US1977386A - Work hood - Google Patents

Description

Oct. 16, 1934. HQLES 1,977,386

WORK HOOD Filed Feb. 17, 1934 2 Sheets-Sheet l Armcwa's Oct. 16, 1934.

F. A. HOLES WORK HOOD 2 SheetsSheet 2 Filed Feb. 17, 1934 ATTOQA/EKS Patented Got. 16, 1934 UNITED sures WORK HOOD Floyd A. Holes, Cleveland, Ohio, assignor to Memorial Art Studio, Cleveland, Ohio, a copartnership Application February 17, 1934, Serial No. 711,778

8 Claims.

This invention relates to work hoods and particularly to work hoods for covering articles or work pieces while work operations are being performed thereon.

While the work hood embodying my invention may be applied to various uses, it is particularly applicable to cover work upon which sand blasting and like operations are performed.

It is an object of my invention to provide generally an improved work covering hood.

Another object is to provide an improved Work covering hood for covering work pieces upon which sand blasting or like dust-creating operations are performed.

Another object is to provide a work hood of the class referred to having an improved mode of operation.

Another object is to provide a work hood for covering work upon which sand blast and like operations are performed, having improved means for re-collecting the sand, shot or the like used in the operation.

Another object is to provide a work hood of the class referred to having improved means for removing dust resulting from the operation performed under the hood.

Another object is to provide a work hood of improved construction whereby the interior of the hood may be illuminated in an improved so manner.

Another object is to provide an improved hood of the class referred to adapted to be conveyed, in an improved manner, to the work upon which a work operation is to be performed.

Other objects will be apparent to those skilled in the art to which my invention appertains.

My invention is fully disclosed in the following description taken in connection with the accompanying drawings, in which:

Fig. 1 is a simplified perspective view illustrating an embodiment of my invention and illustrating a preferred mode of transportation and operation of the same, and its adaptability to be moved from place to place to work pieces to be operated upon.

Fig. 2 is a transverse sectional view of an embodiment of my invention illustrating the manner of using the same in connection with the performance of a sand blast operation upon a portion of a grave marker'or monument;

' Fig. 3 is a top plan view of the embodiment of Fig. 2;

Fig. 4 is a fragmentary front elevational view of the embodiment of Fig. 3 taken approximately from the plane 4 of that figure;

Fig. 5 is a fragmentary sectional view to an enlarged scale taken from the plane 5-5 of Fig. 3;

Fig. 6 is a fragmentary sectional view taken from the plane 6--6 of Fig. 4;

Fig. 7 is a view similar to Fig. 5 illustrating a modification;

Fig. 8 is a view generally similar to Fig. 1 but illustrating another mode of transportation and operation of an embodiment of my invention.

As will appear hereinafter, my invention is particularly useful in connection with the manufacture of grave markers, monuments and the like upon which flowers and other ornamentation are shaped or carved on stone by sand blast or like operation. Such monuments are customarily partly finished, awaiting sale thereof. Upon the sale of a monument it is finished by applying a selected design of ornamentation thereto. In shaping or carving ornamentation on the stone, it is common practice to transport it to a closed room in which the sand blast or like operation is performed. Floor space must thus be provided for the room and facilities must be provided and labor expended in transporting the monuments to and from the room.

By the employment of my invention, as will hereinafter become clear, a work hood within which the sand blast operation may be performed, is provided suspended from above and adapted to be lowered upon and around the work piece or monument for performance of the sand blast operation and withdrawn upwardly after the completion thereof. It is thus unnecessary to reserve floor space for a sand blast room. Furthermore, if desired, monuments awaiting sale may be set up for display in rows on the floor of the plant and may be finished by sand blasting the ornamentation thereon without movingthe monument.

Thus a saving of plant area. and a saving in time and labor may readily be eifected in the practice of my invention.

In Fig. 1 I have illustrated one arrangement of apparatus whereby my invention may be practiced. At is indicated generally a work hood comprising a relatively rigid top portion 1 and a flexible skirt 2 depending from and supported thereby. The top-portion 1 together with the depending skirt is detachably secured to a crane hook or the like 3 on the end of a cable 4 which passes upwardly over a pulley 6 and downwardly into engagement with a book 66. The hood 65 may thus be suspended over a monument or other work piece. 5 supported on a work table or banker 38 standing upon the floor for performance of a sand blast operation within the hood on the work piece in a manner to be described. After the operation, the hood 65 may be raised by the cable 4 and suspended in an out-of-the-way position. The cable 4 after passing over the pulley 6 may be provided with a plurality of links 67 engageable with the hook 66 to determine the suspended position of the hood 65.

The pulley 66 may be supported upon a carriage 7 running on wheels 8 upon a rail 68 whereby the hood may be transported from place to place along the floor to any one of a row of work pieces 55.

The top 1 in the particular embodiment illustrated comprises a rectangular frame 9 preferably composed of angle iron having a vertical flange 10 and a horizontal flange 11. A plurality of sash elements 12-12, preferably of metal, incline inwardly upwardly from the frame 9 and are 'secured thereto at their lower ends and at their upper ends are secured to a head element 13 preferably formed from sheet metal. Window panes orinserts 14 preferably composed of celluloid, glass or like transparent material, are supported upon the frame 9, head 13 and sash elements 1212 and thus completely close the space between the frame 9 and the head 13.

The panes maybe covered on their inner faces with metal screen if desired for a purpose to be described. A joint construction between edges of the panes is and the frame 9, sash elements 12 and head 13, may be provided whereby the same may be air-tight or dust-proof. As will be apparent, by this construction the panes 14 will be disposed at an angle to the horizontal fora purpose to be described, although this is not an essential feature of my invention. The said joint construction may provide for the convenient removal and renewal of the window panes in a manher well known and not necessary .to be further described herein.

Secured to the upper side of the sheet metal head 13 is a plurality such as four links 15-15 secured at one end to spaced portions of the head 13, upwardly inclining therefrom and secured together at a converging point 16 and joined to an eye 17 adapted to receive the above mentioned crane hook 3. Preferably the head 13 is rectangular, of the same general proportions as the rectangular frame 9 and thus the windows 14 in the top' as a whole are generally of the same width in their inclined directions.

A central, preferably rectangular perforation 18 is provided substantially at the center of the rectangular head 13 and theperforation is covered by a small hood 19 of sheet metal secured to the head 13 at the periphery of the perforation. An exhaust pipe 20 communicates with the interior of the hood 19 and is sealedly connected thereto and preferably of the known commercial type comprising a hose of rubber or the like with an inner helical wire to prevent collapsing under vacuum and may have. a generally helical wound external armor to protect the same and at the same time allow for free bending thereof.

Secured to the under side: of the head 13 is a pair of longitudinally spaced depending flexiible conduit arms 22-22 carrying at their lower ends electric lamps 2323 and. reflectors 24-24 therefor. A two-wire electric cord 25 is carried through a perforation 26 in the. .head 13 lined by an insulating bushing 27 and inwardly of the head 13 is connectedv to wires not shown' in the conduit arms 2222 leading to the lamps 2323 in a well known manner.

Switches 28-28 of well known construction are provided for the lamps 23 whereby they may be individually connected to or disconnected from the source of current to turn the lamps 23 on and oif. The reflectors 24 are preferably of generally parabolic form and have covers 2929 therefor secured to the periphery of the reflector by metal clips 30-30. The covers 29 are preferably formed from metal screen to protect the lamps 23--23 from abrasive action of the sand blast or the like to be described and may be removed by operation of the clips 30-30 to renew the same when they have become worn by abrasive action incidental to the performance of sand blast operations.

The conduit arms 22-22 may be of the flexible armored conduit type whereby the lamps 23-23 may be maintained in any desired position to which they are manually moved, to reflect the light thereof upon work within the hood as may be desired.

A rail 31 is supported by a plurality of hangers 32 upon the frame 9 directly under the same. A plurality of wire hangers 33-33 slidably movable on the rail 31 engage a plurality of eyelets 3434 in the upper edge of the curtain or skirt 2 to support the'same on the rail 31, and a flap 35 is secured to the skirt 2, extends upwardly therefrom, and has in its upper edge a steel spring or an elastic cord or the like 36 whereby the upper edge of the flap 35 may be resiliently drawn inwardly to engage the vertical flange 10 of the angle iron frame 9 to seal the skirt thereupon. By this construction the skirt 2 may be suspended from the head 1, although sealed thereupon, and may conveniently be removed when desired, and to this end and for purposes which will become apparent, the skirt is preferably made from flexible material such as fabric.

The skirt 2 terminates at a distance of several feet below the frame 9' and has a draw string 37 running in a hem at the lower end thereof. If preferred a spring or elastic cord maybe used in stead of the drawing string.

In the operation of the hood thus far described, it is first transported, for example on the rail 68 Fig. 1, to a work piece such as a monument '5 supported upon an individual work table or bankor 38 and lowered thereover. The draw string or cord 37 is expanded around and upon and allowed to resiliently engage and grip an upper portion of the banker 38 to seal the skirt thereupon as shown in Fig. 2. The hood is then lowered still farther and lateral portions thereof form an annular pocket 39 around the table 38 below the monument 5. To more effectually close the lower end of the skirt, it may constrictingly embrace the banker 38 under an overhanging shelf 69 thereon.

The skirt in lateral portions thereof below the top 1 is provided with a plurality such as two'or four sleeves iii-40 formed from fabric or like flexible material, sealed at one end to the periphery of suitable openings in the skirt and normally depending therefrom inwardly as shown in Fig. 6, and may have an elastic cord 41 at the end to normally close and seal the same.

In operation, an operator indicated in broken lines at 42, Fig. 2, takes in his hand a'sand blast tool 43 connected by a hose 44 to a source of com.- pressed air-blown abrasive sand, shot, or thelike, and projects his two arms through two adjacent sleeves 40 into the. interior ofthe skirt 2 The top 1 is suitably lowered until the windows 14 are at such a height that the operator may place his face close to the exterior thereof and view the interior of the hood. The operator can then-turn on one or the other of the lamps 23-23 to illuminatehis work. He may then carve or shape an ornament on the monument in relief by means of the sand blast 46.

By looking through the windows 14, the operator may accurately guide and control the work. The fit of his arms in the sleeves 40 prevents dust from escaping from the hood and as above stated all other parts of the hood 'are substantially sealed. As the work progresses he may move the lamps 23 by their flexible arms 22 as desired. During progress of the work, sand, shot or the like used in the operation may collect in the annular loop 39 as at 47. By providing a suitable number of sleeves 4e-40, the operator may move from one pair of sleeves to another to reach dilferent parts of the work conveniently.

To accurately predetermine the design or ornamentation, a suitable stencil may be employed but inasmuch as stencils for this purpose are well known in this art and constitute no essential part of the present invention, they need not be described herein.

During the operation, suction on the exhaust pipe may be applied to withdraw light dust from the hood so that the work may at all times be generally clear andclean and so that dust between the windows 14 and the work 5 will not obscure the design being developed on the work. Sufficient air may enter through the sleeves -40 and around the work table 38 through the space between it and the elastic cord or draw string 37, to supply a flow of air toward the exhaust pipe 20. It will be observed that the sleeves 40 are near enough to the windows 14 so that the operator may reach up and wipe off the window at any timehe finds it desirable to remove dust settled thereon.

After the operation is complete, the material at 4.7 will largely consist of blasting-sand, shot, or the like and this may be recovered by raising the annular loop 39 to'cause the sand and shot to flow around to one side such as the rear side of the skirt where a depending sleeve or spout 48 may be provided normally closed and sealed at its lower end by a draw string 49. Upon opening the sleeve 48 by removing the draw string 49, the sand, shot, or the like may flow into a receptacle such as a bucket placed thereunder.

To remove the hood it is only necessary to elevate the crane hook 3 in the manner described and to release the drawing string or elastic cord 3'7 from the banker 38.

If desired, and as will be apparent, in the case of a larger monument, which may stand upon the floor, the sealing string or cord 37 may be constrictingly drawn directly around the monument to seal the hood at that point.

Any suitable source of suction or exhaust may be provided to which the exhaust pipe 20 may be connected and any suitable source of electric current may be provided for the lamps 23--23. One suitable arrangement is illustrated in Fig. l. A main exhaust duct '70 is supported in a generally horizontal position upon the wall of a building a suitable distance from the floor; one end thereof as at '71 may be closed and the other end may be connected to a suitable air exhaust pump. A plurality of branch ducts '72-72 communicate with the duct '70 and are normally closed by removable plugs 73-73. The branch ducts '72 are spaced along the duct '70 opposite bankers 3838 upon which monuments or other work pieces 55 may be placed ready to have ornamentation shaped thereon. An electric conduit '74 may be secured upon the wall underthe duct and have outlets '7575 disposed preferably adjacent the branch ducts 72- 72. Therail 68. may be disposed so that the hood- 65 suspended therefrom will hang at a suitable distance from the wall.

With this arrangement as will be apparent from Fig. 1, when the'hood 65 is lowered over a work piece or monument 5 and banker 38, and is suspended by the hook 66, the end of the exhaust pipe 20, which may have a suitable coupling '76 thereon is joined or plugged into the adjacent branch duct '72 after removing the plugs '73 and thereby exhaust suction maybeapplied to the interior of the hood. correspondingly, the double cord 25, which may have on the end thereof a suitable prong connector, may be plugged into an adjacent outlet 75 to supply current to the lamps 23- 23.

The exhaust pipe 20 and wire 25 may be of suitable length so that it may not be necessary to disconnect them from the duct '72 andioutlet '75 when the hood is raised from its work position; but if the hood is to be moved farther along on the floor, they may be disconnected from one point of the duct '70 and conduit '74 and connected to another in a manner that will now be clear.

Where the apparatus is disposed adjacent a wall as shown in Fig. l, the hooks 66-66 may be secured to the wall.

In Fig. 8 I have illustrated another arrangement of apparatus by which my invention may be practiced.- In this form a crane of the bridge'type running on rails 8181 has the cable 4 for supporting the hood 65 depending from a bridge-carriage 82. The exhaust pipe 20 and wire 25 may be looped over a suitable support on the bridge 80 and thence may go to permanent con nections with respectively an exhaustduct and source of current. The hood 65 may be lowered upon any spot on the floor to enclose bankers 38 and work pieces or monuments 5 thereon.

In Fig. '7 is illustrated a modified form of connection between the upper end of the skirt 60 and the frame 61. In this case the skirt is carried up beyond the vertical flange 62 of the angle iron frame and downwardly inside thereof. Bolts 63 may be projected through the portions of the skirt thus disposed on opposite sides of the flange 62 and through the flange 62 itself to clamp the upper end of the skirt securely to the flange.

It will be apparent that other operations than sand blasting may be performed in the work hood of my invention, for example welding, and other operations wherein either the operator must be protected or the by-products of the operation must be confined and not allowed to escape into the room in which the work is done. Where welding is performed, the windows 14 may be of colored glass to absorb harmful rays of light and the skirt 2 may be formed from asbestos or other fireproof fabric.

It will therefore be apparent that changes and modifications in the above described embodiment of my invention may be made without departing from. the spirit thereof and without sacrihaving attaching means associated therewith for' attachment to a hoist apparatus whereby the hood may be lowered over and around a work piece, .and the cup skirt having constricting means associated therewith and operableto constrictinglyengage a lower portionof the skirt with a work piece support or the like. T

2. A work hood generallyofinverted cup form having attachi g means associated therewith for attachment, to a hoist apparatus whereby the hood maybe lowered over and around a work piece-and suspended from above, and the skirt being provided with constricting means at a lower portion thereof operable toconstrictingly embrace. 21, work piece support or ,thelike.

3. A work hood generally of invertedcup form having attaching means associated therewith for attachmentto a hoist apparatus whereby the, hood may belowered overgandaround, awork piece, the .cupform hood having an aperture through whicha workers-arm maybeprojected-into the hoodinterior todo .worktherein and a transparent window through which .he may viewthe work. a

. 4.. A-work hood generally of inverted. cup form having attaching means/associated therewith for attachment. to ahoistapparatus whereby the hood may be lowered over andaround a work piece and suspended from above,rthe cup .form hood; having .an aperture through which a workers arm may be projected into the hood inter-ior to do work therein. and a transparent wine dow through whichhe may View the work, and the skirt being providedwith constricting means at a lower portion thereof operable ,to' constrictingly embrace a work support or the like.

=5: A-work hood generally of inverted cup form having attaching means associated therewith for attachment to a hoist apparatus whereby-the hood may'be' lowered over and around a work piece' an exhaust conduit means adapted to be securedto the hood communicating with its 'in-. terior, and adapted tobe connected to a sub.- atmospheric pressure exhaust apparatus, and theskirt being. provided with constricting means at a-lower'portion thereof operable to constrictingly embracea work piece support or ,the like.

6. A work hoodcomprising a head'and a flexible skirt depending therefrom, 8;.WiildOW in the head disposedat an angle tothe vertical, through which work within the ,hood may be viewed, an aperture through the skirt through which a workers. arm may be projected into the hood interior to, do work therein, an exhaust conduit means adapted to be secured tothe head communicating with the hood. interior and adapted .to beconnected toa sub-atmosphericpressure exhaustv apparatus, and the skirt being provided with constricting means ata lower portion thereof operable to constrictingly embrace a work piece support or the like.

7. In a-work hood, a head, a flexible skirt depending therefrom, a lamp supported on the head interiorly of the hood and movable to adjustably position it, electric conductors connected to the lamp extending outwardly through the head and adapted to be connected to a source of current, an aperture in the skirt through which a workers arm. may be projected to do work within the hood, an exhaust conduit secured to the head communicating with the interior of the hood and externallythereof adapted to be connected to a source of sub-atmospheric pressure for exhausting the hood, a transparent window in the head through which a worker may iew work beingperformed by him within the hood, and attaching .means on the head by which it may be attached to a hoist apparatus whereby the hood may belowered over, and around a work piece and suspended from above.

8. In a work hood, a head, a flexible skirt depending therefrom, a lamp supported on the head interiorly of the hood an d movable to adjustably position it, electric conductors connected to the lamp extending outwardly through the head and adapted to be connected to a source of current, an aperture in the skirt through which a workers arm may be projected to do work within the hood, an exhaust conduit secured to the headcommunicating with the interior of the hoodand externally thereof adapted to be con} nected, to a source of sub-atmospheric pressure for exhausting the hood, a. transparent window in'the head through which a worker may view work being performed by him within the hood, attaching meanson the head by which it may be attachedto-a hoist apparatus whereby the hood may be lowered over andaround a work piece and suspended from above, and means a ss0. ciated with the skirt for'constrictingly engaging it with a work piece support or the like.

' FLOYD A. HOLES.

Images