Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS791548 A
Publication typeGrant
Publication dateJun 6, 1905
Filing dateMay 23, 1903
Priority dateMay 23, 1903
Publication numberUS 791548 A, US 791548A, US-A-791548, US791548 A, US791548A
InventorsMax H Fischer
Original AssigneeHollow Screw Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 791548 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

- UNITED* SIATESA financed June o, 1905.




SPECIFICATION forming part of Letters Patent No. 791,548, dated June 6, 1905.

Application led Hay 23, 1908. Serial No. 158,437- I To all whom it may concern:

Be it known that I, MAx H. FISCHER, of East Orange, in the county of Essex and State of New Jersey, have invented certain new and useful Improvementsl in Set-Screws; and I do hereby declare the following to be a full, clear, and exact description of the same,

reference being had to the accompanying drawings, forming a part of this specification, and to the reference-numerals marked thereon.

My present invention relates to improvements in set-screws, and has for its object to provide an article that can be readily and cheaply manufactured, but which will obviate many of the diiiculties of manipulation that have characterized the use of former devices. The ordinary set-screw formed by cutting threads upon the outer surface of solid cylinders of metal and providing One end thereof witha shallow slot or recess. for the key or other instrument by means of which it is adjusted has been found to have as its chief objection a tendency to become jammed either from rust, mutilation, orthe lodgment of foreign substances inthe tapping, and the means provided have proved inadequate to effect its immediate removal. Furthermore, when once f broken or crushed yin its adjusted position it has required a large expenditure of time and labor to extricate the fragments. Therefore I have' devised an article which effectually eliminates these difficulties, as the force exerted to cause its removal is directly applied throughout its whole length, which equalizes the strain anddissipates any tendency it may` have to twist or break; and my device is further designed to provide a simple and 4convenient. method of locking the screw in its ad-v justed position by using it in conjunction with another in such a manner that both maybe easily released witlfout necessitating the separate removal of either.

1n the drawings, Figure 1 is a'perspective view of the screw. Fig. 2 is a cross-sectional lview of' a shaft and hub to which the screw is applied`with the latter in process of -adjustd ment, and Fig. 3 is a similar view showingthe method of Operating the locking connection.

Similar reference-numerals in the three figures indicate similar parts.

The device consists, essentially, of a hollow engaging screw 1, closed at one end and provided with an aperture 2, which Ihave shown hexagonal in shape to conform as near as possible with the contour of the piece without weakening it, though it may be of any anguwrench inserted therein. The closed end is beveledat 3 and provided with either a convex or concave face 4, accordingly as adapted to engage a flat or rounded surface. The locking member 5 is similarly constructed, but is 0pen\at both ends and has the aperture extending throughout its entire length. The inner end of the locking member and the outer end of the nut are each provided with the attened faces, as shown, so that as the former is forced into engagement with the latter there will be considerable frictional engagement between the abutting faces, which will serve to hold both the nut and the locking member in position. v v

The method of using the device is as follows: The locking member is slipped upon the shank of a mandrel or key 6,` similar in crosssection` to its interior and adapted to engage therewith, and the latter isthen inserted in the aperture in the member'l, when both are driven together until the latter forms a/bite with the surface-to be engaged. The key is then partially withdrawn, as shown in Fig. 3, until it engages with the locking membe/Il only, when the latter is independently driven into firm contact with theupper surface of the engaging member, securing it in its position. In releasing the connection/the locking member is first started until the keyshank is permitted to operate in the aperture in the engaging member, when vboth may be withdrawn either totally or partially. I

It will be understood that I- do not limit my.

lar or irregular form that will not admit ofL n the free rotation of ay similarly-shaped key or self to a set-screw of two-parts only, as any number may be used in series and locked suc-- A set-screw composed of two exteriorly-,

threaded sections, one of said sections having en irregular aperture extending ltherethrough and the other an raperture therein adjacent thefirst section, said sections having on their proximate ends faces adapted to frictionally IO engage with each other;




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2430532 *Feb 20, 1945Nov 11, 1947Rayburn Ralph WPin setting tool
US2446846 *Jul 10, 1943Aug 10, 1948Lilly Florence Shirley NobleJoint construction
US2522994 *Jul 19, 1946Sep 19, 1950Gen ElectricElectric circuit interrupter
US2530560 *Jul 5, 1947Nov 21, 1950Young Charles ASafety lock for firearms
US2573123 *Jan 7, 1948Oct 30, 1951Cornell Dubilier ElectricApparatus and procedure for filling electrical capacitors and the like
US2607616 *May 20, 1946Aug 19, 1952Davidson Leo RHandle for valve stems and the like
US2629175 *Aug 3, 1949Feb 24, 1953Rocky Mountain Arms EquipmentTelescope sight mount for rifles
US2717004 *Apr 18, 1949Sep 6, 1955Page Oil Tools IncMultiple valve
US2775913 *Jul 20, 1955Jan 1, 1957John DelisoSelf-gripping tool with resilient wires for turning socket head fasteners
US2830635 *Jul 20, 1954Apr 15, 1958Harold C ThorstensSelf-locking set screw having frangible intermediate portion
US2953165 *May 16, 1957Sep 20, 1960Reynolds Charles BMulti-purpose syphoning valve
US2954993 *Nov 4, 1957Oct 4, 1960Moog Industries IncBall joint assembly
US3044584 *May 27, 1959Jul 17, 1962Harris Foundry & Machine CoHollow cap screw assembly with displaceable plug
US3058211 *Sep 29, 1958Oct 16, 1962Harold B AxtellMethod and apparatus for securing a stud or screw
US3144293 *Sep 13, 1962Aug 11, 1964Allen Bradley CoDual terminal connector
US3375836 *Oct 23, 1965Apr 2, 1968Lara DomeneghettiFolding and automobile-transportable camping tent
US3641860 *Nov 14, 1969Feb 15, 1972Lawrence V Whistler JrPunch retainer assembly
US3909077 *Aug 20, 1973Sep 30, 1975Leco CorpPivot assembly mounting apparatus
US4299318 *Feb 22, 1979Nov 10, 1981Shimano Industrial Company LimitedUnit hub for bicycles
US4309140 *Oct 3, 1979Jan 5, 1982LeVone A. BloughSelf-locking threaded fastener and unlocking tool combination
US4386393 *Oct 21, 1980May 31, 1983Pike Machine Products CompanyAdjustable frictional drag lamp swivel
US4890521 *May 15, 1989Jan 2, 1990Crysler Motors CorporationSelf-gripping power screw driver bit
US5070662 *May 15, 1990Dec 10, 1991Robbins, Inc.Insert for locking portable dance floor sections
US5697929 *Oct 18, 1995Dec 16, 1997Cross Medical Products, Inc.Self-limiting set screw for use with spinal implant systems
US6056753 *Jul 13, 1998May 2, 2000Jackson; Roger P.Set screw for use with osteosynthesis apparatus
US6059786 *Oct 22, 1998May 9, 2000Jackson; Roger P.Set screw for medical implants
US6102913 *Oct 22, 1998Aug 15, 2000Jackson; Roger P.Removeable set screw for medical implant
US6179841Jul 27, 1998Jan 30, 2001Medtronic Sofamor Danek, IncorporatedSet screw for use with osteosynthesis apparatus
US6193719Sep 20, 1999Feb 27, 2001Sofamor S.N.C.Threaded clamping plug for interconnecting two implants of a spinal osteosynthesis instrumentation or other implants
US6224596Jun 10, 1998May 1, 2001Roger P. JacksonSet screw for use with osteosynthesis apparatus
US6454768Dec 5, 2000Sep 24, 2002Roger P. JacksonRemovable gripping set screw
US6454772Dec 8, 2000Sep 24, 2002Roger P. JacksonSet screw for medical implant with gripping side slots
US6478795Aug 24, 1995Nov 12, 2002Sofamor S.N.C.Torque limiting clamping plug for osteosynthesis instrumentation
US6726687Nov 9, 2001Apr 27, 2004Jackson Roger PClosure plug for open-headed medical implant
US6997927Feb 20, 2004Feb 14, 2006Jackson Roger Pclosure for rod receiving orthopedic implant having a pair of spaced apertures for removal
US7231253Dec 11, 2003Jun 12, 2007Medtronic, Inc.IMD connector header with grommet retainer
US7648506 *Dec 16, 2003Jan 19, 2010Depuy Acromed, Inc.Pivoting implant holder
US7648507Dec 16, 2003Jan 19, 2010Depuy Acromed, Inc.Pivoting implant holder
US7846187Jan 29, 2004Dec 7, 2010Jackson Roger PClosure plug for open headed medical implant
US8128667Oct 5, 2007Mar 6, 2012Jackson Roger PAnti-splay medical implant closure with multi-surface removal aperture
US8137386Aug 28, 2003Mar 20, 2012Jackson Roger PPolyaxial bone screw apparatus
US8257402Sep 4, 2012Jackson Roger PClosure for rod receiving orthopedic implant having left handed thread removal
US8273109Apr 26, 2004Sep 25, 2012Jackson Roger PHelical wound mechanically interlocking mating guide and advancement structure
US8282673Oct 9, 2012Jackson Roger PAnti-splay medical implant closure with multi-surface removal aperture
US8343160Jan 1, 2013Depuy Spine, Inc.Pivoting implant holder
US8366753Feb 5, 2013Jackson Roger PPolyaxial bone screw assembly with fixed retaining structure
US8377100May 9, 2002Feb 19, 2013Roger P. JacksonClosure for open-headed medical implant
US8398682May 12, 2010Mar 19, 2013Roger P. JacksonPolyaxial bone screw assembly
US8591552Aug 2, 2012Nov 26, 2013Roger P. JacksonAnti-splay medical implant closure with multi-surface removal aperture
US8814913Sep 3, 2013Aug 26, 2014Roger P JacksonHelical guide and advancement flange with break-off extensions
US8852239Feb 17, 2014Oct 7, 2014Roger P JacksonSagittal angle screw with integral shank and receiver
US8870928Apr 29, 2013Oct 28, 2014Roger P. JacksonHelical guide and advancement flange with radially loaded lip
US8876868Apr 8, 2005Nov 4, 2014Roger P. JacksonHelical guide and advancement flange with radially loaded lip
US8911478Nov 21, 2013Dec 16, 2014Roger P. JacksonSplay control closure for open bone anchor
US8920425Dec 5, 2012Dec 30, 2014DePuy Synthes Products, LLCPivoting implant holder
US8926670Mar 15, 2013Jan 6, 2015Roger P. JacksonPolyaxial bone screw assembly
US8926672Nov 21, 2013Jan 6, 2015Roger P. JacksonSplay control closure for open bone anchor
US8936623Mar 15, 2013Jan 20, 2015Roger P. JacksonPolyaxial bone screw assembly
US8998960May 17, 2013Apr 7, 2015Roger P. JacksonPolyaxial bone screw with helically wound capture connection
US9308027Sep 13, 2013Apr 12, 2016Roger P JacksonPolyaxial bone screw with shank articulation pressure insert and method
US20040122481 *Dec 11, 2003Jun 24, 2004Tidemand Kevin K.Connector header for an implantable medical device
US20040167523 *Feb 20, 2004Aug 26, 2004Jackson Roger P.Closure for rod receiving orthopedic implant having a pair of spaced apertures for removal
US20040186478 *Jan 29, 2004Sep 23, 2004Jackson Roger P.Closure plug for open headed medical implant
US20050131419 *Dec 16, 2003Jun 16, 2005Mccord DavidPivoting implant holder
US20050131420 *Dec 16, 2003Jun 16, 2005Techiera Richard C.Pivoting implant holder
US20050131483 *Dec 11, 2003Jun 16, 2005Jennifer ZhaoConnector header setscrew for an implantable medical device
US20100094359 *Dec 15, 2009Apr 15, 2010Depuy Spine, Inc.Pivoting implant holder
Cooperative ClassificationB21K1/707, Y10S411/931, Y10S411/929, Y10S411/919