The present application relates generally to mixing machines utilized for mixing food products such as cake batter, and more particularly to a mixing machine bowl scraper and related attachment system for the same.
The use of bowl scrapers in food mixing machines is known as from U.S. Pat. No. 4,946,285. The scraper is positioned to slide along the interior side of the mixing bowl to remove food product therefrom to assure more thorough mixing. The described arrangement in U.S. Pat. No. 4,946,285 requires the use of moving parts and therefore increases manufacturing costs.
Accordingly, it would be advantageous to provide a mixing machine with an improved bowl scraper and associated attachment system.
In one aspect, a bowl scraper for use in a mixing machine includes an attachment arm including an upper arm portion and a lower arm portion, wherein the upper arm portion and the lower arm portion are formed by a bent elongated member, the upper arm portion including a through opening extending through the bent elongated member, the through opening having a first portion and a second portion, the first portion of the through opening larger than the second portion of the through opening. A scraper extends downward from the lower arm portion.
Referring to
The mixing machine includes a drive assembly 26 for effecting rotation of the rotatable output member 24. In the illustrated machine the drive assembly is formed in part by a gear system 28 within the head 16 and having an upwardly extending input drive shaft 30. In the case of a planetary mixer, the gear system 28 may take the form of a planetary gear system, in which case the rotatable output member 24 rotates about its own axis 32, with the axis 32 rotating or “orbiting” around a central bowl axis 34. Also forming part of the drive assembly is a drive motor 36 that is mounted and located in line with the column 14 and includes an upwardly extending output shaft 38. A drive linkage 40 connects the motor output shaft 38 to the gear system input shaft 30 and may be formed by the illustrated belt 42 and pulleys 44 and 46. Alternative drive linkages could take the form of chain and sprocket combinations, additional gearing and/or bar-type linkages. The illustrated drive linkage 40 is a fixed linkage, meaning that the drive ratio between the motor output shaft 38 and the gear system input shaft 30 does not change.
The bowl 22 may be pivotally mounted for movement about a pivot axis 23 at one side of the bowl receiving portion 20, with the other side of the bowl receiving portion including a pin 25 for engaging part of the bowl and holding it in an operating position. Further details of such pivoting bowl arrangements are provided in U.S. Patent Application Publication No. U.S. 2002/0093877 A1, published Jul. 18, 2002.
Referring now to
The illustrated attachment arm 102 is substantially L-shaped, with upper arm portion 106 extending substantially vertically and lower arm portion 108 extending laterally from the upper arm portion 106. The scraper 104 extends downward from the lower arm portion 108. The attachment arm 102 and scraper 104 may be unitary with each other, with both portions being formed by bending an elongated steel member. The scraper 104 is bent to an appropriate shape to match a bowl to be scraped and may typically also include a urethane sleeve that slides onto the bent steel member.
An upper brace 120 extends from a region 122 of intersection of the upper arm portion 106 and the lower arm portion 108 and toward the scraper 104 along an upper side of 124 the lower arm portion 108. Similarly, a lower brace 126 extends from a region 128 of intersection of the lower arm portion 108 and the scraper 104 and toward the upper arm portion 106 along a lower side 130 of the lower arm portion 108. Both braces may be formed of steel that is welded to the primary elongated steel member forming the implement. As illustrated, each brace 120 and 126 may includes a respective curved portion 130 and 132 in the respective region 122 and 128 to match the curvature of such regions. The braces 120 and 126 add strength to the implement.
The protrusion 116 may be formed by a pin 134 that is inserted into an opening 136 machined in the side 118 of the upper arm portion 106. Alternatively, the protrusion could be formed unitary with the upper arm portion. In certain embodiments the protrusion could, for example, extend from the back side of the upper arm portion. In one embodiment, a distance D1 between a top edge of the through opening 110 and a top edge of the protrusion 116 is between about 3.2 inches and about 3.4 inches, and is preferably about 3.3 inches. The smaller portion 114 represents an install location of the through opening 110, and in one embodiment a distance D2 between a mid-point of the install location and the top edge of the protrusion 116 is between about 3.0 and 3.2 inches, and preferably about 3.125 inches.
Reference is now made to
In order to mount the scraper 100 onto the mixing machine, support 150 is rotated about axis 34 to bring support surface 158 toward a front of the mixing machine 10. Bowl 22 is unlatched from support arm 21 at pin 25 and pivoted about axis 23 to facilitate access to support surface 158. The lower portion 112 of the through opening is aligned with the protrusion 152 and a lower part of the upper arm portion 106 is angled away from the side shoulder 162. The scraper 100 is then moved toward the support 150 to pass the enlarged head 152 of the protrusion through the through opening. The scraper is then moved to locate the shaft 154 of the protrusion 152 in the upper portion 114 of the through opening, such position being shown in
In this resulting, installed position the side shoulder 162 cooperates with the side of the upper arm portion 106 to prevent further counterclockwise rotation about the mount protrusion 152, the forces exerted on the scraper during scraping acting to push the side of the upper arm portion 106 into the side shoulder. The protrusion 116 cooperates with the stop surface 164 to prevent the scraper from sliding upward along the support 150, the forces exerted upward on the scraper during scraping acting to push the protrusion against the stop surface 164. Additionally, forces exerted on the scraper during scraping will also tend to urge the upper arm portion 106 toward the enlarged head 156 of the mount protrusion 152. Thus, the scraper is held in place by mechanical forces exerted on in it during scraping operations. To remove the scraper, support 150 is rotated about axis 34 to bring support surface 158 toward a front of the mixing machine 10. Bowl 22 is unlatched from support arm 21 at pin 25 and pivoted about axis 23 to facilitate access to the support surface 158. The upper arm portion is rotated away from the side shoulder 162, the scraper arm is moved upward to position the head in the lower portion 112 of the through opening, and the scraper is pulled laterally away from the support 150.
While the above-described embodiment provides a through opening in which the enlarged portion is located below the smaller portion, it is recognized that variations are possible. For example, reference is made to
In another variation of the previously mentioned embodiment in which the protrusion extends from the back side of the scraper arm, the protrusion could be formed by the extending part of a pin that is spring-loaded into the scraper arm itself. In such an embodiment the surface 158 would include an opening formed therein to receive the pin when the scraper is mounted to the mixer. In such an embodiment, it is possible that the side shoulder and support surface could both be formed by the wall of the opening formed in the surface 158.
Referring now to
Referring to
Scraper 220, as shown, may be of unitary construction formed of a single piece of bent material, such a bent elongated steel member. Scraper 220 includes the upper connecting portion 222, downwardly extending lower portion 232 that includes segments 233 and 235, and a scraper portion 234 extending downwardly from the portion 232 (
As can best be seen by
When installed on the mixer for operation in connection with material in a mixing bowl, the engagement of the scraper portion with the inside surface of the mixing bowl 300 (shown in schematic, partial cross-section) urges the scraper inward (e.g., generally to the left in the view of
It is to be clearly understood that the above description is intended by way of illustration and example only and is not intended to be taken by way of limitation. Other changes and modifications could be made, including both narrowing and broadening variations and modifications of the appended claims.
The present application is a continuation-in-part of application Ser. No. 10/328,090, filed Dec. 23, 2002.
Number | Date | Country | |
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Parent | 10328090 | Dec 2002 | US |
Child | 11064209 | Feb 2005 | US |