Abstract:
A fixed-line rotary trimmer head is provided having pivoting posts (line holding mechanisms) which allow folded strips of trimmer line to pivot out of the way when impacting stones, metal posts and the like to reduce wear and tear on the line and reduce line breakage, the trimmer line is loaded from the underside of the trimmer head and follows an approximate 90 degree curvilinear channel so that the distal ends of the line extend out the side of the trimmer head for use, the trimmer head also comprises means for pushing the trimmer line partially out of the channel for ease of use and for removal of unused trimmer line.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the benefit of U.S. Provisional Application No. 61/758,831, filed Jan. 31, 2013 and U.S. Provisional Application No. 61/829,350, filed May, 31, 2013, the entire disclosures of which are hereby incorporated herein by reference. 
     
    
     BACKGROUND 
       [0002]    Vegetation trimming devices are well known and are commonly used to maintain one&#39;s lawn and garden. There are a number of different classes of rotary trimmer heads, defined generally by the manner in which a monofilament trimmer line is fed, spooled or replaced in the trimmer head and/or how the trimmer line is discharged, indexed or lengthened during use of the trimmer head. 
         [0003]    A first class of rotary trimmer head is the “self-indexing” trimmer head. With this type of trimmer head, a replaceable spool of trimmer line is used. These trimmer heads contain a mechanism to lock and unlock the relative rotation of the spool of trimmer line based on centrifugal forces which change the length of the line and allow for additional line to be released from the spool. As the line wears, there is less air drag and the rotational speed of the trimmer head increases. With the increased rotational speed, the mechanism unlocks the spool and additional trimmer line is released. The trimmer head speed then slows due to increased air drag on the longer length of trimmer line and the mechanism locks the spool. No manual feeding of new trimmer line is required. This trimmer head design undesirably limits the consumer&#39;s options regarding line selection. 
         [0004]    A second class of rotary trimmer head is the “bump-fed” or “bump-activated” trimmer head. These trimmer heads are designed with a bump knob or similar ground contacting member that is mechanically linked to the internal spool in the rotary trimmer head such that both parts (the bump knob and the internal spool) have the same rotational speed. As with the self-indexing trimmer heads, the air drag helps to pull the line from the head. In addition, when the bump knob impacts the ground, the difference in rotational speed between the internal spool and the housing also helps push the line out. When the bump knob impacts the ground, the rotational speed of the knob and spool are slowed. The bumping action creates a vertical upward force which lifts the spool upward in the housing and briefly unlocks the spool from the housing so that the spool rotates independently. Some bump-fed trimmer heads are specific to the rotational direction of the trimmer device while others are “universal” and can be used with trimmers which rotate clockwise or counterclockwise. Because the indexing of the line is automatic upon striking the bump knob on the ground, control of the exact length of additional line that is indexed can be difficult. 
         [0005]    A third class of rotary trimmer head is the “fixed-line” trimmer head. The majority of aftermarket trimmer heads for rotary trimmers that are sold are fixed-line trimmer heads because they are easily designed to be universally adaptable to essentially any brand of rotary trimmer regardless of the operation of the trimmer head or the direction of rotation. This type of trimmer head is loaded manually and eliminates the need for a spool. The head uses a base having a series of spaced line holders or an easy means of inserting, holding and/or removing multiple trimmer lines. As the line wears, the consumer manually inserts a new length of trimmer line into the line channel. There is no indexing or lengthening of the line during use; and, the consumer can control the length of line that is inserted. Unfortunately, when trimmer line strikes solid objects such as rocks and wooden or metal fences, which is common during use, the trimmer line tends to break thus requiring the consumer to remove the broken line and re-load fresh line quite often. 
         [0006]    Incorporating pivoting technology into fixed -line trimmer heads is proving to be beneficial to increasing the life of trimmer line. U.S. Pat. Nos. 7,603,782 and 7,743,511 by Orlando Jerez disclose a trimmer head with pivoting line holding mechanisms, hereby incorporated by reference. The invention disclosed by Orlando Jerez includes many means of holding a folded strip of line. However, all of the concepts introduced by Jerez involve a line holding means located on the top of the trimmer head. The trimmer line is loaded into the line-holding mechanism in the limited space defined by the lower surface of the debris shield on the trimmer, the upper surface of the trimmer head, and the gearbox and/or hub of the trimmer head. Additionally, there is no means provided to assist with removing the used strip of line from the line holding mechanism. During use, the folded strip of line is pulled tightly into the straight through line channels. Many consumers report the need to use a pair of needle nose pliers to pinch the backend of the folded line to remove the U-shaped portion of the used trimmer line. 
         [0007]    One of the objectives of this invention is to provide a novel trimmer head with pivoting line-holding mechanisms that can be loaded from the ground-facing surface of the trimmer head. 
         [0008]    Another objective of this invention is to provide a novel trimmer head with a means to push a U-shaped piece of trimmer line partially out of the pivoting line-holding mechanism for the purpose of facilitating removal of the remaining line after use. 
         [0009]    A third objective of this invention is to provide a method for removal of the unused portion of a trimmer line remaining in the line holder after use of the line for trimming vegetations. 
       BRIEF SUMMARY 
       [0010]    In an embodiment there is provided a trimmer head having a main housing and at least two line holder mechanisms peripherally spaced apart and attached to said housing to achieve a balanced rotation about a vertical axis, said attachment of the line holder mechanisms allowing oscillation of each line holder mechanism about their respective vertical axes, each line holder mechanism capable of securing a separate length of flexible trimmer line in said housing during rotational operation of the powered trimmer device, wherein each of said lengths of trimmer line is inserted into each line holder mechanism from the underside of the main housing without necessitating removal of the trimmer head from the powered trimmer device. 
         [0011]    In an embodiment there is provided a trimmer head having a main housing and at least two line holder mechanisms peripherally spaced apart and attached to said housing to achieve a balanced rotation about a vertical axis, said attachment of the line holder mechanisms allowing oscillation of each line holder mechanism about their respective vertical axes, each line holder mechanism capable of securing a separate length of flexible trimmer line in said housing during rotational operation of the powered trimmer device, wherein each of said lengths of trimmer line is inserted into each line holder mechanism from the underside of the main housing without necessitating removal of the trimmer head from the powered trimmer device and said trimmer line is fed through a curvilinear channel where the distal ends of the trimmer line exit on the vertical side of the main housing. 
         [0012]    In an embodiment there is provided a trimmer head wherein unused lengths of trimmer line can easily be removed from the trimmer head without necessitating removal of the trimmer head from the powered trimmer device, such means comprising an elongated vertical blade, said blade movable between a first upper position where the blade is not in contact with said trimmer line and a second lower position where the blade contacts the trimmer line at a point exterior of the underside of a trimmer head main housing, said blade pushing the trimmer line out and away from the underside of the main housing, and a spring and an actuator, said spring biasing the blade into the first upper position and said actuator moving the blade to the second lower position when activated. 
         [0013]    For a fuller understanding of the nature and advantages of the present invention, reference should be made to the ensuing detailed description and accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0014]      FIG. 1  shows a side view of a first embodiment of the invention; 
           [0015]      FIG. 2  shows a perspective view of the embodiment shown in  FIG. 1 ; 
           [0016]      FIG. 3  shows a bottom view of the embodiment shown in  FIG. 1 ; 
           [0017]      FIG. 4  shows a bottom perspective view of the embodiment shown in  FIG. 1 ; 
           [0018]      FIG. 5  is a side view of the embodiment shown in  FIG. 1 ; 
           [0019]      FIG. 6  is an upper perspective view of the cover of the embodiment shown in  FIG. 1 ; 
           [0020]      FIG. 7  is a lower perspective view of the cover of the embodiment shown in  FIG. 1 ; 
           [0021]      FIG. 8  is an upper perspective view of the main housing of the embodiment shown in  FIG. 1 ; 
           [0022]      FIG. 9  is an upper perspective view of the main housing of the embodiment shown in  FIG. 1  with the pivot post installed; 
           [0023]      FIG. 10  is a cutaway view of an installed pivot post assembly of the embodiment shown in  FIG. 1 ; 
           [0024]      FIG. 11  is a cutaway view of an installed pivot post assembly of the embodiment shown in  FIG. 1 ; 
           [0025]      FIG. 12  is a cutaway view of an installed pivot post assembly of the embodiment shown in  FIG. 1 ; 
           [0026]      FIG. 13  shows the pivot post assembly of the embodiment shown in  FIG. 1 ; 
           [0027]      FIG. 14  is a perspective view of the bearing ring of the pivot post of the embodiment shown in  FIG. 1 ; 
           [0028]      FIG. 15  is a perspective view of a pivot post assembly of the embodiment shown in  FIG. 1   
           [0029]      FIG. 16  is a perspective view of a lower part of the pivot post assembly of  FIG. 15 ; 
           [0030]      FIG. 17  is a perspective view of a lower part of the pivot post assembly of  FIG. 15 ; 
           [0031]      FIG. 18  is a side view of the lower part of the pivot post assembly of  FIG. 15 ; 
           [0032]      FIG. 19  is a lower perspective view of the lower part of the pivot post assembly of  FIG. 15 ; 
           [0033]      FIG. 20  shows the lower part of the pivot post assembly of  FIG. 15 ; 
           [0034]      FIG. 21  is a side perspective view of the upper part of the pivot post assembly of  FIG. 15 ; 
           [0035]      FIG. 22  is a perspective view of the upper part of the pivot post assembly of  FIG. 15 ; 
           [0036]      FIG. 23  is a top view of the upper part of the pivot post assembly of  FIG. 15 ; 
           [0037]      FIG. 24  is a bottom perspective view of the upper part of the pivot post assembly of  FIG. 15 ; 
           [0038]      FIG. 25  shows a side view of an embodiment of the invention; 
           [0039]      FIG. 26  shows a top view of the embodiment shown in  FIG. 25 ; 
           [0040]      FIG. 27  shows a lower perspective view of the embodiment shown in  FIG. 25 ; 
           [0041]      FIG. 28  is a perspective view of the ground contacting member designed to snap onto the lower side of the embodiment shown in  FIG. 25 ; 
           [0042]      FIG. 29  is a bottom view of the embodiment shown in  FIG. 25 , with the ground contacting member removed; 
           [0043]      FIG. 30  is a top perspective view of the cover of the embodiment shown in  FIG. 25 ; 
           [0044]      FIG. 31  is a bottom perspective view of the cover of the embodiment shown in  FIG. 25 ; 
           [0045]      FIG. 32  is a side perspective view of the main housing of the trimmer head of the embodiment shown in  FIG. 25 ; 
           [0046]      FIG. 33  is a top view of the main housing of the trimmer head of the embodiment shown in  FIG. 25 ; 
           [0047]      FIG. 34  is a side perspective view of the line holding mechanism of the embodiment shown in  FIG. 25 ; 
           [0048]      FIG. 35  is a top perspective view of the line holding mechanism of the embodiment shown in  FIG. 25 ; 
           [0049]      FIG. 36  is a bottom perspective view of the line holding mechanism of the embodiment shown in  FIG. 25 ; 
           [0050]      FIG. 37  is a cutaway view of the line holding mechanism and bearing sleeve of the embodiment shown in  FIG. 25  with the spring removed; 
           [0051]      FIG. 38  is a cutaway of the line holding mechanism of the embodiment shown in  FIG. 25 ; 
           [0052]      FIG. 39  is a side perspective cutaway view of the button of the embodiment shown in  FIG. 25 ; 
           [0053]      FIG. 40  is a top perspective cutaway view of the button of the embodiment shown in  FIG. 1 ; 
           [0054]      FIG. 41  is a bottom perspective cutaway view of the button of the embodiment shown in  FIG. 25 ; 
           [0055]      FIG. 42  is a perspective view of a first side of the blade of the embodiment shown in  FIG. 25 ; 
           [0056]      FIG. 43  is a side view of the blade of the embodiment shown in  FIG. 25 ; 
           [0057]      FIG. 44  is a perspective view of a second side of the blade of the embodiment shown in  FIG. 25 ; 
           [0058]      FIG. 45  is an upper perspective view of the upper and lower housings of the line holding mechanism of the embodiment shown in  FIG. 25 , assembled; 
           [0059]      FIG. 46  is a top view of the upper and lower housings of the line holding mechanism of the embodiment shown in  FIG. 25 , assembled; 
           [0060]      FIG. 47  is a bottom perspective view of the lower housing of the line holding mechanism of the embodiment shown in  FIG. 25 ; 
           [0061]      FIG. 48  is a top perspective view of the lower housing of the line holding mechanism of the embodiment shown in  FIG. 25 ; 
           [0062]      FIG. 49  is a side view of the lower housing of the line holding mechanism of the embodiment shown in  FIG. 25 ; 
           [0063]      FIG. 50  is a top view of the lower housing of the line holding mechanism of the embodiment shown in  FIG. 25 ; 
           [0064]      FIG. 51  is a side view of the upper housing of the line holding mechanism of the embodiment shown in  FIG. 25 ; 
           [0065]      FIG. 52  is a side perspective view of the upper housing of the line holding mechanism of the embodiment shown in  FIG. 25 ; 
           [0066]      FIG. 53  is a top view of the upper housing of the line holding mechanism of the embodiment shown in  FIG. 25 ; 
           [0067]      FIG. 54  shows a typical bearing sleeve used in the embodiment shown in  FIG. 25 ; 
           [0068]      FIG. 55  is a cross-sectional cutaway view of the embodiment shown in  FIG. 25 ; 
           [0069]      FIG. 56  is a side perspective view of a third embodiment of the present invention; 
           [0070]      FIG. 57  is a bottom perspective view of the embodiment shown in  FIG. 56  with the ground contacting member removed; 
           [0071]      FIG. 58  is a top perspective view of the embodiment shown in  FIG. 56  with the cover removed; 
           [0072]      FIG. 59  is a sliced view of the embodiment shown in  FIG. 56  shown without the ground contacting member, taken between the two main layers of the main housing; 
           [0073]      FIG. 60  is a bottom view of the cover of the embodiment shown in  FIG. 56 ; 
           [0074]      FIG. 61  is an inside perspective view of the ground contacting member of the embodiment shown in  FIG. 56 ; 
           [0075]      FIG. 62  is a side perspective view of the line-holding mechanism of the embodiment shown in  FIG. 56  with two bearing sleeves; 
           [0076]      FIG. 63  is a cutaway view through the main housing, line holding mechanism and bearing sleeves of the embodiment shown in  FIG. 56 ; 
           [0077]      FIG. 64  is a cutaway view through the main housing, line holding mechanism and bearing sleeves of the embodiment shown in  FIG. 56  depicted with the line holding mechanism removed; 
           [0078]      FIG. 65  is a cutaway line drawing of the line holding mechanism of the embodiment shown in  FIG. 56  taken through the blade; 
           [0079]      FIG. 66  is a cutaway line drawing of the line holding mechanism of the embodiment shown in  FIG. 56  taken through one of the line channels; 
           [0080]      FIG. 67  depicts the main housing of the embodiment shown in  FIG. 56 ; 
           [0081]      FIG. 68  depicts the blade use to push the line out of the line channel; and 
           [0082]      FIG. 69  is a cutaway view of the blade pressed into the button; 
           [0083]      FIG. 70  shows a perspective of a preferred embodiment of the present invention; 
           [0084]      FIG. 71  shows a side view of the embodiment shown in  FIG. 70  with trimmer line extending from the line-holding mechanism; 
           [0085]      FIG. 72  shows a bottom view of the embodiment shown in  FIG. 70  with the trimmer line installed; 
           [0086]      FIG. 73  shows the trimmer line pushed out from the trimmer head after the user has activated the button; and 
           [0087]      FIG. 74  shows the button released, and the loop of trimmer line that can be pinched and pulled out of the head by the user. 
       
    
    
     DETAILED DESCRIPTION 
       [0088]    A first embodiment of the trimmer head  10  of the present invention is shown in  FIGS. 1-24 . The embodiment shown in  FIGS. 1-24  incorporates three line holding mechanisms  14   a - 14   c.  One of the line holding mechanisms  14  is shown in  FIG. 15 . The terms “line holding mechanism”, “pivoting post” and “pivot post” are used herein interchangeably. The head  10  comprises a main housing  11  and a cover  12 . The main housing  11  of the trimmer head  10  as shown in  FIGS. 8 and 9  has three openings  29  for receiving each line holding mechanism  14 . 
         [0089]    Main housing  11  can best be seen in  FIGS. 3 ,  4 ,  5   8  and  9 .  FIGS. 3 and 4  show the underside of main housing  11  and  FIGS. 8 and 9  show the top of main housing  11 . The main housing  11  has three pairs of openings  26 - 29 . Main housing  11  is constructed of two spaced layers  19  and  21  (best seen in  FIG. 5 ) connected by a central hub  25 . Each pair of openings are aligned vertically, one in each layer of the main housing  11 , and constructed so that the assembled line holding mechanism  14  can be inserted into the openings from above ( FIG. 9  shows line holding mechanism  14  inserted into opening). As can best be seen in  FIG. 8 , openings include upper plate opening  26 , first lower plate opening  27 , lower plate stop  28 , and second lower plate opening  29 . A bearing sleeve  17  is inserted into the first lower plate opening  27 , resting on stop  28 . Then the assembled line holding mechanism  14  is installed into the same opening through upper plate opening  26  and through bearing sleeve  17 . After all line holding mechanisms  14  being used are in place, cover  12  is placed over the main housing  11  to hold the line holding mechanisms in place. Cover  12  is fastened to the main housing  11  preferably using six screws  13 , as shown in  FIG. 2 , although other fastening mechanisms used in the industry could also be utilized. 
         [0090]    As shown best in  FIGS. 2 and 7 , cover  12  comprises a three-pronged shaped to accommodate the number of line holding mechanisms  14  utilized. Cover comprises opening  18  located in the center and shaped/sized to allow passage of a trimmer drive shaft there through to accomplish attachment of head  10  to trimmer device (not shown).  FIG. 7  best shows cavities  23   a - 23   c  for receiving of line holding mechanism  14 . Cover  12  and cavity  23  (the necessary number of cavities depending on the number of line holding mechanisms  14  employed) fit over line holding mechanism  14 . Opening  24  is shaped and sized to receive the main housing hub  25  to further secure cover to main housing. 
         [0091]    Referring to  FIG. 3 , the trimmer head  10  is attached to a trimmer machine by placing a fastener (not shown) with a hexagon head into the hexagon shaped cavity  20 . Either the stem from the trimmer or the stem from a bolt would pass through the opening  18  shown in  FIG. 2 . The head would then be rotated to turn the fastener, until the head was fully threaded onto the trimmer machine. 
         [0092]    The line holding mechanisms are confined vertically between the bearing sleeves  17  and the cover  12 , and are confined along their perimeters by the perimeter of each opening  26 ,  27 ,  29  in the housing  11 . The line holding mechanisms  14  are allowed to pivot about a vertical axis. 
         [0093]    Each of the pivoting line holding mechanisms  14  are preferably assembled using five pieces, excluding the bearing sleeve  17 . The upper housing  16  for the line holding mechanism is shown separately in  FIGS. 21-24 . This is placed over the lower housing  15 , shown separately in various views in  FIGS. 16-20 . The upper housing  16  and lower housing  15  as assembled are shown in  FIGS. 13 and 15 . The interior surfaces of the upper and lower housings are shaped such that when combined, each pair creates a passageway for holding a folded strip of line. The two line channels  35  are separated by interior surface rib  36  shown in  FIG. 17 . Rib  32  further receives slot  33  from upper housing to secure line holding mechanism together. Interior surface  36  of lower housing provides support surface for upper plate and helps to define channels  35 . Opening  37  ( FIG. 18 ) can receive a tool as needed to assist with removal of line from the head  10 . One advantage of this multi-piece construction of the line channels is that the line channels are not restricted to being parallel. The line channels are curvilinear, allowing the line to be loaded at a ninety degree angle from the exit position. However, the design is not restricted to a ninety degree orientation. The angle formed by the line portion entering the pivoting assembly relative to the line portion existing the pivoting assembly could be greater or less than ninety degrees. 
         [0094]    Each pivoting line holding mechanism  14  is designed to hold one folded strip of line. Referring to  FIGS. 15 and 17 , the two distal ends of line are inserted into the openings  31  a and  31  b from the underside of main housing  11 . The trimmer line ends are pushed into the line channels  35  discussed above which are formed between the upper  16  and lower  15  housings. The line ends will follow the curvilinear path and will eit the line holding mechanism  14  at line outlets  30   a,    30   b  located on the side of main housing  10  (see  FIG. 10 ). The user would continue to push the line into the channel, or would pull the free ends of the trimmer line until the folded strip of line is fully inserted. This process would be repeated until a folded strip of trimmer line is installed into each of the three line-holding mechanisms for this embodiment. 
         [0095]    The preferred embodiment of the present invention has three pivoting line-holding mechanisms, spaced 120 degrees apart. However, other embodiments having various numbers of the pivoting line-holding mechanisms equally spaced would also function equally well. For example, the trimmer head could be designed to have two pivoting line-holding mechanisms spaced 180 degrees apart, or four pivoting line-holding mechanisms, each equally spaced 90 degrees apart. Likewise, five or more pivoting line-holding mechanisms could be used as long as the weight was uniformly distributed to allow for balanced rotation about a vertical axis. Similarly, the number of screws or other mechanisms utilized to secure the cover to the main housing and thereby secure the line holding mechanisms within the head cavity may also vary accordingly. 
         [0096]    For the embodiment shown in  FIGS. 1-24  as well as the embodiment shown in  FIGS. 25-55  and most generally in  FIGS. 25-27 , the outer most perimeter of the head is preferably round. However, this is not a functional requirement. The outer most perimeter of the head could be any shape as long as it was balanced with regards to rotational spinning about a vertical axis. 
         [0097]    The embodiment shown in  FIGS. 25-55  is generally identical to the embodiment described above in  FIGS. 1-24  but features an optional ground contacting member  111  and blade  119 . This embodiment incorporates three line-holding mechanisms  114  spaced 120 degrees apart. One of the line holding mechanisms  114  is shown in  FIG. 35 . The main housing  112  of the trimmer head as shown in  FIGS. 32 and 33  has three pairs of openings  124 . The main housing is constructed of two spaced layers connected by a central hub. Each pair of openings are aligned vertically, one in each layer of the main housing, and constructed so that the assembled line-holding mechanism can be inserted from above. A bearing sleeve  115  must first be inserted into the lower level of the opening  124  in the main housing. Then the assembled line-holding mechanism  114  would be installed in the same opening. After the three line-holding mechanisms  114  are in place, cover  113  shown in  FIG. 30  is placed over the main housing to hold the line-holding mechanisms in place. Cover  113  is fastened to the main housing  112  preferably using six screws  120 , as shown in  FIGS. 25-27 . 
         [0098]    The line-holding mechanisms are confined vertically between the bearing sleeves  115  and the cover  113 , and are confined along their perimeters by the perimeter of each opening  124  in the housing  112 . The line-holding mechanisms  114  are allowed to pivot about a vertical axis within the limits defined by the impingement of the vertical walls  150   a  and  150   b  shown in  FIG. 49  against the stop  149  shown on the inside of cover  113  in  FIG. 31 . This limit to the rotation is not required for the functioning of the trimmer head, but assists in maintaining the pivot post in their preferred orientation, which is to have the exit holes  128   a  and  128   b  (shown in  FIG. 49 ) pointing generally outward (away from the rotational center of the trimmer head). 
         [0099]    Referring to  FIG. 29 , the trimmer head is attached to a trimmer machine by placing a fastener (not shown) with a hexagon head into the hexagon shaped cavity  122 . Either the stem from the trimmer or the stem from a bolt would pass through the opening  123  shown in  FIGS. 29-32 . The head would then be rotated to turn the fastener, until the head was fully threaded onto the trimmer machine. 
         [0100]    In  FIG. 29 , the ground contacting member  111  is not shown. It would be added after the assembled trimmer head is attached to the powered rotary machine (string trimmer or brush cutter machine). The ground contacting member  111  attaches to the main housing by pushing the three tabs  121  (see  FIG. 28 ) through the three slots  127  (see figure  FIG. 32 ). However, use of the ground contacting member is optional. 
         [0101]    Each of the pivoting line-holding mechanisms  114  are preferably assembled using five pieces, excluding the bearing sleeve  115  shown in  FIGS. 38 and 54 . The upper housing  117  for the line holding mechanism is shown separately in  FIGS. 51-53 . This is placed over the lower housing  116 , shown separately in various views in  FIGS. 47-50 . The upper housing  117  and lower housing  116  as assembled are shown in  FIGS. 45 and 46 . The interior surfaces of the upper and lower housings are shaped such that when combined, each pair creates a passageway for holding a folded strip of line. At the upper end of this line passageway, the two line channels are separated by rib  143  shown in  FIG. 48 . At the lower end of this passageway, separation of the two legs of the folded line strip is separated by the blade  119  to be discussed later. Without this blade, there is no separation of the two legs of the folded line strip. One advantage of this multi-piece construction of the line channels is that the line channels are not restricted to being parallel. The line channels are curvilinear, allowing the line to be loaded at a ninety degree angle from the exit position. However, the design is not restricted to a ninety degree orientation. The angle formed by the line portion entering the pivoting assembly relative to the line portion existing the pivoting assembly could be greater or less than ninety degrees. 
         [0102]    Each pivoting line-holding mechanism is designed to hold one folded strip of line (see  FIGS. 70-74 ). Referring to  FIG. 36 , the two distal ends of line are inserted into the openings  130   a  and  130   b.  The trimmer line ends are pushed into the line channels discussed above which are formed between the upper  117  and lower  116  housings. The line ends will follow the curvilinear path and will exit the line-holding mechanism  114  at channels  128   a  and  128   b.  The user would continue to push the line into the channel, or would pull the free ends of the trimmer line until the folded strip of line is fully inserted.  FIGS. 70-72  show the line installed. This process would be repeated until a folded strip of trimmer line is installed into each of the three line-holding mechanisms for this embodiment. 
         [0103]    When the user of the embodiment powers the trimmer machine, the distal ends of the folded strip of line will extend radially outward due to the centrifugal force caused by the rotation of the trimmer head. Due to the high spin rate the tips of the trimmer line are capable of cutting vegetation. However, if the tips of the trimmer line were to impact an immovable object such as a metal pole or rock, then the line-holding mechanism can pivot, allowing the trimmer line to momentarily move out of the way. The advantage of this pivoting action is that the line is less apt to break due to impacting an immovable object. The centrifugal force created by the rotational spinning of the trimmer head would cause the trimmer line to rotate the line-holding assemblies such that the line is again extending radially outward. This action of the line pivoting out of the way from an immovable object and then pivoting back to a radial position occurs repetitively until the trimmer line is clear of the immovable object. 
         [0104]    Even with the advantages of the pivoting action to minimize line breakage, there is still the issue that the line will naturally wear over time from use and will need to be replaced. Removal of the used strip of trimmer line can be difficult, more so the shorter the remaining amount of line extending from exit channels  128   a  and  128   b  is. To solve this problem, the embodiment shown in  FIGS. 25-55  of the present invention comprises a trimmer head wherein the line-holding mechanism  114  comprises a spring-loaded, button activated blade  119  (see  FIG. 38 ) that allows the user a means to push the used strip of line partially out of the line-holding mechanism.  FIGS. 72-74  show this action.  FIG. 72  shows the line strip installed with the blade  119  in the up position.  FIG. 73  shows the blade in the down position. To move the blade into the downward position, the user must push button  118 , which in turn compresses spring  132  and moves blade  119  into the lower position. Then the user can release the button. Upon doing so, the spring will bias the blade back into the up position. This will leave a loop of line extending from the lower surface of the line-holding mechanism. This loop of line can then easily be pinched and pulled to remove the used strip of line. The incorporation of the spring-loaded, button activated blade in the pivoting line-holding mechanism provides the consumer with a novel product and a novel method for removing a used folded strip of trimmer line without the use of tools. 
         [0105]    Referring to  FIGS. 42-44 , blade  119  is preferably formed from a folded strip of metal. The folding action provides a nice radius  137  at the bottom of the blade for pushing against the folded strip of line. However, blade  119  could also be formed using a die casting process, or machined from metal using several commercial processes. It could also be molded of plastic. 
         [0106]    The lower end of the blade could be a blunt square tip or other shape, but the rounded lower end is preferred. Additionally, the main shaft of the blade could be constructed differently. For example, a cylindrical shape could also be used. The upper end could also be fastened to the button using other means, such as a head placed on the upper end and pressed into a cavity of the button. Insert molding could also be used to attach the button to the blade shaft. 
         [0107]    At the upper end of the blade  119  is projection  136 . To assemble the blade  119  to the button  118 , the upper end of the blade is inserted into the channel  135  (see  FIG. 41 ) of the button. The blade upper end is to be oriented such that its projection  136  will catch upon the ledge  134  once inserted. Ledge  134  (see  FIGS. 39 and 40 ) will keep the blade  119  from being removed from the button. Prior to inserting the upper end of blade  119  into the button  118 , the spring  132  must be installed into the circular slot  133  shown in  FIG. 39 . The cutaway in  FIG. 38  shows the proper placement of the spring  132  in the line-holding mechanism  114 . 
         [0108]    Referring to  FIG. 38 , the subassembly of the spring  132 , button  118  and the blade  119  are not locked into the lower housing  116 . As can be seen in  FIG. 46 , there is a passageway  138  which is open all the way through both the upper housing  117  and the lower housing  116 . To assemble the pivoting line-holding mechanism, the upper end of the blade  119  is pushed first through the opening  138  as in the lower housing  116 , then through the opening  38  in the upper housing  117  ( FIG. 45 ), then through the center of the spring  132 , and finally into the opening  135  in the button ( FIG. 41 ). The blade is pushed until the blade hook  136  catches on the ledge  134  shown in  FIG. 40 . Once the blade hook catches on ledge  134 , then the assembly cannot be taken apart. There is a stop  140  on the inside bottom of the lower housing  116  ( FIG. 47 ) which limits the upward movement of blade  119 . 
         [0109]    The bearing sleeve  115  will have a lower edge  151  ( FIG. 54 ) that will rest on a ledge  153  located on the inside of openings  124  (see  FIG. 32  for location of ledge  153 ). Referring to  FIG. 55 , the ledge  153  located on the lower layer  155  of the main housing in combination with the bearing sleeve  152  will support the downward facing surfaces of the line-holding mechanism  114 . Once the bearing is installed, then the line-holding assembly can be inserted into opening  124 . Then cover  113  is attached to the main housing  112  to retain the upper facing surfaces of the line-holding mechanism. The top of button  118  will extend through cover  113 , allowing access to the user. The six screws  120  are used to fasten the cover to the main housing. 
         [0110]    The novel design allows for a novel method for removing a used strip of folded trimmer line. The first step of the method involves the user pushing a button, which will cause a blade to push the folded portion on the trimmer line away from the lower surface of the line holding mechanism. The second step is for the user to release the button. The third step is for the user to then pinch the folded portion of line using the thumb and a finger tip. The fourth and final step is for the user to pull the line away from and out of the line holding mechanism. 
         [0111]    A third embodiment of the present invention is depicted in  FIGS. 56-69 . The third embodiment functions generally in the same manner as the previous embodiment. The main differences between the embodiments is the shape of the perimeter head and the use of a second bearing sleeve on the pivoting line-holding mechanism in the third embodiment. 
         [0112]    The shape of the third embodiment is a head  1110  with three projections or legs. Each projection contains one pivot post assembly  1114 . The pivot post assembly is also called a line-holding assembly  1114 . 
         [0113]    These pivoting line-holding assemblies are similar in design to the line-holding assemblies used in head  110  in the first embodiment. The difference is that the shape has been modified to function with two bearing sleeves  1115   a  and  1115   b.  Bearing sleeve  1115  a is mounted in the lower layer of the head  1155 . Bearing sleeve  1115   b  is mounted in the upper layer of the head  1154 . The purpose of adding a second bearing sleeve is to improve the pivoting motion (to minimize the resistance to pivoting). 
         [0114]    The components in head  1110  have been numbered the same as the components in head  110 , with the exception that all components numbers used with head  1110  have been indexed by  1100 . 
         [0115]    Other variations are within the spirit of the present invention. Thus, while the invention is susceptible to various modifications and alternative constructions, a certain illustrated embodiment thereof is shown in the drawings and has been described above in detail. It should be understood, however, that there is no intention to limit the invention to the specific form or forms disclosed, but on the contrary, the intention is to cover all modifications, alternative constructions, and equivalents falling within the spirit and scope of the invention, as defined in the appended claims. 
         [0116]    All references, including publications, patent applications, and patents, cited herein are hereby incorporated by reference to the same extent as if each reference were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein. 
         [0117]    The use of the terms “a” and “an” and “the” and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms “comprising,” “having,” “including,” and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to,”) unless otherwise noted. The term “connected” is to be construed as partly or wholly contained within, attached to, or joined together, even if there is something intervening. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein, is intended merely to better illuminate embodiments of the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention. 
         [0118]    Preferred embodiments of this invention are described herein, including the best mode known to the inventors for carrying out the invention. Variations of those preferred embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventors expect skilled artisans to employ such variations as appropriate, and the inventors intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.