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US113006A - Improvement in wood screws - Google Patents

Improvement in wood screws Download PDF

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Publication number
US113006A
US113006A US113006DA US113006A US 113006 A US113006 A US 113006A US 113006D A US113006D A US 113006DA US 113006 A US113006 A US 113006A
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Prior art keywords
screw
thread
point
groove
spiral
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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 OR WEDGES; JOINTS OR JOINTING
    • F16B25/00Screws that cut thread in the body into which they are screwed, e.g. wood screws

Definitions

  • FIGS 2 and 3 are similar views of the new forms of screws.
  • This invention relates to certain novel improvements on the construction of wood screws of that class having tapering screw-points.
  • My object is to vproduce a screw which will enter more readily into wood and afi ord as firm a hold at the point, in proportion to its diameter, as at any other part.
  • my invention consists in producing a long tapering point upon the end of a screw by terminating the flat bottom groove'which produces the helical thread upon the body or core in a spiral groove which is curved transversely.
  • 13 represents the shank of the screw, which may be made of the usual cylindrical form, terminated at o'ne end with a head of the usual form.
  • the point D also presents the same abruptness.
  • This groove enters deeper and deeper I into the body of the screw as it progresses, and finally terminates in a groove, 0, having a flat base, which may produce a thread of the usual well-known form; or, if desirable, the cutting-tool for making the flat bottom groove 0 may be shaped so as to leave a thread having its sides convex.
  • the curved base groove produces a thread having concave sides, as shown in figs. 4 and 5.
  • the rounded base groove I By making the rounded base groove I have a thread which has great strength, and which will take a very firm hold in woodat the commencement of entering a screw.
  • the core of the thread at the entering point is so rapidly reduced that a spiral point is left which extends beyondthe terminus of said core.

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

Description

WOOD SGRBW.
! A J. A. BIDWELL.
I a No 113,006. Patented Mar. 28, 1871.
JASON A. BIDWELL, OF EAST BOSTON, MASSACHUSETTS.
Letters Patent No. 113,006, dated March 28, 1871.
IMPROVEMENT IN WOOD SCREWS.
The Schedule referred to in these Letters Patent and making part of the lame.
To all whom it may concern.-
Be it known that I, J ason A. BIDWELL, of East Boston, in the county of Suffolk and State of Massachusetts, have invented a new and improved Wood Screw; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being bad to the accompanying drawings making a part of this specification, in which- Figure 1 shows the old form of screw as it would appear if stripped of its thread.
Figures 2 and 3 are similar views of the new forms of screws.
Figures 4, 5, fishow the improved form of threads.
Similar letters of reference indicate corresponding parts in the several figures.
This invention relates to certain novel improvements on the construction of wood screws of that class having tapering screw-points.
My object is to vproduce a screw which will enter more readily into wood and afi ord as firm a hold at the point, in proportion to its diameter, as at any other part.
The nature of my invention consists in producing a long tapering point upon the end of a screw by terminating the flat bottom groove'which produces the helical thread upon the body or core in a spiral groove which is curved transversely.
- It also consists in terminating'the helical thread at the shank of the screw in a spiral thread having a groove with a transversely-curved bottom, correspond. ing" to the thread upon the point of the screw, as will be hereinafter described.
To enable others skilled in the art to understand my invention, I will describe its construction and operation. y
In the accompanying drawings- A reprcsentsthe core or body of the screw, which may be made cylindrical, as shown in fig. 2, or it may be made slightly tapering, as shown in fig. 3.
13 represents the shank of the screw, which may be made of the usual cylindrical form, terminated at o'ne end with a head of the usual form.
In the old form of tapering pointed-screws, shown in fig. 1, the part lettered a, which is at the junction of the core with the shank, is the frustum of a cone, with straight sides, and presents a very abrupt shoulder.
The point D also presents the same abruptness.
In the improved screw, represented by figs. 2, 3, 4, 5, itwill be seen that the shoulder at a, as well as the point i), are produced by gradual curves.
In cutting the thread upon my improved screw I commence with a rounded point-cutting tool, which will produce a groove, 0, thatis transversely curved, as
shown in fig. This groove enters deeper and deeper I into the body of the screw as it progresses, and finally terminates in a groove, 0, having a flat base, which may produce a thread of the usual well-known form; or, if desirable, the cutting-tool for making the flat bottom groove 0 may be shaped so as to leave a thread having its sides convex. The curved base groove produces a thread having concave sides, as shown in figs. 4 and 5.
By this mode of running the thread at the sham or commencement of cutting it will be seen that there will be a spiral threadformed presenting a positive thread or ridge from its commencement on the circumference of the shank B to its terminus in the flat bottom thread e.
- The same principle is carried out in producing the point or entering end of the screw, and the same rounded-lip cutting-tool .may be used in this last operation.
'lhe flat base groove 0 terminates just at the point where .the entering end of the screw begins to receive its taper, in a groove, c, which has a rounded base,
and which approaches the axis of the screw so as to terminate the screw in a spiral gimlet-point.
By making the rounded base groove I have a thread which has great strength, and which will take a very firm hold in woodat the commencement of entering a screw. The core of the thread at the entering point is so rapidly reduced that a spiral point is left which extends beyondthe terminus of said core.
While I prefer to have both ends of the flat base helical groove 0 terminated by the spiral-curved base grooves, as I have above described, Ido not confine myself to having the curved base grooves at both ends of the core, as a very good screw, possessing advantages over the old forms of wood screws, may be made by producing the point of the screw only in the manner described.
Having described my invention,
What I claim as new, and desire to secure by Letters Patent, is
1. The combination of the spiral concave score 0', forming the point of the screw, with the flat bottom thread e, forming the body of the screw, substantially as described.
2. The combination of the spiral concave score 0', at the shank of the screw, with the flat bottom thread ve, substantially as described.
3. The combination of the spiral concave scores 0 c with the intermediate fiat bottom score 6, substantially as described.
JASON A. BIDWELL.
Witnesses WM. H. PULLEN, STEPHEN A. 000m, Jr.
US113006D Improvement in wood screws Expired - Lifetime US113006A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5800107A (en) * 1996-04-19 1998-09-01 Giannuzzi; Louis N. Self-tapping, screw-type masonry anchor
US20080019796A1 (en) * 2004-02-25 2008-01-24 Robert Dicke Thread Forming Screw
US7798756B2 (en) * 2007-03-24 2010-09-21 Essence Method Refine Co., Ltd. Screw with waved thread
US8419332B2 (en) 2007-10-19 2013-04-16 Atlas Bolt & Screw Company Llc Non-dimpling fastener
USD908476S1 (en) * 2016-12-20 2021-01-26 Avvio Gmbh & Co Kg Screw
DE102021126035A1 (en) 2021-10-07 2023-04-13 MFI-Metall Fastening Industrie GmbH wood screw

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5800107A (en) * 1996-04-19 1998-09-01 Giannuzzi; Louis N. Self-tapping, screw-type masonry anchor
US20080019796A1 (en) * 2004-02-25 2008-01-24 Robert Dicke Thread Forming Screw
US7785055B2 (en) * 2004-02-25 2010-08-31 A-Z Ausrustung Und Zubehor Gmbh & Co. Kg Thread forming screw
US7798756B2 (en) * 2007-03-24 2010-09-21 Essence Method Refine Co., Ltd. Screw with waved thread
US8419332B2 (en) 2007-10-19 2013-04-16 Atlas Bolt & Screw Company Llc Non-dimpling fastener
USD908476S1 (en) * 2016-12-20 2021-01-26 Avvio Gmbh & Co Kg Screw
DE102021126035A1 (en) 2021-10-07 2023-04-13 MFI-Metall Fastening Industrie GmbH wood screw

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