US1461721A

US1461721A - Car roof

Info

Publication number: US1461721A
Application number: US572063A
Authority: US
Inventors: Bonsall Charles David
Original assignee: PH Murphy Co
Current assignee: PH Murphy Co
Priority date: 1922-06-30
Filing date: 1922-06-30
Publication date: 1923-07-17
Anticipated expiration: 1940-07-17

Description

July 17, 1923. A 1,463,721

c. D. BoNsALL CAR ROOF Filed June 30, 1922 2 Sheets-Sheet 2 Patented July 17, 1923.

CHARLES DAVID BONSALL, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO P. H. MURPHY COMPANY, OF NEW KENSINGTON, PENNSYLVANIA.

CAR ROOF.

Application filed .Tune 30, 1922.

To all whom it may concern.'

Be it known that I, CHARLES DAVID BoNsALL, a citizen of the United States, and a resident of the city of Pittsburgh, county of Allegheny, and State of Pennsylvania, have invented a certain new and useful Improvement in Car Roofs, of which the fol-f lowing is a specification.

My invention relates to car roofs o-f the all-steel riveted-up type wherein the roofing sheets extend from side plate to side plate and are rigidly secured thereto and to each other to form a rigid load sustaining structure.

Heretofore the side marginal portions of such roof sheets have been formed into ribs designed to act after the manner of carlines to increase the load carrying capacity of the roof and serve as frame members to brace and stiifen the car body. In actual practice, it has been found that such designs do not entirely eliminate the tendency of the sheets to buckle under stresses acting thereon when the car goes out of square. In actual practice, the effect of such buckling stresses become apparent in the region about midway between the ridge and eaves of the car.

The principal object of the present invention is to provide a cheap and lightweight roof of simple construction that will take care of the stresses that tend to buckle the sheets; and the invention consists principally in forming the ribs of two or more types arranged alternately and separately designed to better fit them for taking care of the contemplated stresses. The invention also consists in the parts and in the arrangements and combinations of parts hereinafter described and claimed.

In the accompanying drawings, which form part of this specification and wherein like symbols refer to like parts wherever they occur, U

Fig, l is a plan view of a portion of a car roof embodying my invention;

Fig. 2 is an enlarged transverse section through one-half of the car roof between stiffening ribs on the line 2--2 in Fig. l;

Fig. 3 is a similar section through a stiffening rib of one type on the line 3 3 in Fig. l;

Serial No. 572,063.

Fig. e is a similar section through a stiffening rib of the other type on the line 1l-4c in Fig. l;

Fig. 5 is a longitudinal section along the ridge line of the roof on the line 5 5 in Fig. 2;

Fig 6 is a similar section midway of the ridge and eaves on the line 6-6 in Fig. 2;

l Fig. 7 is a similar section adjacent to the side. plate on the line 7-7 in Fig. 2; and

Fig. 8 is a similar section through the goof at the side plate on the line 8--8 in The present roof comprises heavy gage roof sheets l0, which extend from eaves to eaves of the car and have depending dripflanges ll at their eaves ends. The roof sheets are supported on the outwardly projecting uppermost lianges of angle-bar side plates 12 and are suitably secured thereto by rivets 13. The side marginal portions of adjacent sheets are lapped and rigidly secured together by rivets 14. The side margin of each sheet is: pressed up on each side of the ridge to form ribs or seam flanges l5 that cooperate with like marginal lianges vor ribs of the next adjacent sheet to form hollow strengthening ribs A that extend inwardly from the side plates and terminate short of the ridge. The middle portion of each sheet is pressed up to form a hollow stiilening rib B which extends transversely of the car at the ridge and terminates short of the eaves.

The ribs of the type A alternate with those of the type B; and the ribs of both types vary in depth and are preferably of uniform width from end to end. The type A ribs are deepest adjacent to the eaves and decrease in depth towards the ridge and eaves. The portion of each type A rib located between its deepest point and the eaves is curved downwardly from said point and merges into the plane of the sheet where the eaves ends of the sheet is turned down to form the drip-flanges 1l; whereas, the portion located between the deepest point of said rib and the ridge gradually decreases in depth from said point towards the ridge and merges into the plane of the sheet on opposite sides of the ridge. The ribs of the type B have a maximum depth at the ridge i and gradually decreaseJ in depth to points adjacent to the eaves where they merge into the plane of the roof.

The pressed up side marginal ribs or flanges l5, which cooperate to form the type A ribs, are preferably of substantially inverted channel-shaped section. The type B ribs are also preferably of inverted channelshaped section and of a width corresponding to the Width ofthe type A ribs. The reverse taper of the carline ribs of the two types permits the use of a sheet blank having parallel sides, thereby eliminating the expense of shearing the sheet blank to a special shape before pressing; and the lateral flanges 16 that appear in the eaves sections of the lapped marginal ribs or ianges 15 of the roof sheets is the surplus of metal resulting from the down-turned eaves end portions of said iianges, which metal is turned outwardly to form said lateral flanges. The lateral flanges of each sheet are rigidly secured to the body portions of the next adjacent sheets by the rivets 13 that secure said sheets to the side plates. n

Running boards 17 extend longitudinally of the car at the ridge and are bolted to lthe upper most horizontal flanges of running board saddles 18. These saddles preferably rest on the overlapped side marginal portions of the roof sheets and have their lowermost lateral iianges rigidly secured thereto by the rivets 14 that secure said overlapped portions together.

It is noted that by alternating the type A ribs with the type B ribs, both types of ribs are present midway of the ridge and eaves and are well adapted to take care of the stresses that tend to buckle the sheets in this region. It is noted also that the roof as a whole is of more uniform strength for the reason that for all vertical longitudinal sections through the roof, the cross-sectional area of the metal in the sheets is the same. For this reason, the blank sheets from which the roof is made may be of rectangular shape and are adapted to be pressed-up without any shearing thereof.

Obviously my invention admits of considerable modification in the designs of the seams and ribs and in the alternations thereof and I do not wish to be limited to specific designs illustrated.

What I claim is:

1. A metal car roof comprising a series of transverse stiening ribs alternating with other stiii'ening ribs that are deepest adjacent to th@J eaves.

2. A metal car roof comprising a series of transverse stii'ening ribs, some of said ribs being deepest at the ridge and other of said ribs being deepest adjacent to the eaves.

3. A metal car roof comprising a series of transversestiiening ribs that are deepest of said ribs terminating short of the eaves Y and other of said ribs terminating short of the ridge.

7. A metal car roof comprising a series of transverse stiffening ribs having amaxinium depth intermediate their ends and terminating short of the eaves alternating withv other transverse stiffening ribs having a maximum depth intermediate their ends and terminating short of the ridge.

8. A metal car roof comprising a series of transverse stifi'ening ribs, some of said ribs being deepest at the ridge and merging into the plane of the roof adjacent to the eaves, and other of said ribs being deepest adjacent to the eaves and terminating short of the ridge.

9. A metal car roof comprising a series of transverse stili'ening ribs that are deepest at the ridge and merge into the plane of the roof adjacent to the eaves alternating with other transverse stiifening ribs that are deepest adjacent to the eaves and merge into the plane of the roof adjacent to the ridge.

10. A metal roof comprising a series of transverse ribs alternating with other transverse stii'ening ribs that extend inward from the eaves and terminate short of the ridge.

11. A metal car roof comprising a series of transversely alined stiii'ening ribs alternating with other transverse stiening ribs that extend inwardly from the eaves and terminate short of the ridge, and are deepest adjacent to the eaves and gradually decrease in depth towards the ridge.

12. A car roof comprising a plurality of roof sheets extending from eaves to eaves and having their side margins overlapped, said roof sheetshaving stifl'ening ribs formed in their overlapped portions that terminate short of the ridge and having stiffening ribs formed therein between their overlapped margins that terminate short of the eaves.

13. A car roof comprising a plurality of roof sheets extending from eaves to eaves and having their side margins overlapped and rigidly secured together, said roof sheets having stiffening ribs formed in their overlapped portions that are deepest adjacent to the eaves and merge into the plane of the roof at the eaves and short of the ridge.

14. A ear roof comprising a plurality of roof sheets extending from eaves to eaves and having their side margins overlapped, said roof sheets having stiffening ribs formed therein that extend transversely of the car between their overlapped margins and terminate short of the eaves and having stiifening ribs formed in their overlapped portions that terminate short of the ridge.

l5. A car roof comprising a plurality of metal roof sheets extending from eaves to eaves and having their side margins overlapped and rigidly secured together, each of said roof sheets having a stiifening rib formed thereon which extends transve-rsely of the car and is deepest at the ridge and merges into the plane of the sheet adjacent to the eaves, the overlapped margins of said sheets having stifl'ening ribs formed therein that are deepest adjacent to the eaves and merge into the plane of the sheets at the eaves and short of the ridge.

16. A car roof sheet having stiffening ribs formed therein, some of said ribs terminating short of the middle'of the sheet and other of said ribs terminating short of the ends thereof.

17. A car roo-f sheet having a stiifening rib formed therein that is deepest at the middle of the sheet and having a stiifening rib formed therein that is deepest adjacent to the eaves ends of said sheet.

18. A ear roof sheet having a stiffening rib formed therein that is deepest at the middle of the sheet and terminates short of the eaves ends thereof and having a stiftening rib formed therein that is deepest adjacent tothe eaves ends of said sheet and terminates short of the middle thereof.

19. A oar roof sheet having its side marginal portions and the portion therebetween formed with parallel stifi'ening ribs, the side marginal ribs extending inwardly from the eaves ends of the sheet and merging into the plane of the sheet at its eaves ends and short of its middle and the intermediate rib extending on opposite sides of the ridge portion of the sheet and terminating short of the eaves ends thereof.

20. A oar roof sheet having its side marginal portions and the portion therebetween formed with parallel stiflening ribs, the side marginal ribs being deepest adjacent to the eaves ends o-f the sheet and terminating short of the ridge and the intermediate rib being deepest at the ridge portion of the sheet and terminating short of the eaves ends thereof.

Signed at New Kensington, Pa., this 26th day of June 1922.

CHARLES DAVID BON SALL.