US2770998A - Tamper-proof screw having frusto-conical head with flat tool engaging facets thereon - Google Patents
Tamper-proof screw having frusto-conical head with flat tool engaging facets thereon Download PDFInfo
- Publication number
- US2770998A US2770998A US475372A US47537254A US2770998A US 2770998 A US2770998 A US 2770998A US 475372 A US475372 A US 475372A US 47537254 A US47537254 A US 47537254A US 2770998 A US2770998 A US 2770998A
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- United States
- Prior art keywords
- screw
- head
- facets
- tamper
- frusto
- 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
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000005553 drilling Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
- F16B23/0061—Specially shaped nuts or heads of bolts or screws for rotations by a tool with grooves, notches or splines on the external peripheral surface designed for tools engaging in radial direction
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
- F16B23/0007—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
- Y10S411/91—Antitamper means
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
- Y10S411/919—Screw having driving contacts
Definitions
- FIG. 3. P ⁇ TM M FIG. 5.
- FIG 6 FIG. 8.
- screws In many applications where screws are used it is necessary that they be so constructed as to be secure against theft, tampering, and similar mischief. Such screws are used extensively in vending machines, parking meters, coin controlled turnstiles, lockers, game devices and so on. While it is permissible that the tamper-proof screws be installed or removed by a specially shaped wrench keyed to the shape of the screw heads, it is necessary to provide that the screws can not be loosened by a conventional screwdriver or knife, a parallel jawed wrench such as an open end or hexagonal wrench, or by a conventional wrench or screwdriver of any type. It is desirable that the screw heads be symmetrical in shape and ornamental in appearance.
- the principal object of the invention is therefore directed to providing a screw with a head of novel shape which can be effectively gripped only by a correspondingly shaped wrench and which cannot be turned by any conventional screwdriver or wrench.
- Fig. 1 is a top plan view of a screw embodying the invention.
- Fig. 2 is an elevational view of the screw of Fig. 1 taken on lines 2-2 of Fig. 1.
- Fig. 3 is a sectional view taken on lines 33 of Fig. 1.
- Fig. 4 is a top plan view of a modification of the invention.
- Fig. 5 is an elevational view of the modification of Fig. 4.
- Fig. 6 is a top plan view of another modification of the invention.
- Fig. 7 is an elevational view of the modification of Fig. 6.
- Fig. 8 is a sectional view taken on lines 88 of Fig. 6.
- a screw having a solid shank 10 and a solid head 12.
- the head is in the form of a conical frustum, that is, it is in the form of a truncated cone with a flat top 13 and a flat bottom integral with shank 10.
- the conical side of the head of the screw is disposed at an angle of approximately 55 degrees to the base of the head, as clearly illustrated in the drawing.
- Three facets 14 are formed on the head 12. Each facet 14 extends from the bottom surface 15 of the head part way up the tapered side 19 leaving a major portion of the surface 15 perfectly smooth and unbroken.
- the facet 14 may be disposed parallel to the axis 0 of shank 10 or slightly inclined thereto as shown by dotted line A.
- the facet 14 is substantially flat, as if a true conic section had been cut from the head 12 leaving surface 14 with a parabolic side 20 terminating at the bottom surface 15. None of the three facets 14 are parallel to each other and they may be uniformly or non-uniformly spaced around the head. In the structure of the head it will be noted that there are no parallel surfaces which can be gripped by any conventional type of wrench. If the screw is inserted in a suitably threaded hole and tightened by a special wrench having a recess with sides mating with the facets 14, said surface 15 bears on surface S of a support, no conventional wrench can be used to loosen the screw and even hammer blows directed on the facets 14 will be ineffective to loosen the screw. The screw is hardened by heat treating and it cannot, therefore, be removed by drilling it out or filing additional facets thereon to receive a conventional wrench or by any other method.
- the three facets 14 are rather concave.
- One portion 14A of the facet 14' is substantially straight and the remaining portion is curved.
- Curved portion 14B is at the leading side and portion 14A is at the following side of each facet 14 for a screw tightened in conventional manner by rotation clockwise as shown by arrow T.
- no exposed surface of the head is disposed parallel to any other.
- the screw is tamperproof because a hammer blow directed to the head on line 17 at curved portion 14B will serve to tighten the screw rather than loosen it; a blow directed on line 18 to straight portion 14A will be ineffective since the line of force will pass within the area of shank 10. A blow in any other direction as on line 16 will glance off the straight portion 14A. No parallel jawed wrench can loosen the screw. If the screw is made with a left hand thread to be tightened by counter-clockwise rotation, the direction of placement of 'facets 14 will be reversed with curved portion 14B leading and portion 14A following in the counter-clockwise direction.
- the head 12 has three scoop-shaped facets or recesses 14".
- the surface 21 of each recess is rather concave and smooth with its lower edge 21' somewhat inclined to the plane of the bottom surface 15. This embodiment is common with those above described and affords no purchase for effective application of any conventional wrench, screwdriver, or hammer to loosen the screw once it is secured in place.
- a substantially tamper-proof screw comprising a solid threaded shank with a solid conical head integrally formed thereon, said head being generally in the form of a frustum of a cone with a flat top and a flat base, said threaded shank projecting axially from said base, and three nonparallel flat facets formed on said conical side of the head immediately adjacent said base in equally spaced relation to each other and occupying a relatively small portion of the height of the head, said facets being disposed on planes which are parallel to the longitudinal axis of said threaded shank, said facets merging throughout their entire length with the conical side of the head of the screw, said conical side of the head of the screw being disposed at an angle of approximately 55 degrees to the base of the head.
Description
Nov. 20, 1956 R. F. SCHWARTZ 2,
DAMPER-PROOF scREw HAVING FRUS'IO-CONICAL HEAD WITH FLAT T OOL ENGAG FA S THEREON Filed Dec. l9
FIG. 3. P {TM M FIG. 5.
FIG 6 FIG. 8.
A AA
- INVENTOR E/zr F cn wnkrz ATTORNEY.
United States Patent TAMPER-PROOF SCREW HAVING FRUSTO-CONI- CAL HEAD WITH FLAT TOOL ENGAGING FACETS THEREON Robert F. Schwartz, New York, N. Y.
Application December 15, 1954, Serial No. 475,372
1 Claim. (Cl. 85-45) This invention concerns a novel screw provided with a head shaped in such a manner as to render the screw tamper-proof.
In many applications where screws are used it is necessary that they be so constructed as to be secure against theft, tampering, and similar mischief. Such screws are used extensively in vending machines, parking meters, coin controlled turnstiles, lockers, game devices and so on. While it is permissible that the tamper-proof screws be installed or removed by a specially shaped wrench keyed to the shape of the screw heads, it is necessary to provide that the screws can not be loosened by a conventional screwdriver or knife, a parallel jawed wrench such as an open end or hexagonal wrench, or by a conventional wrench or screwdriver of any type. It is desirable that the screw heads be symmetrical in shape and ornamental in appearance.
The principal object of the invention is therefore directed to providing a screw with a head of novel shape which can be effectively gripped only by a correspondingly shaped wrench and which cannot be turned by any conventional screwdriver or wrench.
It is a further object of the invention to provide a screw having a generally conical head with a plurality of facets spaced around the head.
Other and further objects and advantages of the invention will become apparent from the following description taken together with the drawings, wherein:
Fig. 1 is a top plan view of a screw embodying the invention.
Fig. 2 is an elevational view of the screw of Fig. 1 taken on lines 2-2 of Fig. 1.
Fig. 3 is a sectional view taken on lines 33 of Fig. 1.
Fig. 4 is a top plan view of a modification of the invention.
Fig. 5 is an elevational view of the modification of Fig. 4.
Fig. 6 is a top plan view of another modification of the invention.
Fig. 7 is an elevational view of the modification of Fig. 6.
Fig. 8 is a sectional view taken on lines 88 of Fig. 6.
In Figs. 1, 2 and 3 are shown a screw having a solid shank 10 and a solid head 12. The head is in the form of a conical frustum, that is, it is in the form of a truncated cone with a flat top 13 and a flat bottom integral with shank 10. The conical side of the head of the screw is disposed at an angle of approximately 55 degrees to the base of the head, as clearly illustrated in the drawing. Three facets 14 are formed on the head 12. Each facet 14 extends from the bottom surface 15 of the head part way up the tapered side 19 leaving a major portion of the surface 15 perfectly smooth and unbroken. The facet 14 may be disposed parallel to the axis 0 of shank 10 or slightly inclined thereto as shown by dotted line A. The facet 14 is substantially flat, as if a true conic section had been cut from the head 12 leaving surface 14 with a parabolic side 20 terminating at the bottom surface 15. None of the three facets 14 are parallel to each other and they may be uniformly or non-uniformly spaced around the head. In the structure of the head it will be noted that there are no parallel surfaces which can be gripped by any conventional type of wrench. If the screw is inserted in a suitably threaded hole and tightened by a special wrench having a recess with sides mating with the facets 14, said surface 15 bears on surface S of a support, no conventional wrench can be used to loosen the screw and even hammer blows directed on the facets 14 will be ineffective to loosen the screw. The screw is hardened by heat treating and it cannot, therefore, be removed by drilling it out or filing additional facets thereon to receive a conventional wrench or by any other method.
In the embodiment of Figs. 4 and 5, the three facets 14 are rather concave. One portion 14A of the facet 14' is substantially straight and the remaining portion is curved. Curved portion 14B is at the leading side and portion 14A is at the following side of each facet 14 for a screw tightened in conventional manner by rotation clockwise as shown by arrow T. In this embodiment when the screw is fully threaded and tightened in a threaded screwhole no exposed surface of the head is disposed parallel to any other. The screw is tamperproof because a hammer blow directed to the head on line 17 at curved portion 14B will serve to tighten the screw rather than loosen it; a blow directed on line 18 to straight portion 14A will be ineffective since the line of force will pass within the area of shank 10. A blow in any other direction as on line 16 will glance off the straight portion 14A. No parallel jawed wrench can loosen the screw. If the screw is made with a left hand thread to be tightened by counter-clockwise rotation, the direction of placement of 'facets 14 will be reversed with curved portion 14B leading and portion 14A following in the counter-clockwise direction.
In the embodiment shown in Figs. 6, 7, 8 the head 12 has three scoop-shaped facets or recesses 14". The surface 21 of each recess is rather concave and smooth with its lower edge 21' somewhat inclined to the plane of the bottom surface 15. This embodiment is common with those above described and affords no purchase for effective application of any conventional wrench, screwdriver, or hammer to loosen the screw once it is secured in place.
There has thus been provided a screw having a head so shaped as to be secure againsts loosening by any casual tamperer so that it serves effectively as a tamper-proof element for a vending machine or the like. The ornamental appearance of the various forms of screw heads disclosed is apparent in the drawing.
Although a limited number of embodiments of the invention have been disclosed this has been done only by way of illustration. It will be apparent to those skilled in the art that changes are possible without departing from the spirit of the invention as defined by the scope of the appended claim.
What is claimed and desired to protect by Letters Patent of the United States is:
A substantially tamper-proof screw, comprising a solid threaded shank with a solid conical head integrally formed thereon, said head being generally in the form of a frustum of a cone with a flat top and a flat base, said threaded shank projecting axially from said base, and three nonparallel flat facets formed on said conical side of the head immediately adjacent said base in equally spaced relation to each other and occupying a relatively small portion of the height of the head, said facets being disposed on planes which are parallel to the longitudinal axis of said threaded shank, said facets merging throughout their entire length with the conical side of the head of the screw, said conical side of the head of the screw being disposed at an angle of approximately 55 degrees to the base of the head.
References Cited in the file of this patent UNITED STATES PATENTS Rodd Nov. 20, 1900 Smith Mar. 29, 1904 Rockstad Feb. 17, 1931 H'obler Feb. 20, 1934 Berg Nov. 5, 1940 McCallum May 30, 1950 FOREIGN PATENTS Germany June 29, 1953
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US475372A US2770998A (en) | 1954-12-15 | 1954-12-15 | Tamper-proof screw having frusto-conical head with flat tool engaging facets thereon |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US475372A US2770998A (en) | 1954-12-15 | 1954-12-15 | Tamper-proof screw having frusto-conical head with flat tool engaging facets thereon |
Publications (1)
Publication Number | Publication Date |
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US2770998A true US2770998A (en) | 1956-11-20 |
Family
ID=23887292
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US475372A Expired - Lifetime US2770998A (en) | 1954-12-15 | 1954-12-15 | Tamper-proof screw having frusto-conical head with flat tool engaging facets thereon |
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Cited By (39)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3295580A (en) * | 1964-07-06 | 1967-01-03 | Lamson & Sessions Co | Fastener having concave locking fins |
US3342236A (en) * | 1966-03-07 | 1967-09-19 | Isabel Place | Self-locking bolt |
US3382888A (en) * | 1963-12-07 | 1968-05-14 | Mueller Co | Tamper-proof plug and tool for fluid line |
US4171662A (en) * | 1976-12-20 | 1979-10-23 | Wright Line Inc. | Security screw |
US4237949A (en) * | 1978-10-05 | 1980-12-09 | Laurence Wagner | Anti-theft fastener |
US4258596A (en) * | 1978-01-18 | 1981-03-31 | Southco, Inc. | Tamper-resistant fastener |
USD270229S (en) | 1980-10-22 | 1983-08-23 | The Eastern Company | Tool and operator head for tool-operated lock |
USD270424S (en) | 1980-10-22 | 1983-09-06 | The Eastern Company | Tool operator for tool-operated locks |
FR2554186A1 (en) * | 1983-10-28 | 1985-05-03 | Intraviss | Means for mechanical assembly of the type using a screw or equivalent, with a driving recess opposing nonauthorised dismantling and corresponding drive member. |
US4537543A (en) * | 1983-07-11 | 1985-08-27 | Scott Tommy L | Security locking bolt |
US4827811A (en) * | 1987-12-11 | 1989-05-09 | Southco, Inc. | Tamper-resistant fastener and tool for operating same |
US4938108A (en) * | 1983-01-23 | 1990-07-03 | Abraham Levy | Theft-resistant fastener system |
US5378101A (en) * | 1992-12-22 | 1995-01-03 | Textron Inc. | Tamper-proof drive system based upon multi-lobular configuration |
US5957642A (en) * | 1996-06-14 | 1999-09-28 | Textron, Inc. | Cleat system |
USD420107S (en) * | 1999-01-29 | 2000-02-01 | Teknor Apex Company | Garden hose fitting |
US6341927B2 (en) * | 1999-07-23 | 2002-01-29 | Pinhead Components Inc. | Tamper reistant fastener |
US20050135898A1 (en) * | 2003-03-10 | 2005-06-23 | Jory Bell | Screw and screw driver |
US7021092B2 (en) | 2003-05-16 | 2006-04-04 | Stanton Concepts Inc. | Multiple function lock |
WO2007141717A1 (en) * | 2006-06-02 | 2007-12-13 | Pur Water Purification Products, Inc. | A nut for attaching two devices and method for providing the same |
US7424812B2 (en) | 2003-05-16 | 2008-09-16 | Stanton Concepts Inc. | Multiple function lock |
US7434426B2 (en) | 2003-05-16 | 2008-10-14 | Stanton Concepts Inc. | Multiple function lock |
US20090090661A1 (en) * | 2006-06-02 | 2009-04-09 | Pur Water Purification Products, Inc. | Apparatus and methods for faucet-mounted water filtration systems |
US7694542B2 (en) | 2004-07-22 | 2010-04-13 | Stanton Concepts Inc. | Tool operated combination lock |
US7712342B2 (en) | 2004-07-22 | 2010-05-11 | Stanton Concepts Inc. | Tool operated combination lock |
USD629487S1 (en) | 2008-04-17 | 2010-12-21 | The Procter & Gamble Company | Connector for a faucet mounted water filter |
USD629490S1 (en) | 2008-04-17 | 2010-12-21 | The Procter & Gamble Company | Connector for a faucet mounted water filter |
USD637693S1 (en) | 2010-08-18 | 2011-05-10 | The Procter & Gamble Company | Connector for a faucet mounted water filter |
USD637691S1 (en) | 2010-08-18 | 2011-05-10 | The Procter & Gamble Company | Connector for a faucet mounted water filter |
USD637690S1 (en) | 2010-08-18 | 2011-05-10 | The Procter & Gamble Company | Connector for a faucet mounted water filter |
US20110116895A1 (en) * | 2008-07-31 | 2011-05-19 | Michael Garver | Assembly improving, low mass, fastener head |
US20120047692A1 (en) * | 2010-08-28 | 2012-03-01 | Norma Germany Gmbh | Hose clamp with a clamping screw, clamping screw and tool for driving the clamping screw |
USD763641S1 (en) | 2015-06-04 | 2016-08-16 | Revlock, LLC | Wrench for a bicycle axle nut |
US9464660B2 (en) | 2014-06-10 | 2016-10-11 | Revlock, LLC | Tamper-resistant bicycle axle nut |
USD786138S1 (en) | 2015-06-04 | 2017-05-09 | Revlock, LLC | Bicycle axle nut |
EP3309412A1 (en) * | 2016-10-14 | 2018-04-18 | NovoNox KG | Safety screw for hygiene applications |
US20190085561A1 (en) * | 2017-09-19 | 2019-03-21 | Ono Kogyosyo Co., Ltd. | Reinforcement steel |
USD889407S1 (en) * | 2017-05-18 | 2020-07-07 | Gs Yuasa International Ltd. | Lead acid battery |
USD890097S1 (en) * | 2017-05-18 | 2020-07-14 | Gs Yuasa International Ltd. | Vent plug for lead acid battery |
US20220316519A1 (en) * | 2021-04-01 | 2022-10-06 | Iwata Bolt Kabushiki Kaisha | Security nut and security bolt |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US662134A (en) * | 1900-02-09 | 1900-11-20 | David A Mallo | Screw. |
US755804A (en) * | 1902-03-20 | 1904-03-29 | George Crocker Smith | Screw for metal, wood, &c., and means for operating same. |
US1792711A (en) * | 1929-04-03 | 1931-02-17 | Walmer L Rockstad | Demountable-rim-securing nut |
US1948110A (en) * | 1932-11-18 | 1934-02-20 | Frank C Hobler | Automobile spring shackle |
US2220389A (en) * | 1937-07-07 | 1940-11-05 | Berg Harold | Collimator |
US2509980A (en) * | 1948-06-23 | 1950-05-30 | Robert M Mccallum | Shoe cleat |
DE881129C (en) * | 1951-07-07 | 1953-06-29 | Norbert A Kreuz | Securing against unauthorized loosening of locking means, in particular screws, nuts or the like. |
-
1954
- 1954-12-15 US US475372A patent/US2770998A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US662134A (en) * | 1900-02-09 | 1900-11-20 | David A Mallo | Screw. |
US755804A (en) * | 1902-03-20 | 1904-03-29 | George Crocker Smith | Screw for metal, wood, &c., and means for operating same. |
US1792711A (en) * | 1929-04-03 | 1931-02-17 | Walmer L Rockstad | Demountable-rim-securing nut |
US1948110A (en) * | 1932-11-18 | 1934-02-20 | Frank C Hobler | Automobile spring shackle |
US2220389A (en) * | 1937-07-07 | 1940-11-05 | Berg Harold | Collimator |
US2509980A (en) * | 1948-06-23 | 1950-05-30 | Robert M Mccallum | Shoe cleat |
DE881129C (en) * | 1951-07-07 | 1953-06-29 | Norbert A Kreuz | Securing against unauthorized loosening of locking means, in particular screws, nuts or the like. |
Cited By (55)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3382888A (en) * | 1963-12-07 | 1968-05-14 | Mueller Co | Tamper-proof plug and tool for fluid line |
US3295580A (en) * | 1964-07-06 | 1967-01-03 | Lamson & Sessions Co | Fastener having concave locking fins |
US3342236A (en) * | 1966-03-07 | 1967-09-19 | Isabel Place | Self-locking bolt |
US4171662A (en) * | 1976-12-20 | 1979-10-23 | Wright Line Inc. | Security screw |
US4258596A (en) * | 1978-01-18 | 1981-03-31 | Southco, Inc. | Tamper-resistant fastener |
US4237949A (en) * | 1978-10-05 | 1980-12-09 | Laurence Wagner | Anti-theft fastener |
USD270229S (en) | 1980-10-22 | 1983-08-23 | The Eastern Company | Tool and operator head for tool-operated lock |
USD270424S (en) | 1980-10-22 | 1983-09-06 | The Eastern Company | Tool operator for tool-operated locks |
US4938108A (en) * | 1983-01-23 | 1990-07-03 | Abraham Levy | Theft-resistant fastener system |
US4537543A (en) * | 1983-07-11 | 1985-08-27 | Scott Tommy L | Security locking bolt |
FR2554186A1 (en) * | 1983-10-28 | 1985-05-03 | Intraviss | Means for mechanical assembly of the type using a screw or equivalent, with a driving recess opposing nonauthorised dismantling and corresponding drive member. |
US4827811A (en) * | 1987-12-11 | 1989-05-09 | Southco, Inc. | Tamper-resistant fastener and tool for operating same |
US5378101A (en) * | 1992-12-22 | 1995-01-03 | Textron Inc. | Tamper-proof drive system based upon multi-lobular configuration |
US5957642A (en) * | 1996-06-14 | 1999-09-28 | Textron, Inc. | Cleat system |
USD420107S (en) * | 1999-01-29 | 2000-02-01 | Teknor Apex Company | Garden hose fitting |
US6341927B2 (en) * | 1999-07-23 | 2002-01-29 | Pinhead Components Inc. | Tamper reistant fastener |
US20050135898A1 (en) * | 2003-03-10 | 2005-06-23 | Jory Bell | Screw and screw driver |
US7934406B2 (en) | 2003-05-16 | 2011-05-03 | Stanton Concepts Inc. | Multiple function lock |
US7021092B2 (en) | 2003-05-16 | 2006-04-04 | Stanton Concepts Inc. | Multiple function lock |
US7913526B2 (en) | 2003-05-16 | 2011-03-29 | Stanton Concepts Inc. | Multiple function lock |
US7424812B2 (en) | 2003-05-16 | 2008-09-16 | Stanton Concepts Inc. | Multiple function lock |
US7434426B2 (en) | 2003-05-16 | 2008-10-14 | Stanton Concepts Inc. | Multiple function lock |
US8047027B2 (en) | 2003-05-16 | 2011-11-01 | Stanton Concepts, L.L.C. | Multiple function lock |
US7712342B2 (en) | 2004-07-22 | 2010-05-11 | Stanton Concepts Inc. | Tool operated combination lock |
US7694542B2 (en) | 2004-07-22 | 2010-04-13 | Stanton Concepts Inc. | Tool operated combination lock |
US7568874B2 (en) | 2006-06-02 | 2009-08-04 | Pur Water Purification Products, Inc. | Nut for attaching two devices and method for providing the same |
WO2007141717A1 (en) * | 2006-06-02 | 2007-12-13 | Pur Water Purification Products, Inc. | A nut for attaching two devices and method for providing the same |
US10125026B2 (en) | 2006-06-02 | 2018-11-13 | Helen Of Troy Limited | Apparatus and methods for faucet-mounted water filtration systems |
US9004290B2 (en) | 2006-06-02 | 2015-04-14 | Pur Water Purification Products, Inc. | Apparatus and methods for faucet-mounted water filtration systems |
US20090090661A1 (en) * | 2006-06-02 | 2009-04-09 | Pur Water Purification Products, Inc. | Apparatus and methods for faucet-mounted water filtration systems |
US20070292237A1 (en) * | 2006-06-02 | 2007-12-20 | Richard Paul Riedel | Nut for attaching two devices and method for providing the same |
US11440813B2 (en) | 2007-09-05 | 2022-09-13 | Helen Of Troy Limited | Apparatus and methods for faucet-mounted water filtration systems |
USD629487S1 (en) | 2008-04-17 | 2010-12-21 | The Procter & Gamble Company | Connector for a faucet mounted water filter |
USD637692S1 (en) | 2008-04-17 | 2011-05-10 | The Procter & Gamble Company | Connector for a faucet mounted water filter |
USD631130S1 (en) | 2008-04-17 | 2011-01-18 | The Procter & Gamble Company | Connector for a faucet mounted water filter |
USD629490S1 (en) | 2008-04-17 | 2010-12-21 | The Procter & Gamble Company | Connector for a faucet mounted water filter |
USD665048S1 (en) | 2008-04-17 | 2012-08-07 | Pur Water Purification Products, Inc. | Connector for a faucet mounted water filter |
USD629865S1 (en) | 2008-04-17 | 2010-12-28 | The Procter & Gambple Company | Connector for a faucet mounted water filter |
USD629489S1 (en) | 2008-04-17 | 2010-12-21 | The Procter & Gamble Company | Connector for a faucet mounted water filter |
US9644660B2 (en) | 2008-07-31 | 2017-05-09 | Mathread Inc. | Assembly improving, low mass, fastener head |
US20110116895A1 (en) * | 2008-07-31 | 2011-05-19 | Michael Garver | Assembly improving, low mass, fastener head |
US8747044B2 (en) * | 2008-07-31 | 2014-06-10 | Mathread Inc. | Assembly improving, low mass, fastener head |
USD637691S1 (en) | 2010-08-18 | 2011-05-10 | The Procter & Gamble Company | Connector for a faucet mounted water filter |
USD637690S1 (en) | 2010-08-18 | 2011-05-10 | The Procter & Gamble Company | Connector for a faucet mounted water filter |
USD637693S1 (en) | 2010-08-18 | 2011-05-10 | The Procter & Gamble Company | Connector for a faucet mounted water filter |
US9377142B2 (en) * | 2010-08-28 | 2016-06-28 | Norma Germany Gmbh | Hose clamp with a clamping screw, clamping screw and tool for driving the clamping screw |
US20120047692A1 (en) * | 2010-08-28 | 2012-03-01 | Norma Germany Gmbh | Hose clamp with a clamping screw, clamping screw and tool for driving the clamping screw |
US9464660B2 (en) | 2014-06-10 | 2016-10-11 | Revlock, LLC | Tamper-resistant bicycle axle nut |
USD786138S1 (en) | 2015-06-04 | 2017-05-09 | Revlock, LLC | Bicycle axle nut |
USD763641S1 (en) | 2015-06-04 | 2016-08-16 | Revlock, LLC | Wrench for a bicycle axle nut |
EP3309412A1 (en) * | 2016-10-14 | 2018-04-18 | NovoNox KG | Safety screw for hygiene applications |
USD889407S1 (en) * | 2017-05-18 | 2020-07-07 | Gs Yuasa International Ltd. | Lead acid battery |
USD890097S1 (en) * | 2017-05-18 | 2020-07-14 | Gs Yuasa International Ltd. | Vent plug for lead acid battery |
US20190085561A1 (en) * | 2017-09-19 | 2019-03-21 | Ono Kogyosyo Co., Ltd. | Reinforcement steel |
US20220316519A1 (en) * | 2021-04-01 | 2022-10-06 | Iwata Bolt Kabushiki Kaisha | Security nut and security bolt |
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