WO2011161488A1 - Bimanual ratchet wrench - Google Patents
Bimanual ratchet wrench Download PDFInfo
- Publication number
- WO2011161488A1 WO2011161488A1 PCT/IB2010/001539 IB2010001539W WO2011161488A1 WO 2011161488 A1 WO2011161488 A1 WO 2011161488A1 IB 2010001539 W IB2010001539 W IB 2010001539W WO 2011161488 A1 WO2011161488 A1 WO 2011161488A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bimanual
- ratchet wrench
- torque
- ratchet
- levers
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B13/00—Spanners; Wrenches
- B25B13/46—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle
- B25B13/461—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member
- B25B13/467—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member which are gear-operated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B13/00—Spanners; Wrenches
- B25B13/46—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle
- B25B13/461—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member
- B25B13/462—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member the ratchet parts engaging in a direction radial to the tool operating axis
- B25B13/463—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member the ratchet parts engaging in a direction radial to the tool operating axis a pawl engaging an externally toothed wheel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25G—HANDLES FOR HAND IMPLEMENTS
- B25G1/00—Handle constructions
- B25G1/04—Handle constructions telescopic; extensible; sectional
- B25G1/043—Handle constructions telescopic; extensible; sectional for screwdrivers, wrenches or spanners
Definitions
- the invention relates to manual screwing tools and in particular reversible ratchet wrenches, and more precisely to a ratchet wrench having two handles for combined or alternative operation.
- Ratchet Wrenches are widespread in mechanical construction and repair shops for safely loosening or tightening nuts and bolts.
- the here disclosed invention therefore refers to a ratchet with two handles, that may be operated together or alternatively. Thereby the deviating torque is neutralized and a reversing movement of bolt or nut overcome by holding one and turning the other handle or by counter-rotating one against the other.
- the second handle works on a secondary gear, mounted above the turning device. So both handles work in the same direction, but can be put on different angles, so to compensate the deviating torque.
- the invention comprises telescopically extendible levers, so to quickly change torque or angular travel as to given requirement.
- a secondary gearbox is positioned over a standard ratchet device.
- the action of a secondary lever above the main ratchet lever is thus transmitted from a secondary ratchet gearwheel, that is turned by the secondary lever with an extra pawl and translated to the main gearwheel (the one having the square bar shaft amidst) by another secondary gearwheel.
- the advantage here is, that the driving direction can be changed by reversing the toggeling pawl's engagement from one denticulation to the opposite section - as usual in the art.
- Fig. 1 demonstrates the here disclosed invention:
- Fig. la demonstrates the double gearbox type on a slanted view and Fig lb in top view, where the main ratchet 1 carries another lever 2 for combined action.
- Fig. lc explains in a cross-sectional view, how the ratcheting gearbox 3 with the lever for changing direction 4 work on the main ratcheting device 5 via a bolt 6: as the secondary lever 2 turns its cogwheel 7 with an engaged pawl 8 (not seen here) , the torque is transferred to the square 9 through the bolt 6 and the secondary gearwheel 11 fixed on it.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
The here disclosed invention therefore refers to a ratchet with two handles, that may be operated together oe alternatively. Thereby the deviating torque is neutralized and a reversing movement of bolt or nut overcome by holding one and turning the other handle or by counter- rotating one against the other. Here the second handle (2) works on a secondary gear (3), mounted above the turning device. So both handles work in the same direction, but can be put on different angles, so to compensate the deviating torque. Moreover, the invention comprises telescopically extendible levers, so to quickly change torque or angular travel as to given requirement.
Description
BIMANUAL RATCHET WRENCH
FIELD OF THE INVENTION
The invention relates to manual screwing tools and in particular reversible ratchet wrenches, and more precisely to a ratchet wrench having two handles for combined or alternative operation.
BACKGROUND OF THE INVENTION
Ratchet Wrenches are widespread in mechanical construction and repair shops for safely loosening or tightening nuts and bolts.
However, two drawbacks have been tried to be solved with a multitude of propositions, but still seem hardly overcome:
PROBLEMS TO BE SOLVED
1. Because the ratchet can only stop backward motion at discrete points (i.e., at tooth boundaries), a ratchet needs a defined amount of backward motion to lock in. But sometimes the space for moving the lever is so limited, that the possible angle for turning the bolt or nut therefore is not achieved. Consequently this backlash - which is limited to a maximum distance equal to the spacing between the teeth - must be minimized, and there are quite a few propositions covering this issue.
But, as early inventions propose finer ratchet gears, these inherit the drawback of less applicable torque, even more so with smooth, toothless ratchets with a high friction surface, or even rubber. Here the pawl mostly stays against the surface at an angle so that any backward motion will cause the pawl to jam against the surface and thus prevent any further backward motion. Since the backward travel distance here is primarily a function of the compressibility of the high friction surface, this mechanism can result in significantly reduced backlash— but quite limited torque.
2. At low torque levels, conventional ratchets may not trap, but alternate in both directions without fastening or finally turning out loose screws or bolts. This is a matter of force to overcome the ratcheting mechanism versus torque restraint of the nut or bolt, but of course as well the backlash problem, whereas each one conflicts with the other— and again solutions with friction mechanisms as in US 5.603.393 .result in poor maximum torque.
3. Since the ratchet works with snapped-on intermediate nuts, the applied torque from a single handle necessarily is not in line with the bolt-head or nut, but engages somewhat above it. This can lead to slipping off the screw head or nut, particularly with unskilled or poorly trained staff.
PRIOR ART
However, there had quite a few propositions been made to overcome these problems:
US 6.457.389 (B 1), 6.282.992 (B 1) to Hu, as well as US 6.230.591 (B 1) to Ling at al, 6.131.489 to Yang and US 6.230.591 (B l ) Ling try to solve the ratcheting problem with more elaborate pawl constructions to allow finer gauges and finer denticulation of the cogwheel, so to avoid the problem of less applicable torque. But these constructions demand much more precision in manufacturing and therefore are quite more expensive.
Other solutions, e.g. DE 10 2005 020 609 (A l) and US 7.213.491 (B2), where turning the transmitting nut by radially turning the lever around its axis, require an angle gear that must lock at standard action. These systems are known for being prone to defects when applying higher force, as long as the gearbox does not exceed manageable size.
One viable proposition is known from DE 10 2005 033 309 (A l) , where a second handle is locked in at 180° to the first one. But this is hardly applicable for ordinary purposes, since there must be enough space for both levers and enough room to turn it, which rarely is the case.
SUMMARY OF THE INVENTION
The here disclosed invention therefore refers to a ratchet with two handles, that may be operated together or alternatively. Thereby the deviating torque is neutralized and a reversing movement of bolt or nut overcome by holding one and turning the other handle or by counter-rotating one against the other.
Here the second handle works on a secondary gear, mounted above the turning device. So both handles work in the same direction, but can be put on different angles, so to compensate the deviating torque.
Moreover, the invention comprises telescopically extendible levers, so to quickly change torque or angular travel as to given requirement. DETAILED DESCRIPTION OF THE INVENTION
A secondary gearbox is positioned over a standard ratchet device. The action of a secondary lever above the main ratchet lever is thus transmitted from a secondary ratchet gearwheel, that is turned by the secondary lever with an extra pawl and translated to the main gearwheel (the one having the square bar shaft amidst) by another secondary gearwheel. The advantage here is, that the driving direction can be changed by reversing the toggeling pawl's engagement from one denticulation to the opposite section - as usual in the art.
GENERAL DESCRIPTION OF THE DRAWING
Fig. 1 demonstrates the here disclosed invention:
it shows a basic embodiment of a bimanual ratchet wrench in a) slanted view, b)top view and c) cut-off side view , where a secondary lever is working through an intermediate Gearbox onto the main axis with the driving bolt.
DETAILED DESCRIPTION OF THE DRAWINGS
Fig. la demonstrates the double gearbox type on a slanted view and Fig lb in top view, where the main ratchet 1 carries another lever 2 for combined action.
Fig. lc explains in a cross-sectional view, how the ratcheting gearbox 3 with the lever for changing direction 4 work on the main ratcheting device 5 via a bolt 6: as the secondary lever 2 turns its cogwheel 7 with an engaged pawl 8 (not seen here) , the torque is transferred to the square 9 through the bolt 6 and the secondary gearwheel 11 fixed on it.
Claims
1 . A bimanual ratchet wrench, comprising two levers, that can individually or together be turned to move a driving square or hex bolt for nuts.
2. A bimanual ratchet wrench as to claim 1 , comprising a piggyback secondary gear to connect the second lever's torque to a common driving bolt.
3. A bimanual ratchet wrench as to claim 1 , wherein the two levers are extendible.
4. A bimanual ratchet wrench as to claim 3, wherein telescopic extensions of the levers can be locked.
4. A bimanual ratchet wrench as to claim 4, wherein the locking of the extensions is executed by a choking clamp fixture.
5. A bimanual ratchet wrench as to claim 4, wherein the locking of the extensions is executed by a collet chuck-type fixture.
6. A bimanual ratchet wrench as to claim 4, wherein the locking of the extensions is executed by spring-suspendend notching.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IB2010/001539 WO2011161488A1 (en) | 2010-06-24 | 2010-06-24 | Bimanual ratchet wrench |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IB2010/001539 WO2011161488A1 (en) | 2010-06-24 | 2010-06-24 | Bimanual ratchet wrench |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011161488A1 true WO2011161488A1 (en) | 2011-12-29 |
Family
ID=43618685
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2010/001539 WO2011161488A1 (en) | 2010-06-24 | 2010-06-24 | Bimanual ratchet wrench |
Country Status (1)
Country | Link |
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WO (1) | WO2011161488A1 (en) |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1860914A (en) * | 1930-02-19 | 1932-05-31 | Mabel T Joseph | Ratchet wrench |
US2520443A (en) * | 1946-10-14 | 1950-08-29 | Albert L Seaquist | Planetary gear speed wrench |
US3828629A (en) * | 1973-05-09 | 1974-08-13 | Buell E | Multi-power ratchet wrenches |
CA1147176A (en) * | 1980-04-16 | 1983-05-31 | Fern St. Charles | Adjustable extension for socket wrenches or the like |
US5603393A (en) | 1993-10-12 | 1997-02-18 | Snap-On Technologies, Inc. | Ratchet head assembly and reversing knob therefor |
US6131489A (en) | 1999-11-16 | 2000-10-17 | Yang; Chin-Chun | Reversible wrench |
US6230591B1 (en) | 1999-07-30 | 2001-05-15 | Hand Tool Design Corporation | Reversible ratcheting tool with improved gear wheel/pawl engagement |
US6282992B1 (en) | 2000-02-03 | 2001-09-04 | Bobby Hu | Biasing arrangement for a pawl of a reversible ratchet-type wrench |
US6457389B1 (en) | 2000-08-22 | 2002-10-01 | Bobby Hu | Switching arrangement for a reversible ratchet type wrench |
DE102005020609A1 (en) | 2005-05-03 | 2006-11-16 | Bruno Gruber | Ratchet has handle connected to toothed ring with rotationally fixed effect, and ratchet has locking device which is switchable in freewheel direction by means of reversing lever or knurled wheel |
DE102005033309A1 (en) | 2005-07-16 | 2007-01-18 | Bruno Gruber | Ratchet arrangement with two handles e.g. for wrench, has ratchet having ratchet head, handle and in ratchet head drive taps with key, with second handle and key jaw provided which connect to ratchet head enclosure |
US7213491B1 (en) | 2004-07-16 | 2007-05-08 | Snap-On Incorporated | Ratcheting tool |
US20070131070A1 (en) * | 2005-12-14 | 2007-06-14 | Hull Ricky E | Tool having a telescoping handle |
CA2635425A1 (en) * | 2008-07-10 | 2010-01-10 | Jean-Jacques Guilbault | Telescopic wrench |
-
2010
- 2010-06-24 WO PCT/IB2010/001539 patent/WO2011161488A1/en active Application Filing
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1860914A (en) * | 1930-02-19 | 1932-05-31 | Mabel T Joseph | Ratchet wrench |
US2520443A (en) * | 1946-10-14 | 1950-08-29 | Albert L Seaquist | Planetary gear speed wrench |
US3828629A (en) * | 1973-05-09 | 1974-08-13 | Buell E | Multi-power ratchet wrenches |
CA1147176A (en) * | 1980-04-16 | 1983-05-31 | Fern St. Charles | Adjustable extension for socket wrenches or the like |
US5603393A (en) | 1993-10-12 | 1997-02-18 | Snap-On Technologies, Inc. | Ratchet head assembly and reversing knob therefor |
US6230591B1 (en) | 1999-07-30 | 2001-05-15 | Hand Tool Design Corporation | Reversible ratcheting tool with improved gear wheel/pawl engagement |
US6131489A (en) | 1999-11-16 | 2000-10-17 | Yang; Chin-Chun | Reversible wrench |
US6282992B1 (en) | 2000-02-03 | 2001-09-04 | Bobby Hu | Biasing arrangement for a pawl of a reversible ratchet-type wrench |
US6457389B1 (en) | 2000-08-22 | 2002-10-01 | Bobby Hu | Switching arrangement for a reversible ratchet type wrench |
US7213491B1 (en) | 2004-07-16 | 2007-05-08 | Snap-On Incorporated | Ratcheting tool |
DE102005020609A1 (en) | 2005-05-03 | 2006-11-16 | Bruno Gruber | Ratchet has handle connected to toothed ring with rotationally fixed effect, and ratchet has locking device which is switchable in freewheel direction by means of reversing lever or knurled wheel |
DE102005033309A1 (en) | 2005-07-16 | 2007-01-18 | Bruno Gruber | Ratchet arrangement with two handles e.g. for wrench, has ratchet having ratchet head, handle and in ratchet head drive taps with key, with second handle and key jaw provided which connect to ratchet head enclosure |
US20070131070A1 (en) * | 2005-12-14 | 2007-06-14 | Hull Ricky E | Tool having a telescoping handle |
CA2635425A1 (en) * | 2008-07-10 | 2010-01-10 | Jean-Jacques Guilbault | Telescopic wrench |
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