CA1102846A - Connecting piece for supply lines carrying gaseous or fluid media - Google Patents
Connecting piece for supply lines carrying gaseous or fluid mediaInfo
- Publication number
- CA1102846A CA1102846A CA335,962A CA335962A CA1102846A CA 1102846 A CA1102846 A CA 1102846A CA 335962 A CA335962 A CA 335962A CA 1102846 A CA1102846 A CA 1102846A
- Authority
- CA
- Canada
- Prior art keywords
- connecting member
- recess
- segment
- central body
- axially facing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
- F16L33/22—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses with means not mentioned in the preceding groups for gripping the hose between inner and outer parts
- F16L33/225—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses with means not mentioned in the preceding groups for gripping the hose between inner and outer parts a sleeve being movable axially
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L37/00—Couplings of the quick-acting type
- F16L37/02—Couplings of the quick-acting type in which the connection is maintained only by friction of the parts being joined
- F16L37/04—Couplings of the quick-acting type in which the connection is maintained only by friction of the parts being joined with an elastic outer part pressing against an inner part by reason of its elasticity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L37/00—Couplings of the quick-acting type
- F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
- F16L37/12—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using hooks, pawls or other movable or insertable locking members
- F16L37/133—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using hooks, pawls or other movable or insertable locking members using flexible hooks
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
ABSTRACT
A connecting assembly is disclosed for supply lines carrying gaseous or fluid media. The assembly includes a non-symmetrical connecting member designed as a clamping tool to embrace the inserted end of a supply line. It also includes another member joined to the connecting member by insertion and secured thereto by means of an annular quick-release lock con-sisting of a continuous annular groove in one of the members, and a contin-uous annular projection on the other of the members, these two members to-gether forming a continuous bore to constitute a passage, the connecting member being pushed over the other member.
A connecting assembly is disclosed for supply lines carrying gaseous or fluid media. The assembly includes a non-symmetrical connecting member designed as a clamping tool to embrace the inserted end of a supply line. It also includes another member joined to the connecting member by insertion and secured thereto by means of an annular quick-release lock con-sisting of a continuous annular groove in one of the members, and a contin-uous annular projection on the other of the members, these two members to-gether forming a continuous bore to constitute a passage, the connecting member being pushed over the other member.
Description
This invention relates to a connecting assembly capable of provid-ing a connection with supply lines carrying gaseous or fluid media, which assembly comprises a non-symmetrical connecting member designed in the form of a clamping tool to embrace the end of a supply line inserted into the con-necting member, and another member, the two members being assembled by inser-tion of one into the other, and secured by means of an annular quick-release lock consisting of an annular groove in one of the members and a continuous pro~ection on the other member whereby these members, assembled into one connecting assembly, provide a continuous passage, both having a central bore.
A connecting assembly of this kind is described in the DOS 25 28 757. The connecting member is inserted into the other member and an annular groove around the internal circumference of the other member cor-responds to an annular projection on the external circumference of the con-necting member. With this arrangement, the diameter of the quick-release lock is relatively small and the effective axial loading area of the connec-tion between the two surfaces of the groove and projection, is correspondingly small. In consequence thereof there are created a number of unfavourable conditions when high axial forces are present or when the media in the supply lines are streaming alternatingly in opposite directions and create pulsating loads. This is especially unfavourable when the two members of the connect-ing assembly are made of a plastics material because the surface pressure may be so high that it resiliently expands the other member and elastically com-presses the connecting member which is inserted into the latter, at least in the area of the annular lock. This condition may lead to the unintentional release of the lock. In addition to this there is the danger of the annular projection being torn off under shear loads resulting from an excessive sur-face pressure, especially with connecting assemblies assembled from a member made of a plastics material, and a connecting member made of metal.
1~28~
Another drawback which is due to the relatively small diameter of the ~nnular quick-release connection is explained below: The resilient expansion of the other member, and the elastic compression of the connect-ing member, aggravated by the danger of shearing the projection off, depend substantially on the choice of the materials used in the manufacture of the other member. It is easy to see that a member consisting of metal will hardly be resiliently expanded under axial loads. However, the danger of shearing is greater, especially when the adjacent connecting member consists of a plastics material. This danger may be counteracted by a correspondingly resistant profile of the annular projection. This dependency on the struc-tural materials makes it necessary to provide two different connecting mem-bers of different dimensions when a connecting assembly is used with supply - lines having different diameters, to be suitable for the other member which may be manufactured of metal or of a plastic material.
It is an object of the present invention to provide a connecting assembly of the type referred to above which, in order to avoid the above drawbacks, is designed in such a manner that the danger of excessive axial surface pressure does not occur.
According to the invention there is provided a connecting piece for supply lines carrying gaseous or fluid media, comprising: a first elongated and hollow connecting member having a first central body segment with an enlarged end structure on one end terminating in a first axially facing surface which has a first axially facing recess therein communicating with the interior of said hollow connecting member and opening in a direction remote from said first central body segment, the bottom of said first recess defining a second axially facing surface extending parallel to said first surface, said first recess having an annular recess on the internal surface thereof intermediate said first and second surfaces, a supply line clamping . ,.
~l~Z~
means connected to said first central body segment on an end thereof remote from said enlarged end structure; a second elongated and hollow connecting member having a second central body segment with an end segment extending away from said second central body segment and a sleeve segment extending axially away from said second central body segment on a side thereof opposite said end segment, said sleeve segment having a cross-sectional size less than the cross-sectional size of said second central body segment to thereby define a third axially facing surface facing in a direction toward said first surface on said first connecting member, said sleeve terminating in a fourth axially facing surface parallel to said third surface, said fourth surface having a second axially facing recess therein communicating with the interior of said second connecting member, the bottom of said second recess defining a fifth axially facing surface extending parallel to said third and fourth surfaces, the axial spacing between said third and fourth surfaces on said second connecting member being equal to the axial spacing between said first and second surfaces on said first connecting member, said sleeve segment having an annular projection on the external surface thereof intermediate said third and fourth surfaces; said sleeve segment being received ;n said first recess with said third surface thereof engaging said first surface and with said fourth surface engaging said second surface, a compressible seal member received in said second recess and being compressed between said second and fifth surfaces, said annular projection being operatively received in said annular recess to hold said first and second connecting members in a coupled relationship and said first and third surfaces as well as said second and fourth surfaces in engagement with each other.
Embodiments of the invention will now be described, by way of example, with reference to the accompany ng drawings, in which:-; ~-
A connecting assembly of this kind is described in the DOS 25 28 757. The connecting member is inserted into the other member and an annular groove around the internal circumference of the other member cor-responds to an annular projection on the external circumference of the con-necting member. With this arrangement, the diameter of the quick-release lock is relatively small and the effective axial loading area of the connec-tion between the two surfaces of the groove and projection, is correspondingly small. In consequence thereof there are created a number of unfavourable conditions when high axial forces are present or when the media in the supply lines are streaming alternatingly in opposite directions and create pulsating loads. This is especially unfavourable when the two members of the connect-ing assembly are made of a plastics material because the surface pressure may be so high that it resiliently expands the other member and elastically com-presses the connecting member which is inserted into the latter, at least in the area of the annular lock. This condition may lead to the unintentional release of the lock. In addition to this there is the danger of the annular projection being torn off under shear loads resulting from an excessive sur-face pressure, especially with connecting assemblies assembled from a member made of a plastics material, and a connecting member made of metal.
1~28~
Another drawback which is due to the relatively small diameter of the ~nnular quick-release connection is explained below: The resilient expansion of the other member, and the elastic compression of the connect-ing member, aggravated by the danger of shearing the projection off, depend substantially on the choice of the materials used in the manufacture of the other member. It is easy to see that a member consisting of metal will hardly be resiliently expanded under axial loads. However, the danger of shearing is greater, especially when the adjacent connecting member consists of a plastics material. This danger may be counteracted by a correspondingly resistant profile of the annular projection. This dependency on the struc-tural materials makes it necessary to provide two different connecting mem-bers of different dimensions when a connecting assembly is used with supply - lines having different diameters, to be suitable for the other member which may be manufactured of metal or of a plastic material.
It is an object of the present invention to provide a connecting assembly of the type referred to above which, in order to avoid the above drawbacks, is designed in such a manner that the danger of excessive axial surface pressure does not occur.
According to the invention there is provided a connecting piece for supply lines carrying gaseous or fluid media, comprising: a first elongated and hollow connecting member having a first central body segment with an enlarged end structure on one end terminating in a first axially facing surface which has a first axially facing recess therein communicating with the interior of said hollow connecting member and opening in a direction remote from said first central body segment, the bottom of said first recess defining a second axially facing surface extending parallel to said first surface, said first recess having an annular recess on the internal surface thereof intermediate said first and second surfaces, a supply line clamping . ,.
~l~Z~
means connected to said first central body segment on an end thereof remote from said enlarged end structure; a second elongated and hollow connecting member having a second central body segment with an end segment extending away from said second central body segment and a sleeve segment extending axially away from said second central body segment on a side thereof opposite said end segment, said sleeve segment having a cross-sectional size less than the cross-sectional size of said second central body segment to thereby define a third axially facing surface facing in a direction toward said first surface on said first connecting member, said sleeve terminating in a fourth axially facing surface parallel to said third surface, said fourth surface having a second axially facing recess therein communicating with the interior of said second connecting member, the bottom of said second recess defining a fifth axially facing surface extending parallel to said third and fourth surfaces, the axial spacing between said third and fourth surfaces on said second connecting member being equal to the axial spacing between said first and second surfaces on said first connecting member, said sleeve segment having an annular projection on the external surface thereof intermediate said third and fourth surfaces; said sleeve segment being received ;n said first recess with said third surface thereof engaging said first surface and with said fourth surface engaging said second surface, a compressible seal member received in said second recess and being compressed between said second and fifth surfaces, said annular projection being operatively received in said annular recess to hold said first and second connecting members in a coupled relationship and said first and third surfaces as well as said second and fourth surfaces in engagement with each other.
Embodiments of the invention will now be described, by way of example, with reference to the accompany ng drawings, in which:-; ~-
2~4~
Figure 1 shows a first embodiment of the invention in a side view and in longitudinal section, Figure 2 shows a variant to the arrangement according to Figure 1 in a partly sectional side view, and Figures 3 and 4 show two further embodiments of the invention, namely a knee piece and a so-called T-shaped piece in a partly sectional side view.
The connecting assembly shown in Figure 1 of the drawings is com-posed of two sections, namely the connecting member 1 at one end, and the threaded member 2 at the other end of the assembly. The connecting member 1 is designed in the manner of a clamping tool comprising a number of cla.mping elements 3, 4 which are equidistantly arranged around the circumference and separated from each other by slots 5. The clamping elements 3, 4 extend from a central part 6 of the connecting member in a direction away from the thread-ed member 2 so that the free ends of the tool elements 3, 4, are remote from the threaded member 2. A clamping ring 7 which is movable in both axial directions according to the arrows 9a is mounted on the external circum-ference of the clamping elements 3, 4. In its effective extreme position which is - 3a -13L~;32~
shown in the illustration, the ring presses the clamping tool elements to-gether so that their initially cylindrical form is forced towards the inside.
An annular safety collar 8 at the outer end of the clamping tool prevents the ring 7 from being unintentionally pulled off. When the clamping ring 7 is moved in the direction of the arrow g and over a conical section 10 of the connecting member 1 it assumes its ineffective position and the clamping ele-ments 3, 4 may snap elastically towards the outside provided that the clamp-ing ring 7 is located on the cylindrical, reduced diameter section 11, which means that the opening between the clamping tool elements widens correspond-ingly. There is moreover an annular, tooth shaped, pro~ection 12 whichextends around the internal circumference of the clamping tool elements 3, 4.
The tooth shaped annular pro~ection 12 is not sharp-edged so that there results an ad~antageously small notch effect on the tube which is only deformed (the tooth does not cut into the tube), so that with the connecting assembly according to the invention there can be used soft and hard flexible tubes or hoses and also so-called PM-tubes or pipes. It is further to be seen that the tooth n ank 12a facing the threaded member is steeper than the other tooth flank 12b, so that the insertion of the tube in direction of the arrow 9 - the tube slides over the tooth flank 12b - is easier than the ex-traction of the tube in the opposite direction.
At the end ad~acent to the threaded member 2 the connecting member1 has an enlarged diameter section 13 which is ad~acent to the cylindrical section 11 having a smaller diameter, and is substantially cylindrical, its bottom forming a radially directed shoulder 14. Finally, there is an annular groove 15 which extends along the internal circumference of the wider part 13.
The threaded member 2, which has at one end a threaded part 16 to connect for example with a rigid line made of metal, also has, ad~acent to the part 16, in the direction towards the connecting member 1, an external col-lar 17, which projects radially and may for example be of hexagonal shape sothat it can be operated with the aid of a wrench. Adjacent to this collar 17 is an annular projection 18 which is of a smaller diameter than the collar 17 and has on its external circumference a continuous nose 19 which, like the annular groove 15, is fully annular, its cross-section corresponding to the latter. A recess is cut out of the front surface of the threaded member 2 which is adjacent to the connecting member 1, the cut-out being annular and radially extending towards the central continuous bore 20 which extends through the threaded member and the connecting member, and also being open on said front surface so that it may accommodate an 0-ring 22 consisting of a sealing material.
The substantially cylindrical wider part 13 of the connecting member 1 is pushed over the annular projection 18 of the threaded member 2 whereby the continuous nose 19 on the external circumference of the threaded member engages with the corresponding annular groove 15 in the internal circumference of the connecting member, constituting a quick-release lock. In the assembled state the radially extending step 14 of the connecting member 1, which is formed by the bottom of the wider part 13, rests against the front face of the threaded member 2 so that the 0-ring 22 between the two members of the con-necting piece is forming a seal. Moreover, with the assembled connectingassembly, the free end of the wider part 13 rests against the end face of the collar 17 which is adjacent to the connecting member 1, providing a stop for the end of the latter which was pushed over the other member. Finally it may be pointed out when describing the physical features of the connecting assem-bly that the collar 17 on the threaded member is axially spaced from the front face of the latter, which is adjacent to the connecting member 1, and also relative to the 0-ring 22.
It can be seen that the snapping and catching connection between 1 ~Z~
the connecting member 1 and the threaded member 2 is absolutely secure and reliable and can often be released or loosened only by destroying the indi-vidual parts. This snapping and catching connection also enables the two parts 1 and 2 to be turned with respect to one another about the longitudinal axis.
Summarising, a connecting assembly is provided which comprises on its threaded member 2 at a given spacing from its front face inserted into the connecting member 1 a radially projectng collar 17 which may for example be of hexagonal form, and adjacent to it an annular projection 18 which is recessed relative to the collar 17, and inserted into the connecting member 1, and comprises on its external circumference an annular nose 19 and on its internal circumference, in the region of the front face of the threaded member 2, a recess 21 which extends towards the central continuous bore 20 and is open on said front face. ~he end of the connecting member 1 which is ad~acent to the threaded member 2 comprises a substantially cylindrical, extended diameter section 13 which embraces the annular extension 18, its free end butting against the collar 17 and one of its radial steps 14 which constitutes the bottom resting against the end face of the threaded member 2, an annular groove 15 whose cross-section corresponds to the continuous nose 19 on the annular projection 18 at the internal circumference of the wider part 13.
For the sake of completeness it is mentioned that the process of assembling begins with withdrawing the clamping ring 7 from its effective into its ineffective position, so that the end of the supply line may be inserted into the connecting piece 1 until it butts against the central step 24 in the continuous bore 20 in the threaded member 2, followed by pushing the clamping ring 7 back into its effective position. Since the radial dimen-sion of the circular step 24 corresponds to the wall thickness of the supply line the through-flow cross-section is constant throughout its entire length.
The arrangement according to the invention can be used in connection with not calibrated soft and hard flexible tubes or hoses manufactured nor-mally from polyethylene, polyamide, or polyurethane, or in connection with rigid tubes or conduits consisting of polyethylene and aluminum (type "PM-Dekabon") which are stiff but can be easily bent by hand.
It follows from the above that the annular groove 15 and the cir-cular pro~ection 19 are located relatively near to the outer surface of the assembly which means that the diameter of this quick-release lock is large.
In this manner it has been achieved that the contact area between the annular groove and pro~ection is correspondingly large in the axial direction. In other words, a large surface is available for the absorption of axial forces created for example by mechanical tensile forces or by pulsating loads in the supply lines, so that the corresponding surface pressure in the quick-release lock is too small to widen elastically the wider part 13. The surface pres-sure in the connection is also too small to shear the annular projection 19 off, even in the case of threaded members 2 consisting of a plastics material.
Whereas the connecting assembly described in the German DOS
25 28 757 comprises an O-ring which is more centrally located inside the threaded member, and the connecting member inserted into the threaded member extends to the O-ring, the assembly according to the invention is different and offers thereby the following advantages over the above.
In the assembled state the connecting member 1 rests against the operating collar 17. It is therefore easy when mounting the parts to ascer-tain from the outside that the two connecting members of the connection are correctly joined to each other and thus to avoid pushing the connecting member too far or not far enough.
Plastic connecting members are preferably manufactured by in~ection moulding because in this case the annular groove 15 is formed with the aid of . 7 --~ 4D
a collapsible core, the latter being a form core the cross-section of which may be reduced in a tapering manner to facilitate the removal of the product.
Although the moulding process with a collapsing core entails the drawback of a longitudinal seam extending over the internal circumference of the wider part 13 this will not interfere at all with operations. The comparable longitudi-nal seam developed in the case of the connecting piece according to the D06 25 28 757, however, which is located on the internal circumference of the threaded member extends up to the region of the O-ring and this may adversely affect the tightness of the assembly.
With hexagonal collars 17 the wall thickness of the threaded member cannot be constant in the region of the collar. When the collar is made of a plastics material the theoretically circular bore is bound to become slightly untrue because of the non-uniform shrinkage of the synthetic material while it solidifies at positions varying in thickness. This slight distor-tion of the continuous bore in the region of the collar decreases in the case of the present invention towards the O-ring 22, bearing in mind that the recess 21 for its accommodation was cut out at a given distance from the col-lar 17. The recess 21 is therefore truly circular and the effect described above does not affect the sealing quality. In contrast, the collar and the O-ring used with the assembly according to the DOS 25 28 757 are located in the same plane and it may therefore easily happen that the sealing seat is out of circularity.
Further advantages of the invention are: the tube fits securely and snugly to the said connecting piece, even when the load is alternating, so that in this case the connection is not influenced disadvantageously;
further, the assembling and disassembling operations can be performed by hand due to the fact that the clamping ring is easily accessible and that the shape is so as to be most favourable for good handling. Only a small ~ 2~9L~i;
pushing force must be exerted on the clamping ring due to the optimal shape of the clamping elements. For disassembling only one hand i5 necessary. The operations "clamping" and "pulling the tube" are separated. Incidentally, the tube can be cut off even obliquely, for example, up to 2mm.
The embodiment according to Figure 2 - all parts consist of syn-thetic material - differs from the embodiment according to Figure 1 only by its dimensions and by its shape: the hexagonal part 30 of the threaded mem-ber has the same diameter as the annular groove 31 on the connecting member 32 which cooperates with the annular pro~ection 33; 34 is the clamping or chuck-ing tool, 35 the clamping ring. In Figure 3 there is shown a right-angled connection assembly, having a knee piece 40 which is inserted between the threaded piece 41 and the connecting member 42 by interposing therebetween, respectively, an O-ring 43, 44. In Figure 4 there is shown a T-shpaed piece as a so-called "plug-in-distributor" which has three connecting pieces or sockets 50, 51 52 interconnected with one another, respectively, via the centrPl distributing piece 53 with three legs 54, 55, 56 and two connections or ~unctions 57, 58.
Figure 1 shows a first embodiment of the invention in a side view and in longitudinal section, Figure 2 shows a variant to the arrangement according to Figure 1 in a partly sectional side view, and Figures 3 and 4 show two further embodiments of the invention, namely a knee piece and a so-called T-shaped piece in a partly sectional side view.
The connecting assembly shown in Figure 1 of the drawings is com-posed of two sections, namely the connecting member 1 at one end, and the threaded member 2 at the other end of the assembly. The connecting member 1 is designed in the manner of a clamping tool comprising a number of cla.mping elements 3, 4 which are equidistantly arranged around the circumference and separated from each other by slots 5. The clamping elements 3, 4 extend from a central part 6 of the connecting member in a direction away from the thread-ed member 2 so that the free ends of the tool elements 3, 4, are remote from the threaded member 2. A clamping ring 7 which is movable in both axial directions according to the arrows 9a is mounted on the external circum-ference of the clamping elements 3, 4. In its effective extreme position which is - 3a -13L~;32~
shown in the illustration, the ring presses the clamping tool elements to-gether so that their initially cylindrical form is forced towards the inside.
An annular safety collar 8 at the outer end of the clamping tool prevents the ring 7 from being unintentionally pulled off. When the clamping ring 7 is moved in the direction of the arrow g and over a conical section 10 of the connecting member 1 it assumes its ineffective position and the clamping ele-ments 3, 4 may snap elastically towards the outside provided that the clamp-ing ring 7 is located on the cylindrical, reduced diameter section 11, which means that the opening between the clamping tool elements widens correspond-ingly. There is moreover an annular, tooth shaped, pro~ection 12 whichextends around the internal circumference of the clamping tool elements 3, 4.
The tooth shaped annular pro~ection 12 is not sharp-edged so that there results an ad~antageously small notch effect on the tube which is only deformed (the tooth does not cut into the tube), so that with the connecting assembly according to the invention there can be used soft and hard flexible tubes or hoses and also so-called PM-tubes or pipes. It is further to be seen that the tooth n ank 12a facing the threaded member is steeper than the other tooth flank 12b, so that the insertion of the tube in direction of the arrow 9 - the tube slides over the tooth flank 12b - is easier than the ex-traction of the tube in the opposite direction.
At the end ad~acent to the threaded member 2 the connecting member1 has an enlarged diameter section 13 which is ad~acent to the cylindrical section 11 having a smaller diameter, and is substantially cylindrical, its bottom forming a radially directed shoulder 14. Finally, there is an annular groove 15 which extends along the internal circumference of the wider part 13.
The threaded member 2, which has at one end a threaded part 16 to connect for example with a rigid line made of metal, also has, ad~acent to the part 16, in the direction towards the connecting member 1, an external col-lar 17, which projects radially and may for example be of hexagonal shape sothat it can be operated with the aid of a wrench. Adjacent to this collar 17 is an annular projection 18 which is of a smaller diameter than the collar 17 and has on its external circumference a continuous nose 19 which, like the annular groove 15, is fully annular, its cross-section corresponding to the latter. A recess is cut out of the front surface of the threaded member 2 which is adjacent to the connecting member 1, the cut-out being annular and radially extending towards the central continuous bore 20 which extends through the threaded member and the connecting member, and also being open on said front surface so that it may accommodate an 0-ring 22 consisting of a sealing material.
The substantially cylindrical wider part 13 of the connecting member 1 is pushed over the annular projection 18 of the threaded member 2 whereby the continuous nose 19 on the external circumference of the threaded member engages with the corresponding annular groove 15 in the internal circumference of the connecting member, constituting a quick-release lock. In the assembled state the radially extending step 14 of the connecting member 1, which is formed by the bottom of the wider part 13, rests against the front face of the threaded member 2 so that the 0-ring 22 between the two members of the con-necting piece is forming a seal. Moreover, with the assembled connectingassembly, the free end of the wider part 13 rests against the end face of the collar 17 which is adjacent to the connecting member 1, providing a stop for the end of the latter which was pushed over the other member. Finally it may be pointed out when describing the physical features of the connecting assem-bly that the collar 17 on the threaded member is axially spaced from the front face of the latter, which is adjacent to the connecting member 1, and also relative to the 0-ring 22.
It can be seen that the snapping and catching connection between 1 ~Z~
the connecting member 1 and the threaded member 2 is absolutely secure and reliable and can often be released or loosened only by destroying the indi-vidual parts. This snapping and catching connection also enables the two parts 1 and 2 to be turned with respect to one another about the longitudinal axis.
Summarising, a connecting assembly is provided which comprises on its threaded member 2 at a given spacing from its front face inserted into the connecting member 1 a radially projectng collar 17 which may for example be of hexagonal form, and adjacent to it an annular projection 18 which is recessed relative to the collar 17, and inserted into the connecting member 1, and comprises on its external circumference an annular nose 19 and on its internal circumference, in the region of the front face of the threaded member 2, a recess 21 which extends towards the central continuous bore 20 and is open on said front face. ~he end of the connecting member 1 which is ad~acent to the threaded member 2 comprises a substantially cylindrical, extended diameter section 13 which embraces the annular extension 18, its free end butting against the collar 17 and one of its radial steps 14 which constitutes the bottom resting against the end face of the threaded member 2, an annular groove 15 whose cross-section corresponds to the continuous nose 19 on the annular projection 18 at the internal circumference of the wider part 13.
For the sake of completeness it is mentioned that the process of assembling begins with withdrawing the clamping ring 7 from its effective into its ineffective position, so that the end of the supply line may be inserted into the connecting piece 1 until it butts against the central step 24 in the continuous bore 20 in the threaded member 2, followed by pushing the clamping ring 7 back into its effective position. Since the radial dimen-sion of the circular step 24 corresponds to the wall thickness of the supply line the through-flow cross-section is constant throughout its entire length.
The arrangement according to the invention can be used in connection with not calibrated soft and hard flexible tubes or hoses manufactured nor-mally from polyethylene, polyamide, or polyurethane, or in connection with rigid tubes or conduits consisting of polyethylene and aluminum (type "PM-Dekabon") which are stiff but can be easily bent by hand.
It follows from the above that the annular groove 15 and the cir-cular pro~ection 19 are located relatively near to the outer surface of the assembly which means that the diameter of this quick-release lock is large.
In this manner it has been achieved that the contact area between the annular groove and pro~ection is correspondingly large in the axial direction. In other words, a large surface is available for the absorption of axial forces created for example by mechanical tensile forces or by pulsating loads in the supply lines, so that the corresponding surface pressure in the quick-release lock is too small to widen elastically the wider part 13. The surface pres-sure in the connection is also too small to shear the annular projection 19 off, even in the case of threaded members 2 consisting of a plastics material.
Whereas the connecting assembly described in the German DOS
25 28 757 comprises an O-ring which is more centrally located inside the threaded member, and the connecting member inserted into the threaded member extends to the O-ring, the assembly according to the invention is different and offers thereby the following advantages over the above.
In the assembled state the connecting member 1 rests against the operating collar 17. It is therefore easy when mounting the parts to ascer-tain from the outside that the two connecting members of the connection are correctly joined to each other and thus to avoid pushing the connecting member too far or not far enough.
Plastic connecting members are preferably manufactured by in~ection moulding because in this case the annular groove 15 is formed with the aid of . 7 --~ 4D
a collapsible core, the latter being a form core the cross-section of which may be reduced in a tapering manner to facilitate the removal of the product.
Although the moulding process with a collapsing core entails the drawback of a longitudinal seam extending over the internal circumference of the wider part 13 this will not interfere at all with operations. The comparable longitudi-nal seam developed in the case of the connecting piece according to the D06 25 28 757, however, which is located on the internal circumference of the threaded member extends up to the region of the O-ring and this may adversely affect the tightness of the assembly.
With hexagonal collars 17 the wall thickness of the threaded member cannot be constant in the region of the collar. When the collar is made of a plastics material the theoretically circular bore is bound to become slightly untrue because of the non-uniform shrinkage of the synthetic material while it solidifies at positions varying in thickness. This slight distor-tion of the continuous bore in the region of the collar decreases in the case of the present invention towards the O-ring 22, bearing in mind that the recess 21 for its accommodation was cut out at a given distance from the col-lar 17. The recess 21 is therefore truly circular and the effect described above does not affect the sealing quality. In contrast, the collar and the O-ring used with the assembly according to the DOS 25 28 757 are located in the same plane and it may therefore easily happen that the sealing seat is out of circularity.
Further advantages of the invention are: the tube fits securely and snugly to the said connecting piece, even when the load is alternating, so that in this case the connection is not influenced disadvantageously;
further, the assembling and disassembling operations can be performed by hand due to the fact that the clamping ring is easily accessible and that the shape is so as to be most favourable for good handling. Only a small ~ 2~9L~i;
pushing force must be exerted on the clamping ring due to the optimal shape of the clamping elements. For disassembling only one hand i5 necessary. The operations "clamping" and "pulling the tube" are separated. Incidentally, the tube can be cut off even obliquely, for example, up to 2mm.
The embodiment according to Figure 2 - all parts consist of syn-thetic material - differs from the embodiment according to Figure 1 only by its dimensions and by its shape: the hexagonal part 30 of the threaded mem-ber has the same diameter as the annular groove 31 on the connecting member 32 which cooperates with the annular pro~ection 33; 34 is the clamping or chuck-ing tool, 35 the clamping ring. In Figure 3 there is shown a right-angled connection assembly, having a knee piece 40 which is inserted between the threaded piece 41 and the connecting member 42 by interposing therebetween, respectively, an O-ring 43, 44. In Figure 4 there is shown a T-shpaed piece as a so-called "plug-in-distributor" which has three connecting pieces or sockets 50, 51 52 interconnected with one another, respectively, via the centrPl distributing piece 53 with three legs 54, 55, 56 and two connections or ~unctions 57, 58.
Claims
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A connecting piece for supply lines carrying gaseous or fluid media, comprising:
a first elongated and hollow connecting member having a first central body segment with an enlarged end structure on one end terminating in a first axially facing surface which has a first axially facing recess therein communicating with the interior of said hollow connecting member and opening in a direction remote from said first central body segment, the bottom of said first recess defining a second axially facing surface extending parallel to said first surface, said first recess having an annular recess on the internal surface thereof intermediate said first and second surfaces, a supply line clamping means connected to said first central body segment on an end thereof remote from said enlarged end structure;
a second elongated and hollow connecting member having a second central body segment with an end segment extending away from said second central body segment and a sleeve segment extending axially away from said second central body segment on a side thereof opposite said end segment, said sleeve segment having a cross-sectional size less than the cross-sectional size of said second central body segment to thereby define a third axially facing surface facing in a direction toward said first surface on said first connecting member, said sleeve terminating in a fourth axially facing surface parallel to said third surface, said fourth surface having a second axially facing recess therein communicating with the interior of said second connecting member, the bottom of said second recess defining a fifth axially facing surface extending parallel to said third and fourth sur-faces, the axial spacing between said third and fourth surfaces on said second connecting member being equal to the axial spacing between said first and second surfaces on said first connecting member, said sleeve segment having an annular projection on the external surface thereof intermediate said third and fourth surfaces;
said sleeve segment being received in said first recess with said third surface thereof engaging said first surface and with said fourth surface engaging said second surface, a compressible seal member received in said second recess and being compressed between said second and fifth surfaces, said annular projection being operatively received in said annular recess to hold said first and second connecting members in a coupled relationship and said first and third surfaces as well as said second and fourth surfaces in engagement with each other.
a first elongated and hollow connecting member having a first central body segment with an enlarged end structure on one end terminating in a first axially facing surface which has a first axially facing recess therein communicating with the interior of said hollow connecting member and opening in a direction remote from said first central body segment, the bottom of said first recess defining a second axially facing surface extending parallel to said first surface, said first recess having an annular recess on the internal surface thereof intermediate said first and second surfaces, a supply line clamping means connected to said first central body segment on an end thereof remote from said enlarged end structure;
a second elongated and hollow connecting member having a second central body segment with an end segment extending away from said second central body segment and a sleeve segment extending axially away from said second central body segment on a side thereof opposite said end segment, said sleeve segment having a cross-sectional size less than the cross-sectional size of said second central body segment to thereby define a third axially facing surface facing in a direction toward said first surface on said first connecting member, said sleeve terminating in a fourth axially facing surface parallel to said third surface, said fourth surface having a second axially facing recess therein communicating with the interior of said second connecting member, the bottom of said second recess defining a fifth axially facing surface extending parallel to said third and fourth sur-faces, the axial spacing between said third and fourth surfaces on said second connecting member being equal to the axial spacing between said first and second surfaces on said first connecting member, said sleeve segment having an annular projection on the external surface thereof intermediate said third and fourth surfaces;
said sleeve segment being received in said first recess with said third surface thereof engaging said first surface and with said fourth surface engaging said second surface, a compressible seal member received in said second recess and being compressed between said second and fifth surfaces, said annular projection being operatively received in said annular recess to hold said first and second connecting members in a coupled relationship and said first and third surfaces as well as said second and fourth surfaces in engagement with each other.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2840648A DE2840648C3 (en) | 1978-09-19 | 1978-09-19 | Connection piece for lines for carrying gaseous or liquid media |
| DEP2840648.6 | 1978-09-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1102846A true CA1102846A (en) | 1981-06-09 |
Family
ID=6049798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA335,962A Expired CA1102846A (en) | 1978-09-19 | 1979-09-19 | Connecting piece for supply lines carrying gaseous or fluid media |
Country Status (8)
| Country | Link |
|---|---|
| AT (1) | AT365758B (en) |
| AU (1) | AU530201B2 (en) |
| BR (1) | BR7905881A (en) |
| CA (1) | CA1102846A (en) |
| DE (1) | DE2840648C3 (en) |
| IN (1) | IN151441B (en) |
| MX (1) | MX149278A (en) |
| NL (1) | NL187452C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3143041A1 (en) * | 1981-10-30 | 1983-05-05 | Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover | Device for the detachable attachment of a hydraulic fluid line to a hydraulic fluid connection |
| DE3734548A1 (en) * | 1987-10-13 | 1989-05-03 | Festo Kg | CONNECTOR |
| CA2066979C (en) * | 1992-03-06 | 1998-08-04 | Michael A. Sweeney | Push in plastic tube fitting |
| DE19538349A1 (en) * | 1995-10-14 | 1997-04-17 | Gema Volstatic Ag | Hose coupling for fluid under pressure for use in powder-coating device |
| DE29603304U1 (en) * | 1996-02-23 | 1996-04-11 | Reiku GmbH, 51674 Wiehl | Hose socket, especially for corrugated pipes |
| DE19716329A1 (en) * | 1997-04-18 | 1998-10-22 | Desoi Gmbh | Pneumatic hose end-fitting with conical section |
| DE19824655C2 (en) * | 1998-05-25 | 2002-08-14 | Veka Ag | Indirect, detachable connection for plastic and metal profiles, especially for plastic pipes |
| DE102021106353A1 (en) | 2021-03-16 | 2022-09-22 | Schaeffler Technologies AG & Co. KG | Connection coupling of a feed unit for workpieces |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2528757C3 (en) * | 1975-06-27 | 1986-07-10 | Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen | Terminal connection unit |
-
1978
- 1978-09-19 DE DE2840648A patent/DE2840648C3/en not_active Expired
-
1979
- 1979-08-02 AT AT0531179A patent/AT365758B/en not_active IP Right Cessation
- 1979-08-17 NL NLAANVRAGE7906283,A patent/NL187452C/en not_active IP Right Cessation
- 1979-09-12 AU AU50762/79A patent/AU530201B2/en not_active Ceased
- 1979-09-14 BR BR7905881A patent/BR7905881A/en not_active IP Right Cessation
- 1979-09-17 MX MX179298A patent/MX149278A/en unknown
- 1979-09-19 IN IN978/CAL/79A patent/IN151441B/en unknown
- 1979-09-19 CA CA335,962A patent/CA1102846A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AT365758B (en) | 1982-02-10 |
| DE2840648B2 (en) | 1981-06-19 |
| NL187452B (en) | 1991-05-01 |
| AU530201B2 (en) | 1983-07-07 |
| IN151441B (en) | 1983-04-23 |
| ATA531179A (en) | 1981-06-15 |
| DE2840648A1 (en) | 1980-03-20 |
| NL187452C (en) | 1991-10-01 |
| AU5076279A (en) | 1981-03-19 |
| DE2840648C3 (en) | 1982-02-18 |
| MX149278A (en) | 1983-10-07 |
| NL7906283A (en) | 1980-03-21 |
| BR7905881A (en) | 1980-05-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |