US3825146A - Method for closing bores at workpieces and improved plug constructions for the performance of the aforesaid method - Google Patents

Method for closing bores at workpieces and improved plug constructions for the performance of the aforesaid method Download PDF

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US3825146A
US3825146A US00159647A US15964771A US3825146A US 3825146 A US3825146 A US 3825146A US 00159647 A US00159647 A US 00159647A US 15964771 A US15964771 A US 15964771A US 3825146 A US3825146 A US 3825146A
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Prior art keywords
plug
sleeve
bore
ball
expanding member
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US00159647A
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G Hirmann
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Koenig AG
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Koenig AG
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Priority claimed from CH1031370A external-priority patent/CH508828A/en
Priority to NL7109253A priority Critical patent/NL7109253A/xx
Application filed by Koenig AG filed Critical Koenig AG
Priority to US00159647A priority patent/US3825146A/en
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    • 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
    • F16J13/02—Detachable closure members; Means for tightening closures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D39/00—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
    • B65D39/12—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers expansible, e.g. inflatable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D59/00—Plugs, sleeves, caps, or like rigid or semi-rigid elements for protecting parts of articles or for bundling articles, e.g. protectors for screw-threads, end caps for tubes or for bundling rod-shaped articles
    • B65D59/02—Plugs
    • 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
    • F16J13/02—Detachable closure members; Means for tightening closures
    • F16J13/12—Detachable closure members; Means for tightening closures attached by wedging action by means of screw-thread, interrupted screw-thread, bayonet closure, or the like
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/10—Means for stopping flow from or in pipes or hoses
    • F16L55/12—Means for stopping flow from or in pipes or hoses by introducing into the pipe a member expandable in situ
    • F16L55/128—Means for stopping flow from or in pipes or hoses by introducing into the pipe a member expandable in situ introduced axially into the pipe or hose
    • F16L55/13—Means for stopping flow from or in pipes or hoses by introducing into the pipe a member expandable in situ introduced axially into the pipe or hose the closure device being a plug fixed by plastic deformation
    • 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
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body

Definitions

  • Patent 7 [191 v irmann 451v July 23, 1974 [54] METHOD FOR CLOSING BORES AT 2,821,323 l/l958 Lee 220/24.5 WORKPIECES AND IMPROVED PLUG 2,855,003 10/1958 Thaxton.... 220/245 3,451,583 6/1969 Lee l 220/245 CONSTRUCTIONS FOR THE 3,525,453 8/1970 Lee 220/245 PERFORMANCE OF THE AFORESAID METHOD Inventor: Georg Hirmann, Zurich,
  • ABSTRACT A plug for closing the bores of workpieces as well as a method for closing such bores wherein there is provided a plug sleeve which is inserted into the bore of 12 Claims, 6 Drawing Figures PATENTEUJULNW 4 3.825.146
  • the present invention relates to a new and improved method for closing bores in or at workpieces with the aid of a radially expandable plug which can be inserted in such bore. Additionally, this invention is concerned with improved plug constructions for the performance of the aforesaid method.
  • a drawback of this state-of-the-art construction of plug and its mode of insertion into the bore to be closed is that it is necessary to exert a relatively large driving force upon the pin, since with the same conicalness of the inside taper and the pin the entire length of the plug wall must simultaneously come to bear against the bore and the entire length of the outside surface or jacket of the plug must be simultaneously expanded. Additionally, the friction between the inside taper of the plug and the pin is very large during such time as the pin is driven into the plug, so that the practically attainable holding force of the plug in the'bore and its sealing action are limited.
  • a primary objective of the present invention is to reduce the force which is required for expanding the plug and to improve upon its retention within the bore.
  • Still a further significant object of the present invention is directed to a novel method of sealing a bore at a workpiece which improves upon the prior art techniques discussed above, and further relates to improved constructions of plugs for carrying out the inventive method.
  • Another significant object of the present invention relatesto a novel plug design for use in the sealing of bores wherein the plug is constructed such that it is progressively radially expanded in axial direction after it has been placed within the bore which is to be sealed.
  • the method aspects thereof contemplate progressively radially expanding the sleeve member of the plug in axial direction after insertion of the its broader sense to mean a crownedor spherical like the bores while expending a comparatively slight amount of force.
  • Plugs of this type are especially suitable for sealing or closing bores in conduit systems through which there is conveyed liquid or gas under pressure. Therefore, the utilization of the method aspects of this development as well as the plugs constructed in accordance with this invention in the field of hydraulic and pneumatic power'transmissionand control systems as well as in coolingand lubricating systems has found to be particularly advantageous.
  • the invention has vast applicability in a number of different environments, particularly when it is desired to close or seal a'bore within any type of workpiece, whether such be a conduit, duct, channel, chamber or otherwise.
  • FIG. 1 is a longitudinal sectional view through a plug together with its plug expanding element here shown in the form of a sphere or ball and in a condition prior to insertion of this plug construction into the bore of a workpiece;
  • FIG. 2 is a fragmentary longitudinal sectional view through a plug of the type shown in FIG. 1 but this time inserted in the bore of the workpiece and wherein the expanding ball or sphere has been driven into the interior of the plug;
  • FIG. 3 is a longitudinal sectional view analogous to the showing of FIG. 2 but through a modified version of plug employing a funnel-shaped bottom or floor;
  • FIG. 4 is a longitudinal sectional view, again analogous to the showing of FIG. 2, through a further embodiment of plug equipped with an outwardly projecting collar;
  • FIG. 5 is a longitudinal sectional view through an embodiment of plug having a turned-in or rolled-in flange or edge;
  • FIG. 6 is an enlarged schematic illustration of the rolling or squeezing movement during penetration of the teeth of the plug into the material bounding the bore of the workpiece.
  • FIG. 1 the exemplary embodiment of plug construction serving for the closing of bores as illustrated in FIG. 1 will be seen to encompass an expandable sleeve or jacket 1 and an expanding member, here shown in the form of a ball or sphere 2, which is inserted in the expandable sleeve 1.
  • the ball 2 is fixedly retained at the region of the sleeve opening 17 by providing a slightly inwardly turned or flanged marginal edge 3, as shown.
  • a number of substantially ring-shaped, sharp-edged teeth or ribs 8 defining an-.
  • Teeth 8 are preferably fabricated at the sleeve 1 by a rolling or tapping operation.
  • the inside diameter of the cylindrical bore 6 of the sleeve 1 is somewhat smaller than the diameter of the ball or sphere 2.
  • the floor or bottom 9 of the plug sleeve 1 possesses a larger wall thickness than the side walls 18 of such sleeve.
  • FIG. 1 which has me viously mounted therein a ball or a sphere 2 serving as the plug expanding element is destined to be inserted into the bore 10 of any suitable workpiece 4.
  • this bore 10 of the workpiece 4 is bored out, corresponding to the length of the plug itself and so as to possess a diameter which corresponds to the outside diameter of the plug sleeve 1.
  • a shoulder 5 against which bears the plug when it is inserted therein is formed.
  • the sleeve I l is expanded with the aid of the expanding ball 2. This can be accomplished by driving the ball 2 into the interior of the sleeve 1, for instance with the aid of a suitable mandrel or punch, and until this ball 2 has approximately assumed the position illustrated in FIG. 2.
  • the length of the path through which the ball 2 should be displaced should at least correspond to one-half of the diameter of such a ball. Owing to the driving of the ball 2 into the bore 6 of the plug sleeve 1 and in the direction of the bottom 9 the ring-shaped teeth 8 will tend to dig into the material of the workpiece 4, thereby ensuring that the plug sleeve 1 will be fixedly retained within the bore 10 of the workpiece 4.
  • the force required for driving the ball 2 into the sleeve 1 is relatively low.
  • the material of the plug which consists of metal is chosen such that it possesses a relatively slight tendency to spring back into its original state after it has been expanded by the ball 2, thereby preventing any springing back of the region of the sleeve which is behind the ball.
  • FIG. 3 illustrates a modified form of inventive plug which can be particularly well manufactured in accordance with a deep-drawing technique.
  • the plug sleeve 1 is provided at the region of its floor or base 9 with a funnel-like construction 20 which, on the one hand, functions as a stop means for the ball 2 which has been driven into the bore 6 of such plug sleeve 1 and, on the other hand, provides the function that this funnel-shaped floor 9 tends to spread under the action of the ball which is driven against the tip of the funnel-shaped portion 20, and therefore provides an additional anchoring and sealing of the plug within the bore 10 of the workpiece 4.
  • the plug sleeve 1 is provided at the side of the opening 17 with an outwardly depending or extending collar or flange 11.
  • the depending collar or flange 11 bears against the end portion 12 of the workpiece 4.
  • the collar 11 must be dimensioned so strongly that it is capable of taking up the forces which are applied when the ball 2 is driven into the bore of the plug sleeve 1.
  • the floor or bottom 9 of the plug sleeve 1 is provided with an opening 13.
  • the marginal edge 14 of such sleeve is simultaneously turned or flanged inwardly.
  • the space or compartment 16 thus formed within the confines of the inwardly flanged sleeve 1 can be equipped with a suitable sealing means, which may be liquid or pasty or such space 16 can be provided with a rubber-elastic sealing ring, all as merely schematically indicated byreference character 21.
  • FIG. 6 schematically illustrates the manner in which the teeth 8 successively carry out a certain rolling or squeezing movement during the movement of the expanding means, namely the ball or sphere 2 in the direction of the arrow A through the inner bore 6 of the plug sleeve 1.
  • This rolling or squeezing motion of the teeth 8 facilitates the penetration of the teeth 8 into the material surrounding the bore 10 of the workpiece 4.
  • the sawtoothshaped teeth 8 are rocked through an angle 0: so that during the expanding operation movement of these teeth occur.
  • each of the teeth 8 are located along a respective cone which enlarges in diameter in the direction of the opening 17 of the plug sleeve 1.
  • a plug for closing the bores of workpieces comprising a plug sleeve having a plug bore and destined to be inserted into a bore of the workpiece which is to be closed, the outside surface of said plug sleeve being equipped with means for engaging with the material of the confining wall of the bore of the workpiece to anchor the plug sleeve in the workpiece bore, an expanding member which can be driven into the bore of the plug sleeve for radially expanding said plug sleeve, said expanding member being a ball possessing a substantially ball-like configuration at least at the region intended to bear against said bore of the plug sleeve, and wherein said bore of said plug sleeve possesses at least an approximately cylindrical configuration, and
  • said plug sleeve has an opening for receiving said ball in a pre-mounted position within the plug bore, said ball in said pre-mounted position being fixedly retained at said opening of the plug sleeve by an inwardly flanged sleeve portion.
  • a plug for closing bores of workpieces comprising a substantially cylindrical plug sleeve of substantially rigid deformable material having a base end and an open end, said open end communicating with an axially extending bore in said sleeve, the outside surface of said sleeve having an annular anchoring portion including a plurality of axially spaced annularridges, the bore of said sleeve possessing a substantially cylindrical portion extending between said open end of said sleeve and said base end, an expanding member adapted to be driven into said cylindrical portion of said bore of the sleeve and possessing a substantially ball-like configuration at least at the region thereof directed toward said base end and having its largest diameter larger than the diameter of said cylindrical portion of said bore, to permanently expand and anchor axially successive ones of said annular ridges in the confining wall of the bore of the workpiece when driving said expanding member from said open end towards said base end of said sleeve within said cylindrical portion of said bore to progressively radially expand said s
  • annulat ridges each have a sawtooth-shaped profile, each of said sawtooth-shaped ridges having an edge situated upon a cone which increases in diameter in the direction of said open end of said plug sleeve.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pipe Accessories (AREA)

Abstract

A plug for closing the bores of workpieces as well as a method for closing such bores wherein there is provided a plug sleeve which is inserted into the bore of the workpiece. An expanding member is driven into the bore of the plug sleeve for progressively radially expanding the plug in the axial direction thereof. This causes anchoring means at the outside surface of the sleeve to fixedly engage with the material of the wall of the bore of the workpiece. The expanding member should possess a substantially ball-like configuration at least at the region intended to bear against the bore of the plug sleeve. This expanding member may be preferably in the form of a ball.

Description

nited States, Patent 7 [191 v irmann 451v July 23, 1974 [54] METHOD FOR CLOSING BORES AT 2,821,323 l/l958 Lee 220/24.5 WORKPIECES AND IMPROVED PLUG 2,855,003 10/1958 Thaxton.... 220/245 3,451,583 6/1969 Lee l 220/245 CONSTRUCTIONS FOR THE 3,525,453 8/1970 Lee 220/245 PERFORMANCE OF THE AFORESAID METHOD Inventor: Georg Hirmann, Zurich,
Switzerland Assignee: Dr. lng. Koenlg AG, Dietikon,
Switzerland Filed: July 6, 1971 Appl. No.: 159,647
U.S. Cl. 220/245, 29/522 Int. Cl 865d 39/12 Field of Search 29/522, 523, 521, 507;
References Cited UNITED STATES PATENTS 11/1951 Zimmerman 220/245 Primary Examiner-George E. Lowrance Attorney, Agent, or FirmWerner W. Kleeman [57] ABSTRACT A plug for closing the bores of workpieces as well as a method for closing such bores wherein there is provided a plug sleeve which is inserted into the bore of 12 Claims, 6 Drawing Figures PATENTEUJULNW 4 3.825.146
SHEET 1 [if 3 PAIEMEDM 3.825.146
SHEET 2 0F 3 (((QQQQ PAIEmmJum Sis-25.146
SHEET 3 0F '3 '1 METHOD FOR CLOSING BORIES AT WORKPIECES AND IMPROVED PLUG CONSTRUCTIONS FOR THE PERFORMANCE OF THE AFORESAID METHOD BACKGROUND or THE INVENTION The present invention relates to a new and improved method for closing bores in or at workpieces with the aid of a radially expandable plug which can be inserted in such bore. Additionally, this invention is concerned with improved plug constructions for the performance of the aforesaid method.
It is already known to the art to insert a hollow plug which is closed at its bottom into a stepped bore of a metallic workpiece for the purpose of sealing or closing such bore. This plug is provided with an inside taper or cone. Thereafter, through the application of force upon a conical pin this pin is driven internally into the plug. Due to such action the walls of the plug are spread apart, and owing to such expansion this plug is fixedly seated in the bore. A drawback of this state-of-the-art construction of plug and its mode of insertion into the bore to be closed is that it is necessary to exert a relatively large driving force upon the pin, since with the same conicalness of the inside taper and the pin the entire length of the plug wall must simultaneously come to bear against the bore and the entire length of the outside surface or jacket of the plug must be simultaneously expanded. Additionally, the friction between the inside taper of the plug and the pin is very large during such time as the pin is driven into the plug, so that the practically attainable holding force of the plug in the'bore and its sealing action are limited.
SUMMARY OF THEINVENTION Therefore, a primary objective of the present invention is to reduce the force which is required for expanding the plug and to improve upon its retention within the bore. I
Still a further significant object of the present invention is directed to a novel method of sealing a bore at a workpiece which improves upon the prior art techniques discussed above, and further relates to improved constructions of plugs for carrying out the inventive method.
Another significant object of the present invention relatesto a novel plug design for use in the sealing of bores wherein the plug is constructed such that it is progressively radially expanded in axial direction after it has been placed within the bore which is to be sealed.
Now, in keeping with the aforementioned objectives of this invention the method aspects thereof contemplate progressively radially expanding the sleeve member of the plug in axial direction after insertion of the its broader sense to mean a crownedor spherical like the bores while expending a comparatively slight amount of force. Plugs of this type are especially suitable for sealing or closing bores in conduit systems through which there is conveyed liquid or gas under pressure. Therefore, the utilization of the method aspects of this development as well as the plugs constructed in accordance with this invention in the field of hydraulic and pneumatic power'transmissionand control systems as well as in coolingand lubricating systems has found to be particularly advantageous. Those skilled in this particular art will recognize that the invention has vast applicability in a number of different environments, particularly when it is desired to close or seal a'bore within any type of workpiece, whether such be a conduit, duct, channel, chamber or otherwise.
BRIEF DESCRIPTION-OF THE DRAWINGS The invention will be better understood and objects other than those set forth above will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings, wherein:
FIG. 1 is a longitudinal sectional view through a plug together with its plug expanding element here shown in the form of a sphere or ball and in a condition prior to insertion of this plug construction into the bore of a workpiece;
FIG. 2 is a fragmentary longitudinal sectional view through a plug of the type shown in FIG. 1 but this time inserted in the bore of the workpiece and wherein the expanding ball or sphere has been driven into the interior of the plug;
FIG. 3 is a longitudinal sectional view analogous to the showing of FIG. 2 but through a modified version of plug employing a funnel-shaped bottom or floor;
FIG. 4 is a longitudinal sectional view, again analogous to the showing of FIG. 2, through a further embodiment of plug equipped with an outwardly projecting collar;
FIG. 5 is a longitudinal sectional view through an embodiment of plug having a turned-in or rolled-in flange or edge; and
FIG. 6 is an enlarged schematic illustration of the rolling or squeezing movement during penetration of the teeth of the plug into the material bounding the bore of the workpiece.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Deseribingnow the drawings, the exemplary embodiment of plug construction serving for the closing of bores as illustrated in FIG. 1 will be seen to encompass an expandable sleeve or jacket 1 and an expanding member, here shown in the form of a ball or sphere 2, which is inserted in the expandable sleeve 1. The ball 2 is fixedly retained at the region of the sleeve opening 17 by providing a slightly inwardly turned or flanged marginal edge 3, as shown. A number of substantially ring-shaped, sharp-edged teeth or ribs 8 defining an-. choring ridges are provided at the outer periphery of the sleeve lat the central region thereof, these teeth 8 possessing a preferably sawtooth-like configuration and being arranged in tandem or behind one another. Teeth 8 are preferably fabricated at the sleeve 1 by a rolling or tapping operation. The inside diameter of the cylindrical bore 6 of the sleeve 1 is somewhat smaller than the diameter of the ball or sphere 2. Furthermore, the floor or bottom 9 of the plug sleeve 1 possesses a larger wall thickness than the side walls 18 of such sleeve.
Now, the plug construction of FIG. 1 which has me viously mounted therein a ball or a sphere 2 serving as the plug expanding element is destined to be inserted into the bore 10 of any suitable workpiece 4. Accordingly, this bore 10 of the workpiece 4 is bored out, corresponding to the length of the plug itself and so as to possess a diameter which corresponds to the outside diameter of the plug sleeve 1. Through the provision of this bore 10 at the workpiece 4 there is formed a shoulder 5 against which bears the plug when it is inserted therein. Now, in order to ensure thatthe plug itself will remain non-displaceably and sealingly seated within the workpiece bore and also will be capable of withstanding considerable pressure within such bore, for
instance for valves of hydraulic installations, the sleeve I l is expanded with the aid of the expanding ball 2. This can be accomplished by driving the ball 2 into the interior of the sleeve 1, for instance with the aid of a suitable mandrel or punch, and until this ball 2 has approximately assumed the position illustrated in FIG. 2. The length of the path through which the ball 2 should be displaced should at least correspond to one-half of the diameter of such a ball. Owing to the driving of the ball 2 into the bore 6 of the plug sleeve 1 and in the direction of the bottom 9 the ring-shaped teeth 8 will tend to dig into the material of the workpiece 4, thereby ensuring that the plug sleeve 1 will be fixedly retained within the bore 10 of the workpiece 4. Owing to the fact that not all of the teeth 8 simultaneously penetrate into the material of the walls surrounding the bore 10 of the workpiece 4, rather there is a progressive penetration of such teeth owing to the movement of the ball 2 progressively in the axial direction as it is being driven into the bore 6 of the plug sleeve 1, the force required for driving the ball 2 into the sleeve 1 is relatively low.The material of the plug which consists of metal is chosen such that it possesses a relatively slight tendency to spring back into its original state after it has been expanded by the ball 2, thereby preventing any springing back of the region of the sleeve which is behind the ball.
FIG. 3 illustrates a modified form of inventive plug which can be particularly well manufactured in accordance with a deep-drawing technique. It will be seen that the plug sleeve 1 is provided at the region of its floor or base 9 with a funnel-like construction 20 which, on the one hand, functions as a stop means for the ball 2 which has been driven into the bore 6 of such plug sleeve 1 and, on the other hand, provides the function that this funnel-shaped floor 9 tends to spread under the action of the ball which is driven against the tip of the funnel-shaped portion 20, and therefore provides an additional anchoring and sealing of the plug within the bore 10 of the workpiece 4.
With the embodiment of plug construction as depicted in FIG. 4 the plug sleeve 1 is provided at the side of the opening 17 with an outwardly depending or extending collar or flange 11. Hence, when the sleeve 1 of this plug construction is inserted into the bore 10 of the workpiece 4 the depending collar or flange 11 bears against the end portion 12 of the workpiece 4. The collar 11 must be dimensioned so strongly that it is capable of taking up the forces which are applied when the ball 2 is driven into the bore of the plug sleeve 1. With this arrangement and owing to the provision of the depending collar 11 it is not necessary, as was the case with the embodiments of FIGS. 1 to 3, to bore out the workpiece bore 10 such that it has a stepped configuration.
Now with the embodiment of plug construction as depicted in FIG. 5 the floor or bottom 9 of the plug sleeve 1 is provided with an opening 13. During such time as the ball or sphere 2 is driven into the bore 6 of the sleeve 1 the marginal edge 14 of such sleeve is simultaneously turned or flanged inwardly. Useful as a tool for achieving this effect is a mandrel 15, shown to the right of FIG. 5, and which is equipped with a ring shaped groove 18. In order to provide a reliable seal, the space or compartment 16 thus formed within the confines of the inwardly flanged sleeve 1 can be equipped with a suitable sealing means, which may be liquid or pasty or such space 16 can be provided with a rubber-elastic sealing ring, all as merely schematically indicated byreference character 21.
FIG. 6 schematically illustrates the manner in which the teeth 8 successively carry out a certain rolling or squeezing movement during the movement of the expanding means, namely the ball or sphere 2 in the direction of the arrow A through the inner bore 6 of the plug sleeve 1. This rolling or squeezing motion of the teeth 8, even though it is relatively small, facilitates the penetration of the teeth 8 into the material surrounding the bore 10 of the workpiece 4. During the axial movement of the ball 2 and the therewith associated expansion of the material of the plug sleeve 1 the sawtoothshaped teeth 8 are rocked through an angle 0: so that during the expanding operation movement of these teeth occur.
It might here be mentioned that the ridge or spine 7 of each of the teeth 8 are located along a respective cone which enlarges in diameter in the direction of the opening 17 of the plug sleeve 1.
Instead of using a ball or sphere as the expanding element for the plug it would be possible to use a different configured or designed expansion element which is provided with a ball-like or crown-like portion at the region of the bore 6 of the plug.
While there is shown and described present preferred embodiments of the invention, it is to be distinctly understood that the invention is not limited thereto but may be otherwise variously embodied and practiced within the scope of the following claims.
What is claimed is:
l. A plug for closing the bores of workpieces, comprising a plug sleeve having a plug bore and destined to be inserted into a bore of the workpiece which is to be closed, the outside surface of said plug sleeve being equipped with means for engaging with the material of the confining wall of the bore of the workpiece to anchor the plug sleeve in the workpiece bore, an expanding member which can be driven into the bore of the plug sleeve for radially expanding said plug sleeve, said expanding member being a ball possessing a substantially ball-like configuration at least at the region intended to bear against said bore of the plug sleeve, and wherein said bore of said plug sleeve possesses at least an approximately cylindrical configuration, and
5. wherein said plug sleeve has an opening for receiving said ball in a pre-mounted position within the plug bore, said ball in said pre-mounted position being fixedly retained at said opening of the plug sleeve by an inwardly flanged sleeve portion.
2. The plug as defined in claim 1, wherein said ball is displaceably mounted in said plug bore for travel through a path of displacement in axial direction between its pre-mounted position and until impact against the floor of the plug sleeve which corresponds to at least approximately one-half of the diameter of said ball.
3. A plug for closing bores of workpieces, comprising a substantially cylindrical plug sleeve of substantially rigid deformable material having a base end and an open end, said open end communicating with an axially extending bore in said sleeve, the outside surface of said sleeve having an annular anchoring portion including a plurality of axially spaced annularridges, the bore of said sleeve possessing a substantially cylindrical portion extending between said open end of said sleeve and said base end, an expanding member adapted to be driven into said cylindrical portion of said bore of the sleeve and possessing a substantially ball-like configuration at least at the region thereof directed toward said base end and having its largest diameter larger than the diameter of said cylindrical portion of said bore, to permanently expand and anchor axially successive ones of said annular ridges in the confining wall of the bore of the workpiece when driving said expanding member from said open end towards said base end of said sleeve within said cylindrical portion of said bore to progressively radially expand said sleeve, said open end having a seat enlarged with respect to the diameter of the cylindrical portion of the sleeve to receive said expanding member.
4. The plug as defined in claim 3, wherein said annulat ridges each have a sawtooth-shaped profile, each of said sawtooth-shaped ridges having an edge situated upon a cone which increases in diameter in the direction of said open end of said plug sleeve.
5. The plug as defined in claim 3, wherein said ridges are only disposed at the central region of the length of said plug sleeve.
6. The plug as defined in claim 3, wherein said base end of said plug sleeve has a floor portion possessing a substantially funnel-shaped configuration and which extends inwardly towards the lengthwise axis of the bore of the plug sleeve and serves as stop means for said expanding member.
7. The plug as defined in claim 3, wherein said expanding member is a ball.
8. The plug as defined in claim 7, wherein said ball is fixedly retained in said seat by an inwardly flanged v sleeve portion in a pre-mounted position.
9. The plug as defined in claim 8, wherein said ball is displaceably mounted in said plug bore for travel through a path of displacement in axial direction between its pre-mounted position and until impact against the floor of the plug sleeve which corresponds to at least approximately one-half of the diameter of said ball. 1
10. The plug as defined in claim 3, wherein said open end of said sleeve is provided with a collar which extends radially outwardly of said sleeve.
11. The plug as defined in claim 3, wherein said open end of said sleeve possesses an inwardly turned edge.
of the plugsleeve being provided with sealing means.

Claims (12)

1. A plug for closing the bores of workpieces, comprising a plug sleeve having a plug bore and destined to be inserted into a bore of the workpiece which is to be closed, the outside surface of said plug sleeve being equipped with means for engaging with the material of the confining wall of the bore of the workpiece to anchor the plug sleeve in the workpiece bore, an expanding member which can be driven into the bore of the plug sleeve for radially expanding said plug sleeve, said expanding member being a ball possessing a substantially ball-like configuration at least at the region intended to bear against said bore of the plug sleeve, and wherein said bore of said plug sleeve possesses at least an approximately cylindrical configuration, and wherein said plug sleeve has an opening for receiving said ball in a pre-mounted position within the plug bore, said ball in said pre-mounted position being fixedly retained at said opening of the plug sleeve by an inwardly flanged sleeve portion.
2. The plug as defined in claim 1, wherein said ball is displaceably mounted in said plug bore for travel through a path of displacement in axial direction between its pre-mounted position and until impact against the floor of the plug sleeve which corresponds to at least approximately one-half of the diameter of said ball.
3. A plug for closing bores of workpieces, comprising a substantially cylindrical plug sleeve of substantially rigid deformable material having a base end and an open end, said open end communicating with an axially extending bore in said sleeve, the outside surface of said sleeve having an annular anchoring portion including a plurality of axially spaced annular ridges, the bore of said sleeve possessing a substantially cylindrical portion extending between said open end of said sleeve and said base end, an expanding member adapted to be driven into said cylindrical portion of said bore of the sleeve and possessing a substantially ball-like configuration at least at the region thereof directed toward said base end and having its largest diameter larger than the diameter of said cylindrical portion of said bore, to permanently expand and anchor axially successIve ones of said annular ridges in the confining wall of the bore of the workpiece when driving said expanding member from said open end towards said base end of said sleeve within said cylindrical portion of said bore to progressively radially expand said sleeve, said open end having a seat enlarged with respect to the diameter of the cylindrical portion of the sleeve to receive said expanding member.
4. The plug as defined in claim 3, wherein said annular ridges each have a sawtooth-shaped profile, each of said sawtooth-shaped ridges having an edge situated upon a cone which increases in diameter in the direction of said open end of said plug sleeve.
5. The plug as defined in claim 3, wherein said ridges are only disposed at the central region of the length of said plug sleeve.
6. The plug as defined in claim 3, wherein said base end of said plug sleeve has a floor portion possessing a substantially funnel-shaped configuration and which extends inwardly towards the lengthwise axis of the bore of the plug sleeve and serves as stop means for said expanding member.
7. The plug as defined in claim 3, wherein said expanding member is a ball.
8. The plug as defined in claim 7, wherein said ball is fixedly retained in said seat by an inwardly flanged sleeve portion in a pre-mounted position.
9. The plug as defined in claim 8, wherein said ball is displaceably mounted in said plug bore for travel through a path of displacement in axial direction between its pre-mounted position and until impact against the floor of the plug sleeve which corresponds to at least approximately one-half of the diameter of said ball.
10. The plug as defined in claim 3, wherein said open end of said sleeve is provided with a collar which extends radially outwardly of said sleeve.
11. The plug as defined in claim 3, wherein said open end of said sleeve possesses an inwardly turned edge.
12. The plug as defined in claim 11, wherein the floor of the sleeve is provided with an opening, said expanding member being a ball, and the intermediate space between the ball and the inner wall bounding the bore of the plug sleeve being provided with sealing means.
US00159647A 1970-07-08 1971-07-06 Method for closing bores at workpieces and improved plug constructions for the performance of the aforesaid method Expired - Lifetime US3825146A (en)

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CH1031370A CH508828A (en) 1970-07-08 1970-07-08 Method for closing bores in workpieces and plugs for carrying out the method
US00159647A US3825146A (en) 1970-07-08 1971-07-06 Method for closing bores at workpieces and improved plug constructions for the performance of the aforesaid method

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US3952395A (en) * 1974-12-30 1976-04-27 Goodyear Aerospace Corporation Method of closing the end of a drilled passage
EP0069866A1 (en) * 1981-06-15 1983-01-19 Heinrich Huth Closure device for bore holes
WO1985004235A1 (en) * 1984-03-09 1985-09-26 Expando Seal Tools, Inc. Leak resistant plug assembly
US4591068A (en) * 1983-02-15 1986-05-27 Westinghouse Electric Corp. Core barrel plug
US4867333A (en) * 1988-06-10 1989-09-19 The Lee Company High-pressure pin plug
EP0443720A2 (en) * 1990-02-22 1991-08-28 The Lee Company Tapered expansion sealing plug
US5061829A (en) * 1989-01-23 1991-10-29 Alusuisse-Lonza Services Ltd. Composite conductor rail of aluminum and steel, in particular high-performance railway conductor rail
US5078294A (en) * 1988-09-16 1992-01-07 Koenig Berbindungstechnik Ag Method for tight sealing and hole arrangement
US5295293A (en) * 1990-03-01 1994-03-22 Alfred Teves Gmbh Arrangement and method for closing off fluid passages
US5443097A (en) * 1990-03-01 1995-08-22 Alfred Teves Gmbh Arrangement for closing off fluid passages
US5779085A (en) * 1997-03-11 1998-07-14 Gas Research Institute Expandable pin plug for automated use
US5848616A (en) * 1994-05-02 1998-12-15 Itt Automotive Europe Gmbh Closing device for closing pressure fluid conveying channels in a housing
US20020171286A1 (en) * 2001-04-25 2002-11-21 Unisia Jecs Corporation Brake fluid pressure control unit for vehicle
US6502344B1 (en) * 1999-11-27 2003-01-07 Blaser Jagdwaffen Gmbh Safety mechanism for preventing unauthorized use of a firearm
US20030091408A1 (en) * 2001-11-09 2003-05-15 Toosky Rahmatollah F. Nut plate
US6805024B1 (en) * 2001-10-09 2004-10-19 Valeo Electrical Systems, Inc. End play restriction wedge
US20050025606A1 (en) * 2001-11-09 2005-02-03 Toosky Rahmatollah F. Push-type rivetless nut plate and method and apparatus for installing same
US20050072702A1 (en) * 2003-10-07 2005-04-07 Bobby Hu Tool receiving device
US20050253449A1 (en) * 2001-04-25 2005-11-17 Hitachi Ltd. Brake liquid pressure control unit of on-vehicle device and its manufacturing method
US20060219401A1 (en) * 2005-03-31 2006-10-05 Schlumberger Technology Corporation Apparatus and method for sensing downhole parameters
US20080101888A1 (en) * 2006-11-01 2008-05-01 Toosky Rahmatollah F Nut plate fastener assembly for hard metal materials
US20090065082A1 (en) * 2007-09-10 2009-03-12 Marco Systemanalyse Und Entwicklung Gmbh Closure plug
US7631664B1 (en) * 2008-09-04 2009-12-15 Tejas Research And Engineering, Lp Threaded expansion plugs
US20100319800A1 (en) * 2009-06-23 2010-12-23 Advics Co., Ltd. Plug structure
JP2012517926A (en) * 2009-02-16 2012-08-09 フォード グローバル テクノロジーズ、リミテッド ライアビリティ カンパニー Improved press-fit connection of rack housing
US20140227059A1 (en) * 2011-06-28 2014-08-14 Valeo Systémes d'Essuyage Permanent screw attachment
US20140352128A1 (en) * 2013-05-28 2014-12-04 Miba Sinter Austria Gmbh Method of closing a bore
US20150114983A1 (en) * 2013-10-30 2015-04-30 Dassault Aviation Device and method for plugging an end of a conduit
US20160069370A1 (en) * 2014-09-05 2016-03-10 Hubei Boshilong Technology Co.,Ltd. Closed rivet plug
CN105864429A (en) * 2016-05-30 2016-08-17 浙江万里扬股份有限公司 Sealing plug and sealing structure of workpiece
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US20170205017A1 (en) * 2014-07-18 2017-07-20 Sfc Koenig Ag Closure Element
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952395A (en) * 1974-12-30 1976-04-27 Goodyear Aerospace Corporation Method of closing the end of a drilled passage
EP0069866A1 (en) * 1981-06-15 1983-01-19 Heinrich Huth Closure device for bore holes
US4591068A (en) * 1983-02-15 1986-05-27 Westinghouse Electric Corp. Core barrel plug
WO1985004235A1 (en) * 1984-03-09 1985-09-26 Expando Seal Tools, Inc. Leak resistant plug assembly
US4867333A (en) * 1988-06-10 1989-09-19 The Lee Company High-pressure pin plug
US5078294A (en) * 1988-09-16 1992-01-07 Koenig Berbindungstechnik Ag Method for tight sealing and hole arrangement
US5061829A (en) * 1989-01-23 1991-10-29 Alusuisse-Lonza Services Ltd. Composite conductor rail of aluminum and steel, in particular high-performance railway conductor rail
EP0443720A3 (en) * 1990-02-22 1992-02-19 The Lee Company Tapered expansion sealing plug
US5160226A (en) * 1990-02-22 1992-11-03 The Lee Company Tapered expansion sealing plug
EP0443720A2 (en) * 1990-02-22 1991-08-28 The Lee Company Tapered expansion sealing plug
US5295293A (en) * 1990-03-01 1994-03-22 Alfred Teves Gmbh Arrangement and method for closing off fluid passages
US5443097A (en) * 1990-03-01 1995-08-22 Alfred Teves Gmbh Arrangement for closing off fluid passages
US5848616A (en) * 1994-05-02 1998-12-15 Itt Automotive Europe Gmbh Closing device for closing pressure fluid conveying channels in a housing
US5779085A (en) * 1997-03-11 1998-07-14 Gas Research Institute Expandable pin plug for automated use
EP0864799A2 (en) * 1997-03-11 1998-09-16 Schlumberger Limited Expandable pin plug
EP0864799A3 (en) * 1997-03-11 2000-02-23 Schlumberger Limited Expandable pin plug
US6502344B1 (en) * 1999-11-27 2003-01-07 Blaser Jagdwaffen Gmbh Safety mechanism for preventing unauthorized use of a firearm
US20070251081A1 (en) * 2001-04-25 2007-11-01 Hitachi, Ltd. Brake liquid pressure control unit of on- vehicle device and its manufacturing method
US20050253449A1 (en) * 2001-04-25 2005-11-17 Hitachi Ltd. Brake liquid pressure control unit of on-vehicle device and its manufacturing method
US20020171286A1 (en) * 2001-04-25 2002-11-21 Unisia Jecs Corporation Brake fluid pressure control unit for vehicle
US7249808B2 (en) * 2001-04-25 2007-07-31 Hitachi Unisia Automotive, Ltd. Brake liquid pressure control unit of on-vehicle device and its manufacturing method
US7427114B2 (en) 2001-04-25 2008-09-23 Hitachi, Ltd. Brake fluid pressure control unit for vehicle
US6805024B1 (en) * 2001-10-09 2004-10-19 Valeo Electrical Systems, Inc. End play restriction wedge
US7114900B2 (en) * 2001-11-09 2006-10-03 Textron Inc. Push-type rivetless nut plate and method and apparatus for installing same
US7059816B2 (en) 2001-11-09 2006-06-13 Textron Inc. Nut plate
US20050117994A1 (en) * 2001-11-09 2005-06-02 Toosky Rahmatollah F. Method of securing a nut plate to a wall defined by an aperture through a workpiece
US20060283003A1 (en) * 2001-11-09 2006-12-21 Toosky Rahmatollah F Push-type rivetless nut plate and method and apparatus for installing same
US7237314B2 (en) 2001-11-09 2007-07-03 Sps Technologies, Llc Method of securing a nut plate to a wall defined by an aperture through a workpiece
US20050025606A1 (en) * 2001-11-09 2005-02-03 Toosky Rahmatollah F. Push-type rivetless nut plate and method and apparatus for installing same
US20030091408A1 (en) * 2001-11-09 2003-05-15 Toosky Rahmatollah F. Nut plate
US7698798B2 (en) 2001-11-09 2010-04-20 Sps Technologies, Llc Push-type rivetless nut plate and method and apparatus for installing same
US20050072702A1 (en) * 2003-10-07 2005-04-07 Bobby Hu Tool receiving device
WO2006025844A2 (en) * 2004-08-30 2006-03-09 Textron Inc. Push-type rivetless nut plate
WO2006025844A3 (en) * 2004-08-30 2007-02-08 Textron Inc Push-type rivetless nut plate
US20060219401A1 (en) * 2005-03-31 2006-10-05 Schlumberger Technology Corporation Apparatus and method for sensing downhole parameters
US7278480B2 (en) 2005-03-31 2007-10-09 Schlumberger Technology Corporation Apparatus and method for sensing downhole parameters
US7802952B2 (en) 2006-11-01 2010-09-28 Sps Technologies, Llc Nut plate fastener assembly for hard metal materials
US7575404B2 (en) 2006-11-01 2009-08-18 Sps Technologies, Llc Nut plate fastener assembly for composite materials
US20080101887A1 (en) * 2006-11-01 2008-05-01 Sps Technologies, Llc Nut plate fastener assembly for composite materials
US20080101888A1 (en) * 2006-11-01 2008-05-01 Toosky Rahmatollah F Nut plate fastener assembly for hard metal materials
US20090065082A1 (en) * 2007-09-10 2009-03-12 Marco Systemanalyse Und Entwicklung Gmbh Closure plug
US7588052B2 (en) * 2007-09-10 2009-09-15 Marco Systemanalyse Und Entwicklung Gmbh Closure plug
US7631664B1 (en) * 2008-09-04 2009-12-15 Tejas Research And Engineering, Lp Threaded expansion plugs
JP2012517926A (en) * 2009-02-16 2012-08-09 フォード グローバル テクノロジーズ、リミテッド ライアビリティ カンパニー Improved press-fit connection of rack housing
US8171961B2 (en) * 2009-06-23 2012-05-08 Advics Co., Ltd. Plug structure
US20100319800A1 (en) * 2009-06-23 2010-12-23 Advics Co., Ltd. Plug structure
US20140227059A1 (en) * 2011-06-28 2014-08-14 Valeo Systémes d'Essuyage Permanent screw attachment
US20140352128A1 (en) * 2013-05-28 2014-12-04 Miba Sinter Austria Gmbh Method of closing a bore
US9539641B2 (en) * 2013-05-28 2017-01-10 Miba Sinter Austria Gmbh Method of closing a bore
US20150114983A1 (en) * 2013-10-30 2015-04-30 Dassault Aviation Device and method for plugging an end of a conduit
US9416907B2 (en) * 2013-10-30 2016-08-16 Dassault Aviation Device and method for plugging an end of a conduit
US10030802B2 (en) * 2014-07-18 2018-07-24 Sfc Koenig Ag Closure element
US20170205017A1 (en) * 2014-07-18 2017-07-20 Sfc Koenig Ag Closure Element
US20160069370A1 (en) * 2014-09-05 2016-03-10 Hubei Boshilong Technology Co.,Ltd. Closed rivet plug
US9541115B2 (en) * 2014-09-05 2017-01-10 Hubei Boshilong Technology Co., Ltd. Closed rivet plug
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US20190128465A1 (en) * 2017-10-28 2019-05-02 Hamilton Sundstrand Corporation Hydraulic plugs
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US20190375564A1 (en) * 2018-06-07 2019-12-12 G&H Diversified Manufacturing Lp Thread protector for tubular members
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