Saw Patents (Class 33/202)
  • Patent number: 10758991
    Abstract: The invention relates to an automatic sharpener for cutting teeth of a chain-saw chain of the type that has links and cutting teeth comprising a depth gauge. The sharpener comprises a receiving region comprising a chain support that can receive a chain-saw chain of the above-mentioned type, a driving means allowing a preferably automatically regulated horizontal translation, forwards and in stages, of said chain-saw received in the receiving region, a sharpener means arranged so as to sharpen the cutting teeth at different sharpening angles, after each translation of a chain-saw chain, and a means for planing the depth gauge of a cutting tooth, the planing means and the sharpening means each comprising a flat file and a round file which are detachably secured in a file carrier.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: September 1, 2020
    Assignee: Usines Métallurginques de Vallorbe SA
    Inventors: Claude Currat, François Galloppini, Kevin Bernard, Xavier Greppin
  • Patent number: 10488191
    Abstract: A high-stability step gauge and a preparation method therefor, where the step gauge has a base body, the base body includes a pillar carrier disposed along a coordinate direction, gauge block mounting blocks are distributed on the pillar carrier, and gauge pieces are fixedly mounted on the gauge block mounting blocks. The high-stability step gauge has good accuracy and stability, a small size, and strong functions. Deformation errors caused by the step gauge due to factors such as a weight of the base body are effectively and prominently reduced by means of reasonable combination of the base body and the gauge block mounting blocks. The preparation method thereof provides a stable length direction low deformation performance by using a cylindrical rigid support as the base body. The sleeved gauge block mounting blocks have high fixed mounting stability, and positioning and assembly of the gauge pieces are accurate.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: November 26, 2019
    Inventor: Taixi Gan
  • Patent number: 9657729
    Abstract: Mounting structure for housing-free hydraulic axial piston machines of the bent axis or swash plate design, having a closing plate on which a cylinder block unit with displacing pistons arranged therein is supported, and having a drive or driven shaft. The mounting structure here is designed in the manner of a basket and has a receptacle for the drive or driven shaft and at least two struts which are in each case connected at one end to the receptacle and at the other end to the closing plate in such a manner that the closing plate, the cylinder block unit and the drive or driven shaft are held—analogously as in a housing—in a functionally ready position.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: May 23, 2017
    Assignee: DANFOSS POWER SOLUTIONS INC.
    Inventor: Harry Rasch
  • Patent number: 9551138
    Abstract: A connector is provided for connecting a bathtub tailpipe to a drain pipe. The connector has an inlet end to receive the tailpipe and an outlet end that is mountable to the drain pipe, and has a passage extending therebetween. A seal extends about the passage for slidably engaging the tailpipe in a fluid sealing manner.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: January 24, 2017
    Assignee: Oakville Stamping & Bending Ltd.
    Inventors: Christopher Adam McLeod, Robert Evans
  • Patent number: 9205503
    Abstract: The invention relates to a saw chain depth gauge filing template (1), comprising a first flat section (2) and a second flat section (3), wherein both sections (2, 3) are made from a single piece of flat metal, especially from sheet metal, wherein the first flat section (2) has a first bearing surface (4) for a cutter link edge (5) of a saw chain (6) to be filed, wherein the second flat section (3) has second bearing surfaces (7) for a drive link (8) of the saw chain (6), wherein the second surfaces (7) are established by an linear edge (9) in which at least two incisions (10, 11; 10, 11) are machined, wherein the second flat section (3) has at least one cutout (12, 12) for a part of the saw chain (6) to be sharpened by filing. Furthermore, the invention relates to a method for sharpening a saw chain by using such a saw chain depth gauge filing template. By the proposed concept filing of a saw chain becomes possible in a more precise way.
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: December 8, 2015
    Assignee: HUSQVARNA AB
    Inventors: Henrik Sohlman, Rashid Gawad, Christian Liliegård, Per Carlbäck
  • Publication number: 20150113818
    Abstract: The invention relates to a saw chain depth gauge filing template (1), comprising a first flat section (2) and a second flat section (3), wherein both sections (2, 3) are made from a single piece of flat metal, especially from sheet metal, wherein the first flat section (2) has a first bearing surface (4) for a cutter link edge (5) of a saw chain (6) to be filed, wherein the second flat section (3) has second bearing surfaces (7) for a drive link (8) of the saw chain (6), wherein the second surfaces (7) are established by an linear edge (9) in which at least two incisions (10, 11; 10, 11) are machined, wherein the second flat section (3) has at least one cutout (12, 12) for a part of the saw chain (6) to be sharpened by filing. Furthermore, the invention relates to a method for sharpening a saw chain by using such a saw chain depth gauge filing template. By the proposed concept filing of a saw chain becomes possible in a more precise way.
    Type: Application
    Filed: July 5, 2012
    Publication date: April 30, 2015
    Applicant: Husqvarna AB
    Inventors: Henrik Sohlman, Rashid Gawad, Christian Liliegård, Per Carlbäck
  • Patent number: 7762003
    Abstract: The invention is directed to a guide for a power saw or router of the type having a blade and housing wider than the blade which directly overlies the blade during the cutting operation. The guide includes a saw guide having a straight outer edge configured for guiding a peripheral edge of the saw housing. Attached to the saw guide is an angle brace that is used to place the guide at four different angles. Attached by bolt to the saw guide is the work piece guide that is placed against the object you are cutting so that you cut a straight angle every time.
    Type: Grant
    Filed: April 25, 2008
    Date of Patent: July 27, 2010
    Inventor: John Waltman, Jr.
  • Patent number: 7467475
    Abstract: A leveling device permitting adjustment to level of a table saw planar surface by a first bubble level and thereafter adjustment of the leveling device to a desired cutting angle, followed by setting the table saw blade to the point where a second perpendicular bubble level.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: December 23, 2008
    Inventor: Attila G. Cheek
  • Patent number: 6812422
    Abstract: A circuit breaker includes a case, separable contacts, an operating mechanism having an open position, a snap closed position, a closed position, an operating handle for moving the operating mechanism between the open and closed positions, a movable contact arm carrying a movable contact, a link having a first end pivotally mounted with respect to the case, a second end and a projection, and a linkage. A first end of the linkage is pivotally mounted to the link second end. A second end of the linkage is pivotally mounted to the movable contact arm. A flexible cantilever lever is fixed within the case, engages the link projection and holds the link in the open position of the operating mechanism. The flexible cantilever lever flexes and releases the link projection and releases the link as the operating handle moves the operating mechanism from the open position to the snap closed position.
    Type: Grant
    Filed: October 24, 2003
    Date of Patent: November 2, 2004
    Assignee: Eaton Corporation
    Inventor: Robert M. Slepian
  • Patent number: 6812423
    Abstract: A circuit breaker includes separable contacts, a trip mechanism having an armature mechanism responsive to selected conditions of current flowing through the contacts, and an operating mechanism for opening and closing the contacts. The operating mechanism includes an open position, a closed position, a tripped open position, a lock, a first link and a second link having a base and a pair of legs. The lock is pivotally mounted to and substantially between the legs of the second link. The first link is pivotally mounted to the second link. The first link and the second link have an unbroken state in the closed position and a broken state in the tripped open position. The lock maintains the unbroken state in the closed position and responds to the armature mechanism to release the first link and the second link to the broken state in the tripped open position.
    Type: Grant
    Filed: October 24, 2003
    Date of Patent: November 2, 2004
    Assignee: Eaton Corporation
    Inventors: Craig A. Rodgers, Lance Gula, Robert M. Slepian
  • Patent number: 5493789
    Abstract: A miter gauge and saw blade calibrator is in the form of a flat plate with grooves defined in top and bottom surfaces at various angles. The grooves are sized to receive the bar of a miter gauge so that bar can be elevated above a table slot with its side extending above the slot abutting a side of the groove. The calibrator is slid along the bar toward the miter head until the miter head lays flat against one of the sides of the calibrator on both sides of the bar, to set the angle between the head and the bar equal to the angle between the groove and the corresponding side of the calibrator. Fine angle calibration bars can also be provided between the calibrator and the miter head so as to set smaller or unusual angle increments. In addition, the perimetral edges of the calibrator form different angles so that one edge can be placed against the table top surface of a table saw or other tool and another edge against the blade to accurately set the angle of the blade.
    Type: Grant
    Filed: February 17, 1995
    Date of Patent: February 27, 1996
    Inventor: Mark A. Duginske
  • Patent number: 5241882
    Abstract: Filing gauge for sharpening of a saw chain with cutter (13) and depth gauge (14), comprising a housing (21) which can be located on the saw chain in two angular positions, two parallel shafts (26,27) fixed to the housing, two rollers (28,29) with guiding grooves for a round file slidingly journalled on the shafts, a roller follower (30) slidingly journalled on the shafts without angular mobility and permitting only parallel and simultaneous motion of the rollers, and a guide plate (40) for filing the depth gauge swingably affixed to the housing.
    Type: Grant
    Filed: August 19, 1992
    Date of Patent: September 7, 1993
    Assignee: Sandvik AB
    Inventor: Lars O. Eriksson
  • Patent number: 5121554
    Abstract: An adjustable miter gage apparatus and method for making precision miter cut angles with conventional radial arm saws, table saws, band saws, router tables, and other woodworking machines. The miter gage apparatus utilizes a flat base or table top with a large radius arc thereon and adjustable gages located on the circumference of the arc. The apparatus acts as a large protractor and allows the cutting angle to be accurately adjusted relative to the actual angle at which the saw blade is initially positioned by the woodworking machine. The adjustable gages have set screws threadedly mounted therein for making fine adjustments and may be permanently or removably installed on the base or table top. The set screw threads and radius of the arc are related such that turning the set screw will increase or decrease the angle to within a fraction of a degree. A preliminary angle setting is made using the existing miter scale on the woodworking machine.
    Type: Grant
    Filed: April 4, 1991
    Date of Patent: June 16, 1992
    Inventor: Billy M. Havins
  • Patent number: 4976046
    Abstract: A multi-sided gauge and layout tool which includes the five angles needed in order to adjust or set-up woodworking and other machinery to fabricate multi-sided or multi-segmented structures having four, five, six, eight or twelve sides. A large knob with a flat bottom and a slot having a sloping bottom may be removably mounted in the middle of the gauge to facilitate grasping and manipulating the gauge when it is used flat against a work surface and may be removed and used as a base to hold the gauge body upright within the slot.
    Type: Grant
    Filed: April 10, 1989
    Date of Patent: December 11, 1990
    Assignee: Lee Valley Tools Ltd.
    Inventors: Leonard G. Lee, Francis A. McLean
  • Patent number: 4862593
    Abstract: A hook angle gauge having a bar with a straight bottom edge that lays across the cutting corners of successive cutting links in a length of saw chain. A face plate includes a series or row of holes or openings that simulate the cross section of the file used to sharpen the cutting links. Different height placements of the openings relative to the bar edge indicate different hook angles. An operator slides the face plate across a selected cutting link side plate until an opening therein matches the configuration of the side plate cutting edge. Each opening is marked with the hook angle setting indicated by that opening to enable the operator to determine the cutting link's hook angle.
    Type: Grant
    Filed: March 18, 1988
    Date of Patent: September 5, 1989
    Assignee: Blount, Inc.
    Inventor: Michael V. Petrovich
  • Patent number: 4821608
    Abstract: A chain saw sharpening guide is comprised of a relatively thick rigid and rugged plate metal member which has a threaded bore to receive a micrometer-type height adjustment screw to give an accurate indication of the raker (also called depth gauge) tooth on the chain. The metal plate member is elongated and has a length spanning at least the distance between at least three consecutive teeth on the chain saw. A cut-out or notch formed on one long side of the plate member permits the plate to rest on two consecutive teeth on the same side of the chain saw with the intervening tooth on the opposite side projecting upwardly into the notch or cut-out space so that the measurements of depth of cuts skips the tooth on the opposite side of the chain and uses for the depth gauge measurement the two teeth on the same side of the chain. A sunburst angle gauge from 0 to 35 degrees (in 5 degree increment) for either the left or right tooth angles is formed in the top surface.
    Type: Grant
    Filed: April 4, 1988
    Date of Patent: April 18, 1989
    Inventor: Garrett W. Reed
  • Patent number: 4785550
    Abstract: A linear position index bar is fixed to the frame of a horizontal band saw adjacent the workpiece support table. A linear indexing clamp assembly is mounted to the bar and movable along it to primary indexing locations. A workpiece end locator stop is micrometer mounted to the clamp assembly and associated with a dial indicator for precision indication of positions within a range of one measuring increment of the index bar. Major changes of stock stop position from the saw blade are done by moving the index clamp. Precision positioning is accomplished with a decimal setting knob on the micrometer.
    Type: Grant
    Filed: April 28, 1987
    Date of Patent: November 22, 1988
    Inventor: Larry C. Wilkins
  • Patent number: 4745827
    Abstract: A filing guide for a saw chain having inner links with spaces therebetween, outer links and cutter teeth. The filing guide comprises a rigid body with a front edge shaped to abut against the inner links and a pair of spaced-apart elongated members extending perpendicularly from the body adjacent the front edge. The members are shaped to fit within the spaces between the inner links and the body is shaped to glidably receive a round file so that a cutter tooth can be filed by the round file when the filing guide is positioned for use with the members inserted in the spaces between the inner links. The top of the body is flat.
    Type: Grant
    Filed: August 4, 1987
    Date of Patent: May 24, 1988
    Inventor: Daniel Kuwica
  • Patent number: 4738165
    Abstract: A file guide for filing a depth gauge on a saw chain cutter having a cutting tooth with a cutting tip while the cutter is connected as a part of a continuous saw chain. The file guide is adapted to rest on the saw chain incorporating a plurality of cutters and includes an elongated base member having a slot to receive a portion of a depth gauge and at least one downward projection depending from said base member to engage with the cutting tooth to cause said base member to avoid contact with the cutting tip of the cutting tooth.
    Type: Grant
    Filed: July 24, 1987
    Date of Patent: April 19, 1988
    Assignee: Textron Inc.
    Inventor: Mark Gelman
  • Patent number: 4719823
    Abstract: A sharpening guide for a chain saw with a vertical longitudinal channel which is placed on a saw chain and saw bar in a straddling position enabling the guide to move along the chain and bar while filing right hand and left hand cutters. The guide includes two transverse channels; six fixed transverse filing angles consisting of 30, 35 and 40 degrees with file and guide alignment lines; four 10 degree pitch filing angles; a detachable spacer to eliminate saw chain side movement or wobble; and an alignment and locking mechanism consisting of three adjustable bolts which holds the guide squarely and firmly in place allowing the operator to use both hands when filing cutters.
    Type: Grant
    Filed: January 6, 1986
    Date of Patent: January 19, 1988
    Inventor: Jack D. Pyle
  • Patent number: 4672751
    Abstract: A chain alignment tool to assist the alignment of a chain sprocket with respect to its chain. The tool is placed over a sprocket at a point where its chain tangentially contacts the sprocket. The tool is tightened against the sprocket and becomes aligned with the sprocket. The tool has an attached pointer which extends outwardly in a direction parallel to the surface of the sprocket. The end of the pointer should align with the chain if the chain is in alignment with the sprocket.
    Type: Grant
    Filed: July 23, 1986
    Date of Patent: June 16, 1987
    Inventor: J. D. Jones
  • Patent number: 4646589
    Abstract: A guide for aiding in sharpening a chain saw with a file which includes a magnet having an elongated rod extending outwardly therefrom at an angle corresponding to the desired angle that is to be sharpened on the cutting edge of a tooth of a chain saw. The magnet is attached to a guide bar of the chain saw. When sharpening the teeth, the chain is moved around the saw and a file is moved across the leading edge of the tooth at an angle corresponding to the angle of the rod.
    Type: Grant
    Filed: January 27, 1982
    Date of Patent: March 3, 1987
    Inventor: George E. Petitt, Jr.
  • Patent number: 4584774
    Abstract: A step gauge for setting up wood working power tools. The gauge has a planar surface on which a series of measurement steps is arranged in opposition to a reference edge. The surfaces of the steps are located at known fixed distances from the reference edge. In use the reference edge is placed against the table, fence or guide of a wood working power tool. When the tip or side of the blade or bit is rested against the edge of a given step the associated known fixed distance becomes the desired measurement. Specialty notches are provided interspersed with the series of measurement steps in order to allow the setup of specialty lumber processing; in the reference edge to permit the setup of joiners; and in the reference edge in aligned opposition to one of the measurement steps to function in cooperation with the reference edge as a square.
    Type: Grant
    Filed: November 26, 1984
    Date of Patent: April 29, 1986
    Inventor: Glennie W. Link
  • Patent number: 4567792
    Abstract: A device for sharpening saw chains while the saw chain is mounted on a chain saw cutting bar. The saw chain sharpening device is designed for use by a chain saw operator at the job site. The device comprises a frame configured to be straddle mounted over the saw chain and removeably clamped to the cutting bar. The frame has mounted thereon at least one pair of diammetrically opposed bushings having an inside diameter to accept a saw file and to permit the file to be slideably moved and axially aligned with the axis of alignment positioned relative to the saw chain so that the saw tooth being filed will be filed at the proper angle. The file guide bushings also provide precise control of the saw file position relative to the saw tooth being sharpened.
    Type: Grant
    Filed: May 21, 1984
    Date of Patent: February 4, 1986
    Inventor: Arnold L. Baldwin
  • Patent number: 4535654
    Abstract: A visual guide for sharpening chain saw teeth. Magnetic material is affixed to one leg of an elongated member having an L-shaped cross section. The magnetic material is affixed to the external portion of the leg such that when the device is magnetically attached to a chain saw blade, the other leg of the device will extend away from and parallel to the chain saw blade. Markings are formed on the upward-facing portion of the second leg indicating the correct angle for applying a circular file to the cutting edge of the chain saw tooth. Notches are formed on the device for use as a template in gauging the proper shape of the chain saw tooth being filed.
    Type: Grant
    Filed: November 10, 1983
    Date of Patent: August 20, 1985
    Inventor: Mark E. White
  • Patent number: 4473958
    Abstract: A filing guide for saw chain which includes a plate having a flat expanse joining with a curved expanse at the forward end of the guide which forms a cylinder. The guide is useable, with one side facing upwardly and the cylinder seated in a pocket defined in a saw chain, to guide a file during filing of a depth gauge and a safety projection in the saw chain. With the guide turned over from this position, and the cylinder again seated in the pocket, the guide is useable to guide a file during filing of a cutting edge in the saw chain.
    Type: Grant
    Filed: November 8, 1982
    Date of Patent: October 2, 1984
    Assignee: Carlton Company
    Inventor: Renwick S. Atkinson
  • Patent number: 4412463
    Abstract: A chain saw sharpening guide manually held in position on the saw chain comprising a support plate (11) carrying grooved rollers (13, 13a) mounted on brackets (12, 12a) depending from the plate (11). The rollers (13, 13a) are grooved (15, 15a) to receive the saw sharpening file (34) in rolling contact and maintain it parallel to the plate. In use the guide is located on the saw chain with the rollers straddling the chain with the file in contact with the saw tooth and with the rollers. A slot (16) in the plate (11) allows the operator to view the sharpening action. Variations provide graduations and stops for correct angle of cut and undercut of cutting edge plus adjustment of the saw tooth depth gauge.
    Type: Grant
    Filed: July 14, 1981
    Date of Patent: November 1, 1983
    Inventor: Cornelis J. M. Beerens
  • Patent number: 4404871
    Abstract: A portable chain saw sharpening kit comprises a sharpener body in the form of an inverted U-shaped channel-defining member adapted to be placed over the bar of a chain saw, a rotary burr with a tapered abradant end portion which is receivable in a selected one of two horizontal guide bores provided in the sharpener body, and an alignment pin which is likewise receivable in a selected one of the two guide bores. The alignment pin comprises a shank portion and a reduced end portion, the latter providing an abutment surface for positioning a cutting link within the sharpener body channel in the proper position for sharpening. The shank portion and reduced end portion of the alignment pin are preferably cylindrical and have different diameters, with the reduced end portion being eccentrically offset from the shank portion and having a diameter substantially equal to the widest diameter of the tapered abradent end portion of the rotary burr.
    Type: Grant
    Filed: October 2, 1981
    Date of Patent: September 20, 1983
    Inventors: Thomas A. Fritz, James W. Shrode
  • Patent number: 4404872
    Abstract: An attachment is provided for allowing a chain saw sharpener to be used for filing the depth gauge portions of the cutting links on the saw chain. The sharpener is of the type comprising a sharpener body in the form of an inverted U-shaped channel-defining member adapted to be placed over the bar of a chain saw, and a rotary burr with an abradant end portion which is receivable in a selected one of two horizontal guide bores provided in the sharpener body. The depth gauge attachment comprises an elongated gauge bar and means for removably affixing the gauge bar within the upper portion of the sharpener body channel so that the gauge bar occupies only a portion of the channel length.
    Type: Grant
    Filed: October 2, 1981
    Date of Patent: September 20, 1983
    Inventor: Thomas A. Fritz
  • Patent number: 4365420
    Abstract: Apparatus is disclosed for measuring characteristics of chains, preferably of the type utilized on chain saws, having a semicircular holder affixed at the end of an elongated scale and a semicircular shoe slidable along the scale, the scale having graduations indicative of the number of chain links and the apparatus having sight holes for measuring chain link pitch and gauge.
    Type: Grant
    Filed: March 27, 1981
    Date of Patent: December 28, 1982
    Inventor: William C. Walden
  • Patent number: 4218826
    Abstract: A gauge assembly for checking the alignment of radial arm saw blades relative to the saw table includes a base engageable within the saw fence guide slot with a vertical post extending upwardly from the base. A support arm is frictionally held upon the post for vertical sliding movement therealong and supports an indicator pointer pivoted to the support arm intermediate the ends of the pointer. One end of the pointer registers against an indicating plate or dial and the other end is provided with a saw blade contacting portion which is adjustable for contact with the blade surface. The gauge assembly can be used to check the perpendicular positioning of the blade relative to the table and the fore and aft parallel relationship of the blade to the table when the blade is vertical. It can also check the horizontal parallelism of the blade with respect to the surface of the table when the blade is turned horizontally.
    Type: Grant
    Filed: January 15, 1979
    Date of Patent: August 26, 1980
    Inventor: James G. Duke
  • Patent number: 4023445
    Abstract: A flat sheet metal plate defining a reference plane on one side. Said plate having first and second sections and an intermediate section. The first and second sections being flat and in a common plane, and the intermediate section formed into a semi-circular loop with a center portion of the loop removed. The remaining portions of the semi-circular loop provide a pair of guide lugs to guide a round file. The first and second sections are adapted to rest on the depth gauge and cutter of a cutting link in a saw chain with the guide lugs straddling the chain and aligned with the gullet of a cutting link to guide the file in a desired orientation against the cutting edge of the cutting link.
    Type: Grant
    Filed: October 1, 1975
    Date of Patent: May 17, 1977
    Assignee: Omark Industries, Inc.
    Inventor: Kay Silvon
  • Patent number: 4010661
    Abstract: A hand-held guide for use in combination with a file for sharpening chain saw cutting teeth, the guide holding said file in axial compression to permit mounting of said file at the axial extremes thereof and to facilitate rotation of said file relative said guide during use. A portion of said guide is designed, when said file is axially compressed in said guide, to abut the cylindrical wall of said file throughout a substantial portion of the file's length, and this same portion is formed as a guide designed to accurately locate the file relative a chain saw cutting tooth, and to provide a gage for determining the proper height of the depth gage portion of chain saw teeth.
    Type: Grant
    Filed: August 22, 1975
    Date of Patent: March 8, 1977
    Assignee: Fletcher Engineering, Inc.
    Inventor: J. Lawrence Fletcher
  • Patent number: 3942255
    Abstract: A filing guide for a chain saw which defines a longitudinal slot therethrough for the chain and at least one transverse slot is defined through the guide and channel for a file to be used on the teeth. Legs of the guide defining the chain channel are unequal in length so that pressure exerted by the thumb or fingers will clamp the guide laterally to the saw bar while downward hand pressure on the teeth hold the teeth firmly in the bar guide.
    Type: Grant
    Filed: April 1, 1974
    Date of Patent: March 9, 1976
    Inventor: Andrew G. Bakoledis
  • Patent number: 3935757
    Abstract: A tool for placing on a saw chain for guiding a round file for sharpening the cutting edge of a saw chain cutting tooth and for measuring the parameters of a saw chain.
    Type: Grant
    Filed: January 13, 1975
    Date of Patent: February 3, 1976
    Inventor: Elof Granberg