Title:
Portable hydraulic hoist or movable scaffold
United States Patent 2183679


Abstract:
My invention relates to a movable scaffold and includes a platform adjustable in position vertically and horizontally by an operator on said platform, and by apparatus located at a lower level. The vertical adjustment is by hydraulic power. In the accompanying drawings: Fig. 1 is a plan view...



Inventors:
Hillis, David R.
Application Number:
US21888838A
Publication Date:
12/19/1939
Filing Date:
07/12/1938
Assignee:
RECONSTRUCTION FINANCE CORP
Primary Class:
Other Classes:
60/477, 182/16, 182/141, 280/62, 280/81.5
International Classes:
E04G1/22
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Description:

My invention relates to a movable scaffold and includes a platform adjustable in position vertically and horizontally by an operator on said platform, and by apparatus located at a lower level. The vertical adjustment is by hydraulic power.

In the accompanying drawings: Fig. 1 is a plan view of an apparatus embodying my invention; Fig. 2 is a side elevation looking from below Fig. 1, the platform being in its lower position; Fig. 3 is an elevation looking from the left of Figs. 1 and 2, the platform being raised; Fig. 4 is a sectional elevation to an enlarged scale, broken away intermediate its .upper and lower ends and at the right hand side to economize room; Fig. 5 is a sectional elevation of the part of the construction broken away at the right in Fig. 4; Fig. 6 is a detail section on the line 6-6 Fig. 5; Fig. 7 is a detail section on the line 7-1 Fig. 5; Fig. 8 (sheet 1) is a detail section on the line 8-8 Fig. 2; Fig. 9 is a section on the line 9-- Fig. 2; Fig. 10 is a sectional elevation to an enlarged scale of the pumping apparatus; Fig. 11 (sheet 4) is a perspective view of a modified structure where duplicate positioning apparatus are used, shown in a portion of a room; 80 Fig. 12 is an elevation looking from the right of Fig. 11, to a reduced scale; and Fig. 13 is a detail section on the line 13-13 Fig. 11, to an enlarged scale.

I is a supporting platform, or supporting base, of sufficient breadth at its end la, its sides converging toward an intermediate point 2 and extending in a girder-like arm 3 to the other end, Ib. 4-4 are supporting wheels at opposite sides of the platform. At the end la thereof (Fig. 3) is a tube 5 extending across the platform I beneath its end la. 5a-5a are stub axles for the wheels 4-4 which extend into the ends of the tube 5 and slide out and into said tube to adjust the wheels 4-4 to different distances apart, to pass through a doorway, or to prevent the tipping of the scaffold when in raised position.

They may be secured in adjusted position in any suitable manner. 6 is a wheel supporting the end Ib of the platform 1. The wheel 6 is adapted to turn about a vertical axis as hereinafter described.

7-7 are standards extending upward from the platform I at points adjacent to its corners at its end la. 8 is a tube extending vertically upS ward from the platform I at the point 2 to which its sides converge. The wheel 6 (Fig. 5) has its axis bearing in the lower ends of the branches of a fork 6a which fork has a hub, or arbor, 9 fixed in the outer end of the arm 3 so as to turn about a vertical axis. 10 is a tube, square in cross-section as shown in Fig. 7, having its lower end fixed to the upper end of the hub 9 and extending upward to a point a little below'that of the operating mechanism of the apparatus. II is a framework adapted to slide vertically on the uprights 7-7, and carrying the platform 12 upon which the workman stands.

13 indicates rods extending horizontally from a standard 7 and the corresponding part of .the frame 11, serving as rounds of a ladder by which a workman may mount to the platform 12.

14 is a transverse girder extending between the side pieces of the frame II, at the top thereof and 15 is a cantilever arm extending from the'center of the girder 14 to a point just above the tube 10.

The tube 8 extends upward from the point 2 of the platform I, to a point just below the center of the girder 14 where the arm 15 joins it, when the platform is in its lowest position. The tube 8, at that time, passes through an arcuate opening in the platform I and is provided with a drainage opening 8a at its lower end, as shown in Fig. 4. 17 is a tube fixed at its upper end to the girder 14, extending downward therefrom and 80 fitting and adapted to slide in the tube 8. The lower end of the tube I T is closed.

18Iis a pump in the upper end of the tube 17, having a plunger 19 extending above the girder 14. 18a is the suction, or intake, pipe of the 3 pump 18 open at the lower end in the tube 17. 20 is a casting closing the upper end of the tube 17 and forming the head of the pump 18. There "is a cavity 21 formed in the head 20. 22 is the discharge pipe of the pump 18 leading to and opening into the cavity 21 in the pump head 20.

The cavity 21 opens through a passage 23 to the interior of the cylinder of the pump 18 and through said cylinder and a passage 24 to the interior of the tube 17. 25 is a pipe leading from the cavity 21, mainly within the tube 17 and opening into the tube 8 through the bottom of the tube I7, (Fig. 4). 26-26are handles by which the plunger 19 may be reciprocated.

is a notch in the lower edge of the pump 60 handle 26, and 51 is a spring pressed pin adapted to engage said notch to prevent an accidental raising of said handle to release position.

The frame 11 is raised and lowered as follows: The tubes 8 and 17 and pump 18 being full of u oil, the plunger I is reciprocated by one or both of the handles 26, drawing the oil from the tube 17 through the pipe 18a, and forcing it through the pipe 22 into the cavity 21 and from this 6 through the pipe 25 into the tube 8 below the lower closed end of the tube 17 thus forcing the tube 17 upward which carries with it the frame 11 and platform 12.

When it is desired to lower the frame II, the pin 51 is pulled outwardly against its spring pressure, thus preventing the pin from engaging the notch 50, the plunger 19 is raised until its lower end-is above the passages 23-24 as shown in Fig. 10. Then the weight of the frame 1 I I will force the tube 17 downward, the oil pass-ing from the lower end of the tube 18 through the pipe 25, cavity 21 and passages 23-24 into the tube I7.

Referring more specifically to Figs. 5, 6 and 7 SO (sheet 2).

27 is a bevel wheel on the shaft of the wheel S. 28 is a bevel wheel on a vertical shaft bear'ing in a branch of the fork 6a and meshing with the bevel wheel 27. 29 is a pinion on the upper end of the shaft of the bevel wheel 28. 30 is a gear wheel meshing with the pinion 29 and having a shaft bearing in, and extending upward through, the hub 9 co-axial therewith, and extending above said hub in a squared portion 30a M0 to a point near the upper end of the tube 10. 31 is a tube square in cross-section, extending and fitting into the tube 10 from the upper end of the latter and having a hub 3 a, bearing and adapted to turn about a vertical axis, in the 3 outer end .of the arm 16.

32 is a shaft extending and bearing in and through the bearing 31a coaxial therewith and adapted to turn about a vertical axis.. The lower end of the shaft 32 is square in cross-section. 33 is a tube square in cross-section upon the squared Slower end of the shaft 32 and extending over and fitting and adapted to slide upon the square portion 30a of the shaft of the gear wheel 30. 34 is a handle by which the shaft 32 may be rotated and 36 is a handle by which the hub 4 31la and the tube 31 may be turned. 36 is a sliding block on the handle 35 by which said handle may be locked to the stationary lug 36a or to a lug 34a on the handle 34, or, when in an intermediate position, will leave the handle 35 free to Sbe moved independently of the handle 34. 37 is a click to fix the block 36 in its adjusted posi tion.

The above described apparatus is operated to move and direct the horizontal motion of the scaffold in the following manner. The block 36 is first moved outward to connect the handles 34 and 35. Said handles are then manipulated to rotate the tube 31 and consequently the tube 0 1 which latter carries the wheel 6 with it through the hub 9 until the wheel 6 is in the direction it is desired that it shall move. The sliding block 36 Is then moved inward until the handle 35 is anchored to the lug 36a.. The hanU die 34 is then turned which rotates the shaft 32, . tube 33 and therethrough the squared portion 31a of the shaft of the gear wheel 36. This drives the wheel 6 through the pinion 29 and bevel gear wheels 28 and 21 to carry the scaffold in the desired direction.

In the modification, Figs. 11 and 12, two constructions substantially like that above described, are used, the wheels 4 here being pivotally mounted and the tube 8 is'centrally mounted in T each construction. A platform 12 la extended between the two constructions. The upper ends of the simplified upper frame-work I I are united by extensible rods or tubes 38, which may support required receptacles 39 and the single standards Ix are joined by an extensible member 40, consisting of a tube 41 (Fig. 13) split at its end and a tube 42 extending into said split end. The parts of the split end of the tube 41 may be pressed together by a screw,43, bearing in a part extending from one split portion over the other, the end of said screw engaging against said split portion.

Aside from the specific embodiments of the invention herein shown and described, it will be understood that numerous details of the construction may be altered or omitted without departing from the spirit and scope of the invention as disclosed and claimed, and that I do not desire to limit the invention to the exact constructions herein set forth. I claim: 1. In an apparatus of the kind described, a movable base, a vertically adjustable platform supported on said base, a steering wheel forming part of the support of said base, having a vertical arbor rotatable in a bearing in said base, a hollow member forming an upward extension of said arbor, a member extending downward from said platform into the first mentioned member adapted to slide longitudinally in the S3 same but restrained from turning relative thereto, and means operable from said platform for turning said member extending downward therefrom, means for rotating said wheel to move said base, an extensible means passing axially 34 through said members adapted to actuate said rotating means, and means operable from said platform for actuating said extensible means.

2. In an apparatus of the kind described, a movable base, a vertically adjustable platform supported on said base, a steering wheel forming part of the support of said base, having a vertical arbor rotatable in a bearing in said base, a hollow member forming an upward extension of said arbor, a member extending downward from said platform into the first mentioned member adapted to slide longitudinally in the same but restrained from turning relative thereto, and means operable from said platform for turning said member extending downward therefrom, means for rotating said wheel to move said base, an extensible means passing axially through said members adapted to actuate said rotating means, and means operable from said platform for actuating said extensible means, and means for binding together at will the means for turning said member and the means for actuating said rotating means.

3. In an apparatus of the kind described, a vertically movable platform, a vertically extending tubular member below said platform, a tubular member extending downward from said platform, fitting and adapted to slide in the first named tubular member, the lower ends of both of said tubular members being closed, and a pump at the upper end of the second named tubular member and extending into the same, having its intake communicating with the interior of the second named tubular member and its discharge port communicating with the first named tubular member below the second named tubular member.

4. In an apparatus of the kind described, a vertically movable platform, a vertically extending tubular member below said platform, a tubu- 76 lar member extending downward from said platform, fitting and adapted to slide in the first named tubular member, the lower ends of both of said tubular members being closed, a pump at the upper end of the second named tubular member and extending into the same, having its intake communicating with the interior of the second named tubular member and its discharge port communicating with the first named tubular member below the second named tubular member, and means for putting the interior of said tubular members into connection at will.

5. In an apparatus of the kind described a vertically movable platform, a vertically extending tubular member below said platform, a tubular member extending downward from said platform, fitting and adapted to slide in the first named tubular member, the lower ends of both of said tubular members being closed, a pump having a plunger at the upper end of the second named tubular member and extending into the same, having its intake communicating with the interior of the second named tubular member and its discharge passage communicating with the first named tubular member below the second named tubular member, and a passage between the interior of said second tubular member and the first named tubular member, so located that it shall be closed by said plunger during the normal travel of the same and will be opened by said plunger passing beyond its normal travel.

6. In an apparatus of the kind described a vertically movable platform, a vertically extending tubular member below said platform, a tubular member extending downward from said platform, fitting and adapted to slide in the first named tubular member, the lower ends of both of said tubular members being closed, a pump having a plunger at the upper end of the second named tubular member and extending into the same, having its intake communicating with the interior of the second named tubular member and its discharge passage communicating with the first named tubular member below the second named tubular member, a passage between the interior of said second tubular member and the first named tubular member, so located that it shall be closed by said plunger during the normal travel of the same and will be opened by said plunger passing beyond its normal travel, and a displaceable means for limiting the normal travel of said plunger. . 7. In an apparatus of the kind described a vertically movable platform, a vertically extending tubular member below said platform, a tubular member extending downward from said platform fitting and adapted to slide in the first named tubular member, the lower ends of both of said tubular members being closed, a pump having a cylinder head and plunger reciprocating therethrough at the upper end of the second named tubular member and extending into the same, a passage in said cylinder head opening from the bore in which said plunger reciprocates upon both sides of said plunger, said pump having its intake communicating with the interior of the second named tubular member and its 80 discharge passage communicating with said passage in the cylinder head on one side of said plunger and with the first named tubular member below the second named tubular member, said passage in the cylinder head opening to the interior of said second tubular member on the opposite side of said plunger.

DAVID R. HILLIS.