US3733940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lathes
Assignee: Alfred Herbert Ltd
•
Filing: 1971-04-08
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Granted: 1973-05-22
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Expires: 1991-04-08
Abstract
Abstract A lathe is provided in the feed drive to its saddle with a yieldable joint which absorbs shock loads. The joint may be incorporated in a nut assembly which is displaceable along a leadscrew and is connected to the saddle. The nut assembly comprises a housing, a pair of separate nut portions in the housing and prestressed resilient devices holding in position a pair of abutments through which axial thrust is transmitted from the nut portions to the housings.
Inventors
- 👤 J Harman
- 👤 M Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:10
CPC Classifications
B; B23; B23Q; B23Q5/00; B23Q5/22; B23Q5/34; B23Q5/38; B23Q5/40; B23Q5/404; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/18728; Y10T82/00; Y10T82/25; Y10T82/2531; Y10T82/2549
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
240 words
A lathe comprising a frame, a power driven spindle mounted on the frame, tool support means movably mounted on the frame and drive means for moving said tool support means relative to the frame, said drive means including a rotatable lead screw and a nut assembly engaged with said lead screw and connected to the tool support means for imparting movement thereto axially of said lead screw and said nut assembly comprising a nut housing connected to the tool support means, a pair of internally threaded nut members mounted in the housing, coacting with the leadscrew at two axially spaced positions thereon and axially movable relative to the housing but non-rotatable relative thereto, a pair of movable abutments in the housing against which the nut members abut respectively and prestressed resilient means in the housing acting in opposite axial directions on said movable abutments to urge the latter against fixed abutments in the housing, whereby when an excessive load is applied to the housing, in the event of a collision between the tool support means or a tool carried thereby with any other part of the lathe or a workpiece carried by the work spindle during movement of said tool support means by said driVe means, one movable abutment is displaced out of engagement with its associated fixed abutment against the force applied thereto by said resilient means, thereby permitting axial movement of the nut members relative to the housing.
Claim 2
Dependent Claim
240 words
A lathe comprising a frame, a power driven spindle mounted on the frame, tool support means movably mounted on the frame and drive means for moving said tool support means relative to the frame, said drive means including a rotatable lead screw and a nut assembly engaged with said lead screw and connected to the tool support means for imparting movement thereto axially of said lead screw and said nut assembly comprising a nut housing connected to the tool support means, a pair of internally threaded nut members mounted in the housing, coacting with the leadscrew at two axially spaced positions thereon and axially movable relative to the housing but non-rotatable relative thereto, a pair of movable abutments in the housing against which the nut members abut respectively and prestressed resilient means in the housing acting in opposite axial directions on said movable abutments to urge the latter against fixed abutments in the housing, whereby when an excessive load is applied to the housing, in the event of a collision between the tool support means or a tool carried thereby with any other part of the lathe or a workpiece carried by the work spindle during movement of said tool support means by said driVe means, one movable abutment is displaced out of engagement with its associated fixed abutment against the force applied thereto by said resilient means, thereby permitting axial movement of the nut members relative to the housing.
Claim 3
Dependent Claim
34 words
A lathe as claimed in claim 1 in which said abutments are at opposite ends of the nut housing and said resilient means acts on said movable abutments to urge them towards one another.
Claim 4
Dependent Claim
24 words
A lathe as claimed in claim 2 in which the resilient means comprises two pairs of disc springs acting respectively against the movable abutments.
Claim 5
Dependent Claim
30 words
A lathe as claimed in claim 3 in which the disc springs are held in prestressed condition by a pair of clamping members fitted to opposite ends of the housing.
Claim 6
Dependent Claim
42 words
A lathe as claimed in claim 4 in which finely splined vernier devices are provided for holding the nut members in angular positions relative to the housing such that they are urged away from one another into engagement with said movable abutments.
Claim 7
Dependent Claim
52 words
A lathe as claimed in claim 1 in which the nut housing is formed in two separate parts defining a chamber at opposite ends of which said fixed abutments are provided, said movable abutments being in said chamber and being urged away from one another by common resilient means interposed between them.
Claim 8
Dependent Claim
29 words
A lathe as claimed in claim 6 in which said resilient means comprises a pair of dished disc springs engaged with one another and with the respective movable abutments.
Claim 9
Dependent Claim
24 words
A lathe as claimed in claim 6 in which said resilient means comprises a stack of dished disc springs engaged between said movable abutments.
Claim 10
Dependent Claim
17 words
A lathe as claimed in claim 7 which the disc springs are arranged in two nested groups.
Claim 11
Dependent Claim
51 words
A lathe as claimed in claim 6 in which the nut members have finely splined vernier adjustment devices whereby the nut members are so angularly positioned relative to the housing that this interaction with the lead-screw causes them to be urged towards one another into engagement with the respective movable abutments.
Claim 12
Dependent Claim
136 words
A shock absorbing device for use in conjunction with a leadscrew comprising a nut housing, a pair of internally threaded nut members mounted within the housing for coacting with the leadscrew at two axially spaced positions thereon said nut member being axially movable relative to the housing, but non-rotatable relative thereto, a pair of movable abutments in the housing against which the nut members abut respectively and prestressed resilient means in the housing acting in opposite axial directions on said movable abutments to urge the latter against fixed abutments in the housing, whereby when an excessive load is applied to the housing one movable abutment is displaced out of engagement with its associated fixed abutment against the force applied thereto by said resilient means, thereby permitting axial movement of the nut members relative to the housing.
Claim 13
Dependent Claim
136 words
A shock absorbing device for use in conjunction with a leadscrew comprising a nut housing, a pair of internally threaded nut members mounted within the housing for coacting with the leadscrew at two axially spaced positions thereon said nut member being axially movable relative to the housing, but non-rotatable relative thereto, a pair of movable abutments in the housing against which the nut members abut respectively and prestressed resilient means in the housing acting in opposite axial directions on said movable abutments to urge the latter against fixed abutments in the housing, whereby when an excessive load is applied to the housing one movable abutment is displaced out of engagement with its associated fixed abutment against the force applied thereto by said resilient means, thereby permitting axial movement of the nut members relative to the housing.
Claim 14
Dependent Claim
36 words
A shock absorbing device as claimed in claim 11 in which said abutments are at opposite ends of the nut housing and said resilient means acts on said movable abutments to urge them towards one another.
Claim 15
Dependent Claim
26 words
A shock absorbing device as claimed in claim 12 in which the resilient means comprises two pairs of disc springs acting respectively against the movable abutments.
Claim 16
Dependent Claim
32 words
A shock absorbing device as claimed in claim 13 in which the disc springs are held in prestressed condition by a pair of clamping members fitted to opposite ends of the housing.
Claim 17
Dependent Claim
44 words
A shock absorbing device as claimed in claim 14 in which finely splined vernier devices are provided for holding the nut members in angular positions relative to the housing such that they are urged away from one another into engagement with said movable abutments.
Claim 18
Dependent Claim
54 words
A shock absorbing device as claimed in claim 11 in which the nut housing is formed in two separate parts defining a chamber at opposite ends of which said fixed abutments are provided, said movable abutments being in said chamber and being urged away from one another by common resilIent means interposed between them.
Claim 19
Dependent Claim
31 words
A shock absorbing device as claimed in claim 16 in which said resilient means comprises a pair of dished disc springs engaged with one another and with the respective movable abutments.
Claim 20
Dependent Claim
26 words
A shock absorbing device as claimed in claim 16 in which said resilient means comprises a stack of dished disc springs engaged between said movable abutments.
Claim 21
Dependent Claim
20 words
A shock absorbing device as claimed in claim 17 in which the disc springs are arranged in two nested groups.
Claim 22
Dependent Claim
53 words
A shock absorbing device as claimed in claim 16 in which the nut members have finely splined vernier adjustment devices whereby the nut members are so angularly positioned relative to the housing that their interaction with the leadscrew causes them to be urged towards one another into engagement with the respective movable abutments.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |