US1768794A - Ventilating system - Google Patents

Description

J. SHEARD ILIATING sY s'rEM "July 1, 1930.

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l atentecl July 1 1 930 UNITED STATESPATENT OFFICE JOSEPH H. SHEARD, or PHILADELPHIA, rEN 'sYLvAN'IA, ASSIGNOR TO DAVID 'LUPTONS SONS COMPANY, OF. PHILADELPHIA, rEnNsYLv NIA, A CORPORATION OF PENNSYLVANIA.

' vnnr rA'rrne SYSTEM,

Application filed October 22, 1928'. Serial No. 314,000.

'This invention relates to ventilating systerns for industrial plants, and more particularly to plants devoted to the production of explosives, or in which explosives arefem- .ployed, or explodable materials or gases developed incidental to manufacturing proc- .The purpose of my invention is to afford, in'the event of explosions within buildings or other enclosures instant relief ofthe generated pressure and release of gases, thereby to minimize, as far, as possible in such emergencies, destruction of the plants, as well as casualties among the workers. These de-- siderata I attain through provision of a protective ventilating system, with operating.

In the drawings Fig. I is a fragmentary? plan :view of a ventilating system with closure operating mechanism convenientlyxem bodying my invention. A

Fig. IIzis a part elevation and part longitudinal fragmentary detail sectional. view showing one of the component elements of the closure operating mechanism; and

Fig. 111 is a vertical section on the plane designated IIIIIIin Fig. I.

.VVith more detailed reference first more particularly to Fig. I, comprehensively designates a ventilator closure in the form of a sash whichis tobe considered as one of a series (not shown) all individually The sash 5 maybestandard in design and construction, with horizontals 6 and connect ing verticals 7 to supportpanes of glass, not

shown. it is to be assumed that each sash 5 in the system is in the present instance pivoted along its upperedge so as to swing laterally outward, -i. e. in the direction of the arrow at the upper right hand in the illustration. The operating mechanism for the sash comprises a pair of arms 8, 9 which are iulcrumed at 10-, 11 to a stationary supporting structure 12 and swung by means.

including 'aiscrewshaft 13 which is reversely threaded at opposite ends as conventionally indicated. Thisscrew shaft 13 is rotatably journalled in the lateral slot 18 of a bearer housing'lal on the "supporting structure 12, andfit is actuated by a centrally-mounted cord or chain pulley 15. Engaged with the IBVQTSGly-tl'IIZGadGd ends of the screw shaft 13- are-collars 16,17having pivotal connection at 18,'19 with'thearms 8, 9. Thus as the pulley 1:5 is'rotated in one direction or the other, thecollars 1'6, 17 are moved toward or. away from each other while the screw shaft 13 is concurrently moved laterally with impartation of corresponding swinging movement to the arms 8 and 9. Securedat'an-angle to the arms ,8, 9 are cross pieces20, 21 which atone end are pivotally connected as-at 22,123 with coordinating rods 24, 25 thatextend to similar arms associated with the other sashes of the system in series withthe sash :5. :The opposite'ends of the cross pieces 20, 21 are pivotal'ly coordinated at 26, 27 with extensile links 28, 29 which are in turn pivotally connected at their opposite ends .to the lower edge of the sash 5 as indicated at 30, 31. v The extensile links 28' 29 are exactly alike in construction, one of. them being detailed in FigAII. As there shown, each such link comprises two sliding tubular ;ccmponents 3'2, 33 whereof the smaller telescopes into the larger. The outer end oi the inner tube 38 is flattened with provision of'lan ear-1.34 for pivotal at: tachmentg-at-26zto the cross piece 20 ofthe a-rni18; :while the larger tube 32 is similarly flattenedat-its outer end to provide a lug35, which, conjointly with 'a separately attached lug 36, forms a clevis for pivotal connection at 30 to the sash 5. Within its hollow at the inner end, the smaller tube 33 of the link carries a ivoted pawl 37 which is subject-to the in uence of a helical spring 38 tending to maintain its free end engaged with notches 39, 39 at intervals along the length of the outer tube 32. Normally the pawl 37 is engaged with the notch 39 nearest the fulcrum point 30 with the link 28 or 29 fully contracted. As shown, the

smaller tubular link component 33 enters the larger one 32 through an adjustable friction means generall designated by the numeral 40. This friction means 40 includes a cap piece 41 which has threaded engagement with the outer end of the tube 32 and houses a pair of gland rings 42, with packing 43 inter osed. As the cap piece 41 is tightened up, t e packing 43 will obviously be compressed with maintenance of frictional restraint to prevent rattling of the sashes 5 as well as to prevent distention of the links 33 incidental to ordinary use of the sash operating mechanism.

Under normal actuation of the sash 5'the links 28, 29 function as thrust members to communicate the movement of the arms 8, 9 to the sash 5, thereby to swing the latter to open position. In the event of an explosion the sash 5 and others in series with it are left free to open by virtue of the telescopic or extensile character of the links 28, 29. In other words, as pressure acts upon the sashes, resistance of the friction means 40 is overcome to the end that the smaller tubular components 33 of the links 28, 29 will slide forwardly within the larger tubes 32. As the action roceeds, the pawls 37 disengage automatical y from. the notches 39 and enter one of the notches 39 beyond. The whole group of sashes 5 are thereby locked in open position with instant relief of the internal pressure and release of smoke or fumes attendant upon an explosion within the building. My invention thus afiords an effective safeguard against destruction of both life and property.

To subsequently restore the links 28, 29

i to normal condition, the pawls 37 may in each instance be pressed inward for passage by the several notches 39 until once again registered within the notch 39; or the small tube 33 may be disconnected and turned part way around to take the pawl 37 out of the province of the notches 39 during shifting, and finally turned back into position for said pawl to engage the notch 39.

In practice, the several parts constitutin the extensile members 28, 29 of the sas operating mechanism are constructed from non-corroding materials to insure of absolute dependability for operation in emergencies. While I have shown and described my invention in connection with a system of ventilating sashes 5 for use in buildings, it 1s not to be construed as so limited, since the principle involved is applicable to other closure systems, such for example as doors of bulkheads in mines, etc.

Having thus described my invention, I claim:

1. In a ventilating system of the character described, a closure and mechanism for normally 0 crating it, said mechanism embodying te escopic tubular means permitting the closure to open automatically under pressure of ex losions.-

2. In a ventilating system of the character described, a closure and mechanism for normally operating it, said mechanism embodying extensile members permitting automatic opening of the closure under pressure of ex losions.

3. n a ventilating system of the character described, a closure and mechanism for normally operating it, said mechanism embodying extensile members with sliding com onents permitting automatic opening of the closure under pressure of explosions.

4. In a building ventilating system of the character described, mechanism for normally operating it, said mechanism embodying extensile members with telescoping components permitting the closure to open automatically under pressure of ex losions.

'5. n a building ventilating system of the character described, a closure and mechanism for normally operating it, said mechanism embodying extensile means permitting the closure to open automatically under pressure of explosions, and means to lock the closure against shutting when automatically opened in the manner indicated.

7 6; In a ventilating system of the character described, a closure and mechanism for normally operating it, said mechanism embodying extensile members permitting the closure to open automatically under pressure of explosions, and friction means associated with the extensile members to prevent rattling of the closure and distention of the extensile members incidental to normal operation.

7. In a ventilating system of the character described, a closure and mechanism for normally operating it embodying extensile members permitting the closure to open automatically under pressure of explosions, said extenslle members comprising two relatively slidable parts, one of such parts carrying means to automatically interlock with the other when in extended position,

thereb to hold the closure against shutting after aving been automatically opened in the manner indicated.

8. In a ventilating system of the character described, a closure and mechanism for a closure and normally operating it embodying extensile members permitting the closure to open automatically under pressure of explosions, said members comprising relatively slidable components, one carrying a spring pressed pawl to engage a notch in the other when in extended position, thereby to hold the closure against shutting after having been automatically opened in the manner indicated.

In testimony whereof, I have hereunto signed my name at Philadelphia, Pennsyl- Vania, this 13th day of October, 1928.

JOSEPH H. SHEARD.

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