GB2051279A - Improvements in or Relating to Couplings - Google Patents
Improvements in or Relating to Couplings Download PDFInfo
- Publication number
- GB2051279A GB2051279A GB7920941A GB7920941A GB2051279A GB 2051279 A GB2051279 A GB 2051279A GB 7920941 A GB7920941 A GB 7920941A GB 7920941 A GB7920941 A GB 7920941A GB 2051279 A GB2051279 A GB 2051279A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thread
- screw thread
- coupling
- body part
- couplings
- 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.)
- Granted
Links
- 230000008878 coupling Effects 0.000 title claims abstract description 46
- 238000010168 coupling process Methods 0.000 title claims abstract description 46
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 46
- 230000013011 mating Effects 0.000 claims description 6
- 238000001746 injection moulding Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 239000012858 resilient material Substances 0.000 claims description 2
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
- 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
- F16L37/10—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using a rotary external sleeve or ring on one part
- F16L37/101—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using a rotary external sleeve or ring on one part in which the coupling is coaxial with the pipe
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bolts, Nuts, And Washers (AREA)
Abstract
The invention relates to a quickly detachable self locking coupling which is simpler and cheaper to produce than other self locking couplings such as bayonet couplings and couplings using separate spring loaded ratchet devices or interference fits. The coupling comprises male 12 and female 10 screw threaded bodies, the thread on the male body having a step 20 along its length, and the thread inside the female body consisting of only one turn of 360 degrees with flat ends. The parts are screwed together until the end of the thread in the female body rides over the step 20 in the thread of the male body. A rubber ring 24 then urges the threads together so that inadvertent unscrewing of the bodies is inhibited. <IMAGE>
Description
SPECIFICATION
Improvements in or Relating to Couplings
This invention relates to couplings and more particularly to couplings which can be readily connected and disconnected and include means for locking the coupling to prevent inadvertent disconnection thereof.
Examples of such couplings are bayonet type couplings and systems using spring loaded ratchet devices and interference fits.
it is an object of the present invention to provide a coupling which is simpler and cheaper to produce than previous known couplings.
According to the present invention a coupling comprises two cylindrical bodies, one having an external screw thread and the other having a mating internal screw thread, each screw thread being provided with a deformed portion, resilient means being located between the two bodies such that, when the screw threads are mated and are relatively rotated against the resilient means, the deformed portions engage and opposite relative rotation between the screw threads is inhibited.
The deformed portions may take the form of a recess in one of the screw threads and a shaped portion adapted to engage the recess in the other screw thread.
Preferably, the external screw thread is provided with a step intermediate of its ends.
The internal screw thread preferably comprises one complete pitch of thread only, the end of the thread being adapted to engage the step in the external screw thread after a predetermined amount of relative rotation between the screw threads.
Preferably, the resilient means comprises a resilient ring located between the two bodies.
An embodiment of the invention will now be described by way of example only with reference to the accompanying drawings in which:~
Figure 1 is a cross-sectional view of one body part of a coupling according to the present invention,
Figure 2 is a side view of another body part of the coupling, and,
Figure 3 is a cross-sectional view of the assembled coupling.
The coupling comprises basically two body parts 10 and 12. The body part 10 is a hollow cylinder with one complete pitch of internal screw thread 13 only, i.e. extending over only 3600. The thread is of square section and the ends 14 and 16 finish abruptly with flat ends. The exterior of the body part 10 is formed with a series of flats so that a suitable tool such as a spanner can be used to rotate the body part 10.
The body part 12 also consists of a hollow cylinder, this time with an external screw thread 1 8, also of square section and adapted to mate with the thread 13 in the body part 10. The axial width of the square section thread 18 however is not constant, but changes abruptly at a step 20 (shown in broken lines in Figure 2) to a narrower
section a portion of the way along the thread. A
flange 22 is formed on the outer surface of the
body part 12.
To secure the two body parts together a rubber
ring 24 is fitted over the body part 12 until it
abuts the flange 22 and the body part 10 is fitted
over the thread 18 and rotated so that the threads
13 and 18 mate. As the part 10 is rotated the
rubber ring 24 is compressed and after a
predetermined number of rotations the end 16 of
the screw thread 13 rides over the step 20 formed
in the thread 13. It will be seen that the action of
the rubber ring 24 urges the part 10 away from
the flange 22 and the screw thread 13 is thus
forced into contact with the right-hand side of the
narrower part of the screw thread 18. The body
part 10 cannot then be rotated in the opposite
direction since the end 16 of the screw thread 13
contacts the step 20 and the body parts are
effectively locked together.
Releasing the body part 10 involves
compressing the rubber ring 24 by pressing the
parts 10 and 12 together until the end 1 6 of the
screw thread 13 can ride over the step 20. The
body part 10 can then be unscrewed in a
conventional manner.
The body parts 10 and 12 may be formed from
plastics material complete with the screw threads
and thus can be made simply and cheaply by
injection moulding.
The rubber ring 24 also acts to seal the
coupling but a metal spring or other resilient
material could be used.
The length of the thread 13 and the position of the step 20 may be varied to give the required locking force. Furthermore, the step 20 and the end 1 6 of the thread 13 can be changed to suitable mating shapes.
Claims
1. A coupling consisting of two cylindrical bodies, one having an external screw thread and the other having a mating internal screw thread, each screw thread being provided with a deformed portion, resilient means being located between the two bodies such that when the screw threads are mated and are relatively rotated against the resilient means the deformed portions engage and opposite relative rotation between the screw threads is inhibited.
2. A coupling as claimed in claim 1 in which the deformed portions take the form of a recess in one of the screw threads, and a shape portion adapted to engage the recess in the other screw thread.
3. A coupling as claimed in claim 1 or claim 2 in which the external screw thread is provided with a step intermediate of its end.
4. A coupling as claimed in claim 3 in which the internal screw thread comprises one complete pitch of thread only, the end of the thread being adapted to engage the step in the external screw thread after a predetermined amount of relative rotation between the screw threads.
5. A coupling as claimed in any preceding
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (7)
1. A coupling consisting of two cylindrical bodies, one having an external screw thread and the other having a mating internal screw thread, each screw thread being provided with a deformed portion, resilient means being located between the two bodies such that when the screw threads are mated and are relatively rotated against the resilient means the deformed portions engage and opposite relative rotation between the screw threads is inhibited.
2. A coupling as claimed in claim 1 in which the deformed portions take the form of a recess in one of the screw threads, and a shape portion adapted to engage the recess in the other screw thread.
3. A coupling as claimed in claim 1 or claim 2 in which the external screw thread is provided with a step intermediate of its end.
4. A coupling as claimed in claim 3 in which the internal screw thread comprises one complete pitch of thread only, the end of the thread being adapted to engage the step in the external screw thread after a predetermined amount of relative rotation between the screw threads.
5. A coupling as claimed in any preceding claim in which the resilient means comprises a resilient ring located between the two bodies.
6. A coupling as claimed in claim 5 in which the resilient ring is made of rubber.
7. A coupling constructed and adapted to operate substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7920941A GB2051279B (en) | 1979-06-15 | 1979-06-15 | Couplings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7920941A GB2051279B (en) | 1979-06-15 | 1979-06-15 | Couplings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2051279A true GB2051279A (en) | 1981-01-14 |
| GB2051279B GB2051279B (en) | 1983-08-10 |
Family
ID=10505878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7920941A Expired GB2051279B (en) | 1979-06-15 | 1979-06-15 | Couplings |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2051279B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2337312A (en) * | 1996-03-04 | 1999-11-17 | British Gas Plc | Joining together pipe ends in pipe laying |
| CN114962816A (en) * | 2022-03-30 | 2022-08-30 | 崔洋 | High-performance waterproof sealing device |
-
1979
- 1979-06-15 GB GB7920941A patent/GB2051279B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2337312A (en) * | 1996-03-04 | 1999-11-17 | British Gas Plc | Joining together pipe ends in pipe laying |
| CN114962816A (en) * | 2022-03-30 | 2022-08-30 | 崔洋 | High-performance waterproof sealing device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2051279B (en) | 1983-08-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |