US2241100A - Mechanical projecting apparatus - Google Patents

Description

y 1941- N. J. QUINN 2,241,100

MECHANICAL PROJECTING APPARATUS Filed Nov. 2. 1956 INVENT OR.

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Patented May 6, 1941 OFFICE MECHANICAL PROJEGTING APPARATUS Nelson J. Quinn, Toledo, Ohio; assignor of onehalf to Horace B. Fay, Shaker Heights, Ohio Application November 2, 1936, Serial No. 108,803

4 Claims.

mounted, as on a shaft, for high speed rotation.

The disc or head carries a plurality of spaced blades. Means are provided for feeding abrasive material to the heels of the blades during a predetermined arc of rotation thereof so that the blades receive the abrasive while rotating at com-' paratively low velocity, the rotating blades then serving to accelerate the abrasive and project the same from the outer ends thereof at abrading velocities.

An object of this invention is to reduce the percentage of abrasive destroyed in operation without doing useful work, and to so feed the abrasive to the blades that the abrasive projected by the blades from the outer ends thereof will be controlled as to direction.

My improved centrifugal machine may comprise a rotatably mounted disc supporting radially extending blades, or it may comprise a pair of rotatable discs coaxially mounted in spaced relationship, each disc supporting a set of radially extending blades on the facing sides thereof. Between the two sets of blades may be located means for feeding abrasive to the inner ends or heels of the blades. The feeding means may be adjusted or moved into various positions so that the abrasive material is projected thereby into the path of rotation of the blades at a predetermined point during rotation thereof, whereby directional control of the abrasive thrown by the rotating blades is achieved.

The abrasive feeding means in accordance with this invention extends from a point beyond the outer ends of the blades inwardly toward the shaft and substantially perpendicular to the shaft axis, and is operative to discharge the abrasive into the path of rotation of the blades adjacent the inner ends thereof. Power driven means may be provided for conveying and forcibly ejecting the abrasive into the path of rotation of the blades.

A more detailed description of my invention will follow in the specification which is to be interpreted by reference to the annexed drawing. The salient features of my invention will be set forth in the claims.

Referring now to the drawing:

, Fig. 1 is a transverse cross-sectional view of nal in the end of the tube 25.

ing in the direction of the arrows 2-2 of Fig. 1;

Fig. 3 shows a bladed rotor head equipped with a feed belt for feeding the abrasive into the path of rotation of the blades;

Fig. 4 shows a bladed rotor head and an abrasive feeding wheel provided with a hollow abrasive feeding rim operative'to feed abrasive material 'to the blades; and

Fig. 5 shows a bladed rotor head and abrasive feed 1 wheel associated therewith operative to throw theabrasive material into the path of rotation of the blades.

The projecting apparatus about to be-described is supported upon a suitable stationary base, not shown, which carries a horizontal shaft II] which may be rotated in any desired manner. A pair of spaced disks [5 are carried by the shaft and fixed thereto by end plates [1, each of which is rigidly fastened to the shaft and to its respective disk l5. These disks act as outside retaining walls to prevent an overflow of abrasive at the sides of the projection device and greatly increase the throwing efiiciency by causing all ejection to take place at the outer periphery of the blades.

A sleeve 18 is provided to space the disk members l5 and to provide a support for the abrasive feeding mean-s hereinafter described.

Projection blades are carried by the disks which direct the stream of abrasive outwardly to the surface to be cleaned. These blades may comprise trough-shaped members 20 which are brazed to angle flanges 22, which in turn are secured to the face of the respective disks l5 by suitable cap screws. A plurality of these blades are mounted about the face of each disk and cooperate with oppositely located blades carried by the other disk to provide the aforementioned projecting means. 4

The power feeding means heretofore mentioned may comprise, as shown in Figs. 1 and 2, a tube 25 carrying a feed screw 21, operable at various speeds depending on the amount of abrasive to be fed and which, at its lower end, tapers to form a bearing portion engaging an axially located jour- A pair of openings 28 are provided on opposite sides of the tube 25 for the discharge of abrasive fed thereto under the action of the screw 21.

, The end of the tube 25 terminates in an ear which is pivotally carried by the pin 32 between the ears of a clip 34, as shown in Fig. 2. The opposite end of the clip 34 surrounds the shaft sleeve I8, as shown in Fig. 1, and'is rotatably secured in position thereon by a second sleeve 35 secured to the aforementioned sleeve and the shaft [0 by a pin 31.

The tube 25 passes upwardly from the clip 34 between the cooperating blades 20 of respective disks l5 and at its top terminates in a feed funnel 40, through which the supply of abrasive is admitted to the tube. This upper end of the tube 25 is adjustably carried by the main frame of the machine in a manner to permit rocking of the lower end of the tube to locate the openings 28 at various points about the shaft I in order to effectively control the stream of abrasive dis charge from the machine. A belt feed may be provided, as shown in Fig. 4, in the nature of a modification of my preferred form to positively transfer a given amount .of abrasive to the heels of the projecting blades. As shown in that figure, one end of a hollow V-belt 45 passes around a pulley 41 located beyond the disks I and adjacent a feed funnel 50 which deposits abrasive on the belt 45. The opposite end of theb'elt 45passes around astraight "sleeve fixed to the shaft 19, serving also to space *the disks 1'5 and is positively rotated thereby.

As will be seen in Fig. 4, abrasive passing down the belt 45 is dischargedto the heels of the projecting blades 'at such a point as to result in "a downward blast of abrasive from the disks. The guide pulley 41 is adjustable vertically to vary the point of discharge at the inner end 'from"the belt'and thus control the direction of the 'streamof abrasive discharged from themachine.

A further 'modificationiis shown in Fig. '4, where a-feeding wheelfifl provided with arim SI of v-"shapedcross-section is positively rotated and discharges abrasivematerial onto" the heels of the blades "as there shown. Where two sets of abrasive throwing-wheels are co-axially mounted 4m thesame shaft l0, the'feeding wheel 60 is so 'positionedasto extend axially therebetween with the plane of rotation of the feeding 'wheelisub- 'stantially perpendicular to the axis ID of the spaced throwing wheels, each throwing wheel comprising a'disk HS having a plurality of radially extending blades 2|] mounted thereon.

Abrasive "is deposited in the rim at the top of the wheelbymeans'of 'an abrasive supply funnel 62, as shown in Fig. 4. The wheel 60 is rotated at anydesiredspeed, although necessarily much slower than the speed of the disks t5, and

this speed may be varied to deposit abrasive at the bladesfin greater or lesser amounts as desired. Further, the wheel-B0 may be shifted to acert-a-in extent around the axis of the shaft [0 to vary the point of discharge of the abrasive materialand in this way control the directionof the sand blast leaving the machine.

An additional modification of ,my feeding means is' shown in Fig. 5, where a small wheel This provided carrying avplurality of deep pocketsin'towhich abrasive is dumped bya suitable funnel '75. The wheel 7!! is rotated at a "rapid rate and projects the abrasive into the path of 'the large blades 38 ofthe disks l5,from whence itis thrown at the required speed onto the work to be cleaned. The "small-wheel 19 may be "frictionally driven from the-disks l5, orif desired may be rotatedby a small motor of suitable construction or driven in any other desired manner. "The wheel l0 may be shiftedaboutthe periphery of the disks'il-5 to varythe point-at which abrasive thro-wn'therefrom is picked up by-the blades .3flland toico'ntrolzinithis manner'the direction of discharge of :the .abrading material from the machine.

From the foregoing specification it will 'beJseen that I have provided a positive means for feed- Furthermore, adjustment of the feeding means renders it possible to control the direction of the stream of abrasive as the same leaves the machine. The amount of power required to drive theapparatus is of course decreased because of the closed system set up due to the use of the side-wall retaining disks, as distinguished over the old; type of paddle wheel which set up a very strong fanning action.

Other modes of "applying the principle of my "invention may be employed instead of the one explained, change being made as regards the "mechanism herein'disclosed, provided the means stated by any of the following claims or the "equivalent of 'suchstated means be employed.

I therefore particularly point out and distinctly claim as my invention:

1. In a machine for projecting'abrasive, the

combination of 'a rotatable shaft, '2. support carried by said-shaft, a plurality of blades carried by said support, and a power operated feeding beltforconveying-abrasive material from beyond the blades inwardly toward said shaft and substantially perpendicular to the shaft axis and discharging the abrasive material into'the path of rotation of the inner ends of theblade's, said belt being adjustable to control the direction of port spaced from the'blades on the other support, 'andpower operated feed belt extending between said supports and said blades generally perpen- 'dicular to said shaft for positively feeding and discharging abrasive into the path of rotation of the inner ends of said blades as they arrive at a-predeterminedpoint during rotationthereof.

3. In a centrifugal abrasive projecting machine, a 'rotatably mounted shaft, a disk shaped support fixed to rotate with said shaft, spaced abrasive propelling blades carried by said support and projecting laterally from one facethereof, apower-operated feed belt extending from a point exterior .to said support to a point adjacent :the ipathj'of rotation of said blades for positively feeding abrasiveinto the path of rotation of the innerendsof said blades as they arrive at a predetermined point during rotation.

.4. In a centrifugal abrasive projecting machine, a 'rotatably mounted shaft, a disk shaped support fixed to rotate with said shaft, spaced abrasive propelling bladescarried by said support and projecting laterally from one face there- 'of, a power-operated feed belt extending from a point exteriorto said support to .apoint adjacent "the path of rotation of said blades forpositively feeding abrasive into the path of rotationio'f the inner ends of said blades as they arrive at a predetermined point during rotation, the inner endlof said belt being trained'around and sup- :ported bysaid shaft.

NELSON -J. QUINN.

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