US1884304A - Fume hood for laboratory tables - Google Patents

Description

Oct. 25, 1932. E. H. SHELDON- FUME HOOD FOR LABORATORY TABLES 5 Shets-Sheet 1 Filed Sept. 2, 1924 5, 1932- E. H. SHELDON FUME HOOD FOR LABORATORY TABLES Filed Sept. 2, 1924 5 Sheets-Sheet 2 -imiliiiwliiiiii-1111} rii|ll$ Oct. 25, 1932. E. H. SHELDON FUME HOOD FOR LABORATORY TABLES 5 Sheets-Sheet 3 Filed Sept. 2, 1924 iwerr/z n 7- Patented Oct. 25, 1932 I UNITEDfS A PATENT OFFICE E GAR H summon, OFMUSKEGON, MICHIGAN FUVME noon FOR LABORATORY TABLES Application filed September 2, 1924. Serial No. 735,226.

. My inventionc relates to fume hoods for laboratory tables.

, One of the objects of athe inventioni is to Fig. 2 is a plan view of the same with parts broken away for convenience of lllustration Fig. 3 is an end elevation of the same with parts broken away; and

in Fig. 3. Referring to the drawings, I show a portion of a table top 1 understood to be the'top of a laboratory table or other device which is to be provided with a fume hood.

Mounted on the table 1 is the fume hood comprising end uprights 2 and 3, and a top or cover 4 mounted on and extending becomprises a supporting member or portion 5 conveniently constructed of end members 5a5a and side members 5b,5b, connected- This top sup I with the end members 5a5a. porting member 5 is made hollow or tubular and is intended to receive the fumes rising from the table and the supporting standards or posts 2 and 3 are also hollow or tubular and are intended to receive the fumes from the member 5-and conduct the same downwardly and away in any desired manner, as for example, through pipes 88 extending down l from the under Slde of the mile the latter be having fume ducts communicating with the ing provided with apertures 9-9 affording and pipes 88.

To permit fumes to enter the member 5 the in the lower Walls of the, sides 5b-5b, and to broken away for convenience of illustration;

they may be removed to provide openings on the inner sides of the uprights 2 and 3-at the points therein just above the table top 1.

Fig. 4 is a cross section taken on line 4r4:

tween the uprights 2 and 3. The top t communication between standards 2 and 3 permit control of the fumes entering these slots" andthe concentration of thefumes as desired, dampers 1212 are provided having controlling handles 14-14, whereby: the slides 12-12 may be moved lengthwise of the -jci members 5?) to close diiferentportions of these slots l111., L r c A table top plate 15 is. provided, the same being secured at its edges to the member 5 V and covering the space formed by said mom-Hi her 5. This prevents fumes from escaping through the area within the sides and ends of the member 5' and causes them to move outwardlyand enter the slots 11'11, to which slots the fumes are drawn by suctionapplied to the pipes 88. Y L

, To take care of heavy fumes near the table top, dampers I 17-17 are provided, said dampers having handles 1818 by which From the foregoing it will :be seen that a highly eflicient fume hood construction is providedin which themovement of the fumes 75 may be readily controlled by dampers. It

willalso, be seen that the construction creates 1 air suction currents atmore nearly the points at which the fumes" are created, and that less suction is required to accomplish fume elimi-s,;

nation. Also' that the shape of the ducts is such as to offer less resistance to the air currents a's they pass down through the ducts.

It will be understood that changes and modifications may be made without departing from the spirit of the invention.

WhatI claim is:' f 1.,A fume hood having a hollow member eite'ndingaround its outer edge and provided with fume inlet openings, and uprights at the outer edges of'said fume hood on which said hollow member is mounted, said uprights interior of said hollow member.

2., A. fume hood comprising hollow uprights and a top structure mounted thereon,

said structure being provided with marginal fume inlets and also with ducts communicating with said inlets and also with said hollow uprights, and means controlling the entrance of fumes into said marginal inlets.

3. A fume hood comprising hollow uprights and a top structure mounted thereon, said structure being provided with marginal fume inlets and also with ducts communicating with said inlets and also with said hollow uprights, and means controlling the entrance of fumes'into said marginal inlets, said controlling means comprising sliding dampers.

4. A fume hood comprising hollow uprights and a top structure mounted thereon, said structure being provided with marginal fume inlets and also with ducts communicating with. said inlets and also with said hollow uprights, and means controlling the entrance of fumes into said marginal inlets,

said uprights being provided with means at their lower ends for permitting heavy fumes to enter said uprights.

5. A fume hood comprising hollow uprights and a top structure mounted thereon,

said structure being provided with marginal fume inlets and also with ducts communicating with said inlets and also with said hollow or tubular uprights, and means controlling the entrance of fumes into said marginal inlets, said uprights being provided with means at their lower ends for permitting heavy fumes to enter said uprights, and means for controlling said last mentioned inlet means.

6. A fume hood comprising hollow uprights and a top member mounted thereon, said top member consisting of an endless tubular member and a top plate extending across and secured to said tubular member so as to c over the space enclosed by the same, said tubular member being provided with longitudinally extending fume inlet openings and being mounted upon said hollow uprights at points between said longitudinally extending openings, the portions of said tubular member mounted on said hollow uprights communicating with the interior thereof.

7 A fume hood comprising hollow uprights having flaring'upper ends, a top member mounted onsaid uprights, said top memprovided with fume inlets and whose ends communicate with said uprights so as to convey fumes from said inlets to said uprights, and dampers controlling said fume inlets, said uprights being provided with damper controlled inlets near their lower ends.

9. A device of the class specified compris ing a substantially flat fume gathering struc ture composed of a substantially rectangular E endless tubular member and a flat plate member supported by and seeuredto said tubular member and eXtending-acrossthe space enclosed by the same, said tubular member having. its sides provided with longitudinally extending fume inlets and its ends provided with fume outlets and supporting members for said tubular member supporting the ends ofisaid tubular member and provided with ducts communicating with the {)ume outlets in the ends of said tubular mem- 10, A-fu-mehood havinga downwardly extending marginal rim having its bottom pro vided with fume inlets.

11. A fume hood provided with-elevated fume inlets forthe gases lighter than air and with relatively low inlets forgases heavier than air.

In witness whereof, I hereunto subscribe

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