US3897166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill feed control
Assignee: Individual
•
Filing: 1974-04-15
•
Granted: 1975-07-29
•
Expires: 1994-04-15
Abstract
Abstract Feed control comprises a frame attached to a drill motor and carrying an axially slidable guide shaft with a pressure foot at forward end to contact a work piece to be drilled. A lead screw is carried by the frame and rotatable about an axis parallel to the axis of the drill motor and drill bit. A nut member carried by the guide shaft engages the lead screw and prevents retraction of the guide shaft and relative advance of drill bit toward and into the work piece when axial force is applied. A drive train connected to the lead screw and the drive shaft rotates the former when the latter is rotated, and enables the nut member to ''''back off'''' along the lead screw so that the guide shaft retracts gradually at a predetermined rate and the bit advances at a corresponding rate. Since the bit cannot advance freely and independently, it cannot surge or jam when it breaks through the rear of the work piece. In preferred form, a clutch is provided in the drive train and actuated by load on pressure foot, which prevents backing off when not actually drilling. Device works in same way when applied to drill press or power feed machines mounted on fixtures or work pieces.
Inventors
- 👤 Ralph D Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:01
CPC Classifications
B; B23; B23Q; B23Q5/00; B23Q5/22; B23Q5/34; B23Q5/38; B23Q5/40; B23Q5/406; A; A61; A61B; A61B17/00; A61B17/16; Y; Y10; Y10T; Y10T408/00; Y10T408/18; Y10T408/65; Y10T408/675; Y10T408/6771
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
257 words
In a drill press for driving a drill bit to bore a hole in a workpiece, said drill press having a stationary spindle housing, and a spindle guide axially slidable therein, a feed control comprising: a frame attached to said axially slidable spindle guide, a drive shaft for said drill bit rotatably supported by said spindle guide and journalled in said frame, said drill bit being chucked to said drive shaft, a lead screw rotatably supported in said frame and being slidably supported therein for limited axial movement without rotation of the lead screw, a guide shaft axially slidable in said frame parallel to said lead screw, a stop fixed on said guide shaft and a stationary cooperating reference stop engageable thereby mounted on said drill press in a position fixed relative to said spindle housing to establish an approximate starting position with the tip of the drill in proximity to the workpiece, a detent fixed on said guide shaft and engaging the threads of said lead screw to prevent axial advancement of said frame and drill bit in response to axial pressure exerted on the frame, in absence of rotation of the lead screw, and drive means between said drive shaft and said lead screw to cause rotation of said lead screw in response to rotation of the drive shaft, said lead screw cooperating with said detent means enGaged therewith to allow said axial advancement of said frame and said drill bit on said drive shaft to occur under such axial pressure exerted on said frame.
Claim 2
Dependent Claim
257 words
In a drill press for driving a drill bit to bore a hole in a workpiece, said drill press having a stationary spindle housing, and a spindle guide axially slidable therein, a feed control comprising: a frame attached to said axially slidable spindle guide, a drive shaft for said drill bit rotatably supported by said spindle guide and journalled in said frame, said drill bit being chucked to said drive shaft, a lead screw rotatably supported in said frame and being slidably supported therein for limited axial movement without rotation of the lead screw, a guide shaft axially slidable in said frame parallel to said lead screw, a stop fixed on said guide shaft and a stationary cooperating reference stop engageable thereby mounted on said drill press in a position fixed relative to said spindle housing to establish an approximate starting position with the tip of the drill in proximity to the workpiece, a detent fixed on said guide shaft and engaging the threads of said lead screw to prevent axial advancement of said frame and drill bit in response to axial pressure exerted on the frame, in absence of rotation of the lead screw, and drive means between said drive shaft and said lead screw to cause rotation of said lead screw in response to rotation of the drive shaft, said lead screw cooperating with said detent means enGaged therewith to allow said axial advancement of said frame and said drill bit on said drive shaft to occur under such axial pressure exerted on said frame.
Claim 3
Dependent Claim
18 words
The subject matter of claim 1, wherein said reference stop is on and projects from said spindle housing.
Claim 4
Dependent Claim
41 words
The subject matter of claim 1, wherein: said guide shaft has an end protruding from said frame in a direction oppositely from that of the drill bit, and said stop on said guide shaft is engageable with said stationary reference stop.
Claim 5
Dependent Claim
58 words
A feed control as claimed in claim 3, further including an abutment on said guide shaft facing oppositely from that of the drill bit, and a stop mounted on said frame located in the path of movement of said abutment to engage the abutment and limit the advance of the frame and drill bit to a predetermined extent.
Claim 6
Dependent Claim
40 words
The subject matter of claim 1, including clutch elements in said drive means drivingly engaged by virtue of said limited axial movement of said lead screw in said frame in first response to said axial pressure exerted on said frame.
Claim 7
Dependent Claim
29 words
The subject matter of claim 3, including clutch elements in said drive means drivingly engaged by virtue of said limited axial movement of said lead screw in said frame.
References Cited (Backward Citations)
US2784616A
Cited
US3679320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |