A section through the head component along Line B--B in FIG. 21; 
     FIG. 23. A perspective view of the expansion dowel; 
     FIG. 24. An exploded view of the railing fastener according to the embodiments shown in FIGS. 15 through 23. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     A first embodiment of the railing fastener is represented in FIG. 1. One recognizes schematically a section of the front panel (1) of the drawer, which has a fastening bore hole (2) for an expansion dowel (3). The expansion dowel (3) is inserted before the assembly of the railing fastener in the fastener bore hole (2). The railing fastener, respectively the fastener fitting, consists of a head component (7), which is connected to the expansion dowel (3), as well as an intermediate piece, which carries a setting nut (16) to adjust the railing (17) lengthwise. The head component (7) and the intermediate piece (13) are connectable together by means of a coupling (14) and a corresponding coupling counterpart (15). A union sleeve (18) is located on the railing (17), and it (the union sleeve) can cover the entire system. 
     FIGS. 2 and 3 show the whole system in sections. The expansion dowel (3) fits into the fastening bore hole (2) of the front panel (1). The fastener fitting with its head component (7) and expansion head (8) are now guided in a slanted angle to the expansion dowel&#39;s (3) shaft (long axis) into the expansion dowel; the expansion dowel (3) has guide grooves (4) in which corresponding guide ribs of the expansion head (8) can be guided (compare FIGS. 8 and 9). The expansion head (8) is also inserted slanted into the expansion dowel (3) and pushed in until it hits; then the guide ribs (9) reach, beyond contact with the guide groove (4), and the entire fastener fitting can be swiveled in the arrow direction (19) so that it is located in an axis with the expansion dowel (3), as is evident in FIG. 3. Then one of the shoulders (11) on the expansion head (8) reaches a corresponding notch (6) of the expansion dowel (3) and functions there as counter-bearing; the expansion head (8) presses from inside against the expansion dowel (3) and serves to anchor it in the fastening bore hole (2). The expansion dowel (3), furthermore, has an inwardly directed edge (5) on which a corresponding shoulder (12) of the expansion head (8) is placed. An axial sliding security occurs now, because in this position, the fastener fitting (respectively the expansion dowel [8]) can no longer be taken out of the expansion dowel (3). 
     FIG. 4 shows a side view of the union sleeve (18) pushed over the system. 
     FIG. 5 shows a section of the representation in FIG. 4; here, one recognizes very well how the shoulder (11) of the lever piece (10) lies in the notch (6) of the expansion dowel (3) and how the shoulder (12) of the expansion head (8) fits on the corresponding edge (5) of the expansion dowel (3) so that the expansion head (8) can no longer be taken out of the expansion dowel (3). One also recognizes how the expansion dowel (3) spreads in the receptacle opening (2) and &#34;digs in&#34; with respective outer teeth into the front panel (1). The union sleeve (18) can cover and protect the whole system. 
     FIGS. 6 and 7 show the details of the head component (7). This includes a coupling (14), which enables it to be connected to an intermediate piece (13). A lever piece (10) is provided that carries the shoulder (11) that works as a counter pressure. At the front end of the lever piece an expansion head (8) is located with its guide ribs (9). The coupling (14) has, in the direction of the expansion head (9), two projections (21) located opposite to one another, whose function is described more closely below. 
     The design of the expansion dowel is represented in FIG. 8. One recognizes it in the wall of the insertion opening of the in wrought guide grooves (4) and the notch (6), which &#34;receives&#34; the shoulder (11) of the lever piece (10). Furthermore, one recognizes the two-part formation of the dowel end piece that makes an expansion or spreading by the corresponding inside-pressure possible. The catch teeth on the outer perimeter of the expansion dowel allow &#34;this&#34; to be anchored firmly in a corresponding fastening bore hole. At the front of the expansion dowel (3) are two notches (22), which are located opposite from one another, and in which the projections (21) of the coupling (14) engage. These are used for the alignment and locking safety of the connection. 
     FIG. 9 shows an exploded representation of the railing fastener in the embodiment according to FIGS. 1 through 8. 
     FIGS. 10 to 14 now show another embodiment of a railing fastener, especially concerning the back fastening on the back wall of the drawer. 
     FIG. 10 show a section of the back wall (26), which has an opening (27) on the lateral edge. A fastening component (23) is provided with a hook extension (24), which can hang in the opening (27) so that the fastening component (23) is connected with the back wall (26). It can especially be recognized in FIG. 12 that the hook extension (24) is hanged in the back wall (26); an upper section of the fastening component (23) is placed on the corresponding section of the back wall (26). The fastening component has a detent pawl, which is directed opposite of the hook extension (24), whose dimensions are exactly sized to fill up the remaining part of the opening (27) with the inserted hook extension (24). The detent pawl (25) is formed as a springy tab and this prevents the fastening component (23) from being removed from the back wall (26) since this detent pawl (25) prevents the hook extension from coming out. The locking action of the detent pawl (25) can be lifted manually or with the corresponding tool; that is, the detent pawl can be pressed out from inside the drawer so that the fastening component (23) can be removed from the back wall. 
     FIGS. 11 and 13, especially, show the fastening component (23) that has a receptacle opening (28) for the railing pipe (29). The railing pipe (29) can be inserted into the receptacle opening (28) and locked into it. The railing pipe (29) proceeds over the tab (30), whose free end points in the direction of the railing pipe end. FIG. 14 shows a catch shoulder (31) that projects in the opening (28) of the fastening component (23); it (the catch shoulder) presses the tabs (30) radial and inward when the railing pipe (29) locks within the opening (28). 
     A third embodiment of the railing fastener is shown in FIGS. 15 through 24. A section of the front panel (32) is represented in FIG. 15 in which an expansion dowel (34) can be inserted in a corresponding fastening bore hole (33) in the front panel. The railing pipe, itself, is connected to a head component (38), which can be anchored in the expansion dowel (34). The entire system can be covered with a union sleeve (44). 
     FIG. 16 shows that, on the other hand, the fastening fitting is inserted at an angle to the shaft (lengthwise axis) of the expansion dowel (34). The head component (38) has two bearing shoulders (40) located opposite from each other, which come to lie in the corresponding bearing notches (35) of the expansion dowel (34), after the complete insertion of the head component (39). After the complete insertion of the expansion head (39) in the expansion dowel (34), corresponding catch shoulders (42) on the expansion head (39) reach respective catch notches (36) of the expansion dowel (34) in a first lock-in position. Now the fastener fitting can be swiveled or swung in the arrow direction (45) so that it forms a line with the shaft (lengthwise axis) of the expansion dowel (34). So the head component (38) is also swiveled along an axis defined by the bearing shoulders (40), so that the expansion head (39) is pressed on the inner wall of the fastening bore hole (33) and buries itself on a corresponding anchoring projection (41) on the expansion head (39) in the front panel&#39;s material. Simultaneously, the catch shoulder (42) of the expansion head (39) reaches a second lock-in position, which is defined by a second catch shoulder (37) in the expansion dowel (34). Through this second &#34;catch&#34; position and by the action and effect of the anchoring projection (41), the fastener fitting is secured against axial movement in the expansion dowel and is solidly secured in it. As shown, especially in FIGS. 19 and 20, the head component (38) has an expansion wedge (47), whose cross-section is formed somewhat V-shaped. 
     The push-in opening of the expansion dowel is fitted crosswise to this expansion wedge (47); it is wider at the lower part than the middle part and wider at the middle part than at the upper part. This makes it possible to insert the expansion head (39) with the expansion wedge (47) into the expansion dowel (34) so that after the expansion head (and with it, the expansion wedge [47]) is swiveled, it presses with its larger cross section against the inner walls of the expansion dowel (34) and there it expands and anchors firmly in the front panel (32). The expansion dowel (34) has on its outer perimeter a tooth system, which respectively buries itself into the material of the front panel. 
     FIGS. 21 and 22 show the details of the head component (38). This includes an expansion wedge (47), which is connected to the expansion head (39). One can recognize the anchoring projection (41) arranged on the upper part of the expansion head very well, as well as the catch shoulders (42) that are located opposite to the insertion direction. The head component (39) has two oppositely placed bearing shoulders (40) to support the swinging motion. The bearing shoulders, which will be described in more detail below, engage in the corresponding bearing notches (35) of the expansion dowel (34). FIG. 22 clearly shows the wedge-shaped design of the expansion wedge (47). 
     FIG. 23 shows the details of the expansion dowel (34). This has a somewhat wedge-shaped insertion opening, which is wider at the bottom than at the top. The insertion opening widens in the rear area so that the inserted expansion head (39) has room. Bearing notches (35) are placed in the area of the insertion opening where the bearing shoulders (40) of the head component (38) come to rest. The catch notches (36) are shown in the rear area; they engage, depending on the swinging movement, the corresponding catch shoulders (42) of the expansion head (39). They, in the catch shoulders (47) corresponding position of the expansion head (39), can no longer loosen axially from the expansion dowel (34). 
     FIG. 24 shows, finally, an exploded representation of the embodiment, which is described in FIGS. 15 through 23. 
     Drawing Legend 
     1. Front panel 
     2. Fastening bore hole 
     3. Expansion dowel 
     4. Guide groove 
     5. Edge 
     6. Notch 
     7. Head component 
     8. Expansion head 
     9. Guide ribs 
     10. Lever piece 
     11. Shoulder 
     12. Shoulder 
     13. Intermediate piece 
     14. Coupling 
     15. Coupling counterpart 
     16. Setting nut 
     17. Railing pipe 
     18. Union sleeve 
     19. Arrow direction 
     20. Arrow direction 
     21. Projection 
     22. Notch 
     23. Fastening component 
     24. Hook extension 
     25. Detent pawl 
     26. Back panel 
     27. Opening 
     28. Opening 
     29. Railing pipe 
     30. Tab 
     31. Catch shoulder 
     32. Front panel 
     33. Fastening bore hole 
     34. Expansion dowel 
     35. Bearing notch 
     36. Catch notch 
     37. Catch shoulder 
     38. Head component 
     39. Expansion head 
     40. Bearing shoulder 
     41. Anchoring projection 
     42. Catch shoulder 
     43. Railing pipe 
     44. Union sleeve 
     45. Arrow direction 
     46. Arrow direction 
     47. Expansion wedge 
     48. Teeth