US20060071001A1 - Removable closure and method - Google Patents
Removable closure and method Download PDFInfo
- Publication number
- US20060071001A1 US20060071001A1 US10/954,960 US95496004A US2006071001A1 US 20060071001 A1 US20060071001 A1 US 20060071001A1 US 95496004 A US95496004 A US 95496004A US 2006071001 A1 US2006071001 A1 US 2006071001A1
- Authority
- US
- United States
- Prior art keywords
- oblong plate
- oblong
- plug member
- plug
- plate
- 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.)
- Abandoned
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
Definitions
- This invention concerns removable closures for use in closing an entrance into a chamber or other opening.
- nitrogen springs are sealed cylinders containing pressurized nitrogen gas, which is compressed by a piston connected to a rod, in turn driven by movement of the cam slide.
- the nitrogen spring is received in a chamber in the cam slide.
- nitrogen springs While capable of generating high forces, nitrogen springs do require some occasional maintenance and replacement more often than mechanical springs.
- chambers used to hold nitrogen springs have been closed by threaded plugs so as to allow convenient access to the nitrogen spring for maintenance or replacement of the nitrogen springs.
- the plug is engaged by the nitrogen spring cylinder component such that the plug threads are loaded by the high forces generated during machine operation. Such presses are cycled over many thousands of cycles so that loosening of the threaded connection may result.
- a closure comprised of a plug assembly including a plug member having wrenching surfaces such as a hex shape formed on one end, the plug assembly also including a pair of oblong plates mounted on the other end of the plug member.
- the other end of the plug member has an intermediate threaded section adjacent thereto.
- a first one of the oblong plates has a threaded mounting hole and is threaded onto the threaded section of the plug member into tight abutment with a shoulder formed thereon, a locking washer also preferably installed abutting the shoulder.
- the second oblong plate is fixed to the plug member other end, and is assembled so as to extend crosswise to the first oblong plate and is welded to the plug member end in that orientation.
- the plug assembly is designed to mate with a specially shaped receptacle at the entrance of the chamber nitrogen spring receiving chamber.
- the receptacle comprises a stepped diameter opening including a smaller diameter outer bore and an adjacent larger diameter bore, together defining a rim and an adjacent groove.
- a pair of opposing slot openings are machined through the rim, sized to receive the ends of the oblong plates allowing the second oblong plate to pass into the groove which is configured to allow the second oblong plate to be rotated therein.
- the plug member is turned counterclockwise as with a wrench to rotate the second oblong plate into alignment with the first oblong plate.
- the plug assembly is then aligned with the receptacle slots and fully advanced therein, causing the second oblong plate to move completely into the groove while the first oblong plate remains within the rim openings to be prevented from rotating.
- the wrenching end of the plug member is rotated back to rotate the second oblong plate out of alignment with the slot openings and the first oblong plate, this also retightening the threads.
- the nitrogen spring directly bears on the second oblong plate which transmits the thrust directly into the inside wall of the rim rather than loading the threaded connection between the plug member and the first oblong plate so that cycling of the load does not produce any tendency to loosen the threads.
- the first oblong plate, disposed in the slot openings and frictionally locked to the second oblong plate prevents rotation of the second oblong plate to keep it from rotating into alignment with the slot openings and maintaining it abutting the rim.
- the closure may be readily removed from the receptacle by rotating the plug member to loosen the threads and bring the second oblong plate back into alignment with the slot openings, which allows the plug assembly to be pulled from the receptacle.
- FIG. 1 is a pictorial fragmentary view of a cam slide partially broken away showing a receptacle formed therein into which the plug assembly shown displaced therefrom, is to be inserted.
- FIG. 2 is an exploded view of the plug assembly shown in FIG. 1 .
- FIG. 3 is a pictorial view of a plug assembly in its initially assembled and locking condition.
- FIG. 4 is a fragmentary pictorial view of a cam slide with the plug assembly inserted into the receptacle.
- FIG. 5 is a partially sectional fragmentary view of a housing for a nitrogen spring with a plug assembly inserted and locked therein.
- FIG. 5A is a partially sectional fragmentary view of the installed plug assembly, the nitrogen spring partially shown in phantom lines in position against one of the oblong plates included in the plug assembly.
- FIG. 6 is a sectional view of a receptacle for mating with the plug assembly.
- FIG. 6A is an end view of the receptacle shown in FIG. 6 .
- FIG. 1 shows a cam slide 10 in a forming die of a type well known in the art, which has a chamber 12 for receiving a high force nitrogen spring (not shown in FIG. 1 ).
- the cam slide 10 is driven laterally by the action of a cam surface when a press lowers the cam slide into a mating driver (not shown) in the well known manner.
- the spring is used to return the cam slide as the press retracts the cam slide 10 .
- the entrance to the chamber 12 is configured as a receptacle 14 to receive and mate with a plug assembly 16 to form the closure according to the present invention.
- the plug assembly 16 includes a plug member 18 formed with a hex shape 20 at one end to provide wrenching surfaces.
- the opposite end of the plug member is formed as a smooth cylindrical pin 22 sized to be slidably received through a threaded bore 24 in a first oblong plate 26 and pressed into a centrally located bore 28 in a second oblong plate 30 ( FIG. 2 ).
- the plug member 18 is further formed with an intermediate external thread section 32 mating with the internal threads in a centrally located bore 24 in the first oblong plate 26 .
- a diameter 34 of the plug 18 has a locking washer 26 receiving thereover and abutting an adjacent 30 shoulder 35 .
- the components of the plug assembly 16 are assembled together by first placing the lock washer 36 onto the diameter 34 and against the shoulder 35 , and then threading the section 32 into the threaded bore 24 in the first oblong plate 26 until firmly tightened against the washer 32 as by using the wrenching surfaces comprised of the hex shaped end 20 .
- the second oblong plate 30 is assembled onto the pin end 24 in the crosswise orientation with respect to the first oblong plate 26 as shown in FIGS. 2 and 3 , and plug welded thereto to fix the same in that orientation.
- the first oblong plate 26 is held while the plug member 18 is rotated counterclockwise a quarter turn so that the second oblong plate 30 is parallel and aligned with the first oblong plate 26 as seen in FIG. 1 . This loosens the threaded connection with the first oblong plate 26 .
- the receptacle 14 comprises an outside smaller diameter bore substantially smaller than the length of the second oblong plate 30 and a larger diameter bore 40 axially adjacent thereto, slightly larger than the length of the second oblong plate 30 , together forming an inwardly extending rim 38 at the entrance of the receptacle 14 , defined on its inside by one side of a groove 48 .
- the rim 38 is formed with a pair of opposing slot openings 42 extending axially through the rim 38 and which extend radially outward a distance equal to the diameter of the groove 40 .
- the first oblong plate 26 and the second oblong plate 30 are of a length and width to just pass cross ways through the bore within the rim 30 when aligned with the slot openings 42 which the ends of the plates 26 , 30 are fit.
- the second oblong plate 30 is of a similar length and is rotatable in the groove 40 , the rounded ends thereof generally conforming to the curvature of groove 40 to facilitate rotation in the groove 40 .
- the slot openings 42 are configured to allow the ends of the second oblong plate 30 when aligned with the first oblong plate 26 to be inserted into the receptacle 14 to pass through the rim 38 and into the groove 40 which is deep enough to just accommodate the thickness of the second oblong plate 30 as seen in FIG. 5 , with a slight axial clearance as shown to insure that it may be rotated in the groove 40 .
- the groove 40 is sufficient such that the first oblong plate 26 protrudes very slightly into the groove 40 , to insure that the second oblong plate 30 completely enters groove 40 .
- the ends of the second oblong plate 30 are rounded to match the diameter of the slot 40 to allow rotation of the second oblong plate 26 within the groove 40 .
- each end of the second oblong plate 30 is relieved to insure that the second oblong plate 30 may be easily rotated in the groove 40 .
- the hex end 20 of the plug member 18 is rotated a quarter turn, rotating the second oblong plate 30 out of alignment with the slot openings 42 and to be oriented crosswise to the first oblong plate 26 .
- the threaded section 32 is not loaded when a nitrogen spring 46 abuts the second oblong plate 30 , as this drives the second oblong plate 30 against one side of the groove 40 as seen in FIG. 5A , so that the rim 38 absorbs the axial load.
- cycling of the load does not impose any forces on the threads connecting the first oblong plate 26 and plug member 18 , and this eliminates any tendency to loosen the connection.
- the plug member 18 can be readily loosened when desired as with a wrench to rotate the second oblong plate 30 back into alignment with the slot openings 42 and allow removal of the plug assembly 16 and access to the nitrogen spring 46 for maintenance or replacement.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
Abstract
Description
- This invention concerns removable closures for use in closing an entrance into a chamber or other opening.
- In certain forming press installations, very high spring forces are needed to return cam slides used to perform an operation on a part being formed. The high force levels required to return the cam slide have led to the development of “nitrogen springs”, which are sealed cylinders containing pressurized nitrogen gas, which is compressed by a piston connected to a rod, in turn driven by movement of the cam slide. The nitrogen spring is received in a chamber in the cam slide.
- While capable of generating high forces, nitrogen springs do require some occasional maintenance and replacement more often than mechanical springs.
- Thus, chambers used to hold nitrogen springs have been closed by threaded plugs so as to allow convenient access to the nitrogen spring for maintenance or replacement of the nitrogen springs.
- The plug is engaged by the nitrogen spring cylinder component such that the plug threads are loaded by the high forces generated during machine operation. Such presses are cycled over many thousands of cycles so that loosening of the threaded connection may result.
- It is the object of the present invention to provide a readily removable closure capable of resisting very large forces repeated over large numbers of cycles without loosening.
- The above recited object as well as other objects which will become apparent upon a reading of the specification and claims are achieved by a closure comprised of a plug assembly including a plug member having wrenching surfaces such as a hex shape formed on one end, the plug assembly also including a pair of oblong plates mounted on the other end of the plug member. The other end of the plug member has an intermediate threaded section adjacent thereto. A first one of the oblong plates has a threaded mounting hole and is threaded onto the threaded section of the plug member into tight abutment with a shoulder formed thereon, a locking washer also preferably installed abutting the shoulder.
- The second oblong plate is fixed to the plug member other end, and is assembled so as to extend crosswise to the first oblong plate and is welded to the plug member end in that orientation.
- The plug assembly is designed to mate with a specially shaped receptacle at the entrance of the chamber nitrogen spring receiving chamber. The receptacle comprises a stepped diameter opening including a smaller diameter outer bore and an adjacent larger diameter bore, together defining a rim and an adjacent groove. A pair of opposing slot openings are machined through the rim, sized to receive the ends of the oblong plates allowing the second oblong plate to pass into the groove which is configured to allow the second oblong plate to be rotated therein.
- To install the plug assembly in the receptacle, the plug member is turned counterclockwise as with a wrench to rotate the second oblong plate into alignment with the first oblong plate. The plug assembly is then aligned with the receptacle slots and fully advanced therein, causing the second oblong plate to move completely into the groove while the first oblong plate remains within the rim openings to be prevented from rotating. The wrenching end of the plug member is rotated back to rotate the second oblong plate out of alignment with the slot openings and the first oblong plate, this also retightening the threads.
- The nitrogen spring directly bears on the second oblong plate which transmits the thrust directly into the inside wall of the rim rather than loading the threaded connection between the plug member and the first oblong plate so that cycling of the load does not produce any tendency to loosen the threads.
- The first oblong plate, disposed in the slot openings and frictionally locked to the second oblong plate prevents rotation of the second oblong plate to keep it from rotating into alignment with the slot openings and maintaining it abutting the rim. Thus, the closure may be readily removed from the receptacle by rotating the plug member to loosen the threads and bring the second oblong plate back into alignment with the slot openings, which allows the plug assembly to be pulled from the receptacle.
-
FIG. 1 is a pictorial fragmentary view of a cam slide partially broken away showing a receptacle formed therein into which the plug assembly shown displaced therefrom, is to be inserted. -
FIG. 2 is an exploded view of the plug assembly shown inFIG. 1 . -
FIG. 3 is a pictorial view of a plug assembly in its initially assembled and locking condition. -
FIG. 4 is a fragmentary pictorial view of a cam slide with the plug assembly inserted into the receptacle.FIG. 5 is a partially sectional fragmentary view of a housing for a nitrogen spring with a plug assembly inserted and locked therein. -
FIG. 5A is a partially sectional fragmentary view of the installed plug assembly, the nitrogen spring partially shown in phantom lines in position against one of the oblong plates included in the plug assembly. -
FIG. 6 is a sectional view of a receptacle for mating with the plug assembly. -
FIG. 6A is an end view of the receptacle shown inFIG. 6 . - In the following detailed description, certain specific terminology will be employed for the sake of clarity and a particular embodiment described in accordance with the requirements of 35 USC 112, but it is to be understood that the same is not intended to be limiting and should not be so construed inasmuch as the invention is capable of taking many forms and variations within the scope of the appended claims.
- Referring to the drawings,
FIG. 1 shows acam slide 10 in a forming die of a type well known in the art, which has achamber 12 for receiving a high force nitrogen spring (not shown inFIG. 1 ). Thecam slide 10 is driven laterally by the action of a cam surface when a press lowers the cam slide into a mating driver (not shown) in the well known manner. The spring is used to return the cam slide as the press retracts thecam slide 10. - The entrance to the
chamber 12 is configured as areceptacle 14 to receive and mate with aplug assembly 16 to form the closure according to the present invention. - The
plug assembly 16 includes aplug member 18 formed with ahex shape 20 at one end to provide wrenching surfaces. - The opposite end of the plug member is formed as a smooth
cylindrical pin 22 sized to be slidably received through a threadedbore 24 in a firstoblong plate 26 and pressed into a centrally locatedbore 28 in a second oblong plate 30 (FIG. 2 ). - The
plug member 18 is further formed with an intermediateexternal thread section 32 mating with the internal threads in a centrally locatedbore 24 in the firstoblong plate 26. - A
diameter 34 of theplug 18 has alocking washer 26 receiving thereover and abutting an adjacent 30shoulder 35. - The components of the
plug assembly 16 are assembled together by first placing thelock washer 36 onto thediameter 34 and against theshoulder 35, and then threading thesection 32 into the threadedbore 24 in the firstoblong plate 26 until firmly tightened against thewasher 32 as by using the wrenching surfaces comprised of the hex shapedend 20. - The second
oblong plate 30 is assembled onto thepin end 24 in the crosswise orientation with respect to the firstoblong plate 26 as shown inFIGS. 2 and 3 , and plug welded thereto to fix the same in that orientation. - To prepare for installation, the first
oblong plate 26 is held while theplug member 18 is rotated counterclockwise a quarter turn so that the secondoblong plate 30 is parallel and aligned with the firstoblong plate 26 as seen inFIG. 1 . This loosens the threaded connection with the firstoblong plate 26. - The
receptacle 14 comprises an outside smaller diameter bore substantially smaller than the length of the secondoblong plate 30 and a larger diameter bore 40 axially adjacent thereto, slightly larger than the length of the secondoblong plate 30, together forming an inwardly extendingrim 38 at the entrance of thereceptacle 14, defined on its inside by one side of a groove 48. - The
rim 38 is formed with a pair ofopposing slot openings 42 extending axially through therim 38 and which extend radially outward a distance equal to the diameter of thegroove 40. - The first
oblong plate 26 and the secondoblong plate 30 are of a length and width to just pass cross ways through the bore within therim 30 when aligned with theslot openings 42 which the ends of theplates oblong plate 30 is of a similar length and is rotatable in thegroove 40, the rounded ends thereof generally conforming to the curvature ofgroove 40 to facilitate rotation in thegroove 40. - The
slot openings 42 are configured to allow the ends of the secondoblong plate 30 when aligned with the firstoblong plate 26 to be inserted into thereceptacle 14 to pass through therim 38 and into thegroove 40 which is deep enough to just accommodate the thickness of the secondoblong plate 30 as seen inFIG. 5 , with a slight axial clearance as shown to insure that it may be rotated in thegroove 40. - The
groove 40 is sufficient such that the firstoblong plate 26 protrudes very slightly into thegroove 40, to insure that the secondoblong plate 30 completely entersgroove 40. - The ends of the second
oblong plate 30 are rounded to match the diameter of theslot 40 to allow rotation of the secondoblong plate 26 within thegroove 40. - The leading
sides 44 of each end of the secondoblong plate 30 is relieved to insure that the secondoblong plate 30 may be easily rotated in thegroove 40. - The
hex end 20 of theplug member 18 is rotated a quarter turn, rotating the secondoblong plate 30 out of alignment with theslot openings 42 and to be oriented crosswise to the firstoblong plate 26. - This same rotation cause threads on the
plug member 18 to again be fully tightened against the firstoblong plate 42, this tightening creating a frictional lock preventing rotation of the firstoblong plate 26 on theplug member 18. This lock in turn prevents the secondoblong plate 30 from rotating back into alignment with theopenings 42, since theplug member 18 cannot rotate because the firstoblong plate 26 is prevented from rotating by its being fit into theslot openings 42. Thus, movement of theplug assembly 16 out of thereceptacle 14 is prevented until theplug 18 member is loosened as with a wrench. - The threaded
section 32 is not loaded when anitrogen spring 46 abuts the secondoblong plate 30, as this drives the secondoblong plate 30 against one side of thegroove 40 as seen inFIG. 5A , so that therim 38 absorbs the axial load. Thus, cycling of the load does not impose any forces on the threads connecting the firstoblong plate 26 and plugmember 18, and this eliminates any tendency to loosen the connection. At the same time, theplug member 18 can be readily loosened when desired as with a wrench to rotate the secondoblong plate 30 back into alignment with theslot openings 42 and allow removal of theplug assembly 16 and access to thenitrogen spring 46 for maintenance or replacement.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/954,960 US20060071001A1 (en) | 2004-09-29 | 2004-09-29 | Removable closure and method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/954,960 US20060071001A1 (en) | 2004-09-29 | 2004-09-29 | Removable closure and method |
Publications (1)
Publication Number | Publication Date |
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US20060071001A1 true US20060071001A1 (en) | 2006-04-06 |
Family
ID=36124530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/954,960 Abandoned US20060071001A1 (en) | 2004-09-29 | 2004-09-29 | Removable closure and method |
Country Status (1)
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US (1) | US20060071001A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115837396A (en) * | 2022-11-08 | 2023-03-24 | 恩森(台州)化学有限公司 | Melting furnace is retrieved to plastics plated item |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2839808A (en) * | 1956-02-15 | 1958-06-24 | Victor F Zahodiakin | Fastening devices |
US2900697A (en) * | 1955-04-05 | 1959-08-25 | Cuss John Freeman | Fasteners for panels and the like |
US2907418A (en) * | 1954-01-19 | 1959-10-06 | Douglas Aircraft Co Inc | High shear strength fastener |
US2922211A (en) * | 1955-10-04 | 1960-01-26 | Illinois Tool Works | Quick fastener unit |
US3203063A (en) * | 1963-02-21 | 1965-08-31 | Camloc Fastener Corp | Rotatable stud fastener |
-
2004
- 2004-09-29 US US10/954,960 patent/US20060071001A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2907418A (en) * | 1954-01-19 | 1959-10-06 | Douglas Aircraft Co Inc | High shear strength fastener |
US2900697A (en) * | 1955-04-05 | 1959-08-25 | Cuss John Freeman | Fasteners for panels and the like |
US2922211A (en) * | 1955-10-04 | 1960-01-26 | Illinois Tool Works | Quick fastener unit |
US2839808A (en) * | 1956-02-15 | 1958-06-24 | Victor F Zahodiakin | Fastening devices |
US3203063A (en) * | 1963-02-21 | 1965-08-31 | Camloc Fastener Corp | Rotatable stud fastener |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115837396A (en) * | 2022-11-08 | 2023-03-24 | 恩森(台州)化学有限公司 | Melting furnace is retrieved to plastics plated item |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: IEM, DANLEY, MASSACHUSETTS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHUN, VICTOR L.;MADEJ, FRANK;REEL/FRAME:016095/0085;SIGNING DATES FROM 20041123 TO 20041124 |
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AS | Assignment |
Owner name: DANLY IEM LLC, MASSACHUSETTS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CONNELL LIMITED PARTNERSHIP;REEL/FRAME:016323/0084 Effective date: 20050302 |
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AS | Assignment |
Owner name: FLEET CAPITAL CORPORATION, MASSACHUSETTS Free format text: SECURITY INTEREST;ASSIGNOR:DANLY IEM, LLC;REEL/FRAME:015851/0839 Effective date: 20050304 |
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AS | Assignment |
Owner name: NEWSTAR FINANCIAL, INC., MASSACHUSETTS Free format text: SECURITY AGREEMENT;ASSIGNOR:DANLY IEM, INC.;REEL/FRAME:015918/0921 Effective date: 20050302 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |
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AS | Assignment |
Owner name: DANLY IEM, LLC, MASSACHUSETTS Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:NEWSTAR FINANCIAL, INC.;REEL/FRAME:029212/0497 Effective date: 20071228 |