US1764988A - Motor-operated jack - Google Patents

Description

June 17, 1930. F. H. SCHWERIN MOTOR OPERATED JACK Filed Nov. 5, 1926 2 Sheets-Sheet l INVENTOR A TTORNEY June' 17, 1930.

F. H. SCHWERIN MOTOR OPERATED JACK Filed NOV. 5, 1926 2 Sheets-Sheet 2 A TTORNEY Patented June 17, 1930 Q TUNITED STAT -31 mm: omen-- FRANKH. soHwiJRIN, or BEL-nevus BOROUGH, PENNS LVANIA, ASSIGNOB. To-THE DUFF-NORTON MANUFACTURING COMPANY, or rrrrssneen, PENNSYLVANIA, A

CORPORATION or PENNSYLVA IA Moron-OPERATED neck 1 Application filed November 5 construetion having the motor incorporated Withthe jack, and further to provide a rigid virtually integral structure which can nevertheless be separated into a jack unit and a motor unit for ready replacement and re- 1; pair,- and further to provide in such a construction that the motor chamber and the interior of the jack I and gearing chamber shall be housed and sealed each against the other, in such manner that each will retain 5 its own supply of special lubricant. I In the accompanying drawing forming part hereof:

Fig; 1' is an elevation of I A v thejack, with parts broken away and in section; and v Fig. 2 is an elevation looking at right angles toFig. with other portions broken away and in section. i h

The jack has an enclosed frame or housing 2coinprising an enlarged lower portion or 25 3, and a standard portion 4. The bottom 5. of this housing, which rests upon the ground is preferably screwed intothe shell constituting the remainder of the base and the standard. A lifting member 6 is guided 3b in the upper part of the standard and has a nut 7 inits lower portion, while a lifting screw 8 is supported rotatably on the bottom of the jack on a bearing 9 and extends up- I ward through the nut into the. interior of 35 the lifting member. V

i A worm-wheel 10 is splined on the hub 11 on the lower end of the lifting screw, and this wheel is meshed by a worm 12 lying in a closed-top chamber 13 of the-basal portion 40 of the" jack housing. The shaft 14 on'which the worm is formed is journaled' in bearings 15, 16in said housing portion; and beyond the internal bearing 16 the basal housing is formed into a chamber 17 fora spur gear 18,

455 which is fixed to'this end of'the'wo'rm shaft.

5, 1926. Serial No. 146,293.

This chamber is open at the top, or would be if it were not covered by a complemental chamber to be described.

' The top of the basal portion of the main .jack housing which contains the worm chamber Bend the gear chamber 17 is formed with a flatledged seat 19, on which is planted the corresponding basal flange 20 of the housing 21 of a motor and gearing unit 22. Bolts 23 passing through these. meeting portions secure the units rigidly together; while a key pin 24 accuratelyfitting complemental recesses at t'l1e end of the meeting portions wherethegear 18 is housed insures the proper engagement of this gear 18 with a. pinion 25.

The motor is specifically an air motor of the cylinder and piston type having its crankshaft 26 at the bottom,and is placed directly over the worm chamber, with its shaft parallel with the worm; The housing of the enclosed motor has an annex 27 which may be made ofa separate piece from the housing of 'theimotor but firmly bolted thereto. Whereas the motor housing has closed bottom and side walls, this annex chamber has an open bottom to fit the open top of the gear chamber 17 of the main jack housing. A vertical wall 28 backof thegearing in the annex 27, together witha packing 29 inthis wall where the crank-shaft passes through it; seal the motor chamber from the gear chambers. The construction is such that the motor will retain the light oil in which it works, while the gear and jackchainbers may be supplied I withand will retain heavy oil or grease, the different lubricants being kept from ming1ing. f I v I The crank-shaft 26 has .a ball-bearing 30 in the wall 28 and extends across the annex chamber into a roller-bearing 31 in the end wall of thatcha'mber. The pinion25', which meshes with the gear 18 is fixedon a driven member'32, which rotatably supported on the crank-shaft? extension and in the roller bearing 31'. Thesaid member 32 has formed pinion 25 and gear 18 and the worm and worm- wheel 12 and 10, to the screw and nut 8 and 7. V 7

The motor drivesthe mechanism in both raising and lowering, either the worm or the screw, or both, being of self-holding pitch, and a valve 37 of known kind being provided for controlling and reversing the motor. .38 is the air supply hose.

The construction results in a compact and powerful motor-driven jack in which the jack and its driving motor and gearing are embodied in one portable, operative unit, this unit, however, being readily separable into two units or sections on the plane of cleavage lying between the horizontal shafts, one unit comprising the motor withpart of the gearing, and the other unit comprising the jack parts with the remainder of the gearing. If either unitbecomes damaged or requires attention it can be setaside or returned to the factory, and can be-replaced by another s1m1- lar uni V Y I claim V 1. A jack comprising a housing frame forming a base and standard, the latter pro- 7 vided with a nut, a lifting member, a lifting screw coacting with sald nut, aworm-wheel on the lower portion of said screw, a worm meshing said worm-wheel, an air motor mounted on the base of the jack directly over said worm and having a horizontal crank shaft parallel with the worm, power-multiplying gearing between said crank-shaft and the worm shaft, the motor andgearing having a housing joining with the main jack housing, the motor with part of said gearing, on the one hand, and the remainder of the j ack, including the worm wheel and worm and the remainder of said gearing, on the other hand, being. separable as units on a plane of cleavage cutting the housing between paid horizontal shafts, and means rigidl uniting said units together.

2A jack comprising a housing fram forming a base and standard, the latter provided with a nut, a lifting member, a lifting screw coacting with said nut, a worm-wheel on the lower portion of said screw, a worm meshing said worm-wheel, an air motor mounted on the base of the jack directly over said worm and having a horizontal crankshaft parallel with the worm, power-multiplying gearing between said crank-shaft and the worm shaft, the motor and gearing having a housing JOllllIlg with the main ack housing and the motor chamber being sealed tween the horizontal shafts, and

screw coacting withsaid nut, a worm-wheel on the lower portion of said: screw, a hori zontal shaft v1n said base/carrymgalworm meshlng said worm-wheel, a gear on theshaft of said worm, a motor mounted on the base of the jack directly over said worm and having a horizontal shaft parallel with the worm, a drlven member coaxial wlth the motor shaft and having a pinion meshing the gear on the wormshaft, a-planetary gearing between the motor shaft and said :driven member, the motor with said driven member and planetary gearing, on the one hand, and the remainder of the jack, including the worm wheel and worm and theg earon the worm shaft, on the other hand, being sepa rable as units on a plane of cleavage lying be.- p means rigidly uniting said units. together.

4. A jack comprising a housing forming a base and standard, the latter pro,-

I vided with a nut, a'lifting member, a lifting screw coasting with said nut, a worm-wheel frame on the lower portion of said screw, a worm meshing said worm-wheel, an air motor mounted on the base of the jack directly :over said worm and having a horizontal crankshaft parallel with the worm, power-multithe worm shaft, the motor-and gearinghavving a housing joining with the main jack housing, walls enclosing and sealing themotor chamber from the gearing and chain hers, the motor with part of said gearing, on

meshing said worm-wheel, the baseportion of the jack housing containingspaced bearings for the worm shaft, a closed worinchamber between said bearingseand an open top gear chamber outside of one of said bearings,

a gear on the end of the worm 'shaftin'said gear chamber, a housed motor unit mounted .105 plying gearing between said crank-shaft and on said base portion of the ack housing, said motor unit having a closed motor chamber over the Worm chamber and a gearing chamber annex open at the bottom to fit the gear chamber of the base, power-multiplying gearing in said gearing chamber annex between the motor shaft and said gear on the worm shaft, and means rigidly and separably uniting the housing of the motor unit and its gearing chamber annex to the housing of the base.

FRANK 1-1.1 SCHWERIN.

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