US1844416A - Pump for spraying apparatus - Google Patents

Description

Feb. 9, 1932.

R. L. BACHER ET AL PUMP FOR SPRAYING APPARATUS Filed Jan. 29, 1929 Patented Feb. 9, 1932 UNITED STATES PATENT OFFICE ROLLIN L. BACI-IER AND WALTER R. BAUMANOF LAKEWOOD, OHIO, ASSIG-NORS 'lO THE UNITED STATES AIR COMPRESSOR COMPANY, OF CLEVELAND, OHIO, A CORIO- RATION OF OHIO PUMP FOB. SPRAYING APPARATUS Application led January 29, 1929. Serial No. 335,941.

This invention relates to spraying` apparatus and particularly to a portable power operated device which is suitable for spraying paint, varnish and the like. It is well known that the spraying of relatively heavy liquids requires a substantially high pressure of air, and that such pressure is supplied by large power driven compressors. For spraying.;` use in homes and other places however, which are not equipped with air under relatively high pressure, the application of sp aymg apparatus has been limited to small work for which a. hand spray produces satisfactory results.

In developing a relatively small power spray unit such as one wherein the power apparatus is portable, we have found that a motor driven compressor unit in order to be suliiciently light in weight must operate at a spoed approximately 2,()O0-revolutions per minute. 1We have also found that in developing a compressor unit having these characteristics, that the unit has a tendency to vibrate and move across the floor upon which it is located. were made to avoid such action by using pistons and other internal parts of relatively light material and by balancing the rotative parts, but notwithstanding the iinest degree of balance, the unit continued to creep across the floor.

The principal object of the present invention therefore, is the production of a power operated compressor, which is suiliciently ligl'lt in weight that it may be readily carried by one hand, and easily transported from place to place, and yet will possess sufficient power to permit relatively heavy liquids to be used in the spray gun. A further objec-t of our invention is to make a power compressor unit, which may be operated at a high rate of speed and which, when so operated, will not creep across the floor.

We accomplish the above objects by mountingr a single cylinder air compressor and a Experimental effort-s directly connected electric motor upona common portable base. The air supplied from the compressor is passed through a moisture separator, and is then conducted through iler;-Y

ible hose to an atomizer of conventional design, The compressor operates at relatively high speed so as to produce the .necessary power from a relatively small compressor. To prevent creeping of the power unit durino' operation7 we mount a flywheel on each side of the compressori'. Since the cranlr shaft constitutes an extension of the armature shaft of the motor, the lywheels7 compressor and motor all operate at the same rate of speed.

Referring now to the drawings, Fig. 1 is a side elevation, partly in section, of a power' spray apparatus made in accordance with our invention and Fig. 2 is a vertical section taken through the apparatus on a plane indicated by the line 2--2 in Fig. 1.

ln the preferred fornu'the apparatus embodying our invention comprises an electric motor 10, and a direct connected air compresser l1, which are mounted upon a common base 12. A flexible coupling 13 provides a connection between the armature shaft 14 of the motor and the crank shaft 15 of the compressor. The compressor shown is a single cylinder unit having a cylinder head 16 which carries an inta-ke valve 17, and an outlet valve 18.

The valve openings are disposed directly` beyond the crank case. "A flywheel 22 may then be mounted on the crank shaft extension While another flywheel 23 is mounted on that part of the shaft, which is disposed between the coupling and the crank case. We have found that flywheels arranged in this man-` ner enable the compressor to be operated at 28. Av thumb operated valve is shown adjav cent the handle 0f the spray gun for con trolling the air flow through the apparatus in the usual way. The moisture separator Vis shown as a hollow casing which is supported by legs 30, and which is fastened by suitable securing members to the base l2. The separator straddles the coupling and provides a suitable protecting device therefor. A baffle 31 extends across the separator chamber and .v

defiects air entering the separator from conduit 25 and since the outlet of the separator is disposed on that sideV of the baffle opposite the inlet, the moisture will'have a tendency to collecton the bottom of the separator, from whence it may be drained through a valve 35.

To make the power unit portable, we provide a handle l0 which may be attached to the unit adjacent the mid portion thereof. The separator being disposed between the motor and compressor makes a suitable place for attaching the handle. By making the vertical portion 41 of the handle hollow, a passageway is provided for the attachment of" a safety valve 42. Y.

lnk view of the foregoing description, it will be obvious Vthat we have provided a power spraying unit which is sufficiently light in weight to be portable, and yet which possesses sufcient power to atomize Vrelatively heavy liquids. This device provides therefore a relatively inexpensive unit which greatly extends the field of usefulness for spraying apparatus.

We'cla-im: s y

A motor compressor `unit comprising 'in combination, a portable base, an electric mo# tor and an air'compressor mounted thereon, said motor having an armature shaft and the air compressor having a crank shaft, said shafts being substantially in alignment with each other, a iexible coupling providing an operative connection between the shafts,the crank shaft being extended outside the compressor, a flywheel mounted on the crank shaft on each'side of the compressor, a mois' ture separator also mounted on the base, and havingv vertically extending portions in close' proximity to the coupling and providing aV shield' therefor, and having a moisture cham ber above the coupling,.af baffle within the chamber, said'chamber having an inlet disposed on one side -of the baffle and anoutlet disposed on the'other side of the baiie, means connecting the inlet to the compressor and a flexible discharge conduit connected to the outlet, and the upper end of the moisture separator terminating in a handle, said handle signatures.

i -WALTER R. BAUMAN.

ROLLIN L. BACHER.

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