US1652802A - Grain-door table - Google Patents

Description

Dec. 13, 1927.

L. SMITH GRAIN DOOR TABLE Patented Dec. :13, 1927. 1,652,802 .UNITED STATES PATENT OFFICE.

LEONARD SMITH, OF BASTROP, LOUISIANA, AS IGNOR TO M.

CHICAGO, ILLINOIS.

A. MUMMERT, OF

GRAIN-DOOR TABLE.

Application filed April 18, 1927. Serial No. 184,480.

of the nailing top sheet 11. A helicallycoiled expanding spring is interposed between each of the eyes and a washer 21 restlng against the head 22 of the bolt, so that the clamping bar is drawn outwardly by the springs 20 so as to keep it in engagement with the two eccentric disks 23 by which the bar is moved. These eccentric disks 23 are preferably journaled on the bolts 2%, which, as best seen in Fig. 2, project upwardly through the pair of metallic reinforcing strips 25 extending transversely of the nailing top sheet and secured thereto by the screws or rivets 26, the heads of the bolts resting againstthe under sides of the strips 25, while the upper portion 27 thereof, which forms the bearing for the eccentric block 23, is reduced in diameter, as shown, and the bolts and eccentric blocks are -held in place by the nuts 28, as will be readily understood. To turn the eccentric blocks 23, I provide the handle bars 29, which are preferably steel rods, which are passed through the projection 30 formed on the top of the eccentric disk 23, and having an aperture of the right size to receive the handle 29 passed therethrough, preferably at a slight angle to the horizontal, so that when the operator pulls the end of the bar over the channel 16, his hand will not strike the channel. The handle is secured in any desired adjustment for its length by the set screw 31.

Sometimes it is desirable to make grain doors that are slightly narrower than the standard width, and in order to make the apparatus operate more efliciently upon such narrow doors, I pivot on the rear vertical flange of the channel bar 16 the pair of short spacing bars 32, which are shown as turned over out of the way and not in use. It will be understood that when it is desired to use them, they will be turned over on their pivots until they rest between the clamping table lengthwise with their ends engaging bar channel 16 and the eccentrics 23. It will the abutment 15. also be noted that the clamping bar is held The movable clamping mechanism consists in its approximate position by the action of of a movable clamping bar 16, which is prefthe bolts 17, but it is prevented from any erably composed of a channel bar three substantial longitudinal displacement by reainchcs wide and having inch and a half verson of the fact that one end thereof substantical flanges, and extending, as shown, subtially contacts with the abutment 15, while stantially the entire length of the table. It the other end thereof will substantially conhas secured in the ends thereof the rods 17, tact with the vertical flange of the similar which may be held by the nuts 18, and which but shorter abutment 33. It will be underextend through the eyes 19 projecting upstood, of course, that the abutment 33 is ward from the edges of the adjacent side shortened up so as not to interfere with the My invention is concerned with grain door tables or clamps, which are used in the manufacture of grain doors to hold the longitudinally extending pieces of lumber constituting the body of the door tightly pressed together while the transverse battens are being nailed in place to hold the longitudinally extending pieces rigidly together to form the complete door, and it is dcsigned to pro- 30 duce a device of the class described which shall be simple in its construction, easily operated, and commercially eflicient.

To illustrate my invention, I annex hereto a. sheet of drawings in which the same reference characters are used to designate identical parts in all the figures; of which,-

Fig. 1 is a top plan view of the table;

Fig.2 is a vertical section on the line 22 of Fig. 1, but on a larger scale; and

Fig. 3 is a perspective view of one corner thereof, on a still larger scale.

In carrying out my invention in its preferred form, I employ a wooden frame 10, of any desired construction, and preferably consisting of the rectangular body portion and four or six legs to support the same, and on top of this table I secure the nailing top sheet 11, which preferably consists of a piece of sheet steel large enough to cover the top, and preferably three-eighths of an inch in thickness. This may be secured to the frame by screws 12 at the edges thereof, or in any desired manner. On one side of the table, I form a rigid abutment 13 extending the length thereof, and preferably formed of a strip of angle iron with a vertical flange projecting upward, say, an inch and a half,- and a two-inch horizontal flange secured to the edge of the nailing top sheet 11 by rivets 1 1. A similar abutment 15, preferably composed of angle iron and similarly secured, is located at one end, and it will be understood that the boards are placed on the its purposes, it

shoving of the boards on to the nailing top sheet from that end.

The use of my improved apparatus will be readily understood. The two nailers stand on the side carrying the abutment 13, and the longitudinally extending pieces of the door are placed on the nailingtopsheet between the abutment 13 and the clamping member 16 with their ends engaging the abutment 15, and when the number to make the door are, in place, the operators reach across the table and turn the eccentrics 23 by hand until the clamping bar 16 engages the adjacent' piece of lumber, when the hands are shifted to the ends of the levers 29 and thereby pulled toward the operator and powerful. pressure thus produced. It will be understood that with the parts as shown in Fig. 1, the operators turn the eccentric disk 23 by hand anti-clockwise, andthat when it is necessary to take hold of the handles29 they will have been swung aroundfthrough something less than one hundred andeighty degrees, so that the final pull on the handles is directly toward the operators, so that the power 18 applied most efficiently. Then the boards are thus clamped between the abutment 13 and the ,bar 16, the handles are released and the nailwhichthe movement of the the finished door. described my ining done, after handles is reversed totree Vlhile I have shown and vention as embodied in the present consider'best adapted to carryout willbe understood that it is capable of modification, and that I do not desire tobe limited in the interpretation of the following claims except as may be necessitated by the state of the prior art.

What I claim as new, and desire to secure by Letters Patent of the United States, is:

1. In a device of the class described, the combination with a nailing top sheet, of a rigid abutment located'on one side thereof, a movable clamping bar opposedto the abutment, a pair cal axes located adjacent the clamping bar, handles swinging in asubstantially horizontal plane connected to said eccentrics, and guiding means to hold the outer side of said clamping bar yieldingly against the eccentrics, said means consisting of a pair of rods secured to and extending rearwardly from the ends ofthe bar, stationary eye pieces through which the rods pass, and h-elically coiled expanding springs inter; posed between the eyes and abutments on the outer ends o-f the rods.

2. In a device of the class described, the combination with a nailing top sheet, or a rigid abutment located on one side thereof, a movable clamping bar opposed-to the abutment, a pair of eccentrics journaled on vertical axes located adjacent the clamping bar,

handles swinging in asubstantially horiform which I at of eccentrics journaledon verti zontal plane connected to said eccentrics, and a pair o'l? short spacing bars pivoted to the rear of the clamping bar and adapted to be turned into or out of engagement with the eccentrics. i'

3. In a grain door table, the combination with a nailing top sheet, of a rigid abutment located on one side thereof, a movable clamping bar opposed to the abutment sliding on the nailing top sheet, a pair of cocentrics journaled on vertical axes located adjacent'the clamping bar, means to keep the adjacent side of the clamping bar in contact with the eccentrics, and handles swinging in a substantially horizontal plane connected to said eccentrics, said abutment and said clamping bar adapted to have a grain door clamped directly between them,

t. In a grain door table, the combination with a nailing top sheet, of a rigid abutment located on one side thereot, a movable clamping bar opposed to the abutment sliding on the nailing top sheet, a pair of eccentrics journaled on vertical axes located adjacent the clamping bar, handles swinging in a substantially horizontal plane connected to said eccentrics, said abutment and said clamping bar adapted to have a grain door clamped directly etween them, and guiding means to hold the outer side of said clamping bar at both ends yieldingly against'the eccentrics.

5. In a grain door table, the combination with a nailing top sheet, of a rigid abutment located on one side thereoha movable clamping bar opposed to the abutment sliding on the nailing top sheet, a pair of eccentrics journaled on vertical axes located adjacent the clamping bar, handles swinging in substantially horizontal plane connected to said eccentrics, said abutment and said clamping bar adapted to have a grain door clamped directly between them, guiding means to hold the outer side of said clampingbar yieldingly against the eccentrics, and a pair of transverse bars secured to the nailing top sheet and adapted to engage the ends of the clamping bar it the latter is displaced longitudinally. I

6. In a grain door table, the combination with a nailing top sheet, of a rigid abutment located on one sidethereoit, a movable clamping bar opposed tothe abutment sliding on the nailing top sheet, a pair of eccentrics journaled on vertical axes located adjacent the clan'iping bar, means to keep. the ad jacent side of the clamping bar in contact with the eccentrics, and handles swinging in a substantially horizontal plane but slanting slightly upward connected to said eccentrics, said abutment and said clamping bar adapt ed to have a graindoor clampedfdirectlv between them. V I I Inwitness whereof, I havehereunto set myhand this 16th day of April, 1927.

. LEONARD SMITH.

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