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Publication numberUS555542 A
Publication typeGrant
Publication dateMar 3, 1896
Publication numberUS 555542 A, US 555542A, US-A-555542, US555542 A, US555542A
InventorsJohn Hamilton Throop
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Stage apparatus for boats or vessels
US 555542 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

A 3 Sheets-Sheet 1. J. H. THROOP.

Patented Mar. 8, 1896.


(No Model.)

Wiigzss I M/. aid/W4 @y M 3 Sheets-Sheet 2.

(N0 Model.) I


STAGE APPARATUS FOR BOATS 0R VESSEIS. No. 555,542. Patented Mar. 3, 1896.


Patented Mar. 3, 1896.-



SPECIFICATION forming part of Letters Patent No. 555,542, dated March 3, 1896. Applicationfiled November 13, 1894. Serial No. 528,663. (No model.)

To all whom it may concern:

Be it known that 1, JOHN HAMILTON THROOP, a citizen of the United States, residing at Evansville, in the county of Vanderburg and State of Indiana, have invented a new and useful Stage Apparatus for Boats or Vessels, of which the following is a specification.

' This invention relates to stage apparatus for boats and vessels, and particularly for river steamboats.

To this end the main and primary object of the present invention is to provide a new and useful apparatus of this character for shifting the heavy staging or platforms such as are ordinarily employed for transferring freight and passengers to and from steamboats and other vessels, and particularly to provide an apparatus that will be strong, comparatively light, and easily handled.

Furthermore, the invention contemplates a construction of stage-handling apparatus for boats and vessels that will dispense with the use of the heavy wooden apparatus that has heretofore been used and at the same time will provide simple and efficient means for quickly and easily raising and lowering the staging, and also to make provision for automatically returning the staging forward over the forward deck of the boat or vessel when the same has been hoisted up from the wharf or bank where a landing has been made.

With-these and other objects in view, which will readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination, and arrangement of parts hereinafter more fully described, illustrated, and claimed.

In the drawings, Figure 1 is a perspective view of the herein-described staging apparatus shown applied to an ordinary river steamboat of that type commonly used on southern and western rivers. Fig. 2 is a side elevation of the apparatus. Fig. 3 is a detail view of the hanger for the stage or platform. Fig. 4c is a detail sectional view on the line 00 a: of Fig. 2. Fig. 5 is a detail plan view of the connection of the adjustable guy-rods with the swinging boom. Fig. 6 is a side elevation of a modified form of the apparatus, showing the substitution of a swinging wooden boom for the tubular metal boom. Fig. 7 is a similar view showing the employment of an extra guide-wheel for the hoistingcable to multiply the lifting power of the apparatus. Referring to the accompanying drawings, 1 designates an upright tubular mast prefer ably consisting of suitable lengths of pipe securely jointed together to provide the proper length of mast that is adapted to be arranged at the forward end of an ordinary boat or vessel, such as illustrated in Fig. 1 of the drawings, and when adapted for use in connection with an ordinary river steamboat said mast extends above the hurricane-deck of the boat to provide for properly handling the heavy stage or platform without at all interfering with the other workings of the boat.

The upright tubular mast 1 is seated atits lower end in a base-plate 2, that issecured to the working deck of the boat or vessel, and the upper end of the mast has fitted thereto the socket-cap 3, that is adapted to receive the lower end of a flag-pole at, which may be thus conveniently placed at the forward end of the boat or vessel. The said mast has securely clamped on the upper end thereof, directly below the socket-cap 3, the sectional collar-casting 5, provided at its front sides with the parallel bracket-plates 6, and at other points with the vertically-disposed flanges 7, to which are pivotally bolted the connectingloops 8, which have connected thereto the upper ends of the diagonal guy-rods 9, that extend to suitable points of the boat or vessel, where they are securely fastened for the purpose of firmly bracing and strengthening the upper end of the mast. lower end the said mast has securely clamped thereon a sectional collar-casting 10, similar in construction to the casting 5 and providing means for strengthening the mast at that particular point, and wherever the tubular mast is jointed similar castings to the castings 5 and 10 are placed to strengthen the same. At a point intermediate of its ends the tubular mast 1 has securely clamped thereto the collar-casting 11, that is provided at its front side with the parallel bracket-plates 12, between which plates is pivoted on the verticallydisposed pivot-pin 13 the bifurcated swivel-plate 14, in the bifurcation of which is pivoted, on the pivot 15, the inner end of the swinging tubular boom 16. The swinging At a point near its tubular boom 16 consists of a suitable length of pipe capable of withstanding the heavy work and weight placed on the same, while at the same time being sufiiciently light so as to be easily handled.

The swinging tubular boom 16 has securely fitted to both its outer and inner ends the longitudinally-slotted sheave-castings 17, within which are journaled the end wheels or pulleys 18, over which passes the wire hoisting-cable 19, that is employed in raising and lowering the stage or platform. The said boom 16 is longitudinally strengthened throughout its entire length by a series of bowed truss-rods 20, that are securely connected at their opposite ends to the end collars 21, located at the extremities of the boom, and are held taut away from and surrounding the boom by means of the circularly-grooped radial bracearms The radial brace-arms 22 of each circular group are of the same length, and are provided at their outer ends with the rod'eyes 23, through which pass the truss-rods 20, and the inner ends of said arms 22 are fitted into the radially-disposed sockets 21 of the collars 95, that are tightly fitted 011 the boom at regularly-spaced points.

The radially-disposed brace-arms 22, which are grouped in circular series on the spacecollars, regularly decrease in length toward the ends of the boom, in order to maintain the truss-rods 2O properly bowed away from the boom, whereby the greatest possible trussin g or strengthening of the said boom may be secured, and the said truss-rods 20 are provided at suitable points with the ordinary adjusting swivels or turnbuckles 26, which provide means for tightening the truss-rods to keep the same properly stretched. Near its outer end and at regularly-spaced points toward the inner end the said tubular boom 16 has clamped thereon the sectional attaching-bands 27, to opposite sides of which are connected the terminals of the guy slings or loops 28, to which are connected one end of the adjustable boom-supporting guy-rods 29, which are connected at their other ends to the pivoted clevis 30, which is pivotally mounted between the parallel bracket-plates 6 at the upper end of the mast on the vertical clevis-pin 31.

The boom-supporting guy-rods 29 serve to support the 'boom 16 at any desired angle, and at this point attention is directed to the fact that when used in connection with riversteamboats such as illustrated in the drawings the swinging boom is pivotallyconnected with the mast at a point above the hurricanedeck, and therefore above the electric light and all other \vorkin g parts of the boat, with the operation of which low booms always soriously interfere.

By reason of the specific connection of the inclined swinging boom with the mast it will be obvious that the said boom can be easily swung at direct right angles to the mast at either side of the boat, and the vertically-disposed pivot-pin 13 for the inner end of the boom is out of vertical alignment with the vertical clcvis-pin 31, which pivotally connects the boom-supporting guy-rods with the upper end of the mast, and said pin 13 is nearer to the mast 1 than the pin 31, thereby providing an arrangement which admits the swinging of the boom to either side of the vessel with safety, while at the same time with comparative ease, and also provides means for automatically returning the swinging boom back over the forward part of the vessel in front of the mast when released, as will be obvious.

The wire hoisting-"cable 19 is arranged to have the inner portion thereof which passes over the innermost wheel 18 to pass through the guide-pulley 32 that is attached to the mast 1 by the strap 33, and thence to the usual steam hoisting device with which boats and vessels requiring staging apparatus are provided. The outer extremity of the cable 19 is permanently attached to the attaching collar 34 at the outer end of the boom 16, and the portion of the cable between the collar 34: and the outermost wheel 18 passes around and supports the hoisting wheel or pulley 35. The hoisting wheel or pulley 35 is journaled in a skeleton sheaveframe 36, mounted centrally on a hanger-bar 37, and firmly braced to such bar 37 by the diagonal side bracerods 38. The hanger-bar37 is made of angle or other suitable shaped iron and has loosely connected to the opposite ends thereof the upper ends of the hanger-wires 39, the lower ends of which are loosely connected with the triangular offstanding brackets 40, secured to the opposite sides of the ordinary stage or platform -11 employed in connection with a boat or other vessel.

To employ the herein-described apparatus, it is simply necessary for the stage or platform to be lowered by means of the single cable 15) and then swung around over the side of the boat or vessel where the landing is made. \Vhen the transfer of passengers or freight over the stage or platform has been made, the same is hoisted up to the desired height, and as the said stage or platform is being hoisted the disposition of the pivots 13 and 31 will cause the boom to swing automatically to its inoperative position over the forward deck of the vessel, and the rapidity of this automatic swing of the boom maybe regulated according to the distance of the elevis pin or pivot 31 from the front side of the mast.

Changes in the form, proportion, and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention, and at this point attention is directed to the modifications of the apparatus shown in Figs. 6 and 7 of the drawings.

In Fig. (3 of the drawings is illustrated a form of the apparatus in which a swinging wooden boom 16 is substituted for the tubular metal boom 16 herein described. In some cases the wooden boom would be preferable to the metal boom, especially where it is only necessary to modify an ordinary wooden boom that has been in use to adapt the same for use in connection with the herein-described apparatus, and in the use of the wooden boom in place of the metal boom the only material modification to be noted is that with the wooden boom the truss-rods 20 and the braces therefor are dispensed with as being unnecessary, but all other parts of the apparatus herein described, excepting the parts referred to, are used in connection with the wooden boom.

As a further modification in connection with the wooden-boom form of the apparatus, it is to be noted that the number of wheels around which the hoisting-cable is reeved may be varied,aud, as illustrated in Fig, 7 of the drawings, an extra guide wheel or pulley 42 may be mounted on the wooden boom near the outer end wheel or pulley 18, and in this modification the outermost portion of the hoistingcable is reeved around the top portion of the outermost wheel 18, and is made fast to the skeleton sheave-frame 36 for the wheel or pulley 35, mounted on the hanger-bar 37, for the stage or platform. It will be obvious that in this arrangement of the wheels or pulleys for the hoisting-cable the lifting capacity of the apparatus will be greatly increased.

Whether the apparatus employs a metal or a wooden boom, particular emphasis is to be laid upon the location of this boom with respect to the hurricane-deck of the boat or vessel. By reason of connecting the boom to the mast above the hurricane-deck of the boat or vessel the boom will be entirely out of the way of all working parts of such boat or vessel, alarger stage or platform can be used than has heretofore been possible, and such stage or platform can be hoisted much higher and more out of the way than heretofore, and other advantages in this connection will readily suggest themselves to those skilled in the art.

Having thus described the invention, what is claimed, and desired to besecured by Letters Patent, is-- 1. In a stage apparatus of the class described, an upright mast, collar castings clamped to the mast respectively at a point intermediate of the ends thereof and at its upper end and provided at their front sides with parallel bracket-plates, a swivel-plate pivotally mounted between the bracket-plates of the intermediate casting, an inclined swinging boom pivotally connected at its inner end to said swivel-plate, a pivoted clevis mounted between the bracket-plates of the upper casting and thepivot of which is disposedout of vertical alignment with the pivot of said swivel-plate, an adjustable boom-supporting guy-rod secured at one end to the boom and at the other end to said pivoted clevis, and the hoist for the stage, substantially as set forth.

2. In a stage apparatus of the class described, the upright tubular mast provided with collar-castings respectively at a point intermediate of both ends and near its upper end, an inclined swinging tubular boom swiveled at its inner end to the intermediate collar-casting and provided at its outer and inner ends with end wheels or pulleys, guy slings or loops connected at their terminals to opposite sides of the boom at spaced points, a clevis pivotally connected to the upper collar-casting of the mast, a series of adjustable boom-supporting guy-rods connected at one end to said guy slings or loops and at their other ends to said pivoted clevis, the single hoisting-cable arranged over said wheels or pulleys, and the stage-hanger connected with said cable, substantially as set forth.

3. In a stage apparatus for boats and vessels, the upright tubular mast, the inclined tubular swinging boom swiveled at its inner end to the mast and provided at its opposite ends with longitudinally-slotted sheave-castin gs having end collars, end wheels j ournaled in the slots of said castings, a series of regularly-spaced collars fitted at intervals on the boom and provided with a circular group of radially-disposed brace-arms having eyes at their outer ends, a series of longitudinal bowed truss-rods secured at their ends to the end collars of said castings and passed through the terminal eyes of said brace-arms, a series of guy-rods attached at one end to the boom and suitably connected with the mast near its upper end, the hoisting-cable, and the stagehanger suspended by said cable, substantially as set forth.

4. In a stage apparatus of the class described, the upright mast, a swinging boom pivotally connected to the mast, end wheels or pulleys journaled at the extremities of said boom, a single hoisting-cable arranged over said end wheels or pulleys and secured fast at its outer extremity to the outer end of the boom, a hanger-bar provided at an intermediate point with a braced skeleton sheaveframe, a hoisting wheel or pulley journaled in said sheave-frame and receiving therearound the outer portion of said hoisting-cable, the stage or platform, offstanding brackets secured to opposite sides of said stage or platform, and hanger-wires loosely connected at their lower ends to said brackets and at their upper ends to opposite ends of said hangerbar, substantially as set forth.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.





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US2521349 *Aug 1, 1946Sep 5, 1950Harry DiamondLoading bridge
US2617131 *Aug 26, 1948Nov 11, 1952Stanolind Oil And Gas CoLanding gear
US2629120 *Jul 22, 1947Feb 24, 1953Nelson Robert MDock plate
US4133067 *Dec 16, 1977Jan 9, 1979Bennett Ronald WArticulating gangway
US7877933Oct 20, 2003Feb 1, 2011Ihc Engineering Business LimitedMounting of offshore structures
US7984525Aug 1, 2005Jul 26, 2011Ihc Engineering Business LimitedAccess method between marine structures and apparatus
US8016519Feb 6, 2007Sep 13, 2011Ihc Engineering Business LimitedInstallation of offshore structures
US8127388 *Jul 31, 2006Mar 6, 2012Ihc Engineering Business LimitedGangway apparatus
Cooperative ClassificationB65G69/30