US1231014A - Hoisting apparatus for scaffolds. - Google Patents

Description

J. E. GOODWILL.

HOISTING APPARATUS FOR SCAFFOLDS. APPLICATION FILED JAN.20| 191 1,28 l ,0 1 Patented June 26, 1917.

2 SHEETS-SHEET I- attoznm J. E. GOODWILL.

HOISTING APPARATUS FORISCAFFOLDS.

APPLICATION FILED JAN-20.19M-

2 SHEETS-SHEET 2.

E STAT JASPER E. GOODWILL, OF OMAHA, NEBRASKA.

HOIS TING APPARATUS FOR SCAFFOLDS. I

Specification of Letters Patent.

. Patented June 26,1917.

Application filed January 20, 1917. Serial No. 143,458.

' Omaha, inthe county of Douglas and State of Nebraska, have invented certain new and useful Improvements in a Hoisting Apparaf tus for Scafiolds, of which the following is a specification.

The invention relates-to a hoist ng apparatus forscaflfolds, and has for its ob ect,

broadly, to provide apparatuses by means of which heavily loaded scaflolds may be readily elevated or lowered, the parts to.be few and simple so that they may be manufactured economically, will be efiicient operation, and durable and convenient n use.

The invention consists of the novel construction, combination and arrangement of parts as described herein and claimed and.

as illustrated in the accompanying -drawing, wherein,-

Figure 1 is a view in side elevation of the apparatus and Fig. 2 is a View of the.

same in longitudinal section, parts of the upper gripping member being disposed in engagement with the cable, .and the parts of the lower gripping member bein shown in disengaged relation with the cab e. Fig.

3 is a view of the apparatus in longitudinal section taken at right angles to the view shown in Fig.' 2, as on line 3 3 ofFig. 2. Fig. 4 is a plan view of one of the operating or hand levers.

Iteferring now to the drawing fora more particular description, numeral 5 indicates alower gripping member, and at 6 is indicated an upper gripping member, each being adapted, normal y, to engage or grip the elongated, upright support 7 by action of the opposed springs 8, and adapted to' be I released from said support by manually pressing upwardly upon a hand-lever, 9.

While the elongated support 7 is shown as a cable, it will be understood that operation of the apparatus would be substantially the same if elongated bars, strap-iron, pipe or strands were em loyed, these supports being of any require length to reach to the top of a wall or building, if necessary, their upper ends in all instances being secured at some distance above the scaflfold 10 which carries the load. I

' Calling attention tothe gripping member 6, said members 5 and 6 being identically the same in construction, numerals 11 indicate a pair of opposed, rectangular plates,

and between their lower ends is disposed, to project outwardly thereof, a pair of opposed arms 12, preferably secured thereto by bolts 13.

At 14 and 1,4 are indicated a pair of op- 17 carried by the plates. 11, and it will be understood that stresses directed downwardly of the scaffold will automatically cause the toothed or milled sectors to engage orgrip the cable as means, additional to the first named sectors, for supporting said scafi'old. p a

I employ a plurality of verticallinks, these being arranged in pairs, as the pairs 18 and 19,- the' pair of links 18 a pivotal connection by means of bolts 20 with and between the ends of-the lever-sectors l4, and the pair of links: 19'having a similar connection 21 with the lever-sectors l4. tioned are pivotally connected with a pair ofcross-bars 22.

The hand-lever 9 is pivotally mounted at its inner end upon the plates 11 as indicatedjat 23, and is fulcrumed at 24 upon a coupling bar 25, the latter having a pivotal connection, as indicated at 26 upon the outer end of the lever-sector 16'. At 9? is indicated a lever having its inner end pivotally connected with the plates 11, as

The lower ends of the links menindicated at 23, its outer end having a pivotal connection 24' with a coupling bar 25-, the latter beingpivotally connected, as indicated'at 26" with the outer end of a leversector 16. Numerals 27 indicate bolts for securing the platesil together and in s aced relation. In this connection it should be stated that levers 9, 9 and the operating lever 32, in form, are substantially as shown in, Fig. 4, the arms w-being suitably spaced apart for engaginglthe parts with whichv they are connected.

Since the parts thus for described for the gripping-member 6 are identical in const'ruction and arrangement with "the parts of the gripping-member'5, it is not considered necessary to particularly describe the construction of the gripping-member 5. While I have shown bolts for the pivotal connections, I do not wish to be understood as limiting myself in this respect, but bolts are preferred since the parts of each gripping-member may be conveniently assembled, and if required,

they may be readily disconnected.

In order that the gripping-members 5 and 6 may be connected and may be operated in a manner to elevate or to lower the scaffold the lower member, 5 is provided with the pair of side-bars 28, their lower ends being secured to'the scafiold by, any suitable means,

, the means herein shown being the bolt 29' traversing the spacing member or sleeve 30, said side-bars projecting somewhat above the plates 11to provide a pivotal mounting'3l for the operating-lever 32,'the cross-bars 22 of member 6 being provided with the pair of links or actuating-arms 33 having. pivotal connections 34: with said cross-bars.

Numerals 35 indicate the pivotal mountings for the lever- sectors 16 and 16 upon the respective pairs of links 18 and 19. Numerals 36-indicate the pivotal mountings of the last named'links upon the cross-bar 22.

Numerals 37 indicate the pivotal mounting of the operating lever 32 upon thelinks '33.

At 38 (Figs. 1, 3,) is indicated the pivotal connection for the inner ends of the handlever 9'and 9 Straps 39 are employed as additional holding means for links 28, said straps being, disposed on the outer sides-pf said'links, near their upper ends and conwith the cable since the opposed springs 8 cause the milled parts of the sectors to make I this engagement; and it is obvious that any increase-in the weight of the scaflold will cause an increased degree of pressure of the sectors against the cable to prevent any.

movement of the members 5 and 6 longitudinally thereof.

In operatiomthe scaffold may be readily and conveniently elevated by .use-of the ap-.

paratus. To accomplish this, the sectors of the lower gripping-member 5 are first disposed as shown in Fig. 2 for the'upper gripping-member 6, so that the sectors of said member 5 will engage the cable 7, the weight of the scaffold thereby being sustained by the member 5. The operator then swings the lever 9 of'member 6 upwardly a limited distance, against the resistance of springs 8,

so that the sectors of said member 6will be.

released from the cable, and also causes an upward swinging movement of the operating lever 32 to elevate member 6, which, upon releasing the hand lever 9 of said upper member 6, will permit the sectors of said upper member 6 to immediately engage the cable. The operator then causes an upward swinging movement of the hand lever 9 of member 5 for releasing the sectors of said member from the cable, and by imparting a downward swinging movement'to the hand lever 32, said member 5 will, together with the scaffold, be elevated; and the operation 'may be repeated for elevating the scaffold any required distance longitudinally of the cable.

To lower the scafiold the operation is the reverse to that just described; that is to say,

the upper member 6, by use of its lever 9.

and the lever 32, is lowered, after which the scaffold is lowered by use of the lever 9 of the lower member 5, the lever 32 being permitted to swing gradually upward, the scaffold thereupon moving downwardly free from shocks or undue vibration, this last operation being repeated until the scaffold has been lowered a required distance longitudinally of the cable. h

By the construction as described, if it is desired to increase the distance to which the scafiold may be shifted at each operation, it is obvious that this maybe accomplished by increasing the distance between the pivotal mountings 31 and 37, and in constructing the apparatuses, this distance may be conveniently adjusted -by use of apertures 40 formed in the-lever 32 for the insertion of the pivot 37, depending upon the size or weight of the-scaffold and amount of material to be supported or hoisted.

- While I have shown and described two [opposed plates 11, and prefer the use of two, the apparatus would be operative if a single plate was employed and therefore I do not wish'to limit myself in this respect,

and it is understood that size, form and proportion, and minor details of construction may be changed, if desired, since I have illustrated onlyone embodiment of the indetermined by the appended claims.

'Iclaim:

1. In a scaffold hoisting apparatus, the

combination with an upright elongated support, of an upper gripping member, and a 7 lower gripping member, each grlpping mem- 'vention, the scope of said-invention being her consisting of a pair of connected plates upon-opposed sides of the support, a pair of opposed arms projecting outwardly of and connected with said plates, a pair of opposed, toothed lever-sectors between and from said support, and means for moving one of said gripping members longitudinally of the support after its lever-sectors have been released.

2. In a scaffold hoisting apparatus, the combination with an upright, elongated support, of an upper gripping-member, and a lower gripping-member, ea ch gripping-memher being provided with a plate, a pair'of opposed toothed lever-sectors eccentrically mounted on said plate, resilient means for causing normal engagement of the leversectors with the support to prevent a movement of the gripping-members longitudinally thereof, a second pair of opposed, toothed lever-sectors eccentrically mounted on said plate, links pivotally connected with said lever-sectors, means for moving the links against the action of said resilient means for releasing the lever-sectors from said support, and means for moving one of said gripping-members longitudinally of the support after its lever-sectors have been released.

3. Ina scaflold hoisting apparatus, the combination with anupright, elongated support, of an upper gripping-member, and a lower gripping-member, each gripping-member being provided with a plate, a pair of opposed arms projecting outwardly of and rigidly connected with said plate, a pair of opposed, toothed lever-sectors eccentrically mounted on said plate, springs connecting the arms and said lever-sectors for causing normal engagement of said lever-sectors with the support to prevent a movement of the gripping-members longitudinally of said support, a second pair of opposed, toothed lever-sectors eccentrically mounted onsaid plate, links pivotally connected with said lever-sectors, means for moving the links against the action of the springs for releasing thelever-sectors from said support, and means for moving one of said grippingmembers' longitudinally of the support after its lever-sectors have been released.

4. In' a scaffold hoisting apparatus, the combination with an upright, elongated support, of an upper gripping-member, and a' lower gripping-member, each gripping-memberconsisting ofa pair of connected plates upon opposed sides of the support, a pair of opposed lever-sectors between and ectuating &

resilient means for releasing the leversectors from said support, and means for a moving one of said gripping-members longitudinally of the support after its leversectors have been released.

5. In'a1 scafiold hoisting apparatus, the combination with a suspended cable, of a gripping-member, and a second grippingmember, each consisting of a pair of connected plates upon opposed sides of ,the cable, a pair of opposed arms projecting outwardly of and connected with said plates, a pair of opposed lever-sectors betweenand eccentrically mounted on said plates, springs connecting the arms and said lever-sectors for causing normal engagement of the lever sectors with the cable to prevent a move: ment of the gripping-members longitudinally of said cable, a second pair of opposed lever-sectors between and eccentrically mounted on said plates, links arranged in pairs, each pair of links being provided with a cross-bar and having pivotal connections with said lever sectors, means for mov'ingthe links against the action of the springs for releasing the lever-sectors from said cable, a pair of actuating-arms pivotally gripping-member and the actuating-arms ofthe links of the second gripping-member for moving one of said gripping-members longitudinally of the cable after its lever-sectors have been released.

'6. a scaffold hoisting apparatus, the combination with a suspended cable of a gripping-member, and a second gripping- .member, each including a plate, a pair of opposed lever-sectors eccentrically mounted on the plate, resllient means for causing normal, engagement of the lever-sectors with connected with the cross-bars of the-second v gripplng-memb'er, and an operating-lever the 'cable to prevent a movement of the gripping-members longitudinally thereof, a second palr of opposed lever-sectors eccentrlcally mounted on said plate, links connected/at one of their ends and having pivotal connections with said lever-sectors, means for movlng the links against'lthe action of the resilient means for releasing the lever-sectors from the cable, a pair of acwith t e connectedlinks of the second gripplng-rnember, and an operating-lever havlng pivotal connections with the first griparms having pivotal connections ping-member for moving one of said grippmg-members longitudinally of the cable after the lever-sectors thereof have-been released.

h 7. In a scaffold hoisting apparatus, the

confloination with a supporting cable, of a gripping-member, and a Secondgnppihgmember, each gripping-member including a pair 'of connected plates, a air of opposed ever-sectors between an eccentrlcally mounted on the plates, resilient means for causing normal engagement of the leversectors with. the cable to prevent movements of the gripping-members" longitudinallythereof, a secon pair of opposed leversectors between and eccentrically mounted on said plates, links arranged in pairs and pivotally connected with said lever-sectors,

a plurality of cross-bars, each having a pivotal connection with 'the links of a pair,

mea s for moving the links against the ac tion of said resilient means for releasing the lever-sectors from the cable, apair' of actuating-arms having pivotal connections with the first 'grippingrmember and'with ,said actuating-arms for moving one of said gripping-members longitudinally of the cable after the lever-sectors thereof have been released, and means to adjust the pivotal connection of said actuating-arms longitudinally of the operating-lever.-

8. In means for'hoisting' scaffolds upon cables, a gripping-member connected with the scaffold, a second gripping-member,

each of said gripping-members consisting of a pair of opposed, connected plates, leversect'ors arranged in pairs between. and eccentrically mounted upon'j the plates, resilient means for causing normal engagement of the lever-sectors with the cable, members arranged .to have upward swinging movements for disengaging the lever-sectors from the cable, and an operating-lever disposed between and connected with said grippmgmembers, said lever being movable for increasing or. decreasing the distance between .the gripping-members.

gripping-members and being movable for increaslng or decreasing the distance between said gripping-members. I

10. In means for'hoisting-scafi'olds upon cables, a gripping-member connected. with the scafiold, a second gripping-member, each of said gripping-members consisting of a pair of connected plates upon opposed sides of thecable, lever-sectors arranged in' pairs between and eccentrically mounted on the plates, links pivotally mounted on the sectorlevers, springs for normally causing engagement of the sector-levers with the'cable, means for causing co-incident movements :of the links'for disengaging-the lever sec tors from the cable, and means for increasing or .decreasingthe distance between the. first named gripping-member and second gripping-member while the lever-sectors of one gripping-member are in engagement I with the cable.

In testimony whereof, I have affixed my presence of two witnesses. JASPER E. GOODWILL. Witnesses:

HmAMA. STU'RGES, G; S- GFQDWILL- signature in

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