US326640A

US326640A - Machine-table

Info

Publication number: US326640A
Authority: US
Publication date: 1885-09-22
Anticipated expiration: 1902-09-22

Description

. 2 Sheets-Sheet 1.

(No Model,)

B. L. 8a R. S. GREENLEE.

MACHINE TABLE.

No. 326,640. Patented Sept. 22, 1885.

FIBl

FIG. 2.

INVENTOR BY M%XM ATTORNEY WITNESSES W gnpher. wnm

(No Model.) 2 Sheets-Sheet 2.

R. L. &' R. S. GREENLEE.

MACHINE TABLE.

No. 326,640. Patented Sept. 22, 1885.

WITNESSES: INVENTOR B wwm Kim.

ATTORNEY UNITED STATES PATENT OFFICEO ROBERT L. GREENLEE AND RALPH S. GREENLEE, OF CHICAGO, ILLINOIS.

MACHINE-TABLE.

SPECIFICATION forming part of Letters Patent No. 326,640, dated September 22, 1885. Application filed November 26, 1884. (N0 model.)

To all whom it may concern.-

Be it known that we, ROBERT L. GREENLEE and RALPH S. GREENLEE, citizens of the United States, and residents of Chicago, county of Cook, and State of Illinois, have invented new and useful Improvements in Saw-Tables, of which the following is a specification, reference being had to thelaccompanying drawings, illustrating the invention, (two sheets,) in which- Figure 1 is a plan or top view of a saw table; Fig. 2, a longitudinal elevation of the table and elevating devices looking in direction of dart m, Fig. 1; Fig. 3, Sheet 2, a View of the elevating devices with the table removed; Fig. 4, a cross-section of Fig. 2 on line 2 looking in direction of dart 3 The purpose of the present invention is to provide better means for vertically adjusting saw-tables, and they are as follows: Hung to the sides of the main frame of the sawingmachine, near the ends thereof, are two rockshafts, each of which carries two arnrlevers. The ends of each set of levers connect with the table by means of rods,- and these two sets of levers are held to have a uniform movement by means of a jointed connecting-rod, whereby the movement communicated to one set of arm-levers will impart to the other set of arm-levers the same movement. In the present construction the arm-levers at one side of the machine and on each rock-shaft are placed outside of the main frame of the machine, not as a necessity, but as a conven ience, the other arm-leyers being placed within the frame for the same reason. On one side of the machine is a lever, which is rigidly attached to one end of one rock-shaft and used to elevate and depress the table, the lever being connected with a slotted segment by a screw and lever nut to hold the table to any point to which it is adjusted. The weight of the table is counterbalanced by-weights which are suspended from levers attached to one of the rock-shafts. The table is held in place vertically over the frame by means of vertically-attached guides running in sleeves attached to the frame.

A represents a saw-table, and B G D E are the sides and ends of the machine-frame.

F represents the hole or slot for the projec tion of the saw through the table.

J K represent rock-shafts, which have suit able bearings in the sides D E of the frame, and to which are keyed, respectively, armlevers G G I I, and also levers N-O, which are jointed to a connecting-rod, P. The levers G G I I are connected to the table A A a a by means of rods Q and pivot-joints, so that the parts move on their bearing freely, but without lost motion.

To the rock-shaft J are attached two levers, It, from which are suspended weights S, which serve to balance the weight of the table and therefore lessen the power required to elevate it.

A crank-lever, L, is attached to the rockshaft J at the outside of the machine, and it is held in a fixed position by means of a slotted segment, M, and a screw and lever nut, T, of ordinary construction.

The table is guided in its vertical move ment by the guides U, attached to it and fitted to run in sleeves V. This construction is such that any movement given to the crank end of the table gives a corresponding movement to the other end thereof without lost motion, the table in any of its adjusted positions being level with the frame supporting it by means of the mechanism shown.

The letters H b X represent a gage for horizontally adjusting material on the table to be sawed, but is only shown in this application to illustrate how a horizontal gage may be used in connection with a table vertically adjusted by our improvements.

An advantage of our mode of elevating and depressing the table aside from the level position thereof at all points is the evenness with which the strain is equalized on the rockshaft levers and arm-levers by means of the central arms and central connecting-rod. It is presumed that it is desirable to elevate and depress the table to accommodate it to the thickness of the stuff to be sawed and the size of saw used.

We do not claim to be the originators of a vertically-adjustable saw-table, but the novel means herein shown and described whereby we attain such adjustment.

Having thus described our invention, we claim and desire to secure by Letters Patent- In adjustable saw-tables, the rock-shafts J K, having bearings in the sides D E of the Weighted lever B S, for balancing the table, and the lever L, for elevating and depressing the table, and the nut-lever T and segment M, for holding the table adjusted, as specified.

ROBERT L. GREENLEE. RALPH S. GREENLEE.

Witnesses:

G. L. OHAPIN, A. G. MoREY.