John Daniel Grady

US Patent:

43631282, Dec 7, 1982

Filed:

Sep 29, 1980

Appl. No.:

6/191532

Inventors:

John K. Grady - Concord MA
Paul G. Rice - Lincoln MA

International Classification:

G03B 4116

US Classification:

378181

Abstract:

An X-ray apparatus has a moveable support on which are slidingly mounted an X-ray tube, an image intensifier and a film holder, these radiation components defining a common radiation axis. By including a reversible motor connected to a system of clutch operated drive linkages the X-ray tube and receptors can be selectively and reciprocally moved along the radiation axis in either an independent or interdependent manner so as to preserve a radiologically desirable Source to Image Distance (SID) while simultaneously accommodating other X-ray examination requirements such as patient comfort, safety, and desired examining position. The X-ray tube is attached to a lever arm and the image intensifier and film holder are each moved by respective cables travelling around respective drive pulleys and idler pulleys. Both the X-ray tube and receptors are closely counterbalanced by counterweights respectively moved by the cables. When the drive motor is appropriately engaged, a connecting shaft, belt or sprocket chain transmits the motor's force selectively through intermediate, force limited, slip clutches to the appropriate X-ray components.

US Patent:

43629709, Dec 7, 1982

Filed:

Sep 8, 1980

Appl. No.:

6/184991

Inventors:

John K. Grady - Concord MA

International Classification:

H05B 3702

US Classification:

315159

Abstract:

An energy conserving circuit for controlling supply of electrical power to various loads such as a street lamp or a hot water heater comprises a photoelectric device for starting a timer when a change from daylight to dark is sensed at sundown, and a load power control responsive to the timer to switch between power-off and power-on states. With a street lamp the timer and power control means are connected to switch the power control means to power-on state at the beginning of the delay period at sundown and later, well before sunrise, to switch to power-off state. In the case of a household hot water heater the switching of the power control to power-on state is delayed until the peak demand hours have ended after sundown. The photoelectric device will normally cause the power control to switch to power-off state at sunrise. But a second timer may be added which is responsive to the photoelectric device to start a second timing period ending after normal sunrise so that switching to power-off will occur if the photoelectric device does not or cannot respond to sunrise.

US Patent:

43226230, Mar 30, 1982

Filed:

May 5, 1980

Appl. No.:

6/146526

Inventors:

John K. Grady - West Concord MA

International Classification:

H05G 100

US Classification:

250402

Abstract:

A X-ray tube is mounted on the same mobile base as its power supply which includes a pair of motor driven flywheels. The motors can be run from 120 volt outlets to bring the flywheels to a predetermined speed. The motors are then shut off and the flywheels drive electric generators. A motor controlled variac maintains the power output of the generators constant as energy is drawn from the flywheels and they slow down. The power output is switched through a step-up transformer and a rectifier to the load of the X-ray tube. The two flywheels are equal and opposite in angular momentum by counterrotation and therefore cancel the effect precessional or other movement to the mobile base when energy is drawn from them.

US Patent:

43653430, Dec 21, 1982

Filed:

Nov 4, 1980

Appl. No.:

6/203963

Inventors:

John K. Grady - Lincoln MA
David B. Rice - Cambridge MA
Paul G. Rice - Lincoln MA

Assignee:

XRE Corporation - Concord MA

International Classification:

G03B 4116

US Classification:

378181

Abstract:

X-ray apparatus comprises a U-shaped support having two hollow, horizontal arms. On the end of one arm is mounted an X-ray tube and on the other an X-radiation receptor both guided for movement on a radiation axis. A counterweight within one hollow, horizontal arm is guided for movement parallel to the X-ray tube, transversely of the arm. To counterbalance the X-ray tube a lever attached to the tube has sliding pivots at a fulcrum and the counterweight allowing the lever arm to change its length without changing the leverage ratio.

US Patent:

41624203, Jul 24, 1979

Filed:

Jun 5, 1978

Appl. No.:

5/912185

Inventors:

John K. Grady - West Concord MA

International Classification:

H01J 3510

US Classification:

313 60

Abstract:

An X-ray tube including an envelope enclosing a flat-edged anode disc rotatable and axially reciprocable and further enclosing an electron beam source for projecting electrons along a beam axis toward the edge of the anode disc. The beam source is disposed to direct its beam at an acute angle of incidence to the edge of the anode disc and produce X-rays which are transmitted through a window in the envelope.

US Patent:

52037428, Apr 20, 1993

Filed:

Jan 14, 1992

Appl. No.:

7/820355

Inventors:

John H. Grady - Wayland MA

Assignee:

Phillips Screw Company - Burlington MA

International Classification:

B21K 146

US Classification:

470 63

Abstract:

A punch is provided for making a screw head with ribs on some of the driver surfaces. The punch includes a slanted groove for providing a rib which is slanted from the screw axis by a small angle between 1. degree. and 10. degree.

US Patent:

51201739, Jun 9, 1992

Filed:

Jul 26, 1991

Appl. No.:

7/736094

Inventors:

John H. Grady - Wayland MA

Assignee:

Phillips Screw Company - Burlington MA

International Classification:

F16B 2300
F16B 3506

US Classification:

411404

Abstract:

A screw head is provided with ribs on some of the driver engageable surfaces. The rib is slanted outwardly from the screw axis by a small angle between 1. degree. and 10. degree.