초록

A power sanding machine (10) has three circumferentially spaced cogged belts (40) that are under tension via bearings (36) to drive three discs (52). A grounded vacuum (16) with a metal canister (74) is mounted on the operating handle (14).

대표청구항 ▼

A power sanding machine (10) has three circumferentially spaced cogged belts (40) that are under tension via bearings (36) to drive three discs (52). A grounded vacuum (16) with a metal canister (74) is mounted on the operating handle (14). rted by a guide (33) provided on the rear surface of the ma

A power sanding machine (10) has three circumferentially spaced cogged belts (40) that are under tension via bearings (36) to drive three discs (52). A grounded vacuum (16) with a metal canister (74) is mounted on the operating handle (14). rted by a guide (33) provided on the rear surface of the main screed (7) so as to freely move in the direction of width of pavement along a surface nearly the same as the rear surface of the main screed (7), thereby to adjust the height of the lower end of the extensible molding board (32), so that composite material is placed in an amount required for the pavement in front of the rear one of said pair of extensible screeds (15). 5. A screed device in a road-paving vehicle according to claim 1, wherein extensible molding boards (36, 37) coupled at their ends on one side to side arms (34, 35) extending forward in the direction of progress from the outer ends of the front and rear ones of said pair of extensible screeds (15,16), are supported by a pair of guides (38, 39) provided on the front surface of the main screed (7) so as to freely move in the direction of width of pavement along a surface nearly the same as the front surface of the main screed (7), thereby to adjust the heights of the lower ends of the extensible molding boards (36, 37), so that composite materials are placed in amounts required for the pavement in front of the front and rear ones of said pair of extensible screeds (15, 16). 6. A screed device in a road-paving vehicle according to claim 1, wherein one or more pairs of extension screeds (11) are provided at the back or in front of said pair of extensible screeds (15, 16), and are moved by the extending devices such as hydraulic cylinders in the directions of width of pavement but opposite to each other from the rear positions or front positions of said pair of extensible screeds (15, 16). 7. A screed device in a road-paving vehicle according to claim 1, wherein extension screeds (12) are attached to the outer ends of front and rear ones of said pair of extensible screeds (25, 16) to further extend the range. 8. A screed device for use with a road-paving vehicle comprising: a main screed having a main length and a first and second end; a first screed support provided on the first end of said main screed; a second screed support provided on the second end of said main screed; a first extension support supported by said first screed support, said first extension support allowed to move in the direction of the main length of said main screed a first screed support distance; a second extension support supported by said second screed support, said second extension support allowed to move in the direction of the main length of said main screed a second screed support distance; a first screed having a first length supported by said first extension support and positioned rearward of said main screed, said first screed allowed to move in the direction of the main length of said main screed a first extension support distance, the first length of said first screed being substantially equal to the main length of said main screed; a second screed having a second length supported by said second extension support and positioned rearward of said first screed, said second screed allowed to move in the direction of the main length of said main screed a second extension support distance, the second length of said second screed being substantially equal to the main length of said main screed; and an extending device coupled to said first and second screed moving said first and second screed in the direction of the main length, whereby the screed device is capable of being rigidly extended to an extended pavement width. 9. A screed device for use with a road-paving vehicle as in claim 8 further comprising: a hoist coupled to said first and second screed supports, whereby said first and second screeds are capable of being moved up and down relative to said main screed. 10. A screed device for use with a road-paving vehicle as in claim 8 wherein: said first and second screeds comprise an upper frame and a lower frame, wherein the lower frame is capable of being moved up and down relative to the upper frame.