US2440820A

US2440820A - Multiple screw c clamp

Info

Publication number: US2440820A
Application number: US527085A
Authority: US
Inventors: Herbert J Frank
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-03-18
Filing date: 1944-03-18
Publication date: 1948-05-04
Anticipated expiration: 1965-05-04

Description

y 1948- H. J. FRANK 2,440,820

MULTIPLE SCREW G CLAMP Filed March 18, 1944" firfierffrania Patented May 4, 1948 orrrce This invention relates to clamps and has relation more particularly to a device of this kind of a C typ and it is an object of the invention to provide a clamp of this kind constructed in a manner to make the same particularly advantageous for use in holding the work against a seesaw type base.

It is also an object of the invention to provide a clamp of this kind including a plurality of pressure screws .coacting with a clamping base of aseesaw or rocker type.

In the use of the ordinary type C clamp employing a single pressure screw, there is a tendency for the clamp to walk or creep when tightened and it often occurs that by the use of only a single clamping point, the clamp is of reduced efliciency. It is a further object of the invention to provide a clamp constructed in a manner to obviate these disadvantages and which is particularly effective when used to hold two pieces of metal together while doing any machining or hand work upon such metal pieces.

The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved clamp whereby certain important advantages are attained, as will be hereinafter more fully set forth.

In order that my invention may be better understood, I will now proceed to describe the same with reference to the accompanying drawings, wherein:

Figure 1 is a view in side elevation of a clamp constructed in accordance with an embodiment of my invention, with a portion broken away;

Figure 2 is a view in front elevation of the device as herein comprised; and

Figure 3 is a view in top plan.

In the embodiment of the invention as illustrated in the accompanying drawings, the improved clamp comprises a body I of a ctype and which is reinforced from substantially one end to the other by an outstanding strengthening rib 2. This rib 2 at one extremity of the body I is transversely thickened or enlarged to provide a head 3 through which threads the elongated clamping screws 4.

These screws 4 are in parallelism and are spaced apart in a direction lengthwise of the head 3. These screws 4 are also in relatively close proximity one to the other and the inner end portions of these screws 4 each has in swlveled connection therewith, as at 5, a foot 6 for clamping or holding contact with the work.

The feet 6 carried by the screws 4 coact with the base or jaw 1 of a seesaw or rocker type. This 2 base or jaw I is elongated and is provided along its side margins with the perpendicularly related flanges 8 which overlie the side faces of the end portion of the body I or an extended extremity 9 of the flange 2,

These flanges 8 are pivotally held to said. body or flange extension 9 by a pivot member In, herein disclosed as a conventional type of rivet. The pivotal mounting H] for the base or jaw I is at a point substantially midway of the ends of said base or jaw 1 or midway between the screws 4.

The outer end portions of the screws 4 are provided with the enlargements or heads ll having disposed therethrough the openings ['2 whereby a suitable cross-bar or other member may be readily employed to efiect the desired rotation of the screws 4.

My improved clamp is particularly adapted for,

use to hold two pieces of metal together while doing any machining or hand work upon such pieces although, of course, I do not wish to be understood as limiting myself to such specific use. It is believed to be obvious that with the use of my clamp, the coaction between the screws 4 and the base or jaw I is such as to assure an equal clamping pressure upon tightening of either of the screws 4, and it is furthermore believed to be readily apparent that with the use of my improved clamp, the tendency of the work with which it is engaged to, walk or creep is eliminated.

It is also of advantage to provide the outer or working face of the base or jaw l at the transverse center thereof with a groove 14 extending entirely along said base or jaw. This groove l4 makes it convenient to use the clamp to grip a piece of round rod or stock against a surface.

From the foregoing description it is thought to be obvious that a clamp constructed in accordance with my invention is particularly well lying in a common plane and being directed toward the opposite end portion, and a base with which the screws coact, mounted upon the said opposite end' portion of the body for rocking movement on an axis perpendicular to the surface of said common plane, the said axis lying in a plane passing centrally between the screws.

2. A clamp comprising a C-shaped body. spaced parallel screws threaded through one end portion of the body, the longitudinal axes of said screws lying in a common plane and being directed toward the opposite end portion, a base with which the screws coact, mounted upon the said opposite end portion of the body for rocking movement on an axis perpendicular to the surface of said common plane, the said axis lying in a plane passing centrally between the screws, said base having a fiat top surface having a length extending in the direction in which the screws are spaced, and a channel formed in and longitudinally of said top surface, its longitudinal axis lying in said common 4 nmnnncns orrnn The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 242,959 Naglee June 14, 1881 359,815 Sargent Mar. 22, 1887 431,641 Beach July 8, 1890 1,063,332 Diehl June 3, 1913 1,203,152 Steudner Oct. 31,1916

Vidinghofi Aug. 7, 1923