US1151861A - Countersinking screw-head. - Google Patents

Countersinking screw-head. Download PDF

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Publication number
US1151861A
US1151861A US1914840579A US1151861A US 1151861 A US1151861 A US 1151861A US 1914840579 A US1914840579 A US 1914840579A US 1151861 A US1151861 A US 1151861A
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Prior art keywords
head
screw
flutes
wood
surface
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Expired - Lifetime
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Ernest M Brumback
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Ernest M Brumback
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGES, JOINTS OR JOINTING
    • F16B35/00Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/06Specially-shaped heads

Description

ERNEST M. BEUMEACK, 0E SILVER CITY, NEW MExIco.

COUNTERSINKING- SCREW-HEAD.

Specification of Letters Patent.

Parenteel aug. si, reis.

Application filed 'May 23,1914. Serial No. 840,579.

T0 all whom t may concern Be it known that l, ERNEST M. BRUM- BACK, a citizen of the United States, residing at Silver City, in the county of Grant and State of New Mexico, have invented a new and useful Countersinking Screw-Head, of which the following is a specification.

This invention relates to improvements in screw heads and more particularly to that class which are known as self countersin'kh object of the present invention is to provide a screw head which in addition to being self countersinking, will exert a continuously increasing tightening action as the screw head is driven in the wood. i

A further object is to provide a screw head with a plurality or multiplicity of flutes so arranged and shaped that the head will exert a continually increasing tightening effect as the head is cutting its way into the wood to a countersunk position. The flutes terminate below the upper plane of the head so as to form a continuous unfluted rim portion, preventing the chips and cut material from escaping from the flutes after the head has reached its countersunk position, thus exerting a maximum tightening effect.

With the foregoing and other objects in View which will appear as' the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can be made within the scope of what is claimed, without departing from the spirit of the invention.

In the drawings accompanying this specification and forming a part thereof, the preferred embodiment of my invention is illustrated, in which Figure 1 is a View in elevation of a screw l head formed along the lines of my invention. Fig. 2 is a cross sectional view taken on the line 2 2, looking in the direction of the arrow. Figs. 3, 4 and 5 are sectional views taken on the lines 3 3, 4 4 and 5 5 respectively, of Fig.-l.v y

Referring to the drawings in which similar reference numerals designate corresponding partsthroughout the several views, the

. screw includes the usual shank 6', of which a portion only has been depicted and above which extends the beveled head 7. The slot 8 extends transversely of the head and the screw as thus far described is of the conventional construction.

The conical surface 9 of the screw head is provided with a multiplicity of flutes l0. Each flute 10 is in transverse section as illustrated in Figs. 2, 3 and 4, substantially V- shape with the one surface l1 extending substantially radial and with the adjoining surface l2 disposed at an angle thereto, thus defining the cutting edge 13. The flutes gradually taper in depth, diminishing toward their upper extremity and gradually merge into the conical surface at a point below the top surface of the screw head. Thus an unbroken conical surface or rim 14 is defined above the upper extremities of the flutes, as apparent from Figs. l and 2. The flutes gradually deepen toward their lower extremities and project a slight distance below the cylindrical surface of the shank 6. The curvature of the flutes is of helical characteristics, winding or twisting about the head in a direction opposite to that of rotation during the insertion of the screw.

Vith the screw head as thus formed, a continually increasing tightening eect will be obtained as the head is driven into the wood. The lower portion ofthe beveled head being provided with deep and sharp flutes readily cuts the wood, thus providing for the countersinking of the lower portion of the head. The chips and out material will be passed upwardly within the flutes and will escape therefrom. As the head is driven into the wood, the opening defined by the flutes and adjacent wall of the wood becomes more restricted and the chips gradually clog. The decreasing depth of the flutes amplifies this clogging action until such time that the upper extremities of the flutes pass below the surface of the wood. At this point a maximum tightening effect will be obtained, preventing the head from passing below the surface of the wood as will be readily apparent. The rim 14, the continuity of whose surface has been preserved, exerts the proper wedging action upon the wood to thus insure a firm purchase thereon and the requisite tightening effect of the screw. The gradual decrease in the depth of the flutes provides for different degrees of tightening or holding effect at intermediate points in the countersinking action of the head. Thus the depth to which the head is countersunk may be taken as an indication of the tightening action or effect exerted by the screw. Particular attention is called to the fact that the flutes intersect at their lower extremities to form a plurality of knife-'like e'dges 15 Which are slightly curved as illustrated in Fig. 1,providing for an efiicacious and rapid cutting action at this zone.

Having thus fully described my invention. What I claim is A frusto-conical head for Wood screws, comprising a beveled surface provided With a multiplicity of flutes intersecting throughout their extremities adjacent the apex of the head and diverging at their other eX- tremities to define a multiplicity of in- Wardly curved thin cutting blades With relatively Wide clearing spaces, the amount of unbroken surface of the head increasing toward the top thereof and finishing at an unbroken rim.

In testimony that I claim the foregoing as my own, I have hereto aixed my signature in the presence oftwo Witnesses.

ERNEST M. BRUMBACK.

Witnesses:

E` WooDHULL, H. L. OAKES.

US1151861A 1914-05-23 1914-05-23 Countersinking screw-head. Expired - Lifetime US1151861A (en)

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US1151861A US1151861A (en) 1914-05-23 1914-05-23 Countersinking screw-head.

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US1151861A US1151861A (en) 1914-05-23 1914-05-23 Countersinking screw-head.

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US1151861A true US1151861A (en) 1915-08-31

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US1151861A Expired - Lifetime US1151861A (en) 1914-05-23 1914-05-23 Countersinking screw-head.

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Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3322019A (en) * 1964-07-28 1967-05-30 Screw & Bolt Corp Of America Plasterboard screw
US4764066A (en) * 1985-04-22 1988-08-16 Farley Metals, Inc. Light gauge self-tapping sheet metal screw
US5199839A (en) * 1991-10-09 1993-04-06 Abbott-Interfast Corporation Fastener screw having improved installation and self-locking characteristics
US5203657A (en) * 1991-05-29 1993-04-20 Topura Co., Ltd. Self-tapping screw
US5205694A (en) * 1991-05-29 1993-04-27 Topura Co., Ltd. Self-tapping screw
US5249882A (en) * 1991-05-29 1993-10-05 Topura Co., Ltd. Self-tapping screw
US5275601A (en) * 1991-09-03 1994-01-04 Synthes (U.S.A) Self-locking resorbable screws and plates for internal fixation of bone fractures and tendon-to-bone attachment
US5772376A (en) * 1995-05-29 1998-06-30 Ejot Verbindungstechnik Gmbh & Co. Kg Countersunk head screw
WO2004026159A1 (en) * 2002-09-17 2004-04-01 Depuy Spine Sarl Cervical vertebra plate
US20040193164A1 (en) * 2003-03-27 2004-09-30 Orbay Jorge L. Anatomical distal radius fracture fixation plate and methods of using the same
US20050063796A1 (en) * 2003-09-05 2005-03-24 Robert Dicke Countersunk screw
US20050065520A1 (en) * 2002-12-10 2005-03-24 Orbay Jorge L. Endosteal nail
US20050281634A1 (en) * 2004-06-18 2005-12-22 Patricia Tibbenham Waffle stud for insert molded plastic members
US20070043366A1 (en) * 2003-04-03 2007-02-22 Medartis Ag Housing for a locking element and locking element
US7527639B2 (en) 2000-02-01 2009-05-05 Depuy Products, Inc. Fixation system with multidirectional bone supports
US7563263B2 (en) 2000-02-01 2009-07-21 Depuy Products, Inc. Intramedullary fixation device for metaphyseal long bone fractures
US20100069970A1 (en) * 2008-09-16 2010-03-18 Lewis Derek S Orthopedic compression screw
US7695502B2 (en) 2000-02-01 2010-04-13 Depuy Products, Inc. Bone stabilization system including plate having fixed-angle holes together with unidirectional locking screws and surgeon-directed locking screws
US7727264B2 (en) 2000-02-01 2010-06-01 Depuy Products, Inc. Intramedullary fixation device for metaphyseal long bone fractures
US7905909B2 (en) 2005-09-19 2011-03-15 Depuy Products, Inc. Bone stabilization system including multi-directional threaded fixation element
US20110238122A1 (en) * 2008-10-31 2011-09-29 Georg Gradl Implant and bone screw having interlocking cams
US20110313466A1 (en) * 2010-06-17 2011-12-22 Butler Michael S Spinal Facet Bone Screw System
EP2522865A1 (en) * 2011-05-12 2012-11-14 Berner Trading Holding GmbH Countersunk head screw
US20160290382A1 (en) * 2015-03-30 2016-10-06 Illinois Tool Works Inc. Fastener with saw tooth perimeter
US20160297542A1 (en) * 2015-04-10 2016-10-13 The Boeing Company Lightning damage resistant aircraft skin fasteners
US9554837B2 (en) 2007-05-03 2017-01-31 Medartis Ag Device for fixing an elongate element in a retaining structure
US9581183B2 (en) 2015-02-17 2017-02-28 The Hillman Group, Inc. Screw-type fastener
US20170254346A1 (en) * 2016-03-06 2017-09-07 Christopher Adam McLeod Threaded post with negative ribs

Cited By (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3322019A (en) * 1964-07-28 1967-05-30 Screw & Bolt Corp Of America Plasterboard screw
US4764066A (en) * 1985-04-22 1988-08-16 Farley Metals, Inc. Light gauge self-tapping sheet metal screw
US5203657A (en) * 1991-05-29 1993-04-20 Topura Co., Ltd. Self-tapping screw
US5205694A (en) * 1991-05-29 1993-04-27 Topura Co., Ltd. Self-tapping screw
US5249882A (en) * 1991-05-29 1993-10-05 Topura Co., Ltd. Self-tapping screw
US5275601A (en) * 1991-09-03 1994-01-04 Synthes (U.S.A) Self-locking resorbable screws and plates for internal fixation of bone fractures and tendon-to-bone attachment
US5199839A (en) * 1991-10-09 1993-04-06 Abbott-Interfast Corporation Fastener screw having improved installation and self-locking characteristics
US5772376A (en) * 1995-05-29 1998-06-30 Ejot Verbindungstechnik Gmbh & Co. Kg Countersunk head screw
US8403967B2 (en) 2000-02-01 2013-03-26 Biomet C.V. Volar fixation system and methods of using the same
US7695502B2 (en) 2000-02-01 2010-04-13 Depuy Products, Inc. Bone stabilization system including plate having fixed-angle holes together with unidirectional locking screws and surgeon-directed locking screws
US9572609B2 (en) 2000-02-01 2017-02-21 Biomet C.V. Method of using a volar bone plate on a fracture
US7563263B2 (en) 2000-02-01 2009-07-21 Depuy Products, Inc. Intramedullary fixation device for metaphyseal long bone fractures
US7527639B2 (en) 2000-02-01 2009-05-05 Depuy Products, Inc. Fixation system with multidirectional bone supports
US9492213B2 (en) 2000-02-01 2016-11-15 Biomet C.V. Volar fixation system
US7727264B2 (en) 2000-02-01 2010-06-01 Depuy Products, Inc. Intramedullary fixation device for metaphyseal long bone fractures
US9480512B2 (en) 2000-02-01 2016-11-01 Biomet C.V. Volar fixation system with fixed-angle multi-hole drill guide
US7780711B2 (en) 2000-02-01 2010-08-24 Depuy Products, Inc. Fixation system with multidirectional bone supports
US7229442B2 (en) * 2002-09-17 2007-06-12 DePuy Spine Sàrl Cervical vertebra plate
US20060142766A1 (en) * 2002-09-17 2006-06-29 Bernd Schafer Cervical vertebra plate
WO2004026159A1 (en) * 2002-09-17 2004-04-01 Depuy Spine Sarl Cervical vertebra plate
US7425213B2 (en) 2002-12-10 2008-09-16 Depuy Products, Inc. Method of endosteal nailing
US20050065528A1 (en) * 2002-12-10 2005-03-24 Orbay Jorge L. Method of endosteal nailing
US20050065520A1 (en) * 2002-12-10 2005-03-24 Orbay Jorge L. Endosteal nail
US7780664B2 (en) 2002-12-10 2010-08-24 Depuy Products, Inc. Endosteal nail
US7857838B2 (en) 2003-03-27 2010-12-28 Depuy Products, Inc. Anatomical distal radius fracture fixation plate
US20040193164A1 (en) * 2003-03-27 2004-09-30 Orbay Jorge L. Anatomical distal radius fracture fixation plate and methods of using the same
US8579946B2 (en) 2003-03-27 2013-11-12 Biomet C.V. Anatomical distal radius fracture fixation plate
US20070043366A1 (en) * 2003-04-03 2007-02-22 Medartis Ag Housing for a locking element and locking element
US9155577B2 (en) * 2003-04-03 2015-10-13 Medartis Ag Housing for a locking element and locking element
US20050063796A1 (en) * 2003-09-05 2005-03-24 Robert Dicke Countersunk screw
US7334976B2 (en) * 2003-09-05 2008-02-26 A—Z Ausrustung und Zubehor GmbH & Co. KG Countersunk screw
US9072558B2 (en) 2003-09-17 2015-07-07 Biomet C.V. Distal radius fracture fixation plate with ulnar buttress
US8556945B2 (en) 2003-09-17 2013-10-15 Biomet C.V. Anatomical distal radius fracture fixation plate with ulnar buttress
US20050281634A1 (en) * 2004-06-18 2005-12-22 Patricia Tibbenham Waffle stud for insert molded plastic members
US7156598B2 (en) * 2004-06-18 2007-01-02 Ford Global Technologies, Llc Waffle stud for insert molded plastic members
US7905909B2 (en) 2005-09-19 2011-03-15 Depuy Products, Inc. Bone stabilization system including multi-directional threaded fixation element
US9554837B2 (en) 2007-05-03 2017-01-31 Medartis Ag Device for fixing an elongate element in a retaining structure
US20100069970A1 (en) * 2008-09-16 2010-03-18 Lewis Derek S Orthopedic compression screw
US8394132B2 (en) * 2008-09-16 2013-03-12 Orthohelix Surgical Designs, Inc. Orthopedic compression screw
US8323321B2 (en) * 2008-10-31 2012-12-04 M.O.R.E. Medical Solutions Gmbh Implant and bone screw having interlocking cams
US20110238122A1 (en) * 2008-10-31 2011-09-29 Georg Gradl Implant and bone screw having interlocking cams
US20110313466A1 (en) * 2010-06-17 2011-12-22 Butler Michael S Spinal Facet Bone Screw System
EP2522865A1 (en) * 2011-05-12 2012-11-14 Berner Trading Holding GmbH Countersunk head screw
US9581183B2 (en) 2015-02-17 2017-02-28 The Hillman Group, Inc. Screw-type fastener
US20160290382A1 (en) * 2015-03-30 2016-10-06 Illinois Tool Works Inc. Fastener with saw tooth perimeter
US9856901B2 (en) * 2015-03-30 2018-01-02 Illinois Tool Works Inc. Fastener with saw tooth perimeter
US9669942B2 (en) * 2015-04-10 2017-06-06 The Boeing Company Lightning damage resistant aircraft skin fasteners
US20160297542A1 (en) * 2015-04-10 2016-10-13 The Boeing Company Lightning damage resistant aircraft skin fasteners
US20170254346A1 (en) * 2016-03-06 2017-09-07 Christopher Adam McLeod Threaded post with negative ribs

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