US 3788680 A
The invention disclosed herein relates to a lifting member and more specifically to an extendable type horizontal lifting bar adapted for adjustment by a pair of slidable telescoping members and a unique clamping device for rigidly affixing them in individual positions for adjustment to maintain a load to be lifted in a horizontal position at all times.
Claims available in
Description (OCR text may contain errors)
United States Patent [191 Brown Jan. 29, 1974  ()RDNANCE HANDLING DEVICE 1,603,421 10/1926 Shaffer 294/67 E X  Inventor: Malcolm B. Brown, Oreland, Pa. FOREIGN PATENTS OR APPLICATIONS 73 Assignee: The United states of America as 1,480,384 5/1967 France 294/81 R represented by the Secretary of the 1,439,248 12/1966 France 294/81 R Navy, Washington, DC Primary Examiner-Evon C. Blunk  Flled: June 1972 Assistant Examiner-Johnny D. Cherry  Appl. No.: 265,084 Attorney, Agent, or Firm-R. S. Sciascia; R. J. Miller 52 US. Cl. 294/81 R, 294/67 R  t ABSHMQT 511 Int. Cl. B66c 1/12 The lnventwn disclose-Ql herem relates to a llftmg  Field of Search 294/67 R, 67 AA, 67 B, member and more speclfically to an extendable yp 9 7 BB, 7 D A 7 E 7 81 R 3 51: horizontal lifting bar adapted for adjustment by a pair of slidable telescoping members and a unique clamp-  References Cited ing device for rigidly affixing them in individual posi- UNITED STATES PATENTS tions for adjustment to maintain a load to be lifted in a horizontal position at all times. 3,076,673 2/1963 Kaplan et al 294/85 3,601,440 8/1971 Evans 294/81 R X 7 Claims, 5 Drawing Figures 7 '-1 5 I I I LQ 1 2 J- l n l I 'rgn-65 s q l 23 q, 2 3 ,j 4 s 64 24 ORDNANCE HANDLING DEVICE The invention described herein may be manufactured and used by and for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.
Ever since man has had loads to be lifted greater than his own capabilities to lift, he has utilized lifting devices to achieve his desired purpose. The art is old in lifting devices and it is only with the advent of new types of problems that new devices are often times developed.
When lifting a load from one position to another it is often necessary to maintain that load in a horizontal position and at the same time lift such a load. An individual load whose center of gravity does not correspond to its center of moment may be lifted in a horizontal position.
Towards this end this invention is directed.
Further, the lifting device must be compatible with existing equipment and must be packaged for easy shipment, and in addition, they should be ruggedly designed and be interchangeable so that they may be repaired in the field quickly with a minimum of spare parts and labor.
It is therefore an object of this invention to provide an improved horizontal lifting device.
It is a further object of this invention to provide an improved horizontal lifting device having a central portion, two telescoping end members, two or more clamping members positioned for applying compressing force to rigidly affix, by friction, the telescoping members within the adjustable predetermined position in the housing member.
It is a further objective of this invention to provide an improved lifting member capable of adjustment by slidable position, two telescoping members within a housing member and providing an improved clamping method consisting of two plate members opposite positioned on faces of housing member and having sloping face portions contacting the housing member and connected by a fastening member capable of drawing the two plate members together and applying pressure to the housing member forcing it into a tight, friction fit with the telescoping members thereby rigidly affixing the telescoping members within a preset position in the housing member.
Other objects, advantages and novel features of the invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing wherein:
FIG. 1 is an overall view of the device.
FIG. 2 is a section view along lines 2-2 in FIG. 1.
FIG. 3 is a section view along lines 33 in FIG. 1.
FIG. 4 is a section view along lines 4-4 in FIG. 1.
FIG. 5 is a section view along lines 55 in FIG. 1.
The telescopic beam or strong back consists of a central member and extendable members 21 and 22. Extending from telescopic members 21, 22 are shown cables 23, 24 connecting to the load 11 for lifting. A beam hanger lug 25, connected to member 20 is provided for suspension from a crane, not shown. First and second clamp members 30, 31 are shown, one on either side of the hanger lug, and their purpose is to hold telescopic members 21, 22 in a fixed relationship to beam 10 after their length has been selected for lifting a given load. It should be noted it is not necessary to extend members 21, 22 equally, but rather they may be extended unequally so that the load is maintained in a substantially horizontal position regardless of the distribution of weight within load 11.
FIG. 2 shows central beam 20 to consist of a first channel member 35 and a second channel member 36 spaced apart and held in a rigid position by brace plates 37 and 38. Clamp member 30 and hanger lug 25 are also shown.
FIG. 3, the view along lines 33 of FIG. 1, shows the telescopic beam member 22 to be composed of a first channel member 40 and a second channel member 41 spaced apart and rigidly held that way by brace plates 42, 43.
FIG. 4 shows the details of clamp member 31 to include a first clamp plate 50 and a second clamp plate 51 having sloping faces 52, 53, 54, and 55. A centrally disposed bolt 60 is rigidly affixed to clamp plate 50 and passes thru a hole 61 in clamp plate 51. The lower end of bolt 60 is a threaded portion mounted thereto as a wing nut 64.
FIG. 5, a view along lines 5-5 in FIG. 1, shows telescoping beam 22 to have a cable holding member 70 to hold cable 24 which is rigidly affixed to the end of telescoping beam 22.
In operation, the desired extension of telescoping beams 21 and 22 is obtained, and wing nuts 64 and 65 are tightened, drawing first clamp member 50 and second clamp member 51 towards each other causing the sloping faces 52, 53, 54 and 55, to force the channel members 35, 36 inward against channel members 40, 41 and thus causing a tight friction fit between beam 20 and telescopic beams 21, 22. The forces and friction are such that under load conditions, beams 21, 22 may not slide within beam member 20.
Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.
1. An improved lifting member comprising:
a. a body member consisting of first and second longitudinal members rigidly attached to each other having formed therebetween first and second longitudinal slots;
b. a first extendable member consisting of third and fourth longitudinal members rigidly affixed to each other and spaced from each other to form third and fourth longitudinal slots therebetween;
c. a second extendable member consisting of fifth and sixth longitudinal members rigidly affixed to each other and spaced from each other to form fifth and sixth longitudinal slots therebetween;
d. a first clamping means positioned on said body member having first and second positions, said first position allowing said first extendable member to move within said body member and in said second position said first extendable member is held by friction in a preset position; and
e. a second clamping means positioned on said body member having first and second positions, said first position allowing said second extendable member to move within said body member and in said secnd position said second extendable member is held by friction in a preset position.
2. The improved lifting member of claim 1 wherein there is provided a centrally disposed hanger lug mounted on said body member.
3. The device of claim 2 wherein said first and second longitudinal members of said body member is channel shaped.
4. The device of claim 3 wherein said third, fourth, fifth and sixth longitudinal members of said first and second extendable members are channel shaped.
5. The device of claim 4 wherein said first clamping means include a first plate attached to a connecting member, said connecting member extending thru said first, third, fourth and second longitudinal slots and a second plate member, a threaded nut member positioned to draw said first and second plate members together to cause a friction fit between said body member and said first extendable member.
6. The device of claim 5 wherein said second clamping means include a first plate attached to a threaded connecting member, said connecting member extending thru said first, fifth, sixth and second longitudinal slots and a second plate member, a threaded nut member positioned to draw said first and second plate members together to cause a friction fit between said body member and said second extendable member.
7. The device of claim 6 wherein first and second suspension means affixed to said first and second extendable members for connecting to a load to be lifted.