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Publication numberUS381656 A
Publication typeGrant
Publication dateApr 24, 1888
Filing dateDec 29, 1837
Publication numberUS 381656 A, US 381656A, US-A-381656, US381656 A, US381656A
InventorsGeoege H. Thompson
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Ladder
US 381656 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

(No Model.) G. H. THOMPSON. 2 Sheets-Sheet L.

LADDER.

No. 381,656. Patented Apr. 24, 1888,

N PETERS, PuomiilncsmphuL Waw 'jnglan. o. C.

(No Model.) 2 Sheets -Sheet 2. G. H. THOMPSON.

LADDER.

Patented Apr. 24, 1888.

N. Firms. Phbwmna n mr. Washmgmn, D c.

UiviTnn STATns PATENT @rrrcn.

GEORGE H. THOMPSON, OF READING, PENNSYLVANIA.

LADDER.

SPECIFICATION forming part of Letters Patent. No. 381,656, dated April 2%, 1888.

Application filed December 29, 1837. Serial No. 259,300.

To aZZ whom it may concern..-

Be it known that I, GEORGE E. 'lnourrson, of Reading, in the county of Berks and State of Pennsylvania, have invented certain new and useful Improvements in Ladders; 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.

My invention relates to ladders, and more particularly to such as are used as fire-escapes.

The object of my present invention is to provide a fire-escape ladder which shall occupy but little space, and which will not disfigure the building to which it is applied.

A further object is to produce a ladder capable of being built with the building or placed in the structure during its construction.

A further object is to so construct the lad der that when not in use it wiil be out of sight and protected from the weather.

A further object is to construct the device in such a manner that it can be broughtinto use quickly and easily by any person.

A further object is to providca ladder with devices by which the occupants of the house maybe notified when the ladder is used by an unauthorized party.

A further object is to produce a fire-escape ladder which shall be simple in construction, possessing a due amount of strength, and coinparatively cheap to manufacture.

\Vith these objects in view my invention consists in the novel construction and peculiar combination and arrangement of parts, as

. will be hereinafter set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a front elevation of a building having my improved devices applied thereto. Fig. 2 is a vertical section of the same. Fig. 3 is a top plan view of one of the metallic boxes with the top plate removed and the parts in their normal positions. Fig. 4 is a similar View showing the step in position for use. Fig. 5 is a crosssection of a metallic brick or box and contained parts. Fig. 6 is aview of a modification.

A indicates a wall of a structure, built preferably of brick or masonry, and provided at suitable intervals from top to bottom with may be grasped (X0 model.)

boxes B, which will be hereinafter more fully described.

Vhen the building is not provided with .a cornice, the series of boxes will extend to within a few inches of the top of the wall, a bracket, 0, being secured to the roof or uppercxtremity of the wall and projected somewhat beyond the edge thereof, by means of. which persons may be aided in reaching the roof,- and this bracket may also serve as a support for a hose. Ifthe househe provided with a cornice, a short iron ladder, D, will be secured at one end to the roof D in any suitable manner, and at its other end to the wall Ain close proxi mity to the uppermost box, B. Each box Bis constructed of iron or other suitable material and about the size of an ordinary brick, having one of its side faces left open, as shown in Fig. 4. At each end of said. open face is an inwardly-projecting flange, a, which extends from the top of the box downwardly about three-quarters the thickness of the box, thus producing a re cess, b.

Made integral with or secured to the inner surfaces of the end plates of the box B,and in alignment with the lower end of the flanges a, are guide-strips c, which, together with the recesses b, serve as guides for a sliding step, E, as shown in Fig. i. This step E comprises a rectangular frame having the inner edge of its front connecting-bar, d, rounded, so that it without injury to the hand. An upwardly-projecting flange, F, is made integral with or secured to the inner surface of the bottom of the box B, near the open end thereof, and serves as a stop to limit the outward movement of the step E, sufficient space being left between the ends of the flange F and the ends of the box to permit the passage of the end connecting-bars of the step.

By constructing the step Eas above set forth it is rendered light and substantial, and by its arrangement within the box it is permitted to have a limited sliding movement in the same, and is capable of sustaining the weight of a person, being held in its rigid horizontal position by means of the strips 0.

Mounted upon the strips 0 is a sliding block, G, comprising a front plate adapted to produce a finish to the box B and form a continuous surface to the outer face thereof, and two" hollow end blocks, G. The hollow blocks G are provided on the inner surfaces of their bottom portions with laterally projecting pads or bearings 9, adapted to rest and slide upon the strips 0, thus permitting the front plate of the sliding block G to extend slightly below the strips 0 and make a close joint with the step when the device is out of use. By this arrangement the working parts of the device are protected from the weather, and, being made ofmetal, are kept free from rust, which would seriously injure the device and prevent its free and easyworking. The top portions of the hollow blocks G are projected slightly beyond the ends of the sliding block or plate G, as at h, and adapted to bear against the vertical flanges a and prevent the sliding block from projecting beyond the front surface of the box 0, the outeredges of the pads 9 also abutting against said flanges and serving the same office as the projections h.

Fixed to the inner surface of the back plate, 0 of the box B, and at or about the center thereof,is a bracket, H,having two parallel perforations,ij, made vertically through it. This bracket serves as a fulcrum for two levers, I J, which are passed loosely through these perforations 15 j, and are adapted to turn therein. The levers I J are preferably made of heavy brass or steel wire and bent in the form shown in Fig. 3. As shown in said figure, the lower portions of the levers are extended in opposite directions from the bracket H along the bottom of the box and parallel with the rear plate thereof, their extremities being bent upwardly and adapted to have a broad bearing upon the rear connecting-bar of the step E. Thelevers I J are bent upwardly at right angles at their inner ends and passed through the perforations i j of the bracket H. After passing through said bracket, the levers are bent at an obtuse angle to their lower portions, and, be-

ing crossed at a point near the bracket, are extended forwardly to the inner surface of the sliding block G, against which they are adapted to bear and have a sliding movement.

If desired, the inner face of the block G may be grooved to serve as guides for the ends of the lovers, and the opposite extremities of said levers may be guided by suitable guide-bars fixed to the rear connecting-barof the step E, although neither of these'provisions is essential.

The boxes or metallic bricks,v as I refer to term them, being thus constructed and arranged, are placed in the wall of a structure, eitherin its process of construction or after the completion of the building, as circumstances may require. If the buildingbe of thegeneral style of architecture shown in the drawings, there will preferably be one series of these boxes or bricks arranged in zigzag order from the top to near the bottom of the building at intervals of about the thickness of four or five bricks, the purpose of such zigzag arrangement being obvious. Other series of boxes or bricks may be arranged along the vertical edges of the walls, and others on the lower portions of the walls leading to the ground. Boxes will also advisably be placed over and under each window, to enable occupants of the house and firemen to get in and out of the windows. 7

In case oflarge buildings-such as hotelsthe arrangements of the boxes to produce an escape-ladder will be at the discretion of the builder.

In order to guard against the use of the ladder produced by the above-described arrangement of boxes and steps by unauthorized persons, a bell, K, is placed in each room of the building by which the ladder passes,and connected by means of a wire or otherwise to one of the working parts of the stepped boxes, said wire passing through the wall of the building and the rear plate of the box B. In case of a hotel, one of the working parts ofthe device will preferably be attached to the system of electric bells by means of suitable connections,and thus provide means for notifying the hotel-clerk of the improper use of the lad der.

When it is desired to use the ladder in descending,the block Got the first box B reached will be pressed inwardly by the hand, thereby causing the upper ends of the levers to slide along the inner surface of said block in reverse directions, and thus cause the levers to turn in the bracket H. The levers being made to turn, their upper arms will move rearwardly with the block G, and their lower extremities will move outwardly and push the step E forwardly beyond the front face oftlie box B. As the person on the ladder descends, he will operate the boxes beneath him by his foot; but

when a person is ascending the ladder the boxes will be operated by hand.

A modification of the operating parts of the device is shown in Fig. 6. In this modified construction the end connecting-bars of the steps E are provided with rack-bars k on their upper surface. A shaft, Z, isjournaled in the box and furnished near each end with a pinion, m, and a smaller pinion, n, the former beingadapted to mesh with the rack-bars 7c and the latter pinions, it, made to mesh with rackbars 0, fixed to the under edge of the blocks G near each end.

It is obvious that this device may be used in climbing high stacks of bricks and for ascending to the roof of a building under ordinary circumstanees. The boxes may be painted a different color from the bricks of the building, and thus be clearly distinguishable, and at the same time present an ornamental appearance to the building.

Slight changes might be made in the constructive details of my invention without de parting from the spirit thereof; henceI do not wish to limit myself to the precise details of construction herein set forth; but,

Having fully described my invention,what I claim as new, and desire to secure by Letters Patent, is

1. An angular box adapted to be set in the;

wall of a building and having a sliding step, and mechanism located within the box for moving the step outwardly, substantially as set forth.

2. An angular box adapted to be set in the wall of a building and having one open face and a sliding step located wholly within the box, the outer face of said step, when the latter is in its closed position, resting flush with the side edges of the open face of the box, substantially as set forth.

3. A ladder composed of aseries of boxes, a step in each box, mechanism for sliding said step, a stop to limit its outward movement, and strips in the box to sustain the weight brought to bear upon the step, substantially as set forth.

4. Aladder composed of a series of boxes, a step in each box, levers in the box, a stop for limiting the outward movement of the step, and mechanism for operating the levers to slide the step, substantially as set forth.

5. A ladder composed of a series of boxes, a step in each box, astop to limit the forward movementof said step,a sliding block mounted on bearings above the step, a bracket secured in the box, and levers fulcrumed in the bracket and bearing at their ends against the sliding block and the step, substantially as set forth.

6. A ladder composed of a series of boxes, a step in each box, astop to limit the forward movement of the step, a sliding block mounted in the box above the step, a bracket secured within the box, a pair of levers fulcrumed in the bracket and having their free lower ends bent at right angles to said brackets and adapted to bear against the step, and the upper ends of the levers bent at right angles to the bracket and made to cross at a point above the bracket and hear at their free extremities against the sliding block, substantially as set forth.

7. A ladder composed of a series of boxes having open faces and an inwardly'projecting flange at each end of the open face of each box, strips on the end plates of the box, a step in each box beneath said flanges and strips, a stop to limit the forward movement of the step, a sliding block provided with hol low boxes adapted to slide on said strips, and

levers fulcrumed in the box and hearing at their free ends upon the steps and sliding block, respectively, substantially as set forth.

8. A ladder composed. of a series of boxes, a step in each box, a stop to limit the forward movement of said step, a sliding block having hollow blocks fixed thereto, projecting pads secured to said hollow blocks and adapted to slide upon bearings above thestep, and levers fulcrumed in the box and bearing at their respective ends against the step and sliding block, substantially as set forth.

9. The combination, with a box adapted to be set into the wall of a building and having a sliding step, of a sliding block and inter mediate connections, whereby a movement imparted in one direction either to the step or block moves the other of said parts in the opposite direction.

10. The combination, with a building, of a series of boxes secured in the walls thereof and a sliding step in each box, substantially as set forth.

11. The combination, with a building, of a series of boxes secured in the walls thereof at suitable intervals, a sliding step in each box, a sliding block mounted in the box above the step, and levers fulerumed in the box and bearing upon the sliding block and step, respectively, substantially as set forth.

12. The combination, with a building, of a series of boxes secured in the walls thereof, a sliding step in each box, a sliding block mounted in the box above the step, and mechanism for operating said step and block to conceal the working parts of the device, or adapt the same for use, as desired, substantially as and for the purpose set forth.

13. The combination, with a building, of a series of boxes secured in a wall thereof, a sliding step in each box, and a bell connected with one of said steps, whereby when the step is moved the bell is sounded.

In testimony whereof I have signed this Specification in the presence of two subscribing witnesses.

GEORGE H. THOMPSON Witnesses:

J. 0. Ferrari, E. W. Fox.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4574916 *Jun 24, 1985Mar 11, 1986Hunt John TStep to safety
US4635729 *Jun 3, 1986Jan 13, 1987Canadian Patents And Development LimitedExtensible flame deflector
US5908082 *May 29, 1998Jun 1, 1999Turner; Wallace J.Fire escape ladder
Classifications
Cooperative ClassificationE06C7/003