US3770065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skid supported cutting blade
Assignee: Dresser Industries Inc
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Filing: 1971-08-11
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Granted: 1973-11-06
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Expires: 1991-08-11
Abstract
Abstract A surface finishing vehicle having a skid supported cutting blade, the height of which is automatically controlled by a position sensing apparatus disposed in engagement with a reference string preset at a predetermined grade; the skid being connected to the cutting blade through a parallel linkage assembly and a double-acting cylinder which latter is in circuit with the position sensing apparatus whereby extension and retraction of said cylinder is effected responsive to the movement of said apparatus along said reference string.
Inventors
- 👤 R Gill
- 👤 Mahon F Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:57
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/80; E02F3/815; E02F3/8157; E02F3/84; E02F3/841
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
208 words
A device for automatically controlling the depth penetration of a cutting tool in accordance with a reference string comprising: support means for said cutting tool adapted for slideable travel over ground, said support means comprising a ground engaging skid having a shoe and an upstanding portion; linkage means connecting the upstanding portion with said cutting tool; elevator means interconnecting said support means and said cutting tool for vertical adjustment of the latter relative to the former; position sensing means having a housing attached to said cutting tool, said position sensing means including a rockably mounted feeler member engagable with said reference string and disposed exteriorLy of said housing; sensor means within said housing, said sensor means including light projecting means and a light responsive switch; means operatively connecting said light responsive switch and said elevator means for actuating said elevator means upon closing of said light responsive switch; sensor control means comprising an arm disposed within said housing; said arm being normally presented between said light projecting means and said light responsive switch for maintaining the latter in a circuit-opened condition; means coupling said arm to said feeler member for effecting simultaneous movement therewith to close said light responsive switch responsive to the movement of said feeler member.
Claim 2
Independent Claim
208 words
A device for automatically controlling the depth penetration of a cutting tool in accordance with a reference string comprising: support means for said cutting tool adapted for slideable travel over ground, said support means comprising a ground engaging skid having a shoe and an upstanding portion; linkage means connecting the upstanding portion with said cutting tool; elevator means interconnecting said support means and said cutting tool for vertical adjustment of the latter relative to the former; position sensing means having a housing attached to said cutting tool, said position sensing means including a rockably mounted feeler member engagable with said reference string and disposed exteriorLy of said housing; sensor means within said housing, said sensor means including light projecting means and a light responsive switch; means operatively connecting said light responsive switch and said elevator means for actuating said elevator means upon closing of said light responsive switch; sensor control means comprising an arm disposed within said housing; said arm being normally presented between said light projecting means and said light responsive switch for maintaining the latter in a circuit-opened condition; means coupling said arm to said feeler member for effecting simultaneous movement therewith to close said light responsive switch responsive to the movement of said feeler member.
Claim 3
Dependent Claim
96 words
The invention as defined in claim 1 and further characterized by: a second light responsive switch provided within said housing and located adjacent said first light responsive means; second means operatively connecting said second light responsive switch and said elevator means for actuating said elevator means upon closing of said second light responsive switch; said first light responsive switch being closed by said arm when said feeler member is swung upwardly by said reference string, and second light responsive switch being closed by said arm when said feeler member is swung downwardly by said reference string.
Claim 4
Dependent Claim
63 words
The invention as defined in claim 2 and further characterized by: said arm having a rearward end portion having outwardly flared margins, said rearward end portion being normally positioned in overlying relationship with said first and second light responsive switches; said rearward end portion having a width in its narrowest portion greater than the distance between the centers of said light responsive switches.
Claim 5
Dependent Claim
29 words
The invention as defined in claim 3 and further characterized by: adjustment means on said arm for moving same longitudinally within said housing relative to said light responsive switches.
Claim 6
Dependent Claim
31 words
The invention as defined in claim 3 and further characterized by: balance means mounted on said feeler member maintaining said arm in substantially planar normal relationship to said light responsive switches.
Claim 7
Dependent Claim
224 words
A surface finishing vehicle of the type used for moving earth in accordance with a reference string preset at a predetermined grade comprising: a mobile frame adapted for travel substantially parallel to said reference string; a cutting blade; at least one ground engaging member supporting said cutting blade independently of said frame; means freely connecting the cutting blade and said frame for permitting raising and lowering of said cutting blade independently of said frame; elevator means interconnecting said ground engaging member and said cutting blade for effecting raising and lowering of same relative to the ground engaging member; position sensing means having a housing supported on said blade and extending laterally outwardly thereof; said position sensing means including a rockably mounted feeler arm disposed exteriorly of said housing and engageable with said reference string for travel therealong; sensor means including light projecting means and at least one light responsive switch within said housing; means operatively connecting said light responsive switch and said elevator means; sensor control means comprising an arm disposed within said housing; said arm being normally presented between said light projecting means and said light responsive switch for maintaining the latter in a circuit-opened condition; means coupling said arm to said feeler arm for effecting simultaneous movement therewith to close said light responsive switch responsive to the movement of said feeler arm.
Claim 8
Dependent Claim
224 words
A surface finishing vehicle of the type used for moving earth in accordance with a reference string preset at a predetermined grade comprising: a mobile frame adapted for travel substantially parallel to said reference string; a cutting blade; at least one ground engaging member supporting said cutting blade independently of said frame; means freely connecting the cutting blade and said frame for permitting raising and lowering of said cutting blade independently of said frame; elevator means interconnecting said ground engaging member and said cutting blade for effecting raising and lowering of same relative to the ground engaging member; position sensing means having a housing supported on said blade and extending laterally outwardly thereof; said position sensing means including a rockably mounted feeler arm disposed exteriorly of said housing and engageable with said reference string for travel therealong; sensor means including light projecting means and at least one light responsive switch within said housing; means operatively connecting said light responsive switch and said elevator means; sensor control means comprising an arm disposed within said housing; said arm being normally presented between said light projecting means and said light responsive switch for maintaining the latter in a circuit-opened condition; means coupling said arm to said feeler arm for effecting simultaneous movement therewith to close said light responsive switch responsive to the movement of said feeler arm.
Claim 9
Dependent Claim
72 words
A surface finishing vehicle as defined in claim 6 and further characterized by a second ground engaging member supporting said cutting blade, said ground engaging members being disposed transversely at the sides of said mobiLe frame; said cutting blade extending between said ground engaging members and adjustably supported thereon independently of said frame; second elevator means connecting said second ground engaging member to said cutting blade for selectedly raising and lowering same.
Claim 10
Dependent Claim
85 words
A surface finishing vehicle as defined in claim 6 and further characterized by: a second light responsive switch provided within said housing and located adjacent said first light responsive means; second means operatively connecting said second light responsive switch and said elevator means; said first light responsive switch being closed by said arm when said feeler arm is swung upwardly by said reference string, and second light responsive switch being closed by said arm when said feeler arm is swung downwardly by said reference string.
Claim 11
Dependent Claim
65 words
A surface finishing vehicle as defined in claim 8 and further characterized by: said arm having a rearward end portion having outwardly flared margins, said rearward end portion being normally positioned in overlying relationship with said first and second light responsive switches; said rearward end portion having a width in its narrowest portion greater than the distance between the centers of said light responsive switches.
Claim 12
Dependent Claim
31 words
A surface finishing vehicle as defined in claim 9 and further characterized by: adjustment means on said arm for moving same longitudinally within said housing relative to said light responsive switches.
Claim 13
Dependent Claim
33 words
A surface finishing vehicle as defined in claim 9 and further characterized by: balance means mounted on said feeler arm maintaining said arm in substantially planar normal relationship to said light responsive switches.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |