GB2248566A - Retracting power tool drive spindle - Google Patents
Retracting power tool drive spindle Download PDFInfo
- Publication number
- GB2248566A GB2248566A GB9120660A GB9120660A GB2248566A GB 2248566 A GB2248566 A GB 2248566A GB 9120660 A GB9120660 A GB 9120660A GB 9120660 A GB9120660 A GB 9120660A GB 2248566 A GB2248566 A GB 2248566A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spindle
- drive
- gear
- feed
- drive spindle
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/22—Feeding members carrying tools or work
- B23Q5/32—Feeding working-spindles
- B23Q5/326—Feeding working-spindles screw-operated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/22—Feeding members carrying tools or work
- B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
- B23Q5/38—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously
- B23Q5/40—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously by feed shaft, e.g. lead screw
- B23Q5/402—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously by feed shaft, e.g. lead screw in which screw or nut can both be driven
-
- 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
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/2018—Screw mechanisms with both screw and nut being driven, i.e. screw and nut are both rotating
-
- 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
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H2025/2062—Arrangements for driving the actuator
- F16H2025/2081—Parallel arrangement of drive motor to screw axis
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Automatic Tool Replacement In Machine Tools (AREA)
Abstract
A drive shaft 10 of the spindle has a spline portion 20 and a threaded portion 24. During normal operation, the drive spindle is rotated by interconnection of a drive gear 40 with the splined portion 20. When it is desired to retract the drive spindle, a drive spindle feed gear 30 is held stationary and the threaded engagement of the drive spindle feed gear 30 and the drive spindle causes the drive spindle to retract. Stopping movement of the feed gear 30 is by engagement of an idler gear 50 with a coned cap 80. During feed, the idler gear 30 could be engaged by a drive gear acting on the drive gear 40. <IMAGE>
Description
RETRACTION SYSTEM FOR A POWER TOOL DRIVE SPINDLE
The present invention pertains to power tools. More particularly, the present invention pertains to retraction systems for the drive spindles of power tools.
Power tools, particularly air or electrically driven power tools, include a drive spindle. The drive spindle normally operates at a high rpm and rotates a drill chuck or other device in order to perform work on a work piece. The performance of work on a work piece requires advancement of the drive spindle into the work piece. When the work has been accomplished, it is then necessary to retract the drive spindle from the work piece. The fabrication of a rapid, reliable retraction system to retract a drive spindle from a work piece has caused problems for power tool designers for many years. Some prior art systems employ a drive dog mechanism for retraction of the drive spindle from the work piece. Such drive dog systems have a tendency to jam when operated at high speeds.
There is, therefore, a need in the art to provide a rapid, reliable retraction system for drive spindles of power tools that can be operated at high speeds.
The drive spindle retraction system of the present invention provides a device and method for retraction of a power tool drive spindle at high speed.
A retraction system for the drive spindle of a power tool includes a drive spindle feed gear and a drive spindle drive gear.
The drive spindle feed gear is threadably interconnected with the drive spindle, and the drive spindle drive gear is connected to the drive spindle by splines. During the normal operation of the tool, the drive spindle drive gear causes rotation of the drive spindle by interconnection of the drive spindle drive gear with the splines formed on the drive spindle. During normal operation of the tool, the drive spindle drive gear and the drive spindle rotate together.
When the drive spindle is fully advanced into the work piece, and it is necessary to retract the drive spindle, the motion of the drive spindle feed gear is arrested. Because the drive spindle feed gear is threadably interconnected with the drive spindle, the continued rotation of the drive spindle by the drive spindle drive gear causes the drive spindle to back away from the work piece because of the interaction of the threads on the drive spindle with the threaded portion of the drive spindle feed gear.
A better understanding of the drive spindle retraction system of the present invention may be had with regard to the drawings wherein:
Figure 1 is a schematic illustrating the operation of the drive spindle retraction system of the present invention;
Figure 2 is a schematic of the preferred embodiment of the present invention; and
Figure 3 is an exploded view showing the lugged interconnection of two gears within the drive spindle retraction system of the present invention; and
Figure 4 is a cross sectional view of a power tool employing the drive spindle retraction system of the present invention.
A better understanding of the power tool drive spindle retraction system of the present invention 10 may be had by reference to Figure 1. Therein it may be seen that the drive spindle of a power tool 20 includes a splined portion 22 and a threaded portion 24. If the drive spindle advances by a clockwise or right-hand rotation, the threads 24 have a counterclockwise or left-hand orientation. Mounted on the drive spindle 20 is a spindle drive gear 40. The rotation of spindle drive gear 40 is imparted to drive spindle 20 by the splined interengagement 42 of the spindle drive gear 40 and drive spindle 20.
Mounted on the threaded portion of drive spindle 20 is spindle feed gear 30. Spindle. feed gear 30 is threadably engaged 32 with drive spindle 20. Enmeshing with spindle feed gear 30 is spindle feed idler gear 50. When drive spindle 20 advances to the full length of its travel, such as when spindle feed gear 30 contacts collar 60, spindle feed idler gear 50 is caused to stop rotating by engagement with cup 80. In the preferred embodiment, the engagement between spindle feed idler gear 50 and cup 80 is a tapered interfitment 86. As can be seen by reference to Figure 1, when the motion of spindle feed idler gear 50 is stopped, the motion of spindle feed gear 30 is similarly stopped.Because spindle drive gear 40 continues to drive spindle 20, the action of threads 24 on the threadable engagement 32 with drive spindle 20 will cause drive spindle 20 to move backward through spindle feed gear 30. Because of the splined interengagement 42 of spindle drive gear 40 with spindle 20, drive spindle 20 will also move through spindle drive gear 40. In one embodiment of the invention, drive spindle 20 is caused to engage actuator lever 72 which is connected to power flow switch or valve 70. Consequently, when drive spindle 20 hits lever 72, the flow of power to the power tool will be interrupted, and the tool will cease operation.
It will be understood by those of ordinary skill in the art that numerous methods of shutting off the power to the power tool may be used. Such methods can be based on the movement of the drive spindle 20 away from the work piece.
A preferred embodiment 110 of the drive spindle retraction system of the present invention is shown in Figure 2. Those parts having similar location, operation and functions bear the same numbers as in Figure 1; however, the numbers are preceded by the numeral 1 in the hundred's place. Therein, it may be seen that drive spindle 120 includes a splined portion 122 and a threaded portion 124. Mounted on drive spindle 120 is spindle drive gear 140 and spindle feed gear 130. Driving spindle drive gear 140 is spindle drive gear drive gear 190 and spindle feed idler gear 150.
Spindle drive gear drive gear 190 and spindle feed idler gear 150 are caused to rotate together by lug system 200 as shown in Figure 3. Therein it may be seen that lugs 201, 102 and 203 interact with spaces 204, 205 and 206.
Operation of the system shown in Figure 2 occurs when drive spindle 120 is driven by the engagement of drive spindle drive gear drive gear 190 with spindle drive gear 140 and the engagement of spindle feed idler gear 150 with spindle feed gear 130. Spindle drive gear drive gear 190 also drives spindle feed idler gear 150 through lug system 200.
Spindle feed gear 130 is threadably interconnected with the threaded portion 124 of drive spindle 120. Spindle drive gear 140 engages drive spindle 120 by the use of splines 122. When the drive spindle advances through collar 160 so that spindle feed gear 130 engages collar 160, forward advancement of drive spindle 120 is no longer possible and a barrier to further motion is established.
The weakest link in the system is between spindle feed idler gear 150 and spindle drive gear drive gear 190. Spindle feed idler gear 150 and spindle drive gear drive gear 190 disengage and lugs 201, 202 and 203 separate from spaces 204, 205 and 206 respectively.
Spindle feed idler gear 150 then moves towards cup 180. Cup 180 causes spindle feed idler gear 150 to stop rotational motion.
In the preferred embodiment of tapered interfitment 186 is used between cup 180 and gear 150; however, those of ordinary skill in the art will understand that numerous methods of arresting the motion of spindle feed idler gear 150 may be used without departing from the scope of the present invention.
Because drive spindle 120 is still caused to rotate by the continued motion of spindle drive gear drive gear 190 against the teeth of spindle drive gear 140 and the interaction of spindle drive gear 140 and splines 122, the interaction of the threads 124 with the threaded interconnection with spindle feed gear 130 causes drive shaft 120 to move back through spindle feed gear 130 and spindle drive gear 140. This movement of drive spindle 120 may be used to contact a device such as valve or switch 70. In Figure 2, it is shown that a lever 72 is contacted by drive spindle 120 which changes the condition of valve or switch 70.
The actual incorporation of the system of the present invention into a power tool 300 is shown in Figure 4. Therein, parts of similar functions, operations and positions as shown in
Figure 2 bear the same numbers, except that a "2" appears in the hundreds place.
There is thereby provided by the drive spindle retraction system of the present invention a method for rapidly and reliably retracting the drive spindle of a power tool.
Claims (10)
1. A retraction system for a power tool comprising:
a drive spindle, said drive spindle having:
a threaded portion;
a splined portion;
a spindle feed gear, said spindle feed gear threadably interconnected with said threaded portion of said drive spindle;
a spindle drive gear, said spindle drive gear slidably interconnected with said splined portion of said drive spindle;
means for arresting the rotational motion of said spindle feed gear;
whereby, when the rotational motion of said spindle feed gear is arrested, the continued rotation of said drive spindle caused by the engagement of the spindle drive gear with the splines of said drive spindle will cause axial movement of the drive spindle with respect to the spindle drive gear by the threaded engagement of the drive spindle with the spindle feed gear.
2. The retraction system as defined in Claim 1 further including a spindle feed idler gear, said spindle feed idler gear constructed and arranged to engage said spindle feed gear.
3. The retraction system as defined in Claim 2 wherein the means for arresting the rotational movement of said spindle feed gear is a cup which engages said spindle feed idler gear.
4. The retraction system as defined in Claim 3 wherein the orientation of the threads in said threaded portion of said drive spindle is directly counter to the advancing rotation of said drive spindle.
5. A retraction system for a power tool comprising:
a drive spindle, said drive spindle having:
a threaded portion;
a splined portion;
a spindle feed gear, said spindle feed gear threadably interconnected with said threaded portion or said drive spindle;
a spindle drive gear, said spindle drive gear slidably interconnected with said spline portion of said drive spindle;
a spindle feed idler gear, said spindle feed idler gear constructed and arranged to engage said spindle feed gear;
a spindle drive gear drive gear, said spindle drive gear drive gear constructed and arranged to engage said spindle drive gear;
a lug engagement system located on said spindle drive gear drive gear and said spindle feed idler gear, said lug engagement system constructed and arranged to cause said spindle drive gear drive gear and said spindle feed idler gear to rotate together;;
means for arresting the rotational motion of said spindle feed idler gear;
whereby when the rotational motion of said spindle feed idler gear is arrested, the continued rotation of said drive spindle caused by the engagement of the spindle drive gear with the splines on said drive spindle will cause axial movement of the drive spindle with respect to the spindle drive gear by the threaded engagement of the drive spindle with the spindle feed gear.
6. The retraction system as defined in Claim 5 wherein the means for arresting the rotational motion of said spindle feed idler gear is a cup member which frictionally engages said spindle feed idler gear.
7. The retraction system as defined in Claim 6 wherein said frictional engagement between said cup and said spindle feed idler gear is a tapered interfitment.
8. The retraction system as defined in Claim 7 further including a collar which surrounds said drive spindle; and
means for disengaging said spindle feed idler gear from said spindle drive gear drive gear, said means for disengaging being activated when said spindle feed gear contacts said collar.
9. The retraction system as defined in Claim 8 further including means for stopping the flow of power to the power tool, said means for stopping the flow of power to the power tool being engaged upon full retraction of said drive spindle.
10. A method for retracting a drive spindle on a power tool, said method comprising the steps of:
rotating the drive spindle with a spindle drive gear having a splined engagement with the drive spindle;
threadably engaging a spindle feed gear with the drive spindle;
arresting the motion of said spindle feed gear;
whereby the continued rotation of said drive spindle caused by said spindle drive gear will cause said drive spindle to retract by the threadable engagement of said spindle feed gear with the drive spindle.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US59099390A | 1990-10-01 | 1990-10-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9120660D0 GB9120660D0 (en) | 1991-11-06 |
| GB2248566A true GB2248566A (en) | 1992-04-15 |
Family
ID=24364587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9120660A Withdrawn GB2248566A (en) | 1990-10-01 | 1991-09-27 | Retracting power tool drive spindle |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2248566A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2108478A1 (en) | 2008-04-11 | 2009-10-14 | The Boeing Company | Method and apparatus for a spindle with servo feed control |
| US20090311059A1 (en) * | 2005-09-14 | 2009-12-17 | Airbus France | Boring device |
| US8418574B2 (en) | 2007-02-14 | 2013-04-16 | Rolls-Royce Plc | Linear actuator |
| CN104589128A (en) * | 2015-01-09 | 2015-05-06 | 安徽晟泰精工科技有限公司 | Shaft transmission structure of numerical control machine tool |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1283730A (en) * | 1968-10-31 | 1972-08-02 | Rockwell Mfg Co | Portable power tool |
| EP0143158A1 (en) * | 1983-10-31 | 1985-06-05 | Dresser Industries, Inc. | Improved retraction apparatus for automatic feed drills or the like |
| GB2171938A (en) * | 1985-03-04 | 1986-09-10 | Dresser Ind | Drill with controlled feed and retraction |
| GB2185427A (en) * | 1986-01-15 | 1987-07-22 | Westinghouse Electric Corp | Tube plug removal machine |
| GB2195164A (en) * | 1986-08-27 | 1988-03-30 | Desoutter Ltd | Positive feed device for a power tool such as a drill |
-
1991
- 1991-09-27 GB GB9120660A patent/GB2248566A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1283730A (en) * | 1968-10-31 | 1972-08-02 | Rockwell Mfg Co | Portable power tool |
| EP0143158A1 (en) * | 1983-10-31 | 1985-06-05 | Dresser Industries, Inc. | Improved retraction apparatus for automatic feed drills or the like |
| GB2171938A (en) * | 1985-03-04 | 1986-09-10 | Dresser Ind | Drill with controlled feed and retraction |
| GB2185427A (en) * | 1986-01-15 | 1987-07-22 | Westinghouse Electric Corp | Tube plug removal machine |
| GB2195164A (en) * | 1986-08-27 | 1988-03-30 | Desoutter Ltd | Positive feed device for a power tool such as a drill |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090311059A1 (en) * | 2005-09-14 | 2009-12-17 | Airbus France | Boring device |
| US8292550B2 (en) * | 2005-09-14 | 2012-10-23 | Airbus Operations Sas | Boring device |
| US8418574B2 (en) | 2007-02-14 | 2013-04-16 | Rolls-Royce Plc | Linear actuator |
| EP2108478A1 (en) | 2008-04-11 | 2009-10-14 | The Boeing Company | Method and apparatus for a spindle with servo feed control |
| CN104589128A (en) * | 2015-01-09 | 2015-05-06 | 安徽晟泰精工科技有限公司 | Shaft transmission structure of numerical control machine tool |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9120660D0 (en) | 1991-11-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |