US1265686A - Trap-door. - Google Patents

Description

0. L. LINK,

TRAP DOOR.

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,Mw-5 v jall OLIVER L. LINK, 0F ST. CHARLES., MISSOUBJI.

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. Speciilcation of Letters Patent.

Patented May 1918.

@riginal applieationiled may 18, 1912, Serial No. 698,124. Divided and this application led Hay 23, 191e.

i Serial No. @M1493 To all whom it may concern: y

Be it known that I, OLIVER L. LINK, a citizen of the United States of America, residing at St. Charles, in the county of St. Charles and State of Missouri, have invented certain new and useful Improvements in 'Irap-Doors, of which the following is a specication. v

rlhis invention relates to trap doors, and is more especially designed for use in vestibule platforms of passenger cars, this being a division of my application filed May 13, 1912, Serial No. 698,124. vOne of the objects of this invention is to construct a trap door of a single sheet of light metal which is reinforced by forming ribs thereon adjacent the edges thereof. l i

Another object is to provide improved means for securingthe door facing or flooring to the door.

Other and further objects will appear in the specification, and be specifically pointed out in the appended claims, reference being had to the .accompanyin drawings exemplifying the invention, an in which,

Figure 1 is a plan view of this improved trap door, part of the iiooring being broken away.

v Fig. 2 is a cross section taken on the line 2-2, Fig. 1. y

Referring to the drawings: 1 designates a trap door which is made of light weight sheet metal and is reinforced' by the rectanlar rib 2 which is formed adjacent the edge of the door. This door is further reinforced by the pair of parallelly arranged ribs 3, said ribs merging at their ends into the rectangular rib 2. Formed between the ribs 2 and 3 are ii'at surfaces 4;. Formed between the pair of ribs 3 is a iat surface 5J This improved door is'secured to the sill 6 by the hinge members 7, one portion 8 of ea'chvof said hinge members being secured to said sill, and the other portions 9 thereof being secured to the under side of the door. Secured to the under side of the door against the'iiat surfaces 5 is a door operating mechanism 10, said mechanism 10 having a connecting rod 11 which is-pivotally secured at 12 to the' sill 6.

In constructing the reinforcing. ribs 2 andV 3, grooves 13 are formed on the door. These grooves are lled with a vplastic. material 14,

said material, when setting, adhering in the grooves. This lastic material provides means for securing the flooring 15 to the door. The ooring is securedto the plastic material by nails 16 which are driven through'said liooring and said plastic material, said nails being somewhat longer than the depth of the grooves 13. As the pointed end of the nail engages the bottom of the groove, it will be deflected and turned, as shown at 17, which will cause the nail to clench the plastic material, thereby holding the iiooring 15 securely in place. In order to hold the edges of the flooring 15 rmly against the trap door l, edging strips 18 are secured to the edges of said trap door by screws 19.

As it is desirable for trap doors of this character to be as compact as possibleon account of being operatively mounted in a minimized space, it is necessary that the operating mechanism be situated as closely to the under side of the trap door as possible. In this improved design of trap door', the door operating mechanism 10 is secured to the under side of the fiat surface 5, thereby sitting very closely against the trap door so that, when the door is opened, n0 objectionable parts will protrude into the descending passageway leading tothe steps of a car.

If necessary, a pair -of door operating mechanisms, such as 10, can be mounted against the under side of the flat surfaces 4. rI`he rectangular rib 2, being located` adjacent the edges of the door 1, provides means for reinforcing the outer surfaces of the door, whereas the parallel ribs 3 serve to reinforce the intermediate portion of the door. This design' of reinforcing will pro.- vide means of constructing a trap door of light weight material.

What I claim is:

v 1. A trap door made from a plate of sheet metal, said plate'having a 4rectangular rib formed thereon, and a pair of parallelly arranged ribs adjoining said rectangular rib, said plate 'having a fiat surface formed between said pair of ribs, said dat surface providing means of allowing a' door operating mechanism to be engaged closely against the under side of said plate.

2. A trap door for vestibule platforms comprising a plate of sheet metal, said plate toA

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