Portable instrument for recording electrical load current and operating duration

Claim 2

Portable apparatus for recording electrical load current and operating duration, comprising: a. a portable housing adapted to accommodate elements of said apparatus, b. means operatively associated with said electrical load for producing separate load current and operating duration signals, c. means for recording said load current signal and including a record drive movable only under control of said operating duration signal, and d. a source within said housing for powering said recorder record driver.

Claim 3

The apparatus of claim 1 wherein means (b) is adapted to produce the operating duration signal in response to a predetermined magnitude of the load current signal.

Claim 4

The apparatus of claim 1 wherein means (b) includes a shunt for producing a DC load current signal.

Claim 5

The apparatus of claim 1 wherein means (b) includes means for producing the load current signals connected in series with a current relay for producing the operating duration signal.

Claim 6

The apparatus of claim 1 wherein source (d) is a battery in said housing.

Claim 7

The apparatus of claim 1 wherein source (d) is a battery, and further including: (e) means in said housing for charging said battery from an external source.

Claim 8

The apparatus of claim 1 wherein means (b) includes a current transformer for producing an AC load current signal and means responsive to the AC load current signal for producing the operating duration signal.

Claim 9

The apparatus of claim 7 wherein the means for producing the operating duration signal is a relay connected to the output of said current transformer.

Claim 10

The apparatus of claim 7 wherein the means for producing the operating duration signal is a signal level detector connected to the output of said current transformer.

Claim 11

The apparatus of claim 1 wherein means (b) includes a shunt for producing a DC load current signal and means responsive to the DC load current signal for producing the operating duration signal.

Claim 12

The apparatus of claim 4 wherein the means for producing the operating duration signal is a current relay.

Claim 13

The apparatus of claim 10 wherein the means for producing the operating duration signal is a current relay consisting essentially of a magnetic-flux producing coiled conductor surrounding a magnetic reed switch.

Claim 14

The apparatus of claim 10 wherein the means for producing the operating duration signal is a relay connected to the output of said shunt.

Claim 15

The apparatus of claim 10 wherein the means for producing the operating duration signal is a signal level detector connected to the output of said shunt.

Claim 16

Portable apparatus for recording electrical load current and operating duration, comprising: a. a portable housing adapted to accommodate elements of said apparatus, b. input and output circuit connectors adapted to be connected to a load current source and said load, respectively, c. means operatively associated with said input and output connectors for producing a load current signal, d. means operatively associated with means (c) for producing an operating duration signal, e. means for recording said load current signal and including a record drive movable only under control of said operating duration signal, and f. a source within said housing for powering said recorder record drive.

Claim 17

Portable apparatus for recording electrical load current and operating duration, comprising: a. a portable housing adapted to accommodate elements of said apparatus, b. input and output circuit connectors adapted to be connected to a load current source and said load, respectively, c. means operatively associated with said input and output connectors for producing a load current signal, d. means operatively associated with means (c) for producing an operating duration signal, e. means for recording said load current signal and including a record drive movable only under control of said operating duration signal, and f. a source within said housing for powering said recorder record drive.

Claim 18

The apparatus of claim 15 wherein source (f) is a battery.

Claim 19

The apparatus of claim 15 wherein source (f) is a battery, and further including: (g) means in said housing for charging said battery from an external source.

Claim 20

Portable apparatus for recording DC arc welding current and operating duration, comprising: a. a portable housing adapted to acommodate elements of said apparatus, b. input and output cable connectors adapted to be connected to a DC current source and a welding rod holder, respectively, c. a shunt for producing a DC arc current signal, d. a current relay connected in series with said shunt across said input and output connectors for producing an operating duration signal, e. a strip chart recorder for recording the DC arc current signal and including a chart drive movable only under control of said operating duration signal, and f. a battery within said housing for powering said chart drive.

Claim 21

Portable apparatus for recording DC arc welding current and operating duration, comprising: a. a portable housing adapted to acommodate elements of said apparatus, b. input and output cable connectors adapted to be connected to a DC current source and a welding rod holder, respectively, c. a shunt for producing a DC arc current signal, d. a current relay connected in series with said shunt across said input and output connectors for producing an operating duration signal, e. a strip chart recorder for recording the DC arc current signal and including a chart drive movable only under control of said operating duration signal, and f. a battery within said housing for powering said chart drive.

Claim 22

Portable apparatus for recording AC arc welding current and operating duration, comprising: a. a portable housing adapted to accommodate elements of said apparatus, b. input and output cable connectors adapted to be connected to an AC current source and a welding load, respectively, c. a current transformer for producing an AC load current signal, d. a current relay connected in series with said current transformer across said input and output connectors for producing an operating duration signal, e. a strip chart recorder for recording the AC load current signal and including a chart drive movable only under control of said operating duration signal, and f. a battery within said housing for powering said chart drive.

Claim 23

Portable apparatus for recording AC arc welding current and operating duration, comprising: a. a portable housing adapted to accommodate elements of said apparatus, b. input and output cable connectors adapted to be connected to an AC current source and a welding load, respectively, c. a current transformer for producing an AC load current signal, d. a current relay connected in series with said current transformer across said input and output connectors for producing an operating duration signal, e. a strip chart recorder for recording the AC load current signal and including a chart drive movable only under control of said operating duration signal, and f. a battery within said housing for powering said chart drive.

Claim 24

Portable apparatus for recording electrical load current, load voltage and operating duration, comprising: a. a portable housing adapted to accommodate elements of said apparatus, b. means operatively associated with said electrical load for producing separate load current, load voltage and operating duration signals, c. means for separately recording said load current and load voltage signals on a common record and including a record drive movable only under control of said operating duration signal, and d. a source within said housing for powering said recorder record drive.

Claim 25

Portable apparatus for recording electrical load current, load voltage and operating duration, comprising: a. a portable housing adapted to accommodate elements of said apparatus, b. means operatively associated with said electrical load for producing separate load current, load voltage and operating duration signals, c. means for separately recording said load current and load voltage signals on a common record and including a record drive movable only under control of said operating duration signal, and d. a source within said housing for powering said recorder record drive.