CA2140086C - Hand operated hoist - Google Patents
Hand operated hoist Download PDFInfo
- Publication number
- CA2140086C CA2140086C CA002140086A CA2140086A CA2140086C CA 2140086 C CA2140086 C CA 2140086C CA 002140086 A CA002140086 A CA 002140086A CA 2140086 A CA2140086 A CA 2140086A CA 2140086 C CA2140086 C CA 2140086C
- Authority
- CA
- Canada
- Prior art keywords
- wheel
- driven
- pinions
- drive
- pinion
- 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 - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/02—Driving gear
-
- 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
- B66D3/16—Chain or like hand-operated tackles with or without power transmission gearing between operating member and lifting rope, chain or cable operated by an endless chain passing over a pulley or a sprocket
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gears, Cams (AREA)
- Gear Transmission (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Retarders (AREA)
- Handcart (AREA)
- Transmission Devices (AREA)
Abstract
A compact, light duty hand operated hoist having a drive train containing successive groupings of engaged pinions and wheels is characterized in that the pinions have less than five gear teeth, that such gear teeth and the gear teeth of the wheels with which they engage are helical and lengths of the gear teeth of the pinions are sufficient to provide a contact ratio of one or more.
Description
2140~8~
HAND OPERATED HOI~T
BACKGROUND OF THE INVENTION
In compact, light duty, hand operated chain hoists it is known to provide a hand operated drive wheel and a load lift wheel interconnected by a drive train including a drive pinion coupled to the drive wheel, a pair of first driven wheels arranged to mesh with the drive pinion, a pair of driven pinions rotatable with the first driven wheels, and a second driven wheel coupled to the lift wheel and arranged to mesh with the driven pinions.
In all known hand hoists of the type described, the pinions and the driven wheels are spur gears with each of the pinions typically having four teeth in order to provide a mechanical advantage within the range required for this type of hoist. These prior hoists have contact ratios of less than one, which means that the pinions are not disposed in continuous drive engagement or connection with their associated driven wheels. When a disengagement or uncoupling of the pinions and driven wheels occurs, a hoist supported load is permitted to momentarily accelerate with the result that a hoist operator observes an abrupt change in hand chain pull loading.
Hoists of the type described generally have load ratings of up to ten tons. Hand operated chain hoists having larger load ratings typically employ different types of drive trains developed for heavy duty opera-tion, such as that afforded by planetary gearing, whose use does not produce abrupt changes in hand chain pull loadings.
It is theoretically possible to achieve a contact ratio of one for constructions employing pinions formed with five teeth. Further, hoists employing pinions formed with more than five teeth may of course be constructed to provide contact ratios greater than one.
However, this leads to the need to provide pinions and 2140~86 -driven wheels of greater diameter, determined by the requirement that a certain tooth size be maintained to accommodate tooth loading conditions, and results in an unacceptable increase in the overall size and weight of the hoist.
Accordingly, with a view towards minimizing overall size and weight of light duty hoists of the type described, manufacturers of such hoists have for at least ten years offered hoists having the undesirable feature of exposing an operator to abrupt changes in hand chain pull loads.
SUMMARY OF THE INVENTION
The present invention relates to an improvement in compact, light duty hand operated chain hoists, which avoids the problem of abrupt changes in hand chain pull loadings without resort to the use of pinion gears having more than four teeth.
In accordance with a preferred form of the present invention, a compact, light duty hand operated chain hoist of the type having a drive train including a drive pinion coupled to a chain operated drive wheel, a pair of first driven wheels arranged to mesh with the drive pinion, a pair of driven pinions rotatable with the first driven wheels, and a second driven wheel arranged to mesh with the driven pinions and to be coupled to a load lift wheel, is modified to provide the pinions and the driven wheels with helical teeth, wherein the helical teeth of the pinions are from one through four in number and the teeth have axial lengths sufficient to ensure creation of a contact ratio of at least one.
BRIEF DESCRIPTION OF THE DRAWINGS
The nature and mode of operation of the present invention will now be more fully described in the following detailed description taken with the accompanying drawings wherein:
214~086 Fig. 1 is a perspective view of a compact hand operated hoist incorporating the present invention;
Fig. 2 is a sectional view taken generally along the line 2-2 in Fig. l;
Fig. 3 is a sectional view taken generally along the line 3-3 in Fig. 2; and Fig. 4 is a sectional view taken generally along the line 4-4 in Fig. 2.
DETAILED DESCRIPTION
A compact, light duty, hand operated chain hoist incorporating the present invention is generally desig-nated as 10 in Fig. 1. Hoist 10 is conventional from the standpoint that it includes a casing 12, which is adapted for suspension from a suitable support, not shown, by a hook 14, and serves in turn to support a drive wheel 16, a load lift wheel 18, and a drive train shown in part in Figs. 2-4 and generally designated as 20. Typically, rotation is imparted to drive wheel 16 by a manually operable link chain and lift wheel is coupled to a suitable load via a link chain, neither link chain being shown.
Drive train 20 typically includes a drive shaft 22, which is coupled to drive wheel 16 via a clutch, not shown, and is supported to extend transversely within casing 12 for rotation about an axis 22a disposed concentrically inwardly of lift wheel 18; a drive pinion 24 carried by and keyed for rotation with drive shaft 22; a pair of stub shafts 26 and 28 which are supported by bearings for rotation about a pair of axes 26a and 28a disposed parallel to drive shaft axis 22a and which carry a pair of first driven wheels 26b and 28b each arranged to mesh with drive pinion 24, respectively.
Stub shafts 26 and 28 also include driven pinions 26c and 28c, respectively, which are each arranged to mesh with a second driven wheel 30 fixedly coupled to lift wheel 18 by a tubular shaft 32 concentrically and slidably mounted about drive shaft 22. Pinions 24, 26c, 2140~86 and 28c and driven wheels 26b, 28b, and 30 are mounted within casing 12 in a manner which prevents relative movement therebetween in an axial direction.
In accordance with the present invention, pinions 24, 26c, and 28c and driven wheels 26b, 28b and 30 are provided with helical gear teeth 34. In a preferred form of the invention, drive pinion 24 has four gear teeth 34, a normal diametral pitch of ten teeth-per-inch, a pressure angle of 14.5 degrees, and a right-hand helix angle of 15 degrees; first driven wheels 26b and 28b each have sixteen gear teeth 34, a normal diametral pitch of ten teeth-per-inch, a pressure angle of 14.5 degrees, and a left-hand helix angle of 15 degrees;
driven pinions 26c and 28c each have four gear teeth 34, a normal diametral pitch of ten teeth-per-inch, a pressure angle of 14.5 degrees, and a left-hand helix angle of 15 degrees; and second driven wheel 30 has sixteen teeth, a normal diametral pitch of ten teeth-per-inch, a pressure angle of 14.5 degrees, and a right-hand helix angle of 15 degrees.
In order to avoid the problem of abrupt change in hand chain pull loading encountered in prior art light duty hoists, gear teeth 34 are of sufficient length in the axial direction (face width) to provide a total contact ratio of approximately one or more for both the input mesh between drive pinion 24 and first driven wheels 26b and 28b, and the output mesh between driven pinions 26c and 28c and second driven wheel 30. Where a face width of 3/8" is provided for the input mesh of the preferred gear train described above, gear analysis indicates that a total contact ratio of 1.16 is achieved. Where a face width of 1-1/8" is provided for the output mesh of the preferred gear train, a total contact ratio of 1.78 is achieved.
As may be appreciated from the above description, the gear train of the preferred embodiment provides a hoist which is of acceptable overall size and weight, yet which also provides the necessary mechanical advan-21 41~08~
tage without undesirable abrupt changes in hand chain pull loading.
While the preferred embodiment described above employs pinions 24, 26c, and 28c each having four gear teeth 34, S it is contemplated to provide fewer than four gear teeth on each pinion while maintaining a total contact ratio of approximately one or more for the input and output meshes. Also, use of a single first driven wheel and single driven pinion is considered to be within the scope of the present invention, as defined by the claims below.
HAND OPERATED HOI~T
BACKGROUND OF THE INVENTION
In compact, light duty, hand operated chain hoists it is known to provide a hand operated drive wheel and a load lift wheel interconnected by a drive train including a drive pinion coupled to the drive wheel, a pair of first driven wheels arranged to mesh with the drive pinion, a pair of driven pinions rotatable with the first driven wheels, and a second driven wheel coupled to the lift wheel and arranged to mesh with the driven pinions.
In all known hand hoists of the type described, the pinions and the driven wheels are spur gears with each of the pinions typically having four teeth in order to provide a mechanical advantage within the range required for this type of hoist. These prior hoists have contact ratios of less than one, which means that the pinions are not disposed in continuous drive engagement or connection with their associated driven wheels. When a disengagement or uncoupling of the pinions and driven wheels occurs, a hoist supported load is permitted to momentarily accelerate with the result that a hoist operator observes an abrupt change in hand chain pull loading.
Hoists of the type described generally have load ratings of up to ten tons. Hand operated chain hoists having larger load ratings typically employ different types of drive trains developed for heavy duty opera-tion, such as that afforded by planetary gearing, whose use does not produce abrupt changes in hand chain pull loadings.
It is theoretically possible to achieve a contact ratio of one for constructions employing pinions formed with five teeth. Further, hoists employing pinions formed with more than five teeth may of course be constructed to provide contact ratios greater than one.
However, this leads to the need to provide pinions and 2140~86 -driven wheels of greater diameter, determined by the requirement that a certain tooth size be maintained to accommodate tooth loading conditions, and results in an unacceptable increase in the overall size and weight of the hoist.
Accordingly, with a view towards minimizing overall size and weight of light duty hoists of the type described, manufacturers of such hoists have for at least ten years offered hoists having the undesirable feature of exposing an operator to abrupt changes in hand chain pull loads.
SUMMARY OF THE INVENTION
The present invention relates to an improvement in compact, light duty hand operated chain hoists, which avoids the problem of abrupt changes in hand chain pull loadings without resort to the use of pinion gears having more than four teeth.
In accordance with a preferred form of the present invention, a compact, light duty hand operated chain hoist of the type having a drive train including a drive pinion coupled to a chain operated drive wheel, a pair of first driven wheels arranged to mesh with the drive pinion, a pair of driven pinions rotatable with the first driven wheels, and a second driven wheel arranged to mesh with the driven pinions and to be coupled to a load lift wheel, is modified to provide the pinions and the driven wheels with helical teeth, wherein the helical teeth of the pinions are from one through four in number and the teeth have axial lengths sufficient to ensure creation of a contact ratio of at least one.
BRIEF DESCRIPTION OF THE DRAWINGS
The nature and mode of operation of the present invention will now be more fully described in the following detailed description taken with the accompanying drawings wherein:
214~086 Fig. 1 is a perspective view of a compact hand operated hoist incorporating the present invention;
Fig. 2 is a sectional view taken generally along the line 2-2 in Fig. l;
Fig. 3 is a sectional view taken generally along the line 3-3 in Fig. 2; and Fig. 4 is a sectional view taken generally along the line 4-4 in Fig. 2.
DETAILED DESCRIPTION
A compact, light duty, hand operated chain hoist incorporating the present invention is generally desig-nated as 10 in Fig. 1. Hoist 10 is conventional from the standpoint that it includes a casing 12, which is adapted for suspension from a suitable support, not shown, by a hook 14, and serves in turn to support a drive wheel 16, a load lift wheel 18, and a drive train shown in part in Figs. 2-4 and generally designated as 20. Typically, rotation is imparted to drive wheel 16 by a manually operable link chain and lift wheel is coupled to a suitable load via a link chain, neither link chain being shown.
Drive train 20 typically includes a drive shaft 22, which is coupled to drive wheel 16 via a clutch, not shown, and is supported to extend transversely within casing 12 for rotation about an axis 22a disposed concentrically inwardly of lift wheel 18; a drive pinion 24 carried by and keyed for rotation with drive shaft 22; a pair of stub shafts 26 and 28 which are supported by bearings for rotation about a pair of axes 26a and 28a disposed parallel to drive shaft axis 22a and which carry a pair of first driven wheels 26b and 28b each arranged to mesh with drive pinion 24, respectively.
Stub shafts 26 and 28 also include driven pinions 26c and 28c, respectively, which are each arranged to mesh with a second driven wheel 30 fixedly coupled to lift wheel 18 by a tubular shaft 32 concentrically and slidably mounted about drive shaft 22. Pinions 24, 26c, 2140~86 and 28c and driven wheels 26b, 28b, and 30 are mounted within casing 12 in a manner which prevents relative movement therebetween in an axial direction.
In accordance with the present invention, pinions 24, 26c, and 28c and driven wheels 26b, 28b and 30 are provided with helical gear teeth 34. In a preferred form of the invention, drive pinion 24 has four gear teeth 34, a normal diametral pitch of ten teeth-per-inch, a pressure angle of 14.5 degrees, and a right-hand helix angle of 15 degrees; first driven wheels 26b and 28b each have sixteen gear teeth 34, a normal diametral pitch of ten teeth-per-inch, a pressure angle of 14.5 degrees, and a left-hand helix angle of 15 degrees;
driven pinions 26c and 28c each have four gear teeth 34, a normal diametral pitch of ten teeth-per-inch, a pressure angle of 14.5 degrees, and a left-hand helix angle of 15 degrees; and second driven wheel 30 has sixteen teeth, a normal diametral pitch of ten teeth-per-inch, a pressure angle of 14.5 degrees, and a right-hand helix angle of 15 degrees.
In order to avoid the problem of abrupt change in hand chain pull loading encountered in prior art light duty hoists, gear teeth 34 are of sufficient length in the axial direction (face width) to provide a total contact ratio of approximately one or more for both the input mesh between drive pinion 24 and first driven wheels 26b and 28b, and the output mesh between driven pinions 26c and 28c and second driven wheel 30. Where a face width of 3/8" is provided for the input mesh of the preferred gear train described above, gear analysis indicates that a total contact ratio of 1.16 is achieved. Where a face width of 1-1/8" is provided for the output mesh of the preferred gear train, a total contact ratio of 1.78 is achieved.
As may be appreciated from the above description, the gear train of the preferred embodiment provides a hoist which is of acceptable overall size and weight, yet which also provides the necessary mechanical advan-21 41~08~
tage without undesirable abrupt changes in hand chain pull loading.
While the preferred embodiment described above employs pinions 24, 26c, and 28c each having four gear teeth 34, S it is contemplated to provide fewer than four gear teeth on each pinion while maintaining a total contact ratio of approximately one or more for the input and output meshes. Also, use of a single first driven wheel and single driven pinion is considered to be within the scope of the present invention, as defined by the claims below.
Claims (6)
1. A compact hand operated hoist comprising in combination:
a hand chain operated drive wheel;
a load lift wheel;
a drive train connecting said drive wheel to said lift wheel including a drive pinion, coupled to said drive wheel, a first driven wheel arranged to mesh with said drive pinion, a driven pinion rotatable with said first driven wheel and a second driven wheel arranged to mesh with the said driven pinion and coupled to said lift wheel, said pinions each having between one and four teeth, said pinions and driven wheels have helical gear teeth and being fixed against movement axially of one another and said gear teeth having lengths, as measured along their axes of rotation, sufficient to provide a contact ratio of substantially one or more; and a casing for supporting said drive wheel, said lift wheel and said drive train.
a hand chain operated drive wheel;
a load lift wheel;
a drive train connecting said drive wheel to said lift wheel including a drive pinion, coupled to said drive wheel, a first driven wheel arranged to mesh with said drive pinion, a driven pinion rotatable with said first driven wheel and a second driven wheel arranged to mesh with the said driven pinion and coupled to said lift wheel, said pinions each having between one and four teeth, said pinions and driven wheels have helical gear teeth and being fixed against movement axially of one another and said gear teeth having lengths, as measured along their axes of rotation, sufficient to provide a contact ratio of substantially one or more; and a casing for supporting said drive wheel, said lift wheel and said drive train.
2. A compact hand operated hoist according to claim 1, wherein said drive pinion meshes with a pair of first driven wheels and a pair of said driven pinions are rotatable with said pair of first driven wheels and each of said pair of driven pinions meshes with said second driven wheel.
3. A compact hand operated hoist according to claim 2, wherein said pinions each have four teeth.
4. A compact hand operated hoist comprising in combination:
a hand chain operated drive wheel;
a load lift wheel;
a drive train for connecting said drive wheel to said lift wheel, wherein said drive train includes a drive pinion carried by a shaft supported for rotation about an axis and coupled to said drive wheel, a pair of stub shafts supported for rotation about a pair of axes disposed parallel to said axis, each of said stub shafts having a first driven wheel arranged to mesh with said drive pinion and an axially aligned driven pinion, and a second driven wheel carried by a tubular shaft disposed concentrically of said shaft and coupled to said lift wheel, said driven pinion of each of said stub shafts meshing with said second driven wheel, said pinions each having fewer than five teeth, said pinions and said driven wheels having helical gear teeth, said pinions and driven wheels being fixed against movement axially of one another, and said gear teeth of said pinions have lengths, as measured lengthwise of said axis and said axes, sufficient to provide a contact ratio of about one or more; and a casing for supporting said drive wheel, said lift wheel and said drive train.
a hand chain operated drive wheel;
a load lift wheel;
a drive train for connecting said drive wheel to said lift wheel, wherein said drive train includes a drive pinion carried by a shaft supported for rotation about an axis and coupled to said drive wheel, a pair of stub shafts supported for rotation about a pair of axes disposed parallel to said axis, each of said stub shafts having a first driven wheel arranged to mesh with said drive pinion and an axially aligned driven pinion, and a second driven wheel carried by a tubular shaft disposed concentrically of said shaft and coupled to said lift wheel, said driven pinion of each of said stub shafts meshing with said second driven wheel, said pinions each having fewer than five teeth, said pinions and said driven wheels having helical gear teeth, said pinions and driven wheels being fixed against movement axially of one another, and said gear teeth of said pinions have lengths, as measured lengthwise of said axis and said axes, sufficient to provide a contact ratio of about one or more; and a casing for supporting said drive wheel, said lift wheel and said drive train.
5. A compact hand operated hoist according to claim 4, wherein said gear teeth of said drive pinion and said second driven wheel curve in a first direction, and said gear teeth of said first driven wheels and said driven pinions curve in a second direction opposite to said first direction.
6. A compact hand operated hoist according to claim 5, wherein said pinions each have four gear teeth.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US33054794A | 1994-10-28 | 1994-10-28 | |
| US08/330,547 | 1994-10-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2140086A1 CA2140086A1 (en) | 1996-04-29 |
| CA2140086C true CA2140086C (en) | 2000-09-05 |
Family
ID=23290242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002140086A Expired - Fee Related CA2140086C (en) | 1994-10-28 | 1995-01-12 | Hand operated hoist |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2627146B2 (en) |
| KR (1) | KR0153102B1 (en) |
| CA (1) | CA2140086C (en) |
| DE (1) | DE19502233C2 (en) |
| TW (1) | TW331326U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105129655A (en) * | 2015-09-01 | 2015-12-09 | 浙江冠林机械有限公司 | Novel lever hoist |
| US10549964B2 (en) | 2018-05-18 | 2020-02-04 | Columbus Mckinnon Corporation | Manual hoist with automatic speed change device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1949920A (en) * | 1931-03-26 | 1934-03-06 | Riley Engineering & Supply Co | Hoist |
-
1995
- 1995-01-12 CA CA002140086A patent/CA2140086C/en not_active Expired - Fee Related
- 1995-01-19 TW TW085216286U patent/TW331326U/en unknown
- 1995-01-25 DE DE19502233A patent/DE19502233C2/en not_active Expired - Fee Related
- 1995-03-06 KR KR1019950004469A patent/KR0153102B1/en not_active IP Right Cessation
- 1995-06-26 JP JP7182183A patent/JP2627146B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR960013975A (en) | 1996-05-22 |
| KR0153102B1 (en) | 1999-02-18 |
| JP2627146B2 (en) | 1997-07-02 |
| TW331326U (en) | 1998-05-01 |
| CA2140086A1 (en) | 1996-04-29 |
| DE19502233A1 (en) | 1996-05-02 |
| JPH08119586A (en) | 1996-05-14 |
| DE19502233C2 (en) | 2001-02-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20130114 |