US4251174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roller hold down
Assignee: McDonnell Douglas Corp
•
Filing: 1979-02-28
•
Granted: 1981-02-17
•
Expires: 1999-02-28
Abstract
Abstract A roller hold down is designed to restrain parts being cut from a stack of flat sheets. The roller hold down eliminates the need for secondary fastening means to restrain the parts during the cutting operation. The parts are restrained in position on a flat worktable by a pair of cylindrical rollers adjacent the cutter which force the parts against the table. By use of the roller hold down, the restraining force applied through the rollers follows the excursions of the cutter and is applied near the cutter where the force is the most effective.
Inventors
- 👤 Walter I. Satler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:36
CPC Classifications
B; B23; B23C; B23C1/00; B23C1/06; B23Q; B23Q3/00; B23Q3/002; Y; Y10; Y10S; Y10S409/00; Y10S409/903; Y10T; Y10T408/00; Y10T408/55; Y10T408/561; Y10T408/5623; Y10T409/00; Y10T409/30; Y10T409/304088; Y10T409/304144; Y10T409/304312; Y10T409/306216; Y10T409/306384; Y10T409/306664; Y10T409/306776; Y10T409/307056; Y10T409/307112
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
216 words
A restraining mechanism, for use on a machine having a flat base section and a head section which move with respect to each other in a plane parallel to the plane of said flat base section, said mechanism being capable of transmitting a restraining force in a Z direction perpendicular to the plane of said flat base section, to hold a flat part location between said head section and said base section against said flat base section while said base section and said head section move with respect to each other comprising: cylindrical roller means to contact said flat part located on said flat base section and maintain rolling contact with said part while moving along an X axis perpendicular to said Z direction and parallel to the plane of the flat base section; bearing means, to contact said roller on the side opposite said part to be held, to transmit the restraining force to said roller, said bearing means being in contact with said rollers while moving along a Y-axis perpendicular to said X-axis and parallel to the plane of said base section; extensible means attached to said bearing means to apply said Z directional restraining force to said bearing means; and attachment means interconnecting said extensible means to said head section of said machine.
Claim 2
Dependent Claim
216 words
A restraining mechanism, for use on a machine having a flat base section and a head section which move with respect to each other in a plane parallel to the plane of said flat base section, said mechanism being capable of transmitting a restraining force in a Z direction perpendicular to the plane of said flat base section, to hold a flat part location between said head section and said base section against said flat base section while said base section and said head section move with respect to each other comprising: cylindrical roller means to contact said flat part located on said flat base section and maintain rolling contact with said part while moving along an X axis perpendicular to said Z direction and parallel to the plane of the flat base section; bearing means, to contact said roller on the side opposite said part to be held, to transmit the restraining force to said roller, said bearing means being in contact with said rollers while moving along a Y-axis perpendicular to said X-axis and parallel to the plane of said base section; extensible means attached to said bearing means to apply said Z directional restraining force to said bearing means; and attachment means interconnecting said extensible means to said head section of said machine.
Claim 3
Dependent Claim
18 words
The restraining mechanism of claim 1 wherein said rroller means comprises two parallel rollers which contact said part.
Claim 4
Dependent Claim
29 words
The restraining mechanism of claim 2 wherein said bearing means are caster bearings that contact said rollers on the side of the rollers opposite the part to be restrained.
Claim 5
Dependent Claim
29 words
The restraining mechanism of claim 2 wherein said bearing means are journal bearings that contact said rollers on the side of the roller opposite the part to be restrained.
Claim 6
Dependent Claim
18 words
The restraining mechanism of claims 3 or 4 wherein said extensible means comprises a fluid-activated piston and cylinder.
Claim 7
Dependent Claim
191 words
A restraining device for use on a machine with a head and a flat base, said head and said base moving with respect to each other in a plane parallel to said flat base, said head containing a cutter, said device to transmit a restraining force in a Z direction from said head toward said base to hold a flat part against said base during a cutting operation comprising: two parallel cylindrical rollers located on opposite sides of said cutter to contact said part and maintain rolling engagement with said part on said base while moving along an X-axis in a plane parallel to said flat base and perpendicular to said Z direction; bearing means to engage said rollers on the side of the rollers opposite said part to transmit said restraining force to the rollers while moving along a Y-axis in engagement with said rollers in a plane parallel to said flat base and perpendicular to said X direction; extensible means attached to said bearing means to apply said Z directional restaining force to said bearing means; and attachment means interconnecting said extensible means to said head of said machine.
Claim 8
Dependent Claim
191 words
A restraining device for use on a machine with a head and a flat base, said head and said base moving with respect to each other in a plane parallel to said flat base, said head containing a cutter, said device to transmit a restraining force in a Z direction from said head toward said base to hold a flat part against said base during a cutting operation comprising: two parallel cylindrical rollers located on opposite sides of said cutter to contact said part and maintain rolling engagement with said part on said base while moving along an X-axis in a plane parallel to said flat base and perpendicular to said Z direction; bearing means to engage said rollers on the side of the rollers opposite said part to transmit said restraining force to the rollers while moving along a Y-axis in engagement with said rollers in a plane parallel to said flat base and perpendicular to said X direction; extensible means attached to said bearing means to apply said Z directional restaining force to said bearing means; and attachment means interconnecting said extensible means to said head of said machine.
Claim 9
Dependent Claim
17 words
The device of claim 6 wherein said bearing means comprises caster bearings for engagement with said rollers.
Claim 10
Dependent Claim
17 words
The device of claim 6 wherein said bearing means comprises journal bearings for engagement with said rollers.
Claim 11
Independent Claim
16 words
The device of claims 7 or 8 wherein said extensible means comprises cylinder and piston means.
Claim 12
Independent Claim
23 words
The device of claims 7 or 8 wherein vacuum means is provided surrounding the cutter for removing chips formed in the cutting operation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |