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Publication numberUS2216912 A
Publication typeGrant
Publication dateOct 8, 1940
Filing dateMar 5, 1940
Priority dateMar 5, 1940
Publication numberUS 2216912 A, US 2216912A, US-A-2216912, US2216912 A, US2216912A
InventorsPeter Hoitsma
Original AssigneePeter Hoitsma
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Scaffold machine
US 2216912 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

F'.v HolTsMA 2,216,912

scAFFoLD MACHINE Filed March 5, 1940 Pbicr Ho ismn',


Patented Oct. 8, 1940 PATENT OFFICE i SCAFFOLD MACHINE Peter Hoitsma, Paterson, N. J.

Applicationv March A5,

parts thereof, though so disposed as to be readily accessible `and operable with complete safety and convenience, may be'put `in such state as to be completely out of the way of the workmen as they move about over the platform supported by the` apparatus; also such a construction of the iixed structure of the apparatus `as to facilitate assembling the apparatus with the upright and provide for the support of either a guard-rail or planking to serve as a work-bench and act as a guard rail.

In the drawing," v

Fig. l isa side elevation of the improved apparatus and a supporting upright; it Fig. ,2 is Aa` similar" elevation of a fragment oi what is shown by Fig. 1, with the operating lever in folded state; 1

Fig. 3 is a fragmentary inside elevation of the upper part oi the apparatus;

Fig. 4 is a plan, with the upright in section;

Fig. 5 is a fragmentary side elevation of the lower gripper; y Figs. 6 and 7 are sections on lines 64-6 and 'l"l, respectively, Fig. l; and

Figs. 3 to l0 show certain details. l

Let I be a 4 `X 4 wooden upright on which the apparatus of this invention is, arranged, being adapted to stand on the ground. The load-sup porting structure includes the following parts: A pair of vertical parallel at metal strips 2 spaced to receive the upright between them, they being adapted to project somewhat inwardly or toward the building; and a platform-support comprising bars 3 removably bolted at 3a to and i5 projecting inwardly from the strips, and braces lifor the bars removably bolted at 4a to them and also to the strips. 5 designates planking to form the platform. The platform-support may have a folding extension 6 pivoted thereto and in 5o its horizontal position adapted to abut a suitable stop 1. l

The upper and lower shackles 8 are ,substantially identical U-shaped members which straddle the upright, their extremities projecting out- Wardly. For effecting a grip on the upright the i 1940, Serial N0.-322,273

lower shackle has a pair oi cross-sectionally square non-rotative bars 9 respectively arrangedto present edges thereoto the inner and outer faces oil-the upright. For effecting such grip@` and also provide for travel of the apparatus up or 'down the upright the upper shackle has a barilil, like the bars 9, arranged to bear-against the inner side of the upright anda revoluble square twisted bar Il arranged to bear againstV the outer face ofthe upright, such having a 10 crank lla for rotating it. Each shackle is pivoted atits inner end on `a pin l2 in the upper end of a U-shapedlink I3, there `being a spring Hl coiled about the pivot and engaged with the W shackle and-link and tending to hold them sub 15 "4"' stantially alined, or with the link bearing against `a cut-out portion im. of the shackle;` thus the normal positions oi the shackles. when assembled with the upright is that shown, their bars pressing against the opposite faces ofthe upright.`

The low-er link has its extremitiespivoted to the two strips 2. The upper link is supported thus: A` lever i5; to project inwardly is fulcrumed in the strips 2 at IEia and between s uch fulcrum andthe free" end of the lever the `link` is pivoted theretoat 55h, the arrangement being such that the lever may be folded up to the position shown in Fig. 2, with incidental rise of the shackle.

At the upper end of each strip 2 is a plate I6 3()` in face-to-face relation thereto and projecting outwardly therefrom. It is pivoted thereto at l1 but kept in horizontal position by a removable bolt l, common to both plates. The projecting ends of the plates are spanned by a removable pin I9 adjacent the outer face of the upright. V

A U-shaped support 20 is also arranged at the upper ends: of the strips, the same comprising a pair of angle-iron bars Ella, appreciably longer 40' than the plates, and a plate 20h face to face with and riveted to their inner ends; this support is to straddle the upright. For supporting it there is a pivoting bolt 2l penetrating it and thestrips and plates and arranged at the inner side of thevupright and a removable pin 22 penetrating the A"support and plates and yarranged at the outer face of said upright. Itis provided with duplicate holes 23 to receive the bolt and pin. In the position shown its projecting inner ends may support a guard-rail 25, as a 2 X 4, for the Workmen; its outer end may carry another rail 25 which and the rail 24 may be bridged by a 2` X 4? strip 26 for supporting planking (not shown) to form a work-bench,

Clamped between the strips 2 by the bolts 4a-3ai8 are spacing sleeves or spacers such as 21 (Fig. 3) penetrated by the bolts.

According to the present construction (not true of my patented ones) the lever projects inward so that it may be operated with perfect safety and be readily accessible. Moreover, when not in use it may be folded into quite compact state with respect to the remainder of the apparatus and thus be completely out of the way of the workmen due to the folding: Instead of straddlng the rigid structure, such as its strips 2, it is straddled by them and since the strips project inwardly thus as to their inwardly projecting portions affording a fulcrum for the lever the latter may be fully folded, as shown, without the folding movement being opposed by the upright even though the lever is of bifurcated form as shown in Fig. 7.

The laws of many States require some safety barrier for the workmen which shall span the two such uprights as one at a proper level above the platform, as 5. With this end in view I have provided at the upper ends of the strips the plates I6; incidentally, due to the bolts and the spacers at 27 at the upper ends of the strips as well as at their lower ends, the strips and plates normally form parts of a rigid structure. On the part of this structure aorded by the plates the unitary support 20 is mounted, normally in rigid state and both it and the plates providing said structure with an open crotch to receiveV the upright. Said support may then receive the indicated means to form the barrier; :that is to say, the rail 24 or, when such barrier is to be a work-bench, another rail 25 and the bridging strip 26 on which planking for the bench may be laid. If required such bench may be set inward on removing the elements 2 I--22, then to .be tted to the holes 23.

the support 20 is removed and the other parts are folded thus: As for the plates I6, by remov`- ing the devices l8-|9; as for the grippers, by removing their outer bars 9-I I so that they may assume the alined state with their links; as for the lever, by shifting it to the position shown in Fig. 2; and as for the platform support by removing bolt 3a and folding bars 3 and 4 together and then into compact relation to the strips 2.

Having thus fully described my invention what I claim is:

l. A scaffold apparatus including an upright having an inner face, a load-carrying structure movable up and down on the upright and including a pair of spaced upright strips having the upright between them and upright edges thereof projecting in the same direction as said face and also including means maintaining said strips in rigid relation to each other, a gripping device operatively connected with the strips and normally gripping the upright, a bifurcated lever fulcrumed in and projecting from between the strips and away from said face and movable into folded relation to and between the strips, a gripper embracing the upright and extending between the strips and having gripping portions to engage said face and the opposite face of the upright, and a link connecting the lever relatively inward of its fulcrum with the gripper at a point inward of the inner face of the upright.

2. In a scaiold apparatus of the class set forth, a load-carrying structure to be supported by an upright including a pair of spaced vertically extending flat members presenting their broad faces to each other and adapted to receive between them the upright, means to secure said members in rigid relation to each other, a horizontally extending U-shaped barrier-support straddling and pivoted to said members on a horizontal axis, and a removable pin penetrating said members and barrier-support eccentrically of said pivot and normally supporting the latter in horizontally extending position, said barriersupport being free on removal of the pin to be turned to Vertical position.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2424115 *Dec 14, 1945Jul 15, 1947Douglas Powell ArchibaldElevating support for scaffold platforms
US2790684 *Feb 23, 1954Apr 30, 1957Sprinkel George HScaffold bracket
US2846275 *Aug 23, 1955Aug 5, 1958Segur AbAdjustable scaffolding
US2988165 *Feb 7, 1957Jun 13, 1961Thomas D Copeland JrScaffolding arrangement
US3420334 *Sep 1, 1967Jan 7, 1969Talbot Albert KCantilever clamp for scaffold ledger
US3710734 *Aug 21, 1970Jan 16, 1973Zero Cold IncShelving system
US3970277 *Oct 15, 1974Jul 20, 1976Riblet Henry JScaffold bracket
US4103856 *Jul 19, 1976Aug 1, 1978Henry RibletAdjustable scaffold bracket
US4298095 *Jan 17, 1980Nov 3, 1981Black & Decker Inc.Work support frame
US4308934 *Feb 8, 1979Jan 5, 1982Black & Decker Inc.Work support
US5259478 *May 5, 1993Nov 9, 1993Quality Steel Products, Inc.Pump jack with release mechanism
US7152835 *Sep 17, 2001Dec 26, 2006Riblet Henry JBracket assembly lock
US7475856Apr 5, 2006Jan 13, 2009Riblet Henry JShackle for load supporting bracket assembly
US7780130 *Nov 24, 2008Aug 24, 2010Riblet Henry JShackle for load supporting bracket assembly
US20040099478 *Nov 27, 2002May 27, 2004Xerox CorporationClimbing apparatus and method
U.S. Classification182/136, 182/229, 182/131
International ClassificationE04G1/20, E04G1/18
Cooperative ClassificationE04G1/20
European ClassificationE04G1/20