Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3923407 A
Publication typeGrant
Publication dateDec 2, 1975
Filing dateFeb 6, 1974
Priority dateFeb 6, 1974
Also published asCA1010825A1
Publication numberUS 3923407 A, US 3923407A, US-A-3923407, US3923407 A, US3923407A
InventorsLyle B Jensen, Robert E Thune
Original AssigneeFmc Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Mechanism for connecting and disconnecting crane sections
US 3923407 A
Abstract
There is disclosed a crane having a base section, and an upper section separable from the base section. An anti-friction bearing on which the upper section swings relative to the base section has an outer race member connected to the base section. The inner race member of the bearing receives therein a ring on the upper section when the upper section is mounted on the base section. Opposing circumferential grooves in the ring and inner race member receive a locking ring which is expanded and contracted by a power actuator. When the ring bridges the grooves, the upper crane section is locked to the crane base section, and when the ring is contained entirely in one of the grooves, the crane upper section is released from the crane base section for separation of the sections.
Images(6)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

[ Dec.2,l975

United States Patent [191 Jensen et al.

[ MECHANISM FOR CONNECTING AND DISCONNECTING CRANE SECTIONS Primary Examiner-Andrew V. Kundrat [75] Inventors: Lyle B. Jensen; Robert E. Thune, Attorney Agent or Firm Verhoeven;

Tripp both of Cedar Rapids, Iowa [57] ABSTRACT There is disclosed a crane having a base section, and

[73] Assignee: FMC Corporation, San Jose, Calif.

Filed:

Feb. 6, 1974 Appl. No.: 440,120

member connected to the base: section. The inner race member of the bearing receives therein a ring on the 60 60 21 ll 2 ;G 26 21 3F 3 0 3n 0 4 l 0 SHL Uh mm 55 upper section when the upper section is mounted on the base section. Opposing circumferential grooves in the ring and inner race member receive a locking ring which is expanded and contracted by a power actuawww 2 11 M22 ;3 36 @n& 2 2 Ami 2 2 2 4 3 1 NZMU O2 4W/ 00 4 n 2 wh .37 h! N 3 e 1 S w 47 d 6 l e i F 8 5 References Cited tor. When the ring bridges the grooves. the upper ITED STATES PATENTS UN crane section is locked to the crane base section, and

ee hh tt f 0m rn m 8 5 k m m Wm we mb m F t nn g i im m mm W d e m m .m PD m w 8 n OPO S C cl m e .1 .wnm h mm C n e 8 lm m m S e mon mm W C OO 7 77 22 //.l.2/ 22 /5 l 008 22/02 .53 8.

Eaton......... Bargmann..,.................... 970 l-lanes et al.

US" Patent Dec. 2, 1975 Sheet 1 of 6 3,923,407

US. Patent Dec. 2, 1975 Sheet 2 of6 3,923,407

U, amnt Dec. 2, 1975 Sheet 3 of6 3,923,407

US. Patent Dec. 2, 1975 Sheet 4 of6 3,923,407

US. Patent Dec. 2, 1975 Sheet 6 of6 3,923,407

MECHANISM FOR CONNECTING AND DISCONNECTING CRANE SECTIONS BACKGROUND OF THE INVENTION Because of the size and weight of large cranes, it is often necessary to disassemble the cranes to transport them from one job site to another. The disassembly of the crane is usually accomplished by removing the upper section, or superstructure, of the crane from the base section of the crane.

Commonly, the upper section of the crane is connected to the lower section of the crane by a large number of high torque bolts which must be removed to separate the upper section of the crane from the lower section thereof. The removal of the bolts on disassembly takes considerable time and effort.

In another method of securing the upper crane section to the lower crane section, a series of cotter type joints are used wherein tangs on one section extend through the base plate of the other section. Each tang has an opening to receive a wedge member which acts as a cotter. Again, removal and replacement of a multitude of wedge members takes time and effort.

Still another method of assembly and disassembly of the upper section of a crane with the lower section thereof has been proposed in the copending United States patent application of Petrik and Dvorsky to Disconnect Mechanism For Upper Section of Crane, filed Feb. 6, 1974, US. Ser. No. 440,233 assigned to the same assignee as the present invention. In this latter method, an interrupted ring member on the upper crane section fits within the inner race member of the turntable bearing which is mounted in the crane base section. Interrupted surfaces on the ring member and on the inner race member, in the form of teeth, define locking surfaces when a power-operated actuator rotates the inner race member relative to the upper crane section to place the teeth of the race member in overlying relationship to the teeth of the ring member. The upper crane section is released from the lower crane section when the power-operated actuator reverses the rotation of the inner race member to a position where the teeth of the race member are in staggered relation to the teeth of the upper section ring member to permit removal of the ring member from the race member.

SUMMARY OF THE INVENTION In the present invention, the upper crane section is detachably secured to the crane base section by means of a power-actuated locking member which, in the locking position, bridges members connected, respectively, to the upper crane section and the crane base section. One of the bridged members, however, as in the Petrik and Dvorsky application Ser. No. 440,233, is not connected rigidly to one of the sections but is rotatable with respect thereto. In the preferred form of the invention, the locking member is in the form of a ring which is received in the external groove of an annular ring member housing secured to the upper crane section. The crane turntable bearing on which the upper section of the crane swings relative to the base section has an outer race member secured to the crane base section and an inner race member into which the ring member housing of the upper crane section is received when the crane sections are assembled. A power actuator extends between the ends of the locking ring member and can selectively expand or contract the ring. A

groove in the inner race member of the turntable bearing, in opposing relation to the groove in the upper section ring member when the crane sections are in assembled relation, receives a portion of the ring member when the ring member is expanded, thus bridging the grooves and locking the crane upper section to the inner race of the turntable bearing on the crane base section. When the ring member is contracted entirely into the ring member housing, the crane upper section can be separated from the crane base section.

It is therefore one object of the present invention to provide mechanism for easy locking and releasing of the crane upper section with the crane base section.

It is another object of the present invention to detachably secure the upper crane section to the crane base section by means of a power actuated locking member bridging the two sections.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a crane embodying the present invention.

FIG. 2 is a fragmentary view, in perspective, of portions of the crane upper section and the crane base section when the sections are separated.

FIG. 3 is a plan view of the mechanism, shown in look position, connecting the crane upper section to the crane base section.

FIG. 4 is a fragmentary view, taken as the view of FIG. 3, showing the mechanism in release condition.

FIG. 5 is a view taken on the lines 5-5 of FIG. 3.

FIGS. 6, 7 and 8 are views taken as the view of FIG. 5 but showing different embodiments of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS There is shown in FIG. 1, a crane 10 having a base section 12 and an upper, or superstructure, section 14 which is mounted on the base section for rotation relative thereto. In the crane disclosed for illustrative purposes, the base section 12 is mounted on wheels 18, but it should be understood that other motive means, such as an endless crawler track, could be used instead. Alternatively, the base section could be fixed, as on a pedestal on an off-shore drilling platform or on a floating ship or barge. The base section 12 has a cab 20 for drilling the crane, or at least the base section thereof, over the highway. The upper section 14 also has a cab 22 which is for the crane operator during operation of the crane on the job site.

As shown best in FIG. 2, an outer race member 24 of a anti-friction bearing 26 is secured to the base section 12 by bolts 28. As shown best in FIG. 5, the bearing has an annular inner race member 30 which is rotatably supported on the outer race member through a circle of balls 32.

The upper section 14 of the crane has a depending ring portion, or member, 34 which has an external circumferential groove 36. The inner race member 30 has an internal circumferential groove 38 which, when the upper crane section is assembled with the base section resting on the inner race member 30 as shown in FIG. 5, is in registration with the groove 36 in the upper section ring 34.

A locking ring 40 is carried in groove 36 of ring 34. As shown best in FIGS. 2, 3 and 4, the locking ring 40 is split, at 42, and a tab 44 is secured at each end to extend inwardly therefrom. A hydraulic ram 46 is connected between the tabs and is selectively extendable and retractable to expand and contract the ring 40. The ring 34 is cut away, as at 34a,-to accommodate the tabs 44 and ram 46.

The ring 40 is shown fully-contracted (that is, with minimum diameter) in FIGS. 2 and 4. When contracted, the ring 40 fits entirely within the groove 36 of the upper crane section ring 34, which constitutes a housing for the locking ring 40. When the locking ring 40 is entirely within housing 34, the upper crane section 14 can be raised or lowered (as by removable jacks 48 or with an auxiliary crane or hoisting device), with ring 34 moving telescopically with respect to the inner race member 30.

When the ram 46 is extended, the ring 40 expands, increasing the diameter thereof, and the ring 40 moves into the groove 38, to bridge both grooves 36 and 38 as shown in FIG. 5. The groove 38 is wedge-shaped, with tapered upper and lower surfaces 38a and 38b. The top and bottom edges 40a and 40b of ring 40 are tapered toward the outer periphery 400 of the ring to form a wedge. When the ring 40 is expanded, the upper portion 30a of race member 30 is gripped between the ring 14a on upper section 14 and the upper surface 40a of locking member 40, as shown in FIG. 5. When the ring 40 tightly grips the inner race member 30, an adjustable link 50 is connected between the ends of the ring, adjacent to ram 46, as shown in FIG. 3. The link 50 is adjusted to hold the ring 40 and race member 30 in gripping relationship.

When ring 40 is held tightly with race member 30, as shown in FIG. 5, the upper section of the crane will be resting on, and secured tightly to, the inner race member 30. At that time, the weight of the upper crane section is transmitted through inner race member 30, the ring of balls 32, the outer race member 24, to the crane base section 12.

It should be noted that the upper section of the crane, when assembled to the base section, is rotatable about an axis A through the center of the bearing. The rotary power is supplied by a hydraulic motor (not shown) or other suitable swing drive mechanism mounted in the upper crane section. The hydraulic motor has a motor shaft 52 with a pinion 54 mounted thereon. Pinion 54 is engaged with teeth 56 on the outer periphery of the outer race 24 of bearing 26. Operation of the hydraulic motor, which is reversible, rotates the upper section of the crane in one direction and the other.

In order to release the upper crane section from the crane base section, the link 50 is removed and then the locking ring 40 is contracted by the ram 46, which constitutes a power operated actuator. After the ring 40 is contracted entirely within groove 36 of ring 34, the upper crane section can be lifted off the inner race member 34 of the bearing and transported separately from the base section to a new job site.

In the embodiment of the invention shown in FIGS. 1 to 5, the bearing is mounted in the base section of the crane, and the upper crane section is selectively locked to the inner race member thereof by means of an expandable locking ring. It will be evident from FIGS. 6, 7 and 8 that other arrangements of the bearing and locking ring can be used to releasably lock the upper crane section to the base section.

In the embodiment of FIG. 6, the bearing 126 has an inner race member 130 which is secured to the upper crane section 114 by bolts 128. The outer race member 124, which is separated from the inner race member by a ring of balls 132, has a tapered groove 138 therein. A

ring 134 is secured to the crane base section 112, and has a diameter slightly greater than a necked lower portion 124a of outer race member 124. The necked portion 124a defines a shoulder 12412, with the main portion of the outer race member 124, which rests on the upper surface 134a of the ring 134 when the upper crane section is mounted on the lower crane section in assembled relation.

The ring 134, which defines a housing for a locking ring 140, has a groove 136 which is in registration with groove 138 when the crane sections are in assembled relation. The locking ring 140 is split, as ring 40, and has a ram (not shown) connected between its ends in the same manner as ram 46. When'the ring is expanded by extension of the ram, the ring is held entirely within the groove 136, and the upper section of the crane can be lowered onto, or raised from, the base section. When the ram is contracted, the ring 140, which has tapered upper and lower edges like the ring 40, can be wedged into groove 138, thereby bridging the two grooves 136, 138, to force the outer race member 124 of the bearing down onto the upper surface 134a of ring 134, thereby holding the upper crane section on the base section. An adjustable link, similar to link 50, is secured between the ends of the ring 140 to hold the ring in the locking position.

In the embodiment of FIG. 7, the inner race member 230 of a bearing 226 is secured to the base section 212 by bolts 228. The outer race member 224 is supported on the inner race member by a circle of balls 232. A ring 234 on the upper section of the crane fits over the outer race member 224 when the crane sections are in assembled relation.

A tapered groove 238 in the outer periphery of the outer race member 224 is in registration with a groove 236 in ring 234 when the crane sections are in assembled relation, with the upper crane section 214 resting on the upper surface 224a of the outer race member 224. A ring 240 is housed in groove 236 of the ringshaped housing 234. The ring 240 is split, as ring 40, and has a ram (not shown) between its ends as the ram 46. When the ram is contracted to wedge the ring 240 into groove 238, the ring will bridge the grooves 236 and 238 to force the upper crane section 214 down onto the upper surface 224a of outer race member 224, thereby locking the crane upper section to the crane base section. When the ring is expanded to fit entirely within groove 236, the upper section of the crane will be released from the base section for separation therefrom.

In the embodiment of FIG. 8, the outer race member 324 of a bearing 326 is secured to the upper section of the crane 314 by bolts 328. The inner race member 330 of the bearing is separated from the outer race member by a circle of balls 332. The inner race member has a necked portion 330a which is received around a ring 334 secured to the crane base section 312 when the crane sections are in assembled relation. A shoulder 330b, which is formed where the necked portion of the inner race member joins the main portion of the race member, seats on the upper portion 334a of the ring is wedged into tapered groove 338 when the ram is extended. At that time, the locking ring will bridge the grooves and lock the crane sections together by forcing the shoulder 33% onto the upper surface 334a of the ring. An adjustable link, similar to link 50, holds the locking ring in the locking position. When the link is removed and the ram contracted, the locking ring will lie completely within groove 336. With the locking ring inside groove 336, the crane sections can be disassembled for separate transportation to a new job site.

It will be noted that in each embodiment of the invention, a socket member is defined on one of the crane sections (inner race member 30 on base section 12 in FIG. 5; ring 134 on base section 112 in FIG. 6; ring 234 on upper section 214 in FIG. 7; inner race 330 on upper section 314 in FIG. 8), and a fitting member is defined on the other crane section (ring 34 on upper section 14 in FIG. 5; outer race 124 on upper section 114 in FIG. 6; outer race 224 on base section 212 in FIG. 7; ring 334 on base section 312 in FIG. 8).

Although the best mode contemplated for carrying out the present invention has been herein shown and described, it will be apparent that modification and var iation may be made without departing from what is regarded to be the subject matter of the invention.

What is claimed is:

1. In a crane having a base section and having an upper section, said crane having a bearing with relatively rotatable inner and outer portions interposed between said sections, one of said bearing portions connected to one of said sections, the improvement comprising a locking member mounted in the other of said sections and shiftable relative thereto, and a power operated actuator connected to said locking member to shift said member into and out of locking engagement with the other of said bearing portions.

2. In a crane having a base section and having an upper section, said crane having a bearing with relatively rotatable inner and outer portions interposed between said sections, said outer bearing portion connected to said base section, the improvement comprising a locking member mounted in the upper section and shiftable relative thereto, and a power actuator connected to said locking member to shift said member into and out of locking engagement with the inner bearing portion.

3. In a crane having a base section and having an upper section, said crane having an antifriction bearing with inner and outer race rings interposed between said sections, said outer race ring connected to said base section, the improvement comprising a locking member mounted in the upper section and shiftable relative thereto, and a power actuator connected to said locking member to shift said member into and out of locking engagement with the inner race ring.

4. In a crane having a base section and having an upper section with a depending ring, said crane having an antifriction bearing with inner and outer race rings interposed between said sections, said inner race ring receivable over said depending ring and said outer race ring connected to said base section, the improvement comprising, means defining opposing grooves in said depending ring and said inner race ring, a locking ring received in said grooves, and a power actuator to ex- 6 pand and contract said locking ring from a position bridging both grooves to a position within one of said opposing grooves.

5. In a crane having a base section and having an upper section with a depending ring, said crane having an antifriction bearing surrounding said depending ring, said antifriction bearing having an inner ring surrounding said upper section dlepending ring and having an outer race connected to said base section, a groove in said upper section depending ring and a groove in said antifriction bearing inner race, said grooves in registration when the upper section of the crane is mounted on the base section, :a locking ring mounted in the groove of the upper section depending ring, and a power actuator connected to said locking ring to expand said ring to bridge both grooves and to contract said ring into the groove of the upper section depending ring.

6. In a crane having a base section and having an upper section, said crane having a bearing with relatively rotatable inner and outer race rings interposed between said sections, one of said race rings connected to one of said sections, the improvement comprising a locking ring mounted in the other of said sections for expansion and contraction relative thereto, and a power operated actuator connected between the ends of said locking ring to change the diameter thereof for locking engagement with the other of said race rings.

7. In a crane having a base section and having an upper section removably mounted on the base section, said crane having a bearing with relatively rotatable inner and outer race rings interposed between said sections, one of said race rings connected to one of said sections, the improvement comprising a peripheral groove in the other of said sections and in the other of said race rings, said peripheral grooves being in alignment when the upper section of the crane is mounted on the base section of the: crane, a locking ring mounted in one of said peripheral grooves, and a power actuator connected between the ends of said locking ring to alter the diameter of the locking ring to bring the locking ring into bridging relationship with both of the grooves.

8. In a crane having a base section and having an upper section, said upper section having a depending portion and said crane having a bearing with relatively rotatable inner and outer portions interposed between the base section and the depending portion of said upper section, said outer bearing portion connected to said base section, the improvement comprising a peripheral groove encircling the inner bearing portion and a peripheral groove encircling the depending portion of said upper section, said peripheral grooves being in alignment when the upper section of the crane is mounted on the base section of the crane, a locking ring mounted in one of said peripheral grooves, and a power actuator connected between the ends of said locking ring to alter the diameter of the locking ring to bring the ring into bridging relationship with both of the grooves and exert a locking action between, and completely around, the inner bearing portion and the depending portion of said upper section.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION 3,925,407 December 2, 1975 Patent No. Dated Inventor(s) Lyle B. Jensen et al It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

In the Abstract, line 2, delete "An" and insert A Column 2, line 45, delete "dril-" and insert driv- Column 2, line 46, delete "ling" and insert ing Signed. and Sealed this twenty-ninth Day of June1976 [SEAL] Y. Arrest:

kum c. MASON c. MARSHALL DANN Arresting Officer I Commissioner oflatems and Trademarks

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1052439 *Jan 18, 1910Feb 4, 1913American Hoist & Derrick CoDerrick.
US1473935 *Aug 1, 1922Nov 13, 1923John T HortonDerrick base
US2877732 *Sep 25, 1953Mar 17, 1959Eaton Frederic NJoint for connecting sections of torpedoes or other cylindrical vessels
US3061389 *May 22, 1959Oct 30, 1962Bargmann H E ErwinCrane swivel connection
US3521911 *Mar 6, 1968Jul 28, 1970Vetco Offshore Ind IncLockable and unlockable,releasable tool joints
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4273244 *Jan 29, 1979Jun 16, 1981Fmc CorporationCrane upperstructure self-transferring system
US4332328 *Oct 3, 1979Jun 1, 1982Firma Leo Gottwald KgMobile crane
US4478340 *Apr 26, 1982Oct 23, 1984American Hoist & Derrick CompanySwing bearing quick removal system
US5176267 *Jul 23, 1990Jan 5, 1993The Manitowoc Company, Inc.Quick disconnect system for construction equipment with rotatable upper works
US5353940 *Jan 8, 1993Oct 11, 1994The Manitowoc Company, Inc.Alignment system for crane works and method of alignment
US5382046 *Feb 25, 1991Jan 17, 1995Trw Inc.Air bag module installation structure and method
US5427256 *Sep 20, 1991Jun 27, 1995The Manitowoc Company, Inc.Crane upper works to lower works alignment system
US5621987 *Jun 8, 1995Apr 22, 1997Rockland, Inc.Implement coupling assembly for excavator machines and the like
US6010018 *Apr 3, 1997Jan 4, 2000Manitowoc Crane Group, Inc.Swing lock mechanism
US6523708 *Aug 7, 2001Feb 25, 2003Demag Mobile Cranes Gmbh & Co. KgMobile crane with a releasable coupling connecting the substructure to the superstructure
US7419064 *Feb 9, 2007Sep 2, 2008Kobelco Cranes Co., LtdWorking machine
CN100528732CMar 2, 2007Aug 19, 2009神钢起重机株式会社Working machine
EP0126302A2 *Apr 18, 1984Nov 28, 1984Fmc CorporationCentering arrangement for redecking of upper crane
EP0126303A2 *Apr 18, 1984Nov 28, 1984Link-Belt Construction Equipment CompanyCrane undecking arrangement
EP0221578A2 *Apr 18, 1984May 13, 1987Link-Belt Construction Equipment CompanyHydraulic circuit for self-undecking crane
Classifications
U.S. Classification403/165, 212/181, 403/322.3
International ClassificationF16C35/073, B66C23/84, B66C23/26, E02F9/12
Cooperative ClassificationB66C23/84, F16C2300/14, F16C35/073, F16C19/163
European ClassificationF16C19/16A, B66C23/84, F16C35/073