US3971281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Angle shears with divided shear cutting members
Assignee: Individual
•
Filing: 1975-02-11
•
Granted: 1976-07-27
•
Expires: 1995-02-11
Abstract
Abstract An angle shears with two shear cutting members for cuts in two directions. The two shear cutting members are arranged to be moved independently of each other and have a divided drive. The cutting edges of the shear cutting members are arranged at small angles to the surface of the sheet metal to be cut.
Inventors
- 👤 Walter Bredow
- 👤 Walter Tamaschke
- 👤 Gunther Rott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:45
CPC Classifications
B; B23; B23D; B23D15/00; B23D15/06; B23D15/002; B23D31/00; B23D31/02; B23D35/00; B23D35/005; Y; Y10; Y10T; Y10T83/00; Y10T83/808; Y10T83/825; Y10T83/869; Y10T83/8821; Y10T83/8828; Y10T83/8831; Y10T83/8834; Y10T83/8841; Y10T83/8847; Y10T83/8854; Y10T83/8867; Y10T83/8868; Y10T83/929; Y10T83/9457; Y10T83/9473; Y10T83/9483; Y10T83/9486
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
142 words
An angle shears for cutting sheet metal and the like including two shear cutting members for cuts in two directions, the shear cutting members having cutting edges, means arranging one shear cutting member in the X-direction and the other shear cutting member in the Y-direction to be capable of moving independently of each other, the cutting edges of the shear cutting members being inclined at small angles to the surface of the sheet metal to be cut, a divided drive for said shear cutting members including threaded spindles operably connected to the shear cutting members whereby rotation of the spindles in one direction moves the shear members in a first direction and rotation of the spindles in a second direction moves the shear members in the opposite direction, and a positional sensor for sensing the vertical position of the shear cutting members.
Claim 2
Dependent Claim
142 words
An angle shears for cutting sheet metal and the like including two shear cutting members for cuts in two directions, the shear cutting members having cutting edges, means arranging one shear cutting member in the X-direction and the other shear cutting member in the Y-direction to be capable of moving independently of each other, the cutting edges of the shear cutting members being inclined at small angles to the surface of the sheet metal to be cut, a divided drive for said shear cutting members including threaded spindles operably connected to the shear cutting members whereby rotation of the spindles in one direction moves the shear members in a first direction and rotation of the spindles in a second direction moves the shear members in the opposite direction, and a positional sensor for sensing the vertical position of the shear cutting members.
Claim 3
Dependent Claim
48 words
The angle shears in accordance with claim 1 including lower knives respectively cooperating with the two shear cutting members, and adjustment means connected to said lower knives for adjusting the lower knives whereby the cutting gap between the shear cutting members and the lower knives can be adjusted.
Claim 4
Dependent Claim
24 words
The angle shears in accordance with claim 2 characterized in that the adjustment means for the lower knives are provided by screw threaded spindles.
Claim 5
Dependent Claim
19 words
The angle shears in accordance with claim 3 in which the screw threaded spindles co-operate with ball train nuts.
Claim 6
Dependent Claim
36 words
The angle shears in accordance with claim 3 in which an angle transmission connects the screw threaded spindles for the lower knives in the X-direction and the threaded spindles for the lower knives in the Y-direction.
Claim 7
Dependent Claim
60 words
The angle shears in accordance with claim 5 characterized in that the lower knives for the X-direction and the lower knives for the Y-direction are guided by means of guide projections in guide grooves and the grooves are arranged at an angle of 45° with respect to the directions of cut X and Y parallel to the plane of cutting.
Claim 8
Dependent Claim
57 words
The angle shears in accordance with claim 2 characterized in that the drive for the two lower knives is constructed as a manual drive or a motor drive and the positional measurement for the two lower knives in the X and Y directions is arranged to be carried out by means of a lower knife threaded spindle.
Claim 9
Dependent Claim
41 words
The angle shears in accordance with claim 7 characterized in that the position of the shear cutting members in the X and Y directions is determined respectively by a positional sensor, which is mechanically coupled with the ball train threaded spindle.
Claim 10
Dependent Claim
38 words
The angle shears in accordance with claim 8 characterized in that as positional sensors single or multi turn potentiometers are provided, in the case of which the wiper position of the potentiometers represents the respective positional actual value.
Claim 11
Dependent Claim
38 words
The angle shears in accordance with claim 8 characterized in that as positional sensors use is made of completely digital positional sensors, in the case of which the respective positional actual value is represented by a digital signal.
Claim 12
Dependent Claim
41 words
The angle shears in accordance with claim 8 characterized in that as positional sensors use is made of photo-electric or electro-magnetic pulse sensors, in the case of which the respective position can be represented by forward and backward counting of pulses.
Claim 13
Dependent Claim
50 words
The angle shears in accordance with claim 8 characterized in that for regulation of the position of the shear cutting members the difference between the positional actual values represented by positional sensors on the shear cutting members in the X and Y directions and pre-established positional target values is employed.
Claim 14
Dependent Claim
38 words
The angle shears in accordance with claim 12 characterized in that for stabilizing a regulating circuit for the shear cutting member drive a voltage is employed which is proportional to the speed of rotation of the threaded spindle.
Claim 15
Dependent Claim
23 words
The angle in accordance with claim 13 characterized in that the voltage produced for stabilizing the regulating circuit is obtained from a tachogenerator.
Claim 16
Dependent Claim
45 words
The angle shears in accordance with claim 12 characterized in that the respective positional target values of the shear cutting members in the X and Y directions can be represented jointly by a program in conjunction with a numerical control system for the angle shears.
References Cited (Backward Citations)
US1446460A
Cited
US1876902A
Cited
US2047322A
Cited
US3308702A
Cited
US3174375A
Cited
US3568557A
Cited
US3528332A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |