Mowing Head for a Trimmer

Abstract

A mowing head for a trimmer is rotated about an axis of rotation when operated and has a housing with a circumferential wall. A fastening device with a trimmer line guide with a trimmer line channel is provided for the trimmer line. The trimmer line channel has a clamping section with a longitudinal direction. The clamping section has a wide longitudinal side and a narrow longitudinal side, both extending in the longitudinal direction. The clamping section has an inner width tapering from the wide longitudinal side toward the narrow longitudinal side. The trimmer line guide has a deflection edge adjoining the clamping section. The deflection edge is slanted relative to the longitudinal direction such that the deflection edge generates a force component acting on the trimmer line directed toward the narrow longitudinal side when a pulling force is acting on the trimmer line guided through the fastening device.

What is claimed is: 
     
         1 . A mowing head for a trimmer, the mowing head comprising:
 an axis of rotation about which the mowing head is driven in rotation when operated;   a housing comprising a circumferential wall;   at least one fastening device configured to secure a trimmer line on the mowing head, wherein the at least one fastening device comprises a trimmer line guide;   the trimmer line guide comprising at least one trimmer line channel;   the at least one trimmer line channel comprising a clamping section;   the clamping section having a longitudinal direction and comprising a wide longitudinal side extending in the longitudinal direction and a narrow longitudinal side extending in the longitudinal direction;   the clamping section comprising an inner width tapering in a direction from the wide longitudinal side toward the narrow longitudinal side;   the trimmer line guide comprising a deflection area adjoining the clamping section;   the deflection area comprising a deflection edge that is slanted relative to the longitudinal direction of the clamping section such that the deflection edge generates a force component acting on the trimmer line in a direction toward the narrow longitudinal side of the clamping section when a pulling force is acting on the trimmer line guided through the fastening device.   
     
     
         2 . The mowing head according to  claim 1 , wherein the longitudinal direction of the clamping section is positioned relative to the deflection edge at an angle of 10° to 80° in a section plane that is parallel to the axis of rotation and that contains the deflection edge, wherein the angle is oriented in a direction toward the trimmer line channel and opens in a direction toward the narrow longitudinal side of the clamping section. 
     
     
         3 . The mowing head according to  claim 1 , wherein, viewed in a radial direction relative to the axis of rotation, the narrow longitudinal side of the clamping section of the at least one trimmer line channel is arranged radially outwardly and the wide longitudinal side is arranged radially inwardly. 
     
     
         4 . The mowing head according to  claim 1 , further comprising an end face delimiting the mowing head in a direction of the axis of rotation, wherein the at least one trimmer line channel comprises a deflection contour that deflects the trimmer line guided through the fastening device from the circumferential wall toward the end face. 
     
     
         5 . The mowing head according to  claim 1 , wherein the at least one trimmer line channel includes a first trimmer line channel and a second trimmer line channel, wherein the deflection edge is arranged between the first and the second trimmer line channels. 
     
     
         6 . The mowing head according to  claim 5 , wherein the trimmer line guide further comprises a common partition web disposed between the first trimmer line channel and the second trimmer line channel, wherein the longitudinal direction of the clamping section of the first trimmer line channel and the longitudinal direction of the clamping section of the second trimmer line channel are approximately parallel to each other, wherein the first trimmer line channel has a first sidewall formed on the common partition web and the second trimmer line channel has a second sidewall formed on the common partition web opposite the first sidewall, and wherein the deflection edge is provided on an end face of the common partition web. 
     
     
         7 . The mowing head according to  claim 6 , wherein the first and second sidewalls are approximately parallel to each other. 
     
     
         8 . The mowing head according to  claim 1 , wherein the trimmer line guide begins at an inlet opening that is positioned in an entry direction and wherein the trimmer line guide ends at an outlet opening that is positioned in an exit direction. 
     
     
         9 . The mowing head according to  claim 8 , wherein the trimmer line guide has a straight entry line extending through the inlet opening and positioned in the entry direction and further has a straight exit line extending through the outlet opening and positioned in the exit direction, wherein the straight entry line and the straight exit line are skew relative to each other. 
     
     
         10 . The mowing head according to  claim 1 , wherein the housing comprises at least two housing parts, wherein the at least two housing parts delimit the trimmer line guide and are connected to each other by at least one rivet. 
     
     
         11 . The mowing head according to  claim 10 , wherein the at least one rivet forms a blade receptacle configured to suspend a blade. 
     
     
         12 . The mowing head according to  claim 11 , wherein the circumferential wall comprises an arc-shaped depression adjacent to the at least one rivet, wherein a center of the arc-shaped depression is positioned radially between the at least one rivet and the axis of rotation, and wherein, relative to a rotational direction of the mowing head in operation, the center is leading relative to a connecting plane containing the axis of rotation and containing a longitudinal axis of the at least one rivet, wherein a diameter of the arc-shaped depression corresponds at least to a width of the blade. 
     
     
         13 . A mowing head for a trimmer, the mowing head comprising:
 an axis of rotation about which the mowing head is driven in rotation when operated;   a housing comprising a circumferential wall;   at least one trimmer line;   at least one fastening device comprising a trimmer line guide and securing the at least one trimmer line on the mowing head;   the trimmer line guide comprising at least one trimmer line channel;   the at least one trimmer line channel comprising a clamping section;   the clamping section having a longitudinal direction and comprising a wide longitudinal side extending in the longitudinal direction and a narrow longitudinal side extending in the longitudinal direction;   the clamping section comprising an inner width tapering in a direction from the wide longitudinal side toward the narrow longitudinal side;   the trimmer line guide comprising a deflection area adjoining the clamping section;   the deflection area comprising a deflection edge and the at least one trimmer line is guided across the deflection edge;   the deflection edge being slanted relative to the longitudinal direction of the clamping section such that the deflection edge generates a force component acting on the at least one trimmer line in a direction toward the narrow longitudinal side of the clamping section when a pulling force is acting on the at least one trimmer line.