|Publication number||US396321 A|
|Publication date||Jan 15, 1889|
|Filing date||Jun 2, 1888|
|Publication number||US 396321 A, US 396321A, US-A-396321, US396321 A, US396321A|
|Inventors||Joseph H. Baird|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (12), Classifications (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
J. H. BAIRD.
No. 396,321. Patented Jan. 15. 1889.
1 mmmm g miiit UNITED STATES PATENT OFFICE.
J OSEPII H. BAIRD, OF OAKVILLE, CONNECTICUT.
SPECIFICATION forming part of Letters Patent No. 396,321, dated January 15, 1889.
I Application filed June 2, 1888. Serial No. 275,823. (No model.)
To all whom it may concern..-
Be it known that I, JOSEPH I'l. BAIRD, a citizen of the United States, residing at Oakville, in the county of Iiitchfield and State of Connecticut, have invented certain new and useful Improvements in Sectional Jacks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains ,to make and use the same. I
My invention has for its object to produce a jack adapted for general uses, and especially valuable for use in connect-ion with planers and other metal-workin g machines, where it is frequently necessary to support heavy blocks of metal while being operated upon at various angles.
In order to provide a handy tool for this and similar purposes, I have dew'sed the novel sectional jack, of which the following description, in connection with the accompanying drawings, is a specification, numbers being used to denote the several parts.
Figure l is an elevation of the device complete and in operative position; Fig. 2, an elevation showing the parts detached, and Fig. 3 a longitudinal section corresponding with Fig. 1.
1 denotes the sections, which may be made of any convenient length, and any desired number may be used in a single jack. The sect-ions are preferably provided with central openings, 3, in line with each other, with sockets 3 in their bases and with hubs t at their upper ends, the sockets and hubs all being of exactly the same size, so to make the parts interchangeable. \Vhen made of large size as, for instance, for jacking railway-cars and other heavy liftingeither of the sections 1 may serve as the base of the jack. For planers and other machine-shop work I provide a special bottom section, 5, the sides of which are tapered, as shown. This is in order that the jack may be readily supported at. various angles and in various positions where it is not practicable to geta level support for the base.
6 denotes the top section, which is provided with an internal screw-thread and with a heavy screw,-7, which engages the thread. If preferred, I provide at the top of this section a cappiece, 8, having a socket, 9, and a setscrew, 10, the head of which rests in the socket and which passes through the cap-piece and engages screw 7, so that the cap-piece is held in position, but screw 7 is free to turn independently thereof. In use the screw is turned to lift by means of a wrench applied to squared portions 11 or 12, or by pins or levers inserted in holes 13. The operation is so simple as hardly to require explanation.
For general machine-shop purposes I ordinarily furnish jacks consisting of four sections in addition to the special top and bottom sections and the screw. In use the jack is made approximately the length desired by placing a sutlicient number of sections together. The base or bottom section is placed firmly in position, and then the screw is rotated to lift the weight to the desired height. By this means I avoid the serious inconvenience and other objections attending the common practice of blocking up, and provide a simple tool complete in itself and adapted to all the various purposes for which this class of tools is intended."
Having thus described my invention, I claim As a new manufacture, a lifting-jack comprising interchangeable sections of varying lengths, each section having a socket and hub, as shown, and a top section adapted to engage any section of the series and provided with a lifting-screw of ordinary construction.
In testimony whereof I affix my signature in presence of two witnesses.
JOSEPH H. BAIRD.
DANL. F. WEBSTER, CHAS. IV. VILLETTE.
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