US832657A

US832657A - Gear-operated screw-plunger.

Info

Publication number: US832657A
Application number: US28077805A
Authority: US
Inventors: Christian Dorn
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-09-30
Filing date: 1905-09-30
Publication date: 1906-10-09
Anticipated expiration: 1923-10-09

Description

PATENTED OCT. 9, 1906.

0.00m. GEAR OPERATED somzw PLUNGER.

APPLICATION FILED SBPT.30,1905.

UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented. Oct. 9, 1906. 7

Application filed September 30,1905- Serial No. 280,778.

To all whom, it may concern:

Be it known that I, CHRISTIAN DORN, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Gear-Operated Screw- Plungersf of which the following is a specification.

My invention consists of certain details of constructioniwhereby a gear-operated screwplunger can be readily relieved from the control of the primary member of the gearing when desired, or when it has reached a certain predetermined position can be released from that member of the gearing with which it is normally in engagement.

For purposes of illustration I have in the drawings shown the gear-operated screwplunger as applied to an automatic lubricator, although it may, as will be evident, be used in connection With the plunger of a press orin other relations, if desired. I

In the drawings, Figure 1 is a side elevation of an automatic lubiicator provided with ,a gear-actuated screw-plunger in accordance with the invention. Fig. 2 is a plan view of the same. Fig. 3 is a transverse section on the line a a, Fig. 2.

In the drawings, 1 represents the cup for containing the lubricant, the latter being preferably of semisolid character, although it may be in liquid form, if desired. Fitting snugly within this cup is a plunger 2, which is swiveled or mounted so as to be free to ro-' tate upon the lower end of a threaded stem 3, the latter being adapted to a threaded opening in the cap or cover 4 of the cup, so that as said stem is rotated the plunger 2 will be caused to move up or down in the cup without, however, having any movement of rotation imparted to it.

The screw-stem 3 is flattened on one or both sides and is also reduced in diameter at the top, as shown at 5, at which point it is also provided with a handle 6, whereby it may be rotated by hand when desired.

The flattened screw-stem 3 passes through a central opening in a spur-wheel 7, which which rests upon the top of the cap 4 and meshes with a worm 9, secured to a shaft 10, the latter being adapted to bearings 11, one of which is carried by a ring 12 at the top of the cup and the other by a bracket 13, projecting from said ring.

The teeth of the spur-wheel 7 are strai htfaced, so that such wheel can be readily lifted from its engagement with the worm 9 when it is desired to rotate the screw-stem 3 by hand, and the reduced portion 5 of the screwstem is of less diameter than the narrowest portion of the opening in the spur-wheel, so

that when the plunger 2 has been fully de,

pressed further rotation of the wheel will have no effect upon the screw-stem, and injury to the parts, such as would be caused by excessive movement of the latter, is thus prevented.

In order to prevent accidental release of the spur-wheel 7 from mesh with the worm 9, when the cup is so mounted as to have vertical reciprocating movement, a retainingfinger Sis pivotally mounted upon the bracket 13, so that it can overlap the spur-wheel, as shown, or can be swung laterally out of engagement therewith. when it is desired to lift the spur-wheel on the stem 3. I

The shaft 10 is driven by ratchet-and-pawl mechanism operated by a swinging yoke 25; but this forms no part of my present invention.

Having thus described my invention, I claim and desire to secure by Letters Patent 1. The combination of a threaded stem, a nut engaged thereby, and gearing for rotating said stem, said gearing comprising a spurwheel engaging the stem, and a worm meshing with the spur-wheel but from which the latter can be readily freed by vertical movement on the stem so as to permit rotation of the latter independent of the worm, substantially as specified.

2. The combination of a threaded stem, a nut engaged thereby, and gearing for rotating said stem, said gearing comprising a spurwheel engaging the stem, a worm meshing with the spur-wheel but from which the latter can be readily freed by vertical movement on the stem so as to permit rotation of the latter independently of the worm, and a movable retainer for temporarily confining said spur-wheel to the nut, substantially as specified.

3. The combination of a threaded stem 1 In testimony whereof I have signed my having a reduced upper end, a nut engaged name to this specification in the presence of by said stern, and gearing for rotating said two subscribing Witnesses.

stern, one of the elements of said gearing be- CHRISTIAN .DORN. 5 ing a spur-wheel engaging the stern but free Witnesses:

to turn on the reduced upper portion of the l KATE A. BEADLE,

same, substantially as specified. i Jos. H. KLEIN.