US1563768A

US1563768A - Automatically-extensible hoisting mast

Info

Publication number: US1563768A
Application number: US566604A
Authority: US
Inventors: Philip H Mallinckrodt
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-06-07
Filing date: 1922-06-07
Publication date: 1925-12-01
Anticipated expiration: 1942-12-01

Description

P. H,. MALLINCKRODT AUTOMATICALLY EXTENSIBLE HOISTING MAST Filed June 7, 1 922 .Fhs. Zn.

INVENTOR Patented Dec. 1, 1925.

UNITED STATES PHILIP I-I. MALLINCKROIDT, F SALT LAKE CITY, UTAH.

AUTOMATICALLY-EXTENSIBLE HOISTING MAST.

Application filed June 7, 1922v Serial No. 566,604.

Salt Lake, and State of Utah, have invented a certain new and useful Automatically- Extensible Hoisting Mast, of which the following, together with the accompanying drawing, forms a full, clear, and exact specification, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an automatically extensible hoisting mast, and its principal o-b'ects are:

*irst. To provide a device whereby a load may be hoisted to a certain desired height, in cases where only a part of that height is available for placing a permanent, rigid, hoisting structure.

Second. To provide means whereby a load suspended from a rope or other wrapping connector, may be hoisted to a pre-deter mined height by pulling on the said rope "from a certain rigid structure which is less in. height than the pro-determined height.

Third. To make it possible to hoist a load from a point below a given point, to a third point above the given point, by simply winding up a rope or other wrapping connector having one end thereof attached to the said load, and the other end attached to a hoisting mechanism located below the given point.

Fourth. To provide a device whereby a load may be moved from one point, to a second point remote from the first point, by the progressive shortening of a continuous rope or other wrapping connector passing over a fulcrum member located between the two said points, the device being so arranged that when the load has reached a nc-determined point of its travel,. a rigid member shall be automatically engaged to furnish a support for the load while the load is being carried to the said second point.

Fifth. To provide a device which shall be simple and durable.

Sixth. To supply an efficient mechanism for the purpose mentioned.

In attainingthe ob1ects outlined above, I provide a mast portion which is fixed, relatively to a second or movable mast portion;

The movable portion may be connected to the fixed portion in any suitable manner, so that there will be a telescoping action between the two. As the top of the movable portion may be mounted one or more rotatable members, such as grooved sheaves or chain wheels, and near the bottom oi the movable member I mountanother rotatable member. At the top of the stationary structure I also mount a rotatable memher; a. wrapping connector, such as a chain or wire rope, is provided for hoisting, and this connector is adapted to be connected to the load in any suitable manner, for instance by a hook, clevis, or other equivalent device. From the load, the rope extends upwardly, over the rotatable member of the movable mast portion, down to the sheave fixed at the lower part of the movable mast portion up again around the sheave at the top of the fixed mast portion, and then down to any suitable hoisting device, such as a chain block or winch.

In winding'up the rope, the load will begin to rise and will be lifted to the top of the movable mast portion, on which is fixed a stop member located at a point somewhat below the sheave; a second stop portion, which may be fixed to the rope at a point somewhat above the load, and adapted to contact the first stop member.. Upon the further winding up of the rope it be gins lifting the movable member, the load of course continuing to move up accompanied by the movable member. The lifting of the load continues to the limit, of motion possible between the two mast portions.

This device is designed especially for lifting loads out of basements opening on to side walkswhere the openings must normally be kept covered and where permanent hoisting structures wouldnot be allowable on account oi. obstructing the sidewalks. Other instances of usefulness will readily oc our to the skilled mechanic.

The present device. furthermight include a plurality of mast sections extensiblyl disposed in relation to each other, and adapted to automatically have the extension travel take place after astop portion located on a rope or chain, which is suitably interconnected with themast portions, has come into contact with a second stop portion located on one of the said mast sections.

The features of this invention on which i the protection of Letters Patent is desired,

Referring tothe drawing, 20 represents a fixed mast portion which may consist of two steel channels spaced apart from each other, as shown in Fig. 1. This mast may be anchored tothe floor 2.1 in any wellknown manner, and thetop ot'the. mast may be anchored to the wall 24 by means of a yoke brace 25.

A movable mast portion 26, which may be made of metallic pipe, may be placed to one side of the fixed'mast 20 and be adapted to travel along the latter in lined lateral relation thereto, by means of the

brackets

27 and 28, each of which may embrace themovable mast; portion, and extend in two branches overlapping the sides of the mast 20. The bracket 27 may carry two traction wheels 30,, which may be-journaled on the pins 81, these wheels being disposed on each side of the mast 20 in a manner to engage the channel members of the mast, between the flanges thereof. clearance is left between the circumferences of the wheels and. theinside surfaces: of the flanges so that the wheels will turn freely on the-pins 31, and so they may contact either one ot the flange surfaces, though in this instance, the disposal of the load, willpull'the wheel 30 towards the flange nearest the movable member 26. Another traction wheel 32 may be rotatably mounted on the pin 34 between the side portions of the bracket 28. The bracket 28 may have lip portions 35 forming guards on each side of the mast and extending inwardly over the flanges th-ereoii to prevent any disengage ment between the bracket 28' and the mast 20. The traction wheel 321112. bear against the flat nieces of the mast channels as a track.

At the top of the movable portion 26 there may be an overhanging arm vtermed of two steel channels .36, which may be attached thereto- .by. pins or bolts .37. I The two channels 8.6 may he connectedby a plate portron-38, which may term the integral, front partofalineebraee .39, which iii-turn may have a foot portion 40 rigidly fae': tened t the mast 2c. ,etweenfthe- .a a

channels 36 may he mounted th sheaves 41, and .452 which. are

A slight amount of and the bottom 6.0 Of the the pins 43 and 44 respectively, the pins being secured in the channels 36. Another chain sheave 45 may be rotatably disposed in the bracket 27 and still another sheave 46 may be rotatably mounted between the channels of the mast 20.

A bracket 47 may be rigidly mounted on the mast 20 and a chain block 48, having the usual book 49, may be suspended from the end of the bracket 47. The chain block need not be particularly described here, further than to state that it may be of the spur-gear type with an internal braking mechanism tor supporting a load at any stage of the hoisting. Such chain blocks are made by various nmnu'tacturers and the general construction and use thereof are well. known.

The operating wheel of the chain block is shown at 50, and'the operating chain at 51. A hook for supporting a load, isshowu at 52, and a load chain at 58, extending from the hook upwardly to and around the chain wheel 41, and; then, in order, to and around the

chain wheels

42, 45 and 46. Inasmuch as the chain blocks named, usually pull. the load chain from the bottom, an idler chain wheel 54 is provided, around which the load chain 53 passes as-it comes. from the chain wheel 46. From the idler 54, the load chain 5-3 passes up into and through the chain block,

In hoisting the load, the operator pulls the hand chain, 51 in the proper direction. thereby starting the book 52 upwardly, and continuing. until the upper part 56 of the hook 52, which forms a stop portion, strikes the plate 36 which forms a second step portion adapted to con-act with the first stop portion 56. A Further pull on the load chain will leave that part of the load chain between the chain sheaves 41 and 45, stationary relatively to the mast portion 26, and will cause the movable portion 26 to move upwardly to any desired height within the capacity of the structure, for in. stance, to the position shown in Fig. 3.

In cases where it is dcsirerfl to bring the load over to either side of the hatchway 57. as indicated by the arrows in 1, this may be accomplished by mounting the mast 20 in such a way (not shown) that it may have an angular movement around its vertical axi instead of mo ting it rigidly as is shown in the p ,sent d T is. however, canbe aeeomplisliec by any skilled mechanic and so forms no. part of my in ention.

It will be noticed that the brackets 2.7 and 28 with app irtenan esmav he aid t form a carriage for moun ng the le t 2 ast. 6:, may 1 .0 m a stop'for the downward t igrel 0 vention is described herein, it is to be clearly understood that the details of the invention may, or may not, be shown in the preferred,

forms; further, that the preferred forms may be considerably varied from time to time, depending upon the circumstances and conditions governing, and governed by, the development of this invention and the arts to which it is incident, so that the scope oi this invention is to be interpreted from the claims in which its spirit is broadly generalized.

Having fully described my invention, what I claim is:

1. In a device of the kind described, a mast portion adapted to movably engage a second mast portion and to be longitudinally guided therealong, a sheave on the said first mast portion, a second sheave on the said 'irst mast portion at a point below the first sheave, another" sheave mounted on the said second mast portion at a point above the said second sheave of the first mast portion, a wrapping connector having one end depending from the first sheave, while the other end extends to, and around, the second. sheave of the first mast portion and around the other sheave ot the second mast portion in the order named; a hoisting meclninism to which the other end oi the w 'apping connector may be attached, a stop portion located on the said wrapping connector at a point below the said first sheave, and a stop portion located on the aid first mast portion at a point between the said first sheave and the said first stop portion.

2. The combination with two mast portions relatively movable to each other longitudinally of a stop portion located on one of the said mast portions, a hoisting mechanism mounted on the other mast portion, a wrapping connector having a free end with a stop portion fixed thereto in operable relation to the first stop portion, the said hoisting mechanism adapted to engage the other end of the said wrapping connector, and a plurality of guide members disposed on both the said mast portions in i such a manner that the said wrapping connector may pass around the said guide members, and the hoisting mechanism, and by winding up the said wrapping connector, shall first cause a travel of the wrapping connector alone, until the said step portions come in contact, and then shall cause a cer tain travel between the said mast portions.

3. A mast, a mast extension arranged for longitudinal movement along the said mast, a guide sheave on the mast, an upper guide sheave and a lower guide sheave on the mast extension, a wrapping connector arranged to pass simultaneously over the said guide sheaves, and a stop on the said wrap ping connector, said stop being arranged to engage the said mast extension at a point of its travel.

4. In combination, a structure, an exten sion arranged to rise above the said structure, a wrapping connector passing operatively from the said structure to the said extension, a guide for said connector on said structure, guides for said connector spaced apart't'rom each other on said extension, a stop at one end of the said connector arranged to engage the extension, and means for drawing the said. connector over the guide on said structure.

In testimony whereof, I sign my name hereto.

PHILIP H. MALLINCKRODT.