US1234510A - Foldable scaffold-jack. - Google Patents

Description

H. G. TR'AUTWEIN.

FOLDABLE SCAFFOLD JACK.

APPLICATION FILED AUG. 19. 1916.

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Patented July 24, 1917.

l 2 SHEETS-SHEETI @mi ATTORNEYS u zz H. G. TRAUTWEIN. FOLDABLE SCAFFOLD JACK.

APPLICATION FILED AUG-19.1916.

Patented July 24, 1917,

2 SHEETS-SHEET 2 1,. lll V [lll l!! HENRY e. rnaurwnnv, Vor NEW i. .L

"FQLDABLE scnFFoLD-Jacx. f

Specification `of /Letters Patent.

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` Application led August I, 1916. Serial N o. 115,780.

To 'all 'whom t muy concern: Be it lmown that I, HENRY G. TRADTWEIN, a citizen of the United States, residing at Newark, in the county of Essex and yState of New J ersey,` have invented certain new and useful Improvements in Foldable Scali'old-g Jacks; and I do hereby declare the following lto be a full, clear, and exact description of the invention, 'such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accom anying drawings, and to char# acters of re erence marked thereon, which form a part of this specification.

The present invention relates, generally, to improvements in scaffold jacks; and the invention has reference, more particularly,

to an improved construction of collapsible adjustablel scaffold jack,

The present invention has for its principal object to provide a very simple, yet strong and durable, adjustable or extensible scaffold jack adapted to provide a firm and stable support for workmens scaffold platforms, said scaffold jack being so constructed that it may readilybe collapsed .or folded into a comparatively compact bulk, so as to render the same easily carriedabout from place to place or stored when not in use.

AOther objects of the present invention, not at this time more particularly enumerated, will be clearly understood from the following detailedy description ofthe same. v

With the various objects of the present invention in view, thefsame consists, primarily, in the novel construction of foldable adjustable scaold jack hereinafter set forth; and, the invention consists, furthermore, in the several novel arrangements and combinations of the various devices and parts, as well as in the details of the construction of the same, all of which will be more fully described in detail in the following specilication, and then iinally embodied in the claims which are appended to and which form an essential part of said specification. The invention is clearly illustrated in the accompanying drawings, inwhich Figurev 1 is a side elevation of the novel construction of scaffold jack made according to and embodying the principles of v.my present invention, the same being shown in its normal operated or erected position, ad-

justed to support a 'scaiiold platform at a desired height.

Fig. 2 is a horizontal sect1on of the same,

.reference c taken'on line 2 2 in said Fig. 1, looking downward.

Fig. 3 is a vertical longitudinal section of thcsar'ne.

"Fig, lis a side elevation of the same, as it appears when collapsed and folded up Ainto compact readily portable form.

Fig. 5 is a detail longitudinal section of Yone ofrthe laterally extending leg braces `or struts used in connection A with 'said novel scaffold jack, the same being drawn on an enlarged scale.

Fig. 6 is a detail vertical longitudinal section through the locking-latch of the extensible main standard or post of said scaffold jack, the same being drawn on an enlarged scale.

Fig. 7 isa detail horizontal section taken on line 7 7 in said Fig. 1.

Similar characters of reference are employed in all of the hereinabove described views to indicate corresponding parts.

Re erring now to the said drawings the aracter 1 indicates vthe 'complete novel scaffold jack made according to and embodyin the principles of my present invention, t e same comprising a tubular main body or standard 2 within which is telescopi-y cally disposed a tubular extensible standard 3, adapted to be extended or projected from the upper end of said main body or standard 2. Secured upon the upper free end of -said extensible standard 3 is a fixed collar -Supported upon the upper free end of i said extensible standard 3, in swiveled relation thereto, is a head-frame 5 having a downwardly extending hub-portion 6 which is` inserted within the upper open end of said extensible standard 3, so as to be capable of swiveling or turning therein. Said hubportion 6 is provided with an annular groove 7 into which project the. free ends of retaining pins 8, which are secured in place 4by passing the same laterally through said collar 4; and the walls of said extensible standard so that they project interiorly within the opening of the latter and thus into said annular groove 7, thus retaining said head-frame 5 from removal while permitting the same to freely turn or swivelk in such secured position. Said head-frame 5 is further provided with a .pair of upside thereof, 1s a wardly extending embracing arms 9, between which is inserted the beam or rail 10 uponwhich scaffold planking may be supported. Extending transversely through the upper end of one of said embracingin screwing relation thereto, 1s a).

'der portion with a bearing-socket 14, the

side walls of which are pierced to provide openings for transversely extendmg hinge or ivot pins y15 to pass therethrough. ful

ecured upon the exterior of said Crum-block 12,1i11 a suitable location is a- -latch member 16 which depends there rom, and extends downwardly over the exterior of said main-body or standard 2, the free end-thereof terminating in an outwardly bent or curved Enger-piece 17. Secured tothe said spring-latch member 16, inwardly from the under latch-pin or stud 18, which extends through an opening or hole 19 suitsprin sa as to project ably formed and' located in the wall 'of `said longitudinally mam-body orstandard 2, and thus is caused to project laterally into the interior of s aid main-body or standard 2. Said extensible standard 3 vis provided with a plurality of disposedholes or openings 20, spacedv one from the other at desired intervals, any` ene of which maybe registered with said opening or hole 19 of said main body or standard 2, when said springlatch. member-16 is manipulated. to withdraw said `latch-pinl or stud 18, so that when said `spring-latch member is released said -latch-pin or stud 18 will enter the registered hole oropening 20 and thus lock said extensible standard' 3'in a desired extended position to elevate said head-frame 5 to the desired height. v The'reference character 21 indicates the main leg-members of the scaold jack 1, the

same beingof tubular form. Telescopically disposed within the said main leg-members 21 are .tubular extensible/leg-portions 22, adapted .to be extended or projected from the lower ends of saidmain leg-members 21. Secured within the upper end of each main leg-member 21 isthe butt 23 of a perforated" journal-lug or ear 24, which projects upwardly from said upper ends of said main leg-members. Saidjournal-lugs or ears 24; are inserted within a bearing-socket 14 of a Afulcrum-lug 13 so that said hinge or pivotpin 15 thereof ypasses through the perforar-'- y tion of said journal-lugs or ears 24:, and thus pivotally connects each main with said main bodyl or standard 2. Each extensible leg-portion 22 is provided with a. suitably positioned interiorly disposed anchor-block 25 aiiixed thereto. Secured o1' anchored in said anchor-block 25 isa stud or the wall of said yextensible leg-portion 22, and thence through a longitudinally extending guide-slot 27 provided in the wall of said main leg-member 21, and thence through an opening 28 of a slip-collar 29 which is slidably disposed upon the exterior 'of said main leg-members 21.. The free end leg-member 21 shank 26 which projects outwardly througl effA 30 of said stud or shank `projects from said slip-collar 29 and is screw-threaded to receive va winged lock-nut 31. 'Now if it is desired to extend outwardly said extensible leg-portion 22 to lengthen the leg and thereby increase the elevation of the jack, said end 30 of said stud or shank 26, and pushed downwardly upon said main leg-member 21. This downward movement of said slip-collar is transmitted to said ,stud or shank 26 and through the same to said extensible Nlegwinged lock-nut 31 is loosened on the free portion 22so that the same is thereby moved outwardly or extended from the lower end sible leg-portion islocked in immovable relation to said main leg-member by tightening upthe winged lock-nut 31 which tends to inch the vintervening wall portions of sal leg-portion j together and between said anchor-block 25 and said slip-collar 29, thus securely lbinding said parts together in strong frictional relation against movement' relatively one to the other, as will be more particularly understood from an inspection of Figs.'3 land 7 of the accompanying drawings. Secured within the lower end of each extensible leg-portion 22 is the butt 32 of an outwardly projecting foot-piece 33, which magI be of any suitable design or form.

ecured xedly upon each main leg-membei-"21, preferably adjacent to the lower end thereof, is a yoke-piece 34 having a pair of oppo'sitely extending pivot-j ournals 35, upon whichare pivoted the ends of a pair ofstays 36, one of which extends Jfrom each side of said legmember 21. Slidably disposed upon the exterior surface ofsaid main body or standard 2 is a movable yoke-piece 37 having .outwardly extending perforated main leg-member and said extensible ears 38 adapted to carry pivot-journals 38 to wliichthe opposite ends of said stays 36 are pivotally secured. Whenthe leg-members 21` areswung outwardly upon their plvotal connections with said main-body or f standard 2, said movable yoke-piece 37 slides downward upon said main-body or standard 1 3()A 95 of said main leg-member- 21-for any desired distance.' Being thus extended, the exten- 2 until brought to rest against a pair of stopstuds 39 which are secured to said maili- .body or standard. 2 so as to project outwardly therefrom adjacent tothe lower end thereof. In this manner the said sta s 36.

slightly toward the main-body or standard 2 thus firmly maintaining said movable yoke-piece 37 in 4engagement with said stopstuds 39, and firmly held against any tendency to move upward with a consequent tendency of the leg-members to move inwardly to their folded yor collapsed positions.

Of course it will be understood'that my novel construction of scaffold jack may be made in various sizes in accordance with the demands made thereon relative to their supporting strength and rigidity. When said novel scaffold jacks are made 'in-the larger or heavier sizes, it is desirable to reinforce or brace the leg-members thereof against any lateral movement which might result in a displacement thereof from proper supporting position, and a consequent collapse of the jack. To this end I provide in association with the leg-members of said jack a novel construction of laterally extending foldable brace-members adapted to extend from one leg-member to another. These brace-members each comprise a pair of brace or strut members 40, the outer ends of which are provided with hinge-links 41, adapted to be pivotally connected with said leg-members by means of hinge-staples 42 which are preferably aiiixed to said stays 36 at a point thereon adjacent to the pivotal connection thereof with said leg-members 21. inner ends of said brace or strut members 40 are connected together with suitable break joint devices, preferably in the form of a ball member 43 connected with one brace or strut member, and a socket-member 44, adapted to embrace said ball-member, connected with the other brace or strut member, although it will be apparent that other forms of break joint devices may be em ployed if desired. -When said leg-members 21 are spread in operative position said respective brace or strut members 40 are alined together so as to extend laterally between said leg-members, and when in such'position it is preferable to lock the break joint devices thereof against ,yielding or pivotal action. To this end a locking means is provided in the form of a slidable bolt 45 which slides in a tubular guide-way 46 which extends marcio The through the ball and socket members 43 and 44.

aid bolt 45 is provided with a transv versely projecting finger-piece 47 which extends through a slot 48 formed in one of said brace or Astrut members 40, so that said bolt may be manipulated thereby. When it is desired to lock said break joint the said slidable bolt 45 is thrust through `the balll and socket members 43 and 44, as shown in Fig. 5 of the drawings, thus preventing any ,pivotal action of said break joint, and thereby holding said brace or strut members 40 in rigid alinement and operatively extending between said leg-members 21, so that any tendency of the latter to shift laterally, or to become displaced from proper supporting 'position will be Checked and prevented.

It will be clearly understood` from the' above description that my herewith presented construction of scaffoldV jack is very 'simple in character, yet is capable of quick and easy manipulation to set up the same, and is further capable -of being variously adjusted in its extended set up position to accommodate the same very readily to the demands made thereon as to height of the scaffold supported thereby, and asV to position or direction of extension of the beams or rails 10, since the latter may be extended in any direction by reason of the swiveled connection of the 'head-frames 5 With which they are connected. it will also'be understood that in using the scaffold jack, two

or more of the same will be employed, in

accordance with the'kind 'and position-,of scaffolding desired.'

By an inspection of Fig. 4 'of lthe accompanying drawings, it will be clearly understood, that my novel sca'old jack may be lfoldedup or collapsed so as to render its V bulklverycompact, when it is desired t move the sameor store the same away when not in use. To fold up the novel scadold jack, the extensible standard 3 is unlocked and thrust downwardly and telescopically into said main-body or standard 2, and then locked in such position'by the spring-latch.

supon said main-body or standard 2, which draws' in the stays 36 'and folds lthe legmembers 21 in close parallel relation to said main-body or standard 2, said lateral brace or strut members simultaneously folding up as shown. rlhen the extensible leg-portions 22 are released from locking relation to said leg-members 21, and thrust upwardly and telescopically into the latter, in which updrawn position they may be locked b said locln'ng devices. The lower ends of sald legmembers 2l, or if desired the extensible the lvarious i' self to the exact details of the construction l of said parts as shown in the accompanying leg-plortions 22, are provided catc 'devices 49, the nosing 50 of whisnwll engage over the marginal edge ofthe lower end of -said extensible standard 3, or if desired the lower end of said nain-body or `standard 2, to retain said leg-members 21` their folded up `positions. It will thus be seen that the. scafold-jack will -be .re-

duced lto avery compact. and easily portable bulk.

My novel construction of scaffold jack is also very strong and durable,'and capable of carryin a heavy load, yetv at the' same time may e `made tobe of relatively light weight to render the same easily portable` all fortheY reason that it is principally constrcted of metallic tubin which provides not only requisite strengt and durability,

` but also the other necessary requirement, to

wit, lightness ofweight. a

I am aware that some binations of the various devices and parts of my Apresent invention, as well-asL in the details of the construction of the same, without departing from the scope thereof as set forth inthe foregoing specification,-

and as dened in the claims appended hereto. .Hence, I do not limit my invention to the exact arrangements and combinations of going speci cation, nor do I conine mydrawings..

I claim A v1. in a device of the and described a ,central standard leg-members pivoted to said standard, a sldable yoke on said standard, stays pivoted between said.legmem.

bers and said yoke, and a foldable brace- A changes Amay be' made in .the'several arrangements and com-` arts as described in the fore-` ymember connected v between adjacent iegmembers.

2. In a device of the kind described 'a central standard, leg-members pivoted to said standard, foldable stays between saidv leg-members and said standard, foldable brace-members connected-between adjacent leg-members, and means for locking said" brace-members in rigid lateral extension from one leg-member to another.

3. In a devicev of the kind described a central standard, leg-members pivoted to said standard, foldable stays between said leg-members and saidl standard, foldable brace-members connected between adjacent lleg-members, comprising a pair of'strutmembers, the outer ends of which are respectively pivoted to adjacent leg-members,

"and a'yieldable joint connecting together the innerends of said strut-members.

4.7 In aI device of the kind described a central standard, leg-members pivoted to 4said standard, foldable stays between said leg-members and tsaid standard, foldable brace-members connected between adjacent Y.

leg-members, comprising a pair of strutlmembers,`,the outer endsof vwhich are respectively pivoted to adjacent le -members,

a yieldable joint connecting toget er the in-

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