SE538910C2 - A hydraulic or pneumatic connector having a locking mechanism - Google Patents
A hydraulic or pneumatic connector having a locking mechanism Download PDFInfo
- Publication number
- SE538910C2 SE538910C2 SE1550904A SE1550904A SE538910C2 SE 538910 C2 SE538910 C2 SE 538910C2 SE 1550904 A SE1550904 A SE 1550904A SE 1550904 A SE1550904 A SE 1550904A SE 538910 C2 SE538910 C2 SE 538910C2
- Authority
- SE
- Sweden
- Prior art keywords
- head
- collar
- swivel nut
- looking
- connector
- Prior art date
Links
- 230000013011 mating Effects 0.000 claims description 4
- 244000273618 Sphenoclea zeylanica Species 0.000 claims description 3
- 239000000463 material Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/005—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts comprising locking means for the threaded member
-
- 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
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/08—Screw-threaded joints; Forms of screw-threads for such joints with supplementary elements
-
- 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
- F16L35/00—Special arrangements used in connection with end fittings of hoses, e.g. safety or protecting devices
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/24—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
- F16B39/26—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object with spring washers fastened to the nut or bolt-head
-
- 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
- F16L2201/00—Special arrangements for pipe couplings
- F16L2201/20—Safety or protective couplings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints Allowing Movement (AREA)
- Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Description
20 25 30 35 538 910 Previous related inventions include US Patent No: 4,643,459 which covers a quick fit coupling, US Patent No: 4,583,769 for a locking assembly of a different design and US Patent Application No: 2010/0072, 745 for a device that prevents a hose or fitting from disengaging a locking fitting.
DISCLOSURE OF THE INVENTION An object of the present invention is to provide a hydraulic or pneumatic connector which has a reduced risk of being unscrewed during operation.
This object is at least to some extent solved by providing the hydraulic connector mentioned initially, Wherein the stem comprises a mid-section between the head and the hose tail. A locking collar and a spring are mounted around the midsection, and the swivel nut is positioned between the head and the locking collar. The spring urges the locking collar in a direction along the midsection towards the head, wherein the locking collar is configured to be set in two modes: l) a non-engaging mode at a pre-determined distance from the head in which the locking collar being prevented from moving towards the head such that it does not pressingly engage the swivel nut, thereby allowing the swivel nut to freely rotate relative the stem; and 2) an engaging mode in which the locking collar pressingly engages the swivel nut, locking the swivel nut from rotation relative the stem.
Preferably, in the engaging mode, the locking collar being movable along the mid- section while at the same time being prevented from rotation relative the mid- section.
The locking collar being urged by the spring to pressingly engage the swivel nut towards the head, in which engagement a locking structure of the locking collar being configured to interact with the swivel nut to prevent the swivel nut from rotation relative the locking collar. Thereby the swivel nut is locked from rotation relative the SICITI.
Preferably, the locking collar having a cut-out defined by inner walls. The inner shape of the cut-out matches the outer shape of the rnidsection in such manner that the locking collar is prevented from rotation relative the mid-section when positioned between the pre-determined distance and the head. At the same time the locking collar being movable along the rnidsection, from the pre-determined distance to the head. 10 15 20 25 30 35 40 538 910 Preferably, the inner shape of the cut-out is substantially identical to the outer shape of the midsection from the pre-determined distance to the head.
Preferably the lateral cross section of the midsection has a non-circular outer shape between the pre-determined distance and the head. The terrn non-circular outer shape means shapes where the distance to a central-axis is not the same for all points on the periphery. Preferably, the outer shape of the cross- section is constant between the pre- determined distance and the head, i.e. such that it does not change between the pre- determined distance and the head.
In one embodiment, the outer shape of the mid-section, between the pre-determíned distance and the head, corresponds to a cross-sectional shape provided by cutting off one segment from a circle.
Preferably, the outer shape of the rnidsection, between the pre-deterrnined distance and the head, corresponds to a cross-sectional shape provided cutting off two opposing and parallel segments from a circle, thereby providing two flat opposing surfaces and two curved opposing surfaces. However, many other forms of constant and non-circular outer shapes are of course conceivable.
Preferably, the midsection has a reduced cross-section portion at the pre-determined distance, the reduced cross-section portion sufficiently reduced to allow the locking collar to be turned relative the stem such that the cut-out of the locking collar can be misaligned with the outer shape of the midsection, thereby providing the non-engaging mode at pre-determined distance from the head in which the locking collar is prevented from moving towards the head.
Preferably, the locking structure includes at least one projecting grip surface arranged to mate at least one flat of the swivel nut when the locking collar is set in the engaging mode, thereby preventing the swivel nut from rotation relative the locking collar. More preferably, the locking means includes at least two projecting grip surfaces extending parallel to each other and to the stem in the direction towards the head, the projecting grip surfaces arranged to fit across two opposing flats of the swivel nut when the locking collar is set in the engaging mode, thereby preventing the swivel nut from rotation relative the locking collar. It should be noted that many other forms of locking means are conceivable. 10 15 20 25 30 35 538 910 Preferably, the spring is provided between the locking collar and a washer contained on the midsection by a retaining circlip secured in a groove at the end portion of the rnidsection facing the hose tail.
The hydraulic connector can suitably be used in a hydraulic or pneumatic apparatus.
Such apparatus can include at least one hydraulic/pneumatic motor, at least one hydraulic/pneumatic cylinder, at least one control valve, and at least one hose using the connector.
BRIEE DESCRIPTION OF THE DRAWINGS Fig. 1 shows a shows a hydraulic connector in the locked engaging mode.
Fig. 2 shows a shows a hydraulic connector in the un-locked non-engaging mode.
Fig 3A shows a 3D view of the stem section of the hydraulic connector.
Eig. 3B shows a 2D view of the stem section of the hydraulic connector.
Fig. 3C shows a cross-section of the rnidsection Fig 4 shows a locking collar of the hydraulic connector.
Fig 5 shows examples of possible configurations for the rnidsection.
Fig 6 shows an example of an altemative locking collar configuration.
DETAILED DESCRIPTION Fig 1 and 2 shows a hydraulic connector 100 comprising a swivel nut 1, a locking collar 2, a helical compression spring 3, a washer 4, a hollow stem 5, and a retaining circlip 6.
Eig. 1 & 2 demonstrate a locked engaging mode resp. an unlocked non-engaging mode.
The hollow stem 5 is shown in more detail in Fig. 3A-3C. The stem 5 has a barbed hose tail 8 (the barbs only shown in Fig. 1 and 2) to which a hose can be attached, a head 10 comprising a flange 11, and a midsection 12 between the head 10 and the tail. In the shown example the head 10 has a cone seat. A through-hole 13 runs through the stem 5 starting at a free end of the hose tail 8 and ending in an opening at the head 10. The lateral cross-section of the rnidsection 12 having a constant outer shape along its entire length apart from a machined groove 15 at an end portion of the rnidsection near the hose tail 8 and a reduced cross section portion 16 between the machined groove 15 and the head 10 at a pre-determined distance from the head 10. The outer shape of the 10 15 20 25 30 35 40 538 910 rnidsection 12 corresponds to a shape cutting off two opposing and parallel segments from a circle, providing two flat opposing surfaces 18, and two curved opposing surfaces 19. The flat surfaces 18 between the groove 15 and the hose tail 8 enabling access for a wrench.
Returning to Fig. 1, the swivel nut 1 is brought along the stem 5. The swivel nut 1 having an inner threaded section with an inner diameter larger than the outer diameter of the flange 11 and an inward projecting rim (not shown) with an inner diameter large enough to allow free rotation around the rnidsection 12 but smaller than the outer diameter of the flange 11, such that when the nut 1 is screwed on to a mating threaded male connection (not shown) the inner inward projecting rim of the nut 1 will pressingly engage the flange ll of the head 10 and thereby bringing the head 10 into engagement with the mating connection (not show).
The spring 3 is provided between the locking collar 2 and the washer 4 that is secured by a retaining circlip 6 in the groove 15. The spring 3 urging the locking collar 2 in the direction towards the head 10 of the stem 5. In the mode of Fig. 1 the spring 3 urges the locking collar 2 to engage the swivel nut 1.
The locking collar 2, shown in in more detail in Fig 4, comprises a flat body 20 having a cut-out 25 defined by inner walls 21 providing an inner shape matching the outer shape of the midsection 12. The locking collar 2 can be set in two modes, a non-engaging mode and an engaging mode.
The non-engaging mode is provided at pre-determined distance from the head 10. At the pre-determined position the reduced cross- section portion 16 is sufficiently reduced to allow the locking collar 2 to be turned relative the stem 5. Thereby the cut-out 25 of the locking collar 2 can be misaligned with the outer shape of the midsection 12 to provide the non-engaging mode of the locking collar 2 in which the locking collar 2 is urged towards the head 10 by the spring 3 but prevented from sliding towards the head 10 due to the rnisaligninent. When the locking collar 2 is set in the non-engaging mode, the swivel nut 1 is allowed to freely rotate relative the stem 5, allowing it to be screwed onto a mating male part. This non-engaging mode is shown in Fig. 2. From the non- engaging mode the locking collar 2 can be set in the engaging mode by rotating the locking collar 2 relative to the stem 5 aligning the cut-out 25 with the outer shape of the rnidsection 12. 10 15 20 25 30 35 538 910 The engaging mode is set by aligning the cut-out 25 With the outer shape of the midsection 12, such that the looking collar 2 can be moved along the mid-section 12 towards the head 10. At the same time it is prevented from rotation relative the mid- section 12 since the cut out 25 matches the outer shape of the rnidsection 12. In this mode the looking collar 2 is urged by the spring 3 to engage the swivel nut 1. Looking means, in the form of a pair of projecting grip surfaces 22 extends perpendicular from the flat body 20 at opposing sides thereof with the cut-out 25 centered in-between. The projecting grip surfaces 22 extending parallel to each other and to the stem 5 in the direction towards the head 10. The projeoting grip surfaces 22 arranged to fit across two opposing flats of the swivel nut 1 when the looking collar is set in the engaging mode, thereby preventing the swivel nut 1 from rotation relative the looking collar 2. If the grip surfaces 22 do not immediately fit across the flats of the nut l, it is simple to rotate the swivel nut l slightly until the locking collar 2 clicks into place and locks the nut l in place. This mode is shown in Fig. l.
A pair of opposite located grip wings 23 further extends from two opposing sides of the flat body 20, also with the cut-out 25 centered in-between. The grip wings 23 positioned 90 degrees shifted relative the grip surfaces 22. The grip wings 23 enables a user to push the looking collar 2 from the engaging mode, of fig l, to the reduced cross- section portion 16 and turning the looking collar 2, e.g. 90 degree, to the non-engaging mode of Fig.2.
The hydraulio oonneotor 100 is assembled by sliding the swivel nut 1 over the hose tail 8 and the rnidsection 12 of the stem 5 until the inward projecting rim engages the flange ll of the head 10. Next the looking collar 2 is slid over the hose tail 8 of the stem 5 and looating it beyond the reduced cross-section part 16 of the stem 5. Next the spring 3 is installed below the looking collar 2, followed by the washer 4 and the retaining cirolip 6 that is secured at the groove 15.
A hole may be provided in the looking collar 2 to allow tagging in oiroumstanoes such as the use of soft seal connectors where the torque needs to be oarefully controlled to avoid under or over tightening, which often leads to leaks.
The whole stem 5 should ideally be manufactured from one piece of material. The stem 5 is designed with section sizes that allow it to be stronger than assemblies that are 10 15 20 25 30 538 910 either side of it. Wherever there are reductions in the material cross-section, the tendency for stresses to be focussed at the corners of these changes in section has been reduced in this design by the use of a radius at the bottom of these sections, e.g. in the reduced cross-section portion 16 in Fig. 3A-B. As this design uses cross-sections that are significantly stronger than other parts of the connections, the choice of materials from which it is manufactured can remain as it is for the connections on either end. In the final application the spring-loaded hydraulic connector is likely to have been supplied as a pre-assembled system.
The invention can be used on flexible hoses and can be adapted for any type of hose assemblies / combination of fittings i.e. Thread interface, O-ring, Matching angle, Metal to metal or Mated angle with O-ring. In the non-engaging mode (fig. 2) the nut 1 of the screw fitting is free to rotate such that it can be tightened to the correct torque. A simple turn on of the flattened part of the stem 5 below the washer 4, causes the spring 3 to activate the locking collar 2 and the nut 1 of the fitting is effectively locked in place and cannot become unscrewed fig. 1.
Fig. 5 shows some examples of possible configurations a-e of non-circular outer shapes of the midsection 12.
Fig. 6 shows an example where the the locking collar 102 has a cut-out 125 defined by inner walls 121. The inner shape of the cut-out 125 matches the outer shape of the rnidsection 112 in such manner that the locking collar 2 is prevented from rotation relative the rnid- section 112. However, as can be seen in this embodiment the inner shape of the cut-out 125 is not identical to the outer shape of the midsection 112. In this embodiment the rnidsection 112 has two protruding profiles 130 that can match cut-out pockets 126. Hence, in this embodiment the locking collar is be aligned with the rnid- section 112 every 90 degrees.
Claims (5)
1. ) a non-engaging mode at a pre-determined distance from the head (10) in which the looking collar (2) is prevented from moving towards the head (10) such that it does not pressingly engage the swivel nut (1), thereby allowing the swivel nut to freely rotate relative the stem; and
2. ) an engaging mode in which the looking collar (2) pressingly engages the swivel nut (1) and looks the swivel nut from rotation relative the stem (5). A connector (100) according to claim 1, wherein in the engaging mode, the looking collar is movable along the mid-section (12) while at the same time being prevented from rotation relative the mid-section (12), in said mode the looking collar (2) being urged by the spring (
3. ) to pressingly engage the swivel nut (1) towards the head (10), in which engagement a looking structure (22) of the looking collar (2) being oonfigured to interaot with the swivel nut to prevent the swivel nut (1) from rotation relative the looking collar (2), thereby looking the swivel nut (1) from rotation relative the stem (5). A connector (100) according to claim 1 or 2, wherein the looking collar having a cut-out (25) defined by inner walls (21), the inner shape of the out-out (25) matches the outer shape of the midsection (12) in such manner that the looking collar (2) is prevented from rotation relative the mid-section (12) when positioned between the pre-determined distance and the head (10). 10 15 20 25 30 538 910 A connector (100) according to claim 3, wherein the inner shape of the cut-out (25) is substantially identical to the outer shape of the midsection (12) from the pre-determined distance to the head (10). A connector (100) according to any one of the preceding claims, wherein the outer shape of the midsection (12), from the pre-determined distance to the head (10), provide a lateral cross-section that is constant and non-circular. A connector (100) according to any one of claims 3-5, wherein the outer shape of the mid- section between the pre-determined distance and the head (10), corresponds to a cross- sectional shape provided by cutting off a segment from a circle. A connector (100) according to any one of claims 3-5, wherein the outer shape of the midsection (12) between the pre-determined distance and the head (10), corresponds to cross-sectional shape provided by cutting off two opposing and parallel segments from a circle, thereby providing two flat opposing surfaces (18) and two curved opposing surfaces (19). A connector (100) according to any one of claims 3-7, wherein the midsection (12) has a reduced cross-section portion (16) at the pre-determined distance, the reduced cross-section portion (16) sufficiently reduced to allow the locking collar (2) to be turned relative the stem (5) such that the cut-out (25) of the locking collar can be misaligned with the outer shape of the midsection (12) between the pre-determined distance and the head (10), thereby providing the non-engaging mode at pre-determined distance from the head (10) in which the locking collar (2) is prevented from moving towards the head (10). A connector (100) according to any one of claims 2-8, wherein the locking structure (22) includes at least one projecting grip surface (22) arranged to mate at least one flat of the swivel nut (1) when the locking collar is set in the engaging mode, thereby preventing the swivel nut (1) from rotation relative the locking collar (2). 10 10. 11. 538 910 A connector (100) according to any one of claims 2-9, Wherein the locking structure (22) includes at least two projecting grip surfaces (22) extending parallel to each other and to the stem (5) in the direction towards the head (10), the projecting grip surfaces (22) arranged to fit across two opposing flats of the swivel nut (1) when the locking collar is set in the engaging mode, thereby preventing the swivel nut (1) from rotation relative the locking collar (2). A connector (100) according to any one of clainis 1-10, Wherein the spring (3) being provided between the locking collar (2) and a washer (
4. ) contained on the midsection (12) by a retaining circlip (6) secured in a groove (1
5. ) at the end portion of the midsection (12) facing the hose tail (S). 10
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1550904A SE538910C2 (sv) | 2015-06-29 | 2015-06-29 | A hydraulic or pneumatic connector having a locking mechanism |
| PCT/SE2016/050661 WO2017003362A1 (en) | 2015-06-29 | 2016-06-29 | A hydraulic or pneumatic connector having a locking mechanism |
| EP16818345.7A EP3314153A4 (en) | 2015-06-29 | 2016-06-29 | A hydraulic or pneumatic connector having a locking mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1550904A SE538910C2 (sv) | 2015-06-29 | 2015-06-29 | A hydraulic or pneumatic connector having a locking mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE1550904A1 SE1550904A1 (sv) | 2016-12-30 |
| SE538910C2 true SE538910C2 (sv) | 2017-02-07 |
Family
ID=57608658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE1550904A SE538910C2 (sv) | 2015-06-29 | 2015-06-29 | A hydraulic or pneumatic connector having a locking mechanism |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3314153A4 (sv) |
| SE (1) | SE538910C2 (sv) |
| WO (1) | WO2017003362A1 (sv) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1691851A (en) * | 1926-10-29 | 1928-11-13 | George A Mccuean | Self-tightening pipe union |
| GB492340A (en) * | 1936-03-26 | 1938-09-16 | Rifat Avigdor | Locking device for preventing accidental loosening of separable screwed pipe joints |
| FR917287A (fr) * | 1945-07-09 | 1946-12-31 | Frein de sécurité pour assemblage d'éléments coaxiaux | |
| US2728895A (en) * | 1954-10-04 | 1955-12-27 | Whitney Blake Co | Self-locking coupling device |
| US5188398A (en) * | 1992-01-02 | 1993-02-23 | General Electric Company | Redundantly locked fluid coupling |
| FR2710715B1 (fr) * | 1993-09-29 | 1996-09-20 | Marc Jean Pierre | Verrou auto-bloquant pour canalisations. |
| US8992148B2 (en) * | 2011-09-20 | 2015-03-31 | Micro-Coax, Inc. | Locking connector |
-
2015
- 2015-06-29 SE SE1550904A patent/SE538910C2/sv not_active IP Right Cessation
-
2016
- 2016-06-29 EP EP16818345.7A patent/EP3314153A4/en not_active Withdrawn
- 2016-06-29 WO PCT/SE2016/050661 patent/WO2017003362A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| EP3314153A4 (en) | 2019-01-02 |
| SE1550904A1 (sv) | 2016-12-30 |
| EP3314153A1 (en) | 2018-05-02 |
| WO2017003362A1 (en) | 2017-01-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NUG | Patent has lapsed |