US2673711A

US2673711A - Lift assembly for mounting on scaffolding

Info

Publication number: US2673711A
Application number: US253719A
Authority: US
Inventors: Clifford L Lutton
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-10-29
Filing date: 1951-10-29
Publication date: 1954-03-30
Anticipated expiration: 1971-03-30

Description

March 30, 1954 c. 1.. LUTTON 2,673,711

LIFT ASSEMBLY FOR MOUNTING ON SCAFFOLDING Filed Oct. 29. 1951 3 ShQQtPShGQt l Q) Q Q N I Q Fig. 9

Q I w \w a :e & I Q E Q (g s w 3 iii q .3 Clifford L. Luffon N INVENTOR.

Fig.1

March 30, 1954 c. L. LUTTON LIFT ASSEMBLY FOR MOUNTING ON SCAFFOLDING Filed Oct. 29, 1951 3 Sheets-Sheet 2 Clifford L. Luffan Y INVENTOR.

BY adynwym March 30, 1954 c. L. LUTTON 2,

LIFT ASSEMBLY FOR MOUNTING 0N SCAFFOLDING Filed on. 29, 1951 s Sheets-Sheet s Clifford L. Lutfon IN VEN TOR.

Wadi-M Y MMZ5.%

Patented Mar. 30, 1954 LIFT ASSEMBLY FOR MOUNTING ON SCAFFOLDING Clifford L. Lutton, Washington, D. 0.

Application October 29, 1951, Serial No. 253,719

9 Claims.

, This invention relates to a lift assembly and particularly to a lift to be mounted on scaffolding for building construction or maintenance.

' In the construction and maintenance of buildings, it is frequently desirable to have workmen suspended at various heights on the wall or other portions of the building. A sectionalized scaffolding support has been constructed which will allow workmen to construct scaffolding of any height or to be reached through any portion of a building. While working on such scaffolding, it is frequently desirable to elevate building materials, tools or other material onto the scaffold. Heretofore, such material has usually been lifted to the platform by means of ropes operated by the individual workman on the platform. It has long been recognized as desirable and many attempts have been made to produce lift devices operated from power sourceson the ground for lifting material onto temporary scaffolding.

I The present invention provides a lift assembly in which laterally extending arms are rigidly mounted on each of the upright standards of the scaffold and a sheave is mounted at the end of the arms so that a running line may be run through the sheaves and attached to a lift in the form of a power driven winch on the ground adjacent to the scaffolding. Pulleys are freely mounted on the running line between each of the sheaves and a retriever line is dropped to the ground so that a workman on the ground may pull the pulley down to the ground and attach a load, after which the winch will tension the running line and elevate the load to the workman on the top of the scaffold.

It is accordingly an object of this invention to provide an improved lift for scaffolding. It is a further object of this invention to provide a power driven lift for elevating material onto scaffolding. "It is a further object of this invention to pro vide a means for attaching a lift to the top of scaffolding.

It is a further object of this invention to provide a lift means having rigidly spaced sheave mounts for operating a running line to lift material onto the scaffold.

Other objects and many of the attendant advantages of this invention will be apparent from the following detailed description taken in con- 2 Figure 3 is an end elevation of a scaffold showing the assembly of the parts of the hoist on the scaffold;

Figure 4 is an enlarged perspective view of the base and attachment member of the hoist;

Figure 5 is an enlarged fragmentary top plan view showing the attachment of the brace to a scaffold;

Figure 6 is an enlarged cross sectional elevation through the arm and sheave attaching members, taken substantially on the line 6-6 of Figure 3;

Figure 7 is an exploded view, showing the mounting of the sheave;

Figure 8 is an enlarged perspective of the sheave attaching member;

Figure 9 is a perspective view of the rigidifying brace for maintaining the sheave mounting memhers in rigidly spaced relation to each other;

Figure 10 is an enlarged view partially broken away and in section showing the mounting of the lower pulley; and

Figure 11 is an enlarged perspective view of the load attaching pulley.

In the exemplary embodiment, a scaffold indicated generally at iii, has attached thereto the improved lift indicated generally at l2.

A satisfactory scaffold comprises a plurality of pre-assembled, pre-attached, individual sections it and, as best shown in Figure 3, these sections (4 each comprise a pair of vertically extending standards i6, 13 which are rigidly attached to each other by cross members 21'! and 22. The standard members It and I 8 are preferably of a tubular construction, the top end thereof having telescoping pins 2d and 26. A scaffold of any height may be assembled by telescoping the standards l6 and [8 onto the

pins

24 and 26 of a lower section. Pairs of standards produced by this telescoping arrangement are laterally separated by any desired distance so that load membe'rs'28 and 36 may be mounted on the cross members 22 or .2 3 or intermediate cross pieces 32. Obviously; any desired number of the cross pieces 32 may be utilized and they may extend completely across the members it and 18 or they may extend partially across and be supported in the middle by means of a vertically extending member 34. The sections Hi are longitudinally separated at any desired distance and are rigidly held in this spaced relation by means of cross braces 36 for detachable connection between the adjacent sections M. This construction provides a scaffold having a plurality of longitudinally rigidly spaced vertical- 1y extending standards l8, to which is rigidly attached cross members and 22.

The hoist I2 includes a beam 40 rigidly attached to the base by one of the pairs of columns by any suitable means such as U-bolts 42. The beam 40 may conveniently be constructed of an angle iron having a flat side 44 secured against the standards I6 and I8 and a laterally extending top flange 46 having an opening 48 therein, in which is mounted a screw fastener, such as a bolt 50, on which is journaled a frame 52 of a pulley sheave 54, and the frame 52 is extended laterally alongside of the sheave 54 to provide a line guideso that a rope or line mounted on the sheave 54 will be prevented from jumping off the track of the sheave.

The top portion of the lift includes a brace member indicated generally at 56 and a sheave attaching member indicated generally at 58. The brace member 56 includes a laterally extending arm 60, preferably of angle construction, having a downwardly extending flange 62 and a horizontally extending flange 64. A base member 66 is rigidly connected to one end of the arm 60 and extends at right angles thereto. The base member 66 may be constructed either as an angle or as a channel member, as may be desired. A brace member 68 extends from the lower end of the base member 66 to a point adjacent the outer end of the arm 60. The brace member 68 is rigidly and permanently attached to both the arm 60 and the base 66. Suitable fingers III are mounted on the base member 66 and extend laterally therefrom to engage the standard I 8. A connecting member I2 comprises a bar 14 rigidly attached to the side flange 62 of the arm 60 and extending longitudinally beyond the end of the arm 60, an angle member I6 rigidly attached to the bar I4 and has a top laterally extending portion 18 spaced from the end of the arm 60 a sufllcient distance to provide a notch 80 for receiving the upstanding pin 26 of the standard I8 and contact of the portion I8 with the side of the standard pin 26 maintains the arm against lateral displacement from the standard I8. Downwardly extending portion 86 of the hook portion 82, extends over and embraces cross member 22 to prevent vertical displacement of the brace member along the standard I8.

A sheave supporting member 58 is preferably constructed from a channel member and has a downwardly extending flange 86 and a horizontally extending flange 88 respectively overlying the vertical flange 62 and the horizontal flange 64 of the brace arm 60. A downturned flange 90 is inturned at 92 to provide a hook member engaging the edges of the horizontal flange 64, as best seen in Figure 6.

An axle rod 94 is rigidly connected to the flange 86 by any suitable means, such as welding 86.

A plate member I has a transverse opening I02 therein and is mounted on the rod 94 and rigidly connected thereto by any suitable means, such as welding. The upper edge of the plate I00 is turned over to provide an angle portion I 04 and journaled on the shaft 94 is a sheave I06. A second plate I08, provided with an opening H0, is freely mounted on the shaft 94 and the plate I08 has a flange II2 which overlies the flange I04 and the flanges I04 and H2 are secured together by any suitable means, such as the screw fasteners I I4. Plates I00 and I08 closely embrace the sheave I06 and together with the flanges I04 and H2 provide a line guide for maintaining a line in contact with the sheave I06.

In order to maintain the brace and mounting

members

56 and 58 rigidly spaced with regard to each other, each of the sheave mounting means is provided with pins H6 and H8 rigidly secured to the top flange 88 of the sheave mounting member 58, a brace member I20, including a pair of rod members I22 and I44, are rigidly connected together in the middle by means of suitable means such as a rivet I26. The ends of the rods I22 and I24 are provided with eyes I30 for engaging the pins H6 and H8. Application of the brace I20 between adjacent pairs of bracing and attaching means rigidly space these means with respect to each other so that the application of the load between them will have no tendency to cause the brace members to sag together.

The running line I has a portion thereof wound on the drum I42 of a winch I44, having a driving motor I46 operatively connected to the winch I44. The line I40 extends from thedrum I42 through the pulley 54 which is mounted on the beam 40 immediately below the sheave I06 mounted at the top of the standard I 8, thence through the various sheaves I06 downwardly to a safety weight I56. Preferably, the safety weight I50 just exceeds in weight the maximum load that it is intended to raise by the lift. In'this manner, any overrunning of the winch I 44 will not cause undue stresses to be applied to the scaffold. Tensioning of the rope I40 by means of the winch I44 will thus raise any load that may be attached to the pulleys I52 freely mounted on the running line I40 between each of the sheaves I06 and if any of the tension should exceed that necessary to raise the load, it will be applied to lift the safety weight I50 and thus prevent undue strains on the structures until the motor can be shut off.

Each of the free running pulleys I52 comprises a frame I54 in which is mounted a sheave I 56 and preferably the frame I54 extends laterally to the sides of the sheave I56 to provide a line guide to maintain the rope or other flexible cordage within the groove of the sheave I56. .A plurality of attaching hooks I58 are connected to the frame I54 and may be arranged in any desired formation which is convenient to lift various articles from the ground to the platform. Usually, a retriever line I60 is connected to each of the pulleys I52 so that the pulley I52 may be pulled down to the ground to receive a load.

In order to prevent an unduly heavy load from moving the winch I44 or the scaffolding it is desirable to anchor the winch I44 with respect to the scaffolding and for this purpose braces I62, I64 are connected with the front corners of the winch to adjacent portions of the scaffolding and preferably are cross-connected and secured firmly together by means of a clamp I66 In the operation ofthe lift according to the construction, the scaffold is built to the necessary height after which the

platforms

28 and 30 are put in place. The brace members 56 are placed in position at the top of the standard I8 and the sheave attaching members 58 are attached thereto. The members 58 are prevented from sliding or otherwise being displaced longitudinally on the brace 56 by means of an upturned stop I10. The line I40 may be threaded through the sheaves I06 either before or after they are placed in position. To apply a load to the load lifting pulleys I52, the motor I56 is deenergized and the retriever line IE0 is utilized to pull the pulley I52 to the ground lever; at which time any variety of load may be attached to the hooks I58. The motor is then energized to tension the line I40 which lifts the load pulleys I52 to substantially horizontal relation to the sheaves I06 so that workmen in the top position of the scaffold may remove the load from the pulleys. Any overrun of the motor may be compensated by means of the safety weight I50 which will be lifted sufiiciently to permit the excessive tension to be relieved.

.While for purposes of exempiification, a particular embodiment of the invention has been shown and described according to the best pres-- ent understanding thereof, it will be apparent to those skilled in the art, that many changes and modifications can be made therein, without departing from the true spirit of the invention; Having described my invention, what is claimed as new is:

' 1. A hoist arrangement for use on a building scafiolding comprising a plurality of spaced apart sheave supports adapted to be mounted on the top of a scaiT-old, a sheave journaled on each of said supports, a pulley adapted to be mounted at the base of a scafifold. a winch, a running line on said winch and extending through said pulley and said sheaves in series relation, a load pulley freely mounted on said line between said spaced apart sheaves, the free end of said line being attached to a counterweight.

2. A hoist for lifting building material to a scaffold having laterally spaced vertical standards and vertically spaced horizontal cross members comprising: attachment members adapted to be mounted on said standards, each of said attachment members including a laterally extending arm, a channel member rigidly secured to said arm substantially perpendicular thereto, a brace between said arm and said channel iremberjme'ans on said channel member embracing one of said vertical standards, a channel shaped hook rigidly mounted in spaced relation to said arm, said hook engaging one of said cross members adjacent to said one vertical standard, means for supporting a sheave at the end of said arm, a sheave mounted adjacent the base of said scaffold, a running line extending through said sheaves, a load engaging pulley mounted between said sheaves on said arms, a counterweight attached to one end of said line, a winch attached to the other end of said line.

3. A hoist for attachment to a scaffold having a plurality of pairs of spaced apart supporting standards, laterally extending cross members secured between the standards of a pair of standards, brace members maintaining said pairs of standards in predetermined spaced relation, said hoist comprising a sheave support at the top of each pair of standards, each sheave support including a laterally extending anglememher, a base member rigedly secured in perpendicular relation to one end of said angle member, a brace extending between the outer ends of said base and said angle member, an angle shaped hook member rigidly attached to said angle member and spaced from the end attached to the base, a portion of said hook member engaging the side of one of said pair of standards, another portion of said hook engaging one of said cross members, fingers on said base engaging said one of said pair of standards, a sheave attaching member secured on said angle memher, a shaft rigidly secured on said attaching member, a portion of a rope guide rigidly connected to said shaft, a sheave journaled on said shaft, a second rope guide portion engaging said shaft and detachably secured to said 'first mentioned rope guide portion, a beam secured to an end pair of standards, a pulley pivotally mounted on said beam in vertical alignment with the sheave mounted at the top of said pair of standards, a Winch, a line attached to said winch, said line extending through said pulley and said sheaves, the end of said line being connected to a counterweight, load engaging pulleys freely mounted on said line between said sheaves.

4. A hoist for elevating building material onto a scairold having spaced apart pairs of standards, said standards having rigidly secured cross members extending therebetween, said hoist comprising a brace member on each pair of standards, hook means for attaching said brace member to a standard of said pair of standards and to one of said cross members, a sheave support detachably supported on said brace member; a'rope guide mounted on said sheave support, a sheave in said guide, a beam rigidly secured on the base of an end pair of standards, a pulley swivelly mounted on said beam in vertical alignment with the sheave carried at the top of said end pair of standards, a running line extending through said pulley and said sheaves, load engaging pulleys freely mounted on said line between said sheaves mounted on said sheave supports, the end of said line extending through the pulley mounted on said beam being operatively connected to a winch, the other'end of said line being connected to a counterweight, means for anchoring said winch with respect to said scaffold.

5. A hoist for attachment to a sectionalized scaffold support having spaced apart, aligned, sectionalized standards, platform supporting cross members onsaid standards and rigidifying members spacing said standards, said hoist comprising an arm for engaging one of said standards and one of said cross members in interlocking relation, brace means maintaining said arm in substantially perpendicular relation .to said itandard, said arm being an angle membena sheave attaching member, said sheave attaching member including an angle member overlying said angle arm, the edge of said overlying angle being inturned to interlock with said arm, a stop on said arm to prevent longitudinal displace;-

merit of said overlying member, a sheave axle mounted on said overlying member, a sheave journaled on said axle, a pair of upstanding pins on said overlying member, cross braces mounted on the pins of adjacent overlying members to provide a rigid hoist structure.

6. A hoist for attachment to a sectionalized scafiold support having spaced apart, aligned, sectionalized standards, platform supporting cross members on said standards and rigidifying members spacing said standards, said hoist comprising an arm for engaging one of said standards and one of said cross members in interlocking relation, brace means maintaining said arm in substantially perpendicular relation to said standard, said arm being an angle member, a sheave attaching member, said sheave attaching member including an angle member overlying said angle arm, the edge of said overlying angle being inturned to interlock with said arm, a stop on said arm to prevent longitudinal displacement of said overlying member, a sheave axle mounted on said overlying member, a sheave journaled on said axle, a pair of upstanding pins on said overlying member, cross braces mounted on the pins of adjacent overlying members to provide a rigid 7 hoist structure, means for mounting a pulley on the base of the end standard of said scaffold support, a winch adjacent said end standard, brace means positioning said winch with respect to said scaflfold support.

7. A hoist for attachment to a sectionalized scafiold support having spaced apart, aligned, sectionalized standards, platform supporting cross members on said standards and rigidifying members spacing said standards, said hoist comprising an arm for engaging one of said standards and one of said cross members in interlocking relation, brace means maintaining said arm in substantially perpendicular relation to said one standard, said arm being an angle member, a sheave attaching member, said sheave attaching member including an angle member overlying said angle arm, the edge of said overlying angle being inturned to interlock with said arm, a stop on said arm to prevent longitudinal displacement of said overlyin member, a sheave axle mounted on said overlying member, a sheave journaled on said axle, a pair of upstanding pins on said overlying member, cross braces mounted on the pins of adjacent overlying members to provide a rigid hoist structure, means for mounting a pulley on the base of the end standard of said scaffold support, a winch adjacent said end standard, brace means positioning said winch with respect to said scaffold support, a running line, said line attached to said winch and extending through said pulley and said sheaves, a counterweight adjacent the end standard remote from said pulley, the free end of said line being attached to said counterweight.

8. A hoist for attachment to a sectionalized scaffold support having spaced apart, aligned, sectionalized standards, platform supporting cross members on said standards and rigidifying members spacing said standards, said hoist comprising an arm for engaging one of said standards and one of said cross members in interlocking relation, brace means maintaining said arm in substantially perpendicular relation to said one standard, said arm being an angle member, a sheave attaching member, said sheave attaching member including an angle member overlying said angle arm, the edge of said overlying angle being inturned to interlock with said arm, a stop on said arm to prevent longitudinal displacement of said overlying member, a sheave axle mounted on said overlying member, a sheave journaled onsaid axle, a pair of upstanding pins on said overlying member, cross braces mounted on the pins of adjacent overlying members to provide a rigid hoist structure, means for mounting a pulley on the base of the end standard of said scafiold support, a winch adjacent said end standard, brace means positioning said winch with respect to said scafiold support, a running line, said line attached to said winch and extending through said pulley and said sheaves, a counterweight adjacent the end standard remote from said pulley, the free endv of said line being attached to said counterweight, pulleys freely mounted on said line between said sheaves, load attaching means on said pulleys.

9. A hoist arrangement for use on a building scaffolding comprising a plurality of spaced apart sheave supports adapted to be mounted on a seatfold, a sheave journaled on each of said supports, a pulley adapted to be mounted at the base of a scaffold, a winch, a running line on said winch and extending through said pulley and said sheaves in series relation, a load pulley freely mounted on said line between said spaced apart sheaves, the free end of said line being attached to a counterweight, said load pulley including a frame, a line guard for retaining said pulley on said line, a plurality of load engaging hooks on said frame, means attached to said pulley and extending to the ground for retrieving said pulley to attach a load thereto.

CLIFFORD L. LUTTON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 322,181 Hursh July 14, 1885 479,423 Hoffman July 26, 1892 728,114 Kelly May 12, 1903 920,930 Dixon May 11, 1909 1,433,018 McMillin Oct. 24, 1922 1,477,229 Northrup Dec. 11, 1923 2,125,830 Uecker et al Aug. 2, 1938 2,191,051 Uecker et al Feb. 20, 1940 2,203,113 Uecker et a1 June 4, 1940 2,342,139 Gleason Feb. 22, 1944