US3792619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant tension ball screw feed design
Assignee: Individual
•
Filing: 1972-08-31
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Granted: 1974-02-19
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Expires: 1992-08-31
Abstract
Abstract The invention herein is directed to a constant tension arrangement for a lead or ball screw drive for the purpose of preventing compressive forces from acting on an elongated ball screw or lead screw member to deform the same. The constant tension arrangement is provided by means of a bearing mounting in which thrust bearings are positioned on the ends of the screw member in such a manner that axial displacement in the direction of the support for the screw member is permitted. With this arrangement, and for either direction of motion of the driven nut thereon, any loading will effect a constant tension force on the ball or lead screw member opposite that of the loading permitting the remainder of the screw member to move axially and prevent compressive loading of the same.
Inventors
- 👤 R Cannon
- 👤 W Pehoski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:04
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/081; F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/24; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/1868
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
112 words
A screw drive for a member comprising, an elongated screw member, a support for mounting each end of said screw member, a splined end on one end of said screw member with motor means connected to the splined end for rotating said screw member, a nut mounted on the screw member and mounting the load member to be advanced in either direction along the extent of the screw member with rotation of the screw member by said motor means, and bearing means mounting said screw member on said support, said bearing means including thrust bearing journaling said screw member for rotative movement and means permitting limited axial movement of said screw member.
Claim 2
Dependent Claim
112 words
A screw drive for a member comprising, an elongated screw member, a support for mounting each end of said screw member, a splined end on one end of said screw member with motor means connected to the splined end for rotating said screw member, a nut mounted on the screw member and mounting the load member to be advanced in either direction along the extent of the screw member with rotation of the screw member by said motor means, and bearing means mounting said screw member on said support, said bearing means including thrust bearing journaling said screw member for rotative movement and means permitting limited axial movement of said screw member.
Claim 3
Dependent Claim
43 words
The screw drive of claim 1 in which the thrust bearing means is fixedly secured to the shaft in such a manner as to permit the end of the shaft to which the bearing means is attached to move axially beyond the same.
Claim 4
Dependent Claim
23 words
The screw drive of claim 1 in which the means included with the thrust bearings are sleeve bearings which permit the axial movement.
Claim 5
Dependent Claim
62 words
The screw drive of claim 1 in which the thrust bearing on at least one end of the screw member is an annular roller bearing with a fixed race attached to the support and secured remote from the end of the screw member and with a movable race attached to the shaft in a position nearest the end of the screw member.
Claim 6
Dependent Claim
31 words
The screw drive of claim 4 and including a sleeve bearing means additionally mounted on the screw member and permitting limited axial movement of said movable race of the thrust bearing.
Claim 7
Dependent Claim
48 words
The screw drive of claim 4 in which the movable race is mounted in a sliding bearing retainer fixed on said screw member with radial bearing means positioned between the sliding bearing retainer and the support for limited axial movement of the screw member relative to the support.
Claim 8
Dependent Claim
44 words
The screw drive of claim 6 in which the movable race of the thrust bearing is secured to the screw member by means of a threaded clamp nut bearing against the sliding bearing retainer and threaded on a threaded extremity of the screw member.
Claim 9
Dependent Claim
49 words
The screw drive of claim 1 in which the means permitting axial movement of the screw member is the splined connection at the other end of said screw member coupling the same to the motor means including the thrust bearings for mounting said other end of said screw member.
Claim 10
Dependent Claim
59 words
The screw drive of claim 8 and including a thrust transfer collar connected to the motor and engaging a flange on the extremity of the screw member with the splined connections between the screw member and the motor being positioned within the same and allowing for limited axial Movement of the screw member in the direction of the motor.
Claim 11
Dependent Claim
116 words
A screw drive for a member comprising, an elongated screw member, a support for mounting each end of said screw member, a nut mounted on the screw member and mounting a load member to be advanced in either direction along the extent of the screw member with relative rotation between the screw member and the nut, bearing means mounting said screw member in said support, said bearing means including thrust bearings journaling the screw member for rotative movement and means permitting limited axial movement of the screw member, and means providing a relative movement between the screw member and the nut to advance the load member in either direction along the extent of the screw member.
Claim 12
Dependent Claim
116 words
A screw drive for a member comprising, an elongated screw member, a support for mounting each end of said screw member, a nut mounted on the screw member and mounting a load member to be advanced in either direction along the extent of the screw member with relative rotation between the screw member and the nut, bearing means mounting said screw member in said support, said bearing means including thrust bearings journaling the screw member for rotative movement and means permitting limited axial movement of the screw member, and means providing a relative movement between the screw member and the nut to advance the load member in either direction along the extent of the screw member.
Claim 13
Dependent Claim
127 words
A screw drive for a member comprising, an elongated screw member, a support for mounting each end of said screw member, a nut mounted on the screw member and mounting a load member to be advanced in either direction along the extent of the screw member with relative rotation between the screw member and the nut, bearing means mounting said screw member in said support, said bearing means being fixedly secured to the shaft in such a manner as to permit the end of the shafts to which the bearing means is attached to move axially beyond the same, and means providing a relative movement between the screw member and the nut to advance the load member in either direction along the extent of the screw member.
Claim 14
Dependent Claim
127 words
A screw drive for a member comprising, an elongated screw member, a support for mounting each end of said screw member, a nut mounted on the screw member and mounting a load member to be advanced in either direction along the extent of the screw member with relative rotation between the screw member and the nut, bearing means mounting said screw member in said support, said bearing means being fixedly secured to the shaft in such a manner as to permit the end of the shafts to which the bearing means is attached to move axially beyond the same, and means providing a relative movement between the screw member and the nut to advance the load member in either direction along the extent of the screw member.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |