Patent US3557971A successfully refreshed from Google Patents.
US3557971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bar feed mechanism for lathe
Assignee: Individual
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Filing: 1969-04-15
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Granted: 1971-01-26
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Expires: 1989-04-15
Abstract
Abstract A novel construction of a bar-feed mechanism for lathe such as a turret lathe is composed of a main structure of the mechanism slidable on a guide means supported by a base structure, an operational tubular member slidably and freely rotatably included in said main structure, a lever means pivotably mounted on said main structure for driving said operational tubular member longitudinally and reciprocatingly in said main structure, a seizing means which seizes and releases the bar material in cooperation with the advance and retraction of said operational tubular member, a hydraulic cylinder provided traversingly between an end of the lever means and said main structure, and another hydraulic cylinder which shifts the main structure for a predetermined distance along the guide.
Inventors
- 👤 Hirofumi Tomiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:34
CPC Classifications
B; B23; B23B; B23B13/00; Y; Y10; Y10T; Y10T82/00; Y10T82/25; Y10T82/2514; Y10T82/2521
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
355 words
A bar-feed mechanism for a lathe comprising a base structure, guiding means supported on said base structure, a main structure slidably mounted relative to said guiding means for reciprocation thereon, a tubular member slidably and rotatably mounted relative to said main structure for reciprocation and rotation relative thereto, lever means having opposite end portions, pivot means pivotally mounting said lever means relative to said main structure intermediate said end portions, and engaging ring mounted on said tubular member for movement therewith, a feed seizing means including a plurality of seizing members, linkage means operatively interconnecting said seizing members with said tubular member for moving said seizing members into and out of seizing relationship with a bar material in response to reciprocating sliding movement of said tubular member relative to said main structure, a first hydraulic means operatively interposed between one of said end portions of said lever means and said main structure for pivoting said lever means about said pivot means relative to main structure, roller means carried by said other end portion of said lever means and engaged with said engaging ring for movement of said engaging ring and thereby said tubular member in response to pivotal movement of said lever means, a second hydraulic means operatively associated with said main structure for slidingly reciprocating said main structure relative to said guiding means, means for selectively actuating said first hydraulic means to move said seizing members into seizing relationship with a bar material, means for selectively actuating said second hydraulic means as the bar material is being seized to slidingly reciprocate said main structure relative to said guiding means in a first direction toward the lathe, means for selectively actuating said first hydraulic means to move said seizing members out of seizing relationship with the bar material after said main structure has been slidingly reciprocated relative to said building means in said first direction, and means to selectively actuate said second hydraulic means after the bar material has been released by said seizing members to slidingly reciprocate said main structure relative to said guiding means in a second direction opposite to said first direction.
Claim 2
Dependent Claim
355 words
A bar-feed mechanism for a lathe comprising a base structure, guiding means supported on said base structure, a main structure slidably mounted relative to said guiding means for reciprocation thereon, a tubular member slidably and rotatably mounted relative to said main structure for reciprocation and rotation relative thereto, lever means having opposite end portions, pivot means pivotally mounting said lever means relative to said main structure intermediate said end portions, and engaging ring mounted on said tubular member for movement therewith, a feed seizing means including a plurality of seizing members, linkage means operatively interconnecting said seizing members with said tubular member for moving said seizing members into and out of seizing relationship with a bar material in response to reciprocating sliding movement of said tubular member relative to said main structure, a first hydraulic means operatively interposed between one of said end portions of said lever means and said main structure for pivoting said lever means about said pivot means relative to main structure, roller means carried by said other end portion of said lever means and engaged with said engaging ring for movement of said engaging ring and thereby said tubular member in response to pivotal movement of said lever means, a second hydraulic means operatively associated with said main structure for slidingly reciprocating said main structure relative to said guiding means, means for selectively actuating said first hydraulic means to move said seizing members into seizing relationship with a bar material, means for selectively actuating said second hydraulic means as the bar material is being seized to slidingly reciprocate said main structure relative to said guiding means in a first direction toward the lathe, means for selectively actuating said first hydraulic means to move said seizing members out of seizing relationship with the bar material after said main structure has been slidingly reciprocated relative to said building means in said first direction, and means to selectively actuate said second hydraulic means after the bar material has been released by said seizing members to slidingly reciprocate said main structure relative to said guiding means in a second direction opposite to said first direction.
Claim 3
Dependent Claim
42 words
A bar-feed mechanism according to claim 1 further including stationary supplementary seizing members carried by said seizing means and functioning to assist in supporting the bar material as it is fed by said mechanism and suppressing any vibration in the bar material.
Claim 4
Dependent Claim
44 words
A bar-feed mechanism according to claim 1 wherein said means for selectively actuating said first hydraulic means to move said seizing member out of seizing relationship with the bar material is responsive to seizing of the bar material by a chuck in the lathe.
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |