DE3807001A1 - Device for connecting two workpieces - Google Patents

Abstract

A description is given of a device for connecting two workpieces which contain through-passages (13, 14) which can be superimposed, having a screw (15)/nut (16) arrangement which can be guided through the through-passages. The nut exhibits an axial attachment (20) which can be plugged through one of the through-passages (13) and can be extended and compressed resiliently at least partially in the radial direction. Said attachment bears protrusions (21) which prevent it from falling out of the through-passage. At least part of the internal thread (22) of the nut in the region of the attachment can, by axial insertion of the shaft of the screw, be brought into engagement with the external thread thereof. The extensibility and compressibility of the nut is obtained by longitudinal slits (17, 18). <IMAGE>

Description

The invention relates to a device according to the Preamble of claim 1.

From DE-GM 77 32 253 is a pipe clamp two approximately semicircular clamp bands known to be detachable with each other at their ends are connected. Two opposite each other The ends of the clamp bands form a tensionable one releasable closure, which on the one band End bent back outward in an arc cut with a tape Slot, one of the arcuate end portion loosely encompassed round pin and one in the pin transversely screwed head screw with through the Has slot matching shaft and on another band of clamps one off to the outside curved end portion with a in the tape direction extending, at the end open second slot, through the shaft of the cap screw, but not their  Head fits through. The connection of the two other ends of the clamp bands is hinge well-trained. For folding the pipe clamp the hinge-like connection is made around a tube so far apart that the through the Cap screw to connect ends of the two Clamp bands from one side over the pipe pushed and pulled together on the other side can be pressed. Here, the pen with the screwed head screw swiveled so that the screw head at the end of the clamps bandes with the open second slot over leads. Then the pen is pivoted so that the screw head gets under this end with the shaft of the cap screw in the open second slot arrives. The cap screw will now tightened up the pipe clamp the pipe firmly spanned. The assembly of this pipe clamp is very easy, as slipping on it Tube and aligning the cap screw in the Tightening position can be made with one hand can. The work can be done with the other hand ready to tighten the cap screw hold or hold the pipe.

However, this known pipe clamp has the disadvantage that it cannot withstand major loads. There is a risk that a strong bean stress in the direction of the screw axis horizontal tips of the through the open slot bent end of the clamp band and so the Screw slips out of the slot and that Clamp band end releases. This is also pipe ring very complex.  

DE-OS 16 75 201 describes a pipe clamp for water drainage pipes or the like two half clamps, the free ends of which are separated by one Threaded bolts are connected to each other, through a hole in one half clamp inserted through and into a threaded The other half clamp is screwed in. This is in the hole this other half ring a nut firmly pressed in. This pipe can also be clamped with one hand be assembled, which can be relatively tedious can, if with this one hand initially both Half clamps held together and the threaded bolt introduced to the mother and with her first Turns must be engaged. This difficulty is exacerbated when the nut is not exactly vertical in the hole is pressed or the free end of the mother holding half clamp is slightly bent.

It is therefore the object of the present invention the known device for connecting two Workpieces, one on top of the other passages to be brought, with a to be passed through the passageways Screw-nut arrangement, in the way to ver better that despite high resistance ability to withstand mechanical loads and one simple training with just one hand easily can be assembled.

This object is achieved by the specified in the characterizing part of claim 1 Characteristics. Advantageous further developments of the inventions device according to the invention result from the  Subclaims.

The invention is characterized in that the Nut an axial, through one of the through pluggable gears, at least partially in radial Directionally expandable and compressible Approach has the approach of falling out protruding protrusions from the passage, and that at least part of the internal thread the nut in the area of the approach by axial Insert the shaft of the screw with its External thread can be brought into engagement. By the The plugged-in mother therefore does not approach only movably held in the workpiece and against Secured falling out, but it will too its internal thread simply by inserting the Screw engages with their external thread brought so that the screw thereby is held. The often tedious is thus eliminated Process of threading the screw into the first Thread of the nut and basically that initial screws at all. To the tension to enlarge between screw and nut, can then be screwed on in the usual way.

Preferably the outer surface of the neck and the inner surface of the associated passage trained so that the plug-in approach when moving in its push-through direction is compressed towards the passage. This feature ensures that when the mother when the screw is inserted with its shoulder deeper into the passage of the workpiece is pressed or pulled, the internal thread of the  Approach is compressed and thus that Firmly grips the external thread of the screw. screw and mother can do it by a pure move can no longer be separated by force.

Appropriately, the through-taking has corridor and also the assigned one Approach a deviating from the circular shape Cross-section. This prevents the nut turns when the screw is tightened, without the mother's hand or one Tool must be held.

The invention is described below with reference to in the embodiments shown in the figures explained in more detail. These affect the connection two half clamps of a pipe clamp.

Show it:

Fig. 1 shows a pipe clamp, in perspective view,

Fig. 2 (a) to 2 (c) shows a first embodiment of a screw-nut assembly, and

Fig. 3 (a) to 3 (c) shows a second embodiment of a screw-nut assembly.

The steel pipe clamp shown consists of an upper half clamp 1 and a lower half clamp 2 . The upper half clamp 1 carries a welded-on connecting part 3 , which is bridge-shaped and consists of a U-shaped flat material. The connecting part 3 contains in its horizontal web 4 a bore 5 through which a threaded rod 6 is inserted. To connect this threaded rod 6 with the connecting part 3 , a nut 7 is provided.

At the rear end in FIG. 1, the half clamps 1 and 2 each have an end section (clamp ear) 8 , 9 which is bent outwards in the horizontal direction. Both end sections 8 and 9 each contain a circular passage 10 ; a screw is passed through it from below when installing the pipe clamp. Above the Endab section 8 , a nut is screwed onto the screw inserted through the passages 10 .

At the front end in FIG. 1, the half clamps 1 and 2 also each have an end section 11 , 12 which is bent outwards in the horizontal direction. In each of these end sections 11 , 12 there is a passage 13 , 14 , the passage 14 in the lower end section 12 having a circular cross section and the passage 13 in the upper end section 1 having, for example, a hexagonal cross section. The passages 13 , 14 serve to take on a screw-nut arrangement, as shown by way of example in FIGS. 2 and 3.

In Figs. 2 (a) and 3 (a), the end portions are respectively 11 and 12 and the screw-nut arrangement is shown in an exploded state ge. The screw 15 is of conventional shape and the same in both embodiments.

The Fig. 2 (b) and 3 (b) show positions of the Querschnittsdar inserted into the passage 13 nut, wherein the extension of the nut protrudes just out of the passage 13. The Fig. 2 (c) and 3 (c) correspond to Figs. 2 (b) and 3 (b), the nut, however, each be further inserted into the passage 13.

The nut 16 according to FIG. 2 is in one piece and is optionally made of metal or plastic. This nut 16 can be resiliently spread and compressed by three longitudinal slots 17 and 18 over its entire length in the radial direction. These do not extend over the entire length of the nut 16 , but the longitudinal slots 17 on one end face and the longitudinal slots 18 on the other end face of the nut 16 are open, the longitudinal slots 17 and 18 alternating in the circumferential direction.

The nut 16 consists of a rear flange part 19 in its insertion direction with a greater radial extent than that of the passage 13 and a longitudinally arranged in front of it approach 20 which can be inserted into the passage 13 . The front edge of the extension 20 carries a circumferential outward projection 21 which, as shown in FIG. 2 (b), prevents the inserted nut 16 from falling out of the passage 13 . To insert the nut 16 , the neck 20 is slightly compressed by narrowing the longitudinal slots 17 and 18 , which is possible with relatively little effort. After inserting the lug 20 , this is released again, so that it springs back into its original shape and the jump 21 overlaps the passage 13 , as can be seen from Fig. 2 (b).

The nut 16 has an internal thread 22 which is connected in the longitudinal direction and extends from the rear end of the flange part 19 to over half of the extension 20 . This internal thread 22 is in the longitudinal direction through the longitudinal slots 18 completely and partially divided by the longitudinal slots 17 .

The rear part of the extension 20 in its push-through direction has a circumferential surface tapering in this direction and the inner surface of the passage 13 is adapted accordingly, ie the passage 13 narrows in the push-through direction.

Furthermore, the circumference of the cross section of the set 20 is not circular, but hexagonal, one of the longitudinal slots 17 and 18 running in the middle of each of the hexagons. In this respect, the passage 13 is the approach 20 fits and has a hexagonal inner surface.

To establish a fixed screw connection between the end sections 11 and 12 , the nut 16 is first inserted into the passage 13 so that they assume a mutual position as shown in FIG. 2 (b). The screw 15 is then inserted through the end section 12 and inserted into the opposite end of the extension 20 . The screw 15 and the nut 16 or the end section 11 are then pressed together with one hand, the external thread of the screw 15 and the internal thread 22 of the nut 16 overlapping. The tapered part of the neck 20 ge reaches if necessary after releasing the end portion 11 in the passage 13 , and with further advancement or advance of the nut 16 , the neck 20 is compressed more, so that the external thread of the screw 15 and the internal thread of the nut 16th so engaged that their connection can no longer be solved by a pulling force. This connection gives the pipe clamp and the pipe a sufficient hold so that they can be released. The screw connection can now be given additional strength by turning the screw 15 . By the hexagonal formation of approach 20 and passage 13 , a turning of the nut 16 is prevented.

In the embodiment according to FIG. 3, the nut 16 is not formed in one piece, but instead contains in the flange part a metal core 23 which is undivided in the longitudinal direction in the form of a conventional nut and an extension 24 made of plastic. The approach 24 merges into a plastic jacket 25 surrounding the metal core 23 , so that they are firmly connected to one another. Longitudinal slots 26 and 27 extend in a manner corresponding to the longitudinal slots 17 and 18 only through the plastic consisting of extension 24 and jacket 25 . The projection 24 also carries the projection 21 . The internal thread of the nut 16 here consists of a metal section 28 and a plastic section 29 , which, however, lie practically seamlessly one behind the other and thus represent an almost uniform thread for the screw 15. The outer circumference of the extension 24 and accordingly the inner surface of the passage 13 are not hexagonal here , but have a much larger number of corners, so that they are closer to the circular shape. This also fully secures against rotation of the nut 16 .

The mode of operation and also the resilience of the mother according to FIG. 3 are the same as that of the mother according to FIG. 2. The question of which of them is to be preferred is essentially answered by the production costs. In the nut of FIG. 3 or a plastic nut according to FIG. 2, the longitudinal slits can be incorporated equal in the manufacture of the plastic part, while an existing all-metal nut according to Fig. 2, this only afterwards usually, for example by means of laser beams , be cut.

The use of the metal core 23 in the mother of FIG. 3 has the advantage of an additional safety over a pure plastic nut in the event that the plastic can not withstand the mechanical loads permanently or should not withstand any chemical attack and / or heat.

When assembling the device, the half clamps 1 and 2 are first connected to one another via the end sections 8 and 9 and the nut 16 is inserted into the end section 11 . The half-clamps are then placed around the pipe to be hung, with the end sections 11 and 12 then being held in their mutual position according to FIG. 2 (a) or 3 (a) with one hand and the screw 15 through the end section 12 in the approach 20 or 24 is introduced. With the same hand screw 15 and nut 16 are then pushed together until it has approximately the position shown in FIG. 2 (c). The Außenge thread of the screw 15 and the internal thread of the nut 16 are already so far engaged by the conicity of the neck 20 and 24 that they can no longer be easily separated by tensile forces. Finally, the screw 15 is tightened, the nut 16 being secured against turning by the adapted formation of the extension 20 or 24 and passage 13 .

The mother can also be trained in this way be that they consist of several, continuous Longitudinal slots are separate parts that by an elastic covering, for example through an outer rubbery ring or a Tape, held together. When plugging in the screw in this nut gives the wrapping slightly behind so that the parts are radially outward retreat and the internal thread of the nut and the external thread of the screw is in axial Cover direction.

The present embodiment deals with only the connection of two half clamps one Pipe clamp; however, it is obvious that the present device generally for the Connection of two each with a corresponding one  Passage provided workpieces used can be.

Claims (15)

1. Device for connecting two work pieces, each containing passages to be brought one above the other, with a screw-nut arrangement to be passed through the passages, characterized in that the nut ( 16 ) has an axial through which one of the passages ( 13th ) pluggable, at least partially in the radial direction resiliently expandable and compressible approach ( 20 ; 24 ), that the approach ( 20 ; 24 ) carries out falling out of the passage ( 13 ) preventing projections ( 21 ), and that at least part of Internal thread ( 22 ; 28 , 29 ) of the nut ( 16 ) in the area of the shoulder ( 20 ; 24 ) can be brought into engagement with the external thread thereof by axially inserting the shaft of the screw ( 15 ). 2. Apparatus according to claim 1, characterized in that the outer surface of the extension ( 20 ; 24 ) and the inner surface of the associated passage ( 13 ) are designed such that the inserted extension ( 20 ; 24 ) with a movement in its push-through direction opposite the passage ( 13 ) is compressed. 3. Apparatus according to claim 2, characterized in that the outer surface of the extension ( 20 ; 24 ) tapers in its push-through direction. 4. The device according to claim 3, characterized in that the inner surface of the passage ( 13 ) corresponding to the taper of the neck ( 20 ; 24 ) is inclined relative to the axial direction. 5. Device according to one of claims 1 to 4, characterized in that the nut ( 16 ) is provided at least in the region of the neck ( 20 ; 24 ) with open at one end longitudinal slots ( 17 , 18 ; 26 , 27 ). 6. The device according to claim 5, characterized in that the open ends of the longitudinal slot ( 17 , 18 ; 26 , 27 ) are each alternately on the front and rear end faces of the nut ( 16 ), and that the longitudinal slots ( 17 , 18 ; 26 , 27 ) overlap. 7. Device according to one of claims 1 to 6, characterized in that the approach ( 20 ; 24 ) receiving passage ( 13 ) has a cross-section deviating from the circular shape. 8. The device according to claim 7, characterized in that the passage ( 13 ) has a polygonal cross section. 9. Apparatus according to claim 7 or 8, characterized in that at least part of the extension ( 20 ; 24 ) has a cross-section deviating from the circular shape. 10. Device according to one of claims 1 to 9, characterized in that the nut ( 16 ) is a unitary part and consists of metal or plastic. 11. Device according to one of claims 1 to 9, characterized in that the nut ( 16 ) at the rear end in its push-through direction a metal core ( 23 ) with a rigid internal thread ( 28 ) and a shoulder ( 24 ) made of plastic with a radial Direction changeable internal thread ( 29 ). 12. The apparatus according to claim 11, characterized in that the metal core ( 23 ) is surrounded by a one-piece with the projection ( 24 ) formed plastic jacket ( 25 ). 13. The device according to one of claims 1 to 4, characterized in that the mother from several, through continuous longitudinal slots separate parts, and that these parts held together by an elastic element are. 14. The apparatus according to claim 13, characterized records that the elastic element is an annular band. 15. Device according to one of claims 1 to 14, characterized in that the workpieces to be connected are two half clamps ( 1 , 2 ) of a pipe clamp, and that the passages ( 13 , 14 ) each cut in an outwardly bent end ( 11 , 12 ) of each half clamp ( 1 , 2 ).