Patent US3589588A successfully refreshed from Google Patents.
US3589588A
Expired / Lapsed
US
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Impact tool
Assignee: Individual
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Filing: 1969-07-14
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Granted: 1971-06-29
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Expires: 1989-07-14
Abstract
Abstract A hand-held impact tool usable, for example, as a nailing machine is disclosed. The tool includes a hammer which is retracted by means of an electric motor to compress a spring. A gear, driven by the motor, is caused to disengage from the hammer upon retraction thereof to permit forward movement of the hammer under the pressure of the compressed spring. Switch means are provided to prevent a repeat of the operating cycle except upon manual release and depression of a trigger. A fastener-feeding structure is detachably secured to the impact tool. Provision is made for changing the hammer and fastener-feeder magazine to permit use of different size and shape fasteners such as nails and staples.
Inventors
- 👤 George O Vasku
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:50
CPC Classifications
B; B25; B25C; B25C1/00; B25C1/001; B25C1/005; B25C1/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
An impact tool comprising a hammer reciprocably mounted to deliver an operating blow, an electric motor, a drive train between the motor and the hammer to move the hammer in a predetermined hammer movement in one direction upon energization of the motor, said drive train being disconnected from said hammer upon completion of the movement of said hammer in said one direction, spring means compressed by the hammEr upon movement in said one direction and effective to drive said hammer in the other direction to deliver an operating blow when said drive train is disconnected from said hammer, and switch means interposed between said hammer and said motor and responsive to the movement of said hammer in said other direction to deenergize the motor.
Claim 2
Dependent Claim
124 words
An impact tool comprising a hammer reciprocably mounted to deliver an operating blow, an electric motor, a drive train between the motor and the hammer to move the hammer in a predetermined hammer movement in one direction upon energization of the motor, said drive train being disconnected from said hammer upon completion of the movement of said hammer in said one direction, spring means compressed by the hammEr upon movement in said one direction and effective to drive said hammer in the other direction to deliver an operating blow when said drive train is disconnected from said hammer, and switch means interposed between said hammer and said motor and responsive to the movement of said hammer in said other direction to deenergize the motor.
Claim 3
Dependent Claim
93 words
An impact tool as defined in claim 1, and further characterized in that said drive train includes a gear having teeth for only a portion of the periphery thereof, a gear rack connected to said hammer and having teeth engageable with the teeth of said gear, said gear being driven by said electric motor when the motor is energized to engage the gear rack and move the hammer in said one direction, the teeth of said gear disengaging the gear rack at the end of said predetermined hammer movement in said one direction.
Claim 4
Dependent Claim
43 words
An impact tool as defined in claim 2, and further characterized in that said gear has two sets of diametrically opposed teeth on the periphery thereof, a space being provided on said gear between the beginning and end of each set of teeth.
Claim 5
Dependent Claim
67 words
An impact tool as defined in claim 2, and further characterized in that said switch means comprises a limit switch placed in the path of said rack, the limit switch having a plunger engageable with said rack near the end of said predetermined hammer movement and to be actuated to operate said limit switch and deenergize the motor when said hammer is moved in said other direction.
Claim 6
Dependent Claim
148 words
An impact tool as defined in claim 4, and further characterized in that said limit switch has a pair of sets of contacts, one set of said contacts being closed by actuation of said plunger and the other set of said contacts being opened thereby, a manually actuable switch having a pair of sets of contacts and means to manually open one set of said contacts and close the other set of said contacts, one of each of said sets of contacts of each of said switches being in series with one set of contacts of the other switch and in parallel with the other set of contacts of said other switch, and in series with said electric motor whereby said electric motor is energized by closure of two sets of said contacts which are in series and deenergized by opening the closed contacts of the limit switch.
Claim 7
Dependent Claim
65 words
An impact tool as defined in claim 2, and further characterized in the provision of a casing having a portion with a longitudinal bore therethrough, said hammer, rack and spring being positioned in said bore, said casing including a portion enclosing the motor and gear train, opening means between said casing portions for ingress of the teeth of said gear for engagement with the rack.
Claim 8
Dependent Claim
58 words
An impact tool as defined in claim 2 wherein a fastener feeder structure is detachably connected thereto, said fastener feeder structure including means to feed a fastener into the path of movement of said hammer upon movement thereof in said one direction and for driving contact with said hammer when the latter is moved in said other direction.
Claim 9
Dependent Claim
38 words
An impact tool as defined in claim 7, and further characterized in the provision of a casing enclosing said hammer and associated structure, said fastener-feeding structure including a casing, and detachable fastening means securing the two casings together.
Claim 10
Dependent Claim
78 words
An impact tool as defined in claim 8, and further characterized in that said fastener casing includes an elongated storage chamber positioned at substantially right angles to the path of movement of said hammer, a slot in said fastener casing in alignment with the hammer to receive the hammer upon movement thereof towards the slot to drive a fastener out of the fastener structure, and spring-urged means to move fasteners contained within the storage chamber into the slot.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |