US3921471A - Overload prevention handle - Google Patents
Overload prevention handle Download PDFInfo
- Publication number
- US3921471A US3921471A US540004A US54000475A US3921471A US 3921471 A US3921471 A US 3921471A US 540004 A US540004 A US 540004A US 54000475 A US54000475 A US 54000475A US 3921471 A US3921471 A US 3921471A
- Authority
- US
- United States
- Prior art keywords
- extension portion
- body portion
- handle
- axis
- extension
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G1/00—Controlling members, e.g. knobs or handles; Assemblies or arrangements thereof; Indicating position of controlling members
- G05G1/04—Controlling members for hand actuation by pivoting movement, e.g. levers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20576—Elements
- Y10T74/20582—Levers
- Y10T74/20612—Hand
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20576—Elements
- Y10T74/20582—Levers
- Y10T74/20612—Hand
- Y10T74/20618—Jointed
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20576—Elements
- Y10T74/20582—Levers
- Y10T74/2063—Stops
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20576—Elements
- Y10T74/20732—Handles
Definitions
- ABSTRACT A handle particularly adapted to prevent overloading of chain hoists operated thereby.
- the handle has an [52] US CL zgg g zg g operator grasping extension portion pivotally su [51] Int C12 GOSG 1/04' B25B 23/142 ported on the main body portion of the handle, a spring device deformable to permit movement of the [58] Field of Search $355238, extension portion relative m the main body portion whenever a hoist overload condition producing operating force is applied to the extension portion, and an [56] References Cited improved connection between the extension portion UNITED STATES PATENTS nd spring device.
- This prior handle construction basically includes an extension portion pivotally supported on a main body portion of the handle, which is in turn adapted to be suitably connected to the hoist mechanism to be operated. Pivotal movement of the extension portion relative to the main body portion is normally prevented by a constraining device, which may be in the form of a stack of Belleville type spring discs; a roller being employed to operably interconnect the extension portion and a spring compression member.
- a constraining device which may be in the form of a stack of Belleville type spring discs
- a roller being employed to operably interconnect the extension portion and a spring compression member.
- the present invention is directed to an improvement I in an overload prevention handle of the type disclosed in US. Pat. No. 3,722,316. More particularly, the present invention provides for improved handle operating characteristics by employing a slipper connection between the extension and Belleville spring operating members.
- the present construction featuring the utilization of the slipper for controlling compression of a stack of Belleville spring discs possesses particular advantages including consistency and controllability of the operating of the handle.
- FIG. 1 is a side view of a preferred embodiment of the overload prevention handle of the present invention showing it mounted on a chain hoist to be operated thereby;
- FIG. 2 is a fragmentary, sectionalized view of the handle shown in FIG. 1;
- FIG. 3 is a sectional view taken generally along line 3-3 in FIG. 2;
- FIG. 4 is a view similar to FIG. 2 but showing the operator hand grip or extension portion of the handle in overload position.
- Hoist 12 may be of any conventional construction, such as for instance a chain hoist of the type having a hub portion 14 adapted to mount handle 10 for hoist operating pivotal movements about an axis defined by the hub portion.
- any suitable means may be employed to drivingly interconnect handle 10 with hub portion 14, such as a hub portion receiving circular recess 17 and an associated indexing pawl mechanism, not shown, the latter being removably receivable within cooperating hub portion recesses, also not shown.
- handle 10 includes a main body portion 20, which is formed adjacent one end thereof with opening 17 and serves to mount the abovementioned pawl mechanism; an extension or operator hand grip portion 22, which is carried adjacent another end of body portion 20 by a pin shaft 24 for relative pivotal movement about a second axis disposed essentially parallel to the axis of hub portion 14, that is, the axis about which the handle turns or swings; and a con straining device 26.
- Constraining device 26 normally serves to bias extension portion 22 into a normal or operating position relative to body portion 20, as shown in full line in FIGS. 1 and 2, but permits pivotal movement of the extension portion about the axis of pin shaft 24 into an overload position, shown in FIG. 4, whenever an operator applies a predetermined operating force F thereto.
- such predetermined operating force is intermediate that force which will permit the hoist to be operated at its rated load capacity and that force which would result in overloading of the hoist.
- pivotal movement of the extension portion 22 provides a clear visual indication to the hoist operator that a hoist overload condition is about to be encountered, and serves to reduce the moment arm through which the operating force is applied, thereby to proportionally increase the operating force required to apply to the same load to the hoist.
- body portion 20 is in the form of a metal casting having a side opening cavity 30, and end opening cavity or recess 32 and a through bore opening 34, which extends in a direction lengthwise of the body portion for placing cavities 30 and 32 in communication.
- extension 22 extends outwardly from within recess 32 and pivot shaft 24 is end supported by a pair of opposite walls 32' bounding such recess.
- Constraining device 26 includes a first member 40, which is adjustably fixed to body portion 20 so as to extend into cavity 30 in substantial axial alignment with opening 34; a second member 42, which is slideably received within opening 34 so as to have a first end portion extend into cavity 30 for slideably supported engagement with member 40 and a second end portion extend into cavity 32; and a stack of Belleville type spring washers or discs 44, which is carried by members 40 and 42 and compressible therebetween upon movement of member 42 towards member 40.
- the second end portion of member 42 is disposed to operatively bear on extension 22 in the manner to be described.
- Member 40 is threadably connected to body portion 20 for the purpose of adjustably pre-loading stack 44.
- the value of the predetermined operating force which will effect compression of stack 44 to permit pivotal movement of extension 22 into its overload position may be readily varied.
- stack 44 Upon removal of the predetermined operating force from handle extension 22, stack 44 will expand and serve to automatically return extension 22 to its normal operating positlOn.
- extension 22 is shown in FIGS. 2-4'as being formed with a partial, cylindrically shaped, concave recess 50, which opens towards the second end portion of member 42 and has its axis disposed parallel to the axis of pin shaft 24.
- a slipper or split-pin friction member 52 is formed with a partial cylindrically shaped bearing surface 54, which is dimensioned to be partially and rotatably accommodated within recess 50 and a lengthwise extending planar bearing surface 56 arranged is sliding face-to-face surface contact with a planar end surface 42a of member 42, which is disposed at right angles to the path of movement of such member.
- pivotal movements of extension 22 about the axis of pin shaft 24 result in simultaneous movements of slipper 52 relative to both the extension and member 42; the slipper rotating within recess 50 as it slides transversely across member end surface 42a. Displacements of the slipper axially from within recess 50 are prevented by bounding walls 32 of recess 32.
- friction braking effects of slipper 52 relative to both of surfaces 42a and 50 provides for smooth, self-damping movements of extension 22 as it is moved away from or returned to its operating position. Also, friction braking effects, which dissipate energy as opposed to storing energy, serve to permit a reduction in the value of spring force which would otherwise be required to releasably constrain the extension in its operating position and thus to reduce the value of stored spring force available to snap back the extension into its operating position upon accidental release thereof.
- a handle having a construction identical to that shown in the drawings and designed to operate in response to the application of an overload force of about 140 pounds only requires that an operator maintain a force of about 40 pounds on the extension to prevent its snapping-back into its normal position.
- extension 22 is formed with a pair of essentially planar abutment surfaces 60 and 62, which cooperatively engage with essentially planar main body portion recess and end stop surfaces 64 and 66 to define the operating and overload positions of the extension, as shown in FIGS. 2 and 4, respectively.
- Surfaces 60 and 62 are arranged essentially parallel to the axis of pivot pin 24 and arranged at a slightly obtuse angle relative to one another in order to permit face-to-face engagement with stop surfaces 64 and 66.
- slipper may be of a relatively small size, whereby the invention, which do not employ a slipper connec-v tion.
- a handle for preventing overloading of a handle operated mechanism by undergoing a change in shape upon application of a predetermined mechanism operating force thereto
- the handle includes an elongated main body portion having one end thereof adapted for operable connection to said mechanism for rotation about a first axis extending transversely of said body portion, an extension portion to which mechanism operating forces.are to be applied, pivot shaft means for mounting said extension portion on another end of said body portion for relative pivotal movement about a second axis arranged essentially parallel to said first axis, and constraining means for normally maintaining said extension portion in a normal mechanism operating position in substantial alignment with said body portion while releasing said extension portion for pivotal movement about said second axis away from said normal position into an overload position upon application of said predetermined operating force thereto, said constraining means tending to return said extension portion to said normal position from said overload position upon removal of said predetermined operating force therefrom, said constraining means including a stack of spring discs and means for mounting said discs on said body portion, said mounting means including first and
- a handle according to claim 1 wherein said extension portion is mounted to extend outwardly from within an end opening recess of said body portion, said pivot shaft means is end supported by a pair of opposite walls bounding said end opening recess, and said friction member is maintained within said concave recess against displacement axially thereof by said opposite walls.
- a handle according to claim 2 wherein said extension portion is formed with a pair of abutment surfaces arranged to alternatively engage with a pair of stop surfaces defined by said body portion to define said normal and overload positions.
Abstract
Description
Claims (3)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US540004A US3921471A (en) | 1975-01-10 | 1975-01-10 | Overload prevention handle |
CA220,000A CA1011326A (en) | 1975-01-10 | 1975-02-13 | Overload prevention handle |
JP50041142A JPS5181349A (en) | 1975-01-10 | 1975-04-04 | Kafukaboshihandoru |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US540004A US3921471A (en) | 1975-01-10 | 1975-01-10 | Overload prevention handle |
Publications (1)
Publication Number | Publication Date |
---|---|
US3921471A true US3921471A (en) | 1975-11-25 |
Family
ID=24153567
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US540004A Expired - Lifetime US3921471A (en) | 1975-01-10 | 1975-01-10 | Overload prevention handle |
Country Status (3)
Country | Link |
---|---|
US (1) | US3921471A (en) |
JP (1) | JPS5181349A (en) |
CA (1) | CA1011326A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2848886A1 (en) * | 1977-11-11 | 1979-05-17 | Kito Kawasaki Kk | OVERLOAD INDICATOR FOR A LEVER LIFT |
US4568054A (en) * | 1982-06-09 | 1986-02-04 | Compagnie Industrielle De Mecanismes | Seat mount for a motor vehicle |
FR2634294A1 (en) * | 1988-07-12 | 1990-01-19 | Danfoss As | ADJUSTABLE NEUTRAL POSITION CONTROL DEVICE |
US5277081A (en) * | 1992-10-26 | 1994-01-11 | Ford Motor Company | Force reversing and transmitting apparatus for a parking brake system |
US5301389A (en) * | 1993-04-26 | 1994-04-12 | Universal Tool & Stamping Company, Inc. | Jack handle with means for limiting the torque which can be applied to a jack |
US5337638A (en) * | 1993-02-11 | 1994-08-16 | Micro Motors, Inc. | Torque control ratchet wrench |
US6637287B2 (en) * | 2001-11-14 | 2003-10-28 | Roto Frank Of America, Inc. | Operator handle with overtorque protection |
US20030224325A1 (en) * | 2002-06-04 | 2003-12-04 | Ajay Kumar | Dental tool with rententive feature |
US20100256929A1 (en) * | 2009-04-03 | 2010-10-07 | Easco Hand Tools, Inc. | Electronic torque wrench with dual tension beam |
US20110162493A1 (en) * | 2010-01-04 | 2011-07-07 | Muniswamappa Anjanappa | Ratcheting device for an electronic torque wrench |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51127573U (en) * | 1975-04-11 | 1976-10-15 | ||
JPS51127574U (en) * | 1975-04-11 | 1976-10-15 | ||
JPS5470554A (en) * | 1977-11-12 | 1979-06-06 | Kito Corp | Overload indication lever for lever type hoist |
JPS61187542U (en) * | 1985-05-15 | 1986-11-22 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3140623A (en) * | 1961-08-29 | 1964-07-14 | Pendleton Tool Ind Inc | Predetermined torque release wrench |
US3633444A (en) * | 1969-06-30 | 1972-01-11 | Fimecor Fine Mecanique Sa | Machine for rotatably driving the bottom of a watch-casing or the bottom of a measuring apparatus |
US3722316A (en) * | 1971-08-23 | 1973-03-27 | Mc Kinnon C Corp | Overload prevention handle |
US3839928A (en) * | 1973-05-07 | 1974-10-08 | Pendleton Tool Ind Inc | Predetermined torque release wrench |
-
1975
- 1975-01-10 US US540004A patent/US3921471A/en not_active Expired - Lifetime
- 1975-02-13 CA CA220,000A patent/CA1011326A/en not_active Expired
- 1975-04-04 JP JP50041142A patent/JPS5181349A/en active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3140623A (en) * | 1961-08-29 | 1964-07-14 | Pendleton Tool Ind Inc | Predetermined torque release wrench |
US3633444A (en) * | 1969-06-30 | 1972-01-11 | Fimecor Fine Mecanique Sa | Machine for rotatably driving the bottom of a watch-casing or the bottom of a measuring apparatus |
US3722316A (en) * | 1971-08-23 | 1973-03-27 | Mc Kinnon C Corp | Overload prevention handle |
US3839928A (en) * | 1973-05-07 | 1974-10-08 | Pendleton Tool Ind Inc | Predetermined torque release wrench |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2848886A1 (en) * | 1977-11-11 | 1979-05-17 | Kito Kawasaki Kk | OVERLOAD INDICATOR FOR A LEVER LIFT |
US4568054A (en) * | 1982-06-09 | 1986-02-04 | Compagnie Industrielle De Mecanismes | Seat mount for a motor vehicle |
FR2634294A1 (en) * | 1988-07-12 | 1990-01-19 | Danfoss As | ADJUSTABLE NEUTRAL POSITION CONTROL DEVICE |
US5277081A (en) * | 1992-10-26 | 1994-01-11 | Ford Motor Company | Force reversing and transmitting apparatus for a parking brake system |
US5337638A (en) * | 1993-02-11 | 1994-08-16 | Micro Motors, Inc. | Torque control ratchet wrench |
US5301389A (en) * | 1993-04-26 | 1994-04-12 | Universal Tool & Stamping Company, Inc. | Jack handle with means for limiting the torque which can be applied to a jack |
US6637287B2 (en) * | 2001-11-14 | 2003-10-28 | Roto Frank Of America, Inc. | Operator handle with overtorque protection |
US20030224325A1 (en) * | 2002-06-04 | 2003-12-04 | Ajay Kumar | Dental tool with rententive feature |
US6951462B2 (en) | 2002-06-04 | 2005-10-04 | Zimmer Dental Inc. | Dental tool with rententive feature |
US20100256929A1 (en) * | 2009-04-03 | 2010-10-07 | Easco Hand Tools, Inc. | Electronic torque wrench with dual tension beam |
US8844381B2 (en) | 2009-04-03 | 2014-09-30 | Apex Brands, Inc. | Electronic torque wrench with dual tension beam |
US9308633B2 (en) | 2009-04-03 | 2016-04-12 | Apex Brands, Inc. | Electronic torque wrench with dual tension beam |
US20110162493A1 (en) * | 2010-01-04 | 2011-07-07 | Muniswamappa Anjanappa | Ratcheting device for an electronic torque wrench |
US8714057B2 (en) | 2010-01-04 | 2014-05-06 | Apex Brands, Inc. | Ratcheting device for an electronic torque wrench |
US9085072B2 (en) | 2010-01-04 | 2015-07-21 | Apex Brands, Inc. | Ratcheting device for an electronic torque wrench |
Also Published As
Publication number | Publication date |
---|---|
CA1011326A (en) | 1977-05-31 |
JPS5720238B2 (en) | 1982-04-27 |
JPS5181349A (en) | 1976-07-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SECURITY PACIFIC BUSINESS CREDIT INC., 1100 SUPERI Free format text: SECURITY INTEREST;ASSIGNOR:SOLUMBU MCKINNON CORPORATION, A CORP. OF NY;REEL/FRAME:004725/0001 Effective date: 19861223 |
|
AS | Assignment |
Owner name: GLENFED FINANCIAL CORPORATION, 104 CARNEGIE CENTER Free format text: SECURITY INTEREST;ASSIGNOR:COLUMBUS MCKINNON CORPORATION;REEL/FRAME:004760/0805 Effective date: 19861223 Owner name: GLENFED FINANCIAL CORPORATION,NEW JERSEY Free format text: SECURITY INTEREST;ASSIGNOR:COLUMBUS MCKINNON CORPORATION;REEL/FRAME:004760/0805 Effective date: 19861223 |
|
AS | Assignment |
Owner name: NORSTAR BANK, NATIONAL ASSOCIATION, NORSTAR BLDG., Free format text: SECURITY INTEREST;ASSIGNOR:COLUMBUS MCKINNON CORPORATION, A NY CORP.;REEL/FRAME:004777/0746 Effective date: 19861223 Owner name: NORSTAR BANK, NATIONAL ASSOCIATION,NEW YORK Free format text: SECURITY INTEREST;ASSIGNOR:COLUMBUS MCKINNON CORPORATION, A NY CORP.;REEL/FRAME:004777/0746 Effective date: 19861223 |
|
AS | Assignment |
Owner name: COLUMBUS MCKINNON CORPORATION, NEW YORK Free format text: PATENT RELEASE;ASSIGNOR:GLENFED FINANCIAL CORPORATION;REEL/FRAME:008186/0884 Effective date: 19961008 Owner name: COLUMBUS MCKINNON CORPORATION, NEW YORK Free format text: PATENT RELEASE;ASSIGNOR:BANK AMERICAN BUSINESS CREDIT, INC. AS SUCCESSOR TO SECURITY PACIFIC BUSINESS CREDIT INC.;REEL/FRAME:008186/0899 Effective date: 19961004 Owner name: COLUMBUS MCKINNON CORPORATION, NEW YORK Free format text: RELEASE AND TERMINATION OF COLLATERAL PATENT AND T;ASSIGNOR:FLEET BANK (FORMERLY KNOWN AS NORSTAR BANK, NATIONAL ASSOCIATION);REEL/FRAME:008194/0270 Effective date: 19961011 |