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Publication numberUS3927732 A
Publication typeGrant
Publication dateDec 23, 1975
Filing dateApr 1, 1974
Priority dateApr 5, 1973
Also published asDE2416476A1
Publication numberUS 3927732 A, US 3927732A, US-A-3927732, US3927732 A, US3927732A
InventorsAihara Shinji, Ooka Takayuki
Original AssigneeMitsui Shipbuilding Eng
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 3927732 A
A scaffold is provided on a top of the jack, which in turn is provided on the truck to be laid on the truck, so that the truck can be moved to the adjacent divisions passing through the man hole of the divisional bulkhead.
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Description  (OCR text may contain errors)

United States Patent Ooka et al. Dec. 23, 1975 SCAFFOLD [56] References Cited [75] Inventors: Takayuki Ooka, Ichihara; Shinji UNITED STATES PATENTS Aihara, Osaka, both of Japan 710,069 9/1902 Nickerson 182/63 713,911 11/1902 McPartland 182/63 [73] Asslgnees' shlpbu'ldmg and Engmeerng 3,596,976 8/1971 Eitel 182/2 Tokyo; Osaka Jack 3,747,957 7/1973 N011 182/2 Co., Ltd., Osaka, both of Japan 22 F1 d A l 1974 FOREIGN PATENTS OR APPLICATIONS 1 414,161 8/1934 United Kingdom 182/63 [21] Appl. No.: 456,875

Primary ExaminerReinaldo P. Machado [30] Foreign Application Priority Data Attorney, Agent, or FirmI-Iowson and I-Iowson Apr. 5, 1973 Japan 48-41274[U] 5 ABSTRACT A scaffold is rovided on a to of the 'ac-k which in 52 U. P P 1 S Cl 182/36 182/63 turn is provlded on the truck to be laid on the truck, [51] hm Cl 2 E04; U22 so that the truck can be moved to the adjacent divi- [58] Field 2 36 152 sions passing through the man hole of the divisional 212/8 R, 17, 46 R, 55, 58 R bulkhead.

1 Claim, 3 Drawing Figures Dec. 23, 1975 Sheet 1 of 2 3,927,732

U.S. Patent Sheet 2 of 2 3,927,732

US. Patent Dec. 23, 1975 SCAFFOLD The present invention relates to a scaffold and more particularly to a scaffold suitable for fillet welding of cross plates in shipbuilding.

In welding of the bottom transverse and longitudinal bulkhead in the center tank of a tanker, for example, scaffolds are provided by welding and fastening of bolts and nuts. These workings must be manually performed. Further, the scaffolds must be provided at every welding positions.

Therefore, the object of the present invention is to provide a scaffold by which working may be efficiently and safely performed. In accordance with the present invention, the scaffold can be passed through the man hole of the bulkhead and erected for working in the high position.

In the drawings:

FIG. 1 is a front view of a scaffold according to the present invention;

FIG. 2 is a plan view of the scaffold; and

FIG. 3 is a perspective view. 4

Referring to the drawings, 1 is a truck on which a pair of telescopic jacks 2 and 2 are provided. Each jack 2 is pivotally mounted on the horizontal axis having a right angle with the moving direction of the truck 1 and is adapted to be rotated by an oil hydraulic cylinder 3 between the erected position and the laid position parallel to the moving direction. On the side of the jack 2, wheels 4 are provided so that they may be engaged with rails 5 when the jack is laid. A turn table 7 is rotatably provided on the top of the jack post 6 and is adapted to be rotated by the oil hydraulic cylinder 8. On the turn table 7, a telescopic scaffold 10 is provided to be rotated about the horizontal shaft, of which scaffold 11 is slidably provided to be projected from either side of the scaffold 10. The scaffold 10 can be rotated by the oil hydraulic cylinder 12 so that the scaffold may be folded. The railing 13 may be also folded. The jack 2 is further provided with a foldable scaffold l4 and the truck 1 is provided with the oil pump 15.

In operation, FIG. 3 shows the condition that the scaffold according to the present invention is located in the position suitable for welding the bottom transverse l6 and the longitudinal bulkhead 17. In this position, the electromagnet 18 provided on the jack post is attracted to the longitudinal bulkhead 17, so that the jack is securely held in the erected position. When the scaffold is moved to the adjacent division, the scaffold and jack are folded and the truck is moved to the adjacent division passing through the man hole 16a.

In accordance with the present invention, since the jack can be folded, it can be moved to adjacent divisions passing through the man hole of the divisional bulkhead. Therefore welding work may be efficiently and safely performed.

What is claimed is:

l. A movable scaffold system, comprising:

' a movable supporting truck having a flat truck bed; telescopic jack means having a lower section and at least one upper section, said lower section being pivotably mounted on said truck bed for pivoting about a horizontal axis between an upright position and a horizontal position, and erecting means on said bed for controlling said pivoting, said at least one upper section being telescopable into said lower section and said lower section having trackengaging means secured to said lower section for supporting said lower section on a track when said truck is moved along said track; said jack means in its horizontal position lying along said bed with its upper side extending to a height no greater than that of the highest part of the remainder of said system not supported on said jack means, and having an overhanging portion extending beyond an end of said truck; and foldable scaffold means mounted to said upper section of said jack means and pivotable between a horizontal position when said jack means is upright and a folded horizontal position beneath said overhanging portion of said jack means and between said trackengaging means when said jack means is horizontal.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US710069 *Jul 6, 1901Sep 30, 1902Walter A NickersonFire-extinguishing and life-saving apparatus.
US713911 *Apr 5, 1901Nov 18, 1902James H McpartlandFire-escape with water-tower attachment.
US3596976 *May 9, 1969Aug 3, 1971Gen Cable CorpVehicle construction for use with aerial lift
US3747957 *Apr 29, 1971Jul 24, 1973Koehring CoCrane boom load transfer dolly
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4088200 *Nov 11, 1976May 9, 1978John Laing And Son LimitedLifting apparatus
US4498556 *Feb 15, 1983Feb 12, 1985Access Engineering Ltd.Vertically movable, road towable work platform
US4589520 *Jan 6, 1983May 20, 1986Tapfer David LPlatform service vehicle
US4630708 *Jan 29, 1986Dec 23, 1986Thompson George JSemi-adjustable service platform apparatus for gantry crane
US4944366 *Feb 6, 1989Jul 31, 1990D. L. Pryor & Sons, Inc.Pneumatically operated scaffolding
US5152370 *Jan 14, 1991Oct 6, 1992Silberman Cyril JBridge docking structure for aircraft
US5318149 *Mar 23, 1990Jun 7, 1994Alfons MoogApparatus for inspecting the underside of bridges
US5375283 *Apr 26, 1993Dec 27, 1994Silberman; Cyril J.Bridge docking structure for aircraft
US5381575 *Nov 1, 1991Jan 17, 1995Silberman; Cyril J.Bridge docking structure for aircraft
US5425213 *Jun 16, 1993Jun 20, 1995Kabushikigaisha KoaApparatus and method for uprightly securing steel frame posts
US5573080 *Jan 9, 1995Nov 12, 1996Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H.Work car
US7607513 *Oct 27, 2009Elmo RojasTelescoping lifting hand truck with a folding platform
US20090078502 *Sep 22, 2008Mar 26, 2009Frank KnurrMovable work platform
US20130153336 *Dec 6, 2012Jun 20, 2013Lili WuPersonnel lift vehicle
US20130186708 *Feb 6, 2013Jul 25, 2013Lili WuPersonnel lift vehicle
USD730614Nov 26, 2013May 26, 2015Big Lift, Llc.Personnel lift vehicle
WO1999013184A1 *Jun 9, 1998Mar 18, 1999Jlg Industries, Inc.Extendible platform arrangements for personnel lifts
U.S. Classification182/36, 182/69.4, 182/62.5, 182/152
International ClassificationE04G1/18, B66F11/04, B63B9/00, E04G1/22
Cooperative ClassificationB66F11/04
European ClassificationB66F11/04