US3473693A - Pressure chamber cover latch - Google Patents
Pressure chamber cover latch Download PDFInfo
- Publication number
- US3473693A US3473693A US3473693DA US3473693A US 3473693 A US3473693 A US 3473693A US 3473693D A US3473693D A US 3473693DA US 3473693 A US3473693 A US 3473693A
- Authority
- US
- United States
- Prior art keywords
- linkage
- bridge
- cover
- latch member
- pivot
- 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 - Lifetime
Links
Images
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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J13/00—Covers or similar closure members for pressure vessels in general
- F16J13/16—Pivoted closures
- F16J13/20—Pivoted closures mounted by mobile fastening on swinging arms
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S292/00—Closure fasteners
- Y10S292/69—Washing machine or stove closure latch
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T292/00—Closure fasteners
- Y10T292/08—Bolts
- Y10T292/0911—Hooked end
- Y10T292/0913—Sliding and swinging
- Y10T292/0914—Operating means
- Y10T292/0917—Lever
Definitions
- An operating handle has a detent connection with the linkage and if the separation force is nearly zero the handle is capable of returning the pivot connection past center for release expansion of the linkage. If the separation force is of hazardous magnitude, however, the detent connection yields to make the handle inoperative.
- a problem is to construct an efiicient contractible latch mechanism.
- a second problem is to provide such a latch mechanism that is reliable, it being especially essential that the latch mechanism be nonresponsive to the separation force between the pressure vessel and the cover.
- a third problem is to provide some safeguard to prevent inadvertent release of the latch mechanism while the vessel is under high gaseous pressure.
- the present invention is directed to the solution of these problems.
- the pressure vessel is a sterilizer for such articles as instruments used by surgeons and dentists, the sterilizer employing a vaporized germicide under pressure.
- the cover for the sterilizer tank is held under pressure against a resilient sealing gasket and for this purpose the cover is mounted on a bridge that extends across the cover.
- One end of the bridge is hinged to the pressure vessel with the direction of the hinge axis perpendicular to the direction of the axis of the pressure tank.
- the middle of the cover is connected to the bridge by the equivalent of a universal joint and for this purpose a stud fixedly extending from the middle of the cover threads into the equivalent of a ball member that is captivated by the bridge.
- the swingable end of the bridge is releasably connectible to the pressure vessel by a contractible latch mechanism that is constructed in accord with the teachings of the present invention.
- the swingable end of the bridge is slotted to form a clevis, the slot being spanned by a transverse pivot pin, the axis of which is transverse to the direction of the separation force between the pressure vessel and the bridge.
- the relatively short link is pivotally mounted on the transverse pivot pin and is adapted to releasably engage a fixed element in the form of a fixed pin on the pressure vessel.
- the contractible latch mechanism comprises a relatively short link in combination with a latch member, which latch member has a base portion and an integral hook arm that forms a hook seat for releasable engagement with the fixed pin on the pressure vessel.
- One end of the relatively short link is pivotally mounted on the transverse pivot pin at the end of the bridge member and the other end of the link is connected to the base portion of the latch member by a suitable pivot connection.
- the link and the latch member form a linkage that functions in the manner of a toggle linkage, the linkage being movable past center into contracted locking position.
- transverse pivot pin on the bridge and the fixed pin on the vessel define a line along the direction of the separation force and the pivot connection of the link with the latch member is at a past-center position to one side of the extension of this line thereby locking the linkage in its contracted state.
- a suitable operating handle is pivotally mounted on the base portion of the latch member.
- the handle is yieldingly connected to the latch member by detent means. If the vessel is under high pressure, any attempt to manipulate the handle to release the latch mechanism simply results in yielding of the detent means to make the handle inoperative.
- An important feature of the invention is that the contraction of the linkage is utilized to place the sealing gasket of the cover under eifective sealing pressure.
- the screw thread connection between the cover and the bridge is adjusted and readjusted as necessary so that the sealing pressure against the cover gasket is accomplished solely by the contraction of the linkage.
- FIG. 1 is a sectional view of the pressure vessel cover and bridge showing the linkage or latch mechanism in its contracted state for interconnecting the vessel and the swingable end of the bridge;
- FIG. 2 is a fragmentary view similar to FIG. 1 showing the handle swung to a position to release the swingable end of the bridge from the pressure vesel;
- FIG. 3 is a similar view showing the continuation of the release operation to free the hook seat of the linkage from the pressure vessel;
- FIG. 4 is a section through the bridge along the line 44 of FIG. 1;
- FIG. 5 is a view of the latch mechanism as seen along the angular line 44 of FIG. 1;
- FIG. 6 is an exploded view of the latch mechanism.
- FIG. 1 shows the front end of a pressure tank, generally designated 10, which is in horizontal position with the forward end of the tank closed by a dished cover 12.
- the circumferential margin of the cover 12 lies against a sealing gasket or ring 14 that seats in the circular groove 15, the sealing ring being normally compressed by the cover to prevent leakage of the high pressure gaseous fluid.
- a bridge, generally designated 16 is pivotally connected at one of its ends to the pressure vessel and the swingable end of the bridge carries a latch mechanism in the form of a linkage that is generally designated by the numeral 18.
- the pivoted end of the bridge 16 is mounted on a pivot 20 that spans a clevis 22 that is rigidly connected to the pressure tank.
- a second clevis 24 that is fixedly connected to the tank opposite the other end of the bridge is spanned by a fixed element in the form of a cross pin 25 and the linkage 18 is adapted for releasable engagement with this fixed element.
- a screw threaded stud 26 having a base flange 28 is fixedly mounted on the center of the cover 12 by means of a screw 30.
- the stud 26 screws into a universal joint means comprising a metal body 32 that is mounted in a socket 34 of the bridge member 16, the socket 34 having a spherically curved surface 35 and the body 32 having a complementary spherically curved surface 36.
- the stud 26 screws into the body 32 and the body is retained in the socket 34 by a split ring 38 with an appreciable degree of freedom for the body to slide on the socket surface 36.
- the cover 12 is free to accommodate itself to the open end of the tank 10 to cause the cover to press uniformly against the gasket 14.
- the latch mechanism or linkage 18 comprises a latch member 40 and a link 42.
- the latch member 40 has what may be termed a base portion 44 and a hook portion or hook arm 45 that is formed with a hook seat 46 to releasably engage the fixed element or cross pin 25.
- the base portion 44 of the latch member 40 is provided with a slot 48 which forms two ears 50 and the two ears have aligned bores 52 and the base portion has a full width extension 54.
- the hook portion 45 which is formed with the hook seat 46 is narrower than the base portion 44 and is preferably formed with a rearward shoulder 55.
- the latch member 40 is of U- shaped configuration to permit it to straddle the link 42.
- FIG. 5 further shows that the link 42 may be made in two sections 42a and 42b that straddle a web 56 of the latch member. a
- the swingable end of the bridge 16 is slotted to form a clevis and the clevis is spanned by a fixed pivot element in the form of a cross pin 60.
- One end of the twopiece link 42 is rotatably mounted on the fixed pin element 60 and the other end of the two-piece link straddles the web 56 of the latch member and is anchored to the latch member by what may be termed a pivot connection 62 in the form of a pivot pin.
- a suitable torque spring 64 wound around the pin 62 acts :between the bridge 16 and section 42b of the link to urge the link clockwise as viewed in FIG. 1.
- one end of the torque spring is formed with a hook 65 to engage the link section 42b and the other end of the torque spring engages a small pin 66 inside the clevis of the bridge member.
- a suitable handle 68 is provided for manipulating the linkage 18 and is yieldingly connected to the linkage to limit the torque that may be transmitted from the handle to the linkage.
- the inner end of the handle extends into the slot 48 of the latch member and is pivotally connected to the latch member by a pivot pin 70 that extends through the bores 52 of the two ears 50 of the latch member.
- the inner end of the handle is curved concentrically of the pivot pin 70 and the inner end of the handle is provided with a detent recess 72 to releasably seat a detent ball 74 that is under pressure from a coiled spring 75, the ball and spring being mounted in a blind bore 76 in the latch member 40. If the separation force between the cover and the tank is of hazardous magnitude and the handle is swung in the direction to release the cover, the detent is overcome and the handle merely swings useles'sly.
- the latch member 40 is limited to a given relatively small range of rotation relative to the bridge 16 but the handle 68 may pivot through a. much larger range of rotation relative to the latch member. If the detent connection between the handle and the latch member becomes unseated, the limited range of rotation of the latch member makes it possible to reseat the detent connection by simply reversing the swing of the handle through the larger range.
- FIG. 1 shows the linkage 18 in its contracted state for interconnecting the pivot pin 60 of the bridge and the fixed element or cross pin 25 of the tank 10.
- the dotted line 80 is an extension of a solid line 82 that is defined by the axis of the fixed pin or element 25 on the tank 10 and the axis of the pivot element 60 on the bridge 16.
- the pivot connection 62 between the link 42 and the latch member 40' lies to the left of the dotted line extension 80 as viewed in FIG. 1. Since the separation force between the cover 12 and the tank is exerted between the element 25 and the element 60 and is transmitted through the pivot connection 62, it is apparent that the separation force tends to swing the link 42 clockwise with consequent tendency to shift the latch member 40 bodily to the left. Thus the separation force tends to expand the locked linkage from its contracted state.
- FIG. 2 indicates the initial release movement of the linkage in response to counterclockwise rotation of the handle 68 and FIG. 3 shows continuation of the release movement of the linkage.
- the linkage In the manipulation of the linkage at its expanded state for releasable engagement with the fixed element 25 of the tank 10 the linkage is moved in reverse from the position shown in FIG. 3 through the position shown in FIG. 2 to the position shown in FIG. 1.
- the screw adjustment of the stud 26 relative to the bridge 16 will be normally fixed but may be changed whenever desired.
- the wall of the socket 34 is formed with a radial bore 90 and a set screw 92 that is somewhat smaller in diameter than the bore is threaded through the body 32 into engagement with the threaded stud 26.
- the set screw 92 is loosened sufiiciently to permit rotation of the stud relative to the body.
- the cover 12 may then be rotated to screw the stud 26 inwardly or outwardly of the body 32.
- the set screw 92 extends into the bore 90 it interlocks the body 32 and the bridge 16 to hold the body against rotation while the screw adjustment of the stud is carried out. It is to be noted, however, that the diameter of the bore 90 is sufficiently larger than the diameter of the set screw 92 to permit the freedom of angular movement between the body 32 and the bridge 16 that is required for self-adjustment of the cover relative to the sealing geaket 14.
- the cover 12 When the device is first assembled the cover 12 is adjusted relative to the bridge 16 in this manner to cause the range of contraction of the latch mechanism to provide the sealing pressure against the gasket 14. In the event that the sealing pressure becomes inadequate in the course of time because of permanent deformation of the sealing gasket, it is a simple matter to loosen the set screw 92 to permit the cover 12 to be rotated to increase the distance of the cover from the bridge as may be necessary to cause the range of contraction of the linkage 18 to provide the desired sealing pressure against the gasket 14.
- a latch mechanism to releasable interconnect a first object and a second object to resist a separation force between the two objects, the combination of:
- a latch member having a hook portion forming a hook seat to engage said fixed element on the first object
- said link and latch member forming a linkage, said linkage being contractible to releasably interconnect the pivot element and fixed element,
- pivot element and fixed element defining a line along the direction of the separation force when the linkage is contracted
- said hook seat and said pivot connection being spaced apart with said pivot element between the hook seat and the pivot connection
- pivot connection being at a past-center position to one side of the extension of said line when the linkage is contracted whereby the separation force tends to shift the pivot connection further away from the extension of the line to expand the contracted linkage;
- stop means on said second member blocking such shift of the pivot connection thereby to keep the linkage contracted with the linkage exerting pressure against the stop means in reaction to the separation force;
- a handle for said linkage operable to shift the pivot connection in one direction across the extension of said line to contract the link and to return the pivot connection in the opposite direction across the line for releasing expansion of the linkage.
- a combination as set forth in claim 1 which includes spring means acting between the link and the latch member when the linkage is contracted to urge relative rotation of the link and the latch member in the direction to return the pivot connection past center across the extension of said line for release expansion of the linkage.
- a combination as set forth in claim 2 which includes means to limit the release expansion of the linkage.
- one of said handle and said latch member is formed with a detent recess and the other of the handle and latch member is provided with a springpressed detent member to yieldingly seat in the recess;
- said latch member is an elongated member with said hook seat at one end thereof and with said handle mounted on the other end thereof, said pivot connection being intermediate the two ends of the latch member.
- Means to releasably connect a cover to a pressure tank to resist a separation force between the cover and the tank with the cover under sealing pressure against a resilient gasket comprising:
- a latch member having a hook portion forming a hook seat to engage said fixed element on the tank;
- said link and latch member forming a linkage, said linkage being contractible to releasably interconnect the pivot element on the bridge and the fixed element on the tank,
- pivot element and fixed element defining a line along the direction of the separation force when the link-age is contracted
- said hook seat and said pivot connection being spaced apart with said pivot element between the hook seat and the pivot connection
- pivot connection being at a past-center position to one side of the extension of said line when the linkage is contracted whereby the separation force tends to shift the pivot connection further away from the extension of the line to expand the contracted linkage;
- stop means on said bridge blocking ofi such shift of the pivot connection thereby to keep the linkage contracted with the linkage exerting pressure against the stop means in reaction to the separation force; a handle for said linkage operable to shift the pivot connection in one direction across the extension or said line to contract the link and to return the pivot connection in the opposite direction across the line for releasing expansion of the linkage;
- screw means connecting said cover to said universal joint means to permit adjustment of the spacing of the cover from the bridge whereby said spacing may be adjusted by screw action to cause the contraction of the linkage to place said gasket under sealing pressure.
- a combination as set forth in claim 8 in which said handle has a yielding operating connection with the linkage, said connection yielding to a relatively low torque to make the handle inoperative in the event that the magnitude of separation force created by fluid pressure in the tank is above a predetermined relatively low magnitude when the linkage is contracted.
- screw means fixedly extends from the cover into threaded engagement with said body
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US75522468A | 1968-08-26 | 1968-08-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3473693A true US3473693A (en) | 1969-10-21 |
Family
ID=25038224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US3473693D Expired - Lifetime US3473693A (en) | 1968-08-26 | 1968-08-26 | Pressure chamber cover latch |
Country Status (1)
Country | Link |
---|---|
US (1) | US3473693A (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3734335A (en) * | 1971-06-28 | 1973-05-22 | Systron Donner Corp | Locking cabinet assembly |
US4127215A (en) * | 1978-02-06 | 1978-11-28 | Kaiser Aerospace & Electronics Corporation | Access port covering device |
US4995313A (en) * | 1988-03-15 | 1991-02-26 | Welbilt Corporation | Cooking apparatus |
US20040137779A1 (en) * | 2003-01-10 | 2004-07-15 | Chih-Sheng Wei | Connector |
US20110227350A1 (en) * | 2010-03-18 | 2011-09-22 | Thai Do | Latch with adjustable handle |
US20110278408A1 (en) * | 2010-05-17 | 2011-11-17 | Rolls-Royce Plc | Locking device |
US10240389B2 (en) | 2015-09-30 | 2019-03-26 | Arconic Inc. | Pressure relief door |
US10309126B2 (en) | 2016-01-21 | 2019-06-04 | Arconic Inc. | Pawl latch |
US10337218B2 (en) | 2015-07-08 | 2019-07-02 | Arconic Inc. | Handle mechanisms |
US10378256B2 (en) | 2015-10-30 | 2019-08-13 | Arconic Inc. | Pressure relief latch |
US10435929B2 (en) | 2015-08-26 | 2019-10-08 | Arconic Inc. | Adjustable pressure relief latch |
US10604977B2 (en) | 2015-08-04 | 2020-03-31 | Arconic Inc. | Pressure relief latch |
US10676971B2 (en) | 2016-06-13 | 2020-06-09 | Arconic Inc. | Rotary latch system |
US10760304B2 (en) | 2015-09-01 | 2020-09-01 | Howmet Aerospace Inc. | Adjustable hook latch |
US11041331B2 (en) | 2015-04-03 | 2021-06-22 | Howmet Aerospace Inc. | Latch having tool recess in trigger |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1945752A (en) * | 1931-04-17 | 1934-02-06 | Pagano Andrea Ricardo | Cam lever closing arrangement for pressure cooking pots |
US3045861A (en) * | 1959-12-01 | 1962-07-24 | Wesley E Dieter | Closure for evacuated and/or pressurized vessel |
US3325200A (en) * | 1964-04-06 | 1967-06-13 | Amerock Corp | Latch |
-
1968
- 1968-08-26 US US3473693D patent/US3473693A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1945752A (en) * | 1931-04-17 | 1934-02-06 | Pagano Andrea Ricardo | Cam lever closing arrangement for pressure cooking pots |
US3045861A (en) * | 1959-12-01 | 1962-07-24 | Wesley E Dieter | Closure for evacuated and/or pressurized vessel |
US3325200A (en) * | 1964-04-06 | 1967-06-13 | Amerock Corp | Latch |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3734335A (en) * | 1971-06-28 | 1973-05-22 | Systron Donner Corp | Locking cabinet assembly |
US4127215A (en) * | 1978-02-06 | 1978-11-28 | Kaiser Aerospace & Electronics Corporation | Access port covering device |
US4995313A (en) * | 1988-03-15 | 1991-02-26 | Welbilt Corporation | Cooking apparatus |
US20040137779A1 (en) * | 2003-01-10 | 2004-07-15 | Chih-Sheng Wei | Connector |
US6955556B2 (en) * | 2003-01-10 | 2005-10-18 | Benq Corporation | Connector for electronic device |
US20110227350A1 (en) * | 2010-03-18 | 2011-09-22 | Thai Do | Latch with adjustable handle |
US8864185B2 (en) * | 2010-03-18 | 2014-10-21 | Alcoa Inc. | Latch with adjustable handle |
US20110278408A1 (en) * | 2010-05-17 | 2011-11-17 | Rolls-Royce Plc | Locking device |
US11041331B2 (en) | 2015-04-03 | 2021-06-22 | Howmet Aerospace Inc. | Latch having tool recess in trigger |
US10337218B2 (en) | 2015-07-08 | 2019-07-02 | Arconic Inc. | Handle mechanisms |
US10604977B2 (en) | 2015-08-04 | 2020-03-31 | Arconic Inc. | Pressure relief latch |
US10435929B2 (en) | 2015-08-26 | 2019-10-08 | Arconic Inc. | Adjustable pressure relief latch |
US10760304B2 (en) | 2015-09-01 | 2020-09-01 | Howmet Aerospace Inc. | Adjustable hook latch |
US10240389B2 (en) | 2015-09-30 | 2019-03-26 | Arconic Inc. | Pressure relief door |
US10378256B2 (en) | 2015-10-30 | 2019-08-13 | Arconic Inc. | Pressure relief latch |
US10309126B2 (en) | 2016-01-21 | 2019-06-04 | Arconic Inc. | Pawl latch |
US10676971B2 (en) | 2016-06-13 | 2020-06-09 | Arconic Inc. | Rotary latch system |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: BANK OF AMERICA NATIONAL TRUST AND SAVINGS ASSOCIA Free format text: SECURITY INTEREST;ASSIGNOR:MDT CHEMICAL COMPANY A CA CORP.;REEL/FRAME:004029/0143 Effective date: 19820726 |
|
AS | Assignment |
Owner name: MDT CHEMICAL COMPANY A CA CORP. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BANK OF AMERICA NATIONAL TRUST AND SAVINGS ASSOCIATION;REEL/FRAME:004315/0310 Effective date: 19841001 |
|
AS | Assignment |
Owner name: MDT BIOLOGIC COMPANY Free format text: CHANGE OF NAME;ASSIGNOR:MDT CHEMICAL COMPANY;REEL/FRAME:004511/0351 Effective date: 19821211 |
|
AS | Assignment |
Owner name: CONGRESS FINANCIAL CORPORATION (WESTERN), A CA. CO Free format text: SECURITY INTEREST;ASSIGNOR:MDT BIOLOGIC COMPANY, A CA. CORP.;REEL/FRAME:004826/0298 Effective date: 19870702 Owner name: CONGRESS FINANCIAL CORPORATION (WESTERN), 3333 WIL Free format text: SECURITY INTEREST;ASSIGNOR:MDT BIOLOGIC COMPANY, A CA. CORP.;REEL/FRAME:004826/0298 Effective date: 19870702 |