US1818055A - Screw conveyer - Google Patents

Description

Aug. 11, '1931. T. ELLIOT T 1,818,055

SCREW CONVEYER Filed May 9, 1930 INVENTOR Thomas Elliott I B'Y VV/TNESS ATTORN EYS 'ing.

Patented Aug. 11, 1931 tulle FFECE THOIIIASEIJLIOTT, BIRMINGHAM, ALABAMA, ASSIGNOE 'IO CONTINENTAL GIN COM- PANY, A. CORPORATION OF DELAVTAR-E SCREW GONVEYER Application filed May 8,

My invention relates to screw conveyers, iore particularly to screw conveyers having side discharge opening, and has for its object the provision of an improved overflow means operable upon the congestion of material at the discharge opening to relieve the conveyer of any excess material.-

A further object of my invention is to provide in a vertical screw conveyer an improved discharge element operable under normal conditions to eject material elevated by the conveyer througl'i the side discharge opening and which shall automatically operate under abnormal conditions to eject excess material through the overflow discharge.

A more specific object of my invention is to provide a rotary discharge element on the upper end of a vertical screw conveyer shaft which shall be releasably engaged by the shaft, and which shall be adapted to be raised by an excess of material being elevated to its overflow position in which it again engages the shaft and operates to discharge material through the overflow open- Briefiy, my invention comprises a screw conveyer having a casing with a side discharge and a bladed discharge element mounted on the conveyershaft and adapted to function as a valve and to eject material outwardly through the side opening. The bladed discharge element is adapted to be moved by an excess of material longitudinally on the shaft to a position in front of an overflow opening in the casing arranged beyond the side discharge opening. Clutch means are provided which cooperate with the discharge element to rotate it in either position. When in its normal position, the discharge element acts to close oif and prevent the discharge of material through the overflow opening.

The single figure of the drawing, forming a part of this application, shows in vertical cross section, a screw conveyer embodying my invention.

Referring to the drawing for a better und standing of my invention, I show a screw conveyer embodying a rotary helical flight 10 and a conveyer shaft 11. Sun

1930. Serial N0. 451,128.

rounding the conveyer is a casing 12 hav- 2 ing a side discharge opening 13. Disposed above the side discharge opening 13 is an overflow opening 14 for carrying away excess material.

Loosely mounted upon the conveyer shaft i is a rotary discharge element 16 having a hub with portions 17 and 18, respectively, extending above and below the discharge element. The dischar e element 16 preferably provided with blades 19, which, in rotation, throw the material radially out ward through the discharge opening 13. The upper end of the discharge element is provided with a plate 20 which serves to prevent the longitudinal passage of material thereby when the element is in its lower position, as seen in thedrawing.

The lower hub portion 18 is provided with a vertical notch 21 which is adapted to be engaged by a pin 22 carried by the shaft 11 when the discharge element 16 is in its lower position. When an excess of material is being conveyed, or more than can conveniently pass out through the side opening 13, the discharge element 16 is raised, by the pressure of the excess material, along the shaft 11 until it assumes its upper position indicated in dotted lines before the overflow opening 14. In this position, a pin 23 carried by the shaft 11 is adapted to engage with a vertical notch 24 formed in the hub portion 17 to rotate'the discharge element 16 in its upper position and eject material through the overflow opening 14. At the same time, of course, considerable material is being discharged through the discharge opening 13. As soon as the conveyer is again operating at normal capacity, the discharge element moves by gravity to its lower position, as shown in the drawing, to be reengaged by the pin 22 and discharge material through the opening 13.

From the foregoing it will be apparent that I have devised an improved discharge means for screw conveyers adapted to dis charge the material through a side opening in the conveyer casing, and also adapted upon pressure of excess material to 11 5 a discharge of the material through an additional overflow opening.

\Vhile I have shown by invention in but one form, it will be obvious to t skilled in the art that it is not so limitee, but is susceptible of various changz es and monitications, without departing from the spirit thereof, and I desire, tl'iercfc-re, that only such limitations shall be placed, hercnp-in'i as are imposed by the prior art or as are specifically set forth in the appended claims.

What I claim is:

1. In a screw conveyer apparatus, as cas' ing having a side discharge opening and be yond same an overflow opening, and a biased overflow valve normally interposed between said openings and movable respon sive to abnormal ressure of material in said casing to permit the discharge of same through said overflow openin 2. In a screw conveyer apparatus, a conveyer casing having a discharge opening and an overflow opening beyond the discharge opening in the direction of material being conveyed, a conveyor shaft, a biased discharge element releasably engaged by the conveyor shaft in front of the discharge opening, said discharge element being adapted to be moved to a position in front of the overflow opening by the pressure of an excess of material against it, and means for engaging the discharge element with the shaft in front of the overflow opening.

3. In a screw conveyer apparatus, a conveyer casing having a discharge opening and an overflow opening beyond the discharge opening in the direction of material being conveyed, a conveyer shaft, a bladed discharge element loosely mounted on the conveyer shaft in front of the discharge opening and adapted to be moved to a position in front of the overflow opening by the pressure of an excess of material against it, clutch means cooperating etween the bladed discharge element and the shaft for rotating the discharge element in front of the discharge opening, and other clutch means adapted to engage the discharge element and shaft to rotate it when moved to a position in front of the overflow openin 4. In a vertical screw conveyer ap )aratus, a conveyer casing having a discharge opening near its upper end and an overflow opening above the discharge opening, a conveyer shaft, a bladed discharge element loosely mounted on the conveyer shaft in front of the discharge opening and adapted to be moved by pressure of excess material to aposition in front of the overflow opening, and clutch means cooperating between the discharge element and the shaft to rotate the discharge element in either position.

5. In a vertical screw conveyer apparatus, a conveyer casing having a discharge opening near its upper end and an overflow opening above the discharge opening, a conveyer shaft, a bladed discharge element loosely mounted on the conveyer shaft in front of the discharge opening and adapted to be moved by pressure of excess material to a position in front of the overflow opening, a hub for the bladed element extending outwardly therefrom on both sides thereof, said hub having notches therein at both ends thereof, a pin carried by the shaft in front of the discharge opening to engage the notches on the lower end of the hub and effect rotation of the discharge element in its lower position, and a second pin carried by the upper end of the shaft in front of the overflow opening to engage the notches in the upper end of the hub and rotate the discharge element in front of the overflow opening.

(3. In a screw conveyer apparatus, a conveyer casing haviz Y a discharge opening and an overflow opening beyond, the discharge opening in the directimi of material being eonvq aha conveyer shaft, a biased discharge element releasably engaged by the conveyor shaft in front of the discharge opening, said discharge element being adapted to be moved to a position in front of the overflow opening by the pressure of an excess of material against it, means for engaging the discharge element with the shaft in front of the overflow opening, and means included in said discharge element to close off the overflow opening when said discharge element is in front of the discharge opening.

7. In a screw conveyer apparatus, a conveyer casing having a discharge opening and an overflow opening beyond the discharge opening in the direction of material being conveyed, a conveyer shaft, a bladed discharge element loosely mounted on the conveyer shaft in front of the discharge opening and adapted to be moved to a position in front of the overflow opening by the pressure of an excess of material against it, clutch means cooperating between the bladed discharge element and the shaft for rotating the discharge element in front of the discharge opening, other clutch means adapted to en gage the discharge element and shaft to rotate it when moved to a position in front of the overflow opening, and a plate extending transversely of the casing and forming the outer end of the bladed discharge element.

In testimony whereof I affix my signature.

THOMAS ELLIOTT.

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