GB1396190A - Method of stress-grading timber and apparatus therefor - Google Patents

Method of stress-grading timber and apparatus therefor

Info

Publication number
GB1396190A
GB1396190A GB5909272A GB5909272A GB1396190A GB 1396190 A GB1396190 A GB 1396190A GB 5909272 A GB5909272 A GB 5909272A GB 5909272 A GB5909272 A GB 5909272A GB 1396190 A GB1396190 A GB 1396190A
Authority
GB
United Kingdom
Prior art keywords
roller
timber
load
deflections
jaw
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
Application number
GB5909272A
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.)
South African Inventions Development Corp
Original Assignee
South African Inventions Development Corp
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 South African Inventions Development Corp filed Critical South African Inventions Development Corp
Publication of GB1396190A publication Critical patent/GB1396190A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/46—Wood

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

1396190 Testing & grading timber SOUTH AFRICAN INVENTIONS DEVELOPMENT CORP 21 Dec 1972 [23 Dec 1971] 59092/72 Heading G1S A rough sawn timber beam 10 is test loaded as at 16 by a pneumatically operated piston 24.1 which bears down on a roller 26 rotatably mounted in a vertically movable yoke 28. A deflection dial gauge 30 may be rotated by pulling down on an operating strip 32 depending between a pair of gripping jaws 34.1, 34.2 on a clamp 34. In operation, the jaw 34.2 is first closed upon the jaw 34.1 by downward pivoting of the lever 36 as the shoe 24.2 moves down to engage and pre-load the roller 26. Further movement downwardly of the shoe 24.2 then moves the roller 26 and the yoke 28 downwardly to apply a working load to the roller and timber beam and pull down on the strip 32. The cross-sectional dimensions of the beam 10 are then compared with the deflection obtained by applying a pre-load and then an increased working load, and these loads and deflections are then referred to a prepared table . of related loads, nominal and actual measurements and to deflections to determine the particular grade of the timber beam under test.
GB5909272A 1971-12-23 1972-12-21 Method of stress-grading timber and apparatus therefor Expired GB1396190A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA718601A ZA718601B (en) 1971-12-23 1971-12-23 Method of stress-grading timber,and apparatus therefor

Publications (1)

Publication Number Publication Date
GB1396190A true GB1396190A (en) 1975-06-04

Family

ID=25564296

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5909272A Expired GB1396190A (en) 1971-12-23 1972-12-21 Method of stress-grading timber and apparatus therefor

Country Status (2)

Country Link
GB (1) GB1396190A (en)
ZA (1) ZA718601B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2534376A1 (en) * 1982-10-08 1984-04-13 Layher Eberhard METHOD FOR DETERMINING THE LOAD CAPACITY OF COATING ELEMENTS FOR SCAFFOLDING, AND APPARATUS FOR IMPLEMENTING THE METHOD
GB2148517A (en) * 1983-10-21 1985-05-30 Ruth Langer Checking the loading capacity of flooring parts for scaffolding
WO2001038849A1 (en) * 1999-11-25 2001-05-31 Innovative Global Technology Limited Method and machine for grading timber elements
CN111272609A (en) * 2020-03-26 2020-06-12 西南林业大学 Method for grading structural specification sawn timber

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2534376A1 (en) * 1982-10-08 1984-04-13 Layher Eberhard METHOD FOR DETERMINING THE LOAD CAPACITY OF COATING ELEMENTS FOR SCAFFOLDING, AND APPARATUS FOR IMPLEMENTING THE METHOD
GB2148517A (en) * 1983-10-21 1985-05-30 Ruth Langer Checking the loading capacity of flooring parts for scaffolding
WO2001038849A1 (en) * 1999-11-25 2001-05-31 Innovative Global Technology Limited Method and machine for grading timber elements
CN111272609A (en) * 2020-03-26 2020-06-12 西南林业大学 Method for grading structural specification sawn timber

Also Published As

Publication number Publication date
ZA718601B (en) 1973-03-28

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees