US3889342A - Apparatus for assembling piston ring end guides - Google Patents
Apparatus for assembling piston ring end guides Download PDFInfo
- Publication number
- US3889342A US3889342A US396500A US39650073A US3889342A US 3889342 A US3889342 A US 3889342A US 396500 A US396500 A US 396500A US 39650073 A US39650073 A US 39650073A US 3889342 A US3889342 A US 3889342A
- Authority
- US
- United States
- Prior art keywords
- ring
- plunger
- guides
- gap
- end guide
- 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
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Classifications
-
- 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
- B25B27/12—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 mounting or demounting piston rings
-
- 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
- Y10T29/53039—Means to assemble or disassemble with control means energized in response to activator stimulated by condition sensor
- Y10T29/53061—Responsive to work or work-related machine element
-
- 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
- Y10T29/53478—Means to assemble or disassemble with magazine supply
Definitions
- ABSTRACT Apparatus for assembling with split expansion rings end guides which carry integral self retaining frictional elements engageable with the ring at opposite sides of the ring gap.
- an end guide unit is fed into position across the ring gap and is then pushed into position within the ring across the gap, the frictional retaining elements being forced into position between the spaced wall flange segments defining the channel within the ring in which the end guide is received.
- This invention relates to apparatus for assembling piston ring end guides or latches with the piston rings, and is more particularly concerned with apparatus which is especially efficient in assembling self-retaining end guides with the piston rings.
- split piston ring employed as an expander or spacer expander ring, normally used as part of an oil control ring assembly
- two flat rail rings are maintained in axially separated position and expanded radially outwardly by the spacer-expander ring.
- end guides or latches are employed to assure that the ends of the split ring will properly abut.
- end guides or latches Inasmuch as the sole function of the end guides or latches is to maintain the end alignment of the rings, the end guides or latches must be low cost and every effort must be made to maintain the cost of assembling the end guides or latches with the rings to the barest minimum.
- a new and improved end guide has been devised which comprises a single piece molded plastic unit having an elongated lance portion projecting from a self-retaining head to extend across the gap in a ring within a radially outwardly opening channel of which the unit is received.
- the unit In addition to a retaining head at one end, the unit also carries integrally therewith a separable retaining element spaced from the head and engageable with the ring at the opposite side of the gap therein from the head end retaining element.
- a further economy has been to mold a plurality of the end guides in a generally seriate ladderform arrangement for seriatim detachment from the ladder and assembly with respective piston rings.
- An important object of the present invention is to provide a new and improved appartus for installing selfretaining end guides or latch units with piston rings.
- Another object of the invention is to provide a new and improved apparatus which is especially suitable for feeding end guides from a supply into position for assembly with piston rings.
- a further object of the invention is to provide new and improved apparatus which efficiently directs end guides from a supply into position for assembly with piston rings and sequentially assembles the end guides with the piston rings.
- Still another object of the invention is to provide a new and improved apparatus for assembling end guides with piston rings and which will automatically operate in a complete sequential cycle including feeding an end guide into position for assembly with a piston ring and then effecting actual assembly of the end guides with the piston rings, rapidly and efficiently.
- FIG. 1 is a fragmentary elevational view, partially in section, of a piston and cylinder assembly demonstrating utility of a piston ring of the type with which the present invention is concerned.
- FIG. 2 is a fragmentary enlarged cross-sectional view of an oil control piston ring assembly received in a groove in the piston of FIG. 1.
- FIG. 3 is a plan view of an expander-spacer ring equipped with an end guide or latch of the type with which the present invention is concerned.
- FIG. 4 is a fragmentary elevational view taken substantially along the line IV-IV of FIG. 3.
- FIG. 5 is a fragmentary longitudinal sectional elevational view taken substantially along the line VV of FIG. 4.
- FIG. 6 is an enlarged sectional detail view taken substantially along the line VI-VI of FIG. 5.
- FIG. 7 is an enlarged fragmentary sectional detail view taken substantially along the line VIIVII of FIG. 5.
- FIG. 8 is a fragmentary elevational view of an end guide unit supply ladder provided as a unitary plastic molding.
- FIG. 9 is a front elevational view of apparatus for assembling the end guides with piston rings.
- FIG. 10 is a top plan view of the apparatus of FIG. 9, taken substantially in the plane of line X-X in FIG. 9.
- FIG. 11 is an enlarged fragmentary sectional view taken substantially along the line XI-Xl of FIG. 9.
- FIG. 12 is a fragmentary enlarged sectional detail view taken substantially along the line XII-XII of FIG. 9.
- FIG. 13 is an enlarged fragmentary sectional elevational view taken substantially along the line XIII-XIII of FIG. 10.
- FIG. 14 is a schematic illustration of an operating electropneumatic circuit for cyclical operation of the apparatus.
- FIG. 1 a representative piston 15 and cylinder 17 of an internal combustion engine wherein the piston has a plurality of ring assemblies mounted in its perimeter adjacent to its head end, including compression rings 18 and 19 and an oil ring assembly 20.
- the oil ring assembly 20 includes an expander-spacer ring 21 and two rail rings 22 and 27, the assembly being received in a complementary ring groove 28 in the piston 10.
- the expanderspacer ring 21 is of generally U-shape cross section providing a radially outwardly opening channel 29 defined by a top row 30 and a bottom row 31 of circumferentially spaced flange segments which project radially in spaced parallel relation and are connected together at their radially inner edges by vertically extending web sections 32 integral therewith through axially extending respective reverse bend formations 33 against which the radially inner edges of the rail rings 22 and 27 seat and are thrust radially outwardly to engage the wall of the cylinder 17.
- the ring 21 is compressed from a normal expanded condition wherein the flange segments 22 and 27 and the connecting sections 32 act as springs to generate a circumferential expanding force against the rail rings 22 and 27.
- gap latch or end guide 37 comprising a guide shaft 38 of a length to extend to a substantial distance each side of the gap 35 when received within the channel 29 and of a width only slightly smaller than the space between the wall segments 30 and 31.
- Means for retaining the end guide 37 in place in the assembly comprise retaining elements which are respectively frictionally anchored to the ring at opposite sides of the gap 35 and prevent escape of the guide 37 after assembly with the ring.
- one of the retaining elements comprises a head block 39, integral at one end of the shaft 38, having lateral friction bosses 40 on its sides to facilitate frictional retaining gripping engagement with the confronting inner faces of the segments 30 and 31 at one side of the gap 35 with the shaft 38 extending from the head 39 across the gap and to a substantial extent beyond the opposite end of the ring between the segments 30 and 31.
- a second frictionally anchored retaining element 41 is provided which engages in firm frictional relation with and between the segments 30 and 31 adjacent the end 34 of the ring which is opposite to the end 34 adjacent to which the head retaining element 39 is positioned.
- the element 41 is provided with respective side projecting friction bosses 42 (FIGS. 4,5 and 7) which retain this element in overlying relation to the shaft 38.
- a chamfered end edge 43 is directed toward a barb-like shouldered tip 44 on the distal end of the shaft 38 which faces generally toward the latch element 41.
- the retaining element 41 is provided as an originally integral part of the end guide 37 so as to avoid the need for handling separate parts, with the frictional resistance upon engagement of the bosses 42 with the segments 30 and 31 during assembly causing the element 41 to detach from the shaft 38 so that after assembly the shaft can move relative to the fixed latch element 41.
- the element 41 is, as initially made, attached to the shaft 38 by a frangible neck 45 (FIG. 8).
- a plurality of the end connectors or guides 37 are preferably molded in a convenient spaced seriate, ladderlike arrangement 45 providing a suitable plurality of the guides connected as by means of frangible connections 47 to a common bar 48 at the head retaining elements 39, and by means of frangible connections 49 to a common bar 50 at the terminals of the tips 44.
- the individual guides 37 can be readily broken from the spaced parallel bars 48 and 50 by rupturing the respective frangible connections 47 and 49, to supply the end guides seriatim to piston rings as required.
- the apparatus is provided with means for receiv ing the end guides 37 in the ladder 46 supply arrangement, stripping the end guide units 37 successively from the supply ladder 46, feeding each successively stripped end guide 37 into position for assembly with a respective one of the piston rings 21, and completing the assembly by press fitting the retaining element head 47 within the ring at one side of the gap 35, and separating and press fitting the retaining element 41 of the end guide into the ring at the opposite side of the gap over the shank 38 of the assembled end guide.
- the apparatus includes a magazine structure (FIGS.
- vertical guide track means are provided for receiving the ladder bars 48 and 50, comprising a vertical track groove 52 for the bar 48 and a vertical track groove 53 for the bar 50.
- the track grooves 52 and 53 guide the ladder 46 downwardly so that the lowermost of the end guides 37 rests upon a complementary feed surface 54 extending in a front to rear direction and having a transverse curvature formed on a radius substantially complementary to the radius of curvature of the outer diameter of the piston ring 21 and to which curvature the end connector shafts 38 are also desirably formed to facilitate assembly of the end connectors with the rings.
- the feed surface 54 is provided on a member 55 providing at each side of the feed surface at least in line with the track grooves 52 and 53 escape clearances for discard of the bars 48 and as the end guides 37 are progressively stripped therefrom.
- body member in the form of a vertical plate 57 which also supports the magazine 51 and is mounted on a base provided by a horizontal base plate 58 carried by a machine frame 59.
- Drop-out holes 60 in the base plate 58 are provided in line with the track grooves 52 and 53 for discard of the separated ladder posts 48 and 50 to a suitable scrap receptacle thereunder.
- Each of the end guides 37 is successively stripped from the supply ladder and moved into position for assembly with one of the rings 21 by means of a reciprocable feed plunger 61 which is formed in complementary shape to engage slidably with the feed surface 54 and is of a thickness and a width to engage with substantially the entire length at the rear side of the end guide shaft 38 which lies upon the feed surface, as best seen in FIGS. 11 and 13.
- Feeding stroke and return reciprocations of the plunger 61 are effected by means of a motor 62 desirably in the form of a fluid operated, such as pneumatic, cylinder having a piston 63 suitably attached as through the medium of a yoke bar 64 to the rear end of the plunger 61.
- Means such as mounting box 65 support the motor 62 over the base plate 58.
- means comprising a fixed guide rod 67, projecting forwardly from the top of the block 65 in spaced parallel relation to the piston rod 63, extends through a complementary guide aperture 68 in the yoke bar 64.
- the plunger 61 moves from a retracted position as shown in full line in FIG. 11, forwardly into engagement with the end guide 37 resting on the feed surface 54, stripping such end guide from the ladder bars 48 and 50 by breaking the respective connections 47 and 49.
- the plunger 61 moves it through a clearance aperture 69 in the mounting plate 57 and finally into assembly position aligned with the channel 29 of one of the rings 21 supported on a stepped mandrel 70 desirably comprising a forward extension from the member 55 and offset concentrically relative to the feed surface 54 equal to the radial dimension of the ring so that the free edges of the flange segments 30 and 31 lie within the curved plane of the feed surface.
- Feed thrust of the plunger 61 is controlled to drive the end guide forwardly beyond the front end of the feed surface 54 and into position directly over the channel 29 of the ring 21.
- the end guide 38 Just as the end guide 38 reaches the assembly position over the ring 21, it is restrained against overshooting and is pressed down into the channel 29 by means comprising a biasing leaf spring finger 71.
- the finger 71 desirably also serves as an aid to positioning the ring 21 and holding the ring in the proper assembly position on the mandrel 70.
- the spring finger 71 has an attachment terminal flange 72 received in a suitable complementary recess 73 in the back face of the mounting panel 57 and above the clearance opening 69, means comprising the screws 74 securing the flange in place and to position the spring finger in a downwardly and forwardly oblique biasing position normally pressing downwardly and with a slight rearward component of biasing pressure against the ring segment flanges 31 whereby the ring is held down against the mandrel 70 and against a rear locating shoulder 75 providing a drop-off from the feed surface 54.
- the biasing spring finger 71 is centered, as best seen in FIGS. 9, and 13, in the opening 69, and a longitudinal central clearance notch 77 is provided in the plunger 61 to clear the spring finger.
- the front terminal end portion of the finger is turned up to provide a cam lip 78.
- the ring can be pressed rearwardly into the assembly position under the finger by camming the ring against the lip 78.
- the turned up curved lip 78 facilitates smooth release of the ring 21 after assembly of the selected end guide 37 has been completed.
- the mandrel 70 is in the form of a segment of a cylinder which is wide enough to support the ring 21 equally at each side of the ring gap 35 within which is received a fixed locating key 79 (FIGS.
- the key 79 is carried fixedly by the mandrel 70.
- the gap 35 must be properly located to receive the key 79 therein between the ends 34 of the ring (FIG. 13). This properly locates the gap for reception of the retaining elements 39 and 41 of the end guide within the respective end portions of the ring.
- Means for driving the retaining elements 39 and 41 into their generally press fit frictional retaining engagement within the end portions of the ring 21 comprise an insertion plunger 80 (FIGS. 9, 12 and 13) which is guided reciprocably by a guide plate or bracket 81 mounted on the forward face of the supporting panel 57 in a position to engage and drive the retaining elements 79 and 41 into the channel of the ring 21.
- Reciprocal cyclical driving and return strokes of the plunger 80 are effected by suitable means comprising a motor 82 such as a fluid operated, i.e. pneumatic, cylinder mounted on a suitable supporting bracket 83 (FIGS. 9 and 10) carried by the mounting plate 57.
- a piston rod 84 of the motor 82 is suitably connected to the upper end of the plunger 80.
- the lower front end portion of the plunger 80 carries fixedly therewith a downwardly extending alignment finger 85 having a longitudinal downwardly opening notch 87 to clear the key 79 and providing a pair of spaced finger projections 88 for alignment engagement with each of the end portions of the ring 21 so that if there is any misalignment due to warpage or any other reason of the end portions or if the ring has not been quite fully pushed toward the shoulder 75 during mounting of the ring, the alignment fingers 88 will, in advance of engagement with the end guide by the plunger 80 properly align the end portions of the ring.
- the finger projections 88 extend beyond the driving end of the plunger 80 and are provided with lead-end oblique cam surfaces 89 facing toward the ring.
- the mandrel 70 is provided with respective clearance holes 90 at the respective opposite sides of the key 79.
- the element 41 enters into press fit with the respective ring wall segments 30 and 31 and being fully press fitted in place detaches from the shaft 38 while the shoulder 91 moves the element 39 into its fully driven position wherein the shaft 38 underlies the element 41, substantially as depicted in FIG. 5.
- the plunger 80 is backed off and the ring 21 loaded with the end guide 37 assembled therewith is removed from the mandrel 70 and another ring placed in position to have one of the end guides 37 assembled therewith in a repeat cycle.
- Such assembly cycles can be continued as long as there are end guides 37 in the ladder 46, the next succeeding of the end guides 37 falling into position automatically as each preceding end guide is stripped from the ladder.
- the magazine tracks 52 and 53 are of sufficient length so that when the operator observes that the upper end of the ladder has descended significantly below the top of the mounting plate 57, another ladder 46 can be inserted to continue descending with the preceding ladder as one after the other of the end guides 37 is stripped therefrom in the operation of the machine.
- Means are provided for coordinating operations of the plungers and effecting the feeding and assembling functions in proper automatic sequence.
- the operator mounts one of the rings 21 in position and then manually operates a device for initiating a cycle of operation, such as pressing a starting button 93 (FIG. 14) of an operating circuit functioning through means for maintaining the cycle of operation to completion comprising a relay 94 which initially actuates an electrical device 95 to operate a valve 97 to direct air from a source 98 to the feed slide motor 62, thereby energizing it to feed one of the end guides 37 into position over the ring to receive the same.
- a trip head 99 As the feed plunger 61 reaches the end of its feeding stroke, a trip head 99 (FIG.
- Apparatus for assembling end guides with split piston rings of channel shape comprising:
- Apparatus according to claim 1 including means cooperative with said inserting means for assuring alignment of the ends of the ring with one another and alignment of the end portions of the ring with said insertion means.
- said insertion means comprises a plunger having stepped thrusting shoulders for successively driving retaining elements of the end guide into engagement with the respective opposite end portions of the ring.
- stepped shoulders comprise a first shoulder for driving a terminal head element into press fit within the ring channel up one side of the gap and a second shoulder for driving a latch retaining element of the end guide into press fit engagement with the opposite end portion of the ring.
- said feeding means include a feed surface, and a feed plunger for driving the end guide from a supply into position with respect to the ring which will receive the end guide.
- Apparatus according to claim 6, including a magazine for receiving a ladder of seriate end guides, and said feeding means comprising a feed surface on which the end guides of the ladder are successively received. and a plunger for stripping the end guides successively from the ladder and thrusting them along said feed surface into position for assembly with the ring by said inserting means.
- Apparatus according to claim 1 including means for cyclically coordinating operation of said feeding means and said inserting means.
- said feeding means includes a feeding plunger and a driving motor
- said inserting means comprises an inserting plunger and a drive motor
- means for cyclically operating said motors comprising a manually operable device for initiating the cycle and means for maintaining the cycle of operation to completion including sequential operation of said feeding means and said inserting means.
- An apparatus for assembling elongated end guides with piston rings comprising:
- a plunger for driving the end guide which is an engagement with said surface into position for insertion into the channel of the ring.
- Apparatus according to claim 10, wherein said means for supporting a ring comprises a stepped mandrel supporting the ring with its outer perimeter aligned with said surface, and means for holding the ring in position relative to said surface to receive the end guide.
- Apparatus according to claim 11, wherein said means for holding the ring include a shoulder between said mandrel and said surface and a biasing element having components of biasing thrust toward said mandrel and toward said shoulder.
- Apparatus according to claim 12, wherein said biasing means comprises a spring finger functioning means for inserting the end guides into the ring channel includes a plunger. respective motors for driving said plungers, and means for coordinating operation of said motors.
- said means for coordinating operation of said motors including a circuit having respective limit switches activated by means connected with said plungers.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
Description
Claims (16)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US396500A US3889342A (en) | 1973-09-12 | 1973-09-12 | Apparatus for assembling piston ring end guides |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US396500A US3889342A (en) | 1973-09-12 | 1973-09-12 | Apparatus for assembling piston ring end guides |
Publications (1)
Publication Number | Publication Date |
---|---|
US3889342A true US3889342A (en) | 1975-06-17 |
Family
ID=23567440
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US396500A Expired - Lifetime US3889342A (en) | 1973-09-12 | 1973-09-12 | Apparatus for assembling piston ring end guides |
Country Status (1)
Country | Link |
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US (1) | US3889342A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4967459A (en) * | 1988-11-18 | 1990-11-06 | Renault Automation | Unit for distributing and installing rings on pistons |
WO2012069470A1 (en) | 2010-11-24 | 2012-05-31 | Colibri' System S.P.A. | Electrically operated machine for covering book covers and sealing envelopes and articles of various kind |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3681837A (en) * | 1971-06-14 | 1972-08-08 | Giddings & Lewis | Automatic assembly system employing first and second hammer mechanisms for insertion of workpieces |
-
1973
- 1973-09-12 US US396500A patent/US3889342A/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3681837A (en) * | 1971-06-14 | 1972-08-08 | Giddings & Lewis | Automatic assembly system employing first and second hammer mechanisms for insertion of workpieces |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4967459A (en) * | 1988-11-18 | 1990-11-06 | Renault Automation | Unit for distributing and installing rings on pistons |
WO2012069470A1 (en) | 2010-11-24 | 2012-05-31 | Colibri' System S.P.A. | Electrically operated machine for covering book covers and sealing envelopes and articles of various kind |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TRW AUTOMOTIVE PRODUCTS INC., A CORP OF OH Free format text: CHANGE OF NAME;ASSIGNOR:RAMSEY CORPORATION;REEL/FRAME:004405/0814 Effective date: 19840604 |
|
AS | Assignment |
Owner name: SPX CORPORATION, A CORP. OF DE. Free format text: MERGER;ASSIGNORS:SPAR CORPORATION, A CORP. OF DE (MERGED INTO);SEALED POWER CORPORATION, A CORP. OFDE. (CHANGED TO);REEL/FRAME:005164/0083 Effective date: 19880425 |
|
AS | Assignment |
Owner name: KODIAK PARTNERS CORP., A CORP. OF DE, MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SPX CORPORATION, A DE CORP.;REEL/FRAME:005125/0002 Effective date: 19890525 |
|
AS | Assignment |
Owner name: CHEMICAL BANK, NEW YORK Free format text: SECURITY INTEREST;ASSIGNOR:SEALED POWER, TECHNOLOGIES, L.P., A DE LIMITED PARTNERSHIP;REEL/FRAME:005094/0360 Effective date: 19890530 |
|
AS | Assignment |
Owner name: CHEMICAL BANK, A NEW YORK BANKING CORP., AS AGENT Free format text: SECURITY INTEREST;ASSIGNOR:SEALED POWER TECHNOLOGIES, L.P.;REEL/FRAME:005106/0271 Effective date: 19890530 |
|
AS | Assignment |
Owner name: SEALED POWER TECHNOLOGIES, L.P., MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KODIAK PPARTNERS CORP.;REEL/FRAME:005208/0100 Effective date: 19890525 |
|
AS | Assignment |
Owner name: SEALED POWER TECHNOLOGIES, L.P. Free format text: CHANGE OF NAME;ASSIGNOR:SEALED POWER TECHNOLOGIES, L.P.;REEL/FRAME:005134/0125 Effective date: 19890607 |
|
AS | Assignment |
Owner name: SEALED POWER CORPORATION, MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TRW AUTOMOTIVE PRODUCTS INC.;REEL/FRAME:005184/0376 Effective date: 19870717 |