US 2634173 A
Description (OCR text may contain errors)
C. D. MAYHEW SCAFFOLD 2 SHEETS-SHEET 1 Filed March 22, 1951 mm R Q H R Q m w mm 5; m Q m E .J 5?.
ATTORNEY April 1953 c. D. MAYHEW 2,634,173
SCAFFOLD Filed March 22 1951 2 SHEETS-SHEET 2 I II II II II II lllll '7 INVENTOR' C/ffion D. Maghew M 2 ATTORNEY Patented Apr. 7, 1953 UNITED STATES PATENT OFFICE SOAFFOLD Clifton D. Mayhew, Washington, D. 0.
Application March 22, 1951, Serial No. 217,016
1 Claim. (Cl. 304 -18) This invention relates to a scaffold, and more particularly to a scaffold that can be used for supporting painters or other persons that are painting or doing other work on the exterior of buildings.
The object of the invention is to provide a scaffold which can be readily suspended from a building whereby workmen, such as painters, stand on thescaifold in order to paint windows, the scaffold of the present invention enabling the workers to perform their work in a quick, ellicient and economical manner.
Another object of the invention is to provide a scaffold which may be fixed in height or adjustable in height, the scaffold adapted to be used by painters, window washers or repairmen, or other persons, the scaffold of the present invention enabling the users to work with greater safety and efficiency.
A further object of the invention is to provide a scaffold which is extremely simple and inexpensive to manufacture.
Other objects and advantages will be apparent during the course of the following description.
In the accompanying drawings forming a part of this application, and in which like numerals are used to designate like parts throughout the same:
Figure 1 is a fragmentary side elevational view of a building, showing the scaffold of the present invention attached thereto;
Figure 2 is a sectional view taken on the line 2-2 of Figure 1;
Figure 3 is an enlarged fragmentary end elevational view showing the bottom of the scaffold;
Figure 4 is a fragmentary top plan view of the scaffold showing the bumper assembly;
Figure 5 is an end elevational view of a modified scaffold attached to a building;
Figure 6 is a sectional view taken on the line 66 of Figure 5;
Figure '7 is an enlarged fragmentary elevational view showing the gear adjusting mechanism for the scaffold of Figure 5;
Figure 8 is a sectional view taken on the line 8-8 of Figure 7.
Referring in detail to the drawings, the numeral designates a portion of a building which includes side or end walls I9 and a plurality of windows 2| which may be arranged in the wall I9. Each of the windows 2| includes a frame 22 and arranged within the frames 22 are window panes 23. A portion of the roof ledge is indicated by the numeral 24, Figures 1 and 2.
The present invention is directed to a scaffold which is adapted to support painters or other persons thereon, whereby such persons can perform various tasks, such as painting the window frames 22. The scaffold of the present invention includes a pair of spaced parallel bars 25 which are vertically disposed, and the bars 25 may be fabricated of any suitable material, such as round metal stock. The upper end of each of the bars 25 is shaped arcuately to provide a hook 26, and the ends of the hooks 26 are pointed, as at 21, the pointed ends 21 adapted to engage the upper surface of the roof portion 24, whereby the scaffold can be suspended or supported from the top of the building.
Arranged on the lower end of each of the bars 25, or formed integrally therewith, is a stirrup 28, Figures 2 and 3. Each of the stirrups' 28 includes a horizontal lower portion 29,a short vertical portion 30, and an inclined portion 3| which may be secured in any suitable manner, as by welding, to the vertical portion of the bar 25.
Extending between the pair of stirrups 28 and supported thereby is a horizontally disposed platform 32 which is adapted to support the painters or other persons thereon. The platform 32 includes a plurality of spaced parallel strips 33 which may be secured in any suitable manner to transverse cross pieces 34, Figure 3. Extending beneath the strips 33 is a pair of spaced parallel longitudinally extending beams 35.
The scaffold of the present invention further includes a plurality of bumper assemblies which are indicated each by the numeral 36. Each of the bumper assemblies 36 includes a horizontally disposed arm 3'! that is provided with a plurality of spaced openings 38 therein. For maintaining the arms 3'! immobile in their various adjusted positions, bolts 45 extend through certain of the openings 38, and the lower ends of the bolts 40 are shaped arcuately for engaging the beams 35, there being a cable 4| arranged below each of the beams 35.
Arranged on each of the bolts 40 adjacent the upper end thereof is a washer 42, and a nut 43 is arranged. in threaded engagement on the threaded upper ends 64 of the bolts 43. The nuts 43 serve to maintain the parts in their proper positions. By loosening the nuts 43, and removing the bolts 40 from the openings 38, the arms 31 can be adjusted along the platform 32 to the desired location, whereupon the bolts 48 can be reinserted in the desired openings 38 and the nuts 43 again applied. Ihe inner end of each of the arms 3! is cut away, as at 46, and rotat- 4 ranged on opposite sides of the bar 52. Arranged on the lower end of each of the shanks 6| is a stirrup 62, the stirrups I52 serving the same pur- 2, are adapted to be engaged by the working;
mans feet, whereby the person or workingman can readily climb from the platform 32 up the steps 4-8 and onto the roof 24 or vicevers a, 'llhe 611s provided. The crank 61 includes a straight scaffold of the present invention 'canbe r dily" moved along the building, as when it is desiredto paint additional window frames 22 by merely picking up the hook portions 26 and moving the scaffo d t n hs ne -de$i. d t 9ey s a safe- W] prec u on, e,,, 4 1 exten s l u id rfilqm. eachb th bar 5 a d -s c redt eretqiheer; suitable manner, as for example, by welding; o me integrally w th 9 2 e d, 9?. s al of the rods lg or securedthereto is a s ipport p rt 5 a d. x en in betw en ot r Peirhe su r e o 5 h r e y ea e956? uar rail! When usinglthe s ehbid shown inhihiire *1" through 4, the pointed ends 2,! are enga ed with;
thefu pelsiirface of the roof 24. en-,mepen iters will han or be suspended from the roof, as shown in Figures 1 and 2 The; rollers of the; bumper assemblies 3 5 willjmaintain the bottoms of the bars 25 properly spaced from the wan '19 of the" building 20, and the platform s2,v which extends between the pair r stirrups will provide a: convenient support; for painters or other persons'working'on the building." }'Thfe arms 3! of the bumperassemblies fican beadjusted as desired "so that the space between the bottoms of the bars 25 and the building can beregulated as 'des'iredf' Further the", men can gain "access ,tothe roof 24froi'n' the platfo' 3? tyflmeahs or the steps aa-"e the men can e s'e'ehd ohtdthe'piatrorm'tz by means ofth'e teps 48. 'Furt'her', the guard rail' 5 I ihsures' that' the men can work in the "utmost safety.""Wheni 't' isd e's ired to move the scaffoldi'as' fqr ezgample,j whenfthewindows in a particular area havelbeen painted, the"baisfi25 can be readily lifted by eans ofi pe'rsons standing on the roof f24"and moved to thefnex'tlocation. "Referring to Figure's' 5 to 8 of'th drawings,
there'is'shown a' modified fa m of t v eel the numeral 52' designating each'of a pair of bars: which may be fabricated'of anylsuitablefma terial. The upper end of each of"=' thebars'52f is'shaped to provide ahook54 that terniiri t's" in-a pointed "end 55 for" engagement with thfe roof portion; 24 of the building ZBJA securing" element "56 extends through the bottdniofthe bar 52, the securing element 5fi'coiist-itiiting a stop member for limiting downward movement of a movable carrier 51. -Thecarrier :51 includes a pair of spaced paral lel plates- 58 that may bef'abr'icated of any suitable materialysuch as metal, and a cross piece 59 extends between the pair of plates '58 and is secured thereto, as by welding. Interposed be tween the pair of plates 58' and secured thereto isa block 60; and a shank 6| has its upper end secured to the block 60', the shank 6| consisting of a .pair oftubular, bars which may be secured Q fith lf ha ;by ,,we1dine. rThe plates. '58marearto or fromthe platform sg;
pose and having the same construction as the previously described stirrups 28. A horizontally disposed platform 32 extends between the pair of stirrups 62 and the platform 32 is adapted to support painters or other persons thereon.
--A means: is provided for causing' moyement of the carrier 51 up-and-down th8rfb&1S 52. This means comprises a shaft 63 which extends between the pair of plates 58, there being a sleeve r spacer 64 circumposed on the shaft 63. A pair of gears 65 and 66 are mounted on the shaft 83. Eoreausing movement of the carrier 51, a crank portion fiflthatextends through a bracket 69, the 1 straight portion 68 being arranged between the pair of plates 58. Mounted on the straight porm .5.3 wo Wh 111 i f jlll h 8 3 it. .A'h nd ell f eo este r h sm the tr P t on i'f 5. Y manua ly, Mur ne t he le he e r e i e tifl w llg tat and this will cause rotation of the shaft fii l fTl'i e gear teeth on thegear 66 are arrangedin meshing engagement with the teeth 53 ofthezbar 52, so thatthisrotation of the handle 'Il wil thecarrierj'! to move upland downalon e bar 52. As'the carrier 57 movesfit ,carries"the block so therewith,so that the shank s1 and dit. runs 62 will likewise mev wh r y the platform 32 can be raised or loweredas desired; "Thusjthe platform 32 can be adjusted to'anvdesirc'delevation, whereby various portions ofythe building can be worked on. u v p The scaffold of Figures 5 througha'jurthen el ump s mbl e 367 w ichs; maintain thebottoms of the bars, 52 pr perlyj Spaced from h bui di lt. ,fi ie lefi cil i elements, such as bolts-7,5, extendbetween the pair of plates 58 for maintaining the t em ers' in their proper spaced and" assembled re'la Further, the scaffold, shown inj'ig'uresjji through 8 includes the guardrail assemblywhjbfi has the same construction as that use ithithg,
form of the invention "of-Figures; 1 through 4., Thus, 'a' horizontally disposed arm 12 "exte s m. e t rr e and ssesure e to 1 u a e a ne an ew fidgp ea o l the arms12 is shaped toprovidea support'pofij Piqn 73-. A her eiall idispo edisuar zi extends between the pair-of 'support-porti Horizontally disposed steps 15' may whereby the menca readilyjascend oi jdes en; 1 m .iheflse i d.shewnf iiii ur through-'3, thepointed en'ds '5 5 'are' arran d, ri' engagement with the upper-surface of. a roof portion 24. Then, workingmen'can stand on the platform '32 and.- pa'iht windowjfrarfiesf 2 Phi do other tasks. The height of the platform 32 pan be'a'djustedreadily' when desired by rotati g the handle ll." Thus, upon rotation ofthefhandle' 1 I, the worm mwnreemrneta andtliis'wfllcause the shaft 63 to be rotatedfs'oti'i'atgear 35"mesh'es with the worm 10. e the shaft f6'3 r6tates'ffit tu'i'hs th'e gear stan since thteethofthgear.
on thbar'flftlienthe carrier! willm'ov cally alo n g the f barfs'zl 'I'tjjis ats thee thatthere are; of the bars 52,"iand: ons quently two carriers '5l for' th omplete ,s'cafiiol As the'carrier 51 moves yert cally alongjthejlia'ii 52, it will cause sirriilar movement; r the 3 10 k so: since the hidektu is "to tIiEbairiiSF'II.
This movement of the block 60 will result in up or down movement of the shank BI, and thisin turn causes the stirrups 62 and platform 32 to be raised or lowered depending upon the direction of rotation of the handle ll.
The scaiTold of the present invention can be used by painters, window washers, repairmen or other persons. The scaffold is safe to use and can be easily moved from place to place and will result in an economy in labor costs.
What is claimed is:
In a scaflold, a carrier including a pair of spaced parallel plates connected together, a cross-piece extending between said pair of plates and secured thereto, a block interposed between said pair of plates and secured thereto, a shank having its upper end secured to said block, a bar extending between said pair of plates, the upper end of said bar being shaped to provide a hook, said hook terminating in a pointed end for engagement with the roof portion of a building, a stop member adjacent the end of the bar opposite the hooked end, for limiting downward movement of said carrier, said bar being provided with a plurality of teeth thereon, a rotatable shaft extending between said pair of plates perpendicular to said bar, a spacer circumposed on said shaft, a first and second gear mounted on said shaft, said first and second gears spaced longitudinally by said spacer, a crank including a straight portion extending perpendicular to said bar and said shaft between said pair of plates, a bracket extending between said pair of plates,
said bracket being parallel to said shaft and spaced therefrom and an aperture in said bracket, said aperture receiving the straight portion of said shaft, a worm gear mounted on said straight portion and meshing with said first gear, said second gear engaging the teeth on said bar, a handle connected to the end of said straight portion, and a stirrup arranged on the lower end of said shank.
CLIFTON D. MAYHEW.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 111,540 Hollabaugh et a1. Feb. 7, 1871 200,767 Sanderson Feb. 26, 1878 842,331 Palmer Jan. 29, 1907 866,078 Sims Sept. 17, 1907 1,689,626 Gallowitz Oct. 30, 1928 1,830,369 McIntosh Nov. 3, 1931 2,072,354 Biebel Mar. 2, 1937 2,326,983 Sway Aug. 17, 1943 2,433,859 McCormick Jan. 6, 1948 FOREIGN PATENTS Number Country Date 191,254 Great Britain Jan. 11, 1923 598,351 France Dec. 15, 1925 630,926 Germany June 9, 1936