US3776514A - Overload regulator for lever hoists - Google Patents
Overload regulator for lever hoists Download PDFInfo
- Publication number
- US3776514A US3776514A US00138072A US3776514DA US3776514A US 3776514 A US3776514 A US 3776514A US 00138072 A US00138072 A US 00138072A US 3776514D A US3776514D A US 3776514DA US 3776514 A US3776514 A US 3776514A
- Authority
- US
- United States
- Prior art keywords
- hoist
- screw
- slot
- regulator
- section
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D3/00—Portable or mobile lifting or hauling appliances
- B66D3/12—Chain or like hand-operated tackles with or without power transmission gearing between operating member and lifting rope, chain or cable
Definitions
- the regulator is operably mounted between the drive input applied via an operating lever and the output drive on which a load is received and- /or contained.
- An adjustably presettable braking friction applied between coaxially interfit components rotationally connects the input and output drives. in the event the input driving force exceeds the imposed braking friction, the hoist is rendered inoperable to raise, pull or stretch the load but continues operable to lower or release the load.
- the field of art to which the invention pertains generally includes the art of article handling as specifically directed to hoisting, pulling, or stretching equipment having a torque limiting clutch mechanism for overload prevention.
- Hoists, and in particular hoists hand operated by means of a chain or ratchet lever for elevating or hauling articles or other similar type loads are extensively employed in many applications of industrial life.
- Noteworthy users are the chemical companies, the automotive companies, shipyards and others having operations requiring frequent hoisting, hauling, or moving of parts, cargo or the like.
- Each hoist when sold is built to a manufacturers specification for a rated load capacity within which the hoist is capable of being safely operated. When rated capacities are observed and the hoists are otherwise maintained they can be expected to provide many years of trouble free life.
- rated capacities are observed and the hoists are otherwise maintained they can be expected to provide many years of trouble free life.
- the hoist is employed for pulling or stretching, as opposed to mere raising of the load, it is most difficult for the operator to accurately predict the magnitude of load likely to be encountered. Consequently, in either instance the actual load to be encountered is not prejudged and it is not uncommon for the operator to judge safe operating capacity purely on the basis of whether the hoist can tolerate the load without apparent failure.
- the input driving force is limited only by the operators physical strength which, via the mechanical leverage provided by the chain or ratchet lever, permits misjudgment substantially greater than intended by the manufacturer.
- Hoist failure can of course result in load drop or release and consequent damage not least of which is personal injury or loss of life.
- Hoist failure from an inability to function at the onset of applied load e.g. elevate a load from the ground, produces minimal injury in that failure is immediately apparent to the operator and no load drop occurs.
- What frequently happens however to these hoists is a form of progressive failure from frequent overloading permitting an actual failure from a load even within rated hoist capacity. It can be well appreciated that this latter situation presents a real legal dilemma for the hoist manufacturer in determination of product liability.
- This invention relates to a regulator for hoists and particularly to regulators for hand lever hoists to han dle loads of various capacities on the order of l to 6 tons. More specifically, the invention relates to lever hoists having a load regulator whereby negligent operation of the hoist by input overloading in excess of predetermined limits over rated hoist capacity is substantially prevented. Consequently, a greater degree of legal protection after sale of the equipment is afforded a manufacturer by preventing this form of equipment abuse under field conditions otherwise beyond the manufacturers control. Not only does a hoist having a regulator in accordance with invention hereof minimize the possibility of overload within prescribed limits, but moderately incurred overload conditions will not result in load drop or release with consequent damage or personal injury.
- a hoist when constructed with the regulator hereof continues operable for lowering or releasing the load to, for example, ground or other safe level whereat the excess load can be removed.
- these results are obtained by an adjustably presettable braking friction applied between coaxially interfit components rotationally connecting the input and output drives of the hoist.
- FIG. 1 is an isometric view partially in section of a lever type hoist incorporating a first embodiment regulator assembly in accordance herewith;
- FIG. 2 is an axial elevation partially in section through the regulator assembly in the hoist of FIG. 1;
- FIG. 3 is an enlarged fragmentary section within the encircled portion of FIG. 2;
- FIG. 4 is a sectional elevation as viewed substantially along the lines 44 of FIG. 2;
- FIG. 5 is an axial elevation partially in section of the regulator assembly
- FIG. 6 is a left end elevation of the regulator assembly as viewed substantially along the lines 6-6 of FIG.
- FIG. 7 is a sectional elevation as viewed substantially along the lines 77 of FIG. 5;
- FIG. 8 is a right end elevation taken substantially along the lines 88 of FIG. 5;
- FIG. 9 is an axial elevation partially in section of a lever type hoist incorporating a second embodiment regulator assembly in accordance herewith;
- FIG. 10 is an axial elevation partially in section through the regulator assembly in the hoist of FIG. 9;
- FIG. 11 is a left end elevation of the regulator assembly as viewed substantially along the lines 1111 of FIG. 10;
- FIG. 12 is a right end elevation of the regulator assembly as viewed substantially along the lines 12l2 of FIG. 10;
- FIG. 13 is an enlarged fragmentary section of the encircled portion of FIG. 10.
- FIG. 1 there is illustrated a hand operated lever hoist designated 10 incorporating a first regulator embodiment in accordance herewith and generally designated 12.
- the hoist illustrated is of a type commercially available for rated load capacities on the order of i to 2 ton and is comprised of a generally cylindrical housing 14 from which extends an upstanding hook 15 for mounting the hoist onto a suitable overhead support.
- a chain 17 Suspended downward from housing 14 is a chain 17 to which at its terminal end there is secured a load hook 18 adapted for receiving a load to be raised or lowered as required.
- Input for normally operating the hoist either up or down is by means of a handoperated lever 19 which when cranked in a back and forth oscillating motion causes pawl 20 to engage ratchet 21 to in turn rotate hollow output shaft 22 through load brake 23 (FIG. 2) of the commonly used Weston type.
- Shaft 22 is in turn key connected to a coaxial output drive pinion 24 which translates rotational movement through gearing (not shown) in a conventional manner into a raising or lowering operation of chain 17 and hook 18 secured thereto.
- Operational direction of the hoist is controlled by a down or up setting of thumb lever 26. Intermediate free setting of thumb lever 26 permits free wheeling of the unloaded chain. While the chain is free wheeled brake 23 is maintained in open position by means of a plunger 31 urged by spring 32 into a detent cavity in brake hub (FIG. 2). Cap screw 33 secures spring 32 in compression against plunger 31.
- FIGS. 2-8 the regulator assembly 12 in accordance with a first embodiment hereof is shown comprised of a ratchet member 21 coaxially enclosing an axial portion of a brake-hub member 30.
- the brake-hub is helically interfit with knob 27 in turn keyed to shaft 22 by means of key 28 and secured against axially rightward movement thereon by retainer ring 29.
- Ratchet member 21 is formed as an annular sleeve or the like 34 of a relatively narrow axial width defined by radial end faces 35 and 36. Between end faces the width is divided into a large diameter on which are exten'orly formed ratchet teeth 37 and a smaller shouldered diameter 38 about which to receive an enclosing portion of lever 19.
- the sleeve is centrally bored to an internal diameter dimension 39 accurately turned concentric with the outside diameter of teeth 37.
- Brake-hub 30 is of an axial width greater than ratchet 21 defined by radial end face 42 and helix end face 43 adapted to cooperate with internal helix 46 of knob 27.
- the hub supports ratchet 21 and is of an initial outside diameter 44, at least where axially coextensive with ratchet 21, of on the order of a few thousanths less then internal ratchet diameter 39 in order to initially provide rotational freedom therebetween for purposes of assembly.
- End face 42 terminates in an enlarged annular flange juxtaposed to brake 23 and against which to receive ratchet end face 35.
- each of apertures 60 and 61 Received in each of apertures 60 and 61 is an elongated adjustment screw 62 which at its inward end terminates in a conically recessed cup 63 for engagement against ball 55.
- screw 62 As will be further explained below, tightened advancement of screw 62 against ball 55 forces the ball thereat against tapered sides of recess 54 to circumferentially spread axial slots 50 and 51. Spreading the latter slots radially expands hub diameter 44 into a predetermined frictional braking engagement against internal ratchet surface 39. The magnitude of frictional engagement can thereby be adjustably preset as required.
- surface 39 is preferably of a hard smooth finish as of hard chrome plate to which a thin film of lubricant has been applied.
- I-lub surface 44 is likewise machine smooth of good bearing material such as alloy bronze or the like.
- regulator 112 is described for sake of explanation, in conjunction with a hoist which, may for example, be of a type disclosed in US. Pat. No. 3,047,] 14 incorporated herein by reference, and which is generally suitable for greater loads than that which can be accommodated by hoist 10.
- Regulator 1 12 is enclosed within lever 119 and is normally effective when actuated by the lever and pawl 120 to rotate output shaft 122 for raising and lowering of load hook 118.
- shaft 122 includes an Acme brake thread 123 and is splined at 124 for receiving free wheeling knob 127.
- Thumb lever 126 controls whether lever 119 when cranked will raise or lower hook 118 or permit free wheel chain operation.
- Regulator 112 is formed of two components consisting of ratchet member 121 supported on brake-nut member 130.
- Ratchet member 121 is formed of a ringlike sleeve structure 134 of width defined between radial end faces 135 and 136 having ratchet teeth 137 uniformly contained about its annular periphery.
- the ratchet is centrally bored to an internal diameter 139 accurately concentric with the circumference of ratchet teeth 137.
- Brake-nut 130 is likewise annular of width greater than ratchet 121 defined between radial end faces 142 and 143 and is centrally bored and Acme threaded at 144 to cooperate with Acme thread 123.
- the axial periphery of brake-nut 130 is stepped from a smaller diameter 146 on which to receive ratchet 121 to a shoulder 147 connected with larger diameter 148.
- the outside diameter 146 is initially of a few thousanths less than internal ratchet diameter 139 in order to initially provide rotational freedom therebetween.
- radial slot 150 Formed as to circumferentially split the ring is radial slot 150 axially extending between end faces 142 and 143 in turn centrally bored and tapped at 151 and square counter slotted at 152. Contained within counterslot 152 is a square insert 153 threaded to receive the threaded end of tapered-head adjusting screw 154.
- each of the regulators are assembled on a suitable fixture fitted with proper measuring equipment. Thereafter either adjustment screw 62 or 154 as the case may be, is tightened down until diametrically expanding the brake hub into a predetermined rotational friction braking engagement with the centrally internal ratchet diameter which surrounds it.
- the force magnitude of radial braking engagement is determined by the load capacity of hoist with which the regulator is employed and the relative load level corresponding to or slightly above rated load capacity at which further loading of the hoist is to be prevented. In this manner, raising a load at capacities below the adjusted setting level of the regulator effects conjoint operation in unison between the brake hub and ratchet such that the hoist for all practical purposes operates in the manner of such hoists in the prior art.
- a regulator for limiting load drawing capacity of the hoist comprising:
- said first and second sections being arranged coaxially interfit one within the other with at least an axial portion of an outside diametral surface of the inner section adapted to be in frictional engagement with at least an axial portion of the internal diametral surface of the outer section and with the inner of said sections including at least one radial slot of predetermined axial extent having locally tapered surfaces in opposite walls at an intermediate location defining a locally enlarged recess therewithin;
- substantially inelastic sphere means contained within said slot recess;
- presettable screw adjustment means for effecting a rotational braking friction between said first and second rotatable sections to provide a predetermined degree of limited braking therebetween correlated to a value of load at which the hoist capacity is to be limited;
- said screw adjustment means including a screw threadedly supported in the wall of said inner section in axial alignment with the sphere means in said slot recess, the inward end of said screw being effective when operatively advanced in engagement against said sphere means for said sphere means to spread said slot increasing the outer diametral surface of said inner section against the inner diametral surface of said outer section.
- said inner section includes a plurality of said at least one radial slot displaced about the periphery each containing sphere means in the recess thereof and there is included a plurality of said screw adjustment means of like quantity as said slot plurality aligned in a one for one arrangement.
- a regulator for limiting load drawing capacity of the hoist comprising:
- first and second sections being arranged coaxially interfit one within the other with at least an axial portion of an outside diametral surface of the inner section adapted to be in frictional engagement with at least an axial portion of the internal diametral surface of the outer section and with the inner of said sections including at least one pair of spaced apart walls defining a radial slot of predetermined axial extent;
- presettable screw adjustment means for effecting a rotational braking friction between said first and second rotatable sections to provide a predetermined degree of limited braking therebetween correlated to a value of load at, which the hoist capacity is to be limited; said screw adjustment means including means having an axially tapered portion axially advanceable within said slot to efi'ect controlled spreading of said slot walls.
- said screw adjustment means comprises a screw and a nut coupled from opposite ends of said slot and one of which has an axially tapered portion to advance inwardly of said slot in response to a tightened force applied to said screw.
- a regulator for limiting load drawing capacity of the hoist including:
- adjustably presettable means for effecting a rotational braking friction between said first and second rotatable sections to provide a predetermined degree of limited braking therebetween correlated to a value of load at which the hoist capacity is to be limited;
- second braking means operative independent of said lever for controlling the release rate of a load received on said output means.
- said adjustable presettable regulator means comprises means for diametrically urging at least one of said diametral surfaces toward the other until achieving a desired predetermined degree of limited frictional braking therebetween.
- said adjustable presettable regulator means comprises screw actuated means operative when advanced in a tightening direction to effect said urging between said diametral surfaces.
- said inner regulator section contains means defining at least one radial slot of predetermined axial extent receiving the operative effect of said screw means to increasingly spread apart in response to screwed advancement thereof.
- said de fined regulator slot includes a locally enlarged recess at an intermediate location extending into the opposing walls thereof, and sphere means within said recess being engaged by the inward end of said screw means, said screw means being arranged extending axially into said slot radially coincident with said sphere means for applying a force thereagainst to effect controlled spreading of said slot walls.
- said inner section includes a plurality of said at least one radial slot displaced about the periphery each containing sphere means in the recess thereof and there is included a plurality of said screw means of like quantity as said slot plurality aligned in a one for one arrangement.
- said regulator screw means includes means having an axially tapered portion axially advancable within said slot to effect controlled spreading of said slot walls.
- said regulator screw means comprises a screw and a nut coupled from opposite ends of said slot and one of which has an axially tapered portion to advance inwardly of said slot in response to a tightening force applied to said screw.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
Description
Claims (22)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13807271A | 1971-04-28 | 1971-04-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3776514A true US3776514A (en) | 1973-12-04 |
Family
ID=22480308
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00138072A Expired - Lifetime US3776514A (en) | 1971-04-28 | 1971-04-28 | Overload regulator for lever hoists |
Country Status (3)
Country | Link |
---|---|
US (1) | US3776514A (en) |
JP (1) | JPS5332580B1 (en) |
CA (1) | CA965078A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2650424A1 (en) * | 1975-11-03 | 1977-05-05 | Eaton Corp | TORQUE TRANSMISSION AND DISPLAY DEVICE |
US4156521A (en) * | 1977-05-19 | 1979-05-29 | Eaton Corporation | Hoist with load brake having release mechanism therefor |
US4251060A (en) * | 1977-12-20 | 1981-02-17 | Kabushiki Kaisha Kito | Hand hoist |
US4474360A (en) * | 1982-06-09 | 1984-10-02 | Kabushiki Kaisha Kito | Idling device for lever hoist |
US4768754A (en) * | 1986-09-10 | 1988-09-06 | Vital Kogyo Kabushiki Kaisha | Manual hoist with overload preventer |
US5271608A (en) * | 1990-06-29 | 1993-12-21 | Nikko Kizai Co., Ltd. | Rope drawing winch |
US5344121A (en) * | 1991-04-05 | 1994-09-06 | Morris Baziuk | Safety winch |
US5538222A (en) * | 1992-08-17 | 1996-07-23 | H.H.H. Manufacturing Co. | Chain lever hoist |
US5971364A (en) * | 1997-05-14 | 1999-10-26 | Elephant Chain Block Co., Ltd. | Hoist and traction apparatus |
US7246790B1 (en) | 2006-05-05 | 2007-07-24 | Ulric Francoeur | Hoist System |
EP2441726A1 (en) * | 2010-08-18 | 2012-04-18 | Ningbo Baoli United Imp. & Exp. Co., Ltd. | Hoist |
EP2479133A3 (en) * | 2011-01-21 | 2013-01-16 | David Hunt | Load indicating lifting apparatus |
CN105858520A (en) * | 2016-05-07 | 2016-08-17 | 浙江双鸟机械有限公司 | Special manual tractor for placing plate component in position |
RU189693U1 (en) * | 2019-01-25 | 2019-05-30 | Николай Иванович Хабрат | Tal N.I. HABRAT |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1373810A (en) * | 1920-02-09 | 1921-04-05 | Clifford O Hansen | Friction-clutch |
US1554755A (en) * | 1924-07-23 | 1925-09-22 | Ingersoll Rand Co | Clutch coupling |
US1561506A (en) * | 1924-04-12 | 1925-11-17 | Aeromarine Plane & Motor Compa | Engine starter |
US1601438A (en) * | 1924-03-20 | 1926-09-28 | Gustaf A Gustafson | Friction safety drive |
US2793515A (en) * | 1955-05-20 | 1957-05-28 | Ampatco Lab Corp | Clutch |
US2889075A (en) * | 1954-05-27 | 1959-06-02 | Feedmatic Inc | Rotary device and torque transmission means therefor |
US3047114A (en) * | 1958-07-18 | 1962-07-31 | Manning Maxwell & Moore Inc | Hoist construction |
US3542341A (en) * | 1968-11-15 | 1970-11-24 | Dresser Ind | Hoist having load regulation |
-
1971
- 1971-04-28 US US00138072A patent/US3776514A/en not_active Expired - Lifetime
-
1972
- 1972-03-14 CA CA137,038A patent/CA965078A/en not_active Expired
- 1972-03-30 JP JP3214072A patent/JPS5332580B1/ja active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1373810A (en) * | 1920-02-09 | 1921-04-05 | Clifford O Hansen | Friction-clutch |
US1601438A (en) * | 1924-03-20 | 1926-09-28 | Gustaf A Gustafson | Friction safety drive |
US1561506A (en) * | 1924-04-12 | 1925-11-17 | Aeromarine Plane & Motor Compa | Engine starter |
US1554755A (en) * | 1924-07-23 | 1925-09-22 | Ingersoll Rand Co | Clutch coupling |
US2889075A (en) * | 1954-05-27 | 1959-06-02 | Feedmatic Inc | Rotary device and torque transmission means therefor |
US2793515A (en) * | 1955-05-20 | 1957-05-28 | Ampatco Lab Corp | Clutch |
US3047114A (en) * | 1958-07-18 | 1962-07-31 | Manning Maxwell & Moore Inc | Hoist construction |
US3542341A (en) * | 1968-11-15 | 1970-11-24 | Dresser Ind | Hoist having load regulation |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2650424A1 (en) * | 1975-11-03 | 1977-05-05 | Eaton Corp | TORQUE TRANSMISSION AND DISPLAY DEVICE |
US4156521A (en) * | 1977-05-19 | 1979-05-29 | Eaton Corporation | Hoist with load brake having release mechanism therefor |
US4251060A (en) * | 1977-12-20 | 1981-02-17 | Kabushiki Kaisha Kito | Hand hoist |
US4474360A (en) * | 1982-06-09 | 1984-10-02 | Kabushiki Kaisha Kito | Idling device for lever hoist |
US4768754A (en) * | 1986-09-10 | 1988-09-06 | Vital Kogyo Kabushiki Kaisha | Manual hoist with overload preventer |
BE1001836A4 (en) * | 1986-09-10 | 1990-03-20 | Vital Chain Block Mfg | Manual lift unit. |
US5271608A (en) * | 1990-06-29 | 1993-12-21 | Nikko Kizai Co., Ltd. | Rope drawing winch |
US5344121A (en) * | 1991-04-05 | 1994-09-06 | Morris Baziuk | Safety winch |
US5538222A (en) * | 1992-08-17 | 1996-07-23 | H.H.H. Manufacturing Co. | Chain lever hoist |
US5971364A (en) * | 1997-05-14 | 1999-10-26 | Elephant Chain Block Co., Ltd. | Hoist and traction apparatus |
US7246790B1 (en) | 2006-05-05 | 2007-07-24 | Ulric Francoeur | Hoist System |
EP2441726A1 (en) * | 2010-08-18 | 2012-04-18 | Ningbo Baoli United Imp. & Exp. Co., Ltd. | Hoist |
EP2441726A4 (en) * | 2010-08-18 | 2013-04-10 | Ningbo Baoli United Imp & Exp Co Ltd | Hoist |
EP2479133A3 (en) * | 2011-01-21 | 2013-01-16 | David Hunt | Load indicating lifting apparatus |
CN105858520A (en) * | 2016-05-07 | 2016-08-17 | 浙江双鸟机械有限公司 | Special manual tractor for placing plate component in position |
RU189693U1 (en) * | 2019-01-25 | 2019-05-30 | Николай Иванович Хабрат | Tal N.I. HABRAT |
Also Published As
Publication number | Publication date |
---|---|
CA965078A (en) | 1975-03-25 |
JPS5332580B1 (en) | 1978-09-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3776514A (en) | Overload regulator for lever hoists | |
US4664357A (en) | Overload avoiding arrangement for a hoist | |
US4102295A (en) | Load indicating apparatus | |
US2501096A (en) | Clutch and brake for hoists | |
US4768754A (en) | Manual hoist with overload preventer | |
US4042213A (en) | Electric hoist | |
US5217084A (en) | Load limiting apparatus for a hoist | |
US3679012A (en) | Assembly of block pulleys provided with a load measuring system | |
US2690240A (en) | One-way brake with axially moving detent | |
IT9019538A1 (en) | SAFETY DEVICE FOR A LIFTING EQUIPMENT OR SIMILAR | |
US3921471A (en) | Overload prevention handle | |
US3741527A (en) | Stress limiting hoist | |
GB1156088A (en) | Hoist Overload Preventing Device. | |
US9994433B2 (en) | Brake/clutch device for manual hoist | |
US3203672A (en) | Load indicating device | |
US3018677A (en) | Cartridge-type spring-bias means for a predetermined torque release wrench | |
US4156521A (en) | Hoist with load brake having release mechanism therefor | |
US4065100A (en) | Hoist load brake | |
US3722316A (en) | Overload prevention handle | |
US2802636A (en) | Portable winch | |
US3953000A (en) | Hoist with load limiting device | |
US4325470A (en) | Hoist overload clutch | |
US3542341A (en) | Hoist having load regulation | |
US5150768A (en) | Load limiting apparatus for a hoist | |
CN111017806A (en) | Antiskid type hydraulic forklift with overload alarming function |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: BARCLAYSAMERICAN/ BUSINESS CREDIT, INC. 530 NORTH Free format text: SECURITY INTEREST;ASSIGNOR:LIFT-TECH INTERNATIONAL INC. A CORP. OF MI;REEL/FRAME:004539/0067 Effective date: 19860331 Owner name: LIFT-TECH INTERNATIONAL, INC., 414 W. BROADWAY, MU Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DRESSER INDUSTRIES, INC. A CORP. OF DE.;REEL/FRAME:004539/0065 Effective date: 19860331 |
|
AS | Assignment |
Owner name: CHURCHILL CAPITAL PARTNERS Free format text: SECURITY INTEREST;ASSIGNOR:FIELDSTON ACQUISTION, INC. A CORPORATION OF DELAWARE;REEL/FRAME:005709/0162 Effective date: 19910408 |
|
AS | Assignment |
Owner name: NORWEST BANK MINNESOTA, NATIONAL ASSOCIATION, MINN Free format text: SECURITY INTEREST;ASSIGNOR:LIFT TECH INTERNATIONAL, INC.;REEL/FRAME:005717/0685 Effective date: 19910408 |
|
AS | Assignment |
Owner name: LIFT-TECH INTERNATIONAL, INC., MICHIGAN Free format text: NOTICE OF TERMINATION OF SECURITY AGREEMENT- INTELLECTUAL PROPERTY;ASSIGNOR:CHURCHILL CAPITAL PARTNERS;REEL/FRAME:008194/0108 Effective date: 19951101 Owner name: LIFT-TECH INTERNATIONAL, INC., MICHIGAN Free format text: PATENT RELEASE;ASSIGNOR:NORWEST BANK MINNESOTA, NATIONAL ASSOCIATION;REEL/FRAME:008194/0684 Effective date: 19961009 |