US2876048A - Scaffold assembly - Google Patents

Scaffold assembly Download PDF

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Publication number
US2876048A
US2876048A US444417A US44441754A US2876048A US 2876048 A US2876048 A US 2876048A US 444417 A US444417 A US 444417A US 44441754 A US44441754 A US 44441754A US 2876048 A US2876048 A US 2876048A
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United States
Prior art keywords
clamp
assembly
members
scaffold
scaffold assembly
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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
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US444417A
Inventor
Mccormick John
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JOHN MURNIGHAN
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JOHN MURNIGHAN
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Publication date
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Priority to US444417A priority Critical patent/US2876048A/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G7/00—Connections between parts of the scaffold
    • E04G7/02—Connections between parts of the scaffold with separate coupling elements
    • 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
    • F16B2/00—Friction-grip releasable fastenings
    • F16B2/02—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening
    • F16B2/06—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening external, i.e. with contracting action
    • F16B2/065—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening external, i.e. with contracting action using screw-thread elements
    • 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
    • F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
    • F16B7/04—Clamping or clipping connections
    • F16B7/044—Clamping or clipping connections for rods or tubes being in angled relationship
    • F16B7/048—Clamping or clipping connections for rods or tubes being in angled relationship for rods or for tubes without using the innerside thereof
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/34—Combined diverse multipart fasteners
    • Y10T24/3467—Pin
    • Y10T24/3468—Pin and pin
    • Y10T24/3475—Pin and pin having intermediate connector allowing movement
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/34—Combined diverse multipart fasteners
    • Y10T24/3499—Penetrating prong
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32008—Plural distinct articulation axes
    • Y10T403/32016—Three or more parallel axes
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32114—Articulated members including static joint
    • Y10T403/32122—Trunnion assembly to side of rod
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32114—Articulated members including static joint
    • Y10T403/32163—Articulate joint intermediate end joints
    • Y10T403/32172—Variable angle
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32114—Articulated members including static joint
    • Y10T403/32188—Angled or offset members
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32114—Articulated members including static joint
    • Y10T403/32213—Articulate joint is a swivel
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32606—Pivoted
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/36—Three or more serial joints, at least one diverse
    • Y10T403/364—Separable intermediate joint
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/49—Member deformed in situ
    • Y10T403/4941—Deformation occurs simultaneously with action of separate, diverse function, joint component
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/49—Member deformed in situ
    • Y10T403/4958—Separate deforming means remains with joint assembly
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/49—Member deformed in situ
    • Y10T403/4966—Deformation occurs simultaneously with assembly
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/57—Distinct end coupler

Definitions

  • This invention relates to improvements in scaffold devices, and is more particularly concerned with a scafiold assembly for use by home owners, owners of small industrial buildings and those who work on the exterior of small buildings.
  • Figure 1 is a fragmentary view of a portion of a scaffold assembly
  • Figure 2 is a top view of the particular clamp of the scaffold assembly according to the invention.
  • Figure 3 is a partly elevational and partly sectional view along lines 33 of Figure 2, and
  • Figure 4 is a partly elevational and partly sectional view along lines 4-4 of Figure 2.
  • the do it yourself type of scaffold assembly of the invention comprises cast or stamped parts which can be bolted or otherwise assembled to 2 by 4 inch or 4 by 4 inch lumber, which is usually readily available in most localities.
  • the side piece 7 is preferably a piece of 2 by 4 inch lumber of any desired length, which positions the front column from the rear column.
  • the end of the side piece 7 is affixed to the front column 5 by means of a two part C-clamp member D and D according to Figures 2, 3 and 4.
  • the front columns, which are preferably of a 4 by 4 inch lumber are clamped by the parts D and D according to Figure 2, which provides a through channel 10, protuberances 11, and bolts 12, 12 for this purpose.
  • the member D also includes a partially enclosed channel 13 for the reception of, and clamping of the side piece 7.
  • a clamp screw 14 serves the purpose of clamping the side piece 7. If two sets of front and rear columns are used, then four side support assemblies are required.
  • the clamp comprises first and second C-shaped clamp members D and D, gripping protuberances 11 on the inner surfaces A and B of members D and D respectively, bolts 12 connecting the C-shaped members to form the channel 10 therebetween, a rectangular frame D having parallel side walls 15 and 16 extending rearwardly of wall 17 of clamp member D and an end wall 18 connecting the walls 15 and 16 forming the rectangular frame D
  • the wall 18 extends upwardly of walls 15 and 16 forming a U-shaped seat for side piece 7.
  • a cross bracing support assembly is used.
  • This assembly consists of two cross members 17 and 18 which are centrally swivelly affixed at 19, and which preferably are of 2 by 4 inch lumber.
  • the cross members are attached at their ends to the front columns by a member E according to Figure l.
  • clamp members of the assembly can be stamped out of metal, e. g., aluminum, or can be cast out of metal.
  • a clamp means for holding cross members comprising first and second C-shaped clamp members, gripping means on inner surfaces of said clamp members, means for connecting said clamps to form a channel therebetween, an integral extension on one of said clamps and extending rearwardly therefrom, said extension comprising a rectangular frame having side walls extending rearwardly from said clamp and an end wall connecting said side walls, a U-shaped seat in said side walls and clamp screw operative through said rear wall.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Ladders (AREA)

Description

M r h'3, 1959 J. MCCORMICK 2,876,048
SCAFFOLD ASSEMBLY Fild July 20. 1954 FIG. I
INVENT OR JOHN McCORMICK ATTORNEY I United States SCAF FOLD ASSEMBLY John McCormick, Hillside, N. J., assignor of one-half to John Murnighan, Hillside, N. J.
Application July 20, 1954, Serial No. 444,417 1 Claim. (Cl. 304-40) This invention relates to improvements in scaffold devices, and is more particularly concerned with a scafiold assembly for use by home owners, owners of small industrial buildings and those who work on the exterior of small buildings.
Many types of scaifold devices have been devised previously which require the use of large parts diflicult for one man to handle. Also, various scaffold devices have been suggested for use by homeowners and the like, which are easily assembled by one man and stored for future use.
It is an object of this invention to provide a simple scaffold device which is easily assembled by one man. It is a further object of this invention to provide a do it yourself type of kit which the average homeowner can easily assemble into a scafiold for erection adjacent his home.
Other objects and advantages of this invention will become apparent to those skilled in the art from an examination of the following description and the accompanying drawings, forming a part thereof, and in which:
Figure 1 is a fragmentary view of a portion of a scaffold assembly,
Figure 2 is a top view of the particular clamp of the scaffold assembly according to the invention,
Figure 3 is a partly elevational and partly sectional view along lines 33 of Figure 2, and
Figure 4 is a partly elevational and partly sectional view along lines 4-4 of Figure 2. The do it yourself type of scaffold assembly of the invention comprises cast or stamped parts which can be bolted or otherwise assembled to 2 by 4 inch or 4 by 4 inch lumber, which is usually readily available in most localities.
Referring to Figure 6 are juxtapositioned 1, a pair of front columns and in front of the rear columns and are attached thereto by a side support assembly composed of members D and D, and a connecting side piece 7. The side piece 7 is preferably a piece of 2 by 4 inch lumber of any desired length, which positions the front column from the rear column. The end of the side piece 7 is affixed to the front column 5 by means of a two part C-clamp member D and D according to Figures 2, 3 and 4. The front columns, which are preferably of a 4 by 4 inch lumber are clamped by the parts D and D according to Figure 2, which provides a through channel 10, protuberances 11, and bolts 12, 12 for this purpose. The member D also includes a partially enclosed channel 13 for the reception of, and clamping of the side piece 7. A clamp screw 14 serves the purpose of clamping the side piece 7. If two sets of front and rear columns are used, then four side support assemblies are required.
In particular, the clamp comprises first and second C-shaped clamp members D and D, gripping protuberances 11 on the inner surfaces A and B of members D and D respectively, bolts 12 connecting the C-shaped members to form the channel 10 therebetween, a rectangular frame D having parallel side walls 15 and 16 extending rearwardly of wall 17 of clamp member D and an end wall 18 connecting the walls 15 and 16 forming the rectangular frame D The wall 18 extends upwardly of walls 15 and 16 forming a U-shaped seat for side piece 7.
In the event lengths of lumber are not available for the front columns in the size required then the proper length can be improvised by using splicer members F according to Figure 1.
To provide a cross bracing support for the front columns 5 and 6 a cross bracing support assembly is used. This assembly consists of two cross members 17 and 18 which are centrally swivelly affixed at 19, and which preferably are of 2 by 4 inch lumber. The cross members are attached at their ends to the front columns by a member E according to Figure l.
The clamp members of the assembly can be stamped out of metal, e. g., aluminum, or can be cast out of metal. Various modifications can be made in the parts shown and described herein which come Within the scope of the invention and it is intended that the invention be restricted only by the scope of the appended claim.
What I claim is:
In a scaffold assembly, a clamp means for holding cross members, the clamp means comprising first and second C-shaped clamp members, gripping means on inner surfaces of said clamp members, means for connecting said clamps to form a channel therebetween, an integral extension on one of said clamps and extending rearwardly therefrom, said extension comprising a rectangular frame having side walls extending rearwardly from said clamp and an end wall connecting said side walls, a U-shaped seat in said side walls and clamp screw operative through said rear wall.
References Cited in the file of this patent UNITED STATES PATENTS 353,281 Anderson Nov. 30, 1886 534,274 Massau Feb. 19, 1895 805,422 Hogan Nov. 21, 1905 1,007,759 Whitney Nov. 7, 1911 1,260,531 Fiala Mar. 26, 1918 1,636,930 Vila July 26, 1927 1,714,298 Davison May 21, 1929 1,848,085 Eisenschmidt Mar. 1, 1932 1,987,826 Heumann Jan. 15, 1935 2,187,642 Brown Jan. 16, 1940 2,365,501 Walstom Dec. 19, 1944 2,413,569 Isakson Dec. 31, 1946 FOREIGN PATENTS 20,652 Great Britain Nov. 15, 1900 33,175 France Aug. 18, 1928
US444417A 1954-07-20 1954-07-20 Scaffold assembly Expired - Lifetime US2876048A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490066A (en) * 1982-08-25 1984-12-25 Hanlon Jim C Clamping system for heavy "I" beams and the like on oil rigs, etc.
WO1989001082A1 (en) * 1987-07-27 1989-02-09 Gkn Kwikform Limited Beam scaffold structure
USD306690S (en) 1987-03-17 1990-03-20 Bison Jerome W Connector with pull pin

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US353281A (en) * 1886-11-30 Corner-clamp
US534274A (en) * 1895-02-19 Peter paul massau
GB190020652A (en) * 1900-11-15 1901-06-08 Heinrich Albin Roder Improvements in and relating to Scaffolding
US805422A (en) * 1905-06-09 1905-11-21 American Mfg & Novelty Co Ladder-foot clamp.
US1007759A (en) * 1909-11-22 1911-11-07 Egbert Whitney Wall-grip.
US1260531A (en) * 1916-06-06 1918-03-26 Joseph Fiala Jr Framing-clip.
US1636930A (en) * 1926-10-14 1927-07-26 Vila Alfonso Clamp for scaffolds
FR33175E (en) * 1927-03-18 1928-08-18 Telescopic trestle by wedging with adjustable feet
US1714298A (en) * 1927-10-17 1929-05-21 American Safety Device Co Framed structure and fitting therefor
US1848085A (en) * 1929-10-09 1932-03-01 Louis A Eisenschmidt Bracket
US1987826A (en) * 1931-08-01 1935-01-15 Heumann Gustav Show case clamp
US2187642A (en) * 1939-04-04 1940-01-16 All Scaffold Bracket Company D Bracket
US2365501A (en) * 1942-07-13 1944-12-19 Builders Safety Products Inc Builder's safety plate bracket unit
US2413569A (en) * 1945-05-29 1946-12-31 George W Schumacher Scaffolding device

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US353281A (en) * 1886-11-30 Corner-clamp
US534274A (en) * 1895-02-19 Peter paul massau
GB190020652A (en) * 1900-11-15 1901-06-08 Heinrich Albin Roder Improvements in and relating to Scaffolding
US805422A (en) * 1905-06-09 1905-11-21 American Mfg & Novelty Co Ladder-foot clamp.
US1007759A (en) * 1909-11-22 1911-11-07 Egbert Whitney Wall-grip.
US1260531A (en) * 1916-06-06 1918-03-26 Joseph Fiala Jr Framing-clip.
US1636930A (en) * 1926-10-14 1927-07-26 Vila Alfonso Clamp for scaffolds
FR33175E (en) * 1927-03-18 1928-08-18 Telescopic trestle by wedging with adjustable feet
US1714298A (en) * 1927-10-17 1929-05-21 American Safety Device Co Framed structure and fitting therefor
US1848085A (en) * 1929-10-09 1932-03-01 Louis A Eisenschmidt Bracket
US1987826A (en) * 1931-08-01 1935-01-15 Heumann Gustav Show case clamp
US2187642A (en) * 1939-04-04 1940-01-16 All Scaffold Bracket Company D Bracket
US2365501A (en) * 1942-07-13 1944-12-19 Builders Safety Products Inc Builder's safety plate bracket unit
US2413569A (en) * 1945-05-29 1946-12-31 George W Schumacher Scaffolding device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490066A (en) * 1982-08-25 1984-12-25 Hanlon Jim C Clamping system for heavy "I" beams and the like on oil rigs, etc.
USD306690S (en) 1987-03-17 1990-03-20 Bison Jerome W Connector with pull pin
WO1989001082A1 (en) * 1987-07-27 1989-02-09 Gkn Kwikform Limited Beam scaffold structure

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