US3742754A - Gaging device for crimping machine - Google Patents

Gaging device for crimping machine Download PDF

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Publication number
US3742754A
US3742754A US00191366A US3742754DA US3742754A US 3742754 A US3742754 A US 3742754A US 00191366 A US00191366 A US 00191366A US 3742754D A US3742754D A US 3742754DA US 3742754 A US3742754 A US 3742754A
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US
United States
Prior art keywords
collet
ram
plate
die ring
bed
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
Application number
US00191366A
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English (en)
Inventor
J Jeromson
K Chen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weatherhead Co
Original Assignee
Weatherhead Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Weatherhead Co filed Critical Weatherhead Co
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Publication of US3742754A publication Critical patent/US3742754A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • B21D39/046—Connecting tubes to tube-like fittings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/10—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting fittings into hoses
    • 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
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5367—Coupling to conduit

Definitions

  • At least one side of the plate is counterbored g f l to receive a portion of the collet therein to selectively o change the final crimped sleeve diameter from that produced when the opposite side is used to engage the collet and die ring.
  • This invention relates to devices for reducing the diameter or size of cylindrical or similarly shaped parts and, in particular, relates to improvementsin such devices of the type in which the shaping tool comprises a contractible collet.
  • a principal application of a device embodying the present invention is the installation of tubular fitting assemblies on hose or tubing.
  • a metal fitting or connector is permenently secured to a hose by plastically deforming or crimping an outer sleeve of the fitting around the hose end to cause the hose to be tightly held between the outer sleeve and a fitting nipple positioned inside the hose.
  • the invention is directed to apparatus particularly suited for relatively low volume production such as for the makeup of replacement hoses in the field or at the point of use.
  • a machine of this type is provided with a fixed bed plate and a ram reciprocable towards and away from the bed.
  • a die ring or socket and a segmented collet positioned in a tapered bore of the ring are axially compressed between the bed plate and ram.
  • the segments. or jaws of the collet are thereby cammed radially inward to constrict the collet bore around a fitting sleeve until the sleeve is permanently crimped onto a hose end.
  • the ram With apparatus as disclosed inthe application of B. H. Pauly et. al., the ram must be extended and retracted over a relatively long stroke to afford adequate clearance for positioning the collet in the die ring and assembling a fitting and hose in the collet at the crimping station. Disadvantages associated with the long ram stroke include proportionately high actuator cost, long extension and retraction cycle time, and otherwise unnecessary machine bulk.
  • Apparatus in accordnace with the invention permits a collet andfitting to be assembled in the die ring at a loadingpoint outside of the crimping station and unobstructed by the ram. As a consequence, the ram need not be retracted farther than. where it provides enough clearance for the collet and die ring to be moved laterally from the loading point into the crimping station. Minimizing the ram stroke significantly reduces the cost of the ram actuator, cuts reciprocation cycle time,
  • a pressure plate is provided to evenly distribute the force of the ram to the collet segments beneath the driver slot.
  • the pressure plate is reversible side for side in the apparatus and includes gaging means for selectively limiting axial movement and, therefore, contraction of the collet in the die ring.
  • gaging means for selectively limiting axial movement and, therefore, contraction of the collet in the die ring.
  • the pressure plate may be provided in the form of an apertured disc having a flat side and a counterbored side.
  • the apparatus is arranged so that the ram stroke is limited or gaged when either side of the pressure plate abuts an opposing face of the die ring.
  • the flat side of the pressure plate moves the collet to an axial position where its trailing end face is flush with the die ring face.
  • the counterbored side with the collet extending partially into the counterbore, moves the collet to an axial position somewhat short of that determined by the flat side.
  • collet will' crimp a sleeve to a final diameter somewhat larger than that produced when the flat side of the plate is used.
  • Pressure or gage plates of varying counterbore depth may be provided to produce any desired axial movement and final sleeve diameter.
  • a common set of pressure plates may be supplied for use with collets of all sizes.
  • FIG. 1 is an elevational, sectional view of a collet crimping apparatus in accordance with the invention and illustrating a die ring, collet and pressure plate in a loading position;
  • FIG. 2 is an elevational, sectional view of the collet crimping apparatus with the die ring at a crimping stapressure plate.
  • FIG. 1 illustrates a crimping machine embodying the principles of the invention.
  • the machine 10 includes a bed plate 11, a ram 12, a die ring 13, and a collet 14.
  • the ram 12 is reciprocally movable towards the bed plate 11 to drive the collet 14 into the die ring 13 to thereby cause the collet 14 to contract and crimp a fitting sleeve.
  • the bed plate 11 is, preferably, a rectangular rigid plate and forms the base of the crimping machine 10.
  • a slot 16 is machined or otherwise formed in the bed plate 11 from an area under the ram 12 laterally to a distal end 17 of the plate. Threaded into or otherwise fastened to the bed plate 11 is a set of four spaced rods 18 (of which only two appear in section) supporting the ram 12 on the bed plate and reacting against the forces developed by the ram.
  • the ram 12 comprises a hydraulic actuator including a hollow cylinder 21 and a reciprocating piston 22 therein.
  • the cylinder 21 is mounted between upper and lower end plates 23 and 24 respectively.
  • Each rod 18 includes a reduced diameter portion 26 and a shoulder 27 against which the lower end plate 24 is abutted.
  • Nuts 28 threaded on the upper end of the rod portions 26 are tightened to rigidly clamp thecylinder 21 between the end plates 23 and 24.
  • the cylinder 21 is peripherally sealed in a counterbore 29 of the upper end plate 23 by an O-ring or like gasket 31.
  • the piston 22 includes a circular head portion 32 and an axially extending cylindrical portion 33 of reduced diameter.
  • the circular head portion 32 has a pair of axiallyspaced peripheral grooves 34 for reception therein of a pair of resilient O-ring seals 36.
  • the O-ring seals 36 seal against the inner periphery of the cylinder 21 so that a variable volume chamber is defined by the end plate counterbore 29, an end face 38 of the piston head 32 and the portion of the inner periphery of the cylinder 21 between the end plate 23 and piston head end face 38.
  • the axes of the piston 22 and cylinder 21 define the axis of the ram 12 which is perpendicular to the bed plate 11.
  • a port 41 in the upper end plate 23 communicates with the counterbore 29 and is connected by a line 42 to a two position spool valve 43.
  • the valve 43 is connected to a pressure supply line 44 from a pump 45 and to a return line 46 to a reservoir 47.
  • a compression spring 48 in the cylinder 21 biases the piston 22 to the retracted position illustrated in FIG. 1.
  • the cylindrical portion 33 of the piston 22 extends through and is guided for reciprocation by a bore 49 in the lower end plate 24.
  • a cylindrical hollow driver 51 is secured to the piston portion 33 by a bolt 52.
  • the driver 51 is provided with an end face 53 generally perpendicular, to the axis of the ram 12.
  • a radial slot 54 through the wall of the driver 51 extends axially from its end face 53. This slot 54 in the driver is angularly aligned with the slot 16 in the bed plate 11.
  • the die block or ring 13 and collet 14 may be of the type disclosed in the aforementioned patent application of B. H. Pauly et al. or, as illustrated, may be of the types illustrated in the U. S. Patent application Ser. No. I874l0 filed Oct. 7, I971 of Irving Frank and assigned to the assignee of this application.
  • the collet 14 comprises a circular array of rigid, separate jaws or segments 57 held in angular alignment relative to one another by elastomeric material 58.
  • Radially outer surfaces 61 of each jaw 57 preferably have the same angle of taper as a bore 56 in the die ring 13.
  • Radial spaces (not shown) between the individual collet jaws 57 permit the collet jaws to radially contract relative to one another when they are cammed radially inwardly by the surface of the tapered bore 56 upon axial movement into the bore.
  • the bed plate 11 extends laterally from beneath the ram 12 for a sufficient distance 'so that the die ring 13 may be supported thereon at a loading position where it is not significantly obstructed in an axial direction by the ram 12. It may be appreciated that the collet 14 may be vertically positioned into and removed from the die ring 13 and a fitting 66 may be vertically positioned in and removed from the collet 14 without obstruction by the ram at this loading point.
  • the collet jaws 57 are provided with radially inner surfaces 62 which normally circumscribe a generally circular bore of a diameter slightly smaller than the diameter of a sleeve 67 of the fitting 66 before it is crimped.
  • a hose 68 may be positioned in the fitting sleeve 67 at the loading position illustrated in FIG. 1 so that it extends through the bed plate slot 16. Ordinarily there will be sufficient interference between the end of the hose 68 and the fitting 66 inside of the sleeve 67 to provisionally retain the hose therein until the sleeve is permanently crimped thereon.
  • a pressure plate 71 is positioned on an upper face 72 of the collet 14.
  • the pressure plate 71 is preferably circular includes a central aperture or bore 73 for passage therethrough of a portion of the fitting 66 extending out of the collet 14.
  • the pressure plate 71 is provided with a flat upper side or face 74 and a lower side or face 76 which includesa counterbore 77 therein.
  • the counterbore 77 preferably, is cylindrical and has a diameter or width greater than the diameter of the upper collet face 72 so that the collet 14 is received in the counterbore and abuts a radial surface 78 of the counterbore. This radial counterbore surface 78 is parallel to the portion, designated 79, of the lower face 76 surrounding the counterbore 77 and parallel to the upper face 74.
  • the die ring 13 may be manually moved from "the loading position laterally on the bed plate 11 until it is centered in a crimping position under the ram 12 with its axis coincident with that of the ram.
  • the machine 10 may then be energized to crimp the sleeve 67 on the hose 68 by shifting the spool valve 43 to the position illustrated in FIG. 2 where pressurized fluid from the pump 45 is directed through the line 42 into the cylinder 21 to operate against the end face 38 of the piston 22 and thereby force the driver 51 downwardly towards the pressure plate 71.
  • the pressure plate 71 distributes the force developed by the ram 12 evenly to the collet jaws 57 including those adjacent the driver slot 54.
  • the ram 12 is retracted from its extended position by shifting the spool valve 43 back to the position illustrated in FIG. 1 where fluid in the cylinder 21 is vented back through the line 42 into the reservoir 47 through the line 46. This permits the compression spring 48 to force the piston 22 upwardlyaway from the bed plate 11.
  • the die block 13 may thereafter be manually moved from the crimping position back to the loading position where' the hose 68 and fitting 66, now permanently assembled, may be removed from the collet 14.
  • the stroke of the ram may be minimized.
  • a portion of the fitting 66 extending above the pressure plate 71 may pass through the driver slot 54 so that the driver 51 need only be retracted far enough to permit the die ring 13, collet 14, and pressure plate 71, regardless of which pressure plate face 74 or 76 is up, to be moved laterially thereunder.
  • the short ram stroke results in savings in ram actuator cost by permitting the use of a single acting spring return type piston and cylinder, lowers reciprocation cycle time, reduces pump capacity requirements, and improves the portability of the machine by reducing its weight and size.
  • the pressure plate 71 may be reversed face for face. inverting the plate from the position illustrated in FIGS. 1 and 2 determines a different final crimping diameter of the sleeve 67 to thereby adjust for differences in hose construction.
  • a given hose size, measured by inside diameter may have three distinct outside diameters corresponding to low, medium and high pressure ratings.
  • a portion of the illustrated upper plate surface 74 is adapted to engage the upper surface 72 of the collet.
  • a machine for crimping a sleeve of a fitting on a hose comprising a bed plate, a ram reciprocable along I be positioned into and removed from the die ring bore when the ring is in said unobstructed position, said collet assembly including a central bore therethrough adapted to receive a fitting sleeve for crimping, a slot through said bed plate extending from said ram axis laterally to said unobstructed position to thereby permit a hose positioned in said sleeve to be moved with the collet assembly from said unobstructed position to said ram axis, reciprocation of said ram towards said bed plate causing said collet to move axially into said ring and thereby be radially contracted to crimp said sleeve onto said hose.
  • said ram includes a hollow driver, the walls of said driver terminating at a driving surface perpendicular to the ram axis, an axial slot through the driver wall extending from said driving surface and in angular alignment with said bed slot whereby a portion of a fitting extending outward of said collet may be moved radially into said driver and thereby minimize stroke of said ram.
  • a machine as set forth in claim 2 including a pressure plate having an aperture therethrough to permit said outwardly extending fitting portion to be posi tioned therein while said plate is positioned on a side of the collet assembly facing said ram, said plate being circumferentially continuous about said aperture, said pressure plate being engaged by said driver surface and distributing a force developed by said ram uniformly to said collet assembly including a portion of said collet adjacent said axial slot in said driver when said collet assembly is moved by said ram into said bore.
  • said pressure plate includes a pair of opposed faces, a first of said faces having a counterbore therein, said counterbore including an inner radial surface associated with said aperture at a predetermined axial distance from said first face, the width of said counterbore being greater than said collet side to permit said plate to be positioned on said collet with said collet side abutting said radial counterbore surface whereby said plate determines a first axial position and corresponding contraction of the collet when said first face engages said die ring, a second face of said plate including a surface portion engageable with said collet when the plate is reversed face for face and a surface portion engageable with the die ring, any axial distance between said surface portions being different than the axial-distance between said first face and said radial counterbore surface such that when the die ring engaging surface portion of said second face abuts said die ring said collet is in an axial position and corresponding contraction different than that when
  • a ram reciprocable towards and away from the bed along an axis, force means for moving said ram along said axis, a die ring disposed between the bed and ram and including a tapered bore therein, a radially contractible collet in the tapered bore and adapted to be driven axially into said bore and thereby contracted by said ram, and reversible plate means to selectively determine the contraction of said collet, one side of said plate including means to limit movement of said collet to a first axial position in the die ring, the other side of said plate including means to limit axial movement of said collet to a second axial position.
  • a machine for crimping a fitting on a hose comprising a bed, a ram reciprocal towards and away from the bed along an axis, force means for moving said ram along said axis, a die ring disposed between the bed and 1 ram and including a tapered bore therein, a radially contractible collet in the tapered bore and adapted to be driven axially into said bore and thereby contracted by said ram, a pressure plate positionable between said collet and said ram to transmit the force of the ram to the collet, one side of said pressure plate having first and second axially spaced surfaces, the first plate surface being adapted to engage said collet and the second plate surface being adapted to engage said die ring, said pressure plate limiting axial motion of the collet to a first position when said second surface engages said die ring, another side of said pressure plate having a collet engaging surface portion and a die ring engaging surface portion, any axial distance between said surface portions being different

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Joints That Cut Off Fluids, And Hose Joints (AREA)
  • Automatic Assembly (AREA)
US00191366A 1971-10-21 1971-10-21 Gaging device for crimping machine Expired - Lifetime US3742754A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19136671A 1971-10-21 1971-10-21

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US3742754A true US3742754A (en) 1973-07-03

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Application Number Title Priority Date Filing Date
US00191366A Expired - Lifetime US3742754A (en) 1971-10-21 1971-10-21 Gaging device for crimping machine

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US (1) US3742754A (enrdf_load_html_response)
JP (1) JPS5520774B2 (enrdf_load_html_response)
CA (1) CA980551A (enrdf_load_html_response)
DE (1) DE2251564C2 (enrdf_load_html_response)
FR (1) FR2157588A5 (enrdf_load_html_response)
GB (1) GB1380634A (enrdf_load_html_response)
IT (1) IT975326B (enrdf_load_html_response)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851514A (en) * 1973-07-18 1974-12-03 Weatherhead Co Swing-open crimper
US4118970A (en) * 1977-07-07 1978-10-10 The Weatherhead Company Crimping diameter adjusting valve
US4309892A (en) * 1980-04-30 1982-01-12 Parker-Hannifin Corporation Crimping machine
US4515006A (en) * 1983-01-27 1985-05-07 The Goodyear Tire & Rubber Company Hose coupling crimper and method of crimping
WO1985001897A1 (en) * 1983-11-01 1985-05-09 Parker-Hannifin Corporation Crimping machine with split die ring
WO1991015331A1 (en) * 1990-04-06 1991-10-17 Lokring Corporation Hydraulic assembly tool with improved load bearing arrangement for tube fittings
US5644945A (en) * 1996-03-29 1997-07-08 Caterpillar Inc. Crimping die for use in a crimping machine
US5651282A (en) * 1995-06-05 1997-07-29 Ford Motor Company Method of controlling a crimp press for crimping a hose assembly
US5829289A (en) * 1995-06-05 1998-11-03 Ford Motor Company Method of controlling a crimp press for crimping an assembly
US20050056076A1 (en) * 2003-09-15 2005-03-17 Curry Jeffory T. Adjustable crimping tool
US20070072484A1 (en) * 2005-09-28 2007-03-29 Dimilia Robert A Crimp machine with quick release pushers
US20110163536A1 (en) * 2010-01-04 2011-07-07 Lokring Technology, Llc Mechanically Attached Fitting for Use in a Sour Environment
US9365008B1 (en) * 2012-09-28 2016-06-14 Michael Kenneth Walker Actuating device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034593A (en) * 1976-04-09 1977-07-12 The Weatherhead Company Crimping machine with automatic swing open pushers
US4357822A (en) * 1980-09-29 1982-11-09 Dana Corporation Crimping collet
JPS57160409U (enrdf_load_html_response) * 1981-04-01 1982-10-08
DE3610022C2 (de) * 1986-03-25 1996-03-14 Stade Umformtechnik Gmbh Verfahren und Vorrichtung zur Herstellung von Sicken in einem Blech
US4887451A (en) * 1988-08-10 1989-12-19 Dana Corporation Self-retracting modular collet assembly
CN112517703B (zh) * 2020-11-13 2023-05-09 浙江久泰集成房屋科技有限公司 一种薄壁金属板压槽模具

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2231278A (en) * 1937-09-24 1941-02-11 Flex O Tube Company Crimping machine
US3047043A (en) * 1959-11-18 1962-07-31 Hose Accessories Co Apparatus for applying hose couplings to hoses
US3072174A (en) * 1960-06-20 1963-01-08 Resistofiex Corp Expanding tool
US3096876A (en) * 1960-12-23 1963-07-09 Atlas Copco Ab Portable swaging device
US3373474A (en) * 1965-11-08 1968-03-19 Dresser Corp Swaging machine
US3568494A (en) * 1968-08-29 1971-03-09 Aeroquip Corp Crimp machine
US3606789A (en) * 1969-04-09 1971-09-21 Sigma Lutin Apparatus for manufacturing a pump spindle

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3052280A (en) * 1957-07-16 1962-09-04 Collin Flaring tool

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2231278A (en) * 1937-09-24 1941-02-11 Flex O Tube Company Crimping machine
US3047043A (en) * 1959-11-18 1962-07-31 Hose Accessories Co Apparatus for applying hose couplings to hoses
US3072174A (en) * 1960-06-20 1963-01-08 Resistofiex Corp Expanding tool
US3096876A (en) * 1960-12-23 1963-07-09 Atlas Copco Ab Portable swaging device
US3373474A (en) * 1965-11-08 1968-03-19 Dresser Corp Swaging machine
US3568494A (en) * 1968-08-29 1971-03-09 Aeroquip Corp Crimp machine
US3606789A (en) * 1969-04-09 1971-09-21 Sigma Lutin Apparatus for manufacturing a pump spindle

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851514A (en) * 1973-07-18 1974-12-03 Weatherhead Co Swing-open crimper
US4118970A (en) * 1977-07-07 1978-10-10 The Weatherhead Company Crimping diameter adjusting valve
FR2396602A1 (fr) * 1977-07-07 1979-02-02 Weatherhead Co Perfectionnements aux machines a sertir
US4309892A (en) * 1980-04-30 1982-01-12 Parker-Hannifin Corporation Crimping machine
EP0039200A3 (en) * 1980-04-30 1982-05-12 Parker Hannifin Corporation Crimping machine
US4515006A (en) * 1983-01-27 1985-05-07 The Goodyear Tire & Rubber Company Hose coupling crimper and method of crimping
WO1985001897A1 (en) * 1983-11-01 1985-05-09 Parker-Hannifin Corporation Crimping machine with split die ring
US5305510A (en) * 1990-04-06 1994-04-26 Lokring Corporation Hydraulic assembly tool with improved load bearing arrangement for tube fittings
WO1991015331A1 (en) * 1990-04-06 1991-10-17 Lokring Corporation Hydraulic assembly tool with improved load bearing arrangement for tube fittings
US5651282A (en) * 1995-06-05 1997-07-29 Ford Motor Company Method of controlling a crimp press for crimping a hose assembly
US5829289A (en) * 1995-06-05 1998-11-03 Ford Motor Company Method of controlling a crimp press for crimping an assembly
US5644945A (en) * 1996-03-29 1997-07-08 Caterpillar Inc. Crimping die for use in a crimping machine
US20050056076A1 (en) * 2003-09-15 2005-03-17 Curry Jeffory T. Adjustable crimping tool
WO2005035164A1 (en) * 2003-09-15 2005-04-21 Caterpillar, Inc. An adjustable crimping tool
US20070072484A1 (en) * 2005-09-28 2007-03-29 Dimilia Robert A Crimp machine with quick release pushers
US7383714B2 (en) * 2005-09-28 2008-06-10 Eaton Corporation Crimp machine with quick release pushers
US20110163536A1 (en) * 2010-01-04 2011-07-07 Lokring Technology, Llc Mechanically Attached Fitting for Use in a Sour Environment
US8870237B2 (en) 2010-01-04 2014-10-28 Lokring Technology, Llc Mechanically attached fitting for use in a sour environment
US9365008B1 (en) * 2012-09-28 2016-06-14 Michael Kenneth Walker Actuating device

Also Published As

Publication number Publication date
DE2251564A1 (de) 1973-04-26
JPS4850973A (enrdf_load_html_response) 1973-07-18
GB1380634A (en) 1975-01-15
IT975326B (it) 1974-07-20
CA980551A (en) 1975-12-30
FR2157588A5 (enrdf_load_html_response) 1973-06-01
DE2251564C2 (de) 1985-07-25
JPS5520774B2 (enrdf_load_html_response) 1980-06-05

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