US1848083A - Method of forming valve tappets - Google Patents
Method of forming valve tappets Download PDFInfo
- Publication number
- US1848083A US1848083A US384067A US38406729A US1848083A US 1848083 A US1848083 A US 1848083A US 384067 A US384067 A US 384067A US 38406729 A US38406729 A US 38406729A US 1848083 A US1848083 A US 1848083A
- Authority
- US
- United States
- Prior art keywords
- tappet
- die
- billet
- base
- metal
- 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
- 238000000034 method Methods 0.000 title description 9
- 239000002184 metal Substances 0.000 description 19
- 229910052751 metal Inorganic materials 0.000 description 19
- 239000000463 material Substances 0.000 description 10
- 238000001125 extrusion Methods 0.000 description 5
- 229910001018 Cast iron Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/22—Making metal-coated products; Making products from two or more metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
-
- 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
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
- Y10T29/49298—Poppet or I.C. engine valve or valve seat making
- Y10T29/49307—Composite or hollow valve stem or head making
- Y10T29/49311—Composite or hollow valve stem or head making including extruding
-
- 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
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49908—Joining by deforming
- Y10T29/49925—Inward deformation of aperture or hollow body wall
- Y10T29/49934—Inward deformation of aperture or hollow body wall by axially applying force
-
- 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
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49908—Joining by deforming
- Y10T29/49936—Surface interlocking
Definitions
- This invention relates to valve tappets and more particularly to that type of tappet in which the base or cam-engaging face is formed of one kind of metal, while the stem .5 or shell portion is formed of a different kind of metal.
- the outside surface of the shell requires considerable machining when cast and if the inside surface is not machined there is a possibility of slightly different weights in/the various tappets, due to molding inaccuracies. If theshell be made in the usual manner from solid steel stock, then a large amount of machining is necessary to remove the material in the center.
- the shell portion is .Y formed of solid stock by the extrusion process.
- a heated billet of metal is placed in a die and a plunger is forced under considerable pressure into the billet, causing the metal in the latter to low axially into the space between the plunger and the die, thusforming a tubular shell.
- part of the metalin thebillet is forced into engagement with a groove formed in a base member of chilled cast iron, alloy steelor some other. suitable material, which has previously been-placed inthe die.
- the resulting tappet requires no machining other than a slight grinding operation on its eX- terior surface to provide a ⁇ proper bearing surface, and all vsuch tappets are necessarily .of exactly the same weight due to the method employed in their manufacture. Such tappets may be produced very rapidly and con- 70 seliently their cost is comparatively low.
- Fig. 1 is a fragmentary ,sectional view 75 through the center of the dies employed in the manufacture/of my improved tappet, showing the base and the heated billet in the die beforethe act of extrusion has taken place. l A
- Fig. 2 is a view similar to Fig. 1, but showing the lposition of the parts after the act of extrusion.
- Fig. 3 is afragmentary vertical section through a portion of an internal combustion '85 engine, showing my improved tappetv assembled therein.
- the reference numeral 10 indicates a stationary die having an aperture 12 therein of the same diameter as that of the tappet to be produced.
- a movable support 14 fits into the lower end of the aperture -12 and is adapted to be moved up or' down by any suitable means.
- a plunger 16.01 the same diameter as that of the inside of the' finished tappet 95 is removably mountedin a movable member 18 adapted to be reciprocated by any suitable means which willfurnish suicient pressure to accomplish the act of extrusion to be described later.
- the first step in the production of the tappet is to form a base or cam-engaging member 20 of chilled cast iron, alloy steel or other suitable material.
- An annular groove 22, preferably undercut, is formed in the base. This base is placed in the aperture 12 in such position that the cam engaging face abuts against the support 14, with the groove 22 on the upper side.
- a billet 24 of any suitable metal, such as ordinary steel, is heated to a temperature sufficiently high to permit the metal to flow when placed under pressure.
- This heated billet is just enough smaller in diameter than the diameter of the aperture 12 to permit it to be inserted therein, on top of the base 20.
- the plunger 16 is then forced under pressure into the billet, and, since the metal cannot flow radially, it must ow axially downward into the groove 22, and upwardly into the space between the plunger 16 and the die 10. Due to the fact that the metal in the billetl cannot flow radially, there is no possibility of cracks developing in the outer surface of the metal due to expansion.
- the thickness of the billet is so proportioned that when the plunger has reached the bottom of its stroke,'the metal will have flowed upwardly to such a point as will produce a shell 25 of the desired length.
- the plunger is then withdrawn, and the tappet is ejected from the die by causing the support 14 to be moved upwardly.
- the groove 22 may not be necessary that the groove 22 be undercut, since when certain combinations Of metals are employed, the upper corner of ⁇ the base tends to expand outwardly during the act of extrusion, and thereby serves to lock the base and shell together. In this case an ordinary straight groove in the base is all that need be provided.
- Fig. 3 the tappet is shown assembledin an engine 26.
- valve tappet which consists in placing a cam-engagingl member' having a groove formed therein in a die, inserting a heated metal billet adjacent said member, and then forcing a plunger into said billet to cause the metal in the latter to flow axially into the space betweenthe plunger and the die to form a tubular shell and at the same time to flow axially into the groove to interlock the shell 'with the cam-engaging member.
- valve tappet which consists in placing a base having a groove formed therein in a die, inserting a heated metal billet in the die adjacent the base, and then forcing a plunger into the billet thereby extruding the metal into the space between the plunger and the die to form a .tubular shell and also into the groove to interlock the base to the shell.
- valve tappet which consists in placing a cam-engaging member having an undercut annular groove formed therein in a die, inserting a heated metal billet in said die adjacent said member, and thenl forcing a plunger into said billet to cause the metal in the latter to flow axially into the space between the plunger and the die to form a tubular shell and at the same time to flow axially into the groove to interlock the cam-engaging member with the shell.
- the resulting tappet is very light in weight and yet provides a large amount of bearing area, thus preventing rapid wear'. Very little machining is necessary and consequently the ta pet may be produced very economically. bviously
Description
Marh1,1932., EWETHERALD A1,848,083
METHOD OF FORMING VALVE TAPPETS Filed Aug. 7, 1929 W, A www,
Patented Mar. 1, 1932 UNrriaD STATES .PATENT OFFICE CHARLES E. WETHERALD, OE FLINT, MICHIGAN, vAssIGrNoR To GENERAL MOTORS CORPORATION, oF DETROIT, MICHIGAN, A CORPORATION or' DELAWARE METHOD F FQRMING VALVE TAIETS Application led August 7, 1929.' Serial No. 384,067.
This invention relates to valve tappets and more particularly to that type of tappet in which the base or cam-engaging face is formed of one kind of metal, while the stem .5 or shell portion is formed of a different kind of metal.
It has long been recognized that while it is necessary to make the tappet sufficiently large in diameter to provide a proper area of 10 bearing surface between the tappet and the in which the upper portion is in the form of a tubular shell and the cam-engaging face is of some suitable material which will withstand the wear caused by the action of the cams against such face.V
x It has been' found that chilled cast iron or certain alloy steels are ideal materials to be employed in the base of such a tappet, since they possess the proper hardness to withstand the constant impact of the cams. It is not necessary or even desirable that the shell portion be formed of the same material as the base, since'when chilled cast iron is used it would greatly increase the cost to chill the entire outersurface of the tappet,in stead of merely the cam-engaging face. Obviously when alloy .steels'are employed, the cost would be greatly increased .were the entire tappet made of such material. Consequently the practical thing to do is to form the shell of somecheaper material. To cast the shell is not entirely satisfactory since the wall thickness must necessarily be greater and this of course increases the weight which is objectionable. Also, the outside surface of the shell requires considerable machining when cast and if the inside surface is not machined there is a possibility of slightly different weights in/the various tappets, due to molding inaccuracies. If theshell be made in the usual manner from solid steel stock, then a large amount of machining is necessary to remove the material in the center.
5 l It is therefore an obj ectof this invention to motey smooth and quiet performance. F or this reason, an ideal type of tappet is one.
provide a tappetin which the shell portion is .Y formed of solid stock by the extrusion process. In this process a heated billet of metal is placed in a die anda plunger is forced under considerable pressure into the billet, causing the metal in the latter to low axially into the space between the plunger and the die, thusforming a tubular shell. At thevv saine time, part of the metalin thebillet is forced into engagement with a groove formed in a base member of chilled cast iron, alloy steelor some other. suitable material, which has previously been-placed inthe die. The resulting tappet requires no machining other than a slight grinding operation on its eX- terior surface to provide a `proper bearing surface, and all vsuch tappets are necessarily .of exactly the same weight due to the method employed in their manufacture. Such tappets may be produced very rapidly and con- 70 seliently their cost is comparatively low.
' ther -objectsand advantages will be apparent upon referring to the specification and Y accompanying drawings, in which:
Fig. 1 is a fragmentary ,sectional view 75 through the center of the dies employed in the manufacture/of my improved tappet, showing the base and the heated billet in the die beforethe act of extrusion has taken place. l A
Fig. 2 is a view similar to Fig. 1, but showing the lposition of the parts after the act of extrusion.
Fig. 3 is afragmentary vertical section through a portion of an internal combustion '85 engine, showing my improved tappetv assembled therein.
The reference numeral 10 indicatesa stationary die having an aperture 12 therein of the same diameter as that of the tappet to be produced. A movable support 14 fits into the lower end of the aperture -12 and is adapted to be moved up or' down by any suitable means. A plunger 16.01 the same diameter as that of the inside of the' finished tappet 95 is removably mountedin a movable member 18 adapted to be reciprocated by any suitable means which willfurnish suicient pressure to accomplish the act of extrusion to be described later.
The first step in the production of the tappet is to form a base or cam-engaging member 20 of chilled cast iron, alloy steel or other suitable material. An annular groove 22, preferably undercut, is formed in the base. This base is placed in the aperture 12 in such position that the cam engaging face abuts against the support 14, with the groove 22 on the upper side. A billet 24 of any suitable metal, such as ordinary steel, is heated to a temperature sufficiently high to permit the metal to flow when placed under pressure.
This heated billet is just enough smaller in diameter than the diameter of the aperture 12 to permit it to be inserted therein, on top of the base 20.
The plunger 16 is then forced under pressure into the billet, and, since the metal cannot flow radially, it must ow axially downward into the groove 22, and upwardly into the space between the plunger 16 and the die 10. Due to the fact that the metal in the billetl cannot flow radially, there is no possibility of cracks developing in the outer surface of the metal due to expansion. The thickness of the billet is so proportioned that when the plunger has reached the bottom of its stroke,'the metal will have flowed upwardly to such a point as will produce a shell 25 of the desired length. The plunger is then withdrawn, and the tappet is ejected from the die by causing the support 14 to be moved upwardly.
It may not be necessary that the groove 22 be undercut, since when certain combinations Of metals are employed, the upper corner of` the base tends to expand outwardly during the act of extrusion, and thereby serves to lock the base and shell together. In this case an ordinary straight groove in the base is all that need be provided.
After removalfrom the die the outside surface of the shell and the cam-engaging face are ground to provide a smooth surface. In Fig. 3 the tappet is shown assembledin an engine 26. The valve operating push rod 28 or valve stem, as the case may be, ts
into an aperture 30 drilled through the low-A a tappet in which a shell of suitable material is quickly and cheaply formed, and at the in a die, inserting a metal -billet in the die adjacent the base, and then forcing a plunger into said billet to simultaneously cause the metal in the billet to flow into interlocking engagement with said base and to flow into the space between the plunger and the die to form the billet into a tubular shell.
2. The method of forming a valve tappet which consists in placing a cam-engagingl member' having a groove formed therein in a die, inserting a heated metal billet adjacent said member, and then forcing a plunger into said billet to cause the metal in the latter to flow axially into the space betweenthe plunger and the die to form a tubular shell and at the same time to flow axially into the groove to interlock the shell 'with the cam-engaging member.
3. The method of forming a valve tappet which consists in placing a base having a groove formed therein in a die, inserting a heated metal billet in the die adjacent the base, and then forcing a plunger into the billet thereby extruding the metal into the space between the plunger and the die to form a .tubular shell and also into the groove to interlock the base to the shell. 4,.'fThe method of forminga valve tappet which consists in placing a cam-engaging member having an undercut annular groove formed therein in a die, inserting a heated metal billet in said die adjacent said member, and thenl forcing a plunger into said billet to cause the metal in the latter to flow axially into the space between the plunger and the die to form a tubular shell and at the same time to flow axially into the groove to interlock the cam-engaging member with the shell.
In testimony whereof I affix my signature.
CHARLES E. WETHERALD.
same time is interlocked with a base of some I,
material which will provide a proper camengaging face. The resulting tappet is very light in weight and yet provides a large amount of bearing area, thus preventing rapid wear'. Very little machining is necessary and consequently the ta pet may be produced very economically. bviously
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US384067A US1848083A (en) | 1929-08-07 | 1929-08-07 | Method of forming valve tappets |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US384067A US1848083A (en) | 1929-08-07 | 1929-08-07 | Method of forming valve tappets |
Publications (1)
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US1848083A true US1848083A (en) | 1932-03-01 |
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US384067A Expired - Lifetime US1848083A (en) | 1929-08-07 | 1929-08-07 | Method of forming valve tappets |
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Cited By (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE742018C (en) * | 1937-05-27 | 1944-02-24 | Siemens Ag | Process for the production of components for electrotechnical purposes |
US2450803A (en) * | 1942-01-24 | 1948-10-05 | Thompson Prod Inc | Method of making sheathed valves |
US2621862A (en) * | 1950-05-03 | 1952-12-16 | Abbott Worsted Mills Inc | Thread guide mechanism |
US2810478A (en) * | 1952-04-18 | 1957-10-22 | Comptoir Ind Etirage | Extrusion of hollow bodies |
US2887098A (en) * | 1954-07-29 | 1959-05-19 | Earl A Thompson | Valve tappet |
US2891525A (en) * | 1955-08-01 | 1959-06-23 | Thompson Ramo Wooldridge Inc | Tappet barrel |
US2898666A (en) * | 1952-03-05 | 1959-08-11 | Olin Mathieson | Method of making bullets |
US2932290A (en) * | 1957-12-27 | 1960-04-12 | Harvey Machine Co Inc | Low inertia valve lifter unit and method of making the same |
DE1102847B (en) * | 1954-12-07 | 1961-03-23 | Alois Schiffmann Dipl Kfm | Process for the production of contact and corrosion-proof two-metal high-current terminals |
US2983991A (en) * | 1956-02-23 | 1961-05-16 | Chrysler Corp | Valve tappet and method of making |
US2988805A (en) * | 1954-07-29 | 1961-06-20 | Earl A Thompson | Art of making a tappet |
US3041718A (en) * | 1957-10-18 | 1962-07-03 | Metal Box Co Ltd | Manufacture of aluminium containers |
DE1134953B (en) * | 1957-10-18 | 1962-08-23 | Metal Box Co Ltd | Process for the production of a thin-walled metallic container by back extrusion |
US3075817A (en) * | 1961-02-28 | 1963-01-29 | Harvey Aluminum Inc | Reinforced light weight piston |
US3149410A (en) * | 1960-11-02 | 1964-09-22 | Gen Motors Corp | Valve lifter |
US3198182A (en) * | 1962-08-17 | 1965-08-03 | Gen Motors Corp | Valve lifter |
US3209437A (en) * | 1962-04-13 | 1965-10-05 | Voorhies Carl | Method of securing together two members |
US3222761A (en) * | 1957-11-29 | 1965-12-14 | Arrowhead Eng Corp | Process of forming cup-shaped articles |
US3235946A (en) * | 1957-11-18 | 1966-02-22 | Star Machine Inc | Process of fabricating piston heads for hydraulic brake cylinders |
FR2373354A1 (en) * | 1976-12-13 | 1978-07-07 | Nippert Co | BIMETALLIC RESISTANCE WELDING ELECTRODE AND ITS REALIZATION PROCESS |
FR2481621A1 (en) * | 1980-05-03 | 1981-11-06 | Alusuisse | METHOD FOR MANUFACTURING LIGHT METAL OBJECTS BY FORMING AND SHAPED PIECE HAVING LIGHT METAL COMPONENT |
FR2481620A1 (en) * | 1980-05-03 | 1981-11-06 | Alusuisse | PROCESS FOR MANUFACTURING LIGHT METAL OBJECTS BY FORMING, PARTICULARLY BY SPINNING AND DIE FORMING, AND LIGHT METAL COMPONENT WORKPIECE |
FR2533076A1 (en) * | 1982-09-13 | 1984-03-16 | Duracell Int | EXTRUDED HOUSING, MANUFACTURE AND USE THEREOF |
US4608742A (en) * | 1983-05-26 | 1986-09-02 | Parker Hannifin Corporation | Forged dissimilar metal assembly and method |
US4780948A (en) * | 1983-05-26 | 1988-11-01 | Parker-Hannifin Corporation | Forged dissimilar metal assembly and method |
US4829950A (en) * | 1986-04-30 | 1989-05-16 | Hitachi, Ltd. | Valve lifter and method of producing the same |
US5914057A (en) * | 1997-02-04 | 1999-06-22 | The Nippert Company | Resistance welding electrode and process for making |
US6225591B1 (en) | 1997-11-20 | 2001-05-01 | The Nippert Company | Resistance welding electrode and process for making |
US6871622B2 (en) | 2002-10-18 | 2005-03-29 | Maclean-Fogg Company | Leakdown plunger |
US7028654B2 (en) | 2002-10-18 | 2006-04-18 | The Maclean-Fogg Company | Metering socket |
US7128034B2 (en) | 2002-10-18 | 2006-10-31 | Maclean-Fogg Company | Valve lifter body |
US7191745B2 (en) | 2002-10-18 | 2007-03-20 | Maclean-Fogg Company | Valve operating assembly |
US7273026B2 (en) | 2002-10-18 | 2007-09-25 | Maclean-Fogg Company | Roller follower body |
US10119607B2 (en) | 2016-04-15 | 2018-11-06 | Koyo Bearings North America Llc | Follower mechanism |
US11143059B2 (en) | 2019-10-03 | 2021-10-12 | Koyo Bearings North America Llc | Tappet assembly with unground outer cup |
US11149593B2 (en) | 2019-10-03 | 2021-10-19 | Koyo Bearings North America Llc | Tappet assembly with formed anti-rotation alignment device |
US11229934B2 (en) * | 2019-01-17 | 2022-01-25 | Ford Global Technologies, Llc | Methods of forming fiber-reinforced composite parts and fiber-reinforced composite parts formed thereby |
-
1929
- 1929-08-07 US US384067A patent/US1848083A/en not_active Expired - Lifetime
Cited By (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE742018C (en) * | 1937-05-27 | 1944-02-24 | Siemens Ag | Process for the production of components for electrotechnical purposes |
US2450803A (en) * | 1942-01-24 | 1948-10-05 | Thompson Prod Inc | Method of making sheathed valves |
US2621862A (en) * | 1950-05-03 | 1952-12-16 | Abbott Worsted Mills Inc | Thread guide mechanism |
US2898666A (en) * | 1952-03-05 | 1959-08-11 | Olin Mathieson | Method of making bullets |
US2810478A (en) * | 1952-04-18 | 1957-10-22 | Comptoir Ind Etirage | Extrusion of hollow bodies |
US2887098A (en) * | 1954-07-29 | 1959-05-19 | Earl A Thompson | Valve tappet |
US2988805A (en) * | 1954-07-29 | 1961-06-20 | Earl A Thompson | Art of making a tappet |
DE1102847B (en) * | 1954-12-07 | 1961-03-23 | Alois Schiffmann Dipl Kfm | Process for the production of contact and corrosion-proof two-metal high-current terminals |
US2891525A (en) * | 1955-08-01 | 1959-06-23 | Thompson Ramo Wooldridge Inc | Tappet barrel |
US2983991A (en) * | 1956-02-23 | 1961-05-16 | Chrysler Corp | Valve tappet and method of making |
US3041718A (en) * | 1957-10-18 | 1962-07-03 | Metal Box Co Ltd | Manufacture of aluminium containers |
DE1134953B (en) * | 1957-10-18 | 1962-08-23 | Metal Box Co Ltd | Process for the production of a thin-walled metallic container by back extrusion |
US3235946A (en) * | 1957-11-18 | 1966-02-22 | Star Machine Inc | Process of fabricating piston heads for hydraulic brake cylinders |
US3222761A (en) * | 1957-11-29 | 1965-12-14 | Arrowhead Eng Corp | Process of forming cup-shaped articles |
US2932290A (en) * | 1957-12-27 | 1960-04-12 | Harvey Machine Co Inc | Low inertia valve lifter unit and method of making the same |
US3149410A (en) * | 1960-11-02 | 1964-09-22 | Gen Motors Corp | Valve lifter |
US3075817A (en) * | 1961-02-28 | 1963-01-29 | Harvey Aluminum Inc | Reinforced light weight piston |
US3209437A (en) * | 1962-04-13 | 1965-10-05 | Voorhies Carl | Method of securing together two members |
US3198182A (en) * | 1962-08-17 | 1965-08-03 | Gen Motors Corp | Valve lifter |
FR2373354A1 (en) * | 1976-12-13 | 1978-07-07 | Nippert Co | BIMETALLIC RESISTANCE WELDING ELECTRODE AND ITS REALIZATION PROCESS |
FR2481621A1 (en) * | 1980-05-03 | 1981-11-06 | Alusuisse | METHOD FOR MANUFACTURING LIGHT METAL OBJECTS BY FORMING AND SHAPED PIECE HAVING LIGHT METAL COMPONENT |
FR2481620A1 (en) * | 1980-05-03 | 1981-11-06 | Alusuisse | PROCESS FOR MANUFACTURING LIGHT METAL OBJECTS BY FORMING, PARTICULARLY BY SPINNING AND DIE FORMING, AND LIGHT METAL COMPONENT WORKPIECE |
FR2533076A1 (en) * | 1982-09-13 | 1984-03-16 | Duracell Int | EXTRUDED HOUSING, MANUFACTURE AND USE THEREOF |
US4608742A (en) * | 1983-05-26 | 1986-09-02 | Parker Hannifin Corporation | Forged dissimilar metal assembly and method |
US4780948A (en) * | 1983-05-26 | 1988-11-01 | Parker-Hannifin Corporation | Forged dissimilar metal assembly and method |
US4829950A (en) * | 1986-04-30 | 1989-05-16 | Hitachi, Ltd. | Valve lifter and method of producing the same |
US5914057A (en) * | 1997-02-04 | 1999-06-22 | The Nippert Company | Resistance welding electrode and process for making |
USRE40265E1 (en) * | 1997-02-04 | 2008-04-29 | Luvata Ohio, Inc. | Resistance welding electrode and process for making |
US6225591B1 (en) | 1997-11-20 | 2001-05-01 | The Nippert Company | Resistance welding electrode and process for making |
US7191745B2 (en) | 2002-10-18 | 2007-03-20 | Maclean-Fogg Company | Valve operating assembly |
US7128034B2 (en) | 2002-10-18 | 2006-10-31 | Maclean-Fogg Company | Valve lifter body |
US7028654B2 (en) | 2002-10-18 | 2006-04-18 | The Maclean-Fogg Company | Metering socket |
US7273026B2 (en) | 2002-10-18 | 2007-09-25 | Maclean-Fogg Company | Roller follower body |
US7281329B2 (en) | 2002-10-18 | 2007-10-16 | Maclean-Fogg Company | Method for fabricating a roller follower assembly |
US7284520B2 (en) | 2002-10-18 | 2007-10-23 | Maclean-Fogg Company | Valve lifter body and method of manufacture |
US6871622B2 (en) | 2002-10-18 | 2005-03-29 | Maclean-Fogg Company | Leakdown plunger |
US10119607B2 (en) | 2016-04-15 | 2018-11-06 | Koyo Bearings North America Llc | Follower mechanism |
US10385957B2 (en) | 2016-04-15 | 2019-08-20 | Koyo Bearings North America Llc | Follower mechanism |
US11229934B2 (en) * | 2019-01-17 | 2022-01-25 | Ford Global Technologies, Llc | Methods of forming fiber-reinforced composite parts and fiber-reinforced composite parts formed thereby |
US11143059B2 (en) | 2019-10-03 | 2021-10-12 | Koyo Bearings North America Llc | Tappet assembly with unground outer cup |
US11149593B2 (en) | 2019-10-03 | 2021-10-19 | Koyo Bearings North America Llc | Tappet assembly with formed anti-rotation alignment device |
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