Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
  • B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
  • B23D47/12—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts of drives for circular saw blades
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28D—WORKING STONE OR STONE-LIKE MATERIALS
  • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
  • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
  • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
  • B28D1/045—Sawing grooves in walls; sawing stones from rocks; sawing machines movable on the stones to be cut
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H7/00—Gearings for conveying rotary motion by endless flexible members
  • F16H7/08—Means for varying tension of belts, ropes, or chains
  • F16H7/0827—Means for varying tension of belts, ropes, or chains for disconnecting the drive
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H7/00—Gearings for conveying rotary motion by endless flexible members
  • F16H7/08—Means for varying tension of belts, ropes, or chains
  • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
  • F16H7/14—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of a driving or driven pulley

Definitions

• the present invention generally relates to belt drives and, in particular,
• pavement saw belt drives that are capable of being disengaged.
• a pavement saw is a device used to cut through a slab of pavement and/or
• pavement saw used to cut grooves/slots within pavement surfaces.
• One type of pavement saw is a
• a typical pavement saw used to cut concrete surfaces.
• a typical pavement saw has a
• the pavement saw typically rests directly upon the pavement
• the saw blade is configured to descend into the cut location
• the saw blade first must be retracted (raised out of) from the cut. After retraction, the exposed, spinning blade presents considerable danger to the saw
• disengageable belt drive may
• a belt encircles a moveable drive pulley and a fixed driven
• the circumference of the belt is chosen so that when the drive pulley is in a
• the belt is taut about the drive pulley and the driven pulley, and when
• the shroud is positioned so that when the belt is not
• FIG. 1 is a side view of a first embodiment of the invention, showing the
• Fig. 2. is a partial, perspective detail view of a second embodiment of the
• FIG. 3 is a partial, side view of a third embodiment of the invention.
• Fig. 4 is a partial, second side view of the embodiment of Fig. 3 showing
• Fig. 5 is a first side view of a fourth embodiment of the present invention.
• Fig. 6 is a second side view of the embodiment of Fig. 5, showing the belt
• Fig. 7 is a partial side view of a fifth embodiment of the present invention.
• FIG. 1, 3 - 7 presents side views of various embodiments of the present
• FIG. 2 showing a close-up (partial
• FIG. 1 A first embodiment is shown in Fig. 1. Referring to Fig. 1, a representative
• pavement saw 10 (presented in a simple form) has a frame 12 that supports the components of the pavement saw.
• a pivot mount 14 is rigidly attached to the frame
• a power source/motor/engine 16 is attached to pivot mount 14 so that engine 16
• portions are moved/pivoted relative to the engine portion, among other ways.
• This embodiment's preferred actuator 18 being a hydraulic cylinder.
• actuator 18 essentially working as a tension controller, controlling the tension of the
• engine 16 drives a first (drive) pulley 20, which in
• saw blade 26 The locations of second pulley 24 and saw blade 26 are preferably
• first pulley 20 generally fixed relative to frame 12, whereas the location of the first pulley 20 is not.
• the first pulley 20 able to move (pivot, slide, rotate, etc.) closer to and/or further
• a braking surface or "shroud" 28 is preferably provided which extends
• adjustable brake shoes 199 It is further preferred that at least a portion of the
• braking surface extend preferably in a plane generally perpendicular to a reference
• shroud 28 is shown in Fig. 2.
• Shroud 28 need not be perfectly symmetric about
• FIGs. 3 and 5 show the disengagement of the belt drive, whereas Figs. 1, 4,
• pulley 20 away from pulley 24 until belt 22 is taut there between.
• actuator 18 is extended to disengage the belt drive
• pulley 20 is in a position free of belt tension, the tension of belt 22 is relaxed and
• centrifugal force drives belt 22 outward where it engages and contacts the inner
• pulley 20 and/or pulley 24 are examples of pulley 20 and/or pulley 24.
• the actuator is a hydraulic cylinder.
• the belt drive is engaged by retracting
• FIG. 5 Yet another embodiment is shown in Figs. 5 and 6. Referring to Fig. 5, a
• representative pavement saw 10 has a frame 12 that supports the components of the
• the clutch function is controlled through use of a belt tensioner 50.
• This belt tensioner comprising a pair of spaced idler pulleys, namely a first idler
• This belt tensioner 50 configured for rotation
• the belt 22 has slack and thus the continual rotation of the drive pulley
• drive pulley drives the driven pulley and its attached saw blade.
• the tension controller 50 comprising a pair of spaced pulleys
• the tension controller 50 configured for rotation in a first direction whereby the spaced pulleys (51, 52) can both engage
• the tension controller 50 controls the tension of the belt 22 thereby tensioning the belt 22.
• the drive pulley 20 need not be directly driven by the engine. In an
• the engine drives the dr,ive pulley through a transmission
• the engine may or may not
• the actuator is connected to the transmission, and rotates the
• this embodiment utilizes at least one adjustable brake shoe 199.
• Fig. 7 this embodiment utilizes at least one adjustable brake shoe 199.
• the brake shoes 199 contact and stop the
• shoes opposing one another on each side of the belt are used. These shoes are adjustable so that if different size pulley configurations are used (for different blade

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Mining & Mineral Resources (AREA)
• Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Cites Families (5)

• 2006
  • 2006-01-26 EP EP06719859A patent/EP1943438A1/de not_active Withdrawn
  • 2006-01-26 CN CNA2006800409515A patent/CN101300437A/zh active Pending
  • 2006-01-26 WO PCT/US2006/003196 patent/WO2007053168A1/en active Application Filing

Non-Patent Citations (1)

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