US3343439A - Connector plate - Google Patents

Connector plate Download PDF

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Publication number
US3343439A
US3343439A US475632A US47563265A US3343439A US 3343439 A US3343439 A US 3343439A US 475632 A US475632 A US 475632A US 47563265 A US47563265 A US 47563265A US 3343439 A US3343439 A US 3343439A
Authority
US
United States
Prior art keywords
tooth
teeth
end portion
shank
opening
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
Application number
US475632A
Other languages
English (en)
Inventor
Gerald A Koenigshof
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Timber Engineering Co
Original Assignee
Timber Engineering Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Timber Engineering Co filed Critical Timber Engineering Co
Priority to US475632A priority Critical patent/US3343439A/en
Priority to GB18196/66A priority patent/GB1087965A/en
Priority to DE19661609528 priority patent/DE1609528A1/de
Priority to FR62179A priority patent/FR1482280A/fr
Priority to NL6608546A priority patent/NL6608546A/xx
Priority to BE682833A priority patent/BE682833A/xx
Application granted granted Critical
Publication of US3343439A publication Critical patent/US3343439A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F16B15/00—Nails; Staples
    • F16B15/0023—Nail plates
    • F16B15/003—Nail plates with teeth cut out from the material of the plate
    • F16B15/0038—Nail plates with teeth cut out from the material of the plate only on the perimeter of the plate
    • 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
    • F16B15/00—Nails; Staples
    • F16B15/0023—Nail plates
    • F16B15/003—Nail plates with teeth cut out from the material of the plate
    • F16B15/0046—Nail plates with teeth cut out from the material of the plate from the body of the plate
    • 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
    • F16B15/00—Nails; Staples
    • F16B15/04—Nails; Staples with spreading shaft
    • 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
    • Y10S411/921—Multiple-pronged nail, spike or tack

Definitions

  • Connector plates are commonly used for securing together abutting wood members to form structures, such as wood roof trusses that are used in the construction of buildings.
  • the wood members are arranged in co-planar, abutting relation and a connector plate is secured to the wood members and extends over the joint.
  • connector plates are provided on opposite sides of the wood members.
  • the connector plates have teeth which are struck from the plate and project outwardly on one side of the plate. The teeth are driven into the wood members simultaneously by means of a press.
  • the connector plates are rigidly fastened to the Wood members by the nail-like teeth and transmit forces between the wood members. Additional fasteners, such as nails, are not normally used with the connector plates for fastening together the wood members.
  • the connector plates It is important for the connector plates to have a maximum tensile strength per unit of cross sectional area, but when the teeth are struck from the plate, the metal removed in forming the teeth reduces the net unit cross sectional area of the plate and substantially reduces the tensile strength of the plate.
  • a large number of teeth are important to assure that the stress in the wood members is transmitted to the connector plate and to cause the connector plate to be tightly secured to the wood members.
  • Conventional connector plates usually represent a compromise between obtaining the maximum tensile strength per unit cross sectional area and providing a maximum number of teeth.
  • teeth may not provide sutficient gripping action in the wood to prevent the connector plate from being pulled out of the wood members when it is under stress.
  • the wood fibers tend to push the teeth of the connector plate back out of the wood member, as the wood dries out.
  • the teeth are made relatively long in relation to their width in order to increase the gripping surface, they have a tendency to buckle when the plate is being pressed into the wood members, particularly if the wood is dense. When a tooth buckles, it interferes with the connector plate being pressed fiat against the face of the wood member, and instead of providing additional gripping action for the plate, the buckled tooth reduces the net cross sectional area of the plate.
  • the wood structural members of a truss intersect at various angles with respect to each other.
  • the Wood grain runs generally longitudinally of the member and fiat teeth as commonly used in connector plates are more easily inserted with the wide faces of the teeth parallel to the wood grain.
  • the teeth tend to separate the wood fibers and pass between them rather than to sever the fibers as would teeth which extend across the grain. It is preferable for the teeth to cut the wood fibers, since the severed fibers become wedged against the faces of the teeth and resist withdrawal of the teeth.
  • the difficulty in orienting the teeth on the plate is that the structural members are arranged in various angular relations to the connector plate and the orientation of the teeth with respect to the Wood grain of the structural members cannot be predetermined.
  • a connector plate in the form of a flat metal plate having teeth individually struck from the plate.
  • the teeth are bent out on one side of the plate and arranged in rows extending in the opposite direction from the shank of adjacent teeth of the row.
  • the teeth are elongated and are inclined laterally in an upright plane with respect to the plane of the plate.
  • Each tooth at its free end is bent outwardly from the opening in the plate and the rounded point of the tooth is offset away from the direction of incline of the tooth.
  • the wide, flat sides of each tooth are arranged at an acute angle with respect to the adjacent teeth.
  • FIG. 1 is a top plan view of the connector plate of this invention
  • FIG. 2 is a cross sectional view of the connector plate along the line 2-2 in FIG. 1;
  • FIG. 3 is an enlarged cross sectional view of the connector plate along the line 3-3 in FIG. 1;
  • FIG. 4 is an enlarged cross sectional view of the connector plate along the line 44 in FIG. 1.
  • the connector plate of this invention includes a substantially flat sheet 2.
  • the sheet 2 has perforations 4 at a plurality of locations to form teeth 6 from the sheet 2.
  • Each perforation is in the form of an irregular loop, so that the metal in the center of the loop is attached to the sheet 2 -only across the ends of the loop.
  • Each of the loop portions is bent outwardly on one side of the plate to form a tooth 6, as shown in FIG. 2.
  • the perforations are arranged in rows 8 and 10,
  • each perforation has a base extending across the end of the loop of the perforation 4 and each tooth 6 is connected to the sheet 2 along the base of the perforation.
  • alternate perforations 4 in the same row have a base 12 extending substantially in the same direction and obliquely to the longitudinal axis of the row 8.
  • alternate teeth face in the same direction, while adjacent teeth face in opposite directions.
  • the bases 14 of the other teeth in the row 8 extend. obliquely to the axis of the row 8 at a substantially equal but opposite angle from the base 12.
  • the baseslZ at an angle of about 20.
  • the first perforation 4 has a base 16 which is substantially parallel to the base 14 of the alternate teeth in the first row 8, although the loop of the perforation extends in the opposite direction from that of the alternate teeth in the first row 8.
  • the alternate teeth in the rows 8 and 10 are offset with respect to the longitudinal axis of the row and are also offset with respect to the teeth in adjacent rows.
  • each tooth Since the base of each tooth extends obliquely to the transverse axis of the sheet 2, the teeth are inclined with respect to the plane of the sheet 2, as shown in FIGS. 2 and 3.
  • the orientation of the bases 12, -14 and 16 with respect to the longitudinal axes of the rows 8 and 10 determines whether the tooth 6 will be inclined in one direction or the other when the tooth is bent outwardly from the sheet 2.
  • Each tooth has a root portion 18, a shank portion 20, and an end portion 22.
  • the teeth have a substantially greater width than thickness.
  • the root portion 18 has sloping lateral edges and the opposite edges of the shank portion 20 are substantially parallel to each other.
  • the longitudinal axis of the shank portion is inclined with respect to the plane of the sheet 2.
  • the tooth 6 is inclined both in the plane of'the wide faces of the shank portion 20 and also in the plane of the lateral edges, as shown in FIG. 4.
  • the end portion 22 of the tooth is generally in the form of a right triangle with the rounded point 24 of the tooth being offset from the longitudinal axis of the shank portion 20.
  • the end portion 22 is bent along the line separating the shank portion and the end portion, so that it is inclined in the opposite direction from that of the shank portion 20 and the root portion 18, as shown in FIG. 4.
  • each tooth causes the tooth 6 when pressed into a wood member to be deflected laterally by the force of the wood fibers against the longer lateral edges of the shank portion 20 and of the root portion 18, which are the left hand lateral edges, as viewed in FIG. 3.
  • the tooth 6 is being deflected laterally, it is also being deflected generally in the direction of the slope of the end portion 22 by the force of the wood fibers on the face of the end portion. Since the rounded point 24 is offset from the longitudinal axis of the shank portion 20, there is a tendency for the tooth to twist as it is being pressed into the wood member. Furthermore, as shown in FIG.
  • the teeth in the same row have different orientations with respect to the longitudinal axis of the row.
  • This feature in combination with the outwardly bent end portion of each tooth, causes the teeth to sever some of the wood fibers regardless of the orientation of the sheet 2 with respect to the woodgrain in the structural member.
  • the connector plate of this invention has teeth of a particular shape that causes them to be twisted when pressed into wood members.
  • the teeth are so tightly secured in the wood that the roof truss can be subjected to lateral forces during transporation and erection without causing the teeth to pull out of the wood.
  • the plate maintains a high tensile strength, although a large number of teeth are punched from the plate.
  • the inclined teeth provide an enlarged area of contact with the wood fibers, without a corresponding decrease in the cross sectional area of the sheet 2.
  • a connector plate for joining together abutting wood members comprising:
  • each opening having a single tooth projecting therefrom, said tooth projecting from one side of each opening, said one side being substantially straight, said openings being in the shape of the profile of the tooth and being arranged in a plurality of rows,
  • said tooth having a root portion joined to the sheet and a shank portion joined to the root portion and an end portion joined to the shank portion
  • said root portion being substantially fiat and being wider than said shank portion and end portion, said root portion having opposite edges converging toward said shank portion, one of said root portion edges having a greater length than the opposite root portion edge,
  • said shank portion having a substantially greater width than thickness and a substantially uniform width, said root and shank portions being angularly inclined toward said opening with respect to the plane of said sheet, said end portion being angularly inclined away from said opening with respect to the plane of said sheet,
  • end portion edges having opposite edges, one of said end portion edges being a continuation of said shank edge adjacent said one root portion edge and the other of said end portion edges being inclined at an acute angle with respect to said one end portion edge to define a penetrating point
  • said opening having a longitudinal axis extending substantially parallel to the edges of the opening which correspond to said shank portion, said straight side defining an axis intersecting said longitudinal axis at an acute angle, whereby the tooth is deformed upon being inserted in wood members and resists withdrawal.
  • the connector plate according to claim 2 including a second row of said openings adjacent the first mentioned row of openings, said straight sides of alternate openings in said second row being at the same end of said openings and said straight sides of adjacent openings in said second row being at the opposite ends of said openings, straight sides of said adjacent openings in said first and second rows defining axes converging toward one end of said first row.
  • first and second rows are substantially parallel, straight sides of adjacent openings in said first row converging toward one end of said first row and straight sides of adjacent openings in said second row converging toward the opposite end of said second row.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Joining Of Building Structures In Genera (AREA)
US475632A 1965-07-29 1965-07-29 Connector plate Expired - Lifetime US3343439A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US475632A US3343439A (en) 1965-07-29 1965-07-29 Connector plate
GB18196/66A GB1087965A (en) 1965-07-29 1966-04-26 A connector plate for joining together abutting wood members
DE19661609528 DE1609528A1 (de) 1965-07-29 1966-05-12 Verbindungsplatten
FR62179A FR1482280A (fr) 1965-07-29 1966-05-18 Plaque de liaison pour assembler bout à bout des pièces de bois
NL6608546A NL6608546A (xx) 1965-07-29 1966-06-20
BE682833A BE682833A (xx) 1965-07-29 1966-06-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US475632A US3343439A (en) 1965-07-29 1965-07-29 Connector plate

Publications (1)

Publication Number Publication Date
US3343439A true US3343439A (en) 1967-09-26

Family

ID=23888441

Family Applications (1)

Application Number Title Priority Date Filing Date
US475632A Expired - Lifetime US3343439A (en) 1965-07-29 1965-07-29 Connector plate

Country Status (5)

Country Link
US (1) US3343439A (xx)
BE (1) BE682833A (xx)
DE (1) DE1609528A1 (xx)
GB (1) GB1087965A (xx)
NL (1) NL6608546A (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318652A (en) * 1979-06-29 1982-03-09 Truswal Systems Corporation Connector plate
US5116179A (en) * 1984-02-23 1992-05-26 Matlock Gordon E Nail end plate for wooden ties
FR2748072A1 (fr) * 1996-04-30 1997-10-31 Rapid Sa Attache de liaison jointive de deux elements
US20100189496A1 (en) * 2007-09-11 2010-07-29 Roger Smith Timber connectors and noggings

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US272685A (en) * 1883-02-20 Belt-fastener
US3090088A (en) * 1962-05-07 1963-05-21 Foley & Lavish Engineering Co Connector device
US3211043A (en) * 1962-05-21 1965-10-12 Sanford Ind Inc Corrugated connector plate having notched teeth

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US272685A (en) * 1883-02-20 Belt-fastener
US3090088A (en) * 1962-05-07 1963-05-21 Foley & Lavish Engineering Co Connector device
US3211043A (en) * 1962-05-21 1965-10-12 Sanford Ind Inc Corrugated connector plate having notched teeth

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318652A (en) * 1979-06-29 1982-03-09 Truswal Systems Corporation Connector plate
US5116179A (en) * 1984-02-23 1992-05-26 Matlock Gordon E Nail end plate for wooden ties
FR2748072A1 (fr) * 1996-04-30 1997-10-31 Rapid Sa Attache de liaison jointive de deux elements
US20100189496A1 (en) * 2007-09-11 2010-07-29 Roger Smith Timber connectors and noggings

Also Published As

Publication number Publication date
DE1609528A1 (de) 1970-04-02
NL6608546A (xx) 1967-01-30
BE682833A (xx) 1966-12-01
GB1087965A (en) 1967-10-18

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