US32265A - Andrew mouse - Google Patents

Andrew mouse Download PDF

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Publication number
US32265A
US32265A US32265A US 32265 A US32265 A US 32265A US 32265 A US32265 A US 32265A
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Prior art keywords
platform
blocks
levers
chain
andrew
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Expired - Lifetime
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/22Lazy-tongs mechanisms

Description

` oNiTED STATES PATENT OFFICE.,

-ANDREw MORSE, or PORTLAND, MAINE, ASSIGNOR To HIMsELr AND IRA wINN, OE

- SAME PLACE.

EXTENSION-PLATFORM.

Specification of Letters Patent No. 32,265, dated May 7, 1861.

To all whom it may concern:

Be it known that I, ANDREW MORSE, of Portland, inthe county of Cumberland and State of Maine, have invented` a new and Improved ,Adjustable or Extension Platform; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had `to the accompanying drawings, making a part of this specification, in which- Figure l is a corner elevation and half Section of the improved adjustable or eXtension platform when the parts are in a closed state. Fig. 2, is a side view of the adjustable or extension platform showing the same when the `parts are in an open State and the platform is at its `highest point of elevation.

Similar letters of reference indicate corresponding parts in both figures.

This invention is an adjustable or extension platform, intended for the use of painters in working on the outside of buildings. Or it may be used by firemen in cases of fire as a means of escape from elevated points, or for any vpurpose to which it may be found useful.

To enable those skilled in the art to fully understand my invention I will proceed to describe its construction and operation.

A, A, A, A, are four slide ways arranged so as to radiate from a center, from which center proceeds up perpendicularly, a pedestal B, with three grooved pulleys a, a, and ZJ, in its upper end the axis of two of whichiare at right angles to the other (b). The Slide ways have T shaped rails, on which the four blocks C, C, slide, toward and from the central pedestal B, simultaneously; to each of these blocks are jointed two extension-levers D, D, and the upper ends of each pair of these levers are' jointed to pulley .blocks c, c, in which are pivoted horizontally, grooved pulleys over which the pulley chain E, passes.

VVith the jointed eXtenSionlevers a quadrilateral framework is made, which may be composed of any `suitable number of levers all jointed together so as to open and close harmoniously; and on top of this framework a platform G rests which has on its under side four horizontal slotted guideways A',l A', A', A', which are parallel with the slide ways A, A, A, A, at the base of the frame. Into the slots of ways A, A, work pins, having T heads, which are attached to blocks F, F, F, F, to which the ends of the uppermost pairs of levers D, D, are jointed. To the top of these right angular Slotted pieces A', A', the platform G, is bolted. Each pairof extension levers D, is composed of three bars two of which are put parallel together and the other works between these two so that when the platform G., is down `as far as it will go the edges of the levers will t snugly together and occupy comparatively very little space. It will be Seen from this description that this quadrilateral extension jointed framework may be extended or contracted and that as the ends of'the levers of each side. of the frame are all jointed together the platform will be kept in a horizontal position while the levers are distended, or when they are brought together. j Therefore by moving the blocks C, C, C, C, toward the pedestal B,

the ends of all the levers D, D, will be drawn voperate these levers I attach to one of the blocks C, a flanged drum or windlass H, and two hand cranks H, H, with a ratchet wheel and pawl d, c. Around the drum H, passes a chain E, which chain passes around pulleys that are pivoted in the sliding blocks C, and from these blocks the chain is carried to pulleys in the corner blocks c, 0 c, and from one of these blocks to the other the chain passes, until it arrives at the sliding blocks F, F, F, F, when it is crossed diagonally from one of these blocks to the other and finally it is attached to a drum J, on top of the platform G. The chain E in 'together and the platform will be elevated j passing diagonally across the under-side of l the platform, passes through a hub K, which is fixed to the center of the platform, in which hub are four pulleys g, g, g, g, which are pivoted in the slots through which the chain passes.

A hole is cut through the center of the platform and also through the hub K, large enough to admit the pedestal B, and as the chain is crossed in the center of this hole it will be taken by the 4pulleys on the end of the pedestal when the platform is below the end of the pedestal as'shown in Fig. 1, and in this manner the chain will act on the pulleys a, a, and b, while the platform is below a certain point, and when this platform is high enough to be operated independently of this central support the chain leaves the pulleys.

one of the sliding blocks F, through slots which cut through the platform in a line corresponding to the movement of the block F, to which the arms are attached. This upper windlass is furnished with a pawl and ratchet and crank arms like the lower windlass so that power may be applied either at the top or at the bottom of the frame, or at both places at the same time.

- In winding up the chain on either, or both Saa e5 windlasses, the contractile power is not only applied to both ends of the extension jointed frame but the chain operates upon the ends of each pair of levers with the same force that it does upon the top and bottom ends, of the upper and lower levers in the frame.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is:

lThe arrangement of the pulley standard B, radiating sliding blocks C, and rails A, with the jointed levers D, D, pulley blocks c, hub K, cord E, and windlass H, J, all in the manner and for the purposes herein shown and described.

ANDREW MORSE. Witnesses:

GEORGE H. PERKINS, D. H. INGRAHAM.

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4718519A (en) * 1985-10-21 1988-01-12 Barker Sidney L High lift scissor jack
US20050100024A1 (en) * 2003-11-12 2005-05-12 Sbc Knowledge Ventures, L.P. Layer 2/layer 3 interworking via internal virtual UNI
US20070180073A1 (en) * 1999-11-08 2007-08-02 Boyle Phosphorus Llc Generic quality of service protocol and architecture for user applications in multiple transport protocol environments

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4718519A (en) * 1985-10-21 1988-01-12 Barker Sidney L High lift scissor jack
US20070180073A1 (en) * 1999-11-08 2007-08-02 Boyle Phosphorus Llc Generic quality of service protocol and architecture for user applications in multiple transport protocol environments
US20050100024A1 (en) * 2003-11-12 2005-05-12 Sbc Knowledge Ventures, L.P. Layer 2/layer 3 interworking via internal virtual UNI

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