US3810704A - Scaffold tube coupler - Google Patents

Scaffold tube coupler Download PDF

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Publication number
US3810704A
US3810704A US00276011A US27601172A US3810704A US 3810704 A US3810704 A US 3810704A US 00276011 A US00276011 A US 00276011A US 27601172 A US27601172 A US 27601172A US 3810704 A US3810704 A US 3810704A
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US
United States
Prior art keywords
jaw
lugs
tube
free end
bolt
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
US00276011A
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English (en)
Inventor
J Lowe
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.)
Burton Delingpole and Co Ltd
Original Assignee
Burton Delingpole and Co Ltd
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 Burton Delingpole and Co Ltd filed Critical Burton Delingpole and Co Ltd
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Publication of US3810704A publication Critical patent/US3810704A/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
    • E04G7/06—Stiff scaffolding clamps for connecting scaffold members of common shape
    • E04G7/12—Clamps or clips for crossing members
    • E04G7/14—Clamps or clips for crossing members for clamping the members independently
    • 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
    • Y10T403/71—Rod side to plate or side
    • Y10T403/7105—Connected by double clamp

Definitions

  • ABSTRACT A coupler for connecting a pair of round scaffold tubes, embodying hinged tube clamping jaws having limited opening movement but exceeding 90 such as to allow lateral initial positioning of the scaffold tube passed the clamping bolt.
  • This invention relates to couplers for connecting two round scaffold tubes together and of the kind, herein called the. kind specified, which comprises a central body formed as a metal drop forging having on each of two opposite sides thereof a tube receiving seating, the seatings being so relatively disposed that the two tubes are connected together in mutually perpendicular relationship, the body at each of two opposite sides thereof adjacent each seating being provided with a pair of binge lugs formed integrally with the central body during the drop forging operation,.so that each of the four lugs embody substantially the same mass of metal, one of the two lugs of each pair having hinged thereto one end of one of two tube securing jaws each formed to provide a tube receiving recess, and the other of the two lugs of each pair having hinged thereto a clamping bolt arranged for detachable clamping engagement with the other and free end of one
  • each jaw hinging lug is chamfered at a position and to an extent such as to allow the associated jawto swing outwardly away.
  • each jaw hinging lug adjacent its junction with the central body having its cross section increased and thus strengthened against bending by a mass of metal substantially equal to that saved by the said chamfering, so as to maintain substantially the same mass of metal in each of-the four lugs of the body.
  • This last'mentioned feature facilitates the drop forging of each body with the maximum economy of metal and enables two such bodies to be simultaneously drop forged on a forging press of a size such as to be capable of forging only one body at a time in the case where there is substantial difference in the mass of metal in each of the four lugs.
  • each stop forming lug is such that the spacing between the free end of the fully open jaw and the free end of the associated bolt when in the free position is less than the peripheral diameter of the round horizontal tube, but large enough to allow the convexedly curved upward directed periphery of the round horizontal tube by its engagement with the free end of the bolt to urge the latter upwardly about its hinge as the horizontal tube is displaced transversely of its length towards the coupler body.
  • Such an arrangement avoids providing such a large opening movement of the jaw as to render it less effective in supporting the horizontal tube before this is finally clamped into position.
  • the'opening angular movement of each jaw need be no more than about l00 to 1 10 as opposed to the hitherto customary substantially 90.
  • FIG. 1 is a side elevation partly in section of one form of hitherto used coupler of the kind specified.
  • FIG. 2 is a view similar to FIG. 1 but depicting the coupler of this invention.
  • the coupling there illustrated is intended for use in connecting two scaffold tubes together, in fixed mutually perpendicular relationship and comprises a central body 9 embodying in each of its two sides two mutually perpendicular concave seatings 10, 11 so as to be adapted to extend between the two scaffold tubes.
  • a central body 9 embodying in each of its two sides two mutually perpendicular concave seatings 10, 11 so as to be adapted to extend between the two scaffold tubes.
  • the coupling there illustrated is intended for use in connecting two scaffold tubes together, in fixed mutually perpendicular relationship and comprises a central body 9 embodying in each of its two sides two mutually perpendicular concave seatings 10, 11 so as to be adapted to extend between the two scaffold tubes.
  • FIG. 1 only the one concave seating 11 and its associated lugs are seen fully in side elevation but it will be readily understood by those familiar with this kind of cover that the other concave seating and its associated lugs have the same formation as those described with reference to the concave seating 11.
  • the body at the periphery thereof has integrally formed therewith, two mutually transverse pairs of lugs 12, 13, and 14, (the other one not being seen), with the two lugs in each pair disposed at diametrically opposite sides of the central body 9.
  • One of the lugs l2, 14, in each pair and which constitute jaw hinging lugs is devoid of oppositely extending flanges so as to be of substantially rectangular form in cross section, and the other lug 13, 15 of each pair is formed in one side with an open-mouthed recess 16 of shallow depth e.g. about 5 mms.
  • each recess 16 is elongated in a direction parallel to the hinge axis ofthe diametrically opposite jaw hinging lug 12, 14, so as to accommodate the bolt head 17.
  • the bolt head receiving recess 16 of each of the bolt hinging lugs 13, 15 has its two opposite elongated sides 16a relatively inclined towards one another in a direction inwardly of the mouth 16b of the recess.
  • the mouth 16b of each recess 16 has a width which is substantially equal to the length ofthe elongated bolt head 17.
  • the relative inclination of the two recess sides 16a in a direction inwardly of the recess mouth 16b is such, that with the bolt partially withdrawn from its associated recess 16 with its stem 18a extending substantially vertically in a downward direction from the head 17 and with the latter disposed substantially at right angles to the length of the elongated recess 16, if the coupler is now manually shaken, the resultant reaction between at least one ofsaid two inclined recessed sides 16a and the adjacent end of the bolt head causes the latter to turn about the axis of stem 18a so as to allow the bolt head, under the weight of the bolt, to drop downwardly into its correct position within the recess 16 as depicted in FIG. 2.
  • the bolt head can readily be displaced from a position in which it fouls and thus interferes with the positioning of the adjacent scaffold tube.
  • each bolt hinging lug 13 embodies substantially the same mass of metal as that embodied in the jaw hinging lugs l2, l4, i.e. the mass of metal in each of the two diametrically opposed lugs in each pair of lugs is substantially the same.
  • the periphery of the body 9 is devoid of projecting corners at positions intermediate the positions of the four lugs, three of which are seen at l2, l3, 14.
  • the body 9 is not of the hitherto rectangular configuration peripherally involving intermediate the said lugs, projecting corners which are wasteful in metal.
  • Each recessed lug 13 is formed with an elongated hole through which the stem 18a of the respective clamping bolt 18 passes.
  • the free end portion of the clamping bolt carries a nut 20 for engaging with the free end portion 21 of one of a pair of clamping jaws 22, 23, the other end portion 24 of each of which jaws is hinged by pin 25, one to each of the substantially rectangular section lugs 12, 14.
  • each pin 25 provides a hinge bearing for the corresponding jaw.
  • Each jaw 22, 23 has a concavedly curved tube engaging recess 22a, 23a respectively.
  • each elongated hole in the recess 16 i.e. in a direction transverse to the length of the bolt stem 18a, is such as to permit of the bolt being pivoted into a fully disengaged position shown at 18' in FIG. 2 in which the bolt is well clear of the free end 21 of the associated jaw when the latter is still in clamping position relative to the scaffold tube facilitating the removal of the associated scaffold tube.
  • each hole is however such as to prevent the bolt 18 under its own weight pivoting downwardly beyond the free position depicted in full outline in FIG. 2 for the reason explained later herein.
  • the central body 9 is formed integrally during the forging thereof, with two pairs of lug reinforcing portions two of which are seen at 120, 13a, each extending from the central body 9 adjacent the two pairs of lugs three of which are seen at l2, l3, 14, respectively and in the direction in which the respective adjacent lug extends from the central body.
  • the bar is then severed into separate portions, so as to embody two cylindrical parts connected by the aforementioned rectangular portion which in the preliminary swaging operation is formed to a length great enough to provide therein sufficient metal to form two of said bolt hinging lugs each associated with a respective one of the two central bodies 9.
  • This severed length of bar is then placed in a known form of forging press, or a drop forging hammer, but provided with two pairs of forging dies arranged and shaped, to forge at one and the same time, two connected together central bodies 9, with one of the two hinging lug forming parts of the two forging dies of one pair being aligned with and adjacent to a corresponding part of the other pair of dies.
  • the bar is forged by a succession of blows, of the press or hammer to the configuration substantially that of two of the central bodies 9.
  • FIG. I depicts one form of hitherto used coupler of the kind specified.
  • each jaw 22, 23 is forked so that the arms 26 of the fork extend on opposite sides of the corresponding lug 12, I4, and the free end 27 of each of these lugs l2, 14 is adapted as shown in FIG. 1 to engage with the metal of the jaw at a position 28 between the inner ends of the two arms 26 to provide a stop to limit the opening movement of each jaw 22, 23.
  • This latter feature is of practical importance in that with the jaw 22 of one half of the coupling secured first, as is customary, to a vertically extending, i.e. upright, tube 29, forming one of the two tubes to be connected, then as shown in FIG. 1, the jaw 23 of the other half of the coupling can be supported in a horizontal position to provide a rest for a horizontal tube 30, namely the other tribe to be connected, before this is finally clamped by such jaw 23 in position.
  • each jaw hinging lug I2, I4 is however such that as shown in FIG. I each jaw, i.e., the depicted open jaw 23 can only be swung downwardly through an angular distance of substantially 90 from its tube clamping position.
  • this horizontal tube supporting position the minimum distance between the free end portion 21 ofjaw 23 and the free end of the associated bolt 18 when in the full outline free position is so much less than the outside diameter of the tube 30, that the bolt extends substantially radially in relation to the centre of the tube 30 when an attempt is made to advance the tube transversely of its length into a position for being received within seating 230.
  • the foregoing is illustrated by the position 30' then occupied by the tube 30 the side of which that is nearest to the vertical tube and coupler body is in abutting engagement with the end face of either the bolt or nut thereon.
  • tube 30 can be advanced into a position for being supported by open jaw 23 if bolt 18 is grasped by one hand of the operator and swung upwardly from the depicted full outline position.
  • each of these lugs l2, 14 is two arms 26 to provide astop to limit the opening movement of each jaw 22, 23.
  • each of the two jaw hinging lugs l2, 14 is chamfered at 27a as compared with the configuration of the free end 27 of each of these two lugs in the previously used coupler depicted in FIG. 1.
  • the extent of the chamfering is such as to permit of each jaw, i.e.
  • the minimum distance between the free end portion 21 of jaw 23 and the free end of the associated bolt 18 when in the free position shown in full outline in the drawings, although still less than the outside diameter of the tube 30, is large enough to allow the convexedly curved upwardly directed periphery of the round horizontal tube by its engagement with the free end of the bolt to urge the latter upwardly about its hinge as the horizontal tube is displaced transversely of its length towards the coupler body.
  • the foregoing is illustrated in FIG. 2 by the position 30' occupied by the tube 30 when advanced in a direction transversely of its length between the free end of the bolt and the free end portion 21 of the jaw 23 in the supporting position.
  • each jaw hinging lug l2, 14 is maintained the same as that in each bolt hinging lug 13, despite the removal of metal by the abovementioned chamfering 270. This is done by increasing the thickness of each of the lugs l2, 14 in a direction perpendicular to the axis ofjaw hinge pin 25 at a position between the latter and the body 9.
  • each lug 12,,14 directed away from the associated seating 11, 10 respectively is rectilinear instead of being concave as in the previously used construction of FIG. 1.
  • each lug l2, 14 is strengthened at a position between the pin 25 and the junction of the lug with the central body, which is an important advantage in that the jaw hinging lugs are subjected to a very high tensile load when the clamping bolts are tightened.
  • the aforementioned lug reinforcing portions 12a are made more effective in strenghening their respective associated lugs l2, l4.
  • each jaw which is forked to receive the stem 18a of the bolt, may have a width slightly greater than that of the remainder of the jaw, so as to permit of the two arms of such forked end to be formed with upstanding arcuate shaped flanges which flanges, with the clamping nut 20 tightened, engage with the cylindrical base of the nut at the side thereof furthest from the associated jaw hinge, thus more securely retaining the nut in clamping engagement with the free end 21 of the jaw.
  • a coupler for connecting two round scaffold tubes together and of the kind which comprises a central body formed as a metal drop forging having on each of two opposite sides thereof a tube receiving seating, the seatings being so relatively disposed that the two tubes are connected together in mutually perpendicular relationship, the body at each of two opposite sides thereof adjacent each seating being provided with a pair of hinge lugs formed integrally with the central body during the drop forging operation, so that each of the four lugs embody substantially the same mass of metal, one of the two lugs of each pair having hinged thereto one end of one of two tube securing jaws each formed to provide a tube receiving recess, and the other of the two lugs of each pair having hinged thereto a clamping bolt arranged for detachable clamping engagement with the other and free end of one of the two jaws, each clamping bolt being adapted to hinge under its own weight towards its associated jaw when the latter is at a horizontal level which is below that of the bolt, means being provided for limiting such hinging movement of each clamp
  • a coupler according to claim 1 characterized in that the maximum opening angular movement of each jaw does not exceed a value within the range of to

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
US00276011A 1971-07-30 1972-07-28 Scaffold tube coupler Expired - Lifetime US3810704A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3585071A GB1393095A (en) 1971-07-30 1971-07-30 Scaffold tube coupler

Publications (1)

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US3810704A true US3810704A (en) 1974-05-14

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US00276011A Expired - Lifetime US3810704A (en) 1971-07-30 1972-07-28 Scaffold tube coupler

Country Status (9)

Country Link
US (1) US3810704A (es)
AU (1) AU452990B2 (es)
BE (1) BE786917A (es)
CA (1) CA965457A (es)
DE (1) DE2237987A1 (es)
ES (1) ES405365A1 (es)
FR (1) FR2149127A5 (es)
GB (1) GB1393095A (es)
IT (1) IT972432B (es)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4355922A (en) * 1979-02-23 1982-10-26 Masataro Sato Metal clamp for scaffolding, temporary building and the like
DE4439430A1 (de) * 1994-11-04 1996-05-09 Langer Ruth Geb Layher Gerüstkupplung
US5641173A (en) * 1995-04-20 1997-06-24 Cobb, Jr.; William T. Cycling trailer
US20120219354A1 (en) * 2011-02-24 2012-08-30 Bauer Ryan E Cup-lock coupler clamp for detachably attaching at any elevation on a vertical tube of the cup-lock scaffold system
US20210047847A1 (en) * 2018-04-25 2021-02-18 Scaffold Safety Innovations Ltd Scaffolding systems and a scaffolding joint therefor
US11208815B2 (en) * 2018-06-01 2021-12-28 At-Pac China Business Trust Scaffold ledger

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT211213Z2 (it) * 1987-03-18 1989-02-13 Guzzini Illuminazione Gruppo di giunzione per la composizione di strutture tubolari di supporto di gruppi illuminta.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB447865A (en) * 1935-01-12 1936-05-27 Francois Cementation Co Ltd Improvements in or relating to couplings or clamps for connecting together bars, tubes, and other structural members for scaffolding or other purposes
US3512814A (en) * 1966-12-06 1970-05-19 Burton Delingpole & Co Ltd Scaffold couplings

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB447865A (en) * 1935-01-12 1936-05-27 Francois Cementation Co Ltd Improvements in or relating to couplings or clamps for connecting together bars, tubes, and other structural members for scaffolding or other purposes
US3512814A (en) * 1966-12-06 1970-05-19 Burton Delingpole & Co Ltd Scaffold couplings

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4355922A (en) * 1979-02-23 1982-10-26 Masataro Sato Metal clamp for scaffolding, temporary building and the like
DE4439430A1 (de) * 1994-11-04 1996-05-09 Langer Ruth Geb Layher Gerüstkupplung
US5641173A (en) * 1995-04-20 1997-06-24 Cobb, Jr.; William T. Cycling trailer
US20120219354A1 (en) * 2011-02-24 2012-08-30 Bauer Ryan E Cup-lock coupler clamp for detachably attaching at any elevation on a vertical tube of the cup-lock scaffold system
US20210047847A1 (en) * 2018-04-25 2021-02-18 Scaffold Safety Innovations Ltd Scaffolding systems and a scaffolding joint therefor
US12116793B2 (en) * 2018-04-25 2024-10-15 Scaffold Safety Innovations Ltd Scaffolding systems and a scaffolding joint therefor
US11208815B2 (en) * 2018-06-01 2021-12-28 At-Pac China Business Trust Scaffold ledger

Also Published As

Publication number Publication date
GB1393095A (en) 1975-05-07
AU4511672A (en) 1974-01-31
DE2237987A1 (de) 1973-02-08
BE786917A (fr) 1972-11-16
ES405365A1 (es) 1975-07-01
AU452990B2 (en) 1974-09-19
CA965457A (en) 1975-04-01
FR2149127A5 (es) 1973-03-23
IT972432B (it) 1974-05-20

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