A Protection Arrangement for a Power Tool

Abstract

The present disclosure relates to a hand-held power tool (1) comprising a rotatable work tool (2) with a center (16) and a circumference (17) and having a direction of rotation (19). The power tool (1) further comprises a blade guard arrangement (8) that is arranged to shield a variable part of the rotatable work tool (2) and comprises a blade guard (12) and a swiveling cover part (11, 11′, 11″) attached to the blade guard (12). In a first position, the swiveling cover part (11, 11′, 11″) is positioned such that a first arc (A) of a circle is covered, following the blade guard (12), and running an angular distance along the circumference (17) after the blade guard (12), in the direction of rotation (19). The cover part (11) is moveable between the first position and a second position where a cutting operation of the rotatable work tool (2) along the first arc (A) of a circle is allowed. The cover part (11, 11′, 11″) is biased towards the first position. The present disclosure also relates to blade guard arrangements.

1 . A hand-held power tool comprising a rotatable work tool with a center and a circumference and being adapted to rotate in a certain direction of rotation, wherein the power tool further comprises a blade guard arrangement that is arranged to shield a variable part of the rotatable work tool, wherein the blade guard arrangement comprises a blade guard and a swiveling cover part that is attached to the blade guard by means of at least one holding means comprised in the blade guard arrangement, and, in a first position, the swiveling cover part is positioned such that a first arc of a circle is covered, wherein the first arc of a circle follows the blade guard, and runs an angular distance along the circumference after the blade guard, in the direction of rotation, wherein the cover part is moveable between the first position and a second position where a cutting operation of the rotatable work tool along the first arc of a circle is allowed, wherein the cover part is biased in the direction of rotation, towards the first position by means of a biasing member, wherein the direction of rotation is a down-cut direction of rotation. 
     
     
         2 . The hand-held power tool according to  claim 1 , wherein a second arc of a circle is adjacent to the first arc of a circle and runs an angular distance along the circumference after the first arc of a circle in the direction of rotation, wherein the second arc of a circle is uncovered in the first position such that initial cutting is allowed along the second arc of a circle. 
     
     
         3 . The hand-held power tool according to  claim 1 , wherein the blade guard arrangement comprises a continuously running delimiting contact part against which a work object at least partly can rest during cutting of the work object, such that during cutting, the cover part can move between the first position and the second position by means of pressure from the work object against said contact part, the pressure working against the biasing, where the contact part either is comprised in the cover part or comprised in a part connecting the cover part to the blade guard. 
     
     
         4 . The hand-held power tool according to  claim 1 , wherein respective ends of each holding means are pivotably attached to the swiveling cover part and the blade guard, and adapted to move relative the blade guard when the cover part is moved between the first position and the second position. 
     
     
         5 . The hand-held power tool according to  claim 4 , wherein there are two holding means at the same side of the blade guard arrangement, wherein the holding means lie in a common plane parallel to a planar extension of the rotatable work tool. 
     
     
         6 . The hand-held power tool according to  claim 4 , wherein there are two holding means at the same side of the blade guard arrangement, wherein the holding means lie in different planes parallel to a planar extension of the rotatable work tool. 
     
     
         7 . The hand-held power tool according to  claim 1 , wherein the cover part is attached to the blade guard by means of at least one holding means comprised in the blade guard arrangement each holding means being in the form of a guide attached to the blade guard and being adapted to run in a corresponding arcuate slot in the cover part. 
     
     
         8 . The hand-held power tool according to  claim 1 , wherein the cover part is attached to the blade guard by means of at least one holding means comprised in the blade guard arrangement, each holding means being in the form of a pivot pin attached to the blade guard wherein the cover part is adapted to pivot around the pivot pin. 
     
     
         9 . The hand-held power tool according to  claim 1 , wherein the cover part is connected to the blade guard such that it is moveable along a path between the first position and the second position, wherein the path mainly follows the circumference such that a part of the blade guard is radially positioned between the circumference and the cover part in the second position. 
     
     
         10 . The hand-held power tool according to  claim 9 , wherein the swiveling cover part is spring-biased towards the first position along at least a part of the path, the spring bias being accomplished by means of at least one spring element that constitutes said biasing means. 
     
     
         11 . The hand-held power tool according to  claim 10 , wherein each spring element is attached to the blade guard and a corresponding holding means end and wherein the holding means end is attached to the blade guard by means of a pivot pin, the spring element being biased such that the cover part strives towards the first position along at least a part of the path. 
     
     
         12 . The hand-held power tool according to  claim 11 , wherein the spring element has a winding part and two arm parts which are attached to the blade guard and the corresponding holding means end at corresponding arm attachments, wherein a first line passing the arm attachments never passes a second line where the second line is parallel to the first line and runs via the pivot pin, such that the cover part is spring-biased towards the first position along the path. 
     
     
         13 . The hand-held power tool according to  claim 11 , wherein the spring element has a winding part and two arm parts which are attached to the blade guard and the corresponding holding means end at corresponding arm attachments, wherein a first line passing the arm attachments passes a second line when brought to the second position, wherein the second line is parallel to the first line and runs via the pivot pin, such that the cover part is spring-biased towards the second position along a part of the path. 
     
     
         14 . The hand-held power tool according to  claim 12 , wherein the winding part is adapted to move when the cover part is moved between the first position and the second position such that the force needed to move the cover part is reduced from the first position to the second position. 
     
     
         15 . The hand-held power tool according to  claim 11 , wherein the spring element comprises a spiral spring that is attached to the blade guard and the corresponding holding means end at corresponding spring attachments, wherein a first line passing the spring attachments passes a second line when brought to the second position, wherein the second line is parallel to the first line and runs via the pivot pin, such that the cover part is spring-biased towards the second position along a part of the path. 
     
     
         16 . The hand-held power tool according to  claim 1 , wherein the cover part comprises a handle that admits a user to move the cover part between the first position and the second position. 
     
     
         17 . The hand-held power tool according to  claim 1 , wherein the blade guard comprises a lock part that is adapted for releasably locking the cover part in the second position. 
     
     
         18 . The hand-held power tool according to  claim 1 , wherein the blade guard is adapted to rotate in the direction of rotation, wherein the rotation is caused by the mass of the blade guard in combination with an acceleration. 
     
     
         19 . The hand-held power tool according to  claim 18 , wherein the blade guard comprises a weight, or
 wherein the cover part at least partly is made as a see-through structure.   
     
     
         20 . The hand-held power tool according to  claim 1 , wherein the cover part comprises a wheel that is adapted to be in rotatable contact with a work object during cutting. 
     
     
         21 - 40 . (canceled)