US1700334A - Clamp - Google Patents

Description

Jan. 29, 1929.

' J. W. PUTERBAUGH CLAMP Filed May 17. 1927 h IAQVENTCRY.

ATTORNEY:

Patented Jan. 29, 1929.

PATENT OFFICE.

JACK W. PUTERB AUGH, F CINCINNATI, OHIO.

CLAMP.

Application filed May 17,

My inventionrelates more particularly to what is known as screw clamps, comprlsing an elongated C frame with the corresponding clamp member mounted in lower end of the C frame, and having a screw-threaded engagement therewith to be adjusted into clamping position by rotation of the screw.

As ordinarily constructed, it takes considerable time to bring the screw-threaded member into clamping position, andthe same loss of time is experienced in opening up the clamp for subsequent adjustment. Then, due to the length of the screw, theordinary construction is apt to be far from rigid.

It is'to avoid this delay in adjustment and to give strength and rigidity to the device that my invention is directed, and it consists of that certain novel construction and arrangement of parts to be hereinafter par- 2 ticularly pointed out and claimed.

In the drawings Figure 1 is aside elevation of my improved Cclamp. a Figure 2 is an enlargedlongitudinal secv 2 tion on theline 2, 2, of Figure 1.

Figure 3 is a similar cross section on the lines 3-3 of Figure 1.

The clamp comprises the usual C frame 1 provided with aflattened clamp member 2. The other clampmember embodies ahead 3 which has swivelled engagement with the bar "or rod 4 which is mounted in anelongated sleeve 5. The lower end of the rod 4 has screw-threaded engagement with the sleeve as shown at 6. The sleeve is mounted to slide vertically in theelongated boss 7 at the lower end of the C frame, and is provided with a longitudinal rib 8 formed with teeth 01' notches 9 which are engaged by, apawl 10 pivoted onpin 12 in a lug on the frame. The pawl is pressed into engagement with the notches 9 by spring pin 13. The inclination of the teeth or notches permits of raising theclamp member 3 to engagement with the work by pushing up on thehandle 14 attached to the screw-threaded end ofthe bar 4.

The pawl will engage the proper notch,

1927. Serial No. 192,091.

and a turn of thehandle 14 will firmly clamp the work. To release the clamp, the screw is slightly reversed and the entire member is released by the operative press on the outer end of the holding pawllO which swings out of engagement with the notches.

Thus, in a moments time, the clamp can be released and readjusted, and a single turn of thehandle 14 is all that is necessary for tightening and readjustment. The pawl rests with itsheel 15 on the frame, so that there is no strain on thepivot pin 12. The particular advantage of so arranging-the pivoted pawl that its heel is in actual contact with the'base of the slot in the lug in which it is pivoted, is that the stress exerted when the clamp.is tightened is directed directly against the metal to metal contact, thus provided, so that all shearing strain on the pivot pin is avoided. As this type of clamp is often used for very heavy work more satisfactory work can be obtained and the danger to workmen of the clamp suddenly releasing the Work is avoided.

The mounting of the sleeve in the elongated the engagement of the rib in the slot in the boss prevents the sleeve from rotating as the screw on the rod is turned by the handle.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is c A clamp comprisingin combination a C- shaped frame, a sliding sleeve having ratchet teeth thereon and having a. clamping rod boss gives rigidity to the construction,'and v

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