Scraper assembly
Certain embodiments of the present invention provide a scraper assembly. For example, in one embodiment, a scraper assembly comprises: a substantially rigid member; a pin with a first end and a second end, wherein a tab protrudes from a side of the first end and the second end is attached to the substantially rigid member; a scraper head with a hole therethrough that is large enough to receive the pin, wherein the scraper head has a first channel that runs the depth of the scraper head and is large enough to receive the tab, and wherein the scraper head has a second channel that does not run the depth of the scraper head and is large enough to receive the tab; and a coil spring, wherein the coil spring is disposed around the pin and is held captive between the substantially rigid member and the scraper head.
1. A blending system comprising:
a tub having an inner surface;
an agitator having a shaft and a ribbon wound helically around said shaft, wherein said agitator is disposed within said tub such that said agitator can be rotated about said shaft without contacting said inner surface of said tub; and
a scraper assembly comprising:
a substantially rigid member, wherein said substantially rigid member is attached to said ribbon;
a pin with a first end and a second end, wherein a tab protrudes from a side of said first end and said second end is attached to said substantially rigid member;
a scraper head having at least one scraping surface, wherein said scraping surface contacts said inner surface of said tub, wherein said scraper head has a hole therethrough that is large enough to receive said pin, wherein said scraper head has a first channel that runs the depth of the scraper head and is large enough to receive said tab, and wherein said scraper head has a second channel that does not run the depth of the scraper head and is large enough to receive said tab; and
a coil spring, wherein said coil spring is disposed around said pin and is held captive between said substantially rigid member and said scraper head.
2. The system of claim 1 , wherein said pin has two tabs that protrude from opposite sides of said first end.
3. The system of claim 2 , wherein said scraper head has a third channel that runs the depth of the scraper head and is large enough to receive one of said tabs, and wherein said scraper head has a fourth channel that does not run the depth of the scraper head and is large enough to receive one of said tabs.
4. The scraper assembly of claim 3 , wherein said first channel and said third channel are spaced one hundred and eighty degrees apart around the circumference of said hole, wherein said second channel and said fourth channel are spaced one hundred and eighty degrees apart around the circumference of said hole, and wherein said first channel and said second channel are spaced ninety degrees apart around the circumference of said hole.
5. The system of claim 1 , wherein said substantially rigid member is welded to said ribbon and said pin is welded to said substantially rigid member.
6. The scraper assembly of claim 1 , wherein said pin is substantially perpendicular to said substantially rigid member.
7. The system of claim 1 , wherein said scraper head is composed of nylon.
8. The system of claim 1 , wherein said scraper head is composed of Peek.
9. The system of claim 1 , wherein said scraper head is composed of metal coated with plastic.
10. A scraper assembly for use in a blending system, said scraper assembly comprising:
a substantially rigid member;
a pin with a first end and a second end, wherein a tab protrudes from a side of said first end and said second end is attached to said substantially rigid member;
a scraper head having at least one scraping surface, wherein said scraper head has a hole therethrough that is large enough to receive said pin, wherein said scraper head has a first channel that runs the depth of the scraper head and is large enough to receive said tab, and wherein said scraper head has a second channel that does not run the depth of the scraper head and is large enough to receive said tab; and
a coil spring, wherein said coil spring is disposed around said pin and is held captive between said substantially rigid member and said scraper head.
11. The scraper assembly of claim 10 , wherein said pin has two tabs that protrude from opposite sides of said first end.
12. The scraper assembly of claim 11 , wherein said scraper head has a third channel that runs the depth of the scraper head and is large enough to receive one of said tabs, and wherein said scraper head has a fourth channel that does not run the depth of the scraper head and is large enough to receive one of said tabs.
13. The scraper assembly of claim 12 , wherein said first channel and said third channel are spaced one hundred and eighty degrees apart around the circumference of said hole, wherein said second channel and said fourth channel are spaced one hundred and eighty degrees apart around the circumference of said hole, and wherein said first channel and said second channel are spaced ninety degrees apart around the circumference of said hole.
14. The scraper assembly of claim 10 , wherein said pin is welded to said substantially rigid member.
15. The scraper assembly of claim 10 , wherein said pin is substantially perpendicular to said substantially rigid member.
16. The scraper assembly of claim 10 , wherein said scraper head is composed of nylon.
17. The scraper assembly of claim 10 , wherein said scraper head is composed of Peek.
18. The scraper assembly of claim 10 , wherein said scraper head is composed of metal coated with plastic.
19. A method for assembling a scraper assembly comprising:
providing a substantially rigid member with a pin attached thereto, wherein the pin has a tab protruding from a side of the end of the pin that is not attached to the substantially rigid member;
providing a coil spring;
winding said coil spring onto said pin by winding said coil spring around said tab until said coil spring is held captive between said substantially rigid member and said tab;
providing a scraper head having at least one scraping surface, wherein said scraper head has a hole therethrough that is large enough to receive said pin, wherein said scraper head has a first channel that runs the depth of the scraper head and is large enough to receive said tab, and wherein said scraper head has a second channel that does not run the depth of the scraper head and is large enough to receive said tab;
aligning said scraper head with said pin such that said tab is aligned with said first channel;
sliding said scraper head onto said pin, thereby compressing said coil spring, until said tab passes through said scraper head;
aligning said scraper head with said pin such that said tab is aligned with said second channel; and
releasing said scraper head, thereby allowing said coil spring to decompress.
20. The method of claim 19 wherein said pin is welded to said substantially rigid member.