referring to fig1 , a mixing machine 10 includes a mixer body 12 having a base portion 14 , a head portion 16 and a support portion 18 ( e . g ., in the form of a column ) connecting the head portion and the base portion in a vertically spaced - apart relationship . a front - to - back head portion axis a is shown . an output member 20 ( e . g ., a shaft for receiving a mixer tool such as a beater or whip ) extends downward from the head portion 16 in a direction toward a bowl receiving location 22 formed between arms 24 of a bowl receiving yoke that can be moved up and down relative to the head portion 16 by rotation of a handle 26 . a motor is located within the head portion 16 and may be mechanically linked to the output member 20 , as by a gear system , for effecting rotation of the output member about a first axis 30 and rotation of the first axis 30 about a second axis 32 ( e . g ., a planetary movement or rotation ). although not shown in fig1 , in some embodiments , the mixing machine 10 includes a power take off that extends outwardly from a front side of the head portion 16 and may take the form of a protruding hub or boss that is adapted for connection with mixer accessories such as meat grinders , slicers , etc . internal of the power take off may be a drive member that is rotated by the motor that also rotates the output member 20 via the gear system . an exemplary mix position of a bowl 40 is shown by fig1 along with an exemplary position of a bowl guard assembly 42 . a bowl guard support 44 is located at an underside of the head portion 16 and supports at least part of the bowl guard assembly 42 in a manner that enables the bowl guard assembly to be moved between a bowl guarding position and a bowl access position . fig2 illustrates the bowl 40 and an arm assembly 46 in isolation . the arm assembly 46 includes the arms 24 a and 24 b that are used to support the bowl 40 . each arm 24 a and 24 b includes a mount protrusion 48 a and 48 b and a bowl guide pin 50 a and 50 b that are located alongside their respective mount protrusion . the mount protrusions 48 a , 48 b and bowl guide pins 50 a , 50 b extend upwardly from an upper surface 52 a , 52 b of their respective mount arms 24 a , 24 b . fig3 shows a side , detail view of one of the mount protrusions 48 extending upwardly from surface 52 . the mount protrusions 48 include a tapered head portion 54 and a stem portion 56 that is narrower than the head portion to form a notch 58 between the head portion and the surface 52 . the head portion 54 may be other shapes , however , in the illustrated embodiment , the head portion is in the shape of a truncated cone . referring back to fig2 , the bowl 40 includes a bowl - shaped body 60 and a pair of bowl mount supports 62 a and 62 b extending outwardly from an exterior surface 64 of the bowl - shaped body . each bowl mount support 62 a , 62 b includes a keyway 66 a , 66 b including an enlarged portion 68 a , 68 b and a necked - down or narrower portion 70 a , 70 b . extending inwardly from a periphery of each bowl mount support 62 a , 62 b is a guide pin receiving notch 72 a , 72 b . referring to fig4 , the bowl 40 is illustrated in an initial bowl connect position . as can be seen , the enlarged portions 68 a , 68 b of the keyways 66 a , 66 b are sized and arranged to simultaneously receive the mount protrusions 48 a , 48 b such that their enlarged head portions 54 a , 54 b extend upwardly through the keyways and beyond the bowl mount supports 62 a , 62 b . the bowl guide pins 50 a and 50 b are engaged by the bowl mount supports 62 a and 62 b within the pin receiving notches 72 a and 72 b . the bowl guide pins 50 a , 50 b are used to stabilize the bowl 40 and allow controlled forward tilting of the bowl with the protrusions 48 a , 48 b located at the enlarged portions of their respective keyways 66 a , 66 b . without the bowl guide pins 50 a and 50 b , the bowl 40 would tend to tilt forward ( in the direction of arrow 69 ) an undesired amount due to the size of the enlarged portions 68 a , 68 b , notches 58 and position of the protrusions 48 a , 48 b , arms 24 a , 24 b and bowl mount supports 62 a , 62 b rearward on the bowl - shaped body 60 . some forward tilting of the bowl 40 can be desirable , for example , to expose more of the bowl &# 39 ; s interior to the operator . forward tilting of the bowl 40 an undesired amount can require forward and rearward maneuvering to lift the bowl from the arms 24 a , 24 b . as can be seen , the arms 24 a and 24 b together extend about the bowl - shaped body 60 a distance less than 180 degrees ( e . g ., about 120 degrees ). in other embodiments , however , the arms may extend about the bowl - shaped body 60 to a greater or lesser degree than illustrated . in order to secure the bowl 40 in place on the mount arms 24 , the bowl is rotated , in this instance , in a clockwise direction ( a securing direction ) which locates the necked - down portions 70 a and 70 b within the notches 58 as shown by fig5 . locating the necked - down portions 70 a , 70 b in the notches 58 places edges of the keyways 66 a , 66 b underneath the head portions 54 of the mount protrusions 48 thereby capturing the bowl mount supports 62 a , 62 b between the enlarged head portions 54 and the surface 52 of the arms 24 a , 24 b . in some instances , the bowl 40 may be turned manually to secure the bowl in place on the mount arms 24 . in other instances , the mixing action of the mixer tool and its planetary motion provides sufficient turning force to turn the bowl in its securing direction ( e . g ., clockwise ) to lock the bowl in place as shown by fig5 without any manual application of turning force . in some embodiments , an automated bowl turning device may be provided for turning the bowl in its securing direction . to release the bowl 40 , the bowl is rotated in a counter - clockwise direction ( an unsecuring direction ), which locates the mount protrusions 48 at the enlarged portions 68 a , 68 b of the keyways 66 a , 66 b . in addition to controlling the amount of forward tilt of the bowl 40 , the bowl guide pins 50 a , 50 b serve as stops to prevent over rotation of the bowl and to align the enlarged head portions 54 of the mount protrusions 48 with the enlarged portions 68 a , 68 b of the keyways 66 a , 66 b such that the bowl can be lifted vertically from the arms 24 a , 24 b with the head portions passing through the enlarged portions of the keyways . use of the bowl guide pins 50 a , 50 b can reduce the need for an operator to reposition the bowl 40 to align the enlarged portion 68 a , 68 b of the keyways 66 a , 66 b with the enlarged head portions 54 in the event of over rotation of the bowl so that the bowl can be removed . fig6 illustrates another advantage of the above - described bowl attachment system , particularly in relatively heavy duty applications ( e . g ., 60 to 140 quarts ). as mentioned above , the arm assembly 46 can be moved up and down to lift and lower the bowl 40 between mixing and access positions . in heavy duty applications , the lifting and lowering of the bowl 40 and arm assembly 46 may be accomplished via a powered , mechanical system , as opposed to the handle described above . in some embodiments after a mixing operation , the bowl 40 may be rotated in the unsecuring direction as described above to align the enlarged portions 68 of the keyways 66 with the mount protrusions 48 . in this position , the bowl guide pins 50 are engaged by the bowl mount supports 62 within the pin receiving notches 72 . the bowl guide pins 50 serve to align the mount protrusions 48 with the enlarged portions 68 of the keyways 66 and control forward tilting of the bowl 40 . a hand truck 74 may be positioned beneath the bowl 40 prior to lowering the bowl . as the bowl 40 is lowered by the power lifting system , the bowl engages the hand truck 74 and is lifted from the mount arms 24 with the mount protrusions 48 passing through the enlarged portions 68 of the keyways 66 . this lifting of the bowl 40 from the mount arms 24 can be accomplished without any need for additional positioning of the bowl once the bowl is rotated to its unsecuring position with the bowl guide pins 50 engaged within the pin receiving notches 72 of the bowl mount supports 62 . referring now to fig7 , in some embodiments , such as in heavier duty applications ( e . g ., 20 quarts or higher ), a bowl 80 includes a rear support member 82 that is used to provide additional support for the bowl when it is mounted on support arms 24 of a mixing machine 84 ( see fig8 ) in a fashion similar to that described above . the rear support member 82 is offset from a midpoint m on an arc spanning between bowl mount supports 86 . referring also to fig8 , this offset allows the rear support member 82 to be placed within a central mounting slot 88 provided on mixing body 90 of the mixing machine 84 when the bowl 80 is rotated as described above . in some embodiments , the central mounting slot 88 is connected to the arm assembly 46 and moves up and down therewith . 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 , and that changes and modifications are possible . for example , referring to fig9 , the orientation of the keyways may be reversed so that counter - clockwise rotation of the bowl places the bowl in its securing position and clockwise rotation of the bowl aligns the mount protrusions with the enlarged portions of the keyways . accordingly , other embodiments are contemplated and modifications and changes could be made without departing from the scope of this application .
a mixing machine includes a head including a rotatable output member for receiving a mixer tool . a mixer body includes a bowl receiving assembly below the head . the bowl receiving assembly includes a pair of bowl support arms extending outwardly from the mixer body to respective ends located at opposite sides of a bowl receiving location . each bowl support arm includes a mount protrusion extending upwardly therefrom . the mount protrusions include a notch located at bases of the mount protrusions . the bowl receiving assembly is mounted for movement between a lowered position away from the head and a raised position toward the head .