US1943737A - Combination jack - Google Patents

Combination jack Download PDF

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Publication number
US1943737A
US1943737A US367285A US36728529A US1943737A US 1943737 A US1943737 A US 1943737A US 367285 A US367285 A US 367285A US 36728529 A US36728529 A US 36728529A US 1943737 A US1943737 A US 1943737A
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United States
Prior art keywords
jack
screw
gear
housing
sleeve
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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
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US367285A
Inventor
Austin O Middlemiss
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Individual
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Individual
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Priority to US367285A priority Critical patent/US1943737A/en
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Publication of US1943737A publication Critical patent/US1943737A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • B66F3/18—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated actuated through worm gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • B66F3/20—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated actuated through multiple or change-speed gearings

Definitions

  • This invention relates to jacks of the mechanical type.
  • the object of the invention is to produce a jack, eiiicient in operation by being both simple and geared, combining strength and light- 5 ness and also compactness in proportion to the lift.
  • a further object of the invention is a construction so designed that the jack is automatically protected from lifting too far and disengaging the screw threads.
  • Fig. 1 is a side elevation of the jack and cross sections.
  • Fig. 2 is a top View.
  • I is the base; A is the screw bolted to the base; B is a sleeve or nut which is fitted to turn on part A; part C is a gear housing holding the gears and tted to allow relative rotation of part B but rising with it; part H is hinged at K and can be placed parallel to the axis of the screw or turned down as shown by the arrow.
  • part H is out of the part C, part C and the part B which is locked to part C by the gearing may be rotated by a bar placed in the bosses O. This makes it possible for the jack to operate as a simple screw jack.
  • I-I is a pivotally mounted housing restraining member. When part H engages part C, and suitable turning means are used on part F, the part B is revolved with the gearing with great power through the worm P, the worm wheel E which is integral with gear D, gear D turns gear N which is integral with the nut B.
  • the top is shown as a spherical seat on the part B, Q is a washer, N is a spring and M is a screw.
  • a jack of the class described the combination of a base with a screw attached, a threaded sleeve iitted to the screw, a gear housing surrounding the sleeve, hollow projecting bosses on the housing, a geared drive comprising a worm wheel and a worm embraced by the housing and a restraining member coacting with a notch in the housing of limited height and pivotally attached to the base member.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)

Description

Jan. 16, I A Q MlDDLEMlSS COMBINATION JACK Filed May 51,'1929 um i \ Ily INVENTOR Patented Jan. 16, 1934 UNITED STATES PATENT OFFICE 1 Claim.
This invention relates to jacks of the mechanical type. The object of the invention is to produce a jack, eiiicient in operation by being both simple and geared, combining strength and light- 5 ness and also compactness in proportion to the lift. A further object of the invention is a construction so designed that the jack is automatically protected from lifting too far and disengaging the screw threads. These and other features will be apparent by a study of the accompanying drawing and specifications.
Fig. 1 is a side elevation of the jack and cross sections.
Fig. 2 is a top View.
l5 Referring to these views, the part details are as follows: I is the base; A is the screw bolted to the base; B is a sleeve or nut which is fitted to turn on part A; part C is a gear housing holding the gears and tted to allow relative rotation of part B but rising with it; part H is hinged at K and can be placed parallel to the axis of the screw or turned down as shown by the arrow. When the part H is out of the part C, part C and the part B which is locked to part C by the gearing may be rotated by a bar placed in the bosses O. This makes it possible for the jack to operate as a simple screw jack. I-I is a pivotally mounted housing restraining member. When part H engages part C, and suitable turning means are used on part F, the part B is revolved with the gearing with great power through the worm P, the worm wheel E which is integral with gear D, gear D turns gear N which is integral with the nut B.
After part C has risen to a point such that it clears member H, further rotation of the part F will cause the entire gear train to rotate with relation to the base I and the sleeve B. The sleeve B therefore fails to rotate and becomes automatically inoperative as a geared jack, leaving a safe amount of threads engaged.
The top is shown as a spherical seat on the part B, Q is a washer, N is a spring and M is a screw.
Special attention is called to this construction, which makes it possible to make the part B thick around the central hole and makes the oscillating top L tend to return to center.
Having thus clearly described my invention, what I claim is:
In a jack of the class described, the combination of a base with a screw attached, a threaded sleeve iitted to the screw, a gear housing surrounding the sleeve, hollow projecting bosses on the housing, a geared drive comprising a worm wheel and a worm embraced by the housing and a restraining member coacting with a notch in the housing of limited height and pivotally attached to the base member.
AUSTIN O. MIDDLEMISS.
US367285A 1929-05-31 1929-05-31 Combination jack Expired - Lifetime US1943737A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US367285A US1943737A (en) 1929-05-31 1929-05-31 Combination jack

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US367285A US1943737A (en) 1929-05-31 1929-05-31 Combination jack

Publications (1)

Publication Number Publication Date
US1943737A true US1943737A (en) 1934-01-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
US367285A Expired - Lifetime US1943737A (en) 1929-05-31 1929-05-31 Combination jack

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