Patent US3788674A successfully refreshed from Google Patents.
US3788674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clamping mechanism for side shiftable backhoe
Assignee: Caterpillar Inc
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Filing: 1972-08-17
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Granted: 1974-01-29
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Expires: 1992-08-17
Abstract
Abstract There is disclosed a backhoe having a base frame that is mounted to be stationary with respect to a vehicle. A shiftable frame is slidably mounted on the base frame and supports a digging arm and bucket at an infinite number of positions transverse to the axis of the vehicle. A hydraulically actuated clamp is operative to clamp the shiftable frame at selected positions on the stationary frame. The clamp is constructed and arranged to utilize the weight of the shiftable carriage to aid in clamping action and to thereby reduce clamping effort.
Inventors
- 👤 R Casey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:48
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/38; E02F3/382; E02F3/386
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
128 words
In an excavating machine having a side shiftable frame slidably mounted on upper and lower vertically spaced parallel slide rails of a stationary frame and a pressurized fluid source, the improvement comprising: hydraulically operated locking means for locking said shiftable frame in any one of an infinite number of positions along the stationary frame; said locking means comprising a lever pivotally mounted on said slide frame adjacent to said lower slide rail; and, a hydraulic ram operatively connected to pivot said lever into engagement with a downwardly directed face of said lower slide rail to thereby clamp said shiftable frame into engagement with an upper surface of said upper slide and said downwardly directed surface of said lower rail so that said clamping forces are substantially vertically directed.
Claim 2
Dependent Claim
128 words
In an excavating machine having a side shiftable frame slidably mounted on upper and lower vertically spaced parallel slide rails of a stationary frame and a pressurized fluid source, the improvement comprising: hydraulically operated locking means for locking said shiftable frame in any one of an infinite number of positions along the stationary frame; said locking means comprising a lever pivotally mounted on said slide frame adjacent to said lower slide rail; and, a hydraulic ram operatively connected to pivot said lever into engagement with a downwardly directed face of said lower slide rail to thereby clamp said shiftable frame into engagement with an upper surface of said upper slide and said downwardly directed surface of said lower rail so that said clamping forces are substantially vertically directed.
Claim 3
Dependent Claim
12 words
The invention of claim 1 wherein said lever is substantially horizontally disposed.
Claim 4
Dependent Claim
34 words
The invention of claim 2 wherein said slide frame comprises a horizontally disposed shaft and said lever is journaled on said horizontally disposed shaft spaced from and extending parallel to said lower slide rail.
Claim 5
Dependent Claim
19 words
The invention of claim 3 wherein said shaft is disposeD below the lower surface of said lower slide rail.
Claim 6
Dependent Claim
16 words
The invention of claim 4 wherein said lever includes a semi-cylindrical bearing surface engaging said shaft.
Claim 7
Dependent Claim
18 words
The invention of claim 2 wherein said lever includes camming means engaging said surface of said lower rail.
Claim 8
Dependent Claim
26 words
The invention of claim 6 comprising a horizontally directed bearing face directed in opposition to said camming means and engaging a face of said lower rail.
Claim 9
Dependent Claim
26 words
The invention of claim 1 wherein said source comprises a selector valve and a flexible conduit operative to direct pressurized hydraulic fluid to operate said ram.
Claim 10
Dependent Claim
18 words
The invention of claim 8 wherein said conduit comprises an expandable portion to thereby function as an accumulator.
Claim 11
Dependent Claim
13 words
The invention of claim 9 wherein said valve means comprises a check valve.
Claim 12
Dependent Claim
127 words
The combination of an excavating machine having a side shiftable frame slidably mounted on upper and lower vertically spaced parallel slide rails of a stationary frame and a pressurized hydraulic fluid source, and locking means for locking said shiftable frame in any one of an infinite number of positions along the stationary frame comprising: a lever pivotally mounted on said slide frame adjacent to said lower slide rail; and, a hydraulic ram operatively connected to force one end of said lever into engagement with a downwardly directed face of said lower slide rail to thereby clamp said shiftable frame into engagement with an upper surface of said upper slide and said downwardly directed surface of said lower rail so that said clamping forces are substantially vertically directed.
Claim 13
Dependent Claim
127 words
The combination of an excavating machine having a side shiftable frame slidably mounted on upper and lower vertically spaced parallel slide rails of a stationary frame and a pressurized hydraulic fluid source, and locking means for locking said shiftable frame in any one of an infinite number of positions along the stationary frame comprising: a lever pivotally mounted on said slide frame adjacent to said lower slide rail; and, a hydraulic ram operatively connected to force one end of said lever into engagement with a downwardly directed face of said lower slide rail to thereby clamp said shiftable frame into engagement with an upper surface of said upper slide and said downwardly directed surface of said lower rail so that said clamping forces are substantially vertically directed.
Claim 14
Dependent Claim
12 words
The invention of claim 11 wherein said lever is substantially horizontally disposed.
Claim 15
Dependent Claim
34 words
The invention of claim 12 wherein said slide frame comrpises a horizontally disposed shaft and said lever is journaled on said horizontally disposed shaft spaced from and extending parallel to said lower slide rail.
Claim 16
Dependent Claim
19 words
The invention of claim 13 wherein said shaft is disposed below the lower surface of said lower slide rail.
Claim 17
Dependent Claim
16 words
The invention of claim 14 wherein said lever includes a semi-cylindrical bearing surface engaging said shaft.
Claim 18
Dependent Claim
18 words
The invention of claim 12 wherein said lever includes camming means engaging said surface of said lower rail.
Claim 19
Dependent Claim
26 words
The invention of claim 16 comprising a horizontally directed bearing face directed in opposition to said camming means and engaging a face of said lower rail.
Claim 20
Dependent Claim
25 words
The invention of claim 11 wherein said source comprises a selector valve and a flexible conduit operative to direct pressurized fluid to operate said ram.
Claim 21
Dependent Claim
18 words
The invention of claim 18 wherein said conduit comprises an expandable portion to thereby function as an accumulator.
Claim 22
Dependent Claim
13 words
The invention of claim 19 wherein said valve means comprises a check valve.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |