US2786650A - Invertible lift member with slidable jack head - Google Patents

Invertible lift member with slidable jack head Download PDF

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Publication number
US2786650A
US2786650A US521249A US52124955A US2786650A US 2786650 A US2786650 A US 2786650A US 521249 A US521249 A US 521249A US 52124955 A US52124955 A US 52124955A US 2786650 A US2786650 A US 2786650A
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jack
slidable
upright
invertible
secured
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US521249A
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Albert H Bottorff
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F1/00—Devices, e.g. jacks, for lifting loads in predetermined steps
    • B66F1/02—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts
    • B66F1/04—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts the posts being toothed
    • B66F1/06—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts the posts being toothed and the devices being actuated mechanically

Definitions

  • FIGURE 2 is a diagrammatic representation of FIGURE 1
  • FIGURE IO i w 3% 34 ⁇ x ⁇ 237' E'" III 3 22 I 32 l I I'll I' I I 35 C 37 as 23 FIGURE 9.
  • FIGURE IO i w 3% 34 ⁇ x ⁇ 237' E'" III 3 22 I 32 l I I'll I' I I 35 C 37 as 23 FIGURE 9.
  • FIGURE IO i w 3% 34 ⁇ x ⁇ 237' E'" III 3 22 I 32 l I I'll I' I 35 C 37 as 23 FIGURE 9.
  • FIGURE u
  • This invention relates to an improvement in a jack and more particularly to an invertible lift member with means for rapid primary adjustment.
  • An advantage of the presentimproved invention is to provide a slidable jack head with a front vertical channel shape member secured thereto and extended below the jack head and have means to receive an invertible lift member.
  • the invertible lift member or plate ma be manually and rapidly changed from a lowered floor level position on the channel shape member so as to be inserted below an article to be lifted, to a selected position of vertically spaced support positions on the channel for different types of objects to be lifted or lowered.
  • Figure l is a perspective view of the improved jack illustrating the front and left side thereof, the base plates and lift means or plate being on the floor in the lowered position.
  • Figure 2 is an enlarged sectional fragmentary view taken on lines 2-2 of Figure rotated clock-wise 90 degrees to illustrate the lower portion of the perforated web of the jack post in an upright manner bolted to the support plates.
  • Figure 3 is a perspective view illustrating the lift means or lift plate in an inverted position, from that shown in Figure l, with the integral upright member turned downward and the connection ribs projected therefrom.
  • Figure 4 is a perspective view of the improved jack illustrating the left side and rear thereof, the lift member being in the inverted position and the slidable head raised to an intermediate height on the jack post.
  • Figure 5 is a sectional view taken on lines 55 of Figure 1 and rotated clock-wise a few degrees to illustrate a plan View of the pair of base plates with support plates secured thereto and bolted to the section of the jack post, the sideplates and wheels are secured thereto.
  • Figure 6 is an enlarged side view of the slidable jack head mounted on a fragment of the jack post, and part of the jack handle is broken away.
  • Figure 7 is a sectional view taken on lines 7-7 of Figure 6 illustrating only the latch and a portion of the jack handle.
  • Figure 8 is a rear view of the slidable jack head with a portion of the jack post being broken away above and below the slidable jack head.
  • Figure 9 is a sectional view taken on lines 99 of Figure 8 with the climbing pin withdrawn from the jack post web.
  • Figure 10 is a sectional view taken on lines 10-40 of Figure 8 illustrating only the upper portion of the slidable jack head with other parts being broken away.
  • Figure 11 is a sectional view taken on lines 11--11 of Figure 8 with the upper climbing pin withdrawn from the jack post perforated web.
  • Figiiie 12 is a perspective view of a lift member being a hook attached thereto to illustrate the use of other kinds of lifting apparatus for various types of loads.
  • the slidable head 20 preferably comprises; the slidable housing 21, slidable guide member 22, toggle links having one end of each thereof pivotally connected to slidf able guide member 22 at 24 and the opposite end thereof being pivotally connected to lever 25 at '26, the lever 25 pivotally connected to slidable housing 21 on pin 7% en gageable climbing pin 27 slidably retained in housing 21, engage'ab'le climbing pin 28 slidably retained in guide merriher 22, compression springs 29 and 30 being around the engage'able climbing pins 27 and 28 respectively and being confined between the bracket ends 31 and 32 respectively and actuator pins 33 and 34 respectively, reversing cam member 35, reversing lever 36, and the actuating parts for moving the liftmembr upwardly, downwardly, or s'upport the lift member on the upright jack post 37 by the eiigageable climbing pins 27 and 23.
  • These parts are all old and a'r'e associated with the invention to illustrate an operable jack slidable head 20
  • the upright jack post 37 is provided with the usual perforated web 38 for the climbing pins '27 and 28.
  • An upright handle 39 is attachedto the upper portion of the upright ja'ck post 37 with the belt or rivet 40;
  • the handle projects above the post 37 and both are preferably aligned by means of their longitudinal axes. A person may grasp this handle with one hand and lift it for changing locations thereof and the handle is also convenient for pulling or pushing the jack on its wheel-s 52.
  • a pair of flat, horizontal and elongated base plates 41 are spaced parallel, the front ends 42 thereof being designated the toe and the opposite ends 43 being designated the heel.
  • a pair of support plates 44 are each bent flatwise into a U shape. Each support plate has the curved portion of the U shape secured to the lower end of the jack post perforated web 38 by bolt 45.
  • the pair of U-shaped support plates 44 are bolted on opposite sides of the jack post perforated web 38.
  • a pair of side plates 46 are provided with one located along the outside longitudinal edge 47 of each base plate 41.
  • front lower edge $8 of each support plate 44 is located intermediately between the toe 42 and heel 43 of the respective base plate 41 and the rear lower edge 49 of the support plate is located along or near the heel 43.
  • the support plates 44 have their outer ends secured to the side plates 46 and the lower edges secured to the base plates 41.
  • the lower edges of the side plates 46 are secured to the respective base plates along the outer edges thereof with the front edge of each located intermediately between the toe and the front of the U-shaped support plates.
  • the side plates 56 continue rearwardly at 50 past the support plates 44 and each is provided with a stub axle or bolt 51 projected outward sidewise or transversely to support a wheel 52.
  • the plates are all secured together or attached preferably by welding or may be cast together without departure from the invention.
  • the stub axles or bolts 51 are located above the bottom of the base plates 41 a greater distance than the outside radius of the wheels 52 so that the jack may rest on the base plates 41 when in an upright position and being used to raise or lower objects.
  • An upright channel 53 having a web 54 spacing its flanges 55 is secured to the slidable jack head 2%.
  • the Web 54 is secured by casting or welding to the front of the jack head 20 and the flanges 55 are projected forward.
  • the top of the web 54 has flanges 55 secured to the upper portion of the slidable jack head 2% and the channel 53 extends downward below the bottom of the slidable jack head 20 a sutficient distance to touch the floor or pavement on which the base plates rest when the slidable jack head 20 is lowered on the jack post and positioned above the support plates 44.
  • the flanges 55 of the channel 53 are provided with holes, openings or preferably slots 56 aligned in horizontal pairs and spaced vertically for quick major adjustment without using the jack handle.
  • the lift means or plate 57 is flat, horizontal and has an upright member 58 secured thereto and provided With projected upright ribs 59 preferably arranged to enter between the flanges 55. However the ribs may be positioned outside of the channel if desired.
  • This lift means 57 is designated upright as illustrated in Figure l and inverted as illustrated in Figures 3 and 4. Holes 60 are aligned horizontal in the ribs and are spaced near the ends of the ribs to receive the bolt 61 in the upper holes 60 of the ribs 59 Whether the lift means is upright or inverted.
  • the bolt 61 is sufliciently long enough to enter the slots 56 and support the lift member either in an upright or an inverted position.
  • a space lug 71 is secured to the lower portion of channel 53.
  • FIG 12 illustrates a modified form of the lift means.
  • the lift means plate 57 is preferably flat, horizontal and has an upright member 58' secured thereto and is provided with upright ribs or flanges 59' preferably arranged to enter between the flanges 55. Holes 60' are aligned horizontally in the flanges or ribs 59 and are spaced near the ends of the flanges or ribs to receive the bolt 61 in the upper holes 60'.
  • a hook 62 is secured to the plate 57' for a modified form of lift means.
  • a gusset plate 63 is secured to plate 57 and upright member 58'.
  • the lift member may be quickly changed in elevation by means of the bolt 61 and slots 56 in the channel flanges 55 to facilitate a quick adjustment.
  • the jack may be tilted on the heel thereof to be supported on the wheels 52 for moving about the floor or pavement.
  • An invertible lift member comprising: a vertical elongated plate, a horizontal plate, said horizontal plate being secured to one side of said vertical plate near one end thereof, vertical ribs, said vertical ribs being secured to the opposite side of said vertical plate, said vertical ribs having spaced transverse holes therethrough, a bolt, said bolt being in the upper spaced holes of said ribs, a slidable jack head, a pair of upright flanges projected from said slidable jack head, said pair of upright flanges having transverse openings therein spaced vertically, said bolt being sufficiently long enough to engage selected openings in said upright flanges, and the openings in said upright flanges detachably securing said bolt in said upright flanges.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Handcart (AREA)

Description

March 1957 A. H. BOTTORFF INVERTIBLE LIFT MEMBER WITH SLIDABLE JACK HEAD 2 Sheets-Sheet 1 Filed July 11, 1955 I:. IIIII FIGURE FIGURE 5.
INVENTOR ALBERT H. BOTTORFF.
AT T Y.
FIGURE 2.
March 26, 1957 A. H. BOTTORFF 2,735,650
INVERTIBLEI LIFT MEMBER WITH SLIDABLEI JACK HEAD Filed July 11, 1955 2 SheetsSheet 2 I I 2 I I I L I p \i 1 I 7 L f lLHH! i I 22 24 Lill fi 6 W 1 35 Hul H. I "I I I I l w w l ":4 2 W 23 FIGURE 6.
i w 3% 34 \x\ 237' E'" III 3 22 I 32 l I I'll I' I I 35 C 37 as 23 FIGURE 9. FIGURE IO.
FIGURE u.
INVENTOR AT TY.
ALBERT H. BOTTORFF.
United States Patent Ofi ice 2,786,650 Patented Mar. 26, 1957 INVERTIBLE LIFT MEMBER WITH SLIDABLE JACK HEAD Albert H. Bottorlf, St. Joseph, Mo. Application July 11, 195$,Sena1N0. 521,249
1 Claim. (or. 254- 434 This invention relates to an improvement in a jack and more particularly to an invertible lift member with means for rapid primary adjustment.
An advantage of the presentimproved invention is to provide a slidable jack head with a front vertical channel shape member secured thereto and extended below the jack head and have means to receive an invertible lift member. The invertible lift member or plate ma be manually and rapidly changed from a lowered floor level position on the channel shape member so as to be inserted below an article to be lifted, to a selected position of vertically spaced support positions on the channel for different types of objects to be lifted or lowered.
With this primary advantage the improved invertible lift member with the slidable jack head will be more fully understood from the accompanying drawings, this specification and the claims appended.
in the drawings:
Figure l is a perspective view of the improved jack illustrating the front and left side thereof, the base plates and lift means or plate being on the floor in the lowered position.
Figure 2 is an enlarged sectional fragmentary view taken on lines 2-2 of Figure rotated clock-wise 90 degrees to illustrate the lower portion of the perforated web of the jack post in an upright manner bolted to the support plates.
Figure 3 is a perspective view illustrating the lift means or lift plate in an inverted position, from that shown in Figure l, with the integral upright member turned downward and the connection ribs projected therefrom.
Figure 4 is a perspective view of the improved jack illustrating the left side and rear thereof, the lift member being in the inverted position and the slidable head raised to an intermediate height on the jack post.
Figure 5 is a sectional view taken on lines 55 of Figure 1 and rotated clock-wise a few degrees to illustrate a plan View of the pair of base plates with support plates secured thereto and bolted to the section of the jack post, the sideplates and wheels are secured thereto.
Figure 6 is an enlarged side view of the slidable jack head mounted on a fragment of the jack post, and part of the jack handle is broken away.
Figure 7 is a sectional view taken on lines 7-7 of Figure 6 illustrating only the latch and a portion of the jack handle.
Figure 8 is a rear view of the slidable jack head with a portion of the jack post being broken away above and below the slidable jack head.
Figure 9 is a sectional view taken on lines 99 of Figure 8 with the climbing pin withdrawn from the jack post web.
Figure 10 is a sectional view taken on lines 10-40 of Figure 8 illustrating only the upper portion of the slidable jack head with other parts being broken away.
Figure 11 is a sectional view taken on lines 11--11 of Figure 8 with the upper climbing pin withdrawn from the jack post perforated web.
Figiiie 12 is a perspective view of a lift member being a hook attached thereto to illustrate the use of other kinds of lifting apparatus for various types of loads.
The slidable head 20 preferably comprises; the slidable housing 21, slidable guide member 22, toggle links having one end of each thereof pivotally connected to slidf able guide member 22 at 24 and the opposite end thereof being pivotally connected to lever 25 at '26, the lever 25 pivotally connected to slidable housing 21 on pin 7% en gageable climbing pin 27 slidably retained in housing 21, engage'ab'le climbing pin 28 slidably retained in guide merriher 22, compression springs 29 and 30 being around the engage'able climbing pins 27 and 28 respectively and being confined between the bracket ends 31 and 32 respectively and actuator pins 33 and 34 respectively, reversing cam member 35, reversing lever 36, and the actuating parts for moving the liftmembr upwardly, downwardly, or s'upport the lift member on the upright jack post 37 by the eiigageable climbing pins 27 and 23. These parts are all old and a'r'e associated with the invention to illustrate an operable jack slidable head 20. Other types of operable jack heads may be used without departure from the improved inventioii.
The upright jack post 37 is provided with the usual perforated web 38 for the climbing pins '27 and 28. An upright handle 39 is attachedto the upper portion of the upright ja'ck post 37 with the belt or rivet 40; The handle projects above the post 37 and both are preferably aligned by means of their longitudinal axes. A person may grasp this handle with one hand and lift it for changing locations thereof and the handle is also convenient for pulling or pushing the jack on its wheel-s 52.
A pair of flat, horizontal and elongated base plates 41 are spaced parallel, the front ends 42 thereof being designated the toe and the opposite ends 43 being designated the heel. A pair of support plates 44 are each bent flatwise into a U shape. Each support plate has the curved portion of the U shape secured to the lower end of the jack post perforated web 38 by bolt 45. The pair of U-shaped support plates 44 are bolted on opposite sides of the jack post perforated web 38. A pair of side plates 46 are provided with one located along the outside longitudinal edge 47 of each base plate 41. The
. front lower edge $8 of each support plate 44 is located intermediately between the toe 42 and heel 43 of the respective base plate 41 and the rear lower edge 49 of the support plate is located along or near the heel 43. The support plates 44 have their outer ends secured to the side plates 46 and the lower edges secured to the base plates 41. The lower edges of the side plates 46 are secured to the respective base plates along the outer edges thereof with the front edge of each located intermediately between the toe and the front of the U-shaped support plates. The side plates 56 continue rearwardly at 50 past the support plates 44 and each is provided with a stub axle or bolt 51 projected outward sidewise or transversely to support a wheel 52. The plates are all secured together or attached preferably by welding or may be cast together without departure from the invention.
The stub axles or bolts 51 are located above the bottom of the base plates 41 a greater distance than the outside radius of the wheels 52 so that the jack may rest on the base plates 41 when in an upright position and being used to raise or lower objects.
An upright channel 53 having a web 54 spacing its flanges 55 is secured to the slidable jack head 2%. The Web 54 is secured by casting or welding to the front of the jack head 20 and the flanges 55 are projected forward. The top of the web 54 has flanges 55 secured to the upper portion of the slidable jack head 2% and the channel 53 extends downward below the bottom of the slidable jack head 20 a sutficient distance to touch the floor or pavement on which the base plates rest when the slidable jack head 20 is lowered on the jack post and positioned above the support plates 44.
The flanges 55 of the channel 53 are provided with holes, openings or preferably slots 56 aligned in horizontal pairs and spaced vertically for quick major adjustment without using the jack handle.
The lift means or plate 57 is flat, horizontal and has an upright member 58 secured thereto and provided With projected upright ribs 59 preferably arranged to enter between the flanges 55. However the ribs may be positioned outside of the channel if desired. This lift means 57 is designated upright as illustrated in Figure l and inverted as illustrated in Figures 3 and 4. Holes 60 are aligned horizontal in the ribs and are spaced near the ends of the ribs to receive the bolt 61 in the upper holes 60 of the ribs 59 Whether the lift means is upright or inverted. The bolt 61 is sufliciently long enough to enter the slots 56 and support the lift member either in an upright or an inverted position. A space lug 71 is secured to the lower portion of channel 53.
Figure 12 illustrates a modified form of the lift means. The lift means plate 57 is preferably flat, horizontal and has an upright member 58' secured thereto and is provided with upright ribs or flanges 59' preferably arranged to enter between the flanges 55. Holes 60' are aligned horizontally in the flanges or ribs 59 and are spaced near the ends of the flanges or ribs to receive the bolt 61 in the upper holes 60'. A hook 62 is secured to the plate 57' for a modified form of lift means. A gusset plate 63 is secured to plate 57 and upright member 58'.
It is obvious that the lift member may be quickly changed in elevation by means of the bolt 61 and slots 56 in the channel flanges 55 to facilitate a quick adjustment. The jack may be tilted on the heel thereof to be supported on the wheels 52 for moving about the floor or pavement.
What I claim as new and desire to secure by Letters Patent, is:
An invertible lift member comprising: a vertical elongated plate, a horizontal plate, said horizontal plate being secured to one side of said vertical plate near one end thereof, vertical ribs, said vertical ribs being secured to the opposite side of said vertical plate, said vertical ribs having spaced transverse holes therethrough, a bolt, said bolt being in the upper spaced holes of said ribs, a slidable jack head, a pair of upright flanges projected from said slidable jack head, said pair of upright flanges having transverse openings therein spaced vertically, said bolt being sufficiently long enough to engage selected openings in said upright flanges, and the openings in said upright flanges detachably securing said bolt in said upright flanges.
References Cited in the file of this patent UNITED STATES PATENTS 1,038,520 Beck Sept. 17, 1912 2,504,201 Johnson Apr. 18, 1950 FOREIGN PATENTS 697,233 Great Britain Sept. 16, 1953 720,133 Great Britain Dec. 14, 1954
US521249A 1955-07-11 1955-07-11 Invertible lift member with slidable jack head Expired - Lifetime US2786650A (en)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008691A (en) * 1958-05-14 1961-11-14 Bethlehem Steel Corp Pile jacking apparatus
US3073570A (en) * 1958-11-03 1963-01-15 Richard E Harvey Lifting jack frame
US3110475A (en) * 1962-04-09 1963-11-12 Auto Specialties Mfg Co Lifting jack
US3749361A (en) * 1972-03-01 1973-07-31 P Johnson Mechanical jack
US4379546A (en) * 1981-01-19 1983-04-12 Bloomfield Manufacturing Co., Inc. Lifting jack
US4846443A (en) * 1988-07-13 1989-07-11 Harvey C. Collins Floor covering installation tool
US5181694A (en) * 1992-04-08 1993-01-26 Collins Harvey C Floor covering installation tool
US5299779A (en) * 1993-03-01 1994-04-05 Collins Harvey C Floor covering installation method
US5711512A (en) * 1996-09-09 1998-01-27 Malcom P. Hammond Lifting jack
US6695290B1 (en) 1999-10-29 2004-02-24 O'connell Timothy E. Lifting jack accessory
US20100264387A1 (en) * 2009-04-15 2010-10-21 Julio Realegeno-Amaya Partition Lifter
EP1711288B1 (en) 2004-02-05 2014-04-09 Newfrey LLC Joining apparatus
US20150001453A1 (en) * 2013-06-26 2015-01-01 Larin Corporation Jack for lifting small utility vehicles
USD866911S1 (en) * 2017-06-16 2019-11-12 Arb Corporation Limited Jack
CN111587165A (en) * 2018-02-16 2020-08-25 维京装备公司 Hand-held jacking/leveling tool
US11225225B2 (en) * 2017-06-12 2022-01-18 Ideal Warehouse Innovations Inc. Portable trailer stand

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1038520A (en) * 1911-04-21 1912-09-17 Harry J Beck Valve-remover.
US2504201A (en) * 1945-07-28 1950-04-18 Claude H Johnson Lifting jack
GB697233A (en) * 1950-05-08 1953-09-16 Kwikform Ltd Improvements in or relating to adjustable shores or struts
GB720133A (en) * 1952-10-28 1954-12-15 Nancy Stephenson Improvements in or relating to adjustable bracket supports for display and other purposes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1038520A (en) * 1911-04-21 1912-09-17 Harry J Beck Valve-remover.
US2504201A (en) * 1945-07-28 1950-04-18 Claude H Johnson Lifting jack
GB697233A (en) * 1950-05-08 1953-09-16 Kwikform Ltd Improvements in or relating to adjustable shores or struts
GB720133A (en) * 1952-10-28 1954-12-15 Nancy Stephenson Improvements in or relating to adjustable bracket supports for display and other purposes

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008691A (en) * 1958-05-14 1961-11-14 Bethlehem Steel Corp Pile jacking apparatus
US3073570A (en) * 1958-11-03 1963-01-15 Richard E Harvey Lifting jack frame
US3110475A (en) * 1962-04-09 1963-11-12 Auto Specialties Mfg Co Lifting jack
US3749361A (en) * 1972-03-01 1973-07-31 P Johnson Mechanical jack
US4379546A (en) * 1981-01-19 1983-04-12 Bloomfield Manufacturing Co., Inc. Lifting jack
US4846443A (en) * 1988-07-13 1989-07-11 Harvey C. Collins Floor covering installation tool
US5181694A (en) * 1992-04-08 1993-01-26 Collins Harvey C Floor covering installation tool
US5299779A (en) * 1993-03-01 1994-04-05 Collins Harvey C Floor covering installation method
US5711512A (en) * 1996-09-09 1998-01-27 Malcom P. Hammond Lifting jack
US7000902B1 (en) 1999-10-29 2006-02-21 O'connell Timothy E Lifting jack accessory
US6695290B1 (en) 1999-10-29 2004-02-24 O'connell Timothy E. Lifting jack accessory
EP1711288B1 (en) 2004-02-05 2014-04-09 Newfrey LLC Joining apparatus
EP1711288B2 (en) † 2004-02-05 2018-02-28 Newfrey LLC Joining apparatus
US20100264387A1 (en) * 2009-04-15 2010-10-21 Julio Realegeno-Amaya Partition Lifter
US8132788B2 (en) * 2009-04-15 2012-03-13 Julio Realegeno-Amaya Partition lifter
US20150001453A1 (en) * 2013-06-26 2015-01-01 Larin Corporation Jack for lifting small utility vehicles
US9637362B2 (en) * 2013-06-26 2017-05-02 Larin Corporation Jack for lifting small utility vehicles
US11225225B2 (en) * 2017-06-12 2022-01-18 Ideal Warehouse Innovations Inc. Portable trailer stand
USD866911S1 (en) * 2017-06-16 2019-11-12 Arb Corporation Limited Jack
CN111587165A (en) * 2018-02-16 2020-08-25 维京装备公司 Hand-held jacking/leveling tool
KR20200123415A (en) * 2018-02-16 2020-10-29 바이킹 암 에이에스 Handheld Jacking/Leveling Tool
US20210024336A1 (en) * 2018-02-16 2021-01-28 Viking Arm AS Handheld jacking/levelling-tool

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