US1190034A - Extensible fire-ladder. - Google Patents

Description

2 SHEETS-SHEET I Patented July 4, 1916.

S. STARCOVIC. EXTENSIBLE FIRE LADDER. APPLICATION mm um. u. we.

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S. STARCOVIC.

EXTENSIBLE FIRE LADDER.

APPLICATION FILED m4 n, 1916 2 SHEETS-SHEET 2.

Patented July 4, 1916.

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UNITED STATES STEVE STARCOVIC, OF SEDRO WOOLLEY, WASHINGTON.

EXTENSIIBLE FIRE-LADDER.

Specification of Letters Patent.

Patented July 4., 1916.

Application filed January 11, 1916. Serial N 0. 71,522.

To all whom it may concern:

Be it known that, I, S'rnvn STARCOVIC, a citizen of the United States, residing at Sedro lVoolley, in the county of Skagit, State of WVashington, have invented a new and useful Extensible F ire-Ladder; and I do hereby declare the following to 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.

This invention relates to an improved exfelrzisible fire ladder for fire trucks and the One of the objects of the invention is to provide an improved ladder of this design, which can be easily conveyed to the scene of fire, and subsequently quickly and easily extended, whereby the occupants of a building may be easily and quickly rescued.

Another object of the invention is the provision of an improved extensible ladder, comprising two sets of lazy tong levers or bars, one set in spaced parallelism to the other set, the bars of one set being connected to the corresponding bars of the opposite set by step or tread boards or plates, thereby permitting a person to easily ascend or descend.

Another object of the invention is the provision of improved means for manipulating the two series or sets .of lazy tong bars simultaneously, whereby they may be easily extended and collapsed or receded.

In practical fields the details of construction may necessitate alterations, falling within the scope of what is claimed.

The invention comprises further features and combination of parts, as hereinafter set forth, shown in the drawings and claimed.

In the drawings: Figure l is a view. in side elevation, showing two improved extensible ladders as applied to a truck, which is partly in section, and illustrating separate means for operating the extensible ladder, one of which extends vertically, and the other extends laterally and upwardly. Fig. 2 is a vertical sectionalwiew of the structure shown in Fig. 1. Fig. 3 is a sectional view on line 33 of Fig. 2. Fig. 4 is a view in perspective of a section or portion of the extensible ladder, more clearly showing the lazy tong bars or levers. Fig. 5 is a detail perspective view of the operating screw for operating the extensible ladder. Fig. 6 1llustrates detail views of the bracket for supporting a collar, in which the operating screw is threaded. Fig. 7 is an enlarged detail view on'line 77 of Fig. 3, showing parts in elevation. I Referring more especially to the draw= mgs, 1 designates a conventional form of platform of a fire truck or the like, and which platform is mounted upon the supporting axles 2 and supporting wheels 3. One side of the platform is provided with a recess 4, and secured to the edge of the platform as at 5 are brackets 6, in bearings of which the lateral pins 7 of the collar 8 are swivelly mounted. Rising from the platform 1 is avertical frame or housing 9, and secured to the opposite sides of the frame or housing 9 adjacent its lower portion, as shown at 10 are bars 11, and pivoted to the bars 11, adjacent the opposite sides of the housing or frame 9 are the forks 12 of the lever 13, and mounted in a bearing'of the lower end of the lever 13 is a lateral pin ll of a collar 15, thereby swivelly mounting the collar. An operating screw 16 having a hand wheel 17 is threaded through the collar 8 and through the collar 15, so that by manipulating the hand wheel 17 in one direction or the other, the collar 15 is fed laterally and downwardly, or laterally and upwardly, thereby rocking the lever 13. The laterally and upwardly extending extensible ladder comprises two sets of lazy tong bars or levers, one set be ing disposed in spaced parallelism to the opposite set, and the bars or levers of each ,set are pivotally united as at 19 and 20..

However, the bars that remain substantially horizontally, whether the laterally and upwardly extending ladder is extended or collapsed, that is, of both sets of lazy tong bars, are connected by the transverse steps or tread plates 21. It is to be noted that the lowermost lazy tong bars or lovers of both sets are.pivoted at 22 and 23 to the bars 11 and the forks 12 of the lever 13. The lowermost pivot pins 20 are extended inwardly and are mounted in the guide slots 24;, which are formed partially in the sides of the upright frame 9 and the extension bars 25, thereby reinforcing and more thoroughly supporting the ladder when extended. It is to be observed that from manipulating the hand wheel 17, the screw 16 is rotated in one direction or the other, thereby feeding the collar in one direction or the other on the screw, which will oscillate the lever 13 in one direction or the other, thereby in turn extend or collapse the ladder. The

:: vertical ladder, however, comprises a single set of lazy tong bars or levers 27, which are pivotally united as at 28 and 29. It is to be observed that the lowermost pivot pins 28 are extended, as shown in Fig. 3, and have their opposite ends engaging the guide slots 30, in the opposite walls of the casing or frame 9, so as to guide said pivots 28 in their vertical movement, that is, when extending the ladder, which consists of the single set of lazy tong bars or levers.

Mounted in bearings 31 and 32 of the casing or frame is a shaft 33 having a hand wheel 3i, and provided with right and left threads and 36, which are err gaged by the correspondingly threaded collars 37 and 38. The lowermost intersecting or pivoted lazy tong bars of the single lad der have their lowermost ends pivoted at 39 to the collars 37 and 38, so that when the hand wheel is rotated in one direction or the other, the right and left threads 35 and 36 will act to move the collars 37 and 38 toward and from one another, which action will either extend or collapse the single set of lazy tong bars or levers. The party or person who ascends or descends the ladder consisting of a single set of lazy tong bars or levers treads in the crotch 41 adjacent where the bars or levers are pivoted at '28. Also pivoted at 39 are the links or levers 42, which are in turn pivoted together at i3, and are designed to steady and reinforce the collars as they are moved toward and from each other.

The invention having been set forth, what is claimed as new and useful is:

In combination, a truck body, a frame on said body and having upwardly and later ally protruding extensions, one being di rectly opposite the other, said frame having slots extending correspondingly with the extensions and into the extensions, an extensible and collapsible ladder extending laterally and upwardly, said ladder comprising two sets of lazy tong bars, one set being in spaced parallel relation to the other, the corresponding bars of both sets having tread step connections, the lowermost bars of both sets having their pivotal connection engaging said slots, one of the lowermost bars of each set being pivoted to the frame, a lever pivoted in the frame and having a fork at its upper end and the single arm at its lower end, one end of each of the other lowermost lazy tong bars being connected to each arm of the fork, a collar swiveled to the lower end of the'single arm of the forked lever, a bracket on the body, a collar swiveled in said bracket, and a screw threaded through said collars, for extending and collapsing the ladder.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

STEVE STARCOVIG. Witnesses:

V. V. KIRBY, JAMES ROWLAND.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. G.

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