US1612977A - Grating - Google Patents

Description

Jan. 4,1927. 1,612,977

J. A. LUNDSTEADY GRATING Filed April 2. 1926 2 5 Hlll /5 Q h l my "I I I7, 73

' JofizzA Lzziggi Patented Jan. 4, 1927. f

UNITED STATES JOHN A. Lmms'rmm, or mrw vonx, 1v: Y.-

GRAEING.

Application filed April 8, 1928. Serial No. 88,348.

This invention relates to improvements in gratings and is especially adapted for subway coverings for ventilating purposes, although the same may be easily useful for 6 any other purpose for which gratings are used.

The primary object of the invention rcsides in a grating in which parts constituting the grating co-act to'provide an even tread'surface over which hand trucks and the like may pass without subjecting the same to undue shock.

Another object of the invention is the provision of a grating which is constructed of a plurality of separable'partswhich co-actto provide an even treadsurface, and means for removably locking the parts in assembled position so as to permit of the removal of any of the parts in the event of damage or wear to the same.

f A further object is to provide a grating of great strength and rigidity and which may be constructed at a minimum cost bothas to material and labor. With these and other objects in view, the

invention resides in certain novel construction and combination and arrangement of parts the essential features of which are hereinafter fully described, are particularly pointed out in the appended claims, and are illustrated in the accompanying drawing, in which Figure 1 is a top plan view of my improved grating, Figure 2 is a vertical lon itudinal sectional view on the line 22 of igure 1.

Figure 3 is a vertical transverse sectional view on the line 3-3 of Figure 2.

Figure 4 is a detail perspective view of one of the tie bars. Figure 5 is a detail perspective view of one of the -ring members.

Figure 6 is a detail sectional view of aslight modification. Referring more particularly to the drawing, the reference numeral 10 designates m improved grating in its, entirety and whic includes a plurality of equi-distantly spaced longitudinal tie bars 11 which are provided with suitable spaced notches or slots 12 which open on to the upper edge of the same. The notches or slots 12 of one bar are staggered with respect to the next adjacent bar,

but are in alignment with the notches in" every other bar for a purpose now to be explained.

Supported by the tie bars in transverse 4 rows are inserts in the nature'of ring mem bers 13, having diametrically o posed slots 14 therein which open on to the ottom edge of the ring members. The ring members are of such diameter as to fit down over the respective tie bars with the slots 12 of the tie bars receiving the ring member and the slots 14 in the ring members receiving the tie bars. Briefly the rings interlock with the tie bars to prevent circumferential creeping of the same, and when in such position the top edges of the ring members and the top edges of the tie bars are in perfect alignment. The members 13 which interlock with the outer longitudinal tie bars are semi-circular in plan view, in order that a perfectly straight wall may be provided.

For the purpose of locking the members 13 and 13 and tie bars in assembled position, I provide the tie bars with transversely aligned openings 15 with which diametrically opposed openings 16 in the members automatically align when the members are fitted into position upon the tie bars. The openings 15 and 16 pass through the bars and ring members at the top edge of the same, so that the key or lock bar 17 will readily pass through the aligned openings in such manner that the top surface of the lock bars are flush with the top edges of the tie bars and ring members. It will therefore be seen that the top faces of all of the parts are flush which affords a-relatively even tread surface to allow truck wheels and the like to pass over without causing undue vibration of the truck. The segmental openings in the grate are of such size as not to permit a shoe heel to become caught, but provides sufiicient open space for ventilating pur- Doses.

Should it become necssary to remove any of the ring members due to wear, the lock bar'which may be engaging that particular member is withdrawn from the registering openings, whereupon the ring members may be lifted out of place and readily replaced by new ones. grating would be constructed of a plurality of units such as shown in the drawing.

In Figure 6 of the drawing, I have shown a slightly modified form of. lock bar 17 which is square in cross section instead of round This bar passes through square In practice, a relatively large openings in the tie bars and rings, so that one of the sharp pornersof the lock baris of the ring and the bars eretofore n1em1oned.,-

\Vhile I have described what I deem to be the most desirable embodiment of my invention, it is obvious that many of the details may be varied without in any way dcparting from the spirit of my invention, and I therefore do not limitmyself to the exact details of construction herein set forth nor to an thing less than the whole of my invention imited only by the appended claims.

What is claimed as new is:

1..A grating comprising a plurality of parallel tie bars, transverse rows of members supported by said tie bars, and lock bars passing through the respective rows of members and tie bars for locking said members with said tie bars, the u per surfaces of said tie bars, member and ock bars being flush with respect to each other. a 2. A'- grating comprising a plurality of spaced arallel tie bars, transverse rows of relative y open members, each row of said members bemg staggered with respect to the nextadjacent row, interlocking means between said tie bars and said members, and a lock bar passing through each row of members and tie bars, the upper surfaces of said tie bars, members, and lock bars being flush with respect to each other.

3. A grating eomprisin a plurality of spaced parallel tie bars aving slots extending inwardly from their top edges, ring members having diametrically opposed slots therein registerim with the slots in said tie .bars, the slotsbemg of depth as todispose diametrically opposed slots therein rcgistering with the slots in the bars and diametrically opposed openings disposed at right angle to said slots for automatically registering with the openings in said tie bais when the ring members are in position thereon, and lock bars passing through the registering openings in said tie bars and ring members.

5. A grating comprising a plurality of parallel tie bars, continuous bands supported by said tie bars, interlocking means between said tie bars and said continuous bands, and lock bars passing through the aligned bands and the transverse tie bars for locking said bands to said tie bars.

In testimony whereof I have afiixed my signature.

JOHN A. LUNDSTEAD.

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