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An apparatus and method for efficiently generating a visible line of light on a surface such as a wall or a floor for the purpose of facilitating the layout process used in construction. The apparatus comprises a light beam generator projecting a beam of visible light on a surface. Reference marking

An apparatus and method for efficiently generating a visible line of light on a surface such as a wall or a floor for the purpose of facilitating the layout process used in construction. The apparatus comprises a light beam generator projecting a beam of visible light on a surface. Reference marking elements on the instrument correspond to the light beam's position. One or more level vials may also be included for indicating vertical and horizontal, as well as a magnet for mounting and a reference bracket for a stud-finder instrument.

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An apparatus and method for efficiently generating a visible line of light on a surface such as a wall or a floor for the purpose of facilitating the layout process used in construction. The apparatus comprises a light beam generator projecting a beam of visible light on a surface. Reference marking

An apparatus and method for efficiently generating a visible line of light on a surface such as a wall or a floor for the purpose of facilitating the layout process used in construction. The apparatus comprises a light beam generator projecting a beam of visible light on a surface. Reference marking elements on the instrument correspond to the light beam's position. One or more level vials may also be included for indicating vertical and horizontal, as well as a magnet for mounting and a reference bracket for a stud-finder instrument. r, comprising a drive mechanism provided in a housing (1) and a clipper head (S) comprising a clipper comb (3) in cooperating relationship with first and second clipper blades (4, 82), said clipper head being mounted on said housing (1) for selectable pivotal motion about a pivot axis between at least first and second pivoted positions, whereby alternately one of said first and second clipper blades (4, 82) is coupled with said drive mechanism according to the selected respective pivoted position of the clipper head (S) relative the housing (1), wherein the clipper comb (3) has two rows of cutting teeth (40, 41). 11. The hair clipper as claimed in claim 10, further comprising a chassis (48) fastened to the clipper comb. 12. The hair clipper as claimed in claim 11, wherein the chassis (48) is provided with at least one locking device (9, 10) having a latching element (78, 79) movable against the pressure of a latch spring element (107). 13. The hair clipper as claimed in claim 9, further comprising at least one latching element (38, 39) for the locking device (9, 10), said latching element being disposed on the supporting element (5). 14. The hair clipper as claimed in claim 1, wherein a pivot range of the clipper head (S) is limited by stops. 15. The hair clipper as claimed in claim 14, wherein said stops are formed by cooperating wall elements (90, 92; 91, 93) formed respectively on the clipper head and on the housing (1). 16. The hair clipper as claimed in claim 1, wherein a pivot range of the clipper head (S) is determined by a detent device (RV). 17. A power driven hair clipper, comprising a drive mechanism provided in a housing (1) and a clipper head (S) comprising a clipper comb (3) in cooperating relationship with first and second clipper blades (4, 82), said clipper head being mounted on said housing (1) for selectable pivotal motion about a pivot axis between at least first and second pivoted positions, whereby alternately one of said first and second clipper blades (4, 82) is coupled with said drive mechanism according to the selected respective pivoted position of the clipper head (S) relative the housing (1), wherein a pivot range of the clipper head (S) is determined by a detent device (RV), and wherein the detent device (RV) is formed by at least one notch (102) and one detent element (101) adapted to be biased by a detent spring element (100). 18. The hair clipper as claimed in claim 17, wherein the detent spring element (100) and the detent element (101) are provided in the housing, and the notch (102) is provided on an outer wall of the clipper head. 19. The hair clipper as claimed in claim 3, wherein the clipper head (S) with the housing shell of the supporting element (5) is pivotally mounted inside a housing head shell (20) of the housing (1) on a wall of the housing head shell (20). 20. The hair clipper as claimed in claim 1, wherein the clipper head is mounted by pivot bearings to the housing, and directions of extension of a wall of the housing (1) on either side of the pivot bearings are each aligned parallel to a maximal pivot angle of the clipper head (S). 21. The hair clipper as claimed in claim 20, wherein the pivot angles of the clipper head (S) on respective sides of the pivot bearings are of equal size. 22. The hair clipper as claimed in claim 20, wherein the pivot angles of the clipper head (S) on respective sides of the pivot bearings are of different size. 23. The hair clipper as claimed in claim 11, wherein the chassis (48) is disposed on a foil (47) which is disposed on the clipper comb (3). 24. The hair clipper as claimed in claim 23, wherein at least one clipper blade (4, 82) has a row of cutting teeth (42, 43), and an end portion of said at least one clipper blade spaced from said row of cutting teeth is in sliding contact with the foil (47). 25. The hair clipper as claimed in claim 23, wherein the foil (47) has a perforation. 26. The hair clipper as claimed in claim 25, wherein the perforation defines a receptacle for a lubricant. 27. The hair clipper as claimed in claim 25, wherein the perforation is defined by holes. 28. The hair clipper as claimed in claim 23, wherein the perforation is defined by flanges. 29. The hair clipper as claimed in claim 1, wherein the pivot axis extends lateral of the housing. 30. The hair clipper as claimed in claim 29, wherein the pivot axis extends generally parallel a longitudinal extent of at least one of the clipper blades. 31. A power driven hair clipper, comprising a drive mechanism provided in a housing (1), and a clipper head (S) comprising a clipper comb (3) in cooperating relationship with first and second moving clipper blades (4, 82), wherein the clipper comb has two rows of cutting teeth along opposing edges of the comb, the first clipper blade being in cooperating relationship to a first said row of comb teeth, the second clipper blade being in cooperating relationship to a second said row of comb teeth, said clipper head being mounted on said housing (1) for selectable displacement between at least first and second operating positions, whereby in said first operating position said first clipper blade (4) is coupled with said drive mechanism and said second clipper blade is decoupled from said drive mechanism, and in said second operating position said second clipper blade (82) is coupled with said drive mechanism and said first clipper blade is decoupled from said drive mechanism. 32. The hair clipper as claimed in claim 31, wherein the clipper head is mounted on said housing for pivotal motion about a pivot axis, said first and second operating positions corresponding to first and second pivoted positions. 33. The hair clipper as claimed in claim 32, wherein the pivot axis extends lateral of the housing. 34. The hair clipper as claimed in claim 32, wherein the pivot axis extends generally parallel a longitudinal extent of at least one of said clipper blades. 35. The hair clipper as claimed in claim 31, wherein the clipper head is latchable in either of said first and second operating positions. 36. A method of engaging one of a plurality of clipper blades of a power driven hair clipper selectively by a user, comprising the steps of providing a drive mechanism in a housing, and a clipper head comprising a clipper comb in cooperating relationship with first and second moving clipper blades, providing at least two rows of teeth on said clipper comb, said first row of comb teeth being in cooperating engagement with said first clipper blade and said second row of comb teeth being in cooperating engagement with said second clipper blade, mounting said clipper head for displacement on said housing, moving said clipper head relative the housing to a first operating position, coupling, in said first operating position, said first clipper blade with said drive mechanism and decoupling said second clipper blade from said drive mechanism, and then moving said clipper head relative the housing to a second operating position, decoupling, in said second operating position, said first clipper blade from said drive mechanism and coupling said second clipper blade with said drive mechanism, whereby a user can selectively choose said first and second operating positions. 37. The method of claim 36, wherein the clipper head is mounted on said housing for pivotal motion about a pivot axis, said first and second operating positions corresponding to first and second pivoted positions. 38. The method of claim 37, wherein the pivot axis extends lateral of the housing. 39. The method of claim 37, wherein the pivot axis extends generally parallel a longitudinal extent of at least one of said clipper blades. 40. The method of claim 36, further comprising the step of latching the the clipper head in either of said first and second operating positions. 41. The hair clipper as claimed in claim 17, wherein the detent spring element (100) and the detent element (