With Means To Guard The Tension Patents (Class 83/814)
  • Publication number: 20140305273
    Abstract: A device for deflecting a detached cutting chain off the drive sprocket of a chain saw in order to deenergize and arrest it. A ramp provides a surface disposed below the chain guide bar, which surface is oblique with respect to the chain guide bar, slightly below a lower edge of the chain guide bar and obliquely angled with respect to a plane that contains the exterior surface of the chain guide bar, and distal to the drive sprocket. Sliding engagement of a detached cutting chain with the oblique surface moves the cutting chain exteriorly away from the chain guide bar and off the drive sprocket. A chain catcher is also provided to arrest the detached cutting chain and/or chain shot portions thereof.
    Type: Application
    Filed: April 9, 2014
    Publication date: October 16, 2014
    Inventor: Kenneth J. Thomsen
  • Patent number: 8776658
    Abstract: A band saw comprises a band saw blade that is moved along a running direction against which a sawing material is guided in a feed direction. The band saw further includes a guide mechanism for the band saw blade comprising a plurality of magnet guide elements that are adjustable in their force for exerting a force on the band saw blade to influence its position in space. The magnet guide elements are positioned upstream and downstream of the sawing material and have at least two magnets one beside the other, as viewed along the running direction.
    Type: Grant
    Filed: June 8, 2011
    Date of Patent: July 15, 2014
    Assignee: Gebrueder Linck Maschinenfabrik “Gatterlinck” GmbH & Co. KG
    Inventors: Joachim Rudolph, Stephan Eckhardt
  • Publication number: 20140116225
    Abstract: Arrangement in order to tension a counter element (1), such as a blade of a sawing device, such as a blade (15) of a band sawing machine in combination with a roll or a slide block to a chosen sawing line with the help of the mentioned counter element and in order to direct the counter element to make it stay at the mentioned line. The arrangement comprises a magnetic device (14) in order to improve the functioning belonging to the counter element (1) and in order to improve the sawing result with the help of which magnetic force created by the magnetic device the blade (15) is being controlled with a force which has the same direction which force pushes the blade (15) against the counter element (1).
    Type: Application
    Filed: July 8, 2011
    Publication date: May 1, 2014
    Inventor: Reijo Viljanen
  • Patent number: 8549761
    Abstract: In a chain saw, the tension of a saw chain attached around the outer edge of a guiding bar can be adjusted appropriately by adjusting the force transmitted to a connecting unit during operation of a hand guard. Thus, the saw chain 6 can be easily strained at great tension without use of a strong coil spring.
    Type: Grant
    Filed: January 27, 2011
    Date of Patent: October 8, 2013
    Assignee: Maruyama Mfg. Co. Inc.
    Inventors: Minoru Araki, Toshihisa Nemoto, Katsutoshi Inagaki, Eiji Matsuoka
  • Patent number: 8413563
    Abstract: A height adjustment device for a band saw includes a manual driving unit and an automatic driving unit. When one of the manual driving unit and the automatic driving unit is damaged, the user can operate the other to adjust the height where a saw blade guiding device is located, thereby ensuring a smooth running of the production line and improving the production efficiency.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: April 9, 2013
    Inventor: Chun-Jung Chen
  • Patent number: 8402873
    Abstract: A pallet dismantler includes a frame, a first drive roller rotatably coupled to the frame, and an arm pivotably coupled to the frame. A sleeve member is rigidly coupled to the arm. An axle extends from the sleeve. A second drive roller is rotatably coupled to the axle. An adjustable ratchet member extends between the arm and the frame. The adjustable ratchet member is operable to adjust the position of the second driver roller relative to the first drive roller. A blade member is trained on the first and second drive rollers.
    Type: Grant
    Filed: December 15, 2009
    Date of Patent: March 26, 2013
    Inventor: Ambrose Bedel
  • Publication number: 20120247288
    Abstract: A soil pipe cutting tool is described. The tool includes a telescoping housing assembly, a feedscrew in threaded engagement with the housing assembly, and a cutting chain. The cutting tool can be powered by an impact driver. Also described are rotary powered tools. In certain versions, the tools include torque limiting provisions to prevent transfer of excessively high levels of torque to a working end of the tool. Various methods of use are also described.
    Type: Application
    Filed: March 27, 2012
    Publication date: October 4, 2012
    Applicant: EMERSON ELECTRIC CO.
    Inventors: James E. Hamm, Kyle Davison
  • Publication number: 20120042759
    Abstract: A cutting tool is described. The tool engages with a standard press tool and is used for cutting brittle pipe such as cast iron soil pipe. The tool features a cutting chain assembly that is tensioned about the pipe by a pair of pivotally moveable arms.
    Type: Application
    Filed: August 18, 2010
    Publication date: February 23, 2012
    Applicant: EMERSON ELECTRIC CO.
    Inventor: Brian A. Mitchell
  • Publication number: 20110000355
    Abstract: A multi-bandsaw machine includes several bandsaws, for cutting a material into a plurality of plates in a single process. At least one side edge of each bandsaw has a plurality of diamond grits, and the bandsaws rotate in a single direction on the multi-bandsaw machine, so as to cut the material with the diamond grits and form a cutting notch on the material. The cutting notch has a depth to kerf ratio at least larger than 100:1 during the process of cutting the material with the diamond grits in each hour.
    Type: Application
    Filed: July 1, 2009
    Publication date: January 6, 2011
    Applicant: KINIK COMPANY
    Inventor: Shin Cheng Lin
  • Publication number: 20100293797
    Abstract: A chainsaw has a cam lever and cam assembly that can be used to adjust the tension of a guide bar in the chainsaw. Once the tension of the guide bar has been lessened, the guide bar can be moved back and forth by using a chain-tightening knob and tightening mechanism. The movement of the guide bar causes the chain to tighten or loosen on the guide bar.
    Type: Application
    Filed: June 22, 2010
    Publication date: November 25, 2010
    Applicant: MTD Products Inc.
    Inventors: David B. Fisher, Todd J. Ford
  • Patent number: 7789004
    Abstract: A band saw machine includes a machine frame unit with a longitudinal guideway, a cam follower movable along the guideway, a wheel mount movable with the cam follower between closer and remote positions relative to a first wheel mounted on the machine frame unit, a biasing member disposed to bias the wheel mount to the remote position, a second wheel mounted on the wheel mount, a band saw blade trained on the wheels, and an actuating shaft with a cam end which engages the cam follower. The wheel mount can be kept in the closer position with a friction force that counteracts the biasing force of the biasing member by turning the actuating shaft so as to permit replacement of the band saw blade.
    Type: Grant
    Filed: September 10, 2007
    Date of Patent: September 7, 2010
    Inventor: Hui-Chuan Liao
  • Publication number: 20100071527
    Abstract: A band saw machine which has an endless band saw blade hung around a driving wheel and a driven wheel rotatably supported by a saw blade housing that is capable of moving vertically. The band saw machine also includes a pair of guide posts for vertically guiding the saw blade housing between the driving wheel and the driven wheel, wherein an upper traveling part of the band saw blade is disposed at one side of the front and rear sides of the guide posts, and a lower traveling part of the band saw blade is disposed at the other side of the front and rear sides of the guide posts.
    Type: Application
    Filed: November 18, 2009
    Publication date: March 25, 2010
    Applicant: AMADA COMPANY, LIMITED
    Inventors: Shoji AIHARA, Minoru GOTOH, Fumiaki NEMOTO, Akio SETO
  • Publication number: 20090119934
    Abstract: The invention relates to an auto tensioner of a chain saw. A spiral guide groove (16) of the disk (15) engages with a protrusion 10a of a slider piece (10) and the slider piece (10) is slidably stored in a guide portion (9) formed in a chain cover (2) via a spring (14). A tensioner (11) comprising a protrusion (11) engaged with a guide bar is slidably stored in the slider piece 10 via a coin spring (12). The protrusion (10a) contacts an outer circumference face of the spiral guide groove 16 on a diameter passing through a rotating center of the disk, and an unshown nut for engaging with a stud bold 6 provided on an engine cover side is attached on the rotating center of the disk (15). A rotation of the disk enables to fix the chain cover (2) and move the guide bar.
    Type: Application
    Filed: January 9, 2009
    Publication date: May 14, 2009
    Applicant: HUSQVARNA ZENOAH CO., LTD.
    Inventor: Yuu Sugishita
  • Patent number: 7481000
    Abstract: A bar adjustment assembly for a chain saw includes a shaft, a bar adjustment pin that is journalled for rotation relative to the shaft, and a pin alignment spring that biases the pin toward an engagement position. A void is provided for accommodating the pin as it is rotated away from the engagement position by a guide bar that has been incorrectly attached.
    Type: Grant
    Filed: January 10, 2005
    Date of Patent: January 27, 2009
    Assignee: Husqvarna Outdoor Products Inc.
    Inventors: Rodney W. Tynes, Paul A. Warfel, Dennis S. Zapanta
  • Publication number: 20080223228
    Abstract: A horizontal meat slicer includes a frame and a lower conveyor belt having forward and rearward ends, the lower conveyor belt operative to receive a meat product thereon and transport it into and through the device. An upper pressing conveyor belt includes forward and rearward ends, the upper pressing conveyor belt and the lower conveyor belt cooperating such that meat product is compressed between the lower conveyor belt and the upper pressing conveyor belt. At least one bandsaw blade is rotatably mounted on the frame, a cutting section of the bandsaw blade traveling between the upper belt and lower belts. Finally, at least one drive device such as a motor is operatively connected to each of the conveyor belts and the bandsaw blade to drive them to pull the meat product through the device and cut the meat product via the cutting edge of the bandsaw blade.
    Type: Application
    Filed: May 23, 2008
    Publication date: September 18, 2008
    Inventors: Henry Biggs, Steve Korteley
  • Patent number: 7412769
    Abstract: Disclosed is a chain saw which includes chain saw chain tensioning and braking systems. Tensioning and braking are effected by the presence and control of longitudinal slits in an elongated support which provides a continuous chain channel guide in its outer circumference.
    Type: Grant
    Filed: November 10, 2004
    Date of Patent: August 19, 2008
    Inventor: William C. King
  • Patent number: 7311029
    Abstract: A quick-pin blade tensioning device for a band saw comprises a sliding tension bracket coupled with an upper arm of the band saw. The sliding tension bracket engages an upper band wheel which has a band saw blade coupled to it. A lifting shoe, slidably disposed within the upper arm, imparts movement to the sliding tension bracket. A pin moves the lifting shoe through rotational movement of the pin imparted by a coupling with a tension crank. The tension crank, disposed within the upper arm, has rotational movement imparted to it through a coupling with a tension handle enabled with multiple positions.
    Type: Grant
    Filed: July 17, 2003
    Date of Patent: December 25, 2007
    Assignee: Black & Decker Inc.
    Inventor: Rockne W. Behne
  • Patent number: 7287330
    Abstract: A chain saw automatic tensioner preferably includes a base plate, a chain bar, a tensioning cylinder, a sliding block and a pusher block. The base plate includes a sliding slot that is sized to slidably receive the sliding block. The chain bar includes a substantially half oval shape that is sized to retain a cutting chain. An end of the chain bar is retained between a top of the sliding block and a bottom of the pusher block. The tensioning cylinder is mounted to the base plate opposite the sliding slot. Hydraulic oil in the tensioning cylinder forces a cylinder rod and the pusher block secured to the chain bar away from a chain sprocket and thus tensioning the cutting chain.
    Type: Grant
    Filed: September 29, 2004
    Date of Patent: October 30, 2007
    Assignee: G&R Equipment, LLC
    Inventor: Gary D. Riha
  • Patent number: 7276003
    Abstract: A vertical band saw machine includes a first transmitting shaft driven by a drive force of a motor, a second transmitting shaft journaling a lower blade mounting pulley for rotating an endless band saw blade, and a speed ratio varying device coupling the transmitting shafts. The device includes two pitch-variable first and second pulleys mounted on the transmitting shafts, a belt trained on the pulleys, and a control unit operable to move a movable disc of the second pulley toward or away from a fixed disc of the second pulley so as to vary the radial distance between the belt and each of the transmitting shafts, thereby freely varying the speed ratio of the second transmitting shaft to the first transmitting shaft so as to rotate the saw blade at a desired speed.
    Type: Grant
    Filed: September 14, 2004
    Date of Patent: October 2, 2007
    Inventor: Juei-Seng Liao
  • Patent number: 7210387
    Abstract: A vertical band saw machine includes a base, an upright post extending from the base, amounting frame slidably retained relative to the upright post, upper and lower blade mounting pulleys and a tension-equalizing guider pulley rotatably mounted on the mounting frame, the base and the upright post, respectively, an endless band saw blade trained on the pulleys to define upper and lower inclined side paths, and a tension adjusting member disposed to displace the mounting frame between a loosened position to facilitate replacement of the blade, and a tensed position. The guider pulley is brought into synchronized movement with the mounting frame such that the ratio of lengths between the upper and lower inclined side paths is kept unchanged.
    Type: Grant
    Filed: September 14, 2004
    Date of Patent: May 1, 2007
    Inventor: Juei-Seng Liao
  • Patent number: 7077041
    Abstract: A cutting system includes a bandsaw employing a saw blade with an improved cutting edge. The system may employ an upper tensioning assembly and/or a lower tensioning assembly to offset the blade with respect to conventional bandsaw arrangements for applying a continuous tensioning force against the blade during use. In use, the system increases the quality of the cut and provides a straighter cut while decreasing the amount of dust generated in the cutting process as compared to conventional methods, namely, the use of circular saws.
    Type: Grant
    Filed: December 31, 2003
    Date of Patent: July 18, 2006
    Assignee: Weyerhaeuser Company
    Inventors: Arden L. Kunkel, Myron Sangren
  • Patent number: 6944958
    Abstract: A chain saw which includes chain tensioning and braking systems. Tensioning and braking are caused by the presence and control of longitudinal and lateral slits in an elongated support which provides a continuous chain channel guide in its outer circumference.
    Type: Grant
    Filed: January 15, 2002
    Date of Patent: September 20, 2005
    Inventor: William C. King
  • Patent number: 6868765
    Abstract: A contour-cutting machine, in particular for foam. A workpiece table (1) with a table gap (4) and a drive (2) for moving workpieces (3) in the longitudinal direction (X). A movable cutting-element carrier (20) with four pulleys (31 to 34) and an endless cutting element (30) has an open side (20d) and an opposite side (20c). The cutting-element carrier (20) can be supported and driven in the transverse direction (Y) of the table, on a stationary frame (10), which encloses the workpiece table (1) in the vicinity of the table gap (4), on the open side (20d). The cutting-element carrier can also be moved and supported in the longitudinal direction (X) of the table on the opposite side (20c).
    Type: Grant
    Filed: February 2, 2001
    Date of Patent: March 22, 2005
    Assignee: Albrecht Baumer GmbH & Co. KG Spezialmaschinenfabrik
    Inventor: Rolf Poetzsch
  • Patent number: 6691599
    Abstract: A cutter guard device is adapted for use in a belt saw machine, and includes a stationary hinge leaf formed with a first knuckle unit, a movable hinge leaf formed with a second knuckle unit, and a hinge pin extending through the first and second knuckle units, thereby permitting rotation of the movable hinge leaf between cutter concealing and cutter exposing positions. The movable hinge leaf is further slidable along the hinge pin between retaining and pivoting positions. The movable hinge leaf is movable between the cutter concealing and cutter exposing positions when disposed in the pivoting position on the hinge pin. A retention unit retains releasably the movable hinge leaf in the cutter concealing position when the latter is further disposed in the retaining position on the hinge pin.
    Type: Grant
    Filed: January 11, 2002
    Date of Patent: February 17, 2004
    Assignee: P & F Brother Industrial Corporation
    Inventor: Mei-Lan Kao
  • Patent number: 6679149
    Abstract: A band saw apparatus including a blade under tension and has a frame that includes a pivotably connected drive mount and a rotatable wheel supported by the drive mount. The blade extends about the rotatable wheel. A tensioner is used to set the blade tension so as to minimize objectionable noise and vibration. The tensioner also facilitates raising the drive mount and support wheel for blade removal.
    Type: Grant
    Filed: July 6, 1999
    Date of Patent: January 20, 2004
    Assignee: Premark FEG L.L.C.
    Inventors: Gongpu Yan, Lynn Alan McGriff
  • Patent number: 6595097
    Abstract: A band saw shielding device is linked with an elevation guiding set of a band sawing machine comprising a wheel on which the band saw runs, and a stop portion. The shielding device comprises a main housing fastened with the elevation guiding set and having a front plate with a hollowed portion, a position confining portion disposed longitudinally and a band replacing slot, a receiving space formed in the center thereof for receiving the band saw; a movable cover having a slide plate disposed slidably at the position confining portion of the main housing, a stop edge connected with the slide plate and stopped by the stop portion of the band sawing machine. The shielding device cooperates with the elevation guiding set to surround the band saw, so as to prevent the band saw from being a safety hazard. The wheel is still received in the hollowed portion without interference when the main housing is raised.
    Type: Grant
    Filed: July 9, 2001
    Date of Patent: July 22, 2003
    Assignee: Oav Equipment & Tools, Inc.
    Inventor: Lien-Chu Lee
  • Publication number: 20030131706
    Abstract: A cutter guard device is adapted for use in a belt saw machine, and includes a stationary hinge leaf formed with a first knuckle unit, a movable hinge leaf formed with a second knuckle unit, and a hinge pin extending through the first and second knuckle units, thereby permitting rotation of the movable hinge leaf between cutter concealing and cutter exposing positions. The movable hinge leaf is further slidable along the hinge pin between retaining and pivoting positions. The movable hinge leaf is movable between the cutter concealing and cutter exposing positions when disposed in the pivoting position on the hinge pin. A retention unit retains releasably the movable hinge leaf in the cutter concealing position when the latter is further disposed in the retaining position on the hinge pin.
    Type: Application
    Filed: January 11, 2002
    Publication date: July 17, 2003
    Applicant: P & F BROTHER INDUSTRIAL CORPORATION
    Inventor: Mei-Lan Kao
  • Patent number: 6557447
    Abstract: A band sawing machine has a band saw which runs on a drive wheel and a driven wheel of the band sawing machine. The band sawing machine is provided with a slide seat to which the driven wheel is pivoted. The band sawing machine is provided with an eccentric wheel in contact with the slide seat. The eccentric wheel is turned to bring about a change in diametrical distance, thereby resulting in the up-and-down movement of the slide seat. The distance between the drive wheel and the driven wheel is thus shortened to facilitate the replacing of the band saw.
    Type: Grant
    Filed: September 5, 2001
    Date of Patent: May 6, 2003
    Inventor: Lien-Chu Lee
  • Publication number: 20030005806
    Abstract: A band saw shielding device is linked with an elevation guiding set of a band sawing machine comprising a wheel on which the band saw runs, and a stop portion. The shielding device comprises a main housing fastened with the elevation guiding set and having a front plate with a hollowed portion, a position confining portion disposed longitudinally and a band replacing slot, a receiving space formed in the center thereof for receiving the band saw; a movable cover having a slide plate disposed slidably at the position confining portion of the main housing, a stop edge connected with the slide plate and stopped by the stop portion of the band sawing machine. The shielding device cooperates with the elevation guiding set to surround the band saw, so as to prevent the band saw from being a safety hazard. The wheel is still received in the hollowed portion without interference when the main housing is raised.
    Type: Application
    Filed: July 9, 2001
    Publication date: January 9, 2003
    Inventor: Lien-Chu Lee
  • Publication number: 20020059856
    Abstract: A positioned sensing device measures and/or calculates the lateral position and movement of a saw blade. These measured and calculated values are used to automatically alter the work-feed rate and/or saw blade rim speed either up or down as sawing conditions change within the work piece or between different work pieces.
    Type: Application
    Filed: January 7, 2002
    Publication date: May 23, 2002
    Applicant: SIMONDS INDUSTRIES, INC.
    Inventor: H. Reid Smith
  • Publication number: 20010054337
    Abstract: A method and apparatus for tensioning a continuous loop, such as a cutting blade installed on a band saw having a frame, a manually rotatable tensioner, a first pulley rotatably connected to the manually rotatable tensioner, a second pulley spaced away from the first pulley, and a cutting blade strung between the first pulley and the second pulley, generally including the steps of positioning an adjustable body, such as a reciprocally actuated rod, between the manually rotatable tensioner and the second pulley, extending the adjustable body in a direction away from the second pulley and toward the manually rotatable tensioner so that the manually rotatable tensioner and the first pulley move in direction away from the second pulley, withdrawing the adjustable body in a direction toward the second pulley so that the manually rotatable tensioner and the first pulley move in a direction toward the second pulley.
    Type: Application
    Filed: June 22, 2001
    Publication date: December 27, 2001
    Inventor: Howard L. Snodgrass
  • Patent number: 6199468
    Abstract: The contour cutting machine comprises an endless circulating bandknife (22) which is guided around bandknife pulleys (30-34). To allow adjustment of the cutting strand (23) in the Y-direction, the bandknife (22) forms two loops (28,36) merging into each other, one (36) of these two loops serving for length compensation. The bandknife pulley (30) arranged at the transition from the second loop (36) to the first loop (28) guides the bandknife (22) therearound at a looping angle of substantially 270° so that all of the bandknife pulleys (30-34) are contacted by the same surface of the bandknife (22). The bandknife (22) will always be bent in one direction only. By thus avoiding alternating bending directions, the lifespan of the bandknife (22) is lengthened.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: March 13, 2001
    Assignee: Fecken-Kirfel GmbH & Co. Maschinenfabrik
    Inventors: Jan Hackbarth, Claus Schiffler
  • Patent number: 6196104
    Abstract: The invention relates to a method for producing sheets of polymeric surfacing, the sheets produced thereby, and the apparatus used to produce the sheets. The method includes providing a solid polymeric slab, and slicing the slab into sheets of surfacing. The sheets may include polymeric particles contained in a polymeric matrix. The particles may have a maximum linear dimension that is greater than the final thickness of the sheets, thereby resulting in an aesthetically pleasing “chunky” appearance. The apparatus used to slice the sheets produces a relatively smooth, uniform surface, and is capable of dramatically limiting the amount of variation in thickness within a finished sheet.
    Type: Grant
    Filed: April 23, 1998
    Date of Patent: March 6, 2001
    Assignee: Premark RWP Holdings, Inc.
    Inventors: Frank Bell Cloud, Robert Edward Respess
  • Patent number: 5497687
    Abstract: A table-top cutting machine includes a base having an upright support, a motor mounted on the upright support, a belt type cutting tool mounted around a horizontal pulley wheel and a vertical pulley wheel. The cutting tool is stretched at a right angle by a first rotor, which is mounted on the upright support at the top, and a second rotor, which is mounted on the upright support at the bottom. A guard longitudinally covers the belt type cutting tool at one side permitting only the cutting edge to be longitudinally exposed to the outside at one side for cutting. A tool grinder includes two emery-wheels disposed at two opposite sides by the cutting edge. The emery-wheels contact to the two opposite sides of the cutting edge by means of a pressure rod. When the motor is turned on, the belt type cutting tool is rotated to cut cloths smoothly and stably without producing much noise. Furthermore, much cost can be curtailed due to fewer machine elements which are used for manufacturing the present invention.
    Type: Grant
    Filed: August 2, 1994
    Date of Patent: March 12, 1996
    Inventor: Hai-su Huang
  • Patent number: 5377571
    Abstract: A safety guard system for a band saw that comprises a flexible member and a sensor for deactivating the band saw when the flexible member is not deployed correctly. The flexible member has a resting position and a sawing position. In both positions, the flexible member provides a protective barrier between the band saw user and the band saw blade. The flexible member automatically adjusts by flexing to accommodate different sized work pieces.
    Type: Grant
    Filed: October 19, 1993
    Date of Patent: January 3, 1995
    Inventor: Harold Josephs
  • Patent number: 5345850
    Abstract: A bandsaw assembly including an improved drive belt tensioning device which enables efficient manual engagement and disengagement from the drive belt through use of an overcenter bracket. The overcenter bracket includes a spring releasably holding the tensioning device out of engagement with the belt to permit the operator to use both hands during a belt changing operation.
    Type: Grant
    Filed: August 9, 1993
    Date of Patent: September 13, 1994
    Assignee: S-B Power Tool Company
    Inventor: Roger D. Neitzell
  • Patent number: 5109744
    Abstract: A band saw for cutting animal carcasses and the like includes a housing and a lid rotatably connected therewith for movement between open and closed positions. Within the housing are provided a pair of pulleys for supporting a cutting band. Guides are provided adjacent the pulleys to twist the band 90.degree. to define a cutting segment thereof. Each guide includes a first guide member connected with the housing and a second guide member connected with the lid and defining a gap for receiving the band when the lid is closed. When the lid is opened, the second guide member is remotely positioned form the first guide member, thereby providing easy access to the band for replacement thereof.
    Type: Grant
    Filed: July 19, 1990
    Date of Patent: May 5, 1992
    Assignee: Reinhard Freund Maschinenbau
    Inventors: Manfred Syre, Reinhard Freund
  • Patent number: 5065652
    Abstract: A scroll saw has a base including integral walls forming a gear casing, a frame assembly mounted on the base, and lower and upper oscillating arm members pivotally mounted on the frame assembly. The gear casing houses gear and counterweight assemblies for driving and counterbalancing the oscillating motion of the lower and upper arm members. A saw blade is removably mounted between corresponding free ends of the lower and upper reciprocating arm members. The ends of the saw blade are prepositioned between a pair of blade holders, and the entire assembly of blade and blade holders is then attached as a unit to the free ends of the arm members. Blade tension is adjusted by means of a tensioning system that indexes blade tension to rotation of a tension knob. The saw further includes a nonflexible tube which functions as a combination airblaster and blade guard for directing an air stream into a cutting area to remove sawdust and other debris while preventing accidental contact with the saw blade.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: November 19, 1991
    Assignee: Shopsmith, Inc.
    Inventors: John G. Legler, Robert L. Bartlett, David D. Flora
  • Patent number: 4909115
    Abstract: A band saw blade is loaded between pairs of guide wheels upon tensioning the blade by guiding the blade between pairs of spaced guide plates which define converging slots that converge toward the guide wheels. The approach is particularly useful in loading blades on underwater band saw machines used to cut radioactive materials.
    Type: Grant
    Filed: June 29, 1989
    Date of Patent: March 20, 1990
    Inventor: Steven R. Reeves
  • Patent number: 4854208
    Abstract: To cut a workpiece along two different cutting directions, the band saw teeth are set horizontally by a band saw guide device and then the cutting head (CH) is moved frontward, for instance; thereafter, the band saw teeth are twisted downward by the same guide device and then the cutting head is moved downward. The machine is effectively usable in cutting off a test piece from a large workpiece. To improve the cutting precession, various novel devices are incorporated, such as a balance cylinder (B-CYL) for allowing the cutting head to move up and down smoothly; two back-and-forth cylinders (BF-CYL) for moving the cutting head back and forth in symmetrical pressure application; cutting head fix device (FD); a rigid guide column; band saw holding device (BSH); a slidable small-diameter driven wheel arranged within the cutting head (CH), etc.
    Type: Grant
    Filed: July 31, 1987
    Date of Patent: August 8, 1989
    Assignee: Amada Company, Limited
    Inventor: Minoru Aoyagi
  • Patent number: 4763637
    Abstract: A stone saw comprises a revolving sawing rope, a backing roller supporting the revolving sawing rope at each end of a sawing portion on one side of the sawing rope axis against cutting pressure exerted upon the sawing rope, the cutting pressure causing radial wear on the backing rollers, a feed drive for feeding the sawing rope in a revolving direction over the backing rollers, and housings supporting the backing rollers and pivotally adjustable about the sawing rope axis in dependence on the revolving direction of the sawing rope, the backing rollers being mounted in the housings transversely adjustably to the axes thereof and to the sawing rope axis. A clearance sensor is associated with, and radially spaced from, the backing roller for detecting the clearance between the sensor and the backing roller, the distance varying with the radial wear of the backing roller, the clearance sensor emitting a control signal corresponding to the detected clearance.
    Type: Grant
    Filed: February 5, 1987
    Date of Patent: August 16, 1988
    Inventor: Wolfgang Mayer
  • Patent number: 4597132
    Abstract: A band saw wherein one of the pulleys for an endless band-like blade is movable toward and away from the other pulley to relax the tension upon or to tension the blade. The one pulley is permanently biased away from the other pulley by a relatively weak spring whose bias can be overcome by hand to facilitate the removal of a blade or the application of a fresh blade. In addition, the one pulley is normally biased away from the other pulley with a pronounced force by a package of dished springs whose bias upon the one pulley can be interrupted by a single-acting cylinder and piston unit whose piston is installed between the dished springs and a reciprocable carriage for the one pulley. The dished springs react against a support for the pulleys and bear against the piston.
    Type: Grant
    Filed: May 24, 1984
    Date of Patent: July 1, 1986
    Assignee: Schmid & Wezel
    Inventors: Stefan Elmer, Erich Forberger
  • Patent number: 4563817
    Abstract: One side of the base end of a chain saw bar and an opposing abutment member relative to which the base end of the saw bar is releasably clamped include ratchet and pawl structure operative, when the clamping action between the abutment member and the saw bar base end is relaxed, to allow lengthwise saw chain tightening adjustment of the saw bar in a first direction and to prevent lengthwise displacement of the saw bar relative to the abutment member in the opposite direction.
    Type: Grant
    Filed: July 7, 1983
    Date of Patent: January 14, 1986
    Inventor: Dawson N. Leighton
  • Patent number: 4386545
    Abstract: An elongated stamped sheet-metal slider member facilitates the alinement and support for the guiding pulley of a band saw. The slider member has several integrally-formed portions. A first portion depends within the housing, and the pulley is rotatably supported thereon about an axis substantially perpendicular thereto. A second portion of the slider member is bent away, forming an obtuse angle with the first portion, and extends through a slotted opening formed in the housing. This second portion has a pair of ears projecting laterally of the slotted opening for preventing the slider from passing completely into the housing. The ears have respective side edge portions engaging the outer surface of the housing and forming therebetween a fulcrum for pivotal movement of the slider member and hence the pulley about an axis which is above the pulley axis and transverse thereto. A jack screw is carried by the housing for engaging the first portion of the slider member below the pulley axis.
    Type: Grant
    Filed: August 7, 1981
    Date of Patent: June 7, 1983
    Assignee: Black & Decker Inc.
    Inventor: Peter C. Chaconas
  • Patent number: 4237757
    Abstract: A system for introducing "tensioning" stress distribution into the wide bandsaw blade without its plastic deformation, for automatically compensating for blade temperature expansions and blade manufacturing inaccuracies, and for controlling blade position on the bandsaw wheels, comprising: torsional loading of the back, noncutting section of the bandsaw blade by using two actuators acting as a couple; continuously sensing for a displacement of the bandsaw blade during sawing from a set position on the wheels and countering the adverse effect of such displacement by generating a corrective displacement in the opposite sense relative to the said set position through the change of the ratio of forces forming the said couple.
    Type: Grant
    Filed: December 1, 1978
    Date of Patent: December 9, 1980
    Inventor: Tomo Bonac
  • Patent number: 4204444
    Abstract: A protective device for a band saw machine is secured to the guards which are normally found on such machines. The device extends downwardly from the guards to the plane of the table, on which the blocks to be cut are placed. The device encloses the band saw and prevents inadvertent contact therewith. The device comprises two members, a fixed member secured to the guard and a movable member secured to the fixed member. The movable member is locked to the fixed member. When a block contacts the device the movable member is released until the block has been cut. The movable member returns to the locked position after the block has been cut.
    Type: Grant
    Filed: February 1, 1979
    Date of Patent: May 27, 1980
    Inventor: John M. Kohr
  • Patent number: 4128031
    Abstract: A bandsaw wheel having laterally spaced grooves in the periphery thereof. Annular rubber-like members are received in the grooves and protrude therefrom beyond the wheel periphery to provide radial support for a bandsaw blade at a plurality of laterally spaced locations.
    Type: Grant
    Filed: September 2, 1977
    Date of Patent: December 5, 1978
    Assignee: Amada Company, Limited
    Inventor: Masao Sato
  • Patent number: 3975978
    Abstract: A direct coupled way system for band saw machines wherein a cutting band is trained in tension over spaced upstream and downstream band wheels which are supported by a movable head for moving the cutting band with respect to a work piece held in position in the path of the cutting band by an arrangement of support members. A shoe is slidably connected to the downstream support member, i.e. the support member which lies between the work piece and the downstream band wheel.
    Type: Grant
    Filed: May 9, 1975
    Date of Patent: August 24, 1976
    Assignee: Continental Machines, Inc.
    Inventor: Charles E. Cleland
  • Patent number: 3974724
    Abstract: A guard barrier in front of the exposed portion of the blade of a band saw is raised or lowered responsive to the elevation of the portion of the non-planar workpiece which is approaching the blade to be cut so that the varying length of exposed blade is continuously guarded without interfering with the cutting operation. A pneumatic cylinder controls the position of the guard barrier. Cam followers at the bottom end of the barrier ride along the uneven surface of the workpiece acting as a cam and follower movements operate a throttle valve which controls the pressure in the pneumatic cylinder to cause the barrier to move to and hover at its guarding location. An auxiliary valve is provided for rapid raising of the barrier to accommodate a steep rise on the workpiece, to broaden the range of useful operation in relation to workpiece profiles, and for manually controlled lifting of the guard.An electric system is coordinated with the pneumatic system to provide control and safety features.
    Type: Grant
    Filed: May 14, 1975
    Date of Patent: August 17, 1976
    Assignee: Plastofilm Industries, Inc.
    Inventor: Jesse L. Shadle
  • Patent number: 3939749
    Abstract: A band saw which has a displaceable guard rail that covers the saw blade in the cutting region thereof above the feed table and is adapted to be displaced upward in a direction parallel to the saw blade and away from the feed table to the height necessary to allow passage of the stock that is being cut. The band saw includes apparatus for raising the guard rail the necessary height in response to exerting pressure by the stock against the guard rail in the direction of cutting, and the apparatus will then maintain the guard rail at a height conforming to the contour of the stock as the latter is passed through the saw blade. Other apparatus provides smooth movement of the guard rail during cutting operations and provides for securing of the guard rail when the band saw is not in operation.
    Type: Grant
    Filed: May 5, 1975
    Date of Patent: February 24, 1976
    Assignee: Bizerba-Werke, Wilhelm Kraut KG
    Inventors: Ernst Muller, Alois Butz