US2786581A - Portable derricks - Google Patents

Portable derricks Download PDF

Info

Publication number
US2786581A
US2786581A US583322A US58332256A US2786581A US 2786581 A US2786581 A US 2786581A US 583322 A US583322 A US 583322A US 58332256 A US58332256 A US 58332256A US 2786581 A US2786581 A US 2786581A
Authority
US
United States
Prior art keywords
boom
base
link
hydraulic cylinder
derrick
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
US583322A
Inventor
Roy O Balogh
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.)
MCCABE POWERS AUTO BODY CO
MCCABE-POWERS AUTO BODY Co
Original Assignee
MCCABE POWERS AUTO BODY CO
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 MCCABE POWERS AUTO BODY CO filed Critical MCCABE POWERS AUTO BODY CO
Priority to US583322A priority Critical patent/US2786581A/en
Application granted granted Critical
Publication of US2786581A publication Critical patent/US2786581A/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
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/06—Cranes in which the lifting movement is done with a hydraulically controlled plunger
    • B66C2700/062—Cranes in which the lifting movement is done with a hydraulically controlled plunger mounted on motor vehicles

Definitions

  • derricks which can be used in lifting equipment up and down, setting poles, removing worn out or defective poles and replacing them, and similar types of work.
  • derricks are usually pivoted near the rear end of the truck body and extend forwardly in a substantially horizontal position over the top of the body when the truck is moving from place to place. This position is usually referred to as the transport position.
  • the derrick is elevated into various upwardly and rearwardly inclined positions usually referred to as work positions.
  • the primary object of the present invention to provide a power operated vehicle-mounted or portable derrick which can be swung from inoperative transport position to upright or work-position quickly, efficiently, and is capable of swinging through an are substantially greater than 180.
  • Figure 1 is a side elevational view of a utility maintenance truck equipped with a portable derrick constructed in accordance with and embodying the present invention
  • Figure 2 is a diagrammatic view of the hydraulic system forming a part of the present invention.
  • FIG. 3 is a fragmentary top plan view of the utility maintenance truck equipped with a portable derrick constructed in accordance with and embodying the present invention
  • Figure 4 is a fragmentary side elevational view showing the derrick in upright or work-position
  • FIGS 5 and 6 are fragmentary sectional views taken along lines 55 and 6--6, respectively of Figure 1;
  • Figure 7 is a fragmentary perspective view of a modified form of portable derrick constructed in accordance with and embodying the present invention.
  • Figure 8 is a fragmentary perspective view of a further modified form of portable derrick constructed in accordance with and embodying the present invention.
  • A designates a utility maintenance truck equipped with a so-called utility body 1 provided at its forward end with the drivers cab 2 and having rearwardly extending side walls 3, 4, disposed in spaced parellel relation and including a series of built-in cabinets 5, 6, '7, 8, for the storage of tools, small parts, and similar items of equipment ordinarily used by repair crews.
  • the side walls 3, 4, are spaced outwardly from each other and, together with the rear wall 9 of the cab compartment, define a cargo area a which is open at the top and rear.
  • Mounted on the floor 10 adjacent to the crew compartment 2 is a conventional cable winch assembly 11 having a cable 12.
  • the floor 10 is extended rearwardly beyond the rear vertical faces of the side walls 3, 4, in the provision of an extension 13 provided on its under face with depending clevis-brackets 14 from which ground jacks 15 are suspended.
  • brackets 16 Welded upon the rear faces of the side walls 3, 4, adjacent the upper ends thereof, are horizontally aligned brackets 16 and similarly welded on the upper faces of the side walls 3, 4, forwardly with respect to the brackets 16, are horizontally aligned auxiliary brackets 17.
  • Swingably mounted on each bracket 17 by means of a horizontal pivot pin 18 is a hydraulic ram or cylinder 19 having a piston rod 20 which is, in turn, provided at its forward end with a clevis 21.
  • links 26 pivoted upon the pivot pins 24 are links 26 provided with clevises 27 which, in turn, embrace the ends ofthe hydraulic cylinders 19 and are pivotally connected thereto by means of pivot pins 28 which are located forwardly of the pivot pins 18 (reference being made to Figure 1).
  • the clevises 21 of the piston rods 20 are pivotally mounted, by means of pivot pins 29, in brackets 30 welded to the derrick legs 25 as shown in Figure 1.
  • pivot pins 29, in brackets 30 welded to the derrick legs 25 as shown in Figure 1.
  • the pivot pin 24 is above, and rearwardly of, the pivot pin 22.
  • the pivot pin 18 is below the pivot pin 24, above the pivot pin 22, and forward of both such pivot pins.
  • the pivot pin 28 is forward of, and above, the pivot pin 22, but below the pivot pin 18. It is this unique arrangement of pivots that makes it possible for the derrick leg 25 to swing through an arc in excess of from the position shown in full lines to the position shown in dotted lines in Figure 1.
  • hydraulic cylinders 19 are of conventional construction and are, therefore, not described herein in specific detail.
  • the hydraulic cylinders 19 are connected through conventional hand-operated shut-off valves p and a main control valve V to a hydraulic system, substantially as shown in Figure 2.
  • the valve V may be of any conventional internal construction and includes a control handle lz, so that each of the two cylinders 19, 19, will be operated simultaneously.
  • the derrick legs 25 are parallel with each other and with the longitudinal axis of the body 1, and at their upper ends are rigidly fastened into elbow fittings f which, in turn, connect with converging top-legs 31, the latter being operably connected at their outer ends inwardly toward each other by sheave block assembly 32 having guide rollers 33.
  • the portable derrick is ordinarily lowered to inoperative or horizontal position as shown in Figure l and rests at its forward end in a somewhat L-shaped transport rack R rigidly carried on the forward wall of the truck body 1 and extending upwardly and forwardly over the drivers cab 2.
  • oil is admitted to the cylinders 19, pushing the piston rods outwardly and accordingly swinging the derrick upwardly and rearwardly. It will, of course, be understood that by manipulating the valve handle it different amounts of oil can be admitted to the cylinders 19, 19, so that the derrick can be caused to assume virtually any position of angulation within the maximum limits of travel permitted by the component elements thereof.
  • the cylinders 19, 19, can be adjusted so that the sheave block assembly 32 is located more or less vertically above the cargo area a in order that the cable 12 can be dropped vertically into the cargo area a for attachment to a heavy object, such as the transformer switch box or the like, whereupon the heavy article can be lifted vertically up from the floor of the truck and suspended.
  • a heavy object such as the transformer switch box or the like
  • the sheave block assembly 32 can be swung rearwardly over and beyond the rear end of the truck body 1, thereby transporting the suspended heavy article rearwardly beyond the truck body into the clear, from which latter position it can be lowered to the ground or raised up to pole-height.
  • the derrick A may be locked in the particular position to which it has been adjusted by closing the I hand shut-01f valves 12.
  • a modified form of portable derrick of the type shown in Figure 7 for use with a truck body 1 having spaced parallel side walls 3', 4'.
  • This modified form of derrick is substantially similar to the previously described portable derrick, which comprises two converging derrick legs connected at their upper ends by a sheave block assembly 3.2 having guide rollers 33, which elements are substantially similar to the previously described derrick legs 25, sheave block assembly 32, and guide rollers 33.
  • the derrick legs 25 are similarly mounted at their lower ends, by means of pivot pins 24, upon links 23, which are, in turn, pivoted upon brackets 16 by means of pivot pins 22.
  • brackets 34 which are cross-connected by a bar 35.
  • the derrick legs 25 are rigidly cross-connected by horizontal bar 36 which is located just below the elbow fitting j" and the pivot pins 24 are endwise connected by a horizontal bar 37.
  • Pivotally connected between the midpoints of the bars 35, 36, is a single hydraulic ram or cylinder 33 and similarly mounted on the bar 37 is a link 26' integrally provided at its forward end with a clevis 27 which straddles the lower end of the hydraulic cylinder 38 and is pivotally connected to the bar 35.
  • This modified form of portable derrick functions in exactly the same manner as the previously described structure and differs therefrom only in the utilization of the single hydraulic ram or cylinder 38. It will, of course, be understood in this connection that this modiried type of portable derrick must either be employed for lighter types of work or the single hydraulic cylinder 38 and the bars 35, 36, 37, must be of substantial size and strength. It will also be apparent that in the case of certain types of truck bodies the presence of the transversely extending bars 35, 36, 37, would impede the cargo area and work space within the truck body and, for such situations, it would be necessary to use a two ram boom rather than a single ram boom. These, of course, are matters of choice and selection which fall within the scope of the present invention.
  • This derrick comprises a single derrick leg 25" which is provided at its outer'end with a sheave block assembly 32" and at its lower end is pivotally mounted on a link 23" by means of a pivot pin 24".
  • the link 23" is, in turn, pivotally mounted, by means of a pivot pin 22", in a bracket 16".
  • the elements are substantially similar to the previously described elements 23, 24, 22, and 16, respectively.
  • the pivot pin 24" also engages a link 26" having a clevis 27" which straddles the lower end of, and is pivotally connected to, a hydraulic cylinder 19", the latter being, in turn, pivotally connected upon a bracket 17".
  • the hydraulic cylinder 19" is operatively provided with a piston rod 20 which is pivotally secured at its outer end to the derrick leg 25" by means of a pivot pin 29" which is mounted in a bracket 30".
  • This one legged single ram derrick also functions in substantially the same manner as the previously described two legged derricks.
  • a derrick comprising an approximately horizontal base, a boom pivotally mounted at its lower end upon a pair of divergent links, one of which is in turn pivotally mounted at its lower end upon the base, whereby the boom may be swung into various positions and being adapted, when in one extreme position, to extend forwardly over the base, and hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the link, said hydraulic cylinder means extending downwardly along the boom and having its lower end pivotally mounted on the base at a point forwardly from the lower end of the boom when the boom is in said extreme position, the other link being pivotally connected at its lower end to the lower end of the hydraulic cylinder means forwardly of the point of pivotal connection between said hydraulic cylinder means and the base so that said lower end of the boom will move along an arc upwardly and around the point of pivotal connection between the hydraulic cylinder means and the base.
  • a derrick comprising a base, a boom pivotally mounted at its lower end upon a pair of divergent links, one of which is in turn pivotally mounted at its lower end upon the base, whereby the boom may be swung into various positions and being adapted, when in one extreme position, to extend forwardly over the base, and hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the links, said hydraulic cylinder means extending downwardly along the boom and having its lower end pivotally mounted on the base forwardly from the lower end of the boom when the boom is in said extreme position, the other link being pivotally connected at its lower end to the lower end of the hydraulic cylinder means forwardly of the point of pivotal connection between said hydraulic cylinder means and the base, said other link extending forwardly and downwardly from the lower end of the boom so that said lower end of the boom will move along an arc upwardly and around the point of pivotal connection between the hydraulic cylinder means and the base.
  • a derrick comprising a base, first pivot means mounted on the base, second pivot means also mounted on the base in spaced relation to the first pivot means, first link means rockably mounted on the second pivot means and extending upwardly therefrom, a boom pivotally mounted at its lower end upon the first link means for swinging movement into various positions and being adapted, when in one extreme position, to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the first link means, said hydraulic cylinder means extending downwardly along the boom and being rockably mounted at its lower end upon the first pivot means, and second link means pivotally connected to the boom forwardly of the point of pivotal connection between the boom and first pivot means, said second link means extending upwardly and being rockably connected to the lower end of the boom so that said lower end of the boom will move along an arc upwardly and around the point of pivotal connection between the hydraulic cylinder and the first pivot means.
  • a derrick comprising a base, first pivot means mounted on the base, second pivot means also mounted on the base rearwardly in relation to the first pivot means, first link means rockably mounted on the second pivot means and extending upwardly therefrom, a boom pivotally mounted at its lower end upon the first link means for swinging movement into various positions and being adapted, when in one extreme position, to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the first link means, said hydraulic cylinder means extending downwardly along the boom and being rockably mounted at its lower end upon the first pivot means, and clevis means pivotally connected to the boom forwardly of the point of pivotal connection between the boom and first pivot means, said clevis means extending upwardly and being rockably connected to the lower end of the boom so that said lower end of the boom will move along an arc upwardly and around the point of pivotal connection between the hydraulic cylinder and the first pivot means.
  • a derrick comprising a base, first pivot means mounted on the base, second pivot means also mounted on the base rearwardly in relation to the first pivot means, first link means rockably mounted on the second pivot means and extending upwardly therefrom, a boom pivotally mounted at its lower end upon the first link means for swinging movement into various positions and being adapted, when in one extreme position, to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly there- 'along with respect to point of pivotal connection between the boom and the first link means, said hydraulic cylinder means extending downwardly along the boom and being rockably mounted at its lower end upon the first pivot means, and second link means pivotally connected to the boom forwardly of the point of pivotal connection between the boom and first pivot means, said second link means extending upwardly and being rockably connected to the lower end of the boom around the point of pivotal connection between the boom and the first link means so that said lower end of the boom will move along an are upwardly and around the point of pivotal connection between the hydraulic cylinder and
  • a derrick comprising a base, a pair of laterally aligned first pivots mounted on the base, a pair of laterally aligned second pivots also mounted on the base rearwardly of the first pivots, a first link rockably mounted on, and extending upwardly from, each of the second pivots, a boom having two converging legs connected at their upper ends for operatively supporting a sheave, said legs each respectively being pivotally mounted at its lower end upon one of the first links for swinging movement into various positions, whereby said boom, when in one extreme position, will extend forwardly over the base, a hydraulic cylinder pivotally connected at its upper end to each leg outwardly therealong with respect to point of pivotal connection between such leg and the first link, each of said hydraulic cylinders respectively extending downwardly along the leg with which it is associated and being pivotally connected to one of the first pivots forwardly of the point of pivotal connection betweeen such leg and the first link, and second links pivotally connected to the cylinder forwardly of the point of pivotal connection
  • a derrick comprising a base, a pair of laterally aligned first pivots mounted on the base, a pair of laterally aligned second pivots also mounted on the base rearwardly of the first pivots, a first link rockably mounted on, and extending upwardly from, each of the second pivots, a boom having two converging legs connected at their upper ends for operatively supporting a sheave, said legs each respectively being pivotally mounted at its lower end upon one of the first links for swinging movement into various positions, whereby said boom, when in one extreme position, will extend forwardly over the base, a hydraulic cylinder pivotally connected at its upper end to each leg outwardly therealong with respect to point of pivotal connection between such leg and the first link, each of said hydraulic cylinders respectively extending downwardly along the leg with which it is associated and being pivotally connected to one of the first pivots forwardly of the point of pivotal connection between such leg and the first link, and second links pivotally connected to the cylinder forwardly of the point of pivotal connection between such cylinder
  • a derrick comprising a base, a pair of laterally aligned first pivots mounted on the base, a pair of laterally aligned second pivots also mounted on the base rearwardly of the first pivots, a first link rockably mounted on, and extending upwardly from, each of the second pivots, a boom having two converging legs connected at their upper ends for operatively supporting a sheave, said legs each respectively being pivotally mounted at its lower end upon one of the first links for swinging movement into various positions, whereby said boom, when in one extreme position, will ext-end forwardly over the base, a hydraulic cylinder pivotally connected at its upper end to each leg outwardly therealong with respect to point of pivotal connection between such leg and the first link, each of said hydraulic cylinders respectively extending downwardly along the leg with which it is associated and being pivotally connected to one of the first pivots forwardly of the point of pivotal connection between such leg and the first link, and clevises pivotally connected to the cylinder forwardly of the point of pivot
  • a derrick comprising a base, a pair of laterally aligned first pivots mounted on the base, a pair of laterally aligned second pivots also mounted on the base rearwardly of the first pivots, and having its pivot-center below the pivot-center of the first pivot, 21 first link rockably mounted on, and extending upwardly from, each of the second pivots, a boom having two converging legs connected at their upper ends for operatively supporting a sheave, said legs each respectively being pivotally mounted at its lower end upon one of the first links for swinging movement into various positions, whereby said boom, when in one extreme position, will extend forwardly over the base, a hydraulic cylinder pivotally connected at its upper end to each leg outwardly therealong with respect to point of pivotal connection between such leg and the first link, each of said hydraulic cylinders respectively extending downwardly along the leg with which it is associated and being pivotally connected to one of the first pivots forwardly of the point of pivotal connection between such leg and the first link, and second links pivotally connected to the
  • a derrick comprising a base, a pair of laterally aligned first pivots mounted on the base, a pair of laterally aligned second pivots also mounted on the base rearwardly of the first pivots, said second pivots being located below the first pivots, a first link rockably mounted on, and extending upwardly from, each of the second pivots, a boom having two converging legs connected at their upper ends for operatively supporting a sheave, said legs each respectively being pivotally mounted at its lower end upon one of the first links for swinging movement into various positions, whereby said boom, when in one extreme position, will extend forwardly over the base, a hydraulic cylinder pivotally connected at its upper end to each leg outwardly therealong with respect to point of pivotal connection between such leg and the first link, each of saidhydraulic cylinders respectively extending downwardly along the leg with which it is associated and being pivotally connected to one of the first pivots forwardly of the point of pivotal connection between such leg and the first link, and second links pivotally connected to the
  • a derrick comprising a base, a pair of laterally aiigned support members mounted on the base, a pair of laterally aligned pivots also mounted on the base rearwnrdly or the support means, a first cross-bar mounted at its ends in and extending between the support members, first links pivotally mounted at their lower ends respectively upon the pivots, a boom having two converging legs connected at their upper ends for operatively supporting sheave, said legs each being respectively pivotally mounted at its lower end upon one of the links for swinging movement into various positions, whereby said boom, when in one extreme position, will extend over the base, a second cross-bar extending iorwa transversely between said legs outwardly therealong with respect to point of pivotal connection between the legs and the first links, hydraulic cylinder means pivotally connected at its lower end to said first cross-bar, said hydraulic cylinder means extending between the legs and having its lower end pivotally connected to the second cross-bar, each leg being provided with a second link pivotally connected thereto at
  • a derrick comprising a base, a pair of laterally aligned support members mounted on the base, a pair of laterally aligned pivots also mounted on the base downwardly and rearwardly of the support means, a first crossbar mounted at its ends in and extending between the support members, first links pivotally mounted at their lower ends respectively upon the pivots, a boom having two converging legs connected at their upper ends for operatively supporting a sheave, said legs each being respectively pivotally mounted at its lower end upon one of the links for swinging movement into various positions, whereby said boom, when in one extreme position, will extend forwardly over the base, a second crossbar extending transversely between said legs outwardly therealong with respect to point of pivotal connection between the legs and the first links, hydraulic cylinder means pivotally connected at its lower end to said first crossbar, said hydraulic cylinder means extending between the legs and having its lower end pivotally connected to the second cross-bar, each leg being provided with a second link pivotally connected thereto at the point of pivotal connection between such
  • a derrick comprising a base, a pair of laterally aligned support members mounted on the base, a pair of laterally aligned pivots also mounted on the base rearwardly of the support means, a first cross-bar mounted at its ends in and extending between the support members, first links pivotally mounted at their lower ends respectively upon the pivots, a boom having two converging legs connected at their upper ends for operatively supporting a sheave, said legs each being respectively pivotally mounted at its lower end upon one of the links above the first cross-bar for swinging movement into various positions, whereby said boom when in one extreme position, will extend forwardly over the base, a second cross-bar extending transversely between said legs outwardly therealong with respect to point of pivotal connection between the legs and the first links, hydraulic cylinder means pivotally connected at its lower end to said first cross-bar, said hydraulic cylinder means extending between the legs and having its lower end pivotally connected to the second cross-bar, each leg being provided with a second link pivotally connected thereto at the
  • a derrick comprising a base, a first link pivotally mounted on, and extending upwardly from, the base, a single-leg boom pivotally mounted at its lower end upon the upper end of the first link for swinging movement into various positions and being adapted, when in one extreme position, to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the first link, said hydraulic cylinder means extending downwardly along the boom and being pivotally connected at its lower end to the base forwardly with respect to the lower end of the boom when the boom is in said extreme position, and a second link pivotally connected to the boom at the point of pivotal connection between the boom and the first link, said second link being pivotally connected to the hydraulic cylinder means forwardly of the point of pivotal connection between the hydraulic cylinder means and the base, said links, furthermore, being pivoted to the boom and base respectively on opposite sides of the point at which the boom is pivoted to the base, said first and second links extending forwardly
  • a derrick comprising a base, a first link pivotally mounted on, and extending upwardly from, the base, a single-leg boom pivotally mounted at its lower end upon the upper end of the first link for swinging movement into various positions and being adapted, when in one extreme position, to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the first link, said hydraulic cylinder means extending downwardly along the boom and being pivotally connected at its lower end to the base forwardly with respect to the lower end of the boom when the boom is in said extreme position, and a second link pivotally connected to the boom at the point of pivotal connection between the boom and the first link, said second link being pivotally connected to the hydraulic cylinder means forwardly of the point of pivotal connection between the hydraulic cylinder means and the base and below the point at which the first link is pivoted to the boom, said links, furthermore, being pivoted to the boom and base respectively on opposite sides of the point at which the boom is
  • a derrick comprising a base, pivot means mounted on the base, link means rockably mounted on the pivot means, a boom pivotally mounted at its lower end upon the link means, hydraulic cylinder means pivotally mounted at its upper end to the boom and at its lower end to the base, and means operatively connecting said link to the base-pivoted end of the hydraulic cylinder means for swinging the link away from the base around the point at which the link is pivoted to the base so as to produce movement between the pivotal connection of the link and the lower end of the boom responsive to swing ing movement of the base-pivoted end of the hydraulic cylinder means.
  • a derrick comprising a base, pivot means mounted on the base, link means swingably mounted on the pivot means, a boom swingably mounted at its lower end upon the link means for swinging movement into various positions and being adapted when in one extreme position to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to the point of pivotal connection between the boom and said link means, said hydraulic cylinder means extending downwardly along the boom and having its lower end spaced forwardly from the lower end of the boom when the boom is in said extreme position, said hydraulic cylinder means being pivotally connected to the base at such lower end, and means operatively connecting said link and the lower end of the hydraulic cylinder means so that as the boom and hydraulic cylinder means swing upwardly from said extreme position the link will also be swung around the point at which said link is pivoted to the base so as to produce corresponding movement of the pivotal connection between the link and the lower end of the boom.
  • a derrick comprising a base, a link pivotally mounted at its lower end upon the base, a boom pivotally connected at its lower end to the link for swinging movement into various positions and being adapted when in one extreme position to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the link, said hydraulic cylinder means extending downwardly along the boom and having its lower end pivotally mounted on the base forwardly from the lower end of the boom when the boom is in said extreme position, a connecting element mounted adjacent to the lower end of the hydraulic cylinder means and also being operatively connected to the link whereby to cause said link to rotate about its pivotal connection with the base as the boom swings out of said extreme position and away from the base so that the point of pivotal connection between the lower end of the boom and said link will move away from the base responsive to movement of the hydraulic cylinder means.
  • a derrick comprising a base, a link pivotally mounted on the base, a boom pivotally mounted at its lower end upon the link for swinging movement into various positions and being adapted when in one extreme position to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the link, said hydraulic cylinder means extending downwardly along the boom and having its lower end pivotally connected to the base forwardly from the lower end of the boom when the boom is in said extreme position, a connecting element mounted on the lower end of the hydraulic cylinder means, and means operatively associated with said connecting element and the link whereby to cause said link to rotate about its pivotal connection with the base as the boom swings out of said extreme position and away from the base so that the point of pivotal connection between the lower end of the boom and said link will move away from the base in the same direction as the boom.

Description

March 26, 1957 R. o. BALOGH 2,786,531
PORTABLE DERRICKS Original Filed June 10, 1955 5 SheetS -Sheet 1 INVENTOR.
ROY o. BALOGH f m MMzt ft ATTORNEY March 26, 1957 O, BALOGH 2,786,581
PORTABLE DERRICKS Original Filed June 10; 1955 5 Sheets-Sheet 2 INVENTOR.
ROY O. BALOGH ATTORNEY March 1957 R. o. BALOGH PORTABLE DERRICKS 3 Sheets-Sheet 3 Original Filed June 10, 1955 u lm IN V EN TOR.
ROY O. BALOGH United States Patent PORTABLE DERRICKS Roy 0. Balogh, Clayton, Mo., assignor to McCabe-Powers Auto Body Co., St. Louis, Mo., a corporation of Missoun Contilguation of application Serial No. 514,462, June 10,
19 Claims. (Cl. 212-8) This invention relates in general to certain new and useful improvements in portable derricks and, more particularly, to a vehicle-mounted derrick adapted for movement from a horizontal or so-called transport position to various upright or work positions through an arc in excess of 180. This application is a continuation of my copending application Serial No. 514,462, filed June 10, 1955.
Service and maintenance trucks employed by public utilities and similar companies are ordinarily provided with some type of derrick which can be used in lifting equipment up and down, setting poles, removing worn out or defective poles and replacing them, and similar types of work. Such derricks are usually pivoted near the rear end of the truck body and extend forwardly in a substantially horizontal position over the top of the body when the truck is moving from place to place. This position is usually referred to as the transport position. For actual use, the derrick is elevated into various upwardly and rearwardly inclined positions usually referred to as work positions. However, many types of work encountered in the field, such as the lifting of heavy equipment from the truck body to the ground and then elevating it to the pole, necessitates swinging the derrick downward-1y over the rear end of the truck to a rearwardly extending horizontal position or even, in some cases, a rearwardly and downwardly inclined position. Thus, the derrick must swing through an arc in excess of 180 during these work-operations. Considerable difficulty in this respect is encountered with conventional types of portable deiricks by reason of the fact that conventional derricks cannot swing more than 180 and, in fact, many conventional derricks have an even more limited arc of movement.
It is, therefore, the primary object of the present invention to provide a power operated vehicle-mounted or portable derrick which can be swung from inoperative transport position to upright or work-position quickly, efficiently, and is capable of swinging through an are substantially greater than 180.
It is also an object of the present invention to provide a vehicle-mounted derrick of the type stated which, when in operative position, can be swung forwardly and rearwardly by power driven means and is thus capable of reaching various desired positions outwardly and downwardly to the rear of the truck body on which it is mounted.
it is a further object of the present invention to provide a portable derrick of the type stated which can be manipulated to and from transport position and into various operative positions by a single operator and is capable of a wider range of movement than conventional types of portable derricks.
With the above and other objects in view, my invention resides in the novel features of form, construction, arrangement, and combination of parts presently described and pointed out in the claims.
This application May 7, 1956, Serial No.
Patented Mar. 26, 1957 In the accompanying drawings (three sheets) Figure 1 is a side elevational view of a utility maintenance truck equipped with a portable derrick constructed in accordance with and embodying the present invention;
Figure 2 is a diagrammatic view of the hydraulic system forming a part of the present invention;
Figure 3 is a fragmentary top plan view of the utility maintenance truck equipped with a portable derrick constructed in accordance with and embodying the present invention;
Figure 4 is a fragmentary side elevational view showing the derrick in upright or work-position;
Figures 5 and 6 are fragmentary sectional views taken along lines 55 and 6--6, respectively of Figure 1;
Figure 7 is a fragmentary perspective view of a modified form of portable derrick constructed in accordance with and embodying the present invention; and
Figure 8 is a fragmentary perspective view of a further modified form of portable derrick constructed in accordance with and embodying the present invention.
Referring now in more detail and by reference characters to the drawings, which illustrate practical embodiments of the present invention, A designates a utility maintenance truck equipped with a so-called utility body 1 provided at its forward end with the drivers cab 2 and having rearwardly extending side walls 3, 4, disposed in spaced parellel relation and including a series of built-in cabinets 5, 6, '7, 8, for the storage of tools, small parts, and similar items of equipment ordinarily used by repair crews. The side walls 3, 4, are spaced outwardly from each other and, together with the rear wall 9 of the cab compartment, define a cargo area a which is open at the top and rear. Mounted on the floor 10 adjacent to the crew compartment 2 is a conventional cable winch assembly 11 having a cable 12.
The floor 10 is extended rearwardly beyond the rear vertical faces of the side walls 3, 4, in the provision of an extension 13 provided on its under face with depending clevis-brackets 14 from which ground jacks 15 are suspended. Welded upon the rear faces of the side walls 3, 4, adjacent the upper ends thereof, are horizontally aligned brackets 16 and similarly welded on the upper faces of the side walls 3, 4, forwardly with respect to the brackets 16, are horizontally aligned auxiliary brackets 17. Swingably mounted on each bracket 17 by means of a horizontal pivot pin 18 is a hydraulic ram or cylinder 19 having a piston rod 20 which is, in turn, provided at its forward end with a clevis 21.
V Swingably mounted on each bracket 16 by means of horizontal pivot pins 22 are links 23 which are pivotally connected at their other ends by means of pivot pins 24 to the lower ends of derrick legs 25.
Also pivoted upon the pivot pins 24 are links 26 provided with clevises 27 which, in turn, embrace the ends ofthe hydraulic cylinders 19 and are pivotally connected thereto by means of pivot pins 28 which are located forwardly of the pivot pins 18 (reference being made to Figure 1).
The clevises 21 of the piston rods 20 are pivotally mounted, by means of pivot pins 29, in brackets 30 welded to the derrick legs 25 as shown in Figure 1. By reference to Figure 1, it will be noted that when the derrick is in transport position the pivot pin 24 is above, and rearwardly of, the pivot pin 22. Similarly, the pivot pin 18 is below the pivot pin 24, above the pivot pin 22, and forward of both such pivot pins. Furthermore, the pivot pin 28 is forward of, and above, the pivot pin 22, but below the pivot pin 18. It is this unique arrangement of pivots that makes it possible for the derrick leg 25 to swing through an arc in excess of from the position shown in full lines to the position shown in dotted lines in Figure 1. It also should be noted that the hydraulic cylinders 19 are of conventional construction and are, therefore, not described herein in specific detail. The hydraulic cylinders 19 are connected through conventional hand-operated shut-off valves p and a main control valve V to a hydraulic system, substantially as shown in Figure 2. The valve V may be of any conventional internal construction and includes a control handle lz, so that each of the two cylinders 19, 19, will be operated simultaneously.
The derrick legs 25 are parallel with each other and with the longitudinal axis of the body 1, and at their upper ends are rigidly fastened into elbow fittings f which, in turn, connect with converging top-legs 31, the latter being operably connected at their outer ends inwardly toward each other by sheave block assembly 32 having guide rollers 33.
The portable derrick is ordinarily lowered to inoperative or horizontal position as shown in Figure l and rests at its forward end in a somewhat L-shaped transport rack R rigidly carried on the forward wall of the truck body 1 and extending upwardly and forwardly over the drivers cab 2. in order to raise the derrick to the operative position shown in Figure 4, oil is admitted to the cylinders 19, pushing the piston rods outwardly and accordingly swinging the derrick upwardly and rearwardly. It will, of course, be understood that by manipulating the valve handle it different amounts of oil can be admitted to the cylinders 19, 19, so that the derrick can be caused to assume virtually any position of angulation within the maximum limits of travel permitted by the component elements thereof. For example, the cylinders 19, 19, can be adjusted so that the sheave block assembly 32 is located more or less vertically above the cargo area a in order that the cable 12 can be dropped vertically into the cargo area a for attachment to a heavy object, such as the transformer switch box or the like, whereupon the heavy article can be lifted vertically up from the floor of the truck and suspended. Thereupon, by admitting further oil into the cylinders 15%, 19, the sheave block assembly 32 can be swung rearwardly over and beyond the rear end of the truck body 1, thereby transporting the suspended heavy article rearwardly beyond the truck body into the clear, from which latter position it can be lowered to the ground or raised up to pole-height. When a heavy object such as a transformer is being lifted by the cable 12, the derrick A may be locked in the particular position to which it has been adjusted by closing the I hand shut-01f valves 12.
it is also possible to provide a modified form of portable derrick of the type shown in Figure 7 for use with a truck body 1 having spaced parallel side walls 3', 4'. This modified form of derrick is substantially similar to the previously described portable derrick, which comprises two converging derrick legs connected at their upper ends by a sheave block assembly 3.2 having guide rollers 33, which elements are substantially similar to the previously described derrick legs 25, sheave block assembly 32, and guide rollers 33. The derrick legs 25 are similarly mounted at their lower ends, by means of pivot pins 24, upon links 23, which are, in turn, pivoted upon brackets 16 by means of pivot pins 22.
Welded upon the side walls 3', 4, of the body 1' are brackets 34 which are cross-connected by a bar 35. Similarly, the derrick legs 25 are rigidly cross-connected by horizontal bar 36 which is located just below the elbow fitting j" and the pivot pins 24 are endwise connected by a horizontal bar 37. Pivotally connected between the midpoints of the bars 35, 36, is a single hydraulic ram or cylinder 33 and similarly mounted on the bar 37 is a link 26' integrally provided at its forward end with a clevis 27 which straddles the lower end of the hydraulic cylinder 38 and is pivotally connected to the bar 35.
This modified form of portable derrick functions in exactly the same manner as the previously described structure and differs therefrom only in the utilization of the single hydraulic ram or cylinder 38. It will, of course, be understood in this connection that this modiried type of portable derrick must either be employed for lighter types of work or the single hydraulic cylinder 38 and the bars 35, 36, 37, must be of substantial size and strength. It will also be apparent that in the case of certain types of truck bodies the presence of the transversely extending bars 35, 36, 37, would impede the cargo area and work space within the truck body and, for such situations, it would be necessary to use a two ram boom rather than a single ram boom. These, of course, are matters of choice and selection which fall within the scope of the present invention.
Finally, it is also possible to provide a single legged one ram derrick embodying the present invention as shown in Figure 8. This derrick comprises a single derrick leg 25" which is provided at its outer'end with a sheave block assembly 32" and at its lower end is pivotally mounted on a link 23" by means of a pivot pin 24". The link 23" is, in turn, pivotally mounted, by means of a pivot pin 22", in a bracket 16". The elements are substantially similar to the previously described elements 23, 24, 22, and 16, respectively. The pivot pin 24" also engages a link 26" having a clevis 27" which straddles the lower end of, and is pivotally connected to, a hydraulic cylinder 19", the latter being, in turn, pivotally connected upon a bracket 17". The hydraulic cylinder 19" is operatively provided with a piston rod 20 which is pivotally secured at its outer end to the derrick leg 25" by means of a pivot pin 29" which is mounted in a bracket 30". This one legged single ram derrick also functions in substantially the same manner as the previously described two legged derricks.
It should'be understood that changes and modifications in the form, construction, arrangement, and combination of the several parts of the portable derrick may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.
I claim:
1. A derrick comprising an approximately horizontal base, a boom pivotally mounted at its lower end upon a pair of divergent links, one of which is in turn pivotally mounted at its lower end upon the base, whereby the boom may be swung into various positions and being adapted, when in one extreme position, to extend forwardly over the base, and hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the link, said hydraulic cylinder means extending downwardly along the boom and having its lower end pivotally mounted on the base at a point forwardly from the lower end of the boom when the boom is in said extreme position, the other link being pivotally connected at its lower end to the lower end of the hydraulic cylinder means forwardly of the point of pivotal connection between said hydraulic cylinder means and the base so that said lower end of the boom will move along an arc upwardly and around the point of pivotal connection between the hydraulic cylinder means and the base.
2. A derrick comprising a base, a boom pivotally mounted at its lower end upon a pair of divergent links, one of which is in turn pivotally mounted at its lower end upon the base, whereby the boom may be swung into various positions and being adapted, when in one extreme position, to extend forwardly over the base, and hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the links, said hydraulic cylinder means extending downwardly along the boom and having its lower end pivotally mounted on the base forwardly from the lower end of the boom when the boom is in said extreme position, the other link being pivotally connected at its lower end to the lower end of the hydraulic cylinder means forwardly of the point of pivotal connection between said hydraulic cylinder means and the base, said other link extending forwardly and downwardly from the lower end of the boom so that said lower end of the boom will move along an arc upwardly and around the point of pivotal connection between the hydraulic cylinder means and the base.
3. A derrick comprising a base, first pivot means mounted on the base, second pivot means also mounted on the base in spaced relation to the first pivot means, first link means rockably mounted on the second pivot means and extending upwardly therefrom, a boom pivotally mounted at its lower end upon the first link means for swinging movement into various positions and being adapted, when in one extreme position, to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the first link means, said hydraulic cylinder means extending downwardly along the boom and being rockably mounted at its lower end upon the first pivot means, and second link means pivotally connected to the boom forwardly of the point of pivotal connection between the boom and first pivot means, said second link means extending upwardly and being rockably connected to the lower end of the boom so that said lower end of the boom will move along an arc upwardly and around the point of pivotal connection between the hydraulic cylinder and the first pivot means.
4. A derrick comprising a base, first pivot means mounted on the base, second pivot means also mounted on the base rearwardly in relation to the first pivot means, first link means rockably mounted on the second pivot means and extending upwardly therefrom, a boom pivotally mounted at its lower end upon the first link means for swinging movement into various positions and being adapted, when in one extreme position, to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the first link means, said hydraulic cylinder means extending downwardly along the boom and being rockably mounted at its lower end upon the first pivot means, and clevis means pivotally connected to the boom forwardly of the point of pivotal connection between the boom and first pivot means, said clevis means extending upwardly and being rockably connected to the lower end of the boom so that said lower end of the boom will move along an arc upwardly and around the point of pivotal connection between the hydraulic cylinder and the first pivot means.
5. A derrick comprising a base, first pivot means mounted on the base, second pivot means also mounted on the base rearwardly in relation to the first pivot means, first link means rockably mounted on the second pivot means and extending upwardly therefrom, a boom pivotally mounted at its lower end upon the first link means for swinging movement into various positions and being adapted, when in one extreme position, to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly there- 'along with respect to point of pivotal connection between the boom and the first link means, said hydraulic cylinder means extending downwardly along the boom and being rockably mounted at its lower end upon the first pivot means, and second link means pivotally connected to the boom forwardly of the point of pivotal connection between the boom and first pivot means, said second link means extending upwardly and being rockably connected to the lower end of the boom around the point of pivotal connection between the boom and the first link means so that said lower end of the boom will move along an are upwardly and around the point of pivotal connection between the hydraulic cylinder and the first pivot means.
6. A derrick comprising a base, a pair of laterally aligned first pivots mounted on the base, a pair of laterally aligned second pivots also mounted on the base rearwardly of the first pivots, a first link rockably mounted on, and extending upwardly from, each of the second pivots, a boom having two converging legs connected at their upper ends for operatively supporting a sheave, said legs each respectively being pivotally mounted at its lower end upon one of the first links for swinging movement into various positions, whereby said boom, when in one extreme position, will extend forwardly over the base, a hydraulic cylinder pivotally connected at its upper end to each leg outwardly therealong with respect to point of pivotal connection between such leg and the first link, each of said hydraulic cylinders respectively extending downwardly along the leg with which it is associated and being pivotally connected to one of the first pivots forwardly of the point of pivotal connection betweeen such leg and the first link, and second links pivotally connected to the cylinder forwardly of the point of pivotal connection between such cylinder and the first pivot, said second link extending rearwardly and being pivotally connected to the lower end of the leg and to the first link by a common pivot so that said lower end of such legs will move along an arc upwardly and around first pivots.
7. A derrick comprising a base, a pair of laterally aligned first pivots mounted on the base, a pair of laterally aligned second pivots also mounted on the base rearwardly of the first pivots, a first link rockably mounted on, and extending upwardly from, each of the second pivots, a boom having two converging legs connected at their upper ends for operatively supporting a sheave, said legs each respectively being pivotally mounted at its lower end upon one of the first links for swinging movement into various positions, whereby said boom, when in one extreme position, will extend forwardly over the base, a hydraulic cylinder pivotally connected at its upper end to each leg outwardly therealong with respect to point of pivotal connection between such leg and the first link, each of said hydraulic cylinders respectively extending downwardly along the leg with which it is associated and being pivotally connected to one of the first pivots forwardly of the point of pivotal connection between such leg and the first link, and second links pivotally connected to the cylinder forwardly of the point of pivotal connection between such cylinder and the first pivot, said second link extending upwardly and rearwardly to converge with the first link and being pivotally connected to the lower end of the leg and to the first link by a common pivot so that said lower end of such legs will move along an arc upwardly and around first pivots.
8. A derrick comprising a base, a pair of laterally aligned first pivots mounted on the base, a pair of laterally aligned second pivots also mounted on the base rearwardly of the first pivots, a first link rockably mounted on, and extending upwardly from, each of the second pivots, a boom having two converging legs connected at their upper ends for operatively supporting a sheave, said legs each respectively being pivotally mounted at its lower end upon one of the first links for swinging movement into various positions, whereby said boom, when in one extreme position, will ext-end forwardly over the base, a hydraulic cylinder pivotally connected at its upper end to each leg outwardly therealong with respect to point of pivotal connection between such leg and the first link, each of said hydraulic cylinders respectively extending downwardly along the leg with which it is associated and being pivotally connected to one of the first pivots forwardly of the point of pivotal connection between such leg and the first link, and clevises pivotally connected to the cylinder forwardly of the point of pivotal connection between such cylinder and the first pivot, said clevises 7 extending rearwardly and being pivotally connected to the lower end of the leg and to the first link by a common pivot so that said lower end of such legs will move along an arc upwardly and around first pivots.
9. A derrick comprising a base, a pair of laterally aligned first pivots mounted on the base, a pair of laterally aligned second pivots also mounted on the base rearwardly of the first pivots, and having its pivot-center below the pivot-center of the first pivot, 21 first link rockably mounted on, and extending upwardly from, each of the second pivots, a boom having two converging legs connected at their upper ends for operatively supporting a sheave, said legs each respectively being pivotally mounted at its lower end upon one of the first links for swinging movement into various positions, whereby said boom, when in one extreme position, will extend forwardly over the base, a hydraulic cylinder pivotally connected at its upper end to each leg outwardly therealong with respect to point of pivotal connection between such leg and the first link, each of said hydraulic cylinders respectively extending downwardly along the leg with which it is associated and being pivotally connected to one of the first pivots forwardly of the point of pivotal connection between such leg and the first link, and second links pivotally connected to the cylinder forwardly of the point of pivotal connection between such cylinder and the first pivot, said second link extending rearwardly and being pivotally connected to the lower end of the leg and to the first link by a common pivot so that said lower end of such legs will move along an arc upwardly and around first pivots. I
10. A derrick comprising a base, a pair of laterally aligned first pivots mounted on the base, a pair of laterally aligned second pivots also mounted on the base rearwardly of the first pivots, said second pivots being located below the first pivots, a first link rockably mounted on, and extending upwardly from, each of the second pivots, a boom having two converging legs connected at their upper ends for operatively supporting a sheave, said legs each respectively being pivotally mounted at its lower end upon one of the first links for swinging movement into various positions, whereby said boom, when in one extreme position, will extend forwardly over the base, a hydraulic cylinder pivotally connected at its upper end to each leg outwardly therealong with respect to point of pivotal connection between such leg and the first link, each of saidhydraulic cylinders respectively extending downwardly along the leg with which it is associated and being pivotally connected to one of the first pivots forwardly of the point of pivotal connection between such leg and the first link, and second links pivotally connected to the cylinder forwardly of the point of pivotal connection between such cylinder and the first pivot, said second link extending rearwardly and being pivotally connected to the lower end of the leg and to the first link by a common pivot so that said lower end of such legs will move along an arc upwardly and around first pivots.
ll. A derrick comprising a base, a pair of laterally aiigned support members mounted on the base, a pair of laterally aligned pivots also mounted on the base rearwnrdly or the support means, a first cross-bar mounted at its ends in and extending between the support members, first links pivotally mounted at their lower ends respectively upon the pivots, a boom having two converging legs connected at their upper ends for operatively supporting sheave, said legs each being respectively pivotally mounted at its lower end upon one of the links for swinging movement into various positions, whereby said boom, when in one extreme position, will extend over the base, a second cross-bar extending iorwa transversely between said legs outwardly therealong with respect to point of pivotal connection between the legs and the first links, hydraulic cylinder means pivotally connected at its lower end to said first cross-bar, said hydraulic cylinder means extending between the legs and having its lower end pivotally connected to the second cross-bar, each leg being provided with a second link pivotally connected thereto at the point of pivotal connection between such leg and the first links, and a third cross-bar extending transversely between said second links and being pivotally connected to the hydraulic cylinder means above the lower end thereof so that said lower end of the hydraulic cylinder means will move along an arc upwardly and around the points of pivotal connection between the first links and the base.
12. A derrick comprising a base, a pair of laterally aligned support members mounted on the base, a pair of laterally aligned pivots also mounted on the base downwardly and rearwardly of the support means, a first crossbar mounted at its ends in and extending between the support members, first links pivotally mounted at their lower ends respectively upon the pivots, a boom having two converging legs connected at their upper ends for operatively supporting a sheave, said legs each being respectively pivotally mounted at its lower end upon one of the links for swinging movement into various positions, whereby said boom, when in one extreme position, will extend forwardly over the base, a second crossbar extending transversely between said legs outwardly therealong with respect to point of pivotal connection between the legs and the first links, hydraulic cylinder means pivotally connected at its lower end to said first crossbar, said hydraulic cylinder means extending between the legs and having its lower end pivotally connected to the second cross-bar, each leg being provided with a second link pivotally connected thereto at the point of pivotal connection between such leg and the first links, and a third cross-bar extending transversely between said second links and being pivotally connected to the hydraulic cylinder means above the lower end thereof so that said lower end of the hydraulic cylinder means will move along an arc upwardly and around the points of pivotal connection between the first links and the base.
13-. A derrick comprising a base, a pair of laterally aligned support members mounted on the base, a pair of laterally aligned pivots also mounted on the base rearwardly of the support means, a first cross-bar mounted at its ends in and extending between the support members, first links pivotally mounted at their lower ends respectively upon the pivots, a boom having two converging legs connected at their upper ends for operatively supporting a sheave, said legs each being respectively pivotally mounted at its lower end upon one of the links above the first cross-bar for swinging movement into various positions, whereby said boom when in one extreme position, will extend forwardly over the base, a second cross-bar extending transversely between said legs outwardly therealong with respect to point of pivotal connection between the legs and the first links, hydraulic cylinder means pivotally connected at its lower end to said first cross-bar, said hydraulic cylinder means extending between the legs and having its lower end pivotally connected to the second cross-bar, each leg being provided with a second link pivotally connected thereto at the point of pivotal connection between such leg and the first links, and a third cross-bar extending transversely between said second links and being pivotally connected to the hydraulic cylinder means above the lower end thereof so that said lower end of the hydraulic cylinder means will move along an arc upwardly and around the points of pivotal connection between the first links and the base.
14. A derrick comprising a base, a first link pivotally mounted on, and extending upwardly from, the base, a single-leg boom pivotally mounted at its lower end upon the upper end of the first link for swinging movement into various positions and being adapted, when in one extreme position, to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the first link, said hydraulic cylinder means extending downwardly along the boom and being pivotally connected at its lower end to the base forwardly with respect to the lower end of the boom when the boom is in said extreme position, and a second link pivotally connected to the boom at the point of pivotal connection between the boom and the first link, said second link being pivotally connected to the hydraulic cylinder means forwardly of the point of pivotal connection between the hydraulic cylinder means and the base, said links, furthermore, being pivoted to the boom and base respectively on opposite sides of the point at which the boom is pivoted to the base, said first and second links extending forwardly and being pivotally connected to each other and to the lower end of the hydraulic cylinder means so that said lower end of the hydraulic cylinder means will move along an arc upwardly and around the point of pivotal connection between the boom and the base.
15. A derrick comprising a base, a first link pivotally mounted on, and extending upwardly from, the base, a single-leg boom pivotally mounted at its lower end upon the upper end of the first link for swinging movement into various positions and being adapted, when in one extreme position, to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the first link, said hydraulic cylinder means extending downwardly along the boom and being pivotally connected at its lower end to the base forwardly with respect to the lower end of the boom when the boom is in said extreme position, and a second link pivotally connected to the boom at the point of pivotal connection between the boom and the first link, said second link being pivotally connected to the hydraulic cylinder means forwardly of the point of pivotal connection between the hydraulic cylinder means and the base and below the point at which the first link is pivoted to the boom, said links, furthermore, being pivoted to the boom and base respectively on opposite sides of the point at which the boom is pivoted to the base, said first and second links extending forwardly and being pivotally connected to each other and to the lower end of the hydraulic cylinder means so that said lower end of the hydraulic cylinder means will move along an arc upwardly and around the point of pivotal connection between the boom and the base.
16. A derrick comprising a base, pivot means mounted on the base, link means rockably mounted on the pivot means, a boom pivotally mounted at its lower end upon the link means, hydraulic cylinder means pivotally mounted at its upper end to the boom and at its lower end to the base, and means operatively connecting said link to the base-pivoted end of the hydraulic cylinder means for swinging the link away from the base around the point at which the link is pivoted to the base so as to produce movement between the pivotal connection of the link and the lower end of the boom responsive to swing ing movement of the base-pivoted end of the hydraulic cylinder means.
17. A derrick comprising a base, pivot means mounted on the base, link means swingably mounted on the pivot means, a boom swingably mounted at its lower end upon the link means for swinging movement into various positions and being adapted when in one extreme position to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to the point of pivotal connection between the boom and said link means, said hydraulic cylinder means extending downwardly along the boom and having its lower end spaced forwardly from the lower end of the boom when the boom is in said extreme position, said hydraulic cylinder means being pivotally connected to the base at such lower end, and means operatively connecting said link and the lower end of the hydraulic cylinder means so that as the boom and hydraulic cylinder means swing upwardly from said extreme position the link will also be swung around the point at which said link is pivoted to the base so as to produce corresponding movement of the pivotal connection between the link and the lower end of the boom.
18. A derrick comprising a base, a link pivotally mounted at its lower end upon the base, a boom pivotally connected at its lower end to the link for swinging movement into various positions and being adapted when in one extreme position to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the link, said hydraulic cylinder means extending downwardly along the boom and having its lower end pivotally mounted on the base forwardly from the lower end of the boom when the boom is in said extreme position, a connecting element mounted adjacent to the lower end of the hydraulic cylinder means and also being operatively connected to the link whereby to cause said link to rotate about its pivotal connection with the base as the boom swings out of said extreme position and away from the base so that the point of pivotal connection between the lower end of the boom and said link will move away from the base responsive to movement of the hydraulic cylinder means.
19. A derrick comprising a base, a link pivotally mounted on the base, a boom pivotally mounted at its lower end upon the link for swinging movement into various positions and being adapted when in one extreme position to extend forwardly over the base, hydraulic cylinder means pivotally connected at its upper end to the boom outwardly therealong with respect to point of pivotal connection between the boom and the link, said hydraulic cylinder means extending downwardly along the boom and having its lower end pivotally connected to the base forwardly from the lower end of the boom when the boom is in said extreme position, a connecting element mounted on the lower end of the hydraulic cylinder means, and means operatively associated with said connecting element and the link whereby to cause said link to rotate about its pivotal connection with the base as the boom swings out of said extreme position and away from the base so that the point of pivotal connection between the lower end of the boom and said link will move away from the base in the same direction as the boom.
No references cited.
US583322A 1956-05-07 1956-05-07 Portable derricks Expired - Lifetime US2786581A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US583322A US2786581A (en) 1956-05-07 1956-05-07 Portable derricks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US583322A US2786581A (en) 1956-05-07 1956-05-07 Portable derricks

Publications (1)

Publication Number Publication Date
US2786581A true US2786581A (en) 1957-03-26

Family

ID=24332622

Family Applications (1)

Application Number Title Priority Date Filing Date
US583322A Expired - Lifetime US2786581A (en) 1956-05-07 1956-05-07 Portable derricks

Country Status (1)

Country Link
US (1) US2786581A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2888149A (en) * 1956-09-25 1959-05-26 J H Holan Corp Derricks
US2897979A (en) * 1957-09-23 1959-08-04 J H Holan Corp Portable boom
US2980263A (en) * 1959-10-16 1961-04-18 Holan Corp Derrick
US3024916A (en) * 1956-07-16 1962-03-13 Edward V Garnett Vehicle derrick
US3071255A (en) * 1960-06-27 1963-01-01 Theodore R Bill Derricks
US3096886A (en) * 1960-04-07 1963-07-09 Mccabe Powers Body Company Single-boom derricks
US3121499A (en) * 1960-10-07 1964-02-18 Curtiss Wright Corp Aircraft propeller handling unit
US3146893A (en) * 1960-03-16 1964-09-01 Ohio Brass Co Derrick
US3154198A (en) * 1960-04-04 1964-10-27 Mccabe Powers Body Company Rotatable derricks for use on a truck or other similar mobile platform
US3197036A (en) * 1964-01-13 1965-07-27 Paul A Mason Powered combination elevating ladder and crane hoist
DE1247585B (en) * 1965-11-02 1967-08-17 Ormig S P A Device to compensate for the stresses occurring in a boom retraction device with two tie rods
US4621741A (en) * 1985-12-23 1986-11-11 Boon Charles W Readily disassembleable portable roof hoist mounted on the roof of a building for lifting heavy products to the roof from below

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3024916A (en) * 1956-07-16 1962-03-13 Edward V Garnett Vehicle derrick
US2888149A (en) * 1956-09-25 1959-05-26 J H Holan Corp Derricks
US2897979A (en) * 1957-09-23 1959-08-04 J H Holan Corp Portable boom
US2980263A (en) * 1959-10-16 1961-04-18 Holan Corp Derrick
US3146893A (en) * 1960-03-16 1964-09-01 Ohio Brass Co Derrick
US3154198A (en) * 1960-04-04 1964-10-27 Mccabe Powers Body Company Rotatable derricks for use on a truck or other similar mobile platform
US3096886A (en) * 1960-04-07 1963-07-09 Mccabe Powers Body Company Single-boom derricks
US3071255A (en) * 1960-06-27 1963-01-01 Theodore R Bill Derricks
US3121499A (en) * 1960-10-07 1964-02-18 Curtiss Wright Corp Aircraft propeller handling unit
US3197036A (en) * 1964-01-13 1965-07-27 Paul A Mason Powered combination elevating ladder and crane hoist
DE1247585B (en) * 1965-11-02 1967-08-17 Ormig S P A Device to compensate for the stresses occurring in a boom retraction device with two tie rods
US4621741A (en) * 1985-12-23 1986-11-11 Boon Charles W Readily disassembleable portable roof hoist mounted on the roof of a building for lifting heavy products to the roof from below

Similar Documents

Publication Publication Date Title
US2815250A (en) Machine with elevatable and traveling carriage
US2646182A (en) Loading and unloading apparatus
US2786581A (en) Portable derricks
US2399632A (en) Industrial truck
US2397271A (en) Hoist
US3239080A (en) Movable crane device for vehicles
US2786580A (en) Portable derricks
US3327879A (en) Front end loader
US3253716A (en) Crane having articulated boom
US2621812A (en) Machine for handling and transporting material
US2759563A (en) Adjustable counterweight for lift vehicles
US3638817A (en) Container handling and transporting device
US3750814A (en) Expandable top-handling container attachment
US2774484A (en) Gantry
US3070244A (en) Loader
US2864625A (en) Portable boom support attachment for vehicles
US3073397A (en) Portable digger
US3618800A (en) Container-dumping apparatus
US2706061A (en) Material handling equipment for industrial trucks
US3754666A (en) Folding crane
US2680525A (en) Portable crane
US3484003A (en) Hydraulic loading apparatus
US1929112A (en) Elevator for trucks
US2699875A (en) Crane
US3454173A (en) Container side loading system and means therefor