CA1138687A - Elevator for drill press table - Google Patents
Elevator for drill press tableInfo
- Publication number
- CA1138687A CA1138687A CA000356461A CA356461A CA1138687A CA 1138687 A CA1138687 A CA 1138687A CA 000356461 A CA000356461 A CA 000356461A CA 356461 A CA356461 A CA 356461A CA 1138687 A CA1138687 A CA 1138687A
- Authority
- CA
- Canada
- Prior art keywords
- chain
- sprocket wheel
- column
- sprocket
- movement
- 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
- 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
-
- 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
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/25—Movable or adjustable work or tool supports
- B23Q1/44—Movable or adjustable work or tool supports using particular mechanisms
- B23Q1/48—Movable or adjustable work or tool supports using particular mechanisms with sliding pairs and rotating pairs
- B23Q1/4828—Movable or adjustable work or tool supports using particular mechanisms with sliding pairs and rotating pairs a single rotating pair followed parallelly by a single sliding pair
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
- Machine Tool Units (AREA)
Abstract
ELEVATOR FOR DRILL PRESS TABLE
ABSTRACT OF THE INVENTION
An elevator for a drill press table comprises a sprocket chain suspended at the top of the drill press column to extend verti-cally downwardly along the column, and a companion sprocket wheel mounted on the drill press table for rotation about a substan-tially horizontal axis. A friction brake mechanism restrains angular movement of the sprocket wheel and holds the table in the vertical position thereby determined. A crank directly connected to the sprocket wheel rotates the sprocket wheel up or down the chain correspondingly to position the drill press table. In the preferred arrangement, a ratchet mechanism allows the crank to override the brake in the up direction of the sprocket. Rapid and reliable adjustment of table height is achieved.
ABSTRACT OF THE INVENTION
An elevator for a drill press table comprises a sprocket chain suspended at the top of the drill press column to extend verti-cally downwardly along the column, and a companion sprocket wheel mounted on the drill press table for rotation about a substan-tially horizontal axis. A friction brake mechanism restrains angular movement of the sprocket wheel and holds the table in the vertical position thereby determined. A crank directly connected to the sprocket wheel rotates the sprocket wheel up or down the chain correspondingly to position the drill press table. In the preferred arrangement, a ratchet mechanism allows the crank to override the brake in the up direction of the sprocket. Rapid and reliable adjustment of table height is achieved.
Description
1.3Y687
2 ¦ TECH IC~L FIELD OF INVENTION
31 This invention relates to machine tools, and particularly, to a 41 mechanism for elevating and lowering a drill press table.
? BACKGROUND ART
9 Drill presses ordinarily utilize a simple split collar and draw bolt mechanism for clamping the work table to the drill press 11 column. Adjustment of work table height is crude and tedious.
12 Refined mechanisms for achieving adjustment have been suggested.
13 U.S.A. patent to Tautz, No. ?,122,966, typi~ies the present 14 state of that art. Tautz discloses a gear mechanism including a gear ra~k supported at the side of the drill press column. A
16 worm/ a worm wheel and pinion are all supported heneath the work 17 table in a bearing block cast integrally with the work table.
l8 The worm and worm wheel arrangement prevents gravity from driving l9 the gear mechanism in reverse whereby the table maintains its adjusted position even if the column clamp is open. The gear 21 mechanism is a bit complex and, consequently, expensive.
23 One difficulty with a mechanism of the type shown in the Tautz 24 patent is that the lifting and lowering of the table is necessar-26 ily slow due to the inherent high gear ratio between the worm and worm wheel. A practical problem is that light weight drill 27 presses simply cannot be inexpensively priced if provided with 29 a table elevating mechanism of the type suggested by Tautz. No practical way has heretofore existed for adding a table elevator to a drill press, whether of the heavy duty or light weight . 3l class.
1~ 113B6~37 1 ¦ OBJ~CTI~ES
31 This invention relates to machine tools, and particularly, to a 41 mechanism for elevating and lowering a drill press table.
? BACKGROUND ART
9 Drill presses ordinarily utilize a simple split collar and draw bolt mechanism for clamping the work table to the drill press 11 column. Adjustment of work table height is crude and tedious.
12 Refined mechanisms for achieving adjustment have been suggested.
13 U.S.A. patent to Tautz, No. ?,122,966, typi~ies the present 14 state of that art. Tautz discloses a gear mechanism including a gear ra~k supported at the side of the drill press column. A
16 worm/ a worm wheel and pinion are all supported heneath the work 17 table in a bearing block cast integrally with the work table.
l8 The worm and worm wheel arrangement prevents gravity from driving l9 the gear mechanism in reverse whereby the table maintains its adjusted position even if the column clamp is open. The gear 21 mechanism is a bit complex and, consequently, expensive.
23 One difficulty with a mechanism of the type shown in the Tautz 24 patent is that the lifting and lowering of the table is necessar-26 ily slow due to the inherent high gear ratio between the worm and worm wheel. A practical problem is that light weight drill 27 presses simply cannot be inexpensively priced if provided with 29 a table elevating mechanism of the type suggested by Tautz. No practical way has heretofore existed for adding a table elevator to a drill press, whether of the heavy duty or light weight . 3l class.
1~ 113B6~37 1 ¦ OBJ~CTI~ES
3 I The primary objective of the present invention is to provide a 41 simple mechanism for elevating a drill press table free of the 51 foregoing disadvantages. More particularly, an object of the 61 present invention is to provide an inexpensive mechanism that 7 allows rapid and definitive adjustment of the table height.
8 Another object of the present invention is to provide a mecXanism 9 so simple that it may be attached to an existing drill press without any modification of the drill press table or any of its 16 I ~ he arts.
o~
` ` 1~31~6~37 2 ¦ SUMMARY OF THE INVENTION
3 ¦ In order to achieve the foregoing objectives, I provide a 41 sprocket chain suspended at its top by a simple circular track and roller arrangement. To the table collar or to another part 6 of the table, I clamp a reversible crank mechanism that includes 7 a horizontal crank shaft mounting a crank arm and a sprocket 8 wheel held in engagement with the sprocket chain. The crank arm 9 is frictionally restrained against rotation. Movement of the crank arm directly drives the sprocket, thereby causing the 11 sprocket rapidly to move upwardly or downwardly along the chain, 12 correspondingly to elevate or lower the table. In a preferred 13 embodiment, a one way drive or ratchet mechanism is interposed 14 between the crank arm and the friction brake so that the friction of the brake need not be overcome when the table is elevated, 16 but only when the table is lowered. When the table is elevated, 17 a pawl overrides the ratchet which serves as a backstop. The 18 friction brake is at all times operative to prevent runaway 19 movement.
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` 113E~6~37 i ~RIEF DESCRIPTION OF T~E DRAWINGS
2 , . 3 A detailed descript on of *he inventio~ will be made with re-
8 Another object of the present invention is to provide a mecXanism 9 so simple that it may be attached to an existing drill press without any modification of the drill press table or any of its 16 I ~ he arts.
o~
` ` 1~31~6~37 2 ¦ SUMMARY OF THE INVENTION
3 ¦ In order to achieve the foregoing objectives, I provide a 41 sprocket chain suspended at its top by a simple circular track and roller arrangement. To the table collar or to another part 6 of the table, I clamp a reversible crank mechanism that includes 7 a horizontal crank shaft mounting a crank arm and a sprocket 8 wheel held in engagement with the sprocket chain. The crank arm 9 is frictionally restrained against rotation. Movement of the crank arm directly drives the sprocket, thereby causing the 11 sprocket rapidly to move upwardly or downwardly along the chain, 12 correspondingly to elevate or lower the table. In a preferred 13 embodiment, a one way drive or ratchet mechanism is interposed 14 between the crank arm and the friction brake so that the friction of the brake need not be overcome when the table is elevated, 16 but only when the table is lowered. When the table is elevated, 17 a pawl overrides the ratchet which serves as a backstop. The 18 friction brake is at all times operative to prevent runaway 19 movement.
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` 113E~6~37 i ~RIEF DESCRIPTION OF T~E DRAWINGS
2 , . 3 A detailed descript on of *he inventio~ will be made with re-
4 ference to the accompanying drawings wherein like numerals desig-. .
nate corresponding parts in the several figures. These drawings 6 are to scale. .
8 FIGURE 1 is a pictorial-view of a drill press to which is.
9 attached an elevator mechanism incorporating the pxesent--inven-10 tion.
11 .' ' , , , 12 FIG. 2 is an enlarged horizontal sectional view through the drill 13 press and attachment, showing the crank mechanism, the view being 14 taken along a plane corresponding to line 2-2 of FIG. 1.
16 FIG. 3 is a segmen~ed vertical sectional view taken along the 17 offset plane corresponding to line 3-3 of FIG. 2.
19 FIG. 4 is an elevational view, partly in section, showing the chain and sprocket structure and taken along the plane indicated .
21 ~y line 4-4 of FIG. 3.
24 FIG. 5 is a horizontal sectional view, similar to FIG. 2, but .i 25 showing a modified bracket structure. I
26 FIG. 6 is an axial sectional view through the crank mechanism, 27 and taken along a plane corresponding to line 6-6 of FIG. 5.
29 FIG. 7 is a side elevational view of the chain and sprocket struc- , ~` 30 ture, and taken along a plane corresponding ~o line 7-7 of FIG. 6. I
~i~ 31 ~` 32 .
`11 ~3~6~1`7 1 ¦ FIG. 8 is a sectional view of the attachment bracket and taken 2 along a plane corresponding to line 8-8 of FIG. 5.
4 ¦ FIG. 9 is an axial sectional view similar to FIG. 6, but
nate corresponding parts in the several figures. These drawings 6 are to scale. .
8 FIGURE 1 is a pictorial-view of a drill press to which is.
9 attached an elevator mechanism incorporating the pxesent--inven-10 tion.
11 .' ' , , , 12 FIG. 2 is an enlarged horizontal sectional view through the drill 13 press and attachment, showing the crank mechanism, the view being 14 taken along a plane corresponding to line 2-2 of FIG. 1.
16 FIG. 3 is a segmen~ed vertical sectional view taken along the 17 offset plane corresponding to line 3-3 of FIG. 2.
19 FIG. 4 is an elevational view, partly in section, showing the chain and sprocket structure and taken along the plane indicated .
21 ~y line 4-4 of FIG. 3.
24 FIG. 5 is a horizontal sectional view, similar to FIG. 2, but .i 25 showing a modified bracket structure. I
26 FIG. 6 is an axial sectional view through the crank mechanism, 27 and taken along a plane corresponding to line 6-6 of FIG. 5.
29 FIG. 7 is a side elevational view of the chain and sprocket struc- , ~` 30 ture, and taken along a plane corresponding ~o line 7-7 of FIG. 6. I
~i~ 31 ~` 32 .
`11 ~3~6~1`7 1 ¦ FIG. 8 is a sectional view of the attachment bracket and taken 2 along a plane corresponding to line 8-8 of FIG. 5.
4 ¦ FIG. 9 is an axial sectional view similar to FIG. 6, but
5 I showing a modified crank mechanism in which the crank arm is r-~ y ~on e~te~ to a brake plate.
~;
-5a-. j 1131361~
1 D~TAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
3 The following detailed description is of the bes~ ~presently con- -4 templated modes of carrying out the invention. This description is not to be taken in a limiting sense, but is made-merely for
~;
-5a-. j 1131361~
1 D~TAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
3 The following detailed description is of the bes~ ~presently con- -4 templated modes of carrying out the invention. This description is not to be taken in a limiting sense, but is made-merely for
6 purposes of illustrating the general principles of the invention,
7 since the scope of the invention is best defined by the appended
8 claims.
Structural and opérational characteristics attributed to forms 11 of the invention first described, shall also be attributed to 12 forms later described, unless such characteristics are obviously 13 inapplicable or lLnless specific exception is made.
A conventional drill press 10 shown in FIG. 1 has a table 12 16 clamped to the drill press column 14 by the aid of the usual 17 split collar 16 and draw bolt 18. The table 12 is made as a 18 casting, there being bracket arms 20 (FIG. 2) joining the collar 19 to the work part 22 of the table 12. As used hereinafter, the word "table" refers to the entire part supported on the drill 21 press column.
23 The table 12 is guided for vertical movement by the fitted re-24 lationship of the collar 16 and the column 14. The table 12 rides up and down along a sprocket chain 240 The sprocket chain Z6 24 is suspended from a two part bracket 26 (FIG. 3) clamped to 27 the top of the drill press column 14. Companion parts of the 28 bracket 26 provide a plate 28 in which a circular raceway or 29 channel 30 is formed. A roller bearing 32 rides in the channel 30. The upper end of the chain 24 is attached to the roller 31 bearing 32 by the aid of a C-shaped bracket 34 that encompasses 32 the edge of the plate 28. The bracket 34 locates the chain 24 -6- ~
I
~386~
1 ¦ in alignment with the bearing 32 to maintain a proper tracking 2 ¦ relationship. The' chain 24 extends vertically in spaced Ie-3 ¦ lationship to the drill press column 14.
4 l 5 ¦ The table 12 is connected to the sprocket chain 24 by a sprocket-6 ¦ wheel 36. The sprocket wheel is rotatably mounted on one side of 71 a supporting,block or bracket 38 attached to the table. The 81 sprocket wheel 36 has a hub 40 secured to one end o~ a shaft 42
Structural and opérational characteristics attributed to forms 11 of the invention first described, shall also be attributed to 12 forms later described, unless such characteristics are obviously 13 inapplicable or lLnless specific exception is made.
A conventional drill press 10 shown in FIG. 1 has a table 12 16 clamped to the drill press column 14 by the aid of the usual 17 split collar 16 and draw bolt 18. The table 12 is made as a 18 casting, there being bracket arms 20 (FIG. 2) joining the collar 19 to the work part 22 of the table 12. As used hereinafter, the word "table" refers to the entire part supported on the drill 21 press column.
23 The table 12 is guided for vertical movement by the fitted re-24 lationship of the collar 16 and the column 14. The table 12 rides up and down along a sprocket chain 240 The sprocket chain Z6 24 is suspended from a two part bracket 26 (FIG. 3) clamped to 27 the top of the drill press column 14. Companion parts of the 28 bracket 26 provide a plate 28 in which a circular raceway or 29 channel 30 is formed. A roller bearing 32 rides in the channel 30. The upper end of the chain 24 is attached to the roller 31 bearing 32 by the aid of a C-shaped bracket 34 that encompasses 32 the edge of the plate 28. The bracket 34 locates the chain 24 -6- ~
I
~386~
1 ¦ in alignment with the bearing 32 to maintain a proper tracking 2 ¦ relationship. The' chain 24 extends vertically in spaced Ie-3 ¦ lationship to the drill press column 14.
4 l 5 ¦ The table 12 is connected to the sprocket chain 24 by a sprocket-6 ¦ wheel 36. The sprocket wheel is rotatably mounted on one side of 71 a supporting,block or bracket 38 attached to the table. The 81 sprocket wheel 36 has a hub 40 secured to one end o~ a shaft 42
9 centrally supported in a horizontal bearing aperture of the block 38. The other end of the shaft cooperates with mechanisms 11 to be described hereinafter_ The block or bracket 38 is affixed 12 to the table 12 by the aid of upper-and lower jaws or arms 46 13 and 47. These jaws extend above and below the sprocket wheel 36 14 on one side of the block 38. The jaws project beyond the sprocket _ wheel 36 and respectively overlie the upper and lower end surfaces '16 of the mounting collar 16. Set screws 48 and 49 secure the jaws 17 to the collar. The jaws 46 and 47 are sized and proportioned so 18 that the axis of the sprocket wheel 36 is skew to the chain, and 19 so that the sprocket wheel 36 is spaced from the column 14 to '20 engage the sprocket chain 24. The chain 24 passes through 21 aligned apertures 50 and 51 in the upper and lower attachment 22 jaws 46 and 47.
24 Normally, the draw bolt 18 secures the table to the column 14.
If adjustment of t'he table height is desired, the draw bolt is 26 released. The weight of the table is transmitted through the 27 collar 16 and shaft 42, and tends to cause the sprocket wheel 36 28 to rotate downwardly on the chain 24. Ho~ever, such movement is 29 resisted by a friction brake structure. The brake structure in-~0 cludes a friction plate 54, a brake plate 56, a brake spring 58 31 and a stop nut 60. The stop nut 60 is threadedly mounted on the . .
Il ,~ . . i .
~L~ 3~
1 end of a hub 62 formed on the outside of the block or bràcket 382 remote from the sprocket wheel 36. The frictlon plate 54 sur-3 rounds the hub and is adhered by cement, rivets or other means 4 to the outer face of the bracket 38. The brake plate similarly surrounds the hub 62 and is slideable thereon. A brake spring 6 58 also surrounds the hub and is interposed between the brake 7 plate 56 and the stop nut 60 thus to move the brake plate 56 into 8 firm engagement with the friction plate 54. The brake plate 56 9 is accordingly restrained from rotation.
11 The shaft 42 is connected to the brake plate 56 so that the 12 shaft 42 and sprocket 40 are likewise restrained from rotation.
13 For this purpose, a crank body is attached, as by a set screw 14 64, to the outer end of the shaft 42. The crank body has an outboard block 66 extending over the stop nut 60. The block 16 provides an elongated aperture 68 paralleling the shaft 42.
17 Guided in the aperture 68 is a hollow pawl 70 urged, in turn, by 18 a compression spring 72 to engage ratchet teeth 74 that crown the 19 brake plate 56. A key and pin or other means (not shown~ main-tain the pawl 70 in suitable orientation for engagement with the 21 ratchet teeth 74. Torque tending to rotate the sprocket wheel 22 36 downwardly on the chain 24 tends to rotate the crank body 23 and pawl 70 in a direction to lock against the ratchet teeth 74.
In order to move the shaft 42 to cause the sprocket 40 to climb 26 up or descend down the chain 24, correspondingly to move the 27 table, the crank body is rotated by hand. For this purpose, 28 a handle 78 (see also FIG. 2) is provided. The handle 78 and 29 Grank body together form a crank arm for the shaft 42. The h~dle 78 extends through an aperture 80 in the crank body and 31 is secured by a set screw 82. Movement of the handle 78 and 32 crank body in one direction causes the sprocket wheel 36 to ~^ climb up the sprocket chain as the pawl 70 ratchets over the 3~
1 restrained brake plate 56. Movement of the handle 78 and 2 crank body in the opposite direction forces the brake plate 3 56 to move along the friction plate 54. The brake plate 56 is, 4 at all times, yieldingly restrained.
Movement of the crank handle 78 achieves very rapid adjustment 6 of the table, since the drive between the sprocket wheel 36 and 7 the crank is direct and unencumbered with any additional stage of gearing. An exact position of the table can readily be obtained, 9 since if the discrete ratcheting movement overshoots a desired position, it is merely necessary to force the ratchet teeth in 11 the re~erse direction.
12 ' 13 The angular orientation of the table about the column 14 can be adjusted without requiring any special operations. Thus, as the table is rotated, the chain follows along its overhead channel 1~ 30. -18 To ensure continuous engagement of the chain with the sprocket 19 ¦ wheel, a chain guide 84 is provided (FIG. 4) that is attached to an embossment on the inside of the block or bracket 38. The 21 guide 84 defines with the sprocket wheel 36, a narrow channel for 22 the chain so that it at all times engages the sprocket wheel 36.
23 A weight 86 (FIG. 1) is attached to the lower end of the chain 24 which stabilizes it and,prevents it from whipping about.
~5 ~6 After the table is adjusted, the draw bolt 18 preferrably is re-Z7 tightened so that undue stress need not be absorbed by the chain 28 during work operations.
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_9_ 3~36t37 1 ¦ No part of the drill press need be modified or discarded for 2 ¦ purposes of installation of-the drill-press table elevator.
3 ¦ Installation of the elevator is relatively simple, requiring 41 the placement of the upper chain suspension bracket 26 and the n acket 3~.
~2 28 .
: 30 ` 31
24 Normally, the draw bolt 18 secures the table to the column 14.
If adjustment of t'he table height is desired, the draw bolt is 26 released. The weight of the table is transmitted through the 27 collar 16 and shaft 42, and tends to cause the sprocket wheel 36 28 to rotate downwardly on the chain 24. Ho~ever, such movement is 29 resisted by a friction brake structure. The brake structure in-~0 cludes a friction plate 54, a brake plate 56, a brake spring 58 31 and a stop nut 60. The stop nut 60 is threadedly mounted on the . .
Il ,~ . . i .
~L~ 3~
1 end of a hub 62 formed on the outside of the block or bràcket 382 remote from the sprocket wheel 36. The frictlon plate 54 sur-3 rounds the hub and is adhered by cement, rivets or other means 4 to the outer face of the bracket 38. The brake plate similarly surrounds the hub 62 and is slideable thereon. A brake spring 6 58 also surrounds the hub and is interposed between the brake 7 plate 56 and the stop nut 60 thus to move the brake plate 56 into 8 firm engagement with the friction plate 54. The brake plate 56 9 is accordingly restrained from rotation.
11 The shaft 42 is connected to the brake plate 56 so that the 12 shaft 42 and sprocket 40 are likewise restrained from rotation.
13 For this purpose, a crank body is attached, as by a set screw 14 64, to the outer end of the shaft 42. The crank body has an outboard block 66 extending over the stop nut 60. The block 16 provides an elongated aperture 68 paralleling the shaft 42.
17 Guided in the aperture 68 is a hollow pawl 70 urged, in turn, by 18 a compression spring 72 to engage ratchet teeth 74 that crown the 19 brake plate 56. A key and pin or other means (not shown~ main-tain the pawl 70 in suitable orientation for engagement with the 21 ratchet teeth 74. Torque tending to rotate the sprocket wheel 22 36 downwardly on the chain 24 tends to rotate the crank body 23 and pawl 70 in a direction to lock against the ratchet teeth 74.
In order to move the shaft 42 to cause the sprocket 40 to climb 26 up or descend down the chain 24, correspondingly to move the 27 table, the crank body is rotated by hand. For this purpose, 28 a handle 78 (see also FIG. 2) is provided. The handle 78 and 29 Grank body together form a crank arm for the shaft 42. The h~dle 78 extends through an aperture 80 in the crank body and 31 is secured by a set screw 82. Movement of the handle 78 and 32 crank body in one direction causes the sprocket wheel 36 to ~^ climb up the sprocket chain as the pawl 70 ratchets over the 3~
1 restrained brake plate 56. Movement of the handle 78 and 2 crank body in the opposite direction forces the brake plate 3 56 to move along the friction plate 54. The brake plate 56 is, 4 at all times, yieldingly restrained.
Movement of the crank handle 78 achieves very rapid adjustment 6 of the table, since the drive between the sprocket wheel 36 and 7 the crank is direct and unencumbered with any additional stage of gearing. An exact position of the table can readily be obtained, 9 since if the discrete ratcheting movement overshoots a desired position, it is merely necessary to force the ratchet teeth in 11 the re~erse direction.
12 ' 13 The angular orientation of the table about the column 14 can be adjusted without requiring any special operations. Thus, as the table is rotated, the chain follows along its overhead channel 1~ 30. -18 To ensure continuous engagement of the chain with the sprocket 19 ¦ wheel, a chain guide 84 is provided (FIG. 4) that is attached to an embossment on the inside of the block or bracket 38. The 21 guide 84 defines with the sprocket wheel 36, a narrow channel for 22 the chain so that it at all times engages the sprocket wheel 36.
23 A weight 86 (FIG. 1) is attached to the lower end of the chain 24 which stabilizes it and,prevents it from whipping about.
~5 ~6 After the table is adjusted, the draw bolt 18 preferrably is re-Z7 tightened so that undue stress need not be absorbed by the chain 28 during work operations.
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_9_ 3~36t37 1 ¦ No part of the drill press need be modified or discarded for 2 ¦ purposes of installation of-the drill-press table elevator.
3 ¦ Installation of the elevator is relatively simple, requiring 41 the placement of the upper chain suspension bracket 26 and the n acket 3~.
~2 28 .
: 30 ` 31
-10-113~16B7 2 . ~ .
3 In the form of the invention shown in FIGS. ~ through 8, a 4 bracket 100 rotatably mounts a sprocket wheel 102 as well as a guide 104 (FIG. 7) for the sprocket chain 106. As in the pre-6 vious form, the bracket 100 carries a friction plate 108 and a 7 ratchet crowned brake plate 110.
9 The bracket 100 in the present form is attached not to the collar 112 of the drill press table, but instead to one of the
3 In the form of the invention shown in FIGS. ~ through 8, a 4 bracket 100 rotatably mounts a sprocket wheel 102 as well as a guide 104 (FIG. 7) for the sprocket chain 106. As in the pre-6 vious form, the bracket 100 carries a friction plate 108 and a 7 ratchet crowned brake plate 110.
9 The bracket 100 in the present form is attached not to the collar 112 of the drill press table, but instead to one of the
11 ribs or arms 114 radiati-ng therefrom. For this purpose, a clamp
12 116 is attached to the rib 114 (FIG. 8) as by providing a
13 channel 118 for receiving the rib. Set screws 120 secure the
14 clamp 116. The clamp 116 is connected to the sprocket bearing bracket 100 by the aid of a bar 122. Slots 130 and 132 (FIG. 5) 16 in the bar allow passage of attachment bolts 126 and 128 that 17 respectively engage the clamp 116 and the bracket 100 from 18 below (see also FIG. 6)~ The bar adequately offsets the elevator assembly from beneath the drill press table. The slots 130 and 132 in the bar allow the sprocket wheel bracket 100 to be moved 22 angularly and linearly to align the sprocket whee-l 102 with the 23 suspended sprocket chain.
24 Although the alternative embodiment includes parts identical to those of the preferred embodiment, various changes of components 26 can be made. For example, the brake plate, instead of having l, 27 ratchet teeth formed as a crown, could be formed at the edge for 28 a less compact arrangement. Furthermore, one way drive mechanisms 29 other than ratchet mechanisms could be used.
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1 1~38~37 1 SCRIPTION ~P SECO~D ~LTE~NATIVE EM~ODIMENT
3 In the form of the invention shown in FIG. 9, a bracket 150 4 similar to the bracket 100 of the previous form is attached to the drill press table by suitable means. ~he bracket 150 6 rotatably supports a crank shaft 152. ~ sprocket wheel 154 is 7 mounted on one end of the crank shaft 152 for engagement with 8 the sprocket chain 156 as before. The other end of the crank 9 shaft is angled to form a crank arm 158 and handle 160.
11 A~gular movement of the crank mechanism is restrained by a 12 friction brake structure that includes a friction plate 162, a 13 brake plate 164, a brake spring 166 and a stop nut 168, all 14 similar to the brake structure of the previous forms. In the present instance, howe~er, the crank arm 158 is directly, rather 16 than indirectly, coupled to the brake plate 164. For this pur-17 po~e, the crank arm 158 carries a drive pin 170 that enters a 18 peripheral slot or recess 172 in the brake plate 164.
Downward adjustment of the table is accomplished by moving the 21 crank mechanism in one direction. As in the previous forms, 22 gravity assists in overcoming the friction force of the brake 23 structure. Upward adjustment of the table is accomplished by 24 moving the crank mechanism in the other direction. In the pre-sent instance, no one way drive mechanism is provided; hence, 26 both gravity and the friction force must be overcome. To com-27 pensate for the increased effort required for upward movement of 28 the table, the crank arm 158 may be lengthened. The structure, 29 however, retains major advantages of the forms previously des-cribed by allowing rapid adjustment of table height.
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24 Although the alternative embodiment includes parts identical to those of the preferred embodiment, various changes of components 26 can be made. For example, the brake plate, instead of having l, 27 ratchet teeth formed as a crown, could be formed at the edge for 28 a less compact arrangement. Furthermore, one way drive mechanisms 29 other than ratchet mechanisms could be used.
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1 1~38~37 1 SCRIPTION ~P SECO~D ~LTE~NATIVE EM~ODIMENT
3 In the form of the invention shown in FIG. 9, a bracket 150 4 similar to the bracket 100 of the previous form is attached to the drill press table by suitable means. ~he bracket 150 6 rotatably supports a crank shaft 152. ~ sprocket wheel 154 is 7 mounted on one end of the crank shaft 152 for engagement with 8 the sprocket chain 156 as before. The other end of the crank 9 shaft is angled to form a crank arm 158 and handle 160.
11 A~gular movement of the crank mechanism is restrained by a 12 friction brake structure that includes a friction plate 162, a 13 brake plate 164, a brake spring 166 and a stop nut 168, all 14 similar to the brake structure of the previous forms. In the present instance, howe~er, the crank arm 158 is directly, rather 16 than indirectly, coupled to the brake plate 164. For this pur-17 po~e, the crank arm 158 carries a drive pin 170 that enters a 18 peripheral slot or recess 172 in the brake plate 164.
Downward adjustment of the table is accomplished by moving the 21 crank mechanism in one direction. As in the previous forms, 22 gravity assists in overcoming the friction force of the brake 23 structure. Upward adjustment of the table is accomplished by 24 moving the crank mechanism in the other direction. In the pre-sent instance, no one way drive mechanism is provided; hence, 26 both gravity and the friction force must be overcome. To com-27 pensate for the increased effort required for upward movement of 28 the table, the crank arm 158 may be lengthened. The structure, 29 however, retains major advantages of the forms previously des-cribed by allowing rapid adjustment of table height.
31 __ .
Claims (13)
1. For use with a drill press having a column and a table mounted for vertical movement on the column:
a) a sprocket chain suspended from the drill press and extending vertically along the side of the column, b) a bearing block or bracket;
c) a shaft mounted by the bearing block for rotation.
about its axis;
d) means connecting the bearing block to the drill press table to orient the shaft axis substantially horizontally;
e) a sprocket wheel rotatably mounted by the block and in engagement with the sprocket chain so that angular movement of the sprocket wheel is accom-panied by corresponding vertical movement of the drill press table;
f) a yieldable friction brake continuously restraining angular movement of the sprocket wheel; and g) manual drive means for rotating the sprocket wheel whereby the table can be quickly elevated and lowered.
a) a sprocket chain suspended from the drill press and extending vertically along the side of the column, b) a bearing block or bracket;
c) a shaft mounted by the bearing block for rotation.
about its axis;
d) means connecting the bearing block to the drill press table to orient the shaft axis substantially horizontally;
e) a sprocket wheel rotatably mounted by the block and in engagement with the sprocket chain so that angular movement of the sprocket wheel is accom-panied by corresponding vertical movement of the drill press table;
f) a yieldable friction brake continuously restraining angular movement of the sprocket wheel; and g) manual drive means for rotating the sprocket wheel whereby the table can be quickly elevated and lowered.
2. The combination as set forth in claim 1 in which said manual drive means includes a ratchet mechanism causing the friction brake to yield upon movement of the sprocket wheel in a down direction, and causing said friction brake to maintain position upon movement of the sprocket wheel in an up direction.
3. The combination as set forth in claim l in which said sprocket chain is suspended by a circular track coaxial with the column and by a bearing or wheel freely movable along the track whereby angular movement of the table about the column causes corresponding movement of the sprocket chain.
4. The combination as set forth in claim 1 in which said manual drive means is directly connected to said friction brake so that said brake is caused to yield during both upward and downward adjustment of the drill press table.
5. The combination as set forth in claim 1 in which said manual drive means is indirectly connected to said friction brake by the aid of a one way drive mechanism so that said brake need not yield during upward adjustment of the drill press table; the force of gravity exerted on said brake mechanism assisting said manual drive means in overcoming the friction force of said brake during downward adjustment of the drill press table.
6. For use with a drill press having a column, a table having a collar mounted on the column and a sprocket chain suspended to extend vertically along the side of the column:
a) a bearing block or bracket;
b) a shaft mounted by the bearing block for rotation about its axis;
c) means connecting the bearing block to the drill press table to orient the shaft axis substantially hori-zontally;
d) a sprocket wheel carried by the shaft and in engage-ment with the sprocket chain so that angular movement of the sprocket wheel is accompanied by corresponding vertical movement of the drill press table;
e) yieldable friction brake means continuously restraining angular movement of the sprocket wheel; and f) manual drive means for rotating the sprocket wheel shaft whereby the table can be quickly elevated and lowered.
a) a bearing block or bracket;
b) a shaft mounted by the bearing block for rotation about its axis;
c) means connecting the bearing block to the drill press table to orient the shaft axis substantially hori-zontally;
d) a sprocket wheel carried by the shaft and in engage-ment with the sprocket chain so that angular movement of the sprocket wheel is accompanied by corresponding vertical movement of the drill press table;
e) yieldable friction brake means continuously restraining angular movement of the sprocket wheel; and f) manual drive means for rotating the sprocket wheel shaft whereby the table can be quickly elevated and lowered.
7. The combination as set forth in claim 6 in which said con-necting means comprises a pair of jaws or arms extending from said block or bracket and releasably clamped to opposite end surfaces of said table collar.
8. The combination as set forth in claim 7 in which said jaws or arms respectively project above and below said sprocket wheel, said jaws or arms having clearance openings through which said sprocket chain passes.
9. The combination as set forth in claim 6 in which said con-necting means comprises a clamp attached to part of the table and a slotted bar attached both to the clamp and said bearing block or bracket, said slotted bar allowing longitudinal and angular movement of the bearing block to align said sprocket wheel to the chain.
10. An attachment for a drill press having a column, a table including a collar mounted on the column for vertical movement thereon:
a) a sprocket chain assembly including a sprocket chain and means supporting the chain adjacent the top of the column so that the chain extends verti-cally downwardly along the column;
b) a sprocket wheel in continuous engagement with the sprocket chain;
c) bracket means detachably connected to said table and mounting said sprocket wheel for angular move-ment about a substantially horizontal axis;
d) yielding brake means continuously restraining movement of said sprocket wheel; and e) manual drive means for rotating the sprocket wheel.
a) a sprocket chain assembly including a sprocket chain and means supporting the chain adjacent the top of the column so that the chain extends verti-cally downwardly along the column;
b) a sprocket wheel in continuous engagement with the sprocket chain;
c) bracket means detachably connected to said table and mounting said sprocket wheel for angular move-ment about a substantially horizontal axis;
d) yielding brake means continuously restraining movement of said sprocket wheel; and e) manual drive means for rotating the sprocket wheel.
11. An attachment fox a drill press having a column, a table including a collar mounted on the column for vertical movement thereon:
a) a sprocket chain assembly including a sprocket chain and means supporting the.chain adjacent the top of the column.so that the chain extends vertically downwardly along the column;
b) a sprocket wheel in continuous engagement with the sprocket chain;
c) bracket means detachably connected to said table and mounting said sprocket wheel for angular movement about a substantially horizontal axis;
d) a crank directly coupled to the sprocket wheel;
e) a friction brake assembly, including a brake plate, a friction plate and a spring for urging the brake plate to engage the friction plate; and f) means forming a ratchet connection between the crank and the brake plate for override ratchet movement therebetween upon movement of the crank in a direction to rotate the sprocket wheel upwardly of the chain and for driving relationship therebetween against the force of said friction brake assembly upon movement of the crank in a direction to rotate the sprocket wheel downwardly of the chain.
a) a sprocket chain assembly including a sprocket chain and means supporting the.chain adjacent the top of the column.so that the chain extends vertically downwardly along the column;
b) a sprocket wheel in continuous engagement with the sprocket chain;
c) bracket means detachably connected to said table and mounting said sprocket wheel for angular movement about a substantially horizontal axis;
d) a crank directly coupled to the sprocket wheel;
e) a friction brake assembly, including a brake plate, a friction plate and a spring for urging the brake plate to engage the friction plate; and f) means forming a ratchet connection between the crank and the brake plate for override ratchet movement therebetween upon movement of the crank in a direction to rotate the sprocket wheel upwardly of the chain and for driving relationship therebetween against the force of said friction brake assembly upon movement of the crank in a direction to rotate the sprocket wheel downwardly of the chain.
12. An attachment for a drill press having a column, a table including a collar mounted on the column for vertical movement thereon:
a) a sprocket chain assembly including a sprocket chain and means supporting the chain adjacent the top of the column so that the chain extends vertically downwardly along-the column;
b) a bearing block or bracket;
c) a shaft mounted by the block or bracket for rotation about its axis;
d) means attaching the bearing block or bracket to the table so that said sprocket wheel extends substantially horizontally with its axis skew to the chain;
e) a sprocket wheel mounted on the shaft and continuously engaging said sprocket chain;
f) a crank connected to the shaft for rotating the sprocket wheel to cause upward and downward movement of the table;
g) a relatively non-rotary friction member surrounding the shaft;
h) a brake plate rotatably mounted on the bearing block and having a face engageable with the friction member;
i) a spring urging the brake plate to engage the friction member;
j) said brake plate having a circular array of ratchet teeth thereon;
k) a ratchet pawl connected to the crank and engageable with said ratchet teeth;
l) said ratchet teeth being oriented to allow override ratchet movement of the pawl upon movement of the crank in a direction to raise the sprocket wheel, and to cause engagement and yielding movement of the brake plate upon movement of the crank in a direction to lower the sprocket wheel whereby said table is rapidly elevated and lowered.
a) a sprocket chain assembly including a sprocket chain and means supporting the chain adjacent the top of the column so that the chain extends vertically downwardly along-the column;
b) a bearing block or bracket;
c) a shaft mounted by the block or bracket for rotation about its axis;
d) means attaching the bearing block or bracket to the table so that said sprocket wheel extends substantially horizontally with its axis skew to the chain;
e) a sprocket wheel mounted on the shaft and continuously engaging said sprocket chain;
f) a crank connected to the shaft for rotating the sprocket wheel to cause upward and downward movement of the table;
g) a relatively non-rotary friction member surrounding the shaft;
h) a brake plate rotatably mounted on the bearing block and having a face engageable with the friction member;
i) a spring urging the brake plate to engage the friction member;
j) said brake plate having a circular array of ratchet teeth thereon;
k) a ratchet pawl connected to the crank and engageable with said ratchet teeth;
l) said ratchet teeth being oriented to allow override ratchet movement of the pawl upon movement of the crank in a direction to raise the sprocket wheel, and to cause engagement and yielding movement of the brake plate upon movement of the crank in a direction to lower the sprocket wheel whereby said table is rapidly elevated and lowered.
13. The combination as set forth in claim 12 in which said sprocket chain assembly includes means forming a circular track, a rolling member supported in the track and connected to the upper end of the chain whereby the chain moves angularly about the axis of the column upon angular movement of the drill press table.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US6398879A | 1979-08-06 | 1979-08-06 | |
| US63,988 | 1979-08-06 | ||
| US12427980A | 1980-02-25 | 1980-02-25 | |
| US124,279 | 1980-02-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1138687A true CA1138687A (en) | 1983-01-04 |
Family
ID=26744029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000356461A Expired CA1138687A (en) | 1979-08-06 | 1980-07-18 | Elevator for drill press table |
Country Status (7)
| Country | Link |
|---|---|
| AU (1) | AU6020280A (en) |
| BR (1) | BR8004801A (en) |
| CA (1) | CA1138687A (en) |
| DE (1) | DE3029797A1 (en) |
| FR (1) | FR2462956A1 (en) |
| GB (1) | GB2055638B (en) |
| IT (1) | IT8049432A0 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5960531A (en) * | 1995-09-22 | 1999-10-05 | Black & Decker Inc. | Drill press with switched reluctance motor |
| EP0875335A3 (en) * | 1997-04-30 | 1999-04-14 | Black & Decker Inc. | Drill press having switched reluctance motor |
| US5902077A (en) * | 1998-03-20 | 1999-05-11 | Marking Methods, Inc. | Variable speed universal drilling tapping and reaming machine |
| CN102975030B (en) * | 2011-09-07 | 2015-07-29 | 陈玉争 | Magnetic working table |
| CN108555336B (en) * | 2018-03-12 | 2021-03-30 | 太原市三高能源发展有限公司 | Intelligent automobile part drilling machine |
| CN114871790B (en) * | 2022-04-21 | 2022-11-22 | 黄山和泰汇精密科技有限公司 | Intelligent CNC machine tool based on digital control |
-
1980
- 1980-07-08 AU AU60202/80A patent/AU6020280A/en not_active Abandoned
- 1980-07-17 GB GB8023443A patent/GB2055638B/en not_active Expired
- 1980-07-18 CA CA000356461A patent/CA1138687A/en not_active Expired
- 1980-07-31 BR BR8004801A patent/BR8004801A/en unknown
- 1980-08-04 FR FR8017189A patent/FR2462956A1/en active Granted
- 1980-08-06 DE DE19803029797 patent/DE3029797A1/en not_active Withdrawn
- 1980-08-06 IT IT8049432A patent/IT8049432A0/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| IT8049432A0 (en) | 1980-08-06 |
| GB2055638B (en) | 1983-03-16 |
| DE3029797A1 (en) | 1981-02-26 |
| BR8004801A (en) | 1981-02-10 |
| FR2462956A1 (en) | 1981-02-20 |
| AU6020280A (en) | 1981-02-12 |
| GB2055638A (en) | 1981-03-11 |
| FR2462956B3 (en) | 1982-05-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |