US3838247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding helmet
Assignee: Sioux Steam Cleaner Corp
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Filing: 1974-03-25
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Granted: 1974-09-24
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Expires: 1994-03-25
Abstract
Abstract A light reducing viewing shield, or dark glass, mounted in the hood of a welding helmet for movements toward and away from an operative position in register with a viewing opening in the hood. Mechanism in the hood is operative to move the shield between its operative and inoperative positions responsive to movement of a welding electrode respectively into and out of welding engagement with a workpiece. Control circuitry including a time-delay mechanism insures against the movement of the shield away from its operative position until the welding arc is extinguished; and further insures that the welding arc is extinguished by shutting off the welding current when the hood of the helmet is pivotally moved, relative to the head-engaging harness, away from a position in front of the operator''s eyes.
Inventors
- 👤 J Finger
- 👤 W Jackson
- 👤 M Pochop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:51
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/04; A61F9/06; A61F9/061
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
287 words
A welding helmet, adapted to be connected in an electric welding circuit including a source of electric power, a workpiece connected to the source by a common line, and an electrode, comprising: a. a harness adapted to fit the head of a wearer; b. a hood rotatably mounted on the harness for movements between an operative position in front of the wearer''s face and a raised position above the wearer''s head, said hood defining an opening for viewing the workpiece; c. a light reducing eye protecting viewing shield in said hood; d. means mounting said shield for movements between an operative position covering said opening and an inoperative retracted position out of register with said opening; e. yielding means urging said shield in a direction of said movement toward said operative position; f. drive means for moving said shield in the opposite direction toward its retracted position against bias of said yielding means and including, a motor having a rotary shaft, a drive portion on said shaft, a cooperating driven element, mounting means mounting said driven element for movements toward and away from driving engagement with said drive portion and for movements in opposite directions angularly with respect to said first mentioned movements, and a connector element between said driven element and said shield; f. and control means for said drive means including, mechanism for moving said driven element away from engagement with said drive portion, and said electrode, for causing said shield to be moved to said operative position by said spring responsive to engagement of a workpiece by said electrode, and for causing said motor to move the shield out of register with said opening responsive to operative disengagement of the electrode from the workpiece.
Claim 2
Dependent Claim
287 words
A welding helmet, adapted to be connected in an electric welding circuit including a source of electric power, a workpiece connected to the source by a common line, and an electrode, comprising: a. a harness adapted to fit the head of a wearer; b. a hood rotatably mounted on the harness for movements between an operative position in front of the wearer''s face and a raised position above the wearer''s head, said hood defining an opening for viewing the workpiece; c. a light reducing eye protecting viewing shield in said hood; d. means mounting said shield for movements between an operative position covering said opening and an inoperative retracted position out of register with said opening; e. yielding means urging said shield in a direction of said movement toward said operative position; f. drive means for moving said shield in the opposite direction toward its retracted position against bias of said yielding means and including, a motor having a rotary shaft, a drive portion on said shaft, a cooperating driven element, mounting means mounting said driven element for movements toward and away from driving engagement with said drive portion and for movements in opposite directions angularly with respect to said first mentioned movements, and a connector element between said driven element and said shield; f. and control means for said drive means including, mechanism for moving said driven element away from engagement with said drive portion, and said electrode, for causing said shield to be moved to said operative position by said spring responsive to engagement of a workpiece by said electrode, and for causing said motor to move the shield out of register with said opening responsive to operative disengagement of the electrode from the workpiece.
Claim 3
Dependent Claim
43 words
The welding helmet defined in claim 1 in which said drive portion comprises a screw thread on said shaft, said driven element comprising a half-nut, said mounting means including a shiftable guide member supporting said half-nut for movements longitudinally of said motor shaft.
Claim 4
Dependent Claim
46 words
The welding helmet defined in claim 2 in which said shiftable guide member is pivotally mounted at one end in said hood for swinging movements toward and away from said motor shaft to move the half-nut into and out of threaded engagement with said screw thread.
Claim 5
Dependent Claim
73 words
The welding helmet defined in claim 3, characterized by yielding means urging said guide member in a direction of swinging movement thereof to move said half-nut into engagement with the screw thread, said guide member having a portion providing an armature, said mechanism for moving the driven member away from engagement with the drive portion including said armature and a cooperating solenoid disposed, when energized, to move said half-nut from the drive portion.
Claim 6
Dependent Claim
35 words
The welding helmet defined in claim 2 in which said control means includes electrical circuitry involving a limit switch for de-energizing said motor responsive to predetermined movement of said shield toward said retracted position thereof.
Claim 7
Dependent Claim
92 words
The welding helmet defined in claim 1 in which said mechanism for moving the driven element away from the drive portion includes a solenoid; said control means further including electrical circuitry comprising said solenoid; a time delay relay, the coil of which includes a portion of a power lead, connected to the electrode; a main relay including a switch interposed in said power lead; and a solenoid control relay operative to cause energization of said solenoid to move the driven element out of engagement with said drive portion of the motor shaft.
Claim 8
Dependent Claim
44 words
The welding helmet defined in claim 6 in which said control means includes a main relay control switch engaged by said shield in its operative position and operated by said shield to energize said main relay to close a welding circuit to a workpiece.
Claim 9
Dependent Claim
64 words
The welding helmet defined in claim 7 in further combination with a safety switch mounted for operation by movement of said hood relative to the harness and connected in series with said relay controlled switch, said safety switch being operative responsive to movement of the hood toward its raised position to de-energize said main relay, whereby to shut off welding current to the electrode.
Claim 10
Dependent Claim
53 words
The welding helmet defined in claim 6 in which said time delay relay includes a switch in series connection with said motor and operative only after a predetermined time interval subsequent to removal of a welding electrode from a workpiece to cause energization of said motor to retract the shield from said opening.
Claim 11
Dependent Claim
95 words
The welding helmet defined in claim 1 in which said shield comprises a viewing pane and a mounting frame therefor; said hood opening being generally rectangular in outline and being defined by a frame having a top, opposite ends, an open bottom portion, and a support element at one side of said open bottom portion, and in further combination with a clear transparent window pane inserted into said frame through said open bottom portion and resting on said support element, and retainer means yieldably holding said window pane on said support element within said frame.
Claim 12
Dependent Claim
81 words
The welding helmet defined in claim 10 in which said retainer means comprises a pair of resilient arms having upper ends secured in the top of saId frame and each disposed to engage a surface of the window pane adjacent a different one of the frame ends, said resilient arms having lower ends connected by a cross portion adjacent the bottom of the frame and positioned to be of easy access for moving the arms in a window pane releasing direction.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |