US985917A - Diaphragm-pump. - Google Patents

Description

0 l 9 1 7| n2 .PE LMN AUM EP NMW. Momu .Rm Gmo Lun Dm I L P P A Patented Mar. 7, 1911.`

2 SHEETS-SHEET 1.

hm, Wmf/ L. C. MGNEAL. DIAPHRAGM PUMP. APPLIGATIN FILED JUNE 27, 1910.

Patented Mar. 7, 191.-

Specication of Letters Eatent.

e. ne, or Boomsma, New Yoan.

:u .L ern-P.

raeeaeea ai. e, ieri.

Application le .Tune 27, 1910. Serial Ne. 599,@1.

plumps of the type in which a flexible diap ragm is employed in place of a piston.

The object of the invention generally stated, is to produce a pump oi Vthis kind which shall be simple in construction and efoient in operation. To these ends my improved diaphragm-pump is so constructed that oscillatin' movements are substituted for reciprocatmg or slidingmovements in the mechanism by which the dia hragm is.

actuated., A pump so constructed 1s particularly adapted .foruse as an air-pump, and .furthernovel features' of the invention reside in the form' of the pump-casing, by means of which it is adapted to coperate with the novel form of'diaphra ,the means for producing a Huid-tight jolnt at the" pivotal supporting-point of the diaphragm-mechanism, and the novel form of valve bywhich the inlet and outlet-passages of the pump-casing are controlled. Y

In the accoml anying drawings: Figure 1 is a longitudine7 vertical section on the line 1-1 in Fig. `2, of a pneumatic cleaning-device embodying a pump constructed in4 accordance with the present invention; Fig. 2 is a section on the line 2 2 in Fig. 1, looking from leftto right in said figure; Fig. 3 is an enlarged detail View of two of the air valves em loyed in connection with the pump; an Fig. 4 is a section on the line 4-4 1n Fig.` 3, looking upward in said' figure.

The illustrated embodiment of my invention comprise a diaphragm having a dexible marginal portion and a comparatively rigid middle portion, the latter being pivotally mounted so as. to oscillate from side to side of the general plane of the diaphragm. The dexible marginal portion comprises a sheet 5 of leather, or other suitable material, while the rigid portion comprises a plate 6, preferably of metal, which is pivoted upon a horizontal axis by means of trunnions 7 projectin rom the lateral edges of the plate t3.l socet 8 extends from the upper edge of the plate and is adapted to receive a handle 9 which may be of any convenient length. The rigid portion of the diaphragm comprises also two thin metal plates 10 and 11 which areolam ed on either side of the plate 6 by means o screw-bolts 1 2, and these plates serve as means for securing the rigid and flexible portions of the diaphra together, as the middle portion of the eather 5 is clamped vbetween the plates 10 and 6, as' shown'in Fig. 1.

The diaphragm above described is mounted within a casing which comprises a bodyvportion 13 and an endportion 14. These two portions of the casing are joined, in the plane of the diaphragm, by means of flanges 15 on the respectlve parts secured together by screw-bolts 16. The edgesV of the leather 5 are interposed between the flanges 15, and in this manner the diaphragm is held securel in place and is caused to divide the casing into two pumpchambers.

To prevent the escape of air from the pump-chambers at the pivotal support of the rigid diaphragm-member the u per margin 17 of the sheet 5 extends beyon the plate 10 and is bent outwardly upon the top of the casing, as shown in Fig. 1. A metal plate 18 is clamped down upon the margin 17 by means of screws 19, and in this way.

is prevented the escape of air at this point Vfrom the space between thediaphragm and the end-portion 14 of the casing. To perform the corresponding function for the other pump-chamber a second sheet 20 of flexible material is clamped between the plate 6 and the plate 11, and the sheet 20 as its upper margin 21 clamped against the upper surface of the casing by means of the late 18, `.which extends entirely around t e plate rfor this purpose. l

'lhe trunnions 7 ofthe diaphragm are journaled in bearingfblocks 23 which are mounted upon the clamping-plate 1'8. This plate carries also two buffers 24 of rubber, or other resilient material, which are engaged by lugs 25 on o posite sides of the plate 6 to limit the osci lating movement of the diaphragm.

The end portion 14 of the casing is inclined downwardly and outwardly so as to conform roughlyto the position occupied by the diaphragm in its vextreme left-hand position, and the indy-portion of the casing 1s provided with a artition 26 which occupies a similarrelation with the diaphragm when the latter is in itsl extreme right-hand position. In lthis manner pump-chambers are produced in which the clearance-space is limited, as is desirable to secure positive pump is controlled.

action in the pump. To further limit the clearance-space the lower corners of the pump-chambers are partly filled by sheetmetal boxes 27 and 28 which have the further function of valve-chambers for the valves by which the flow of air through the lThe valve-chamber 27 (Fig. 1) is divided by a vertical partition 29, andthe valvechamber, this action being produced chamber 28 is similarly divided by a partition 30. The valve-chamber 27 is provided, at'one side of the'partitionl 29, with an inletvalve 31, and at the other side with an outlet-valve 32, land the valve-chamber-28 is provided with corresponding valves 33 and- 34. Air is admittedl from the right-hand Iside of the partition 26=in the pump-casing through-an opening 35, and is then drawn throu h the valve-chamber 28 and through the et-valve 33 into the right-hand pumpy t e left-hand movement of the diaphragm to the position shown Fig. 1. At the same time air is expelled from the left-hand pum chamber through the outlet-valve 32, an4 the air so expelled escapes from the valvechamber 28 through a suitable opening (not shown) in the bottom of the casing. Upon the movement of the diaphragm in the opposite direction air is drawn into the lefthand pump-chamber through the inlet-valve 31, this air being supplied to the valvechamber 27 through a tube 37 connecting the valve-chamber with the body of the casing 13, as shown in Fig. 1. At the same time air is expelled from the right-hand v pump-chamber through the outlet-valve 34 v plates 4l and 42 which are pivot chamber 27 or'28 adjacent to two openings 39 in the wall which constitute the inlet or outlet openings, as the case may be. IIhe flexible material 38 is secured only at its middle portion, by means of studs 40 fixed the wall,

so that the ends of the liexible material are free to rnove toward and from the surface of the partition and thus to act as flap-valves to control `the two openings, respectively. In addition to the iiexible portion each Vvalve comprises two substantiallyd metal studs 40 so as to have a limited pivotal movement with theA iexible portion 38.

upon the- I Each of these plates is provided with an' up- Wardly-extending arm 43, and a rod 44 passes 'loosely through openings in the two arms, being secured therein by heads at its ends. Upon the rod 44 is a compressionspring 45 Ywhich engages the arms 43 at its respective ends. l

The valve construction above described is such that both ends 'of the flexible valvemember 38 are held to their seats with substantially-equal pressure, owing to the fact that the action of the spring 45 on the plates -41 and 42is necessarily equal,`whate ver the position of the valvemay be. This arrangement has' the further advantage that the valve may be vquickly and convenient-ly removed from its position when nessary for cleaning or repair. To this end the openings 48 which engage the studs 40 are made of key-hole form, so that by slightly compressing the spring 45 and moving the plates 41 and' 42 toward each other the largeends of the openings may be brought beneath the heads of the studs 40, and the plates may then be at once -removed from thestuds, thus permitting convenient access to, or removal of, the flexiblepart 38 of the valve.

. The inclined position of the front walls of the valve-chambers 27 'and 28, in addition to restricting the clearance-space in the pump-chambers as above described, has the further advantage that it tends to maintain the valves free from any particles ofdust or dirt which might otherwise remain'upon the valves or the valve-seats and which Wouldinterfere with their operation.

In the drawings the pump hereinafter described is shown as used in connection` with a vacuum-cleaning device, as it is -particularly adapted for such use.- In this connection the casin 13 is provided with a dustbag 46' to which dust-laden air is supplied through an inlet 47. The air is drawn through the vdust-bag into the casing and thence through the pump in the manner above described. It will be understood that the invention is n ot limited to employment in connectionI with a vacuum-cleaning de vvice, but that the novel pump may be employed in various connections and for pumping various fluids.

By the peculiar form and construction of the diaphragm and `the pivotal mounting of its rigid portion the mechanism of the pump issimplied, since a single rigid mechanical element or member, comprising both the rigid portion of the diaphragm and the lever by which it is actuated, constitutes the entire mechanism of the diaphragm, and in this manner also the friction of .the mechanism is greatly reduced, since sliding joints are entirelyleliminated. The flexible marginal portion of the diaphragm is made suiiiciently loose, as shown in Fig. 1, to permit a substantial movement of the diaand the construction as a Whole is such.V

eener? phragm to either side of its median position,

that the diaphragm .may move equal distances in opposite directions so as to operate eiectively as a double-acting pump. t will be obvious, however, that the same diaphragm may be employed as an element of a single-acting pump where sach an arrangement may be preferable.

l claim l. A diaphragm-pump having, in combination, a casing, and a diaphragm comprising. a loose, iexible, marginal portion se cured at its edges to the casing, and a comparatively rigid middle portion pivoted upon the casing substantially in the piane of the diaphragm and free to oscillate to opposite sides of said plane.,

2. A diaphragm-pump having, in combination, a casing, a diaphragm comprising a loose exible, marginal portion secured at its edges to the casing, and a comparatively `rigid middle portion pivoted upon the casing sulostantiallv .in the plane of the diaphragm, and a iexihle dond-ti ht connection between the casing and the iaphragm adjacent to the pivotal support of the latter.

3. A diaphragm-pump having, in combination, a casing, and a diaphra located in the casin and dividing the atter into two Yplump-c iambers, the diaphra |1- oomprising a loose, iiexible, margine portion secured at its edges to the casing, and a comparatively. rigid middle portion pivoted adjacent to one Wall of the casing and substantially in the plane ofthe diaphragm, said e portion pivoted u on the casing 1 45 substantially in the plane oQthe diaphragm, and a second sheet of flexible lmaterial connecting said rigid portion with the casing adjacent to the pivot-al axis of the diaphi-agili.

5. A diaphragm-pump having, in comiiination, a diaphragm, a casing provided with two openings, and a valve controllinfr said Openings and comprising two'pivota members adapted to close the openings, respectively, and a single spring connected at its ends with said members respectively so as to have e ual action thereon.

6. A diap ragni-pump having, in come bination, a diaphragm, a casing provided with two openings, and a valve controlling said openin s, said valve comprisin plates provi ed with openings at their adgacent edges, studs upon Whlch said plates are pivotally mounte connected at its ends with said plates, respectively, and operating both to hold the valve in closed position and to maintain the plates inen gement with said studs.`

UTHER C. MCNEA'L.

Witnesses:

D. GURNEE, L.v THoN.

two

and a single spring,

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