US809674A - Crane. - Google Patents

Crane. Download PDF

Info

Publication number
US809674A
US809674A US25000205A US1905250002A US809674A US 809674 A US809674 A US 809674A US 25000205 A US25000205 A US 25000205A US 1905250002 A US1905250002 A US 1905250002A US 809674 A US809674 A US 809674A
Authority
US
United States
Prior art keywords
boom
post
crane
frame
winch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US25000205A
Inventor
William B Erskine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US25000205A priority Critical patent/US809674A/en
Application granted granted Critical
Publication of US809674A publication Critical patent/US809674A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S212/00—Traversing hoists
    • Y10S212/901—Dolley-type cranes

Definitions

  • This invention is a crane designed especially for portable use, and characterized particularly by improvements in the manner of supporting a swinging boom which will permit heavier loads to be lifted without tilting or upsetting the. structure than would otherwise be the case.
  • Figures 1 and 2 are respectivelylside and front elevations of the crane.
  • the base of the crane consists of a squared frame formed of sills 6, across the middle of which extends a center sill 7, upon which the post 8 is mounted. This ost is supported by braces 9, extending rom each corner of the base to a casting 10, through which the post 8 extends. At the top the post has a bearing-casting 11.
  • the boom is indicated at 12, and it is pivoted at 13 between the upper ends of side pieces 14, which rest upon a ring 15, fitting upon the shoulder of the casting 10.
  • the winch 17 is carried at the outer ends of arms 18, secured to and projecting from the pieces 14 and braced by bars 19 extendin to the pivot 13.
  • the rope 20 of the winc is connected to the rear end of the boom.
  • the pieces 14, which support the boom are inclined to one side or backwardly from the Vertical, so that the pivotal point of the boom is not directly over the center of the frame G-that is it is not in line with the post S-but is 0H to the rear thereof, bringing the center of gravity toward the rear side of the base-frame during the lifting operation, giving the effect of a backwardly-inclined fulcrum-post, causing the weight of the boom and frame to pull against or tend to counterbalance the weight being lifted, so that there is less tendency to tip or upset the crane.
  • This is an im otant feature in light or portable eranes, t e bases of which cannot welly be fastened to the ground or other foundation.
  • the boom and winch and their supporting-frame are rotatable around the post 8.
  • the main bearing-weight comes on the ring 15 and castinglO, and inasmuch as the latter rests directly upon the braces 9 the pressure is transmitted directly to said braces with less strain on the post than would otherwise be the case.
  • a crane in combination, a post, a rotatable frame mounted on the post and having uprights inclined backwardly from the per endicular, a boom fulcrumed on top of sai uprihts, and a winch carried by the frame an having its rope connected to the boom.
  • a post havinv upper and lower bearings, a frame rotatably supported on said bearings and having uprights extending above the top of the post and inclined baekwardly from the perpendicular, a boom fulcrumed on top of the uprights, and a winch carried by the frame and connected to the boom.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Description

UNITED sTATEs PATENT oEEIoE.
WILLIAM B. ERSKINE, OF MADISON MILLS, OHIO.
CRANE.
Specification of Letters Patent.
Patented Jan. 9, 1906.
Application iled March 14, 1905. Serial No. 250,002.
State of Ohio, have invented new and useful Improvements in Cranes of which the following is a specication.
This invention is a crane designed especially for portable use, and characterized particularly by improvements in the manner of supporting a swinging boom which will permit heavier loads to be lifted without tilting or upsetting the. structure than would otherwise be the case.
In the accompanying drawings, Figures 1 and 2 are respectivelylside and front elevations of the crane.
Referring specifically to the drawings, the base of the crane consists of a squared frame formed of sills 6, across the middle of which extends a center sill 7, upon which the post 8 is mounted. This ost is supported by braces 9, extending rom each corner of the base to a casting 10, through which the post 8 extends. At the top the post has a bearing-casting 11.
The boom is indicated at 12, and it is pivoted at 13 between the upper ends of side pieces 14, which rest upon a ring 15, fitting upon the shoulder of the casting 10.
16 indicates a ring, which fits upon the top bearing 11 and is connected to the bars 14 between the ends thereof.
The winch 17 is carried at the outer ends of arms 18, secured to and projecting from the pieces 14 and braced by bars 19 extendin to the pivot 13. The rope 20 of the winc is connected to the rear end of the boom.
It is to be noticed particularly that the pieces 14, which support the boom, are inclined to one side or backwardly from the Vertical, so that the pivotal point of the boom is not directly over the center of the frame G-that is it is not in line with the post S-but is 0H to the rear thereof, bringing the center of gravity toward the rear side of the base-frame during the lifting operation, giving the effect of a backwardly-inclined fulcrum-post, causing the weight of the boom and frame to pull against or tend to counterbalance the weight being lifted, so that there is less tendency to tip or upset the crane. This is an im otant feature in light or portable eranes, t e bases of which cannot welly be fastened to the ground or other foundation.
As is apparent from the drawings, the boom and winch and their supporting-frame are rotatable around the post 8. The main bearing-weight comes on the ring 15 and castinglO, and inasmuch as the latter rests directly upon the braces 9 the pressure is transmitted directly to said braces with less strain on the post than would otherwise be the case.
WVhat I claim as new, and desire to secure by Letters Patent, is-
1. In a crane, in combination, a post, a rotatable frame mounted on the post and having uprights inclined backwardly from the per endicular, a boom fulcrumed on top of sai uprihts, and a winch carried by the frame an having its rope connected to the boom. Y
2. In a crane, in combination, a post havinv upper and lower bearings, a frame rotatably supported on said bearings and having uprights extending above the top of the post and inclined baekwardly from the perpendicular, a boom fulcrumed on top of the uprights, and a winch carried by the frame and connected to the boom.
In testimony whereof I have signed my name to this. specification in the presence of two subscribing witnesses.
WILLIAM B. ERSKINE.
US25000205A 1905-03-14 1905-03-14 Crane. Expired - Lifetime US809674A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US25000205A US809674A (en) 1905-03-14 1905-03-14 Crane.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25000205A US809674A (en) 1905-03-14 1905-03-14 Crane.

Publications (1)

Publication Number Publication Date
US809674A true US809674A (en) 1906-01-09

Family

ID=2878155

Family Applications (1)

Application Number Title Priority Date Filing Date
US25000205A Expired - Lifetime US809674A (en) 1905-03-14 1905-03-14 Crane.

Country Status (1)

Country Link
US (1) US809674A (en)

Similar Documents

Publication Publication Date Title
US184168A (en) Improvement in derricks
US1175792A (en) Hay-stacker.
US809674A (en) Crane.
US1344659A (en) Counterbalanced crane
US1018529A (en) Derrick.
US681175A (en) Portable straw-stacker.
US849078A (en) Hoisting apparatus.
US426372A (en) Cotton-loading derrick
US327852A (en) Judson allen
US578495A (en) Derrick
US308486A (en) Derrick
US89416A (en) Improvement in derricks
US142740A (en) Improvement in derricks
US168412A (en) Improvement in cranes
US127789A (en) Improvement in hoisting apparatus
US201998A (en) Improvement in portable derricks
US486848A (en) Hay-elevator
US761159A (en) Hay-derrick.
US382141A (en) Derrick
US565990A (en) Hay elevator or carrier
US890655A (en) Derrick.
US764987A (en) Pole-derrick.
US1004048A (en) Lifting-machine.
US414284A (en) Derrick
US736004A (en) Wagon-box or hay-rack lifter.