US3358837A - Bar screen cleaning device - Google Patents

Bar screen cleaning device Download PDF

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Publication number
US3358837A
US3358837A US500757A US50075765A US3358837A US 3358837 A US3358837 A US 3358837A US 500757 A US500757 A US 500757A US 50075765 A US50075765 A US 50075765A US 3358837 A US3358837 A US 3358837A
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US
United States
Prior art keywords
rake
screen
assembly
track
guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US500757A
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English (en)
Inventor
Thomas J Tillett
Auerbach Bedrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Link Belt Co
Original Assignee
Link Belt Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Link Belt Co filed Critical Link Belt Co
Priority to US500757A priority Critical patent/US3358837A/en
Priority to JP41069306A priority patent/JPS4832463B1/ja
Application granted granted Critical
Publication of US3358837A publication Critical patent/US3358837A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
    • E02B8/02—Sediment base gates; Sand sluices; Structures for retaining arresting waterborne material
    • E02B8/023—Arresting devices for waterborne materials
    • E02B8/026—Cleaning devices

Definitions

  • an object of the present invention to provide an improved bar screen cleaning device automatically movable along a guide track which is curved at the upper portion thereof to overlie a discharge outlet in order to achieve effective dumping of the debris collected by the cleaning device.
  • Another object of the invention is to provide such a screen cleaning device having a raking assembly movable along a guide track which is held between each debris collecting operation in an at rest open position and automatically started on its descending movement along the curved portion of the guide track by spring biased pusher arms.
  • a further object of the invention is to provide an improved screen cleaning device having cooperating guide and pin means for maintaining a cleaning rake in a closed position until it is properyl disposed above the discharge outlet and means are provided to return the cleaning rake to an at rest open position.
  • a still further object of the invention is to provide such a screen cleaning device employing automatically releasable latch arms for maintaining the raking assembly in position over the discharge outlet at the end of the curved portion of the guide track while the rake is moving to an at rest open position for the next debris cleaning operation.
  • Still another object of the invention is to provide an improved screen cleaning device employing limit switches for automatically controlling the movement of the raking assembly along the guide track during the screen cleaning operation.
  • a further object of the invention is to provide an improved screen cleaning device which is relatively simple and economical in construction.
  • the invention relates to a screen cleaning device for use in combination with a debris and refuse collecting bar screen
  • a guide track adjacent to the screen, said track having a generally straight lower portion and a curved upper portion extending over a discharge point
  • a rake assembly movable along said track assembly including a rake pivotable into and out of engagement with the screen, means for moving said rake assembly along said track and across said screen, pin means mounted adjacent the curved portion of said track, guide means mounted on said rake engageable with said pin means to prevent said rake from pivoting to an open position until it is positioned over the discharge point, latch means for holding said assembly while said rake is moving to an at rest open position, and pusher means adjacent the curved portion of said track engageable with said rake assembly to initiate descending movement of said rake assembly along the curved portion of said track towards the lower portion thereof.
  • FIGURE 1 is a vertical sectional view of a screen cleaning device according to the invention showing the rake in open position during its descending movement along the guide track.
  • FIGURE 2 is a rear sectional view of the screen cleaning device taken along line 2-2 of FIGURE 1.
  • FIGURE 3 is a vertical sectional view of the screen cleaning device showing the cable in slack position and the rake pivoting to closed position at the bottom end of the guide track.
  • FIGURE 4 is a vertical sectional view of the screen cleaning device showing the rake in closed position during its ascending movement along the guide track.
  • FIGURE 5 is a vertical sectional view of a portion of the screen cleaning device showing the raking assembly as it initially contacts the pusher arms with the rake still in closed position just prior to reaching the discharge point for collected debris.
  • FIGURE 6 is a view similar to FIGURE 5 showing the raking assembly in contact with the pusher arms and the rake in contact with the wiper over the discharge point for collected debris.
  • FIGURE 7 is a view similar to FIGURE 5 showing the raking assembly in its upper end limit position over the discharge point along the guide track with the rake pivoting toward open position and the latch bars holding the raking assembly in place at the top of the track during this pivoting to open position.
  • FIGURE 8 is a view similar to FIGURE 5 showing the raking assembly in its at rest open position in readiness for start of its descending movement down the guide track and
  • FIGURE 9 is an enlarged detail perspective view of a portion of the raking assembly.
  • a suitable screen such as bar screen 12, comprised of a plurality of equally spaced parallel bars 13, for catching debris or refuse in the flowing stream 10 of liquid.
  • the screen cleaning device generally comprises a pair of spaced generally channel shaped guide tracks for guiding the raking assembly 16 along a predetermined path to effect cleaning of the screen and dumping of the refuse so collected into a discharge outlet 17 adjacent the top of housing 14.
  • Each of the tracks 15 is comprised of a straight lower portion 18 generally parallel to the inclined screen 12 and a curved upper portion 19.
  • the tracks 15 are curved rearwardly towards the horizontal at their upper end so that the raking assembly may be effectively carried up and over discharge point 17 in order to properly discharge refuse collected from the screen 12.
  • An adjustable stop member 20 is provided at the bottom of each of the guide tracks 15 for stopping raking assembly 16 when it reaches the bottom of the tracks.
  • the raking assembly 16 includes a carriage comprised of a pair of sliding blocks 21 adapted for sliding movement within the channels formed by the tracks 15.
  • Each of the blocks 21 is provided with a cover or extension 22 on the inside of the upper end thereof as best shown in FIGURE 9.
  • Rake member 24 Pivotally attached to the upper portion of each sliding block 21 underneath the extension 22 at pivot pin 23 is a rake member 24.
  • Rake member 24 is comprised of a pair of side arms 25 connected by a transverse bar 26 having a plurality of equally spaced teeth 27 as best seen in FIGURE 2.
  • the raking teeth 27 are adapted to mesh with the openings between the spaced bars 13 of inclined screen 12 to effect cleaning of the screen as the rake is drawn upwardly across the screen in a so-called closed position.
  • a curved guide bar 28 Disposed on the outer side of each of the side arms 25 of rake member 24 is a curved guide bar 28, the purpose of which will be discussed more fully hereinafter.
  • the raking assembly 16 is moved along the guide tracks 15 by means of cables 31 wound upon a pair of power driven drums 32.
  • the cables 31 are attached to the raking end of rake member 24 by being connected to the transverse bar 26 at spaced points along the length of bar 26 and inwardly of side members 25.
  • the cable drums 32 are mounted on a shaft 33 situated adjacent the top of housing 14.
  • Motor 34 is operatively connected to shaft 33 by suitable drive means such as chain 35 extending around a sprocket 36 mounted on shaft 33.
  • a wiper blade 37 extends between and is attached to the sides of housing 14 at a point above the discharge outlet 17 and below the rearwardly curved portions 19 of tracks 15. Wiper blade 37 functions to clean the rake teeth 27 of rake member 24 to discharge debris into the discharge outlet 17.
  • a pair of spring :biased pusher arms 38 Pivotally attached to the sides of housing 14 at points between the upper curved portions 19 of tracks 15 and discharge outlet 17 are a pair of spring :biased pusher arms 38.
  • the pusher arms 38 are biased to pivot downwardly by a pair of tension springs 39 attached to the pusher arms and the sides of the housing 14.
  • the pusher arms 38 function to initiate descending movement of the raking assembly 16 along the curved portions of the tracks 15 at the start of each screen cleaning operation.
  • a pair of latch bars 41 are pivotally attached to the sides of housing 14 above the guide tracks 15 adjacent the top of the housing.
  • One of the latch bars 41 is provided with an upwardly extending bar 42 which is adapted to contact and actuate a limit switch 43 mounted on theside of the housing just above the latch bar.
  • the actuation of limit switch 43 stops motor 34, terminating winding on cable drums 32 of cables 31 at the end of each screen cleaning operation leaving the rake assembly in an at rest position ready for the next cleaning operation.
  • switch 43 may be connected to recycle the cleaning device by reversing the direction of motor 34, starting unwinding of cable from drums 32 and permitting the raking assembly 16 to descend to the :bottom of the guide tracks 15.
  • next screen cleaning operation may be initiated by a manual pushbutton or a timer adjusted for periods of 3 to 120 minutes between cycles. With either the pushbut- 4 ton or timer the device will be restarted to unwind cable and lower the raking assembly 16.
  • a slack cable limit switch assembly 44 having an arm in contact with one of the cables 31.
  • Limit switch assembly 44 operates to reverse the motor 34 upon slackening of the cables 31 which occurs as the raking assembly 16 comes in contact With the stops 20 at the bottom of guide tracks 15.
  • a pair of pins 45 are mounted on the sides of housing 14 immediately below the curved portions of guide tracks 15. Pins 45 are positioned approximately midway of the curved portions of guide tracks 15. As best illustrated in FIGURES 5 and 6, the pins 45 engage with guide bars 28 on the side arms 25 of rake member 24 as raking assembly 16 ascends to effectively prevent the rake member 24- from pivoting to its open position until it is properly disposed over discharge outlet 17 and has discharged any refuse collected from bar screen 12.
  • the raking assembly 16 initially is at a point near the upper end of guide tracks 15 with the rake member 24 in its at rest open position as shown in FIGURE 8. In this position the spring biased pusher arms 38 press against the cover portions 22 of sliding blocks 21 and the wire cables 31 restrain the raking assembly from descending down the guide tracks 15.
  • the rake member 24 is holding latch bars 41 up to keep switch 43 closed in the deenergized condition for the equipment.
  • the cable drums 32 are rotated to cause the cables 31 to unwind and permit the raking assembly 16 to descend down the guide tracks 15. Start of the raking assembly along the curved portions 19 of tracks 15 is initiated by the action of the spring biased pusher arms 38.
  • the raking assembly After the raking assembly moves around the more nearly horizontal segments of curved portions 19, it contmues its descent down the steeply inclined straight portion of the track guides 15 by gravity. During this downward descent, the cable connections to the rake member 24 are in front of the rake pivot points 23 relative to the position of winding drums 32 as shown in FIGURE 1, thus causing the rake tobe held pivoted in an open position by the tension on cables 31.
  • the slacking of cables 31 also operates slack cable limit switch assembly 44 thus causing the motor 34 to reverse and commence winding cables 31 back onto the drums 32. This pulls the rake member 24 against and up the bar screen 12 with teeth 27 passing between the screen bars 13 to eifect cleaning of any debris or refuse collected by the screen.
  • the extensions 22 of the sliding blocks 21 contact the pusher arms 38 (see FIGURE 5) and extends them against the force of the tension springs 39. Thereby the pusher arms are moved to their loaded position in readiness to assist initial movement of the raking assembly 16 in starting its next cleaning operation.
  • the pivot points 23 of rake member 24 shift to be disposed forwardly of the path of cables 31 (see FIGURE 6) so that the pull of the cables tends to pivot the rake member to the open position.
  • the guide bars 28 on side arms 25 of rake member 24 contact pins 45.
  • latch bars 41 drop down to engage the ends of slide blocks 21 and hold the raking assembly 16 at its upper limit position (see FIGURE 7).
  • the latch bars 41 serve to hold the raking assembly 16 at its upper limit position until the rake member 24, having cleared the pins 45, under the tension of cables 31 pivots back to its open position.
  • the rake member 24 pushes up the latch bars 41 to release the raking assembly -16 for descending movement.
  • limit switch 43 is actuated by stop 42 on one of the latch bars to either recycle or shut oil? the machine.
  • the screen cleaning device of the present invention aflFords many advantages over other prior art screen cleaning devices.
  • the curved upper portion of the guide tracks permits the rake to be efiectively positioned over the discharge outlet for effective disposal of any debris or refuse collected by the rake from the screen.
  • the cooperating pins and guide bars effectively prevent the rake from swinging to open position until it is properly disposed to discharge the refuse through the discharge outlet.
  • the spring biased pusher arms 38 also provide effective means of initiating descending movement of the raking assembly around the curved portion of the guide tracks.
  • the pins, guide bars, spring biased pusher arms, and latch bars effectively cooperate to permit utilization of the curved guide tracks in order to achieve an etfective dumping or discharge of debris collected by the rake.
  • the connecting of the cables at the raking end of the rake member, in conjunction with the curved and inclined guide tracks, permits the pivot points of the rake to be shifted forwardly and backwardly of the cables so that the rake is held in open position during descending movement and in closed position during ascending movement.
  • a screen cleaning device for use in combination with a screen to catch debris or refuse in a flowing liquid stream comprising:
  • guide track means adjacent to the screen to be cleaned having a generally straight lower portion and a curved upper portion extending over a discharge point
  • a rake assembly movable along said track means including a rake member pivotable into and out of engagement with the screen
  • latch means operable to retain said rake assembly against said pusher means incident discharge of debris from said rake member and movement of said rake member to an at rest open position in readiness to start another screen cleaning operation.
  • a screen cleaning device for use in combination with a screen to catch debris or refuse in a flowing liquid stream comprising:
  • guide track means adjacent to the screen to be cleaned having a generally straight lower portion and a curved upper portion extending over a refuse discharge point
  • a rake assembly movable along said track means including a rake member pivotable between an open position out of engagement with the screen and a closed position to cleaningly cooperate with the screen,
  • latch means operable to retain said rake assembly incident pivotal movement of said rake member from said closed position to an at rest open position in readiness to start another screen cleaning operation.
  • a screen cleaning device for use in combination with a screen to catch debris or refuse in a flowing liquid stream comprising:
  • guide track means adjacent to the screen to be cleaned having a generally straight lower portion and a curved upper portion extending over a discharge point
  • a rake assembly movable along said track means including a rake member pivotable between an open position out of engagement with the screen and a closed position to cleaningly cooperate with the screen,
  • latch means operable to retain said rake assembly against said pusher means incident discharge of debris from said rake member and pivotal movement of said rake member from said closed position to an at rest position in readiness to start another screen cleaning operation.
  • a screen cleaning device for use in combination with a bar screen to catch debris or refuse in a flowing liquid stream comprising:
  • a guide track adjacent to the screen having a generally straight lower portion and a curved lower portion extending over a discharge point
  • a rake assembly movable along said track including a rake member pivotable into and out of engagement with the screen
  • a pair of power operated cables connected to said rake member for moving said rake assembly along said track and across the screen, said cables being connected to the raking end of said rake member to hold said rake member out of engagement with the screen during descending movement of said raking assembly and to maintain said rake member in sliding engagement with the screen during ascending movement of said raking assembly,
  • latch means adjacent the curved portion of said track engageable with said rake assembly to hold said assembly in position over the discharge point at the end of the curved portion of said track during pivotal movement of said rake member to said open position
  • a screen cleaning device for use in combination with a bar screen to catch debris or refuse in a flowing liquid stream comprising:
  • a guide track adjacent to the screen having a generally straight lower portion and a curved upper portion extending over a discharge point
  • a rake assembly movable along said track including a rake member pivotable into and out of engagement with the screen
  • a pair of power operated cables connected to said rake member for moving said rake assembly along said tracks and across said screen, said cables being connected to the raking end of said rake member to hold said rake member out of engagement with said screen during descending movement of said raking assembly and to maintain said rake member in sliding engagement with said screen during ascending movement of said raking assembly,

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Filtration Of Liquid (AREA)
US500757A 1965-10-22 1965-10-22 Bar screen cleaning device Expired - Lifetime US3358837A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US500757A US3358837A (en) 1965-10-22 1965-10-22 Bar screen cleaning device
JP41069306A JPS4832463B1 (enrdf_load_stackoverflow) 1965-10-22 1966-10-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US500757A US3358837A (en) 1965-10-22 1965-10-22 Bar screen cleaning device

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US3358837A true US3358837A (en) 1967-12-19

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US500757A Expired - Lifetime US3358837A (en) 1965-10-22 1965-10-22 Bar screen cleaning device

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JP (1) JPS4832463B1 (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3482698A (en) * 1967-03-28 1969-12-09 Tolu Ab Arrangement for cleaning gratings,grids,racks,etc.
US3591006A (en) * 1967-10-06 1971-07-06 H Geiger Maschf Rake cleaning tool
FR2076396A5 (enrdf_load_stackoverflow) * 1970-01-14 1971-10-15 Beaudrey & Cie
US4138334A (en) * 1975-12-11 1979-02-06 Mecafina S.A. Trash collector
US4289619A (en) * 1980-08-11 1981-09-15 Sampson Milo J Material handling apparatus
US4725366A (en) * 1986-04-21 1988-02-16 Dresser Industries, Inc. Rake movement speed control
US4725365A (en) * 1986-04-21 1988-02-16 Dresser Industries, Inc. Bar screen raking apparatus and method of use
US20220023779A1 (en) * 2020-07-23 2022-01-27 Parkson Corporation Bar screen filter apparatus and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1392647A (en) * 1920-12-09 1921-10-04 Ira W Jones Rack-cleaning device
US1823823A (en) * 1929-03-05 1931-09-15 William A Dundas Rack screen cleaner
US1984891A (en) * 1931-06-18 1934-12-18 Link Belt Co Screen
US2186790A (en) * 1940-01-09 smyser
US3152075A (en) * 1960-06-29 1964-10-06 Allis Chalmers Mfg Co Trash retainer for movable trash rake

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2186790A (en) * 1940-01-09 smyser
US1392647A (en) * 1920-12-09 1921-10-04 Ira W Jones Rack-cleaning device
US1823823A (en) * 1929-03-05 1931-09-15 William A Dundas Rack screen cleaner
US1984891A (en) * 1931-06-18 1934-12-18 Link Belt Co Screen
US3152075A (en) * 1960-06-29 1964-10-06 Allis Chalmers Mfg Co Trash retainer for movable trash rake

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3482698A (en) * 1967-03-28 1969-12-09 Tolu Ab Arrangement for cleaning gratings,grids,racks,etc.
US3591006A (en) * 1967-10-06 1971-07-06 H Geiger Maschf Rake cleaning tool
FR2076396A5 (enrdf_load_stackoverflow) * 1970-01-14 1971-10-15 Beaudrey & Cie
US4138334A (en) * 1975-12-11 1979-02-06 Mecafina S.A. Trash collector
US4289619A (en) * 1980-08-11 1981-09-15 Sampson Milo J Material handling apparatus
US4725366A (en) * 1986-04-21 1988-02-16 Dresser Industries, Inc. Rake movement speed control
US4725365A (en) * 1986-04-21 1988-02-16 Dresser Industries, Inc. Bar screen raking apparatus and method of use
US20220023779A1 (en) * 2020-07-23 2022-01-27 Parkson Corporation Bar screen filter apparatus and method
US11633680B2 (en) * 2020-07-23 2023-04-25 Parkson Corporation Bar screen filter apparatus and method

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Publication number Publication date
JPS4832463B1 (enrdf_load_stackoverflow) 1973-10-06

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