US3774700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thrust bearing for impact tool and other rock penetrating tools
Assignee: FIRST COLORADO BANK & TRUST NA
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Filing: 1971-03-08
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Granted: 1973-11-27
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Expires: 1991-03-08
Abstract
Abstract There are three principal areas within a main housing to be lubricated, each area involving some part of a power shaft which may be considered to be vertically oriented. The first of these areas (or volumes) is a thrust bearing at the upper end of the shaft, where it has an integral radially outjutting flange supported in a shoulder formed by the main housing. The second area is a radial bearing between the cylindrical surface of the shaft and a confronting bore in a reentrant sleeve portion of the housing which extends down into its interior. The shaft extends below the housing sleeve and terminates inside the main housing. An axially reciprocating subhousing is secured to the lower end of the shaft in sealing fashion, this subhousing being a combination cam-and-striker member with the cam surface lying inside the subhousing and engaging a pair of rollers or cam followers secured to the opposed ends of a short shaft extending transversely through the lower end of the power shaft and projecting at both ends to support the rollers. The third area is the space within the subhousing, which is filled with lubricant to protect the parts of the camming mechanism. To accomplish the needed lubrication, a main passageway extends from the outside of the main housing to a vent in the bore of the sleeve passageway, where a bearing spacer is provided between a pair of axially spaced radial bearings. This spacer, which is circumferentially floating, has a multiplicity of windows, and also has a groove in its outer surface which permits lubricant to feed the windows. This arrangement also enables lubricant to flow up and down to the two radial bearings. The windows are in flow communication with a short radial passageway in the main shaft which joins an offset axial passageway extending from its juncture with the radial passageway to the bottom of the shaft and thus into the space inside the subhousing member suspended from the lower end of the power shaft. The main passageway through the outer or main housing contains a check valve for injecting lubricant, and this main passageway has a branching passageway leading to the first area, containing the thrust bearing.
Inventors
- 👤 W Shepherd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:23
CPC Classifications
B; B25; B25D; B25D17/00; B25D17/26; Y; Y10; Y10S; Y10S173/00; Y10S173/03
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 words
In a motor driven, cam-and-spring operated impact tool which includes a housing, a shaft extending through a bore into the housing from a motor mounted atop such housing and a cam member surrounding the free end of the shaft and cooperating therewith by contact between a pair of cam followers mounted on a shaft projecting transversely at opposed diametral ends of the motor shaft and an annular camming surface on the cam, there being a subhousing within the main housing which includes said cam member enclosing said camming surface, transverse shaft and lower end of the motor shaft, the improvement comprising a lubrication system for said subhousing interior comprising an opening through the main housing wall for injecting lubricant and a passage extending axially through said shaft, said passage being connected at its upper end to the space contiguous with the inner end of said housing wall opening and terminating at its lower end in the space within said subhousing.
Claim 2
Dependent Claim
160 words
In a motor driven, cam-and-spring operated impact tool which includes a housing, a shaft extending through a bore into the housing from a motor mounted atop such housing and a cam member surrounding the free end of the shaft and cooperating therewith by contact between a pair of cam followers mounted on a shaft projecting transversely at opposed diametral ends of the motor shaft and an annular camming surface on the cam, there being a subhousing within the main housing which includes said cam member enclosing said camming surface, transverse shaft and lower end of the motor shaft, the improvement comprising a lubrication system for said subhousing interior comprising an opening through the main housing wall for injecting lubricant and a passage extending axially through said shaft, said passage being connected at its upper end to the space contiguous with the inner end of said housing wall opening and terminating at its lower end in the space within said subhousing.
Claim 3
Dependent Claim
104 words
The improved impact tool of claim 1 which the upper end of said axially extending passage in the shaft includes a portion extending radially to the lateral surface of the shaft and breaching the same at a vent, together with a sleeve-like bearing spacer or lubricant distributor member surrounding the shaft, said bearing spacer being disposed in an annular space between the outer surface of the shaft and the inner wall of said borE and having a multiplicity of circumferentially spaced radial windows therethrough, said windows approximately registering axially with said vent in the shaft and the inner end of said housing wall opening.
Claim 4
Dependent Claim
227 words
In a motor driven, cam-and-spring operated impact tool which includes a housing, a shaft extending into the housing from a motor mounted atop such housing, an outwardly radially projecting flange on said shaft adjacent the motor end of the housing and a cam member surrounding the free end of the shaft and cooperating therewith by contact between a pair of cam followers mounted on a shaft projecting transversely at opposed diametral ends of the motor shaft and an annular camming surface on the cam, there being an annular surface on the interior of the housing wall facing an annular surface on said flange to form a friction bearing therewith, and there being a subhousing within the main housing which includes said cam member enclosing said camming surface, transverse shaft and lower end of the motor shaft, the improvement comprising a lubrication system for said subhousing interior and said friction bearing comprising an opening through the main housing wall for injecting lubricant and a passage extending axially through said shaft, said passage being connected at its upper end to the space contiguous with the inner end of said housing wall opening and terminating at its lower end in the space within said subhousing, and a branch opening through said main housing wall terminating at one end in said opening and at the other end in said friction bearing.
Claim 5
Dependent Claim
227 words
In a motor driven, cam-and-spring operated impact tool which includes a housing, a shaft extending into the housing from a motor mounted atop such housing, an outwardly radially projecting flange on said shaft adjacent the motor end of the housing and a cam member surrounding the free end of the shaft and cooperating therewith by contact between a pair of cam followers mounted on a shaft projecting transversely at opposed diametral ends of the motor shaft and an annular camming surface on the cam, there being an annular surface on the interior of the housing wall facing an annular surface on said flange to form a friction bearing therewith, and there being a subhousing within the main housing which includes said cam member enclosing said camming surface, transverse shaft and lower end of the motor shaft, the improvement comprising a lubrication system for said subhousing interior and said friction bearing comprising an opening through the main housing wall for injecting lubricant and a passage extending axially through said shaft, said passage being connected at its upper end to the space contiguous with the inner end of said housing wall opening and terminating at its lower end in the space within said subhousing, and a branch opening through said main housing wall terminating at one end in said opening and at the other end in said friction bearing.
Claim 6
Dependent Claim
181 words
A bearing spacer-lubricant distributor for use in a motor driven, cam-and-spring operated impact tool, said impact tool including a main housing, a shaft extending from a motor through a bore into the main housing and into a subhousing within the main housing, said subhousing and shaft including cooperating cam and cam follower means enclosed by said subhousing; said bearing spacer-lubricant distributor to be located: a. loosely between the inner wall of said bore and the outer periphery of said shaft, b. between two bearing members to be located in said bore and around said shaft, and c. between a lubricant receiving opening formed through the main housing wall and a passageway extending into and axially through said shaft to said subhousing, said bearing spacer-lubricant distributor being in the form of a spool or sleeve having a wall indented from its outer surface to form an annular groove between its ends and a multiplicity of radial windows extending through said wall from said annular groove, said windows being located between the ends of the sleeve and being circumferentially spaced from one another.
Claim 7
Dependent Claim
181 words
A bearing spacer-lubricant distributor for use in a motor driven, cam-and-spring operated impact tool, said impact tool including a main housing, a shaft extending from a motor through a bore into the main housing and into a subhousing within the main housing, said subhousing and shaft including cooperating cam and cam follower means enclosed by said subhousing; said bearing spacer-lubricant distributor to be located: a. loosely between the inner wall of said bore and the outer periphery of said shaft, b. between two bearing members to be located in said bore and around said shaft, and c. between a lubricant receiving opening formed through the main housing wall and a passageway extending into and axially through said shaft to said subhousing, said bearing spacer-lubricant distributor being in the form of a spool or sleeve having a wall indented from its outer surface to form an annular groove between its ends and a multiplicity of radial windows extending through said wall from said annular groove, said windows being located between the ends of the sleeve and being circumferentially spaced from one another.
Claim 8
Dependent Claim
113 words
In a motor driven, cam-and-spring operated tool which includes a main housing, a shaft extending into the main housing from a motor, coupled to said main housing, and into a subhousing within the main housing, said subhousing and shaft including cooperating cam and cam follower means enclosed by said subhousing, the improvement comprising a lubrication system for said subhousing interior comprising an opening through the main housing wall for injecting lubricant and a passage extending axially through said shaft, said passage being connected at its upper end to the space contiguous with the inner end of said main housing wall opening and terminating at its lower end in the space within said subhousing.
Claim 9
Dependent Claim
113 words
In a motor driven, cam-and-spring operated tool which includes a main housing, a shaft extending into the main housing from a motor, coupled to said main housing, and into a subhousing within the main housing, said subhousing and shaft including cooperating cam and cam follower means enclosed by said subhousing, the improvement comprising a lubrication system for said subhousing interior comprising an opening through the main housing wall for injecting lubricant and a passage extending axially through said shaft, said passage being connected at its upper end to the space contiguous with the inner end of said main housing wall opening and terminating at its lower end in the space within said subhousing.
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) | 1976-11-26 | 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 |