US3774479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic marking device
Assignee: Chicago Pneumatic Tool Co LLC
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Filing: 1971-12-14
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Granted: 1973-11-27
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Expires: 1991-12-14
Abstract
Abstract A tool pneumatically operable under the control of an operator to prick a piece of work, such as a bolt head or stud, in rapid succession with a group of marks to indicate a torqued condition of the work. The tool has a socket to be placed over the work; and has an operator controlled throttle for applying operating air to mechanism for marking the work.
Inventors
- 👤 R Lesner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:48
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/14; B25B23/145; B25B23/15
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
226 words
A pneumatic marking device for marking a piece of work, comprising a housing, a plunger within the housing carrying a marking rod for marking the work, a socket mounted to an end of the housing for receiving and centering the work for engagement by the marking rod, a return spring acting on the plunger normally biasing the plunger with the marking rod away from the work, the plunger being pneumatically operable against the bias of the spring to carry the marking rod into contact with the work, a piston pneumatically reciprocable within the plunger to pound the marking rod, and air control valve means having passage connections with both the plunger and the piston for feeding operating air concurrently to both the plunger and the piston, wherein the marking rod has a loss-motion connection with the plunger permitting limited axial and turning movement of the marking rod relative to the plunger; the loss-motion connection is in close proximity to an upper end of the marking rod and the major length of the marking rod projects beyond the point of the connection so as to allow side-to-side swinging of the marking rod; and a tube depends from the plunger in surrounding relation to and with some clearance relative to the marking rod, the tube providing a curb to the extent of side-to-side swinging of the marking rod.
Claim 2
Dependent Claim
226 words
A pneumatic marking device for marking a piece of work, comprising a housing, a plunger within the housing carrying a marking rod for marking the work, a socket mounted to an end of the housing for receiving and centering the work for engagement by the marking rod, a return spring acting on the plunger normally biasing the plunger with the marking rod away from the work, the plunger being pneumatically operable against the bias of the spring to carry the marking rod into contact with the work, a piston pneumatically reciprocable within the plunger to pound the marking rod, and air control valve means having passage connections with both the plunger and the piston for feeding operating air concurrently to both the plunger and the piston, wherein the marking rod has a loss-motion connection with the plunger permitting limited axial and turning movement of the marking rod relative to the plunger; the loss-motion connection is in close proximity to an upper end of the marking rod and the major length of the marking rod projects beyond the point of the connection so as to allow side-to-side swinging of the marking rod; and a tube depends from the plunger in surrounding relation to and with some clearance relative to the marking rod, the tube providing a curb to the extent of side-to-side swinging of the marking rod.
Claim 3
Dependent Claim
69 words
A pneumatic marking device as in claim 1, wherein the tip of the marking rod normally depends from the bottom of the tube in such manner that when the plunger carries the marking rod into contact with the work the marking rod is caused to take up some of the loss-motion and retract axially into the tube until its tip oBtains the level of the bottom of the tube.
Claim 4
Dependent Claim
205 words
A pneumatic marking device for marking a piece of work, comprising a housing, a plunger within the housing carrying a marking rod for marking the work, a return spring acting on the plunger normally biasing the plunger with the marking rod away from the work, the plunger being pneumatically operable against the bias of the spring to carry the marking rod into contact with the work, a piston pneumatically reciprocable within the plunger to pound the marking rod, and live air inlet means having passage connections with both the plunger and the piston for conducting live air concurrently to both the plunger and the piston, wherein the marking rod has a loss-motion connection with the plunger permitting limited axial and turning movement of the marking rod relative to the plunger; the loss-motion connection is in close proximity to an upper end of the marking rod and the major length of the marking rod projects beyond the point of the connection so as to allow side-to-side swinging of the marking rod; and a tube depends from the plunger in surrounding relation to and with some clearance relative to the marking rod, the tube providing a curb to the extent of side-to-side swinging of the marking rod.
Claim 5
Dependent Claim
205 words
A pneumatic marking device for marking a piece of work, comprising a housing, a plunger within the housing carrying a marking rod for marking the work, a return spring acting on the plunger normally biasing the plunger with the marking rod away from the work, the plunger being pneumatically operable against the bias of the spring to carry the marking rod into contact with the work, a piston pneumatically reciprocable within the plunger to pound the marking rod, and live air inlet means having passage connections with both the plunger and the piston for conducting live air concurrently to both the plunger and the piston, wherein the marking rod has a loss-motion connection with the plunger permitting limited axial and turning movement of the marking rod relative to the plunger; the loss-motion connection is in close proximity to an upper end of the marking rod and the major length of the marking rod projects beyond the point of the connection so as to allow side-to-side swinging of the marking rod; and a tube depends from the plunger in surrounding relation to and with some clearance relative to the marking rod, the tube providing a curb to the extent of side-to-side swinging of the marking rod.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |