US1866539A - Car roof - Google Patents

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US1866539A
US1866539A US546770A US54677031A US1866539A US 1866539 A US1866539 A US 1866539A US 546770 A US546770 A US 546770A US 54677031 A US54677031 A US 54677031A US 1866539 A US1866539 A US 1866539A
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ridge
plates
roof
secured
hanger
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US546770A
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Bonsall Charles David
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PH Murphy Co
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PH Murphy Co
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B61RAILWAYS
    • B61DBODY DETAILS OR KINDS OF RAILWAY VEHICLES
    • B61D47/00Loading or unloading devices combined with vehicles, e.g. loading platforms, doors convertible into loading and unloading ramps

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  • This invention relates to car'roofs, particularlyinsulated car roofs of the type shownin my Patent No. 1,643,975, dated August- 4, 1927, wherein self-supporting roof sheets extend from side'to side of the cark and are rigidly connected along their adjacent mar- ⁇ gins by upstanding seams that function as outside carlines vand have lmembers secured therein'for stiflening said seams and for suspendingI the insulating lining beneath said roof sheets.
  • Iheprincipal object of the present invention is to provide a simple and parrangement for attaching aload-l'ifting beam to roofs of the above type.
  • Other objects arel ease' of assembly, compactnessof design, fewi ness of parts and cheapness of manufacture;
  • Fig. 5 is a similar section taken ,intermediate between the ridge and'the'eaves on the line 5-5in Fig. 3.
  • Y 1 Y Fig. 6 is a plan view of'one of the hanger brackets which connect. the ridge ends of the v combined seams stiffeners and lining sup-V ports. and which also support the lifting beam.
  • "u' 'f'zV i ⁇ F ig. 7 is a fragmentary section similar to Fig. 3' showing a lifting beam ofmodiied construction; and
  • the roof sheets are provided along their adja- ⁇ cent side 'margins with upstanding seam KENSINGTON, PENNSYLVANIA, Al coItroRATIoNor' 1931. seriaiNo. 546,770.
  • Fig. 8 isa vertical section online 8-'8 in f.
  • my invention is shown in connectionv with an all-steel riveted-up car roofl comprising metal roof sheets l, whichl extend from side plate 2 vto side plate 2alongsid ⁇ e of'each other' and "slope downwardly' on opposite sides of the Y ridge to formapitch or arcuate roof.
  • the side plates 2 y are preferably of Z-shaped cross-section and arek positioned with their .webs .horizontal Aand with their inner flanges 3 extending upwardj ly.
  • the roof sheets-l are supported on and angle strips 4, which extend longitudinally of the carv with their other flanges proj ecting' downwardly and riveted flatw'ise to the outer faces of the upstanding inner flanges 3 of the side plates 2.
  • the roof sheets l are provided attheir eaves ends with depending drip flanges 5 that overhangthe outer edges of the eaves angles 4:.
  • a -v Y Metal strips or plates f8.1of substantially angular cross-.section haveioneflange interposed between the adjacent side seam flanges c 6 of Vadjacent roof sheets, the 'otheriiange extending ⁇ beneath the subjectsed sideV marginal panel 7 of one roof sheet and: being'spacedl jvertically therefrom.
  • Metal seamcaps 9 of substantially inverted U-shapedcrossfsection nef are placed astride adjacent side marginal seamflanges :6 andthe ,vertical flange of the strip 8 interposed therebetweenand are rivetl ed or otherwise'rig-idly securedfto saifd flanges to form an yupstandingl seamgconst'ruction that functions after-'the manner of 'an eX-V terior'carline for the roof.
  • vwooden strips 13 that ext-end longitudinally of said plates from the side plates to points short of the ridge ends of said plates.
  • Each wooden strip 13 is rabbetedas at 14, along one of its upper corners to accommodate the baseflange of the seam plate 8 to which it is secured; andthe portion of said strip located on the side opposite fromsaid base .flange is preferably in contact with the raised side marginal roof sheet panel 7 located thereabove.
  • aninsulating lining 15 of wood or other insulating material which is nailed or otherwise rigidly secured to the undersides ofY said strips.
  • the wooden strips 13 serve as nailing strips for the insulatinglining 15, and they also serve to space the saidy lining below the roof sheets V,and thus provide dead airV insulating spaces between the roof sheets and lsaid linings.
  • each seam for carline construction is connected together by means ofiasplice member lthat serves as a hanger for aload-v lifting beam 17 which extends longitudinally of thereof at the ridge, preferablyfrom-end to end of the car.
  • Each of these combined splice members and beam hangers 16 comprises a channel-shaped body portion with outstanding top flanges 18 that are bolted or otherwise rigidly secured tothe bottoms of the ridge end portions of the base flanges of the two combinedhanger and Stiening plates 8 foreach seam. T he channel-shaped beam hanger 16 is locatedbetween the spaced ridge a ends.
  • the load-liftingbeam 117 is shown inthe form of a metal member of inverted Vchannel-shapedY cross-section with outstanding base flanges19.
  • the web or top portion of the invertedchannelshaped load-lifting beam 17 is riveted or otherwise secured flatwise tothe bottom of the web-of the channelshaped beam hanger 16, with the upper por- 20'which is'slidably supportedon ⁇ said flangesv and serves to support a suitable lifting tackle (not shown).
  • the roof is shown provided with asectional or built-up load-lifting beam 21 of channelshaped section with lateral top flanges 22 that are. bolted or otherwise rigidly secured directly to the bottoms of the ridge end portions of the base flanges of the plates 8 for each seam ,5 and thebottom or web of the channel is provided with a longitudinal slot 23 adapted to slidably receive a ring 24 for'supportingl a lifting tackle (not shown).
  • the ring-24 is 'slidably supported in the slot 23 by means of-laterally extending portions 25 at the top of said ring.
  • the load-lifting beam 21 preferably comprises two side members or sections 26 kof Substantially Zv-shaped crosssection that are so arranged that their 'webs form the sides of the channel, theirY upper Y flanges formthe top flanges 22of said channel and their bottom'flanges form the slotted bottom of said channel.
  • a Car roof comprising roof sheets coney iiected by upstanding. seams, plates embodied and rigidly secured to the seam plates and to in said seams, a load-lifting beam extending longitudinally of the car beneath said plates, and hangers for said beam, each ofsaid hangers comprising a member interposed between said beam.
  • a car roof comprising roof sheetsconnected by seams, plates embodied in said seams, a load-lifting beam located beneath said roof sheets, and a hanger for lsecuring said beam to the plates of each of said seams, said hanger comprising aV channel-shaped member securedto the top of Vsaid beam and having outstanding top flanges that are secured to the adjacent ends of the plates embodied in said seam.
  • A- car roof comprising roof sheets connected by upstanding seams, plates embodied in said seams and extending substantially from eaves to ridge of thereof, a load-lifting beam extending longitudinally ofthe car beneath the roof, and hangers for said beam,
  • each of said hangers comprising a channel' a load-lifting beam extending longitudinallyj of" the-roof 'a'ii'd rgidly connected tothe l ridge end portions of the plates of the several pairs w 1 0.' 'Ina cai" roof, hanger Vplates embodied'V in said roof and extending transversely theres of substantially from eavesto ridge inipairs, a loadelifting beam extending'longitudinally-ofthe roofI and rigidly connected to the ,ridge end portions of the plates of the several pairs, and an insulating lining for said roof,
  • said insulatingilining being secured'to saidV hanger plates and extending' from opposite V I sides of-said beam at .the .level thereof-.substantially to the eaves of the roof.”
  • hanger plates embodied .in saidro'of and extending transverselythere-,V l
  • said load-lifting beam extending'longitudinally of the roof and connecting the adjacent ridg'eend portions of said plates, said load-lifting beam comprising '-shaped ⁇ sections arranged to ⁇ forma channel with outstanding top flanges,
  • l Y y, 'A car roof comprising roofisheets con* nected byseams,hanger plates embodied in ioo said seams extending substantially from ridge Yto eaves, nailing strips secured to 'said' hanger vplates and terminating short ofthe ridge', 'an insulating. lining secured toisaid nailing strips and also terminatingshort of the ridge, and
  • a car roof comprisingroof sheets con.-
  • hanger plates embodied in said seams extending substantially from ridge to eaves, nailing strips secured to said lhanger plates and' terminating short ofthe ridge,5aninsul'ating lining secured to said nailing strips and also terminati'ng'short ofvr the ridge, la load-lifting beam ⁇ construction located between the spaced ridgeends of said i nailing strips and said lining and connecting VVthe ridge ends of said hanger plates, said loadlifting beam construction comprising hangers secured to the ridge ends of said plates, and a beam. secured to said hangers.
  • a car roof comprising roof sheets connected by seams, hanger platesembodied in said seams extending substantially from ridge to eaves, nailing strips-secured to said hanger .plates andterminating short of the ridge, an 1;.30
  • said load-lifting beamY construction comprising'A 'a channelshaped member having outstanding flanges at the top of its side walls that are rigidly secured to 16.
  • a car roof comprising roof sheets connected by seams, hanger plates embodied in said seams extending substantially from ridge to eaves, nailing strips secured to said hanger Vplates and terminating short of the ridge, ⁇ an i insulating lining secured to said nailing strips and alsoterminating short of the ridge, a load-lifting bearn.y construction located be-Y tween the spaced ridge ends of said nailing strips andvsaid lining and connecting theV ridge ends of said hanger plates,said loadlifting beam construction comprising two members ofsubstantially Z-shaped cross-sectionithat are disposed with their webs vertical, with their top flanges extending outwardly away from each other and rigidly secured to adjacent ridge ends of said hanger plates and with their bottoni flanges extendapart to provide a slot.
  • ⁇ A car roof comprising roof sheets connected byseams, hanger plates embodied'in said seamsextending substantially from ridge to eaves, nailing strips secured to said hanger plates and terminating short of the ridge, an insulatinglining secured to said nailing strips and alsoterrninating short of the ridge, a
  • said loadf lifting beam construction located between the. spaced Vridge ends of said .nailing strips and Vsaid lining and connecting the ridge ends of said hanger plates, said loadf lifting beam construction comprising two members of substantially Z-shaped cross-sec# tion that are disposed with their webs vertical,

Description

July 12, 1932- c. D. BONSALL 1,856,539
' CAR ROOF Filed June 25. 1951 2 sheets-sheet 1 l I /5 i 4 /m/A/roe: Z0 /5 M IgM/MM' el July 12, 1932. Y C D BQNSALL 1,866,539
` CAR ROOF Filed June 25, 1951 2 Sheets-Sheet 2 ,Y [mu f3 IEW PatenteclJuly 12, 1932 'UNITED 'sTATs'sPArs Nrrcsagc l* "i j l. CHARLES DAVID BoNsALL, or PITTSBURGH, ':en,NNSYILVAITA,A 'AssIGrNoR-.Tov Vr. II.
Aiarriarrrr. COMPANY, or NEW rnNNsYI-.VANIAv Y.
Application filed June 25,
This invention relates to car'roofs, particularlyinsulated car roofs of the type shownin my Patent No. 1,643,975, dated August- 4, 1927, wherein self-supporting roof sheets extend from side'to side of the cark and are rigidly connected along their adjacent mar-` gins by upstanding seams that function as outside carlines vand have lmembers secured therein'for stiflening said seams and for suspendingI the insulating lining beneath said roof sheets.
Iheprincipal object of the present invention is to provide a simple and eficientparrangement for attaching aload-l'ifting beam to roofs of the above type. Other objectsarel ease' of assembly, compactnessof design, fewi ness of parts and cheapness of manufacture;
"The inventionr consists principallyin the parts and in the construction, combinations and arrangements of parts hereinafter described and claimed.
`Vln the. accompanying drawings which form part of the specification'and wherein like symbols refer to like parts'fwherever Fig. 4 is a verticalV longitudinal section;
through the roof in the region of one 4of the seams, the section being taken at the ridge on theline l1-lin Fig. 3.
Fig. 5 isa similar section taken ,intermediate between the ridge and'the'eaves on the line 5-5in Fig. 3. Y 1 Y Fig. 6 is a plan view of'one of the hanger brackets which connect. the ridge ends of the v combined seams stiffeners and lining sup-V ports. and which also support the lifting beam. "u' 'f'zV i ^F ig. 7 is a fragmentary section similar to Fig. 3' showing a lifting beam ofmodiied construction; and
The roof sheets areprovided along their adja-` cent side 'margins with upstanding seam KENSINGTON, PENNSYLVANIA, Al coItroRATIoNor' 1931. seriaiNo. 546,770.
Fig. 8 isa vertical section online 8-'8 in f.
Fig.
v lteferringto 'the accompanying drawings,
my inventionis shown in connectionv with an all-steel riveted-up car roofl comprising metal roof sheets l, whichl extend from side plate 2 vto side plate 2alongsid`e of'each other' and "slope downwardly' on opposite sides of the Y ridge to formapitch or arcuate roof.A As shownfln the drawings, the side plates 2 yare preferably of Z-shaped cross-section and arek positioned with their .webs .horizontal Aand with their inner flanges 3 extending upwardj ly. 'The roof sheets-l are supported on and angle strips 4, which extend longitudinally of the carv with their other flanges proj ecting' downwardly and riveted flatw'ise to the outer faces of the upstanding inner flanges 3 of the side plates 2. f The roof sheets l are provided attheir eaves ends with depending drip flanges 5 that overhangthe outer edges of the eaves angles 4:.
Y .65 riveted to the outstanding top lflanges of eaves i flanges 6 and the body portions of said sheets'V Y are preferablyvoifset 'upwardly' adjacent vto Vsaidila'nges to form raised panels 7. `The side marginal seamflanges `ofthe-roof sheets are coped oif at the'eavesj'e'nds of the sheets andVV merge into theVv plane of the sideA Inarj ginal panelsf thereof. A -v Y Metal strips or plates f8.1of substantially angular cross-.section haveioneflange interposed between the adjacent side seam flanges c 6 of Vadjacent roof sheets, the 'otheriiange extending` beneath the vraised sideV marginal panel 7 of one roof sheet and: being'spacedl jvertically therefrom. Metal seamcaps 9 of substantially inverted U-shapedcrossfsection nef are placed astride adjacent side marginal seamflanges :6 andthe ,vertical flange of the strip 8 interposed therebetweenand are rivetl ed or otherwise'rig-idly securedfto saifd flanges to form an yupstandingl seamgconst'ruction that functions after-'the manner of 'an eX-V terior'carline for the roof. Y -Each seam is-proz vided withtwo ofthe angleshaped plates or Y strips 8 that extend from the side platesfto of the car at the ridge and are supported on f and rigidly secured to the lateral top flanges of angle-shaped running board saddles 12 that are secured to the sides of the seam caps. by the securing rivets therefor.
Bolted or otherwise rigidly secured to the underside of the lateral base flanges of the angle-shaped plates 8 embodied in each seam are vwooden strips 13 that ext-end longitudinally of said plates from the side plates to points short of the ridge ends of said plates. Each wooden strip 13 is rabbetedas at 14, along one of its upper corners to accommodate the baseflange of the seam plate 8 to which it is secured; andthe portion of said strip located on the side opposite fromsaid base .flange is preferably in contact with the raised side marginal roof sheet panel 7 located thereabove. Located below the wooden supporting strips 13 is aninsulating lining 15 of wood or other insulating material, which is nailed or otherwise rigidly secured to the undersides ofY said strips. The wooden strips 13 serve as nailing strips for the insulatinglining 15, and they also serve to space the saidy lining below the roof sheets V,and thus provide dead airV insulating spaces between the roof sheets and lsaid linings..
ends o-f the two angle-shaped plates 8 and stiifener 1n each seam for carline construction are connected together by means ofiasplice member lthat serves as a hanger for aload-v lifting beam 17 which extends longitudinally of thereof at the ridge, preferablyfrom-end to end of the car. Each of these combined splice members and beam hangers 16 comprises a channel-shaped body portion with outstanding top flanges 18 that are bolted or otherwise rigidly secured tothe bottoms of the ridge end portions of the base flanges of the two combinedhanger and Stiening plates 8 foreach seam. T he channel-shaped beam hanger 16 is locatedbetween the spaced ridge a ends. of the wooden nailing strips 13 that are bolted to the hanger plates 8 embodied in the seam; andthe load-liftingbeam 117 is shown inthe form of a metal member of inverted Vchannel-shapedY cross-section with outstanding base flanges19. The web or top portion of the invertedchannelshaped load-lifting beam 17 is riveted or otherwise secured flatwise tothe bottom of the web-of the channelshaped beam hanger 16, with the upper por- 20'which is'slidably supportedon `said flangesv and serves to support a suitable lifting tackle (not shown).
In the construction shown in Figs. 7 and 8, the roof is shown provided with asectional or built-up load-lifting beam 21 of channelshaped section with lateral top flanges 22 that are. bolted or otherwise rigidly secured directly to the bottoms of the ridge end portions of the base flanges of the plates 8 for each seam ,5 and thebottom or web of the channel is provided with a longitudinal slot 23 adapted to slidably receive a ring 24 for'supportingl a lifting tackle (not shown). `The ring-24 is 'slidably supported in the slot 23 by means of-laterally extending portions 25 at the top of said ring. The load-lifting beam 21 preferably comprises two side members or sections 26 kof Substantially Zv-shaped crosssection that are so arranged that their 'webs form the sides of the channel, theirY upper Y flanges formthe top flanges 22of said channel and their bottom'flanges form the slotted bottom of said channel. AThe two side sectionsv y Y pecially insulated car roofs of the type here- As shown in Figs. 1 toV 6, the spaced ridge inlirfore described. It serves to connect together the ridge ends of the two plates embodied in each seam, thereby increasing the strength Yand rigidity of the seam; it permits the insulating lining to be removedv andreplaced without disturbing the lifting beam;
between the spaced ridge endsofthe insulating lining and the wooden supportingstrips therefor that it does not materially decrease the headroom inside ofthe car.
ridge to e'avesthereona load-lifting beam 1 located beneath said roof, and hangers for se'- curing.V said beam to said. roof, each ofmsaid hangersbeing secured torthe topzofsaid. beam and to the adjacent ridge ends ofsaid plates.
2. In a car roof, a series ofplates embodied `and the lifting beam is so compactly arranged therein and extending substantially from ridge to eaves thereof, a load-lifting beam located beneath said roof, and hangers for suspending said beam fromsaid plates, each of said hangers comprising a channel-shaped member secured to the top of'said beam and having side flanges rigidly secured to the adjacent ridge ends of said plates.
3. In a car roof, a series of plateseinbodied therein and extending substantially n fr-om ridge to eaves thereof in pairs, and a channelshaped member for each pair of plates locat-V ed beneath the ridge end portions of said y plates and rigidly` secured thereto.
4. In a car roof, aseries-of plates embodied therein and extending substantially from ridge to eaves thereof in pairs, an insulating liningsupported by saidplates Aand terminating short of the ridge to provide a space, f and a channel-shaped member for eachpairj of plateslocated in said space .beneath` the ridge ends of said plates and `rigidly secured thereto.
5. In a car roof, a series of plates embodiedV therein and extending transversely thereof, an insulating lining supported by said plates and terminating short Vof the ridge to provide an opening inv said lining, hangers located iii said opening below said plates yand secured Yto the adjacent ridge ends of the latter, and a load-lifting beam secured to said hangers.
6. A Car roof comprising roof sheets coney iiected by upstanding. seams, plates embodied and rigidly secured to the seam plates and to in said seams, a load-lifting beam extending longitudinally of the car beneath said plates, and hangers for said beam, each ofsaid hangers comprising a member interposed between said beam.
7. A car roof comprising roof sheetsconnected by seams, plates embodied in said seams, a load-lifting beam located beneath said roof sheets, and a hanger for lsecuring said beam to the plates of each of said seams, said hanger comprising aV channel-shaped member securedto the top of Vsaid beam and having outstanding top flanges that are secured to the adjacent ends of the plates embodied in said seam.
8. A- car roof comprising roof sheets connected by upstanding seams, plates embodied in said seams and extending substantially from eaves to ridge of thereof, a load-lifting beam extending longitudinally ofthe car beneath the roof, and hangers for said beam,
each of said hangers comprising a channel' a load-lifting beam extending longitudinallyj of" the-roof 'a'ii'd rgidly connected tothe l ridge end portions of the plates of the several pairs w 1 0.' 'Ina cai" roof, hanger Vplates embodied'V in said roof and extending transversely theres of substantially from eavesto ridge inipairs, a loadelifting beam extending'longitudinally-ofthe roofI and rigidly connected to the ,ridge end portions of the plates of the several pairs, and an insulating lining for said roof,
said insulatingilining being secured'to saidV hanger plates and extending' from opposite V I sides of-said beam at .the .level thereof-.substantially to the eaves of the roof."
y 1l. In acarroof, hanger plates embodied .in saidro'of and extending transverselythere-,V l
of substantiallyfrom eaves to ridge,a loadliftingbeain yextending longitudinally of theV roof andconnecting the adjacent ridge end portions: of said plates, said load-lifting beam comprising sections arranged to form a chan nel, and ineansxfor securing saidvsections to the ridge V'endsof the hanger plates. -"l2. In a .car roof, hanger plates embodied insaid roof and extending transversely thereof substantially "from eaves to ridge, a load;
lifting beam extending'longitudinally of the roof and connecting the adjacent ridg'eend portions of said plates, said load-lifting beam comprising '-shaped `sections arranged to` forma channel with outstanding top flanges,
means for securing saidl sectionstoitheridge ends of the hangerplates, andmeans forsecuring said sections together. l Y y, 'A car roof comprising roofisheets con* nected byseams,hanger plates embodied in ioo said seams extending substantially from ridge Yto eaves, nailing strips secured to 'said' hanger vplates and terminating short ofthe ridge', 'an insulating. lining secured toisaid nailing strips and also terminatingshort of the ridge, and
-a load-lifting beam constructionlocated beltween tliespaced ridge ends of said nailing Y` strips: and said lining and `connecting the ridge ends of said plates. f
14. A car roof comprisingroof sheets con.-
nected by seams, hanger plates embodied in said seams extending substantially from ridge to eaves, nailing strips secured to said lhanger plates and' terminating short ofthe ridge,5aninsul'ating lining secured to said nailing strips and also terminati'ng'short ofvr the ridge, la load-lifting beam` construction located between the spaced ridgeends of said i nailing strips and said lining and connecting VVthe ridge ends of said hanger plates, said loadlifting beam construction comprising hangers secured to the ridge ends of said plates, and a beam. secured to said hangers.
15 A car roof comprising roof sheets connected by seams, hanger platesembodied in said seams extending substantially from ridge to eaves, nailing strips-secured to said hanger .plates andterminating short of the ridge, an 1;.30
insulating lining secured to'saidnailing strips y plates.
and also terminating shortof'the ridge, and a load-lifting beam construction located betweenthe spaced ridge ends of said nailing strips and said lining and connecting' the ridge ends ofsaid plates, said load-lifting beamY construction comprising'A 'a channelshaped member having outstanding flanges at the top of its side walls that are rigidly secured to 16. A car roof comprising roof sheets connected by seams, hanger plates embodied in said seams extending substantially from ridge to eaves, nailing strips secured to said hanger Vplates and terminating short of the ridge,` an i insulating lining secured to said nailing strips and alsoterminating short of the ridge, a load-lifting bearn.y construction located be-Y tween the spaced ridge ends of said nailing strips andvsaid lining and connecting theV ridge ends of said hanger plates,said loadlifting beam construction comprising two members ofsubstantially Z-shaped cross-sectionithat are disposed with their webs vertical, with their top flanges extending outwardly away from each other and rigidly secured to adjacent ridge ends of said hanger plates and with their bottoni flanges extendapart to provide a slot.
17. `A car roof comprising roof sheets connected byseams, hanger plates embodied'in said seamsextending substantially from ridge to eaves, nailing strips secured to said hanger plates and terminating short of the ridge, an insulatinglining secured to said nailing strips and alsoterrninating short of the ridge, a
load-lifting beam` construction located between the. spaced Vridge ends of said .nailing strips and Vsaid lining and connecting the ridge ends of said hanger plates, said loadf lifting beam construction comprising two members of substantially Z-shaped cross-sec# tion that are disposed with their webs vertical,
with their top flanges extending outwardly away from each other and rigidly secured to adjacent ridgeends of said hanger plates and with their bottom flanges extending inwardly towards each other and spaced apart toprovide a slot, and means for securing to- Y gether the vertical webs of said members.
Signedl at New Kensington, Pennsylvania, this 22nd da-yof June,1931. I
' l CHARLES `DAVID BONSALL.
es, .j
the adjacent ridge ends of saidv ing inwardly towards each other and spaced
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3815520A (en) * 1971-12-21 1974-06-11 Detroit Bullet Trap Corp Shooting range ceiling protection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3815520A (en) * 1971-12-21 1974-06-11 Detroit Bullet Trap Corp Shooting range ceiling protection device

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