US2488920A - Collapsible hoist - Google Patents

Description

Nov. 22, 1949 J. R. MARTIN, sR

COLLAPSIBLE HOIS'I' 2 Sheets-Sheet 1 Filed Oct. 20, 1947 INVENTOR.

J. ROY MAR UN SR. BY ATTORNEY Nov. 22, 1949 J 5 2,488,920

,COLLAPSIBLE HOIST Filed Oct. 20, 1947 2 Sheets-Sheet 2 INVENTOR.

J ROY MARTIN, SR.

ATTORNEY Patented Nov. 22, 1949 QNETED STATES PATENT OFFICE COLLAPSIBLE HOIST James Roy Martin, Sn, Anderson, S. 0.

Application ()ctober 20, 1947, Serial No. 780,922

4 Claims.

My invention relates to hoists, and more particularly to a hoist for use in roofing operations.

An important object of the invention is to provide a roofers hoist which is well adapted for lifting light loads, and easy to manipulate.

A further object is to provide a hoist which is extremely simple in construction and easy to assemble and disassemble, thus reducing to a minimum the time required to move and set up the hoist.

A further object is to provide a rooiers hoist which is very light, yet strong and durable.

A still further object of the invention is to pro vide a hoist of the above mentioned class which has a boom that can be rotated horizontally through 360 degrees.

Other objects and advantages of the invention 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 employed to designate like parts throughout the same,

Figure 1 is a perspective view of an assembled hoist in use upon a roof, the swinging boom being shown in alternate positions,

Figure 2 is an enlarged fragmentary central vertical section through the swinging boom and associated elements, parts in elevation,

Figure 3 is a view of the hoist disassembled,

Figure 4 is an enlarged fragmentary side elevation of the hoist, one of the base members beingshown in section,

Figure 5 is a fragmentary plan View of the hoist,

Figure 6 is an enlarged fragmentary perspective view of the base, and

Figure 7 is an enlarged fragmentary vertical section through the foot of a brace, and associated elements.

In the drawings, where for the purpose of illustration is shown a preferred embodiment of the invention, the numeral ill designates the roof of a building, or the like, upon which the hoist embodying the invention is mounted for use, as shown in Figure 1. The hoist comprises a base ii, including a pair of elongated horizontal base members i2 and it. These base members l2 and i3 comprise parallel angle iron members or sides it, rigidly connected at their outer ends by transverse braces or straps l5, preferably welded thereto. Similar transverse braces 16 are welded to the angle iron members M at points toward the inner ends of the same. Base plates I! are rigidly mounted upon the angle members it, and disposed between the braces l5 and I6, and outwardly of the longitudinal centers of the base members l2 and I3. The base plates ll carry central upstanding screw threaded studs l8, rigidly secured thereto, and these studs carry nuts IS. The upstanding vertical webs of the sides M are disposed outermost, and serve to stiffen the base members [2 and i3 against bending. Rigidly mounted upon the base member l2, by means of welding, or the like, and disposed at the inner end of such member, and extending laterally therefrom at one side of the same, is a fiat horizontal support plate 20. This support plate 29 engages upon the tops of the vertical webs of the sides M of base member l2, as shown clearly in Figure 6, and is provided with an opening 21, above the transverse center of the base member l2. The support plate 28 extends over the base member l3, and slidably engages a plate or web 22, welded to the sides i l of the base member i3, and flush with the tops of such sides. The plate 22 and support plate 20 have registering openings to receive a pivot bolt 23, carrying a nut 2 The bolt 23 serves to pivotally connect the base members 82 and it at their inner ends, so that they may swing from their open positions of Figure 1, to closed or collapsed positions where they are parallel, as in Figure 3. In the open position, the base members l2 and I3 are arranged at right angles.

Mounted upon the support plate 20, and detachably connected therewith, is an upright vertical column or standard 25, which is preferably cylindrical and tubular. This standard 25 carries an axial depending screw threaded stud 26 at its lower end, and rigidly secured thereto, and the stud 26 engages in the opening 2! in assembly. A nut 27 serves to rigidly clamp the standard 25 to the support plate 23. The standard 25 is provided with an external annular collar or stop 28, near its upper end but spaced downwardly therefrom. The stop 28 is rigidly secured to the standard 25 by welding or the like.

The numerals 29 and 3B designate diagonal braces formed of sections of angle iron. These braces have bottom flattened ends bent to form horizontal apertured attaching feet 3!. The feet 3! receive the studs l8, and the nuts l9 serve to detachably connect the braces 29 and 30 to the base plates H. The top ends of the diagonal braces 29 and 33 have horizontal flat heads 32 rigidly secured thereto, and these heads have circular openings 33 to engage over the top end of the standard 25 in assembly. In assembly, the lowermost head 32 engages the top of the annular collar or stop 28, and the other head 32 engages upon the lowermost head 32, as shown. The diagonal braces 29 and 30 form with the base members 12 and I3 and with the standard 25 a rigid structure.

Rotatably mounted upon the top end of the standard 25 and slidably engaging upon the uppermost head 32, is a cylindrical tubular hub as of a triangular shape boom The boom 35 comprises triangular frame members or sides 36 which are Welded at their inner ends to the pposite sides of the hub These sides 36 converge outwardly, as shown in Figure 5, and are rigidly connected at their outer ends. The sides 38 include top and bottom angle members 3? and 38, and diagonal braces til, til, ll, and 2. The sides 35 are 01' welded construction. The members ill and 33 converge toward their outer ends, Figure 3, and the boom 35 is provided with a vertically disposed ring 23 at its outer end, and rigidly secured thereto. At its bottom end, the tubular hub is provided with an external annular strap welded thereto, carrying a radial extension or it on having an opening ll. The iug is disposed in the same vertical plane as the boom and d rectly beneath the same. Ihe boom is free to rotate horizontally through 360 degrees.

A standard pulley may be attached to the ring 43, as shown, and this pulley; alone is when the hoist is operated manually, in Fig"- ure 1. A second pulley, not sh may be attached to the apertured lug ana used with the pulley it, when the hoist is power operated.

In use the hoist is very easy to assei bio and is well adapted for roofing operations. It is light and may be shifted to the desired position on the roof alter assembly, The longitudinal base members l2 and it have portions which extend outwardly oi the attaching feet 3i, as shown, and suitable weights may be placed upon the outer ends of the base members, shown Figure l, to prevent the hoist from tipping when used.

When assembling the hoist, the hinged base members are swung open to their positions of Figure l, where they are disposed at ri ht angles. The standard 5 is then mounted upon the plate and secured in place with the nut 2 The heads 32 of diagonal braces 23 and 3d are then slipped over the top end of the standard 25 and engage upon the stop 28. The attaching 3| are then secured i place by mes s of st ds 1% and nuts i9. Fina-ll the boom is mount-2d upon the upper end of the standard, and the hoist is ready for use.

When disassembled, the hoist is Well adapted to be transported and the parts comprising the hoist are light.

It is to be understood that the form of the invention herewith shown and described is to be taken as a p5eferred example or" the same, and that various changes in the shape, size and arrangement of parts may be resorted to, Without departing the spirit of the invention or the scope of the subjoined claims.

Having thus described the invention, I claim:

1. A rooiers hoist, comprising elongated base members adapted to be disposed substantially at right angles to each other, a support member secured to the inner end of one base member and projecting laterally therefrom and having an opening, means pivotally connecting the support member to the inner end of the other base member, a substantially vertical standard detachably mounted upon the suppo member and including a part to engage in the opening, the standard being provided near its upper end with a stop, diagonal braces corresponding in number to the base members, one diagonal brace being detachably connected at its lower end to each base member, each diagonal brace being provided near its upper end with a head having an opening to detachably receive the upper end of the standard above the stop, said heads bearing against the stop, and a horizontally rotatable boom including a tubular hub, the tubular hubbeing adapted to receive the upper end of the standard and to bear against the heads.

2. A collapsible hoist, comprising elongated base members pivotally connected at their ends, a substantially vertical standard mounted upon one base member near the inner end of such base member and including a stop disposed near its top, diagonal braces corresponding in number to the base members, one diagonal brace having its lower end connected with each base member at a point remote from the standard, each diagonal brace includ ng a head at upper end having an to receive the upper end of the above the stop and to bear against the stop, and a horizontally rotatable triangular shaped boom incl ding sides which converge outwardly and a tubular hub to receive the upper end of the standard above the heads of the braces and to bear against the heads, the boom being removable from the standard in an upward direction.

3. Al collapsibl hoist, comprising elongated base members adapted to be disposed at right angles to each other, a mounting plate secured to one base member .Sar its inner end and pivotally connected with the other base member near the inner end of such base member, the mounting plate being provided with an opening, a substantially vertical standard dctachably mounted upon the mounting plate and including a stud mounted wit in the opening, a nut carried by the stud, a secured to the standard near its upper end, diagonal braces, each diagonal brace being provided near its lower end with a foot and near its upper end with a head having an opening, one being detachably secured to each base member at a point remote from the standard, the opening of each head receiving the upper end of the standard above the collar, a triangular shaped boom including a tubular hub detachably mounted upon the upper end of the standard above the collar, the tubular hub bearing against the heads of the diagonal braces, a ring secured to the outer end of the boom, and a pulley supported by the ring,

1. A collapsible hoist, comp-rising base members, each base member including a pair of Iongitudinal spaced a support plate arranged above and secured to the sides or" one base member near the inner end of such base member and having an opening disposed between the sides of such base member, the support plate extending laterally beyond the base member to Which it is attached and pivotally connected with the inner end of the other base member and extending over the other base member, a base plate arranged near the outer end of each base memher and dispose, between the sides of such base member and having an op ning, diagonal braces, each diagonal brace being provided at its lower end with a substantially horizontal apertured foot and provided at its uppe d with a substantially horizontal head having an opening, a substantially vertical standard mounted upon 2,488,920 5 the support plate, a stud carried by the lower REFERENCES CITED end the standard and passmg through the The following references are of record in the opemng 0f the support plate, a nut earned by file of this patent. the stud, a stop carried by the standard near its upper end, one foot being arranged adjacent to 5 UNI D S AT S PATENTS each base plate, a bolt extending through the Number Name Date op ning of each base plate and through the ad- 1 130 766 sasgen Man 9, 1915 jacent apertured foot, the opening of each head 1650:656 sasgen NW 29 1927 receiving the upper end of the standard above 856,907 Chapman May 1932 the stop, and a boom having a tubular hub re- 10 ceiving the upper end of the standard above the stud.

JAMES ROY MARTIN, SR.

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