US1378981A - Dock-crane - Google Patents

Description

,F. L. SABIN. DOCK CRANE. APPLICATION FILED OCT-24.17919.

Patented May 24, 1921-.

3 SHEETS-SHEET l.

F. L. SABIN.

DOCK CRANE.

APPLICATION FILED 02124, 19w.

1,378,98 1, Patented May 24, 1921.

3 SHEETSSHEET 3.

.3212. v eial agf the appended claims.

UNITED srArlzs PATENT coFFicE.

FORD L. sAnIN, OlbLEvELAND HEIGHTS,- OHIO, ASSIGNOR 'ro rim WELLMAN- SEAVER-MOBGALN OHIO.

To all whomit may concern: a V o Be it known that I, Fonn L. SABIN, a citizen of the United States, residing at Cleveland Heights, in the county of Cuyahoga and State of Ohio, have inventedfa certain new and useful Improvement 'in Dock- Cranes, of which the following is a full, clear, and exact description. 7

This invention relates to an improved dock crane of a type which is designed tobe run along or to be positioned at any point on a dock, and having a boom whose outer end isintended to project over a boat to be loaded or unloaded, and whose inner end is adapted to project into a dock shed so that by means of a trolley movable along the boom, merchandise may be transferred from the vessel to the shed, or vice versa. v

The-principal object of the invention-is to provide a construction by which the outer part ofthe boom can be elevated and swung clear of the boat rigging, and the inner end of the boom may at the same time be moved outward-1y so as to clear the uprights of the shed, thus allowing the crane as a whole to be moved along, the dock.

In the embodiment of my invention herein illustrated a boom composed of two hinge' d -parts is utilized, and provision is made for moving the inner portion of the boom inan .endwise direction along a suitable tracliwa y of, the crane structure while the-outer part' of the boom is adapted to be swung; vertically. filhe construction is such that when it is desired to move the crane along the dock; the inner section of the boom is moved outwardly so as to clear the shed and at the same time. through the power which impartsendwise movement to theinner section, the outer section is swung upwardlyi w a a f o The invention may be'furtherbriefly summarized as consisting in certain novel: de-

tails ofconstru'ction: and combinations and arrangements of partsjwhich' will be described in the specification and set forth in In the accompanyin 1 sheet of drawin s, wherein I have-shown't e preferred embodiment of the invention, Figure" l is a side view of a"crane embodying my invention with thedock and other parts with which COMPANY; or CLEVELAND, onro, AcoRPoRATIoN or DOCK-CRANE.

Specificationof Letters Patent. Patented fllay 24, 1921 Application filed October 24, 1919, Serial No. 332,967.

the crane is'utilized being shown in section or endeleva'tion. Fig. 2' is an enlarged longitudinal sectional view taken through'the boom when the latter isin a position permitting the crane to be moved along the dock Fig. 8 is a transverse sectional view through a portion of the crane structure showing also delivered from a boat 12. Adapted to travel along the dock at the front of the shed 1-1 is a crane structure 13 which in-this instance runs along the lower rail 14 and an upper rail 15 carried by the dock shed. Merchandise is adapted to be transferred from the boat to the shed, or from the shed to the boat by a trolley, indicated at 16 adapted to travel along aboom 17 which when in position for transferringthe merchandise is preferably inclined substantially as shown-in Fig. 1', andhas'its outer end extending over the boat and its inner end extendinginto dock shed. It: will be .seen therefore that topermit the crane to be transferred along the dock, the outer .end' of the boom must be raised so as w th i the boat rigging and the inner end of the boom must be moved outwardly so' as to clearthe uprights at the frontoflthe dbck shed". It is important also that when the boom is shifted to permit the crane'to Jbe moved ,-the-inner end of the boom be given such a movement that will not s'trikefor interfere with cars. such" as shown at 1 8,

shedand the edge of thedock To accomplish this result it has heretofore which may be on tracks between the dock been proposed to? pivot; the boom, on the cranestru'cture for movement about atransverse axis the pIVOt point being at some point between the ends of the boom, and it has been' proposed alsoto first shift the entire boom in an endwi'se direction in the crane structure, and thento swing it about atransverse axis. c

The arrangement or structure contemtion 17 Additionally, I provide in the crane structure trackways 20, 20, along which the inner section 17 of the boom is adaptedto travel in an endwise direction. In this instance the trackways are formed by pairs of oppositely disposed rails 20?,

20, which rails are positioned in the crane structure a suitable distance apart on the opposite sides of the longitudinal axis of the boom. i

In this case the two trackways on opposite sides of the boom axis are spaced a distance apart. which is considerably wider than the boom proper, and the inner section 17 of the boom is provided with a laterally extending portion 21 at the sides of which are track wheels 22 which engage the rails forming the trackways. Prefe ably the trackw-ays are inclined as shown on Figs. 1 and 2, so that when the boom is in operative position with the forward section 17 in alinement with the rear section 17, the boom will be inclined as previously stated. This facilitates the transporting of merchandise from the boat to the dock, since the trolley can be run down the boom by gravity. A further advantage of the inclined normal position of the boom lies in the fact that the boom can be restored to its normal position by gravity.

In order that the axial movement of the rear section and the swinging movement of the forward section. of the boom may take place simultaneously, through power ap plied at one point, the forward section of the boom is connected to the top of the crane structure by a more or less rigid arm or rod 23. This rod is pivoted at one end to the boom section at 23*, and is pivoted to the top ofthe frame structure at 23 By reason of this construction the outward endwise movement of the rear boom sectionis accompanied by an upwardswinging. of the outer boom section, and the inward endwise movement of the inner boom section is accompanied by the downward swinging movement of the outerboom section, until both boom sections are in direct alinement.

The boom can be shifted in the manner just stated in different ways, .but in this instance by a cable 24; adapted to be wound onto and unwoundfrom a drum 25 located in the operators station 26 on the crane structure. In this instance both ends of the cable pass about the drum and from the drum, both portions of the cablepass forwardly about a pair of sheaves 27, which are supported on the crane structure (see Fig. 4). Then both portions of the cable pass rearwardly to and around a pair of sheaves 28 carried by the boom, then they pass forwardly around aipairof sheaves 29 arranged coaxially with respect to the sheaves 27 then again rearwardly and around a horizontal sheave 30, likewise carried by the boom structure. With this arrangementby winding in on the cable the inner or rear section of the boom is pulled outwardly along the trackways, this movement being accompanied by the upward swinging movement of the outer boom section. And when the cable is paid out the boom section 17 runs down the trackways to its normal position, where a stop is encountered which limits its inward movement, this inward movement of the boom section 17 being accompanied by the downward: swinging ofthe outer boom section.

It might be mentioned thatin Fig. 1 the boom is in its normal position, and that in Figs. 2 and 4 the boom orso much of it as is shown in these figures is in its abnormal position which permits the crane as a whole to be transported along the dock. It will be noted also by reference to Fig.2 that. when the boom has been given its full movement from normal to abnormal position the forward end of the inner boom section 17 is at the front ofthe crane structure 13, the for- U ward part of wheels 22 which travel along the trackways of the boom structure then being at the extreme forward ends of the trackways. Likewise when the boom is in the position stated the forward section 17 is U ing immaterial to my invention. It will be suflicient to state that the trolley fore referred to will have suitable track wheels 16 designed to travel along two rails 31 of the boom, as shown in Fig. 3, which 16 heretorails are of course carried part'by the endwise movable section 17 and part by the swinging boom section 17", the joint occurring in the trolley rails at the jointor pivot point ofthe two boom sections. It is important that when the two boom sections ar e in alinement ready for use, the portionsof the trolley rails carriedby the 'tw'o boom sections'be in alinement or sufliciently close alinement that the trolley can readily pass over the rail joints. The trolley, is moved along the boom and trolley hook or load carrying device is raised and lowered by cables 32 and. 33 which pass about. suitable drums 34.- and 35in the operators shed 26, these drums, as well as the boom shifting drum being all motor operated in any suitable manner. 1"

I do not desire to be confined to the exact detail shown but aim in my claims to cover all modifications which do not involve a departure from the spirit and scope of my invention in its broadest aspects.

Having described my invention, I claim- 1. A dock crane comprising a crane structure having a boom for a trolley, the boom being composed of relatively movable sections along both of which the trolley is adapted to travel, one section mounted for endwise movement in the crane structure.

2. A dock crane comprising a crane structure having a boom fora trolley, the boom being composed of hinged or pivoted sections along both of which the trolley is adapted to travel, one section mounted for endwise movement in the crane structure.

3. A dock crane comprising a crane structure having a boom for a trolley, the boom being composed of an inner section mounted for endwise movement in the crane structure, and an outer section hinged to the inner section to swing vertically, said trolley adapted to travel along both sections.

4. A dock crane comprising a crane structure having a boom for a trolley, the crane structure having a trackway and the boom being composed of sections, one adapted to be shifted in an endwise direction along said trackway, and the other to be swung vertically relative to the crane structure, said trolley adapted to travel along both sections.

5. A dock crane comprising a crane structure having a boom for a trolley, the boom being composed of an endwise movable inner rection, and means for simultaneously causing the outer section to be swung on its pivot.

7. A dock crane comprising a crane structure having a boom for a trolley, said boom being composed of an endwise movable inner portion and a vertically swinging outer portion pivoted to the end of the inner portion, power means connected to the inner portion for moving it endwise, and means connecting the outer portion to the crane structure so that the said outer portion is swung verti cally when the inner section is moved in an endwise direction by said power means.

In testimony whereof I hereunto aflix my signature.

FORD L. SABIN.

Images