US1453227A

US1453227A - Scaffold

Info

Publication number: US1453227A
Application number: US515244A
Authority: US
Inventors: William J Murray
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-11-15
Filing date: 1921-11-15
Publication date: 1923-04-24
Anticipated expiration: 1940-04-24

Description

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' hanger stirrups 13 secured, at their Watentetl ihpri dd Wild.

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application filed 1t ovemhcr To all whom it may concerns" Be it known that l, WiLniaM ll. MURRAY, a citizen of the United @tates, and a resident of'llllamaroneck, in the county of West chester and State of New York, have in vented a new and linproved @caffold, of which the following is a description.

My invention relates to scaffolds adapted to be suspended on a building to be raised or lowered as desired.

The general object of my invention is to provide a novel raising and lowering means of simple construction adapted to wind in and pay out the suspending ropes or cables in the raising and lowering of the scaffold, the invention having in view especially to promote convenience in the operation of raising and lowering the scaffold and to insure safety and positively and automatically? 4,29. 'lihe drive 28 and said shaft is adapted to have axial preventing the accidental dropping of the scaffold at one or hothends.

The nature of the invention and its distinctive features and advantages will more clearly appear as the description proceeds.

Reference is to he had to the accompanying drawings forming a part of this specification, it being understood that the drawings are merely illustrative of one example of the invention.

F igure 1 is a front elevation of a scaffold suspended from the roof:

l igure Q is an enlarged side elevation of the raising and lowering means, the scaffold proper being in transverse vertical section;

Figure 3 is an elevation at right angles to Figure Q;

ll igure dis a detail in vertical section adjacent to one end of the drum operating shaft.

' in carrying out my invention the platform of the scaffold any approved form, here shown as comprising a ladder 11 having planks laid on the ladder rungs 12. 'lhe platform 10 rests in upper ends by bolts 14 to the parallel terminals 15 on the frames 16 of the hoisting and lower ing units.

sits the two hoisting and lowering units of the scaffold are alilre, it will sudice to describe one. Each hanger stirrup 13 is formed from strip metal the sides of which in practice may be of are upwardly convergent and the upper tor are parallel and receive a minals of which transverse bolt ll having a lever nut 18 for lit, ltlill. ilerial lilo. hlllfill t.

tightly clamping the sides of the hanger against thebolts 1t which lie above and below the bolt 17 at right angles thereto.

The suspension cables 19 are here shown its having hooks 20 at their upper ends to hoolr over a cornice it. lit will be understood that any expedient may be adopted for fastening the upper ends of the suspension cables. Each cable 19 runs over an idler sheave 21 on a shaft or tie rod 22 at the up per end of the frame 16 and from said sheave to a winding drum 2?, the shaft 24tof which is tnrnahly mounted in said frame 160 tln the drum shaft is a gear wheel 25 over which advantageously a housing 26 may he provided on frame 16. The gear wheel 25 meshes with a drive pinion 2'? on a counter shaft Q8 having hearings in the frame 16, said drive shaft 28 having a cranlr handle pinion 2'?! is fast on the shaft inovement in the frame 16 in addition to its turning movement whereby an axial movement of the shaft will shift the pinion 27 thereof into or out of engagement with a clutch 32'fixedly secured by rivets 33 or the like to the frame 16, said clutch and said pinion 27 having mating clutch teeth 31 it compression spring is coiled about the shaft 28 at a side of the frame opposite the clutch 32, the said spring abutting at one end against the frame and abutting at its other end against the collar 30" on the shaft 528 so that the spring tends to maintain the shaft in position with the pinion 27 engaging the clutch 32 to prevent turning of the shaft 28 and thereby preventing turning of the drum Turning with the drum shaft 24L is a ratchet wheel 34 engaged by a pawl 35 for preventing retrograde movement. Thus, the pawl 35 will hold the drum against turning after the pinion 27 is released from the c utch but will slip over the ratchet 34L in the turning of the drum in response to the turning of the .drive shaft 28 and pinion 27. v

it would state in conclusion that while the illustrated example constitutes a practical embodiment of my invention, l do not limit myself strictly to the exact details herein illustrated, since, manifestly. the same can be considerably varied without departure from the spirit of the invention as d fined n the appended claims.

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2. ln a Windlass of the character 'de- 15 scribed, a frame, a drum revolubly carried by said frame, a driven gear on said drum, a drive shaft carrying a pinion meshing with said gear revolnble and movable axially in said frame, and fixed clutch members on 20 said frame engageable and disengageable by said pinion by an axial movement of the drive shaft;

' WILLIAM J. MURRAY.