US4514890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tool assembly for removal and installation of freeze plugs
Assignee: Individual
•
Filing: 1981-11-20
•
Granted: 1985-05-07
•
Expires: 2001-11-20
Abstract
Abstract The tool assembly enables installation in and removal from a combustion engine block of freeze plugs. The puller component has a plug penetrating point which is forced through the plug to define an opening. Spreader segments associated with the point can be spread laterally into engagement with the edge of the opening. Means are provided for imposing a retraction force on the segments, which cooperate to pull the plug free. A fresh plug is inserted in the freeze plug opening by utilization of an installer head shaped to releasably hold the plug during insertion in the opening after which the head can be withdrawn. Special leverage and force application arrangements are associated with the puller and installer head.
Inventors
- 👤 Alvin E. Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:40
CPC Classifications
B; B25; B25B; B25B27/00; B25B27/0035; B25B27/0042; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53796; Y10T29/53848; Y10T29/53857; Y10T29/53861; Y10T29/53874; Y10T29/53896; Y10T29/53909; Y10T29/5393
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
219 words
A tool for pulling a freeze plug from an engine block comprising: a shaft member terminating at one end in a tapered point for piercing a plug and forming an opening therein, a frame supporting said shaft at a location on said shaft remote from said point, means for moving said shaft longitudinally relative to said frame responsive to rotation of said shaft, cooperating spreadable segments surrounding said shaft and associated with said point, resilent means biasing said segments inwardly toward said shaft in a retracted condition during piercing of the plug, said segments anchored at one end to said frame and free to move laterally outwardly relative to said shaft at the other end and having plug engaging shoulders adapted to engage the plug around the opening and resist withdrawal of the segments through the opening once the plug has been pierced, a resilient, longitudinally collapsible member encircling said shaft and segments and having a ring-like guide member at one end encircling and adjacent said point, cooperating camming means on said shaft and said segments operable to spread said segments away from said shaft in response to longitudinal movement of said shaft, and means for applying force to said frame thereby to displace same and cause the plug to be pulled from the opening by the engaged segments.
Claim 2
Dependent Claim
219 words
A tool for pulling a freeze plug from an engine block comprising: a shaft member terminating at one end in a tapered point for piercing a plug and forming an opening therein, a frame supporting said shaft at a location on said shaft remote from said point, means for moving said shaft longitudinally relative to said frame responsive to rotation of said shaft, cooperating spreadable segments surrounding said shaft and associated with said point, resilent means biasing said segments inwardly toward said shaft in a retracted condition during piercing of the plug, said segments anchored at one end to said frame and free to move laterally outwardly relative to said shaft at the other end and having plug engaging shoulders adapted to engage the plug around the opening and resist withdrawal of the segments through the opening once the plug has been pierced, a resilient, longitudinally collapsible member encircling said shaft and segments and having a ring-like guide member at one end encircling and adjacent said point, cooperating camming means on said shaft and said segments operable to spread said segments away from said shaft in response to longitudinal movement of said shaft, and means for applying force to said frame thereby to displace same and cause the plug to be pulled from the opening by the engaged segments.
Claim 3
Dependent Claim
190 words
An installer for installing a freeze plug in a freeze plug opening in an engine block comprising, head portion insertable in and for forcing said plug into said opening, said head portion having an internal cavity with an open end facing the direction opposite from the plug, said open end having an edge, means for releasably holding said plug to said head portion and permitting said head to be withdrawn from the plug end opening when the plug has been installed, force transmission means connected with said head, said force transmission means being angularly adjustable with respect to the head portion thereby to vary the direction of a line of force applied to the head through the force transmission means, said force transmission means including (a) a shaft extending endwise into said cavity through said open end, (b) means pivotally securing the shaft within said cavity, (c) resilient means urging said shaft toward one side of the cavity, and (d) means adjustable along said shaft for engaging said edge so as to vary the angle of the shaft in the cavity when the shaft is in its resiliently biased position.
Claim 4
Dependent Claim
190 words
An installer for installing a freeze plug in a freeze plug opening in an engine block comprising, head portion insertable in and for forcing said plug into said opening, said head portion having an internal cavity with an open end facing the direction opposite from the plug, said open end having an edge, means for releasably holding said plug to said head portion and permitting said head to be withdrawn from the plug end opening when the plug has been installed, force transmission means connected with said head, said force transmission means being angularly adjustable with respect to the head portion thereby to vary the direction of a line of force applied to the head through the force transmission means, said force transmission means including (a) a shaft extending endwise into said cavity through said open end, (b) means pivotally securing the shaft within said cavity, (c) resilient means urging said shaft toward one side of the cavity, and (d) means adjustable along said shaft for engaging said edge so as to vary the angle of the shaft in the cavity when the shaft is in its resiliently biased position.
Claim 5
Dependent Claim
207 words
A tool for pulling a freeze plug from an engine block comprising: a shaft member terminating at one end in a tapered point for piercing a plug and forming an opening therein, a frame supporting said shaft at a location on said shaft remote from said point, means for moving said shaft longitudinally relative to said frame responsive to rotation of said shaft, cooperating spreadable segments surrounding said shaft and associated with said point, resilent means biasing said segments inwardly towards said shaft in a retracted condition during piercing of the plug, said segments anchored at one end to said frame and free to move laterally outwardly relative to said shaft at the other end having plug engaging shoulders adapted to engage the plug around the opening and resist withdrawal of the segments through the opening when they have passed through the opening in the direction of piercing of the plug, cooperating camming means on said shaft and said segments operable to spread said segments away from said shaft in response to longitudinal movement of said shaft relative to said frame, and means for applying force to said frame thereby to displace same and cause the plug to be pulled from the opening by the engaged segments.
Claim 6
Dependent Claim
207 words
A tool for pulling a freeze plug from an engine block comprising: a shaft member terminating at one end in a tapered point for piercing a plug and forming an opening therein, a frame supporting said shaft at a location on said shaft remote from said point, means for moving said shaft longitudinally relative to said frame responsive to rotation of said shaft, cooperating spreadable segments surrounding said shaft and associated with said point, resilent means biasing said segments inwardly towards said shaft in a retracted condition during piercing of the plug, said segments anchored at one end to said frame and free to move laterally outwardly relative to said shaft at the other end having plug engaging shoulders adapted to engage the plug around the opening and resist withdrawal of the segments through the opening when they have passed through the opening in the direction of piercing of the plug, cooperating camming means on said shaft and said segments operable to spread said segments away from said shaft in response to longitudinal movement of said shaft relative to said frame, and means for applying force to said frame thereby to displace same and cause the plug to be pulled from the opening by the engaged segments.
Claim 7
Dependent Claim
39 words
A tool as in claim 3, said segments including outer surfaces adjacent said point which form a continuation of the tapered point surfaces when the segments are in the retracted condition, said shoulders being adjacent said last named surfaces.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |