US1740238A

US1740238A - Work-holding clamp

Info

Publication number: US1740238A
Application number: US322866A
Authority: US
Inventors: Carl L Gustafson
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-11-30
Filing date: 1928-11-30
Publication date: 1929-12-17
Anticipated expiration: 1946-12-17

Description

Dec. 17, 1929. c. 1.. GUSTAFSON ,7 3

. WORK HOLDING CLAMP Filed Nov. so. 1928 (4P1 4. az/rgrsa/v wag/V7 477' P/V'J Patented Dec. 17, 1929 STTES ETE PAT OFFEQF;

CARL I. GUSTAFSON, OF CHICAGO, TLLIEOTS WORK-HOLDING CLAMP This invention relates to improvements in a carpenters clamp or the like and has for one of its principal objects the provision of means for quickly and conveniently adjusting the jaws of the clamp for any desired span.

in the usual clamp or vise the only means for moving the jaws of the same when a diflerent span is desired is by the use of the clamp screw. Obviously this is a slow tedious process when a great variation in span is desired.

One of the important objects of this invention is to provide means in conjunction with is a device of the class mentioned, for disengaging the clamp screw from the threads contained in the fixed jaw, thereby permitting the screw to be slid through the fixed jaw,

and in turn drawing the movable jaw toward 2% or away from the fixed jaw. When the aproximate span is obtained the screw can be readily positioned operatively with respect to the fixed threads and the device may then be used in the ordinary manner.

Other and further important objects of the invention will be apparent from the disclosures in the accompanying drawings and following specification.

w The invention, in a preferred form, is illustrated in the drawings and hereinafter more fully described.

In the drawings: Figure 1 is a side elevation of the clamp. Figure 2 is a detail sectional view, illuscrating in particular the screw engaging and disengaging mechanism.

Figure 3 is a detail plan'sectional view showing the screw operatively associated with the segmental thread.

'40- Figure 4 is a detail sectional View of the screw end housing.

Figure 5 is a sectional view taken on the line 55 of Figure 1.

As shown .in the drawings:

The reference numeral 10 indicates generally a screw of the usual square thread type ordinarily used for translation purposes. One end of the screw is provided with a rigidly attached handle member 12. The

' other end of the screw is positioned loosely in an opening 14 in a movable clamp jaw 16. As shown best in detail section in Figure 4, the end of the member 10 has mounted thereon a cap 18, the mounting comprising a rivet 20 or the like positioned transversely through the screw 10 and cap 18. A housing 22 is mounted upon the member 16 and completely encloses the end of the screw 10 and the cap 18, an oil hole 24 being provided in the same for lubricating purposes.

The movable jaw 16 is adapted to slide upon a leg 26 which in turn is rigidily connected to a fixed jaw 29. To facilitate the sliding of the member 16 upon the leg 26 and decrease wear at the sliding surfaces, the two operative edges of the leg 26 are provided with metal facings 28 attached to the leg by means of countersunk screws or the like 30. A guide 32 also provided with a metal face 3% is rigidly attached to the jaw 7 16 and operates at the rear edge of the leg 26' thus preventing the jaw 16 from assuming other than a right-angle position on the leg 26.

The screw 10 is also positioned through an opening 36 in the fixed aw 28. The opening 36 is tapered inwardly and adapted to be inserted therein is a member 38 which flanged at one end for readily mounting the same on the edge of the jaw 28. One portion of the inner surface of the member 38 con prises a semi-cylindrical threaded element 40. It is apparent that by means of the taper construction of the member 38 the screw 10 can be engaged and disengaged by moving the same into and out of operation with the thread segment 40. Mounted loosely upon the screw 10 is a sleeve or collar 42 having integrally attached to one end thereof a notched hand-wheel 44E. Rigidly attached to one face of the said hand-wheel and extending outwardly therefrom is a pin 46. As shown best in Figure 2, the sleeve 42 when placed in operative position in the opening 36 places the screw 10 in engagement with 9 the threaded segment 40, thus adapting the clamp to slow motion clamping action. Ob Viously when the sleeve is removed from the opening the screw is freed from the threads and the screw may be slidably moved as desired, thus permitting a rapid change of span of the

jaws

16 and 28.

It is apparent that herein is provided a device which is convenient, extremely useful and rugged and a saving of both time and labor can be eliiected by its use.

I am aware that many changes may be made and numerous details of construction varied throughout a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon otherwise than as necessitated by the prior art.

I claim as my invention:

1. In a carpenters clamp, a pair of jaws movable relative to each other, a screw operatively associated with each jaw and means for rendering the screw inoperative as such with respect to one of the jaws, means including a semi-cylindrical internally threaded member, one of the jaws being provided with a tapered opening into which the said member is adapted to be housed, the screw being adapted to be inserted in the said opening and means for removably positioning the screw relative to the threaded semicylindrical member.

2. In a carpenters clamp, a pair of jaws movable relative to each other, a screw op eratively associated with eacri jaw and means for rendering the screw inoperative as such with respect to one of the jaws, said means including a semi-cylindrical internally threaded member, one of the aws being provided with a tapered opening into which the said member is adapted to be housed, the screw being adapted to be inserted in the said opening and means for removably positioning the screw relative to the threaded semi-cylind "ical member, said means comprising a collar slidably mounted on the screw, and adapted to be inserted in the opening in the said jaw and means on the collar for holding the screw in operative position with respect to the segmental threads.

3. in a carpenters clamp, a pair of jaws movable relative to each other, a screw operatively associated with each jaw and means for rendering the screw inoperative as such with respect to one of the jaws, said means including a semi-cylindrical internally threaded member, one of the jaws being provided with a tapered opening into which the said member is adapted to be housed, the screw being adapted to be inserted in the said opening and means for removably positioning the screw relative to the threaded semi-cylindrical member, said means comprising a collar slidably mounted on the screw, and adapted to be inserted in the opening in the said jaw and means on the collar for holding the screw in operative position with respect to the segmental threads, said means including an annular member rigidly mounted on the collar, a pin rigidly mounted on the annular member, the said pin being adapted to cooperate with the tapered side of the opening.

4. A carpenters clamp, including in combination, a pair of jaws, one fixed and one slidable, a screw passing through openings provided in each jaw, the screw being loosely positioned in the opening in the movable jaw and optionally threadedly or slidably positioned in the opening in the fixed jaw, and means upon the movable for res rioting slidable motion in one direction of the screw relative thereto, and means upon the screw for preventing slidable motion in the other direction, of the screw relative to the jaw, said first means comprising a housing completely enclosing the end of the screw and mounted rigidly upon the jaw, the second means including a cap rigidly connected to the end of the screw adjacent the said jaw.

In testimony whereof I aifix my signature.

CARL GUSTAFSON.