US3924753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crane counterweight support and means for removing and mounting same
Assignee: Case LLC
•
Filing: 1974-04-22
•
Granted: 1975-12-09
•
Expires: 1994-04-22
Abstract
Abstract A Crane has a shiftable counterweight thereon. The counterweight is shifted by a fluid ram which can also be used to remove or mount the counterweight relative to the crane.
Inventors
- 👤 Gerald P Lamer
- 👤 Ronald L Zyduck
- 👤 David F Roesler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:50
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/72; B66C23/74; B66C23/76
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
235 words
In a crane having a base with an extensible and retractable boom supported on said base; a counterweight; counterweight support structure including a counterweight carriage having first and second relatively extensible and retractable elements; horizontal pivot means supporting one of said elements for pivotal movement on said base; releasable counterweight connecting means on said other element for supporting said counterweight; extensible fluid ram means having one end connected to said base and an opposite end connected to said other element for extending and retracting said elements; and support mEans on said base cooperating with said counterweight carriage, said support means including a member fixed to said base and extending along said one element above said horizontal pivot means and releasable latch means carried by said member and including a pair of vertically depending legs being located on opposite sides of said one element at a location spaced from said horizontal pivot means with free ends located below a lower edge of said one element, said releasable latch means also including releasable pin means extending between said legs below said lower edge, said releasable latch means defining a cradle supporting said counterweight carraige so that said support means (1) normally supports said carriage in a substantially fixed position relative to said base and (2) accommodates pivotal movement of said counterweight carriage on said base so that said counterweight may be lowered and removed from said base.
Claim 2
Dependent Claim
235 words
In a crane having a base with an extensible and retractable boom supported on said base; a counterweight; counterweight support structure including a counterweight carriage having first and second relatively extensible and retractable elements; horizontal pivot means supporting one of said elements for pivotal movement on said base; releasable counterweight connecting means on said other element for supporting said counterweight; extensible fluid ram means having one end connected to said base and an opposite end connected to said other element for extending and retracting said elements; and support mEans on said base cooperating with said counterweight carriage, said support means including a member fixed to said base and extending along said one element above said horizontal pivot means and releasable latch means carried by said member and including a pair of vertically depending legs being located on opposite sides of said one element at a location spaced from said horizontal pivot means with free ends located below a lower edge of said one element, said releasable latch means also including releasable pin means extending between said legs below said lower edge, said releasable latch means defining a cradle supporting said counterweight carraige so that said support means (1) normally supports said carriage in a substantially fixed position relative to said base and (2) accommodates pivotal movement of said counterweight carriage on said base so that said counterweight may be lowered and removed from said base.
Claim 3
Dependent Claim
74 words
A crane as defined in claim 1, in which said ram means includes first and second extensible and retractable ram elements movable between fully retracted and fully extended positions, said ram elements, when moved to the fully extended position, pivoting said counterweight carriage away from said releasable pin means to allow for removal of said releasable pin means to accommodate pivotal movement of said counterweight carriage away from said member and lower said counterweight.
Claim 4
Dependent Claim
21 words
A crane as defined in claim 2, in which said carriage elements are polygonal and are telescoped relative to each other.
Claim 5
Dependent Claim
42 words
A crane as defined in claim 3, in which said releasable counterweight connecting means normally holds said counterweight fixed with respect to said other carriage element and incorporates releasable means to accommodate relative pivotal movement between said other element and said counterweight.
Claim 6
Dependent Claim
172 words
In a crane having a base with an extensible and retractable boom supported on said base; a counterweight; a counterweight carriage having first and second elongated relatively extensible and retractable elements; horizontal pivot means supporting one of said elements for pivotal movement on said base; means on said other element for supporting said counterweight; extensible fluid ram means having one end connected to said base and an opposite end connected to said other element for extending and retracting said elements; a substantially horizontal elongated support arm on said base extending generally parallel to and above said one of said elements; and releasable latch means carried by said arm and cooperating with said counterweight carriage for normally supporting said carriage in a substantially fixed position on said base for horizontal movement of said elements relative to each other, said latch means being selectively releasable to accommodate pivotal movement of said counterweight carriage on said base so that said counterweight may be lowered by said extensible fluid ram means and removed from said base.
Claim 7
Dependent Claim
172 words
In a crane having a base with an extensible and retractable boom supported on said base; a counterweight; a counterweight carriage having first and second elongated relatively extensible and retractable elements; horizontal pivot means supporting one of said elements for pivotal movement on said base; means on said other element for supporting said counterweight; extensible fluid ram means having one end connected to said base and an opposite end connected to said other element for extending and retracting said elements; a substantially horizontal elongated support arm on said base extending generally parallel to and above said one of said elements; and releasable latch means carried by said arm and cooperating with said counterweight carriage for normally supporting said carriage in a substantially fixed position on said base for horizontal movement of said elements relative to each other, said latch means being selectively releasable to accommodate pivotal movement of said counterweight carriage on said base so that said counterweight may be lowered by said extensible fluid ram means and removed from said base.
Claim 8
Dependent Claim
79 words
A crane as defined in claim 5, in which said elements have cooperating stop means that define a fully extended position for said elements so that extension of said fluid ram means will cause engagement of said stop means and continued extension will pivot said carriage about said horizontal pivot axis to accommodate release of said latch means and subsequent retraction of said fluid ram means will pivot said carraige about said horizontal pivot axis to lower said counterweight.
Claim 9
Dependent Claim
30 words
A crane as defined in claim 5, in which said latch means includes a removable pin extending below said one element for normally supporting said carriage in a fixed position.
Claim 10
Dependent Claim
17 words
A crane as defined in claim 7, in which said counterweight is pivotally supported on said carriage.
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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |