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Publication numberUS3578200 A
Publication typeGrant
Publication dateMay 11, 1971
Filing dateNov 3, 1969
Priority dateNov 3, 1969
Publication numberUS 3578200 A, US 3578200A, US-A-3578200, US3578200 A, US3578200A
InventorsHarry Hetzer
Original AssigneeGti Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Port protectors
US 3578200 A
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Description  (OCR text may contain errors)

United States Patent [72] Inventor Harry Hetzer Depew, N.Y. 873,584

Nov. 3, 1969 May 11, 1971 GT] Corporation Meadville, Pa.

[21 Appl. No. [22] Filed [45] Patented [73] Assignee [54] PORT PROTECTORS 5 Claims, 5 Drawing Figs.

Pn'mary Examiner-George E. Lowrance AttorneyBuell, Blenko & Ziesenheim ABSTRACT: A port closure is provided for threaded ports comprising a resilient cylindrical member adapted to slidably fit within said port and having an interrupted thread on the exterior thereof intermediate the ends engaging the threads in said port, a circular end cap covering one end of said cylindrical member and extending beyond the periphery forming an annular radial flange, a depending ring at the outer periphery of the flange spaced from the cylinder and engaging the surface surrounding the port and spacing the flange therefrom when the cylinder is in place in said port whereby the cylinder is under axial tension between the thread and end cap.

, Patented Mg 11, 19 71 INVENTOR.

BY HARRY HETZE R w h ORNEY 1 PORT PROTECTORS This invention relates to port protectors and particularly to a simple inexpensive protector or closure for threaded ports such as are found in valve bodies, hydraulic brake cylinders, air brake cylinders and actuators and like apparatus.

The problem of protecting the threads and entry surface of a threaded port is one of long standing and many different protectors have been heretofore proposed. Such protectors have been made of plastics, metals and the like. Generally these closures are either too diflicult to install and remove or are too easily dislodged as well as being less satisfactory in various other ways. 1 a

The present invention provides a port protector which is easily installed, will not come out accidentally and yet is quickly removed when desired. It not only protects the threads within the port but also the surface surrounding the entrance to the port.

Preferably I provide a closure. or protector for internal threads within a port which comprises a resilient cylindrical memberadapted to slidably fit within said port, an interrupted thread on the exterior of the cylindrical member engaging the threads of said port, a circular end cap closing one end of said cylindrical member and extending beyond the periphery of the cylindrical member forming an annular flange surrounding the end of said cylinder having a depending annular ring at its outer periphery engaging the surface surrounding the port and spacing'the flange from said surface. When the closure of this invention is inserted into a port, it is forced inwardly on the end cap so as to provide a cantilever stress on the cylinder so that it is under tension, pulling the interrupted thread into tight engagement with the thread in the port. This stress provides a holding action against the threads which prevents the closure from being removed until the stress is relieved. This is accomplished by piercing the center of the cap which releases the cantilever action and the closure is readily removed. Preferably the closure is molded in one piece from a resilient plastic. such as polyethylene.

- The interrupted thread requires very little force to insert the closure in the port and no turning or spinning is required. This a is a great time saving over threaded'and tapered plugs of the prior art.

The tension of the closure when properly inserted provides a seal at the outer edge of the flange at the depending ring which acts as an effective mask against intrusion of paints, solvents, dirt and foreign material either into the port or on the surface immediately surrounding the port, which may be necessarily clean and free from scratches for use in sealing a I fitting in the port.

In the foregoing specification l have set out certain objects, purposes and advantages of my invention. Other objects, purposes and advantages will be apparent from a consideration of the following description and the accompanying drawings in which:

FIG. 1 is a side elevation of a closure according to my invention;

FIG. 2 is a section on the line ll-ll of FIG. 1;

FIG. 3 is a bottom plan view of the closure of FIG. 1;

FIG. 4 is a top plan view of the closure of FIG. 1; and

FIG. 5 is a fragmentary section through a port with the closure installed.

Referring to the drawings 1 have illustrated a closure having a cylindrical body of resilient plastic material provided with interrupted threads 11 intermediate'its ends. An end cap 12 of resilient plastic is integrally formed with cylinder 10 and extends beyond the cylinder to form an annular flange 13 having a depending ring 14 at its outer extremity. An upstanding ring 15 may be formedon the top surface of the cap and the area within ring 15 may be reduced in thickness as indicated by the dotted line 17. i

The closure is inserted into a 'port by simply forcing the cylinder into the port until ring 14 bears on surface 21 surrounding port 20 with the interrupted threads 11 engaged within the threads 22 in port 20 and the end cap slightly dished. This places the cylinder 10 under pressure from the dished end cap exerting a cantilever force from ring 14. At this position the closure is very difficult to remove. However, if the area within ring 15 is pierced as by a screwdriver, the pressure is relieved and the closure is easily removed. While not necessary, it is possible to make the area within ring 15 of reduced thickness for ease of puncturing.

While l have illustrated and described a presently preferred embodiment of my invention in the foregoing specification, it will be understood that the invention may be otherwise embodied within the scope of the following claims.

I claim:

1. A closure for internally threaded ports comprising a resilient cylindrical member adapted to slidably fit within said port, an interrupted thread on the exterior of the cylindrical member engaging the threads in said port, a circular end cap closing one end of said cylindrical member and extending beyond the periphery thereof forming an annular flange, a depending ring at the outer periphery of said flange spaced from the cylinder member and engaging the surface surrounding the port and spacing the flange therefrom when the cylinder member is in place in said port whereby the cylinder member is in axial tension.

2. A closure as claimed in claim ll wherein the center portion of said circular end cap is reduced in thickness.

3. A closure as claimed in claim 1 made of polyethylene.

4. A closure as claimed in claim 1 formed in one piece of a resilient plastic.

5. A closure as claimed in claim 1 wherein the interrupted thread comprises two thread segments substantially apart.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2277713 *Sep 8, 1939Mar 31, 1942Arthur L ParkerThread protector
US2632479 *Mar 8, 1949Mar 24, 1953Aluminum Co Of AmericaThread protector
US2663451 *Oct 10, 1951Dec 22, 1953Yarnall Chandler PClosure plug
US2679878 *Jan 27, 1949Jun 1, 1954Nesco IncProcessed rubber material and rubber like material garbage container
US2826222 *Oct 29, 1954Mar 11, 1958James W CasePreservative closure
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3661291 *Aug 24, 1970May 9, 1972Gti CorpFasteners and closures
US4020874 *Sep 5, 1975May 3, 1977Precise Metals & Plastic, Inc.Thermoplastic thread protector for internally threaded pipe
US4373465 *Oct 3, 1980Feb 15, 1983The Bendix CorporationVisual fluid level indicator
US4620641 *Dec 12, 1985Nov 4, 1986General Motors CorporationAccess plug for threaded holes in electric starting apparatus
US4796668 *Jan 7, 1984Jan 10, 1989VallourecDevice for protecting threadings and butt-type joint bearing surfaces of metallic tubes
US4875817 *Jul 7, 1987Oct 24, 1989Toyota Jidosha Kabushiki KaishaSealed weld nut
US4963062 *Feb 2, 1989Oct 16, 1990Giannuzzi LouisSingle-piece, pre-shaped anchor
US5118003 *Nov 9, 1990Jun 2, 1992Bemis Manufacturing CompanyVacuum drainage collecting device
US5145570 *Dec 27, 1990Sep 8, 1992Sukrija JusufbegovicPlug to seal recesses for anode rods in anode blocks during calcination process
US5311776 *Apr 12, 1993May 17, 1994Rochester Gauges, Inc.Pre-installation liquid level gauge assembly with thread protector
US7140826Oct 30, 2002Nov 28, 2006Powers Fasteners, Inc.Shaped anchor
US7762282 *May 23, 2005Jul 27, 2010Gabe CoscarellaClosure for a plumbing cleanout
DE2938263A1 *Sep 21, 1979Apr 2, 1981Lancier Masch PeterVerschlusspfropfen
DE3106543A1 *Feb 21, 1981Sep 9, 1982Kienzle Apparate GmbhAnordnung zum verschliessen und plombieren einer in einem bauteil befindlichen oeffnung
DE9111402U1 *Sep 13, 1991Dec 5, 1991Guske & Rautenberg Gmbh, 5253 Lindlar, DeTitle not available
EP0193508A1 *Feb 20, 1986Sep 3, 1986FJELD & HALVORSEN A/SBattery cap
Classifications
U.S. Classification220/787, 138/96.00T, 473/566, 411/910
International ClassificationB65D39/00
Cooperative ClassificationB65D2539/003, B65D39/0023, Y10S411/91
European ClassificationB65D39/00F3
Legal Events
DateCodeEventDescription
Feb 21, 1986AS06Security interest
Owner name: MARINE MIDLAND BANK, N.A., ONE MARINE MIDLAND CENT
Owner name: PROTECTIVE CLOSURES CO., INC.
Effective date: 19860214
Feb 21, 1986ASAssignment
Owner name: MARINE MIDLAND BANK, N.A., ONE MARINE MIDLAND CENT
Free format text: SECURITY INTEREST;ASSIGNOR:PROTECTIVE CLOSURES CO., INC.;REEL/FRAME:004522/0129
Effective date: 19860214