US3481583A

US3481583A - Balancing hoist

Info

Publication number: US3481583A
Application number: US676877A
Authority: US
Inventors: Otmar M Ulbing
Original assignee: Ingersoll Rand Co
Current assignee: Ingersoll Rand Co
Priority date: 1967-10-20
Filing date: 1967-10-20
Publication date: 1969-12-02
Anticipated expiration: 1986-12-02

Description

Dec. 2, 1969 o. M. ULBING 3,481,583

BALANCING HOIST Filed Oct. 20. 1967 5 Sheets-Sheet l INVENTOR 07' MAI? M. UL BIA/G AGENT 0. M1 ULBING BALANCING HOIST Dec. 2, 1969 5 Sheets-Shee t 2 Filed Oct. 20, 1967 rppilpiurrlpai. 1

INVENTOR 0mm UL BIA/6 my W74 AGENT Dec. 2, 1969 Filed Oct. 20, 1967 O. M. ULBING BALANC ING HOI ST 5 Sheets-Sheet 3 FIG. 3

INVENTOR OTMAR M. ULB/NG AGENT 1969 o. M. ULBING 7 3,481,583

' BALANCING HOIST Filed Oct. 20, 1967 5 Sheets-Sheet 4 INVENTOR OTMAR M. ULBI/VG United States Patent 3,481,583 BALANCING HOISP Otmar M. Ulbing, Berkshire, N.Y., assignor to Ingersoll- Rand Company, New York, N.Y., a corporation of New Jersey Filed Oct. 20, 1967, Ser. No. 676,877 Int. Cl. B66d N36 US. Cl. 254-168 1 Claim ABSTRACT OF THE DISCLOSURE A balancing hoist using a rotatable ball screw and fixed ball nut for rotational and axial movement of the drum before a pneumatically displaced piston.

This invention relates to hoists, and in particular to a balancing hoist having a simplified arrangement for rotating and translating the drum thereof. Prior art pneumatic hoists have rather complex arrangements, to effect the rotation and translation of the drum, having many interacting components subject to wear and requiring frequent maintenance services. It is an object of this invention, therefore, to provide an improved and simplified arrangement for the rotation and translation of the drum within the hoist. A feature of this invention comprises the use of a rotatable ball screw cooperative with a fixed ball nut acted upon by a piston to rotate and translate the cable drum.

The aforementioned and other objects and features of this invention will become more apparent by reference to the following description taken in conjunction with the accompanying drawing which is a cross-sectional elevational view of the hoist according to the invention less a portion of the trolley support structure.

In FIG. 1 index number 1 is the piston side end cap, 2 the cylindrical member and 3 the control side end cap. The control end cap carries ball nut 4 which is keyed against rotation by key 5. Ball screw 6 turns in ball nut 4 and supports cable drum 7 held by bolt 8 and keyed against rotation by key 9. Piston 10 acts upon the drum-nut assembly through thrust bearing 11.

Packing 12 seals the piston 10 against the cylinder 2. Cable shield 13 prevents the cable 14 from jumping out of the drum groove 15, and groove 16 in the shield permits insertion of a ball 17 swedged to the end of the cable 14. This ball 17 is received in slot 18 of the cable cable drum 7 and anchors the cable 14. Cable replacement, therefore, can be made without disassembly of the balancer.

It is my teaching to use a ball nut 4 and ball screw 6 to rotate and translate the drum 7, in which the ball nut is held stationary and the ball screw turned therein and out. While it would seem immaterial whether the one or the other of the elements is rotated, at heretofore unexpected benefit arises in stabilizing the ball nut 4 and turning the ball screw 6. For one, it is not necessary to penetrate the piston 10 with the ball screw 6, and then have to be involved with sealing along the penetration. Rather, the screw 6 is fixed to and carried by the drum 7; the screw terminates within the drum, leaving intact the surface of "ice the piston 10, and translates therewith. Further, the loading of the ball nut 4 is always thereacross. Never does the loading, via the paying-out of cable 14, get beyond the ball nut, before the ball nut, or behind it. Loading always occurs across the same cross-sectional area of the ball nut, thus the ball nut is never met with variably-displaced, fore and aft loading stresses. This novel feature greatly enhances the life and maintenance of the two, interacting threaded components.

As set forth in the foregoing, my invention teaches an improved use of a fixed ball nut and a rotatable ball screw to derive the benefits thereof while avoiding the high mortality known hereto-fore with such components.

While I have described my invention in connection with specific apparatus, it is to be clearly understood that this is done only by way of example.

I claim:

1. A balancing hoist, comprising:

a casing, said casing defining a cavity therein;

a drum disposed in said cavity for rotational and axial movement therein;

a cable wound on said drum having one end extending from said cavity, externally of said casing to receive work loading, the other end replaceably secured to said drum; and

first means coupled to said casing for causing movement of said drum within said cavity; wherein said first means comprises input means for introducing pressurized fluid to one end of said cavity, means carried by said casing for supporting said drum for axial movement relative to said casing, a ball nut and ball screw cooperative with said support means for rotating said drum during axial movement thereof, and piston means disposed between said input means and said drum, and coupled to said drum, to move said drum relative to said support means upon introduction of pressurized fluid; and wherein said ball nut is fixed to said support means and said ball screw is coupled, at either ends thereof, non-penetratively thereof to said piston and penetratively thereof to said nut, in being abuttingly fixed to said drum and threadedly engaged with said nut at said either ends, for movement of said screw in unison with said drum and relative to said support means, causing said cable to be payed-out and retrieved along a line of suspension which is invariable relative to said support means, upon movement of said drum and said screw.

References Cited UNITED STATES PATENTS 2,082,633 6/1937 Johnstone 188-174 2,868,504 1/1959 Minty 254-168 2,987,786 6/1961 Smith 212-134 3,260,508 7/ 1966 Powell 254168 HARVEY C. HORNSBY, Primary Examiner US. Cl. X.R.