Merritt A Jacob

US Patent:

49861832, Jan 22, 1991

Filed:

Oct 24, 1989

Appl. No.:

7/426081

Inventors:

Merritt Jacob - Allentown PA
Gerald L. Oswald - New Ringgold PA
Glen P. Goffin - Newtown PA

Assignee:

Atlas Powder Company - Dallas TX

International Classification:

F42C 1540

US Classification:

102200

Abstract:

In the field of blasting, it is often desirable to ignite explosives at various relative times. Such delayed ignition can have advantages in better break up of rock and reduced ground vibration. A principle problem in using the time delay technique is the accuracy rate of a local oscillator which measures the delay time for each of the delay circuits. In the described system, a calibration interval, independent of any delay time, is transmitted from a control unit concurrently to each of the delay circuits wherein each delay circuit counts the output of its local oscillator during the calibration interval. This local oscillator output is then compared to a predetermined reference count, either at the delay circuit or at the control unit, and a correction factor is established. This correction factor is then applied to a delay count for the individual delay circuit. The delay count is modified to produce a corrected delay count that is utilized individually within the delay circuits to count the output of the corresponding local oscillator for determining the delay time until ignition.

US Patent:

51626063, Nov 10, 1992

Filed:

Nov 8, 1991

Appl. No.:

7/789621

Inventors:

Merritt Jacob - Allentown PA

Assignee:

Atlas Powder Company - Dallas TX

International Classification:

F42B 310
C06C 500

US Classification:

102301

Abstract:

Modular components including donor units (20), relay units (30), and detonator units (50) create a variety of blasting systems. A donor unit (20) is formed from a signal transmission tube (22) having donor mini-caps (24) attached to each end thereof. A relay unit (30) is a device having a receptacle (32) at one end to receive a donor mini-cap in operative association and engaging means (34) to operatively engage a point along another donor unit such that the detonator contained within the relay unit (30) will initiate the transmission lines passing through the donor unit. A detonator unit (50) is provided for the initiation of explosives such as boosters and primers and comprises a shell for receiving explosives and a receptacle at one end suitable for receiving a donor mini-cap (24) at the other end. Relay units (30) allow for the simultaneous initiation of several donor units. Each donor unit can be attached to either additional relay units or to detonator units (50).

US Patent:

50867024, Feb 11, 1992

Filed:

Feb 20, 1991

Appl. No.:

7/657997

Inventors:

Merritt Jacob - Allentown PA

Assignee:

Atlas Powder Company - Dallas TX

International Classification:

C06C 504
F42B 310
F42C 1910

US Classification:

1022755

Abstract:

Modular components including donor units (20), relay units (30), and detonator units (50) create a variety of blasting systems. A donor unit (20) is formed from a signal transmission tube (22) having donor mini-caps (24) attached to each end thereof. A relay unit (30) is a device having a receptacle (32) at one end to receive a donor mini-cap in operative association and engaging means (34) to operatively engage a point along another donor unit such that the detonator contained within the relay unit (30) will initiate the transmission lines passing through the donor unit. A detonator unit (50) is provided for the initiation of explosives such as boosters and primers and comprises a shell for receiving explosives and a receptacle at one end suitable for receiving a donor mini-cap (24) at the other end. Relay units (30) allow for the simultaneous initiation of several donor units. Each donor unit can be attached to either additional relay units or to detonator units (50).