US1739484A - Shaper hood - Google Patents

Description

Patentedv Dec. 10, 1929 UNITED Asif'rArEs PATENT OFFICE nGHRALDTY HURLBUBT, or DETROIT, MICHIGAN, ASSIGNCR To THE ALLINGToN a CURTIS MANUFACTURING COMPANY, or SAGINAW, MICHIGAN, A CORPORATION or MICHIGAN y SHAI'IIH Hoon vApplication ineav september 19, 1927. serial No. 220,453.

10i therefore, is the provision of a shaper hood having a discharge opening for continuously getting rid of the heavier pieces by dropping them outlof the hood by gravity upon the floor or into a suitable receptacle for periodical removal.

`Afurther important object of the inven tion isfthe provision of an adjustable. baiie plate to vcontrol thesuction and therefore the Y upward tendency of the heavier particlesl so that too much of this material will not be in suspension in the vertical suction pipe for too long a time. j g y Other important objects will appear hereinafter, .the drawings illustrating a preferred embodiment ofthe invention.-

In the drawings- Figure 1 is an elevation of a Shaper hood constructed in accordance With the principles of this invention and located adjacent a rotating lshaper head; and Y Figure 2 is a plan view of the hood illustrating a Shaper head for making a side cut upon a piece of timber.l

In wood working factories equipped with exhaust fans and dust collecting systems of pipes, it is customary to employ such machines as Shapers with rapidly rotating cut ter heads for making side cuts on pieces of lumber and heretofore great difficulty has been experienced with hoods attached to the suction pipes for these machines on account of large pieces, splinters, knots, etc., from the lumber, in addition to the normal and liner shavings ordinarily made by the cutter head. The'heavy pieces thrown by the knives into the hood are too heavy to be taken up by suction through the vertical suction pipe and consequently these parts accumulate in the back of the hood and gradually clog it up.

The' present invention proposes to overcome this objection by providing a discharge opening below the vertical section of the hood from which the larger pieces may be discharged by gravity. In accomplishing this result it is found desirable to provide avariable baffle plate which may be adjusted to control the suction, depending upon the size of -the machines and the character of the cutting which is being done. i

Referring more particularly to the drawings, the suction hood is located adjacent a cutter head 4 mounted upon a vertical spindlel 5in bearings 6 and rotated in any well known manner by a belt 7 and pulley 8. This cutter may be provided with adjustable blades 9 adapted to make a side cut, for example, upon, apiece of'lumber 10 which is moved progressively into cutting position.

The hood is ordinarily supported adjustaj bly on a machine table adjacent the cutter head and is made of sheet metal'with a somewhat irregular 'flaring receiverll having sides 12 and 13, varying in length, and top and bottoml pieces 14 conforming thereto to provide an opening 15 which is inclined to the direction of feed of the lumber 10, the longer side 13 being disposed inthe direction from which the lumber 10 is fed so that the particles which fly from the cutter head will be engaged f thereby. The upper edge of the opening may be provided with a lip 16 for strengthening and protecting this portion of the hood and the'interior surfaces of the receiver are provided with removable liners 17 which may be replaced as they become worn.

At the reduced end ofthe receiver 11 is a hood section -18 substantially rectangular in cross section-tov conform to the receiver 11 and having a suction head 19 at the top reduced to a "circular extremity for receiving a suction pipe 20. At the bottoml of the section 18 is an upwardly inclined shoulder 21 beyond which is an opening 22 below the suction head 19 or at the bottom ofvan inclined rear wall 23 which leads directly' to the opening 22. p

In the hood section 18 is a baffle plate 24 disposed directly above the inclined shoulder 21', which is movable at an langle into the secf tion 18jto restrict or enlarge .the opening betweenthe 'shoulder 21V and thebalile plate,

thereby varying the suction for the receiving end ot the hood. This battle plate may be adjusted by bending it within the hood or it may even extend through a suitable slit at the upper edge of the section 18 and be variable from the outside of the hood.

ln operation the velocity ot the material thrown oii' by the cutter head will throwl the material vell up into the hood, and the suction will draw the lighter particles up through the suction pipe 2O in a well known manner. The baille plate 24 is adjusted to control the suction for heavier particles so that they will not be held insuspension inthe vertical portion of the hood but will drop by gravity through the opening 22 or against the inclined wall 23 and thence through the opening 22. The actual sizes and dimensions ot' these hoods depend upon the size oit the machines tor which they are used and the character oit' the work to be done, but it is found that hoods of this kind will save fully one half of the power otherwise required for keeping ordinary hoods and pipes clear.

lt is obvious that various changes may be made in the construction, combination and arrangement o'tthe parts without departing from the spirit and scope et this invention.

I claim:

l, En a suction hood for dust collecting systems, a converging reception portion opened at the end, a vertical suction discharge, a housing connecting the discharge and the reception portion comprising an opening below the suction discharge, and an inclined wall extending below the discharge and leading` to the edge of the opening.

A suction hood for wood working inachines having a flaring opening disposed adjacent the machine, a vertical suction pipe connection and a connecting portion between the suction pipe connection and the haring opening, a baille plate adjustable in the connecting portion to vary the suction as desired.

A suction hood for dust collecting, having a receiving opening at one end, a vertical suction pipe' at the other end, an opening in the hood below the suction pipe opening, and an adjustable battle plate in the hood above the said opening for varying the suction depending upon the character of materia-'l to be collected.

fl. A suction hood for dust 'collecting systems, havingl a receiving opening at one end, a. vertical suction pipe opening at the other end, an inclined wall below the suction pipe opening", a bottom opening at the lower end ot the inclined wall, and a bathe plate within the hood above the said bottoni opening to control the suction at the receiving end of the hood.

5. A collecting hood for saw dust or the like, having a receiving opening at` one end, a suction opening at the other end, an inclined wall below the suction opening, a-

shoulder in the bottom ot the hood at a disu tance from the lower end of theinclined wall, a discharge opening between the shoulder and the lower end of the inclined wall, and a battle plate in the hood above the said shoulder for controlling the suction at the receiving opening.

6. A suction hood for collecting saw dust and the like, comprising a rectangular open end portion and an opposite circular suction pipe outlet and an intermediate connecting portion; the connecting portion having an inclined wall below the suction opening with a discharge outlet atV the bottoni thereo't, and a raised projection in the bottom wall at the other side ot the opening; and a movable batiie plate in the connecting portion of the hood above the bottom projection and the discharge opening -for controlling the suction at the open end.

7. In a suction hood for dust collecting systems, a suction pipe connection, an inclined wall below the pipe connection7 and a d barge opening at the bottom ot the inclined wall so that large heavy pieces drawn into the hood may be discharged by gravity therefrom, means torining a variable suction control above the discharge opening in the hood, and a rectangular flaring receiving portion having opposite sides one longer than the other, a strengthening` lip overhanging the opening` thereot', and metal liners for protecting the insides oli the receiving portion.

8. A. suction hood' for collecting saw dust having an open end forming a receiver, a suction outlet at the top' ot the opposite end, and a discharge opening in the bottoni, and a baiile plate bendable in the hood for varying the suction therein.

GERALD TY HURLBURT.

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