CA1165592A - Pinion gear - Google Patents
Pinion gearInfo
- Publication number
- CA1165592A CA1165592A CA000401595A CA401595A CA1165592A CA 1165592 A CA1165592 A CA 1165592A CA 000401595 A CA000401595 A CA 000401595A CA 401595 A CA401595 A CA 401595A CA 1165592 A CA1165592 A CA 1165592A
- Authority
- CA
- Canada
- Prior art keywords
- shank
- socket
- pinion gear
- jack
- handle
- 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
Links
Classifications
-
- 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
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
- B66F3/16—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated actuated through bevel-wheel gearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
- F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
- F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
- F16H1/14—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising conical gears only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Powder Metallurgy (AREA)
- Gears, Cams (AREA)
Abstract
Abstract:
A sintered powdered metal pinion gear is described for use in a screw jack or the like. It comprises a shank; a faced collar at one end of the shank; a plurality of side gear teeth on the collar face; a jack handle accommodating socket extending axially into the opposite end of the shank, said socket having a non-circular cross-section and a transverse hole extending through said shank perpendicular to the axis thereof and in communication with said jack handle-accommodating socket, said hole being adapted to engage and retain a lateral projection on the end of a jack handle when inserted into the socket.
A sintered powdered metal pinion gear is described for use in a screw jack or the like. It comprises a shank; a faced collar at one end of the shank; a plurality of side gear teeth on the collar face; a jack handle accommodating socket extending axially into the opposite end of the shank, said socket having a non-circular cross-section and a transverse hole extending through said shank perpendicular to the axis thereof and in communication with said jack handle-accommodating socket, said hole being adapted to engage and retain a lateral projection on the end of a jack handle when inserted into the socket.
Description
~55~
Back~round of the Invention This invention relates to vehicle jacks and the like, and more particularly to a pinion gear fvr ~se in a screw ~ack.
Jacks designed for use with trucks and similar vehicles must be efficient, safe and of low cost if they are to find aceeptance in the modern marketplace. One of the most effective jacks now available is a screw~type jack which includes a housing, and a screw member carried at least partially within the housing, arranged for upvard and down-ward motion. A pinion gear is journalled in the housing and rotation of this pinion gear turns ~a crown gear con-nected to the screw mem~er, causing the desired lifting motion.
Stringent operating characteristics are demanded of this pinion gear, while the gear production method is desirably of low cost. For many years, the stringent operating characteristics dictated that most commercially produced pinion gears for lifting jacks be produced by metal casting techni~ues. More recently, U.S. Patent 3!862,577 has described a pinion gear which is made by a cold forming technique. A popular modern material for making low cost metal components o~ this type is powdered metal and this material is, of course, used in a casting ~ethod. ~ccordingly, there has been a very considerable demand for an inexpensive casting technique using powdered -metal for the manufacture of a pinion gear for a jack.
The main problem in th~is respect~has been the socket in the pinion gear for receiving an operating crank or ~ : 7 : ~ : :
~ ~, ' .
-- 2 ~
handle for ~he jack. It is highly desirable that this socket include an enlarged inner portion adapted to receive and retain a lateral projection on the end of the crank handle. This projection serves to hold the handle within the socket such that the entire jack can be moved about by pulling or p~shing on the crank handle.
Such an enlarged inner portion of a socket is practic-ally an impossibility to make during a casting technique unless two parts are made and these are joined together.
Of course, the two part technique becomes too expensive and is not a practical solution. It was, therefore, the object of the present invention to provide a pinion gear which could be cast from powder metal in a single casting operation, while still including an enlarged inner portion in the socket to receive lateral projections on the end of the crank handle.
Summary of the Invention Thus, in accordance with one embodiment of the present invention there is provided a sintered powdered metal pinion gear for use in a screw jack or the like, comprisiny a shank, a faced collar at one end of the shank, a plur-ality of side gear~ teeth on the collar face, a jack handle-accommodating socket extending axially into the opposite end of the shank, said socket having a non-circular cross-section and a transverse hole extending through said shank perpendicular to the axis thereof and in communication with the jack handle-accommodating socket, this hole forming an enlargement within the socket to receive a lateral projec-tion on the end of a jack handle when inserted into the socket.
According to another embodiment of the invention, there is provided a process for producing a sintered powdered metal pinion gear for use in a screw jack or the like, which comprises compacting and sintering powdered metal in a mold to ~orm a pinion gear having a blank, a faced coll ar at one end of the shank, a plurality of side gear ~ ~t;;55'~
teeth on the face collar and a jack handle-accommodating socket of non-circular cross-section extending axially into the opposite end of the shank, removing the sintered gear from the mold and thereafter ~orming a hole trans-versely through the shank perpendicular to the axis thereof and in communication with the handle-accommodating socket.
This hole provides an inner enlargement to engage and retain a lateral projection on the end of the jack handle when inserted into the socket~
The forming of the hole through the shank after the pinion gear has been cast represents a very simple solution to the problem, but one which has proven to be highly effective.
Description of the Drawings Certain preferred embodiments of the present invention are illustrated by the attached drawings in which:
Figure 1 is an elevation view of a typical screw jack with a cutaway portion showing the location of the pinion gear of the invention;
Figure 2 is a side elevation in partial section of the completed pinion gear;
Figure 3 is a front elevation of the pinion gear; and Figure 4 is a rear elevation of the pinion gear.
As will be seen from Figure 1, the screw jack 10 includes a base 11 and a load engaging me~ber 12 mounted for movement upwardly or downwardly within a housing 13.
This housing 13 may be formed by stamping, dye casting pr any other convenient method. The upward or downward motion of the load member 12 is caused by a rotatable screw member 14 mounted within the housing 13. Rotation of the screw member 14 is caused by a gear drive train which includes a pinion gear 15 carried in an appropriate jack housing journal 16. This pinion gear 15 engages and turns a bottom crown gear 17 which is fixed to the screw member 14 for common bottom gear-screw member rotation.
The housing 13 and at least part of the bottom gear 17 ~ ~5~
are supported via a ball-type trust-bearing 28 on the base plate 11 which is adapted to rest on the ground or other support. The pinion gear is rotated by means of a jack handle 20, only the jack-engaging end of which is shown.
Looking at the pinion gear in greater detail, it will be seen that it includes a shank portion 21 with a faced collar 22 at one end of the shank. A plurality of side gear teeth 23 are formed on the collar face 24. In the opposite end of the shank is formed a jack handle-accommodating socket 25, this extending axially into the shank~ It will be seen that this socket has a generally rectangular cross-section and extends a substantial dis-tance into the shank. This socket may have a slight inward taper to facilitate removal of the formed pinion gear from the mold.
In order to manufacture the pinion gear, powdered metal is compacted into a mold and sintered, such as to form a pinion gear as shown in Figures 1-4 without the hole 26~ After the pinion gear has been formed in this manner, a transverse hole 26 is drilled through the shank and in communication with the socket 25o It will be seen that this hole 26 effectively provides a pair of interior enlargement in socket 25 for the lateral projection 27 on the end of the crank handle 20. Thus, the crank handle is inserted into the socket 25 with the lateral projection 27 in alignment with the long rectangular dimension of the socket. When the projection 27 has reached a location adjacent the holes 26, by rotating the handle, the projec tion comes into engagement with the edge of a hole whereby the pinion gear can be turned without the crank handle accidentally slipping out of the socket.
The final drilling step is a simple and inexpensive one to carry out, with the result that the pinion gear of this invention has combined the disparate requirements o~
being very inexpensive to produce while meeting the highest quality requirements in terms of accuracy, strength and operating characteristics.
Back~round of the Invention This invention relates to vehicle jacks and the like, and more particularly to a pinion gear fvr ~se in a screw ~ack.
Jacks designed for use with trucks and similar vehicles must be efficient, safe and of low cost if they are to find aceeptance in the modern marketplace. One of the most effective jacks now available is a screw~type jack which includes a housing, and a screw member carried at least partially within the housing, arranged for upvard and down-ward motion. A pinion gear is journalled in the housing and rotation of this pinion gear turns ~a crown gear con-nected to the screw mem~er, causing the desired lifting motion.
Stringent operating characteristics are demanded of this pinion gear, while the gear production method is desirably of low cost. For many years, the stringent operating characteristics dictated that most commercially produced pinion gears for lifting jacks be produced by metal casting techni~ues. More recently, U.S. Patent 3!862,577 has described a pinion gear which is made by a cold forming technique. A popular modern material for making low cost metal components o~ this type is powdered metal and this material is, of course, used in a casting ~ethod. ~ccordingly, there has been a very considerable demand for an inexpensive casting technique using powdered -metal for the manufacture of a pinion gear for a jack.
The main problem in th~is respect~has been the socket in the pinion gear for receiving an operating crank or ~ : 7 : ~ : :
~ ~, ' .
-- 2 ~
handle for ~he jack. It is highly desirable that this socket include an enlarged inner portion adapted to receive and retain a lateral projection on the end of the crank handle. This projection serves to hold the handle within the socket such that the entire jack can be moved about by pulling or p~shing on the crank handle.
Such an enlarged inner portion of a socket is practic-ally an impossibility to make during a casting technique unless two parts are made and these are joined together.
Of course, the two part technique becomes too expensive and is not a practical solution. It was, therefore, the object of the present invention to provide a pinion gear which could be cast from powder metal in a single casting operation, while still including an enlarged inner portion in the socket to receive lateral projections on the end of the crank handle.
Summary of the Invention Thus, in accordance with one embodiment of the present invention there is provided a sintered powdered metal pinion gear for use in a screw jack or the like, comprisiny a shank, a faced collar at one end of the shank, a plur-ality of side gear~ teeth on the collar face, a jack handle-accommodating socket extending axially into the opposite end of the shank, said socket having a non-circular cross-section and a transverse hole extending through said shank perpendicular to the axis thereof and in communication with the jack handle-accommodating socket, this hole forming an enlargement within the socket to receive a lateral projec-tion on the end of a jack handle when inserted into the socket.
According to another embodiment of the invention, there is provided a process for producing a sintered powdered metal pinion gear for use in a screw jack or the like, which comprises compacting and sintering powdered metal in a mold to ~orm a pinion gear having a blank, a faced coll ar at one end of the shank, a plurality of side gear ~ ~t;;55'~
teeth on the face collar and a jack handle-accommodating socket of non-circular cross-section extending axially into the opposite end of the shank, removing the sintered gear from the mold and thereafter ~orming a hole trans-versely through the shank perpendicular to the axis thereof and in communication with the handle-accommodating socket.
This hole provides an inner enlargement to engage and retain a lateral projection on the end of the jack handle when inserted into the socket~
The forming of the hole through the shank after the pinion gear has been cast represents a very simple solution to the problem, but one which has proven to be highly effective.
Description of the Drawings Certain preferred embodiments of the present invention are illustrated by the attached drawings in which:
Figure 1 is an elevation view of a typical screw jack with a cutaway portion showing the location of the pinion gear of the invention;
Figure 2 is a side elevation in partial section of the completed pinion gear;
Figure 3 is a front elevation of the pinion gear; and Figure 4 is a rear elevation of the pinion gear.
As will be seen from Figure 1, the screw jack 10 includes a base 11 and a load engaging me~ber 12 mounted for movement upwardly or downwardly within a housing 13.
This housing 13 may be formed by stamping, dye casting pr any other convenient method. The upward or downward motion of the load member 12 is caused by a rotatable screw member 14 mounted within the housing 13. Rotation of the screw member 14 is caused by a gear drive train which includes a pinion gear 15 carried in an appropriate jack housing journal 16. This pinion gear 15 engages and turns a bottom crown gear 17 which is fixed to the screw member 14 for common bottom gear-screw member rotation.
The housing 13 and at least part of the bottom gear 17 ~ ~5~
are supported via a ball-type trust-bearing 28 on the base plate 11 which is adapted to rest on the ground or other support. The pinion gear is rotated by means of a jack handle 20, only the jack-engaging end of which is shown.
Looking at the pinion gear in greater detail, it will be seen that it includes a shank portion 21 with a faced collar 22 at one end of the shank. A plurality of side gear teeth 23 are formed on the collar face 24. In the opposite end of the shank is formed a jack handle-accommodating socket 25, this extending axially into the shank~ It will be seen that this socket has a generally rectangular cross-section and extends a substantial dis-tance into the shank. This socket may have a slight inward taper to facilitate removal of the formed pinion gear from the mold.
In order to manufacture the pinion gear, powdered metal is compacted into a mold and sintered, such as to form a pinion gear as shown in Figures 1-4 without the hole 26~ After the pinion gear has been formed in this manner, a transverse hole 26 is drilled through the shank and in communication with the socket 25o It will be seen that this hole 26 effectively provides a pair of interior enlargement in socket 25 for the lateral projection 27 on the end of the crank handle 20. Thus, the crank handle is inserted into the socket 25 with the lateral projection 27 in alignment with the long rectangular dimension of the socket. When the projection 27 has reached a location adjacent the holes 26, by rotating the handle, the projec tion comes into engagement with the edge of a hole whereby the pinion gear can be turned without the crank handle accidentally slipping out of the socket.
The final drilling step is a simple and inexpensive one to carry out, with the result that the pinion gear of this invention has combined the disparate requirements o~
being very inexpensive to produce while meeting the highest quality requirements in terms of accuracy, strength and operating characteristics.
Claims (3)
1. A sintered powdered metal pinion gear for use in a screw jack or the like, comprising a shank; a faced collar at one end of the shank; a plurality of side gear teeth on the collar face; a jack handle accommodating socket extending axially into the opposite end of the shank, said socket having a non-circular cross-section and a transverse hole extending through said shank perpendicular to the axis thereof and in communication with said jack handle-accommodating socket, said hole being adapted to engage and retain a lateral projection on the end of a jack handle when inserted into the socket.
2. A pinion gear according to claim 1, wherein the handle-accommodating socket is of generally rectangular cross-section.
3. A process for producing a sintered powdered metal pinion gear for use in a screw jack or the like, which comprises compacting and sintering powdered metal in a mold to form a pinion gear having a shank, a faced collar at one end of the shank, a plurality of side gear teeth on the collar face, and a jack handle-accommodating socket of non-circular cross-section extending axially into the opposite end of the shank, removing the sintered gear from the mold and thereafter forming a hole transversely through said shank perpendicular to the axis thereof and in communication with said handle-accommodating socket, said hole being adopted to engage and retain a lateral projection on the end of a jack handle when inserted into the socket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000401595A CA1165592A (en) | 1982-04-23 | 1982-04-23 | Pinion gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000401595A CA1165592A (en) | 1982-04-23 | 1982-04-23 | Pinion gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1165592A true CA1165592A (en) | 1984-04-17 |
Family
ID=4122648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000401595A Expired CA1165592A (en) | 1982-04-23 | 1982-04-23 | Pinion gear |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1165592A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2613448A1 (en) * | 1987-04-02 | 1988-10-07 | Koito Mfg Co Ltd | MECHANISM WITH PERPENDICULAR AXIS GEARS |
-
1982
- 1982-04-23 CA CA000401595A patent/CA1165592A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2613448A1 (en) * | 1987-04-02 | 1988-10-07 | Koito Mfg Co Ltd | MECHANISM WITH PERPENDICULAR AXIS GEARS |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |