US2531346A

US2531346A - Builder's hoist

Info

Publication number: US2531346A
Application number: US760560A
Authority: US
Inventors: Schuchert Oakey
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-07-12
Filing date: 1947-07-12
Publication date: 1950-11-21
Anticipated expiration: 1967-11-21

Description

Nov. 21, 1950 o. SCHUCHERT I BUILDERS HOIST 2 Sheets-Sheet 1 Filed July 12, 1947 ATTY N 1950 o. SCHUCHERT 7 Q 7 2,531,346

BUILDERS HOIST Filed July 12, 1947 2 Sheets-Sheet 2 Patented Nov. 21, 1950 BUILDERS HOIST Qakey Schuchert', Iowa City, lowa Application July 12, 1947, Serial No. 760,560

Claims.

This invention relates generally to hoists and in particular to a builders hoist for lifting materials used in the erection of a building.

An object of this invention is to provide an improved builders hoist.

A further object of this invention is to provide a builders hoist of a knock-down construction capable of being easily handled by one man for transport from job to job and readily adapted for use on structures of widely varyin heights.

Another object of this invention is to provide a builders hoist, including a mast comprised of separably connected sections and a lift movable on the mast, in which an additional section for lengthening the mast can be carried to the top of the mast on the lift, after which the lift is locked against downward movement to constitute a working platform while the additional section is being assembled on the mast.

Still a further object of this invention is to provide a builders hoist having a mast comprised of separably connected interchangeable sections of a construction such that a pulley support is ,connectible to the upper end of the mast for any height of the mast.

A further object of this invention is to provide a builders hoist having a mast which is supported in an upright spaced relation from a structure being erected byconnecting frames connectible between the mast and such structure at a plurality of positions longitudinally of the mast.

Another object .of this invention is to provide a builders hoist. in which a lift carries a rotatable wheelbarrow supporting frame to facilitate handling of the wheelbarrow from a scaffold.

Still ,a further object of this invention is to provide a builder's hoist which is of a simple and rugged construction, capable of being easily and quickly assembled for application to structures varying widely in height, adapted to be knocked down into individual package units for convenient handling by one man, eflicient in operation, and capable of lifting .a wide variety of buildin materials.

A feature of this invention is found in the pro- -vision of a builderfs hoist having a mast cornprised of sections of a like construction capable of being connected end to end. A support, fora cable-carrying pulley, ;is attachable on the upper end of the top mast section. Means are provided to hold a lift in an elevated position, independently of a hoist mechanism therefor. An additional section for the mast, therefore, can he lifted to the top of the mast, and on locking .of the lift against downward movement, the pulley support is removable from the top of the mast and attachable to one end of the additional section, after which such section is connected at its opposite end on the mast. In this operation the lift functions as a stationary working platform. An extension of the mast, as required in the erection of a structure, is thus readily accomplished by utilizing the hoist itself for such purpose.

Yet another feature of this invention is found in the provision of a builders hoist, in which a sectional mast of a metal construction is formed along one side with a series of longitudinally spaced tapped holes. To hold the mast in an upright position adjacent to the Wall of a structure being erected, there is provided a plurality of like frame structures each of which includes a base member capable of bein secured on the wall in a horizontally extended position. A connecting member is pivotally connected at one end to opposite ends of the base member, and carries a bolt at its other end which is threadably connectible with one of the tapped holes in the mast.

Further objects, features and advantages of this invention will become apparent from the fol lowing description when taken in connection with the accompanying drawings, in which:

Fig. 1 is a front elevational view of the builders hoist of this invention shown in a supported relation with the wall of a structure being erected;

Fig. 2 is a side elevational view of the hoist, looking toward the right in Fig. 1, with the structural wall removed for the purpose of clarity.

Fig. 3 is a fragmentary exploded perspective view of a pair .of adjacent connected ends of the sections comprisin the mast;

Fig. 4 is an enlarged sectional detail view taken on the line .4-4 in Fig. '2;

Fig. '5 is a fragmentary detail perspective View showing the connection of the mast with a base section therefor;

Fig. 6 is an enlarged sectional view taken on the line 66 in Fig. 2, with certain parts removed for clarity;

Fig. 7 is a sectional view as seen on the line 'l'! in Fig. 6

Fig. .8 is an enlarged sectional view as taken on the line 8-8 in Fig. 2. showing a connecting frame for supporting the masts from a wall structure being erected;

Fig. 9 is an enlarged sectional detail VllEW on the line fie-9 in Fig. 2, showing the relative assembly of the hoist mechanism with the mast; and

Fig. 10 is a sectional view taken on the line -l 0-|0 in Fig. 9.

With reference to the drawings, the hoist of this invention is illustrated in Figs. 1 and 2 as having a, mast l5, a lift I6 movably supported for up and down movement on the mast, and a hoist mechanism I! for operating the lift, and including a cable la.

The mast i is comprised of a plurality of separably connected sections i9 (Figs. 2 and 3) each of which is of a substantially I-shape in transverse cross section. Each end of a mast section i9 carries oppositely arranged pairs of tube or pipe lengths 2| which are secured, as by welding, to the outer surfaces of the

section side members

22 and 22a at positions within the transverse and longitudinal confines of a mast section i9, such that corresponding tubes 2|, at opposite ends of a section l9, are in alignment longitudinally of the section.

In the assembly of the mast I5 the sections are arranged in an end to end relation, so that the tubes 2| are in coaxial alignment. Bolts 23 are then inserted through each pair of adjacent coaxially aligned tubes 2|. On tightening of the nuts 2e, for the bolts 23, the sections H) are firmly secured together in longitudinal alignment.

Also, as shown in Figs. 2 and 3, the mast sections I9 are provided along their sides 22a with a series of longitudinally spaced tapped holes 26 which terminate in transverse openings 27 formed in the connecting web 28 between the

section side members

22 and 22a. The openings 21 provide for the holes 28 being tapped for a distance corresponding substantially to the thickness of the side members 22a, ior a purpose which will appear later. It is contemplated that each mast section 59 be about six feet long with the end openings 21a, as indicated in Fig. 2, being spaced about six inches from the corresponding ends of he section Hi, and with the remaining intermediate openings 2 being spaced about twelve inches apart. As a result, in the assembled mast l5, each opening 2? and tapped hole 26 is spaced twelve inches apart from a next adjacent opening and tapped hole.

A pulley attachment 3t carried at the upper end of the mast is, for movably supporting the lift cable i8, includes a pulley 28 rotatably carried in a bracket 36 having a base member 32 (Figs. 1, 2 and 4) The base 32 is formed with openings 33 arranged in a spaced relation corresponding to the spaced relation of the tubes 2| at opposite ends of the mast sections iii. In the assembly of the pulley attachment 3G with the upper end of the mast i5, bolts 23 are extended through the openings 33 and through the tubes 2| at the upper end of the mast. On tightening of the bolt nuts 24, the pulley attachment is positively secured to the mast. It will be understood, of course, that this assembly of the pulley attachment at the upper end of the mast I5 will be the same for any height of the mast as determined by the number of mast sections in the mast.

The bottom of the lowermost mast section i9 is secured to a mast base member 36 by inserting bolts 23 through the tubes 2| at the bottom of such lowermost section for threadable connection with tapped openings (not shown) formed in the base member in a spaced relation corresponding to the spaced relation of the tubes 2|.

The mast I5 is supported in an upright position spaced from the wall 35 (Fig. 1) of a structure being erected by the provision of means including a plurality of connecting frames 37 (Figs. 1, 2 and 8). The frames 3? are illustrated as applicable to a brick wall construction, and each frame includes a stationary support or base member 38 of an angle iron construction provided at opposite ends with bearing members 39. The base 38 is secured in a substantially horizontal position on the wall structure 38 by a bolt 4| extendible through a vertical leg 42 thereof and into the mortar 13 between adjacent bricks in the wall 36.

A substantially V-shape pivoted member 44 has the free ends of its legs pivoted at 45 in the bearing members 39 of the base 38 to provide for 'an up and down pivotal movement of the member 44. A bolt 21 extends through the apex 43 of the pivoted frame 44 for threadable connection with a mast section I9 at a tapped hole therein. A collar or spacer member 45 is mounted on the bolt 37 between the member 44 and the side member 22a of a mast section.

By virtue of the spacing of the tapped holes 26 longitudinally of the sections 9, it is apparent that the mast is capable of being supported at any desired number of positions with the wall 36. The pivoted member 44 readily accommodates any variation in the vertical disposition of the bolt ll relative to a tapped opening 26, an its V-shape construction and double connection with the base 38 acts to hold the mast I5 against a tipping movement in any direction.

The lift |6- (Figs. 1, 2, 6 and 7) includes a pair of side frame members 2-9 of a channel iron construction and of a substantially L-shape. The frame members 69 are arranged at opposite sides of the mast i5 such that their long legs 5| extend horizontally outwardly from the side members 22 of the mast sections i9, and their short and a brace plate 54 is connected, also by welding, across the top outer sides of the short legs 52 so as to be spaced outwardly from the mast side members 22 in a plane substantially parallel therewith.

Upright plate members 56, secured to the inner adjacent sides of the short legs 52, and of a length substantially coextensive with such legs, carry vertically spaced stub shafts 5? for rotatably supporting flange rollers 58 at positions arranged to opposite sides of the connecting web 28 of a mast section i9, for contact engagement with the inner surface of the

mast side members

22 and 22a. The rollers 58 and

side members

22 and 22a thus coact to guidably support the lift It for up and down movement on the mast H5.

The cable H3 is movably supported on the pulley 29, intermediate its ends, so that one of its lengths is arranged adjacent to the side members 22a of the sections i9, and the other of its lengths adjacent to the side members 22. The end 59 (Fig. 1) of the cable I8 is of a yoke construetion to provide for its connection at 6| with opposite end portions of the plate member connected between the short legs 52 of the frame members 49.

The opposite end 62 of the cable I8 (Figs. 9 and 10) is connected to a winding drum 63 forming part of the hoist mechanism H. The drum 63 is mounted on the projected end 64 of a shaft aeeiieee 69 which form part of. a speed r du ion unit. designated generally as 61, secured as by bolts 68 to one leg 89 of an angle plate member ll. The other less 2, f the n l memb r is onn cted o th ide m mber 2204 of the low rmost mast section lfiby boltsls extended therethrough and threadably engageable with the mast section at certain of the tapped holes 25 therein.

A d i shaft it. for the speed reduc ion uni It? is conn cted through, a belt l6 with a drive pulley it of an. electric motor it (Figs. 1 and 2). The motor #8 is carried on a frame l9 which is nivotaily supp r f r up and down movement at 65 on the legs 69 of the angle member ii. Pivoted adjustable movement of the frame is, for the purpose of adjusting the tension in the belt it, is accomplished by the provision of a bolt 75 threadably connected at its lower end 85 in a plate member 88 secured to the top of the speed reduction unit 67, and having its upper end pivoted at Til with the frame 79. Thus by merely adjusting the bolt ii, the frame '59 is pivotally ad usted in an up and down direction to vary the tension in the belt T6.

The winding drum 63 is formed of two coaxially aligned sections ti and 32, withthe section iii constituting what shall be hereinafter referred to as a reserve section, and the section 82 as an active section (Figs. 9 and 10).. The sections 8i and 8.2 are separated by a flange member 33 having a notch M cut therein for receiving the cable 58. The amount of live cable to be wrapped about the active section 82 of the winding drum 63 is determined by the working height of the mast 15. In other words, when the mast i is relatively short, only a small length of live cable will be wound about the active drum section 82, and a greater length of cable It will be wrapped about the reserve drum section 8!, with the por tion of the cable l3, indicated as l8a, and extended through the notch orcut 8 defining the termination of the live cable length. By virtue of this construction of the winding drum 63, a relatively long cable l8 can be used on a plurality of jobs requiring different mast heights, without necessitating any cutting of the cable l8.

It is contemplated that the motor 13 be of a reversible type, and the speed reduction unit 6? of a worm gear type, as illustrated in Fig. 9,

so that the operation of the motor will control the rate of travel of the loading platform l8 in its up and down movements. For this purpose a reversing switch, indicated generally as 36 (Fig. 2) is carried on an extended portion 81' of the plate member 80.

From the above description it is seen that the hoist mechanism ll is detachably connected with the mast l5 through the bolts '63. Further, the mast sections I9 are separably connected by means of the tubes 2i and bolts 23 and the lowermost section I9 in the mast is is cletachably connected with the mast base 34 by bolts 23. The connecting frames 3! are detachably connected with the wall structure 35 and the mast 55 through the bolts M and 41, respectively, while the lift it is separable from the mast by merely moving the rollers 58 out of their assembly relation with the mast sections. As a result the hoist is capable of being knocked down into a relatively few number of compact package units which can be easily handled by one man for transport and assembly purposes. The complete hoist, when dis-assembled, can be thus readily carried from job to job in a pickup. truck.

' support 94.

In th use of the hoist the lift it is assembled with th ow most section 19. a t r w ich such ectio v t is assembl d. h th mast. base 34.- e ho me an m t is he connected with the lowermost mas se i n by h bolts 13... The pulley attachment 38, if desired, can be assembled at the upper end of the lowermost mast section for low lift work.

In the assembly of. an additional section 19 on the mast, to increase its height, such additional mast is loaded on the platform 34 and the hoist ll operated to elevate the lift to its highest position on the mast. With the lift thus elevated, a locking pin 89 (Fig. 3) is inserted through the openin 2?, immediately below the lowermost rollers 58. The lift I6 is then lowered by operation of the hoist mechanism until the bottom rollers 58 are supported on the. locking pin 39. The lift I6 is thus positively locked against downward movement, independently of the hoist mechanism [1.

With the lift thus locked, the platform 53 cone stitutes a working platform for the hoist operas tor, whereby the upper end of the mast is easily accessible. The pulley attachment 3% is then re? moved from the upper end of the mast, and the additional mast section, which was previously elevated by the lift It, is assembled and placed on the mast so as to constitute the uppermost section in the mast. Prior to this assembly of the additional mast section, with the erected mastpthe pulley attachment is assembled on one of its ends. With the additional mast in its assembly position the hoist mechanism I1 is again completely operative to raise and lower the lift IS. The hoist mechanism is initially operated to elevate the lift so as to move the lower rollers 58 out of engagement with the locking pin 89.

It is to be understood that this assembly of an additional mast section, with the erected mast i5, is the same for any height of the erected mast. Likewise, successive connecting frames 31 are connected between the mast I5 and a wall structure 36, as the mast is progressively lengthened.

To facilitate the handling of bulk material, such as cement and mortar, which are usually carried in a wheelbarrow, the platform 53 is formed with an open bearing 92 (Fig. '7) at a position intermediate and adjacent to the outer ends of the long legs 5| of the channel side members 49. The bearing 92 is adapted to rotatably receive a stub shaft 93 projected downwardly from the lower side of a wheelbarrow A fiber member or the like 9t, mounted about the shaft 93, is interposed between the underside of the wheelbarrow support 94 and the top side of the platform 53 to retard a free rotational movement of the wheelbarrow support.

As best appears in Fig. 6, the wheelbarrow sup port 94 is of a substantially triangular shape, with n intermediate section 91 of thebase thereof being bent downwardly to form a ramp for the wheelbarrow. The sections 98, at opposite sides of the ramp 91, are upturned at 99 and the apex of the wheelbarrow support 94 is upturned at let to form stops. Thus on running a wheelbarrow up the ramp 9'! on tothe support 94, its wheel is positioned against the stop ml, while its supporting legs are carried on the base end sections 98 adjacent to the stops 99 so as to prevent movement of the wheelbarrow off of the support. 94 during the operation of the lift.

When the wheelbarrow support. 94' isnot in use,

the shaft 93 is merely lifted out of the bearing 92, with the open construction of the bearing preventing any accumulation of material, dirt or the like therein, which interfere with a later assembly of the wheelbarrow support 94 on the platform 53.

From a consideration of the above description it is seen that this invention provides a builders hoist which is of a compact and rugged construction, readily applicable for use in the construction of buildings of widely varying heights, and capable of efiiciently handling bulk and solid building materials. Further, the hoist is of a construction to provide for its being knocked down into a relatively few number of units of a size and weight readily handled by one man for transport and assembly purposes. Also, the lift is fully utilized in the assembly of additional mast sections on an already erected mast. As a result substantially no inconvenience or loss of time is encountered in progressively increasing the height of the mast to accommodate the increase in height of a building being erected.

Although the invention has been described with respect to a preferred embodiment thereo it is to be understood that it is not to be so limited since changes and modifications can be made therein which are within the full intended scope of this invention, as defined by the appended claims.

I claim:

1. A builders hoist including a mast comprised of a plurality of separably connected one piece sections, means for connecting together adjacent ends of said sections, a lift movably supported on said mast for up and down movement, a hoist mechanism carried on said mast, cable supporting unit adapted for detachable connection with either end of a section and carried on the upper end of the top section of said mast, a cable adapted to travel over said unit and operatively associated with said hoist mechanism and lift, means independent of said hoist mechanism for holding said lift in an elevated position against downward movement to provide for an additional mast section being carried upwardly on said lift for assembly with the upper mast section to extend said mast, and means connectible with said sections and a structure being built to support said mast in an upright position.

2. A builders hoist including a mast comprised of a plurality of separably connected one piece sections of a generally I-shape in transverse cross section, means for connecting said sections together including longitudinally extended tubes arranged about the opposite ends of each section and within the planes of the end faces at said opposite ends, clamp means extendible through adjacent tubes, a cable carrying pulley, and means for rotatably supporting said pulley on the upper end of the topmost section in the mast, including a base member having openings therein arranged in a spaced relation corresponding to the arrangement of the tubes at the end of a mast section.

3. A builders hoist including a mast comprised of separably connected one piece sections of a generally I-shape in transverse cross section, a lift, means movably supporting said lift for up and down movement on said mast including rollers guidably arranged between the side portions of said sections at opposite sides of the connecting web therebetween, hoist means for raising and lowering said lift, with one of said side portions having a series of longitudinally spaced tapped holes therein terminating in transverse openings in said web, means insertible through transverse opening and engageable with a roller 0 hold said lift against downward movement independently of said hoist means, and mean connectible with a section at a tapped opening therein and with the structure being erected to support said mast in an upright position.

4. A builders hoist including a mast comprised of separable sections, a lift movably supported on said mast for up and down movement, a hoist mechanism mounted on said mast adjacent the lower end thereof, flexible lifting means having one end connected with said mechanism and an opposite end connected with said lift, means at the top of said mast for movably supporting said lifting means intermediate the ends thereof, and means detachably supported on said mast in the path of movement of said lift for holding said lift in a selected elevated position independently of said hoist mechanism, whereby to relieve said lifting means of any load.

5. In a builders hoist, a mast comprised of a plurality of separably connected one piece sections of a substantially I-shape in transverse cross section, longitud nally extended tubular members carried at the ends of said sections in a predetermined spaced relation, with the outer ends of said tubular members being within the longitudinal confines of said sections, a rotary member for movably supporting a flexible lifting means at the top of the uppermost section, a bracket support for said rotary member including a base member having openings arranged therein in a spaced relation corresponding to the spaced relation of said tubular members, and clamp means extendible through longitudinally aligned tubular members at the adjacent ends of said sections, and through the openings in said base member and the tubular members at the top of said uppermost section.

6. In a builders hoist including a mast, means for supporting said mast in an upright position spaced from a structure being erected including a frame structure comprised of a horizontal member, means for attaching said horizontal member to the structure being erected, a member of a substantially V-shape, a first means pivotally connecting the free ends of the legs of said V-member with opposite ends of said horizontal member, and second means pivotally connecting the apex of said V-member with said mast, with the axes of said first and second means being in a parallel relation.

7. In a builders hoist including a mast, means for supporting said mast in an upright position spaced from a structure being erected including a first member, means for attaching said first member in a horizontally extended position on said structure, a second member having a pair of spaced portions at one end thereof pivotally connected to opposite ends of said first member, and means for pivotally connecting the other end of said second member to said mast, with the axes of the pivotal connections at opposite ends of said second member being in horizontal planes.

8. A builders hoist including a mast comprised of a plurality of separably connected one piece sections of a generally I-shape in transverse cross section, means for connecting said sections together in longitudinal alignment including fixed c'amping members arranged about the opposite ends of each section and within the planes of the end faces at said opposite ends.

9. A builders hoist including a mast comprised of separably connected one piece sections of a generally I-shape in transverse cross section, a lift, means movably supporting said lift for up and down movement on said mast including rollers guidably arranged between the side portions of said sections at opposite sides of the connecting web therebetween, hoist means for raising and lowering said lift, said connecting web having a series of longitudinally spaced transverse openings therein, means insertible through a transverse opening and engageable with a roller to hold said lift against downward movement independently of said hoist means, and means connectible with a section and with the structure being erected to support said mast in an upright position.

10. A builders hoist including a mast comprised of separable sections, a lift movably supported on said mast for up and down movement, a hoist mechanism mounted on said mast, flexible lifting means having one end connected with said mechanism and an opposite end connected with said lift, means at the top of said mast for movably supporting said lifting means intermediate the ends thereof, and means detachably supported on said mast in the path of movement of said lift for holding said lift in a selected elevated position independently of said hoist mechanism, whereby to relieve said lifting means of any load.

OAKEY SCHUCHERT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name mate 1,834,152 Schmid Dec. 1, 1931 2,284,360 Berby May 26, 1942