US3927732A

US3927732A - Scaffold

Info

Publication number: US3927732A
Application number: US456875A
Authority: US
Inventors: Takayuki Ooka; Shinji Aihara
Original assignee: Mitsui Engineering and Shipbuilding Co Ltd
Current assignee: Mitsui Engineering and Shipbuilding Co Ltd
Priority date: 1973-04-05
Filing date: 1974-04-01
Publication date: 1975-12-23
Anticipated expiration: 1992-12-23
Also published as: FR2224400A1; JPS5324080Y2; JPS49140899U; GB1465605A; DE2416476A1; FR2224400B1

Abstract

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.

Description

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.

Claims

1. 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 TRACK-ENGAGING 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 TRACK-ENGAGING MEANS WHEN SAID JACK MEANS IS HORIZONTAL.