US2870900A - Construction elevator - Google Patents

Description

Jan. 27, 1959 w. B. WILL 0 2,870,900

CONSTRUCTION ELEVATOR Filed Jan. 26; 1955 3 Sheets-Sheet l INVENTOR. 11 44/447 5. W/Z

Jan. 27, 1959 w. B. WILL CONSTRUCTION ELEVATOR 5 Sheets-Sheet 2 Filed Jan. 26, 1955 lllll/ I'll/ lll l INVENTOR, W/AZM/W 5. fV/ZL av W186;

Ai-roRNEYs Jan. 27, 1959 w. B. WILL 2,870,900

CONSTRUGTIGN ELEVATOR Filed Jan. 26. 1955 3 Sheets-Sheet 3 INVENTOR, a W/ZZMMB W/AL 8' 0 ATI'DRNEYB United States Patent 2,870,900 CONSTRUCTION ELEVATOR William B. Will, Honolulu, Territory of Hawaii Application January 26, 1955, Serial No. 484,157 9 Claims. (Cl. 198-72) This invention relates to elevators of they temporary type such as used in building construction and repair and particularly in repairing and constructing roofs, and in particular, this invention includes an elevator having scoops or buckets for gravel and other material, brackets for rolls of roofing material, and the like, and arms for carrying rods with buckets of tar and the like suspended from ends thereof positioned on an endless chain or chains; and said elevator having independently installed bucket filling and chain take-up means at the lower end and operating and product receiving means at the upper end.

The purpose of this invention is to provide a temporary elevator adapted to be used in building construction that is adapted to be readily set up for use andthat is adapted to carry cargo of various shapes, sizes and designs.

Various types of elevators have been provided for building construction and, whereas the conventional elevator having a vertically disposed frame with a traveling cage or platform is satisfactory for general building use,

such elevators are too elaborate and costlyfor repair work and particularly for use in resurfacing a roof. With this thought in mind, this invention contemplates a single chain elevator having an independently mounted boot structure. at the lower end and a pair of beams for supporting a sprocket and also for receiving products at the upper end and in which a chain, trained over the sprocket at the upper end and extended around an idling wheel at the boot, is provided with scoops or buckets ice support for a tail shaft with an idlingwheel having a guide rib thereon and take-upmeans for adjusting the position of the tail shaft at the lower end, a head shaft having a sprocket thereon mounted on a pair of beams adapted to be positioned on a parapet, firewall or roof at the upper end, driving means for operatingthe head shaft and means for receiving products carried by the elevator also positioned at the upper end, and a chain having buckets, brackets and arms mounted thereon trained over the sprocket of the head shaft and the idling wheel of the tail shaft and adapted to be actuated, by the sprocket of the head shaft.

Other features and advantages of the invention will appear from the following description, taken in connection with the drawings, wherein:

Figure 1. is a side elevational view illustrating the improved construction elevator showing an. idling wheel on a tail shaft rotatably mounted in a support at the lower end, a bucket filling, hopper support, a sprocket mounted on a head shaft rotatably mounted on beams at the upper end, and a chain with rolls of building paper or material, particularly as used for roofing, on the upwardly traveling section of the chain, the elevator being shown at the side of abuilding portions of which are shownin section.

Figure 2 is a plan view showing the upper end of the elevator with beams providing a platform, and power driving means at one side thereof, parts of the platform and building upon which the device is, positioned being for carrying loose material, such as gravel, brackets which are adapted to extend outwardly for carrying rolls, such as rolls of roofing material, and arms such as are adapted for carrying a rod with bucket retaining elements on extended ends thereof.

The object of this invention is, therefore, to provide means for forming a temporary single chain elevator wherein the elevator may readily be set up for carrying materials to a roof and wherein the elevator is. adapted to carry various types of cargo.

Another object of the invention is to provide limit switches adapted to be used on an elevator for carrying building materials wherein the elevator is adapted to be stopped when building materials reach or pile up at the upper end. j 3

Another important object of the invention is to provide a temporary elevator for building construction in which objects, such as rolls of roofing paper or material, may readily be placed on the elevator.

A further object of the invention is to provide a temporary elevator for building construction that is adapted to be readily adjusted to different lengths.

A still; further object of the invention is to provide a temporary elevator for building construction in which the elevator is adapted to carry products of diiferentftypes in which the elevator is of a simple and. economical construction.

With these and other'objects and advantages in view, the invention embodies a temporary elevator having a broken away.

Figure 3 is a front elevational view of the elevator with the parts as shown in Figure 1 showing the conveyor chain and guide cables or ropes at the sides thereof, parts thereof being broken awa p Figure 4 is a cross section through the upper part of the elevator taken on line 4-4 of Figure 1, with the parts shown on an enlarged scale, showing, in particular, the head shaft and sprocket carried thereby.

Figure 5 is a cross section through the supporting elements at the upper end of the elevator taken on line 5--5 of Figure 1 with the parts shown on an enlarged scale.

Figure 6 is a vertical section through the lower end of the elevator taken on line 6-6 of Figure 1, with the parts shown on an enlarged scale, showing the idler guide wheel and take-up elements.

Figure 7 is a sectional plan taken on line 7-7 of Figure 6, with the parts shown on a still further enlarged scale, showing one of the traveling blocks of the take-up device on one side of the elevator.

Figure 8 is a cross section through the platform adapted to be positioned on top of the building, taken on line 8-8 of Figure 2, and showing the parts on. an enlarged scale.

Figure 9 is a view, taken on line 9-9 of Figure 2,

showing a ratchet on the head shaft of the elevator for preventing the weight of products on the chain reversing the direction of travel of the elevator and illustrat: ing a connection to a reciprocating baflle which travels in under buckets depositing gravel and the like to prevent waste.

Figure 10 is a longitudinal section through the mounting structure at the upper end of the elevator, taken on line EAL-16) of Figure 2 illustrating a reciprocating baffie which slides in under dumping buckets to prevent products dropping downthe elevator. i

Figure 11 is a view illustrating a bracket for holding an elongated object, such as a roll of rooting paper or material, on the chain of the elevator. i t

Figure 12 is a view, similar to that shown in Figure 11, taken on line 1212 of Figurell, showing a bucket or scoop mounted on the chain of the elevator.

as'roeoo Figure 13 is a vertical section, taken on line 1313 of Figure 12, showing a cross section through the bucket.

Figure 14 is a side elevational view showing the bracket for, holding a roll of building paper or roofing material on the chain of the elevator.

Figure 15,.is a view, similar to that shown in Figure 11, showing an arm for supporting a rod having hooks on the ends for carrying buckets upwardly by the chain.

Figure l6v is a side elevational view showing the up per end of..the elevator, with the parts as shown in Figure 1, illustrating a modification wherein a ramp is provided for loading products on the upper end of the elevator to use-the elevator for carrying products from the top of the building to the ground.

Figure 17 is a plan view of the elevator with the parts as; shown in Figure 16.

Figure 18 is a longitudinal section through the upper end of the elevator with parts broken away and showing anotherv modification wherein a rocking bafile adapted; engaged by an elevator bucket is provided.

Figure 19 is a cross section through the upper part of the elevator taken on line 1919 of,Figure 18.

Figure 20. is a view showing a portion of the upper end of theelevator illustrating a further modification wherein the elevator is provided with two chains.

Figure 21 is a View showing a stop switch positioned to be engaged by a lug on the chain of the elevator with the parts shown on an enlarged scale and illustrating means. for; stopping the elevator after objects are deposited at the upper end to prevent said objects piling upat the upper end of the elevator.

Referring now to the drawings, wherein like reference characters denote corresponding parts, the improved construction elevator of this invention includes an endless chain 10 having buckets 11, brackets 12 and arms 13 mounted thereon, a tail shaft 14 mounted in an A- frame or stand at the lower end, guide ropes or cables 15 and 16. positioned at the sides of the chain for balancing long objects such as rolls of roofing material, a guiding idler wheel 17 mounted on the shaft 14, a head shaft 18 rotatably mounted in bearings 19 and 20secured on side beams 21 and 22 at the upper end of'the elevator with bolts 23, a sprocket 24 mounted on the head shaft, and a motor or engine 25 mounted on a stand 26 for driving the head shaft 18 through a a gearreduetion 27 witha belt 28 trained over a pulley 29, onthe motor 25 and a pulley 30 on the gear reduction 27 and belt 31 trained over pulley 32 on the gear reduction and a pulley 33 on the head shaft 18.

The. boot of the elevator, as illustrated in Figures 1 and 6, includes a feed hopper 34 which is secured by bolts 35 to beams 36 and 37 at the upper ends of supports 38 and 39, respectively, which provide an A- frame or stand, and although the stand is illustrated as being positioned above a floor, as indicated by the numeral 40, it will be understood that the hopper 34 may be positioned in the floor or whereby products may be dumped therein from a wheelbarrow or the like in the conventional manner. In the design shown, the stand is provided with a platform 41 upon. which sacks; of cement, gravel, sand, or the like, may be positioned, as indicated by the numeral 42, whereby the sacks may be placed in the brackets or buckets or dumped in the hopper as may be desired. The sacks of material, or the like may also be used as weights for retaining the boot or lower end of the elevator in position.

The extended ends of the side beams 21 and 22, at the upper end of the elevator, may also be provided with a box or hopper, as indicated by the numeral 43, the box being filled with weights, such as rocks, and carried by supporting frames 44 and 45 to which the ends'of the side beams 21 and 22 are also attached, as shown inFigure l.

The ends of the side beams 21 and 22, are also profit) 4. vided with bars 46 pivotally mounted by hinges 47 at the upper corners of'the side"beams and retained in upwardly extended positions by arms 48 carried by a bar 49 extended across the end of the platform and retained in vertically disposed positions, as shown, with a pin 50 positioned in an opening in the side beam 22.

The upper ends of the side beams 21 and 22 are provided with guide bars 51 and 52 which are inclined upwardly, as shown in Figure l, and the guide bars are positioned to receive elongated products such as rolls of roofing paper or material as. indicated by the numeral 53. The rolls, which are carried by the brackets 12, are deposited upon the guide bars 51 and 52 as the brackets pass over the sprocket 24. on the head shaft 18, and from the guide bars the rolls roll to positions on the side beams 21 and 22. The side beams 21 and 22 are positioned to rest upon blocks or a strip of material, as indicated by the numeral 54, positioned HPQn the upper surface of a parapet or wall SSeXtended upwardly from "a roof 56 die bu'i1ding, as indicated by the numeral 57. i

A rocking bafile 58,015 the design shown in Figure 18, pivotally mounted in the side beams 21 and 22 with a rod 59, is adapted to be actuated by outer edges of the buckets 11 engaging the short end 60 of the baflle'whereby the extended end 61 moves upwardly as shown by the dotted lines 62. The battle 58 is positioned to receive gravel, sand, and the like, deposited from the buckets 11 thereon as the buckets pass over the sprocket 24 of the head shaft as shown by the bucket indicated by the numeral 64 in Figure l. i i

A belt take-up roller 65 rotatably mounted in a yoke 66 adjustably mounted by a threadedstern 67 on a plate 68 extended from the side beam 22 is positioned to engage the belts 31 to take up slack therein and to determine the amount of tension required for the amount of 103(1'10 be carried. The position of the roller is adjusted by the threaded stem 67, the stem being retained'in adjusted positions with a lock nut 69. i

The head shaft 18 is provided with a ratchet wheel 70, the teeth of which are engaged by a pawl 71 pivotally mounted on the side beam 21 with ahinge 72and resiliently urged into engagement with the teeth of the'ratchet wheelby a spring 73.

The brackets 12 are pivotally,mounted with; cleats 74 of the chain 10, as shown in Figure 11, and the brackets are retained in extended p'ositions 'with chains 75v and 76.

a m 13-35 s uredtqtha h in 0, wi h a te s. such as the rivets 77, and extended ends 78. and'7 9 ofthe arms are providedwith notches and 81, respectively, that are positioned to receive rods 82, as indicated by the dotted lines in Figure 3, whereby buckets 83 maybe suspended byhooks 34 and 85 at the ends'ofthe rods. By this means the weight of 'thebuckets causes the buckets to hang downwardly whereby the rod 82 is elevated above the teeth of the sprocket 24 on the head shaft 13 sothat rods, such as the rods 82, ,may be deposited upon the shoes or guide bars 51 and 52at the upper end of the elevator.

As illustrated in Figure j 3, the rods 82, for carrying buckets, such as the buckets 83, which may be filled with hot tar, or the like, are adapted tobe retained in horizontally disposed positions by the ropes or cables 15 and 16, the lower. ends of whichare attached to struts 87 and 88 of the A-frames or stand and the upper ends of which are attached to extended ends .89 and 90 of the guide bars 51 and 52. The guide ropes or cables are positioned whereby ends of rolls, suchas the rolls 5 3, s'lide upwardly on the ropes asthey are carried upwardly by thebrackets 12 of thechain, the cables preventingfobje'cts, such as the rods 82 when carrying buckets of hot tar, twisting or turning.

The reciprocating baffle, as illustrated in Figures9 and 10 and which is indicated by the numeral 91, is pivotally connected to a pitman arm 92 with a pin ,9 3 andfthe pitman is pivotally mountedwith a p in., 94j,on ;theratchet,

wheel 70 and with the pin 94 adjusted to a desirable position the end of'the bathe 91 moves inwardly below the end of a bucket, such as the bucket 64, as thebucket deposits material at the upper end of the elevator whereby waste of material is prevented and as the bucket approaches the position of the baffle the pitman rod 92 moves the baflie out of the path of the bucket.

The bafiie 91 and also the baflie or plate 58 are positioned to deposit materials into a hopper" 95, asshown in Figure 10, and the hopper 95 is provided with a gate or door 96 that is adapted to swing outwardly, or slide to one side, to an open position as it is desired to dump products from the hopper into a wheelbarrow, or the like. In the design shown in Figure 1 the gate 96 is provided with a handle 86 by which the gate may be drawn upwardly to open the hopper.

The guiding idler wheel 17, which is mounted on the tail shaft 14, is provided with an annular rib 100 that is straddled by the chain and, as illustrated in Figure 6, the wheel 17 is retained in position on the shaft with set collars 101. The ends of the shaft are mounted in openings 102 in bearing blocks 103 of take-up frames 104 with screws 105 and 106. The frames are mounted' on the beams 36 and 37 and the bearing blocks areadjusted to take up slack in the chain by screws 107 and 108, the screws being provided with lock nuts 109.

The gate 96 of the hopper 95 is mounted in tracks formed with angle bars 97 and 98 and the upper end of the .gate is pivotally mounted with a pin 99, in the side beams 21 and 22, as shown in Figure 10, whereby the gate is adapted to swing outwardly,- or slide laterally.

As illustrated in Figure 16, the elevator is provided with a ramp 110 having hand rails 111 extended upwardly therefrom, the lower ends of the rails being secured to the side beams 21 and 22, as shown at the point 112, and the outer or high end of the ramp being supported by posts 113. By this means an operator may carry rolls of paper, or the like, that have not been used whereby the rolls may bedeposited in the brackets 12 and, by reversing the direction of travel of the elevator, carried downwardly to the ground. This ramp is adapted to be removed when the elevator is operating to carry material upwardly to the roof. A guard chain 126 is extended between the hand rails 111 of the ramp 110.

The rods 82 are carired upwardly by the chain and deposited on the guides 51 and 52, the rods sliding downwardly and stopping in recesses 115 in the guiderods, and at the same time a stop switch 116 is engaged by a lug 117 on the chain as shown in Figure 21 so that the elevator may be automatically stopped as the buckets are deposited to prevent buckets of hot tar or the like piling up on the guide rods.

As illustrated in Figure 20, the elevator may be provided with a pair of chains 120 and 121 and the chains are adapted to be connected to the ends of buckets 121, similar to the buckets 11.

A pair of idler guide wheels 122 are rotatably mounted on a shaft 123 at the lower corners of the extended ends of the side beams 21 and 22 to feed the chain to the sprocket 24i Guard 124 is mounted on the lower surface of each of the beams 21 and 22 to provide guides for objects passing upwardly on the chain.

It will be understood that although an electricmotor is illustrated and described the elevator may be actuated by an internal combustion engine or by other suitable means.

It will be understood that other modifications, within the scope of the appended claims, may be made in the design and arrangement of the parts withoutdeparting from the spirit of the invention.

What is claimed is: t

1. A building construction elevator comprising a support, a tail shaft mounted in said support, a guiding idler wheel rotatably mounted on the tail shaft, a vertically disposed building wall having a roof spaced downwardly from the upper edge and extended therefrom, spaced beamsmounted in inclined positions on the wall with 7 structure,

upper ends of the beams resting upon the upper edge of the wall and with lower ends thereof resting upon the roof, the upper ends of said beams being extended from the wall, the hopper extended between the beams and secured to lower surfaces thereof, an inclined baflle also extended between the beams and positioned to receive products deposited by carriers of the elevator, the inclined baffle guiding products from the elevator to the hopper depending from the beams, a head shaft rotatably mounted on the extended ends of said beams, a sprocket on said head shaft, power means for rotating the head shaft, and a chain having material carrying elements thereon trained over the sprocket and guiding idler wheel.

2. A building construction elevator comprising an elevator boot structure, a tail shaft mounted in said boot structure, a guiding idler wheel rotatably mounted on the tail shaft, a vertically disposed building wall having a roof spaced downwardly from the upper edge and extended. therefrom, spaced beamsmounted in inclined positions on the wall with upper ends of the beams rest ing upon the upper edge of the wall and with lower ends thereof resting upon the roof, the upper ends of said beams being extended from the wall, the hopper extended between the beams and secured to lower surfaces thereof, an inclined baffle also extended between the beams and positioned to receive products deposited by carriers of the elevator, the inclined baflie guiding products from the elevator to the hopper depending from the beams, a head shaft rotatably mounted on the extended ends of said beams, a sprocket on said head' shaft, power means for rotating the head shaft, a chain having material carrying elements thereon trained over the sprocket of the head shaft and idler wheel of the tail shaft, and means for reciprocating the inclined bafile whereby the baflle is moved toward the elevator chain for receiving material and from said elevator chain to carry the material to said hopper.

3. A building construction elevator comprising an elevator boot structure, a tail shaft mounted in said boot structure, a guiding idler wheel rotatably mounted on the tail shaft, a vertically disposed building wall having a roof spaced downwardly from the upper edge and extended therefrom, spaced beams mounted in inclined positions on the wall with upper ends of the beams resting upon the upper edge of the wall and with lower ends thereof resting upon the roof, the upper endsof said beams being extended from the wall, the hopper extended between the beams and secured to lower surfaces thereof, an inclined bafl'le also extended between the beams and positioned to receive products deposited by carriers of the elevator, the inclined bafile guiding products from the elevator to the hopper depending from the beams, a head shaft rotatably mounted on the extended ends of said beams, a sprocket on said head shaft, power means for rotating the head shaft, a chain having material carrying elements thereon trained over the sprocket of the head shaft and idler wheel of the tail shaft, guiding elements secured to the boot structure and beams and spaced from sides of the chain, and means for reciprocating the bafiie whereby the baflle receives products from the elevator and deposits the products in the hopper and wherein movement of the baffle is synchronized with thepassing of material carrying elements of the elevator so that the baflie moves away from the elevator to permit said material carrying elements to pass.

4. A building construction elevator comprising an elevator boot structure, a tail shaft mounted in said boot a guiding idler wheel rotatably mounted on the tail shaft, a vertically disposed building wall having a roof spaced downwardly from the upper edge and extended therefrom, spaced beams mounted in inclined positions on the walls with upper ends of the. beams restmg upon the upper edge of the wall and with lower ends thereof resting upon the roof, the upper ends of said beams being extended from the ,waILthe hopper extended 1 between the beams and secured to lower surfaces thereof,

gem-90o an inclinedbaffie-also extended between the beams and positioned to receive products deposited by carriers of the elevator, the inclined-bathe guiding products from the elevator to'the hopper depending from the beams, a head shaft rotatably mounted: on the extended ends of said beams, asprocket on said head shaft, power means for rotating the head shaft, a-chain having material carrying elements thereontrained over thesprocket of the head shaftand idler wheel of the tail shaft, guiding elements secured to the boot structure and beams and spaced from sides of the chain, said guiding elements positioned to be engaged by ends of elongated objects carried by the chain, and means for reciprocating the baffle whereby said baffle is actuated to a receiving position upon the approachof a material carrying element of the elevator and is withdrawn after receiving material from the material carrying element to permit passage of said material carrying element.

5. A building construction elevator comprising an elevator boot structure, a tailvshaft mounted insaid boot structure, a guiding idler wheel rotatably mounted on the tail shaft, take-up devices mounted on the boot structure and in which the tail shaft is mounted, a vertically disposed building wall having a roof spaced downwardly from the upper edge and extended therefrom, spaced beams mounted in inclined positions on the wall with upper ends of the beams resting upon the upper edge of the wall and with lower ends thereof resting upon the roof, the upper ends of said beams being extended from the wall, the hopperextended between the beams 9 and secured to lower surfaces thereof, an inclined bafile also extended between the beams and positioned to receive products deposited by carriers of the elevator, the inclined baffle guiding products from the elevator to the hopper depending from the beams, 21 head shaft rotatably mounted on the extended ends of said beams, a sprocket on said head shaft, power means for rotating the head shaft, a chain having material carrying elements thereon trained over the sprocket of the head shaft and idler wheel of the tail shaft, guiding elements secured to the boot structure and beams and spaced from sides of the chain, said guiding elements positioned to be engaged by ends of elongated objects carried by the chain, a pitman arm positioned with one end pivotally connected to the baffle and the opposite end pivotally connected to a pin eccentrically positionedat the end of the head shaft,

said pitman arm and eccentric pin imparting to the baffle a reciprocating action whereby the baffle moves inwardiy toward the elevatorchain to receivematerial from the material carrying elements of thechain and also moves away fromdhe chain to permit the'material carrying elements to pass.

6. A building construction elevator comprising an ele-' vator bootistructure, atail 'shaftmounted in said boot structure, a guiding idler wheel rotatably mounted on the tail shaft, take-up devices-mounted on the boot structure and in which the tail shaft is mounted, a vertically disposed building wall having a roof spaced downwardly from the upper edge and extended therefrom, spaced beams mounted in inclined positions on the Wall with upper ends of the beams resting upon the upper edge of the wall and with lower ends thereof resting upon the roof, the upper ends of said' beams being extended from the wall, the hopper extended between the beams and secured to lower surfaces thereof, an inclined baffie also extended between the beams and positioned to receive products deposited by carriers of the elevator, the inclined bathe guiding products from the elevator'to thejhopper depending from the beams, a head shaft rotatably mounted on the extended ends of said beams, a sprocket on said head shaft, power means for rotating the head shaft, a chain having material carrying elements thereon trained over the sprocket of the head shaft and idler wheel of the tail shaft, guiding elements secured'to the boot structure and beams and spaced from sides of the chainrsaid.

guiding elements positioned to be engagedby ends-of elongatedobjectsocarried by the chain, aereciprocating, baffle positioned above the platform atcthe'iupper end of the elevator: and: means for reciprocating said bafile';said reciprocating means being synchronized with. the material carrying elements of'the elevator.

7. A building construction elevator comprising an elevator boot structure, a tail shaftmounted in said-boot structure, a guiding idler wheel'rotatably mounted 'on -the tail shaft, take-up devices mounted on the boot structure and in which the tail shaft is mounted,'beams providinga platform adapted to be positioned at' the=top of a building,;a head shaft rotatably mounted onsaid beams, a sprocket on said head shaft, power means for: rotating the head shaft, a chain having material carryingelements thereon trained over the sprocket of the head'fshaft and idler wheel of the tail shaft, guiding elements'secured to the boot structure and beams and spaced from. sides of the chain, said guiding elements positioned tobe engaged by. ends of"elongated"objects carried by the chain, a reciprocating bafile positioned between the beams, a hopper depending from the beams and positioned to receive material from the baffle, a pitman arm connected to-the battle and eccentrically connected to'the head shaft of the elevator whereby the baffle moves inwardly, to receive products from the material carrying elements of the elevator and outwardly to permit said elements to pass; and a ratchet assembly associated with the pitman arm for preventing reverse movement thereof.

8. A building construction elevator comprising an elevator boot structure, a tail shaft mounted in said boot structure, a guiding idler wheel rotatablysrnounted on the tail shaft, take-up devices mounted on the boot stmc ture and in which the tail shaft is mounted, beams pro= viding a platform adapted to be positioned at the top of a building, a head shaft rotatablymounted on said beams, a sprocket on said head shaft, power means forrotating the headshaft, a chain having materialicarrying' elements thereon trained over the sprocket of thehead shaft and idler wheel of the tail shaft;- a reciprocating. baffle mounted between the beams, a pitman arm connected to the baffle and eccentrically connected to-the' head shaft for actuating the bathe to a position for receiving products from the material carryingelements of the elevator and for withdrawing. said bafiie to permit passage of said material carrying elements, guide cables secured to the boot structure and beams and spaced from sides of the chain, said guide cables positioned to be engaged by ends of elongated" objects carried by thechain, and a ratchet mountedon the headtshaft' and positioned to be engaged by a pawl on a side beam-of the platform for preventing the chain traveling in reverse.

9. A building construction elevator comprising an elevator boot structure, a tail shaft mounted in said boot structure, a guiding idler wheel rotatably mounted on the tail shaft, take-up devices mounted on'the boot structure and in which the tail shaft is' mounted, beams providing a platform adaptedto be positioned at the top of a building, ahead shaft rotatably mounted on said beams, a sprocket onsaid headshaft, power means forrotating the head shaft, a chain having material carry ing elements thereon trained over the sprocket of the head shaft and idler wheel of the tail shaft, said material carrying elements being adapted to fold to positions against the chain in the return travel thereof downwardly with the chain, a horizontally disposed reciprocatingbaifie mounted between the beams, the baflie being"actuated by the head shaft of the elevator whereby "the battle is moved inwardly to receive products from' the material carrying elements and outwardly to permit said material carrying elements to pass guiding elements secured to the" boot structure and beams and spaced from sides of'the chain, said guiding elements positioned to be engagedby i ends of elongated objects carried by the chain, and means 9 for preventing reversing movement of the chain of the 375,293 elevator. 834,883 842,657 References Cited in the file of this patent 1,109,408 UNITED STATES PATENTS 5 1,171,088 146,847 Stewart et al Jan. 27, 1874 2,6859

10 Humphrey Dec. 20, 1887 Beach 1 Nov. 6, 1906 Harper Jan. 29, 1907 Eshleman Sept. 1, 1914 Burkhart Feb. 8, 1916 Schlesinger Aug. 10, 1954

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