US1170198A

US1170198A - Sand-blast device.

Info

Publication number: US1170198A
Application number: US79573913A
Authority: US
Inventors: John E Sweet; Anthony Winter; Frank G Chambers
Original assignee: STRAIGHT LINE ENGINE Co
Current assignee: STRAIGHT LINE ENGINE Co
Priority date: 1913-10-17
Filing date: 1913-10-17
Publication date: 1916-02-01
Anticipated expiration: 1933-02-01

Description

- J. E. SWEET, A. WINTER & F. G. CHAMBERS. SAND BLAST DEVICE.

APPLICATION FI'LED OCT. 17, 1913.

l, 170, 1 98. Patented Feb. 1, 1916.

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JOHN E. SWEET, ANTHONY WINTER, AND FRANK Gr. CHAMBERS, OF SYRACUSE, NEW YORK, ASSIGNORS TO STRAIGHT LINE ENGINE COMPANY, A CORPORATION OF NEW YORK.

SAND-BLAST DEVICE.-

Specification of Letters Patent.

. Patented reb. 1, 1916.

Application filed October 17, 1913. Serial No. 795,739. 4

To all whom it may concern:

Be it known that we, JOHN E. SWEET, AN- THONY WINTER, and FRANK G; CHAMBERS, of Syracuse, in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Sand-Blast Devices, of which the following, taken in ery head to such an extent as to require frequent repairs and in most of the devices now in use necessitate frequent replacement of the entire delivery head.

The main object of our invention is to render the operation more eflicient and less expensive by reducing the liability of congestion of the sand in the sand condult and by making the parts of the delivery head, which are subjected to the most severe wear by abrasion, removable so that they may be replaced by new ones without destroylng or displacing the other parts.

Another object is to establish slip connections beween such removable parts and main body of the delivery head so that they may be easily and quickly removed and replaced.

Other objects and uses will be brought out in the following description.

In the drawings Figure 1 is a side elevation of a sand-blast device embodying the various features of our invention. Fig. 2 is an enlarged longitudinal sectional view of the delivery head showing the air-controlling valve in elevation. Fig. 3 is an end View of the delivery head omitting the aircontrolling valve. Fig. 4 is an enlarged lengthwise sectional view of the sand-receiving head. Fig. 5 is an end view of the head shown in Fig. 4.

As'previously explained, this device is preferably portable and for this purpose comprises a flexible hose 1 having its opposite ends provided with a sand-receivsuitable clamp 6'-.

ing head 2 and a delivery head 3-, the flexibility of the hose permitting either head to be adjusted to any angle or direction according to the position of the sand supply or reservoir and object operated.

upon.

The sand-receiving head 2 preferably consists of a bulbous tube having its receivng end tapered for convenience of insertion into the body of loose sand and its opposite end reduced for the reception of the adacent end of the hose which may be se cured thereto with a tight-slip fit or clamped wlth any well known forms of hose and clamps if necessary.

The intermediate portion of the head is enlarged to form a relatively large chamber -4.-'for the purpose of reducing the liability of congestion or clogging of the sand after entering the receiving head. We have found, however, that this congestion or clogging of the sand may be absolutely prevented by providing the chamber 4 with an air port or inlet 5 which is prefer- -ably connected to a relatively smallair inlet tube 6 running along one side of'the bility of the entrance of sand into the air duct by careless manipulation of the receiving head into the sand, the free end of the air tube being attached to the hose by a This hose and its receiving-head 4. may be termed a suction conduit through which the sand is drawn by a rapidly moving current of air passing across the delivery end of the hose in a manner hereinafter described, and the object in providing the air inlet 5, leading from the atmosphere into the interior of the chamber '4: is to prevent packing of the sand in the suction conduit by means of the current of air which is drawn by suction into said conduit through the air inlet to mix with the inflowing sand and cause such sand to pass loosely through the conduit, the same current of air serving to prevent eddying currents of sand at the junction of the receiving head with the hose.

The delivery head -3 is provided with separate passages 7 and '8 converging toward the deli' ery end of the head into a single outlet passage 9' for receiving respectively air under pressure an San air-discharge nozzle 11-.

both of which are simultaneously delivered into the outlet 9 at their point of mergence. The air passage -7 is preferably formed centrally in a transverse partition 10 coaxial with the axis of the head and is, therefore, of less diameter than that of the head at opposite ends of the partition for receiving the cylindrical portion of an This nozzle is considerably longer than the actual thickness of the partition 10 and extends beyond opposite endsthereof, the rear end of the nozzle being provided with an outturned annular shoulder 12 while the opposite or front end is preferably tapered so that the nozzle may be easily and quickly inserted into the passage 7 with a sliding fit and may be adjusted axially to bring its discharge end into proper position relatively to the sand passage 8 to produce a higher degree of suction in the sand pipe or hose. This adjustment may be effected by means of a series of relatively thin washers -13 surrounding the cylindrical portion of the nozzle 11 between the shoulder 12 and adjacent end face of the parti' tion 10, thus permitting the discharge end of the air nozzle to be brought to the desired position by simply adding or subtracting one or more washers, thenozzle being held in its operative position by means of a screw nipple 14: on the inner end of the valve case l5 which is screwed into the adjacent end of the head as shown more clearly in Fig. 2, the valve casing being provided with a suitable valve 16 for controlling theflow of air through the nozzle 11.

The delivery end of the head 3 is provided with an enlarged circular socket 17- disposed at an angle to the axis of the head in such manner that the inner end of the socket is coaxial with said head and with the air discharge nozzle 1l while the outer end is eccentric to said axis, thereby providing one side of the delivery end of the head with a bevel or inclined seat -18 for receiving and partly retaining the inner flaring end of a delivery nozzle -19 through which the air and sand are blown upon the surface of the object which is being treated.

The inner end of the nozzle 19 is additionally held in place against the inclined seat 18 by means of a set screw 20- which is engaged in a threaded aperture in j the opposite side of the head and adapted to engage the corresponding side of the nozzle 19 some distance from its inner end so that when the nozzle is thus clamped in place, it is firmly held against accidental endwise displacement, the inner endof the nozzle being adapted to abut against an annular shoulder 21 at the base of the socket 17 to hold said nozzle against inward displacement while the inclined shoulder l8- and clamping screw 20 serif-e to hold it against outward displacement.

It is now clear that when the discharge nozzle 19-- is secured in operative posi tion in the outer end of the head 3- it is coaxial with said head and also with the air discharge nozzle 11-, the passages through both nozzles being preferably tapered outwardly so as to project air and sand in the form of a jet with considerable force and, therefore, to a considerable distance from the end of the discharge nozzle 19. Both of these nozzles 11 and 19 are preferably made of hardened metal and capable of resisting to a maximum degree the tendency toward abrasion thereof by contact of the rapidly moving sand therewith and, in order that the durahility of this portion of the device may be further increased, the inner end of the discharge nozzle 19 is so relatively disposed as to bring one side usually the upper side thereof directly opposite the inner end of the sand passage 8 so as to receive the force of impact of the sand in its passage into the head.

We have found that the greatest degree of suction in the sand pipe is produced by carrying the forward end of the air nozzle nearly or wholly across the delivery end of the sand pipe at its point of discharge into the head 3 and it is owing to this fact that the air nozzle is preferably made of highly hardened metal so as to be capable of withstanding to a maximum degree the tendency toward abrasion by the inflowing sand.

The hose 1 is connected to the head 3 by a slip connection through the medium of a nipple 22 which is secured in operative position to the head by means of a set screw 23 as shown more clearly in Fig. 2, said nipple being also made of hardened metal to prevent excessive wear by abrasion.

The valve case 15 is provided with a tubular inlet stem 24 adapted to be connected by a flexible hose or other conduit to any available source of air supply capable of projecting the air with the desired pressure through the head 3 and thereby producing such a degree of suction in the sand pipe or hose 1 as may be necessary to draw the sand therethrough and forcibly eject the same from the nozzle -19 on to the object operated upon.

What we claim is:

1.- A sand blast device comprising a threaded air pipe nipple, a tubular head having one end threaded internally and screwed upon the nipple and its opposite end provided with a socket, the inner end of which is co-axial with the nipple and the outer end eccentric to said axis, a tapering 1 let' intermediate its ends at an angle to the i .nozzle in the socket co-axi-al with said axis,

said head having an inner annular shoulder intermediate its ends and a branch sand inlet opening therein between the annular flange and inner end of the nozzle, and an air nozzle fitted within the annular shoulder and having one end extending partially across. the branch inlet and its opposite end enlarged and clamped between the annular flangeand adjacent end of the nipple.

2. In a sand blast device, the combination of a tubular head having a branch sand inaxis thereof, said head having an air inlet in one end and its opposite end provided with a socket, the inner end of which is coaxial with the axis of the head and its outer end eccentric to said axis, a tapering delivery nozzle for sand and air having its larger end of substantially the same diameter as the inner end of the socket and fitted therein, and movable means for holding said nozzle in the socket co-axial with the head. I

3. In a sand blast device, the combination of a tubular head having an air inlet in one end and a cylindrical socket in its opposite end disposed at an angle to the produced axis of the inlet, said head having a branch sand inlet intermediate its ends at an acute angle with the axis of the air inlet, a tapering delivery nozzle for sand and air having its larger end of substantially the same diameter as the socket and seated in the base thereof co-axial with the air inlet, and movable means in one. side of the socket for clamping the nozzle against the opposite side of said socket.

4:. In a sand blast device, the combination of a tubular head having an air inlet in one end and a cylindrical socket in its opposite end disposed at an angle to the produced axis of the inlet, said head having a branch sand inlet intermediate its ends at an acute angle with the axis of the air inlet, a tapering delivery nozzle for sand and air having its largerend of substantially the same diameter as'the socket and seated in the base thereof co-axial with the air inlet, movable means in one side of the socket for clamping the nozzle ,againstthe opposite side of said socket, and a valve having one end of its case provided with a threaded nipple screwing into the air inlet end of the head.

5. In a sand blast device, the combination of a tubular head having a branch sand inlet in one side intermediate its ends, an air pipe nipple in one end of the head, a transverse partition within the head between the branch sand passage and inlet nipple and provided with a central. openlng co-axial with the air inlet nipple, and a tapering air nozzle fitted in the opening in the partition and having its larger end clamped between said partition and nipple.

In'witness whereof we have hereunto set ourhands this 10th day of October, 1913.

J QHN E. SWEET, ANTHONY WINTER, FRANK G. CHAMBERS.

Witnesses: I

W. T. FROMAS, W. T. Pownns.