US2572738A

US2572738A - Hand crimper

Info

Publication number: US2572738A
Application number: US90510A
Authority: US
Inventors: Martin G Lovinggood
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-04-29
Filing date: 1949-04-29
Publication date: 1951-10-23
Anticipated expiration: 1968-10-23

Description

Oct. 23, 1951 M. G. LOVINGGOOD 2,572,738

HAND CRIMPER Filed April 29, 1949 Fig.

-m 36 40 42 L 0 @fll llll-llllmlllbiifil Patented Oct. 23, 1951 UNITED STATES PATENT OFFICE 1 2,572,738 I 7 iv I 4 HAND CREIPER- Martin G. Lovinggood, Odessa, Tex.

Application April 29, 1949, Serial No. 90,510

1 Claim.

This invention relates to a hand crimper especially designed for use in attaching a sheet metal take-off stub to a main duct for air conditioning and. similar purposes.

In air conditioning and. similar apparatus, it becomes necessary to insert a sheet metal takeoff stub in a hole provided in a main air duct. The stub must be crimped down firmly all around inside of the main duct to hold the take-off stub firmly in place and to make it airtight. At present, the take-off stub is crimped to the main duct by holding a small dolly against a shoulder on the outside of the main duct and reaching inside and hammering the take-01f stub down. The primary object of this invention is to provide a tool which will eliminate the time, trouble and efiort expended in the present installation method.

Another object of the invention is to provide a hand crimper for use in attaching a sheet metal take-off stub to a main duct comprising a first lever, means for receiving the wall of the stub in said lever, a fixed jaw carried by said lever adjacent said means, a second lever pivoted intermediate the ends of said first lever, a movable jaw, and linkage connected to said second lever for urging said movable jaw towards and away from said fixed jaw.

These, together with various ancillary objects and features of the invention which will later become apparent as the following description proceeds, are attained by the device, a preferred embodiment of which has been illustrated by way of example only in the accompanying drawings, wherein:

Figure 1 is a side elevational view of the device illustrating its use in crimping a take-off stub to a main duct;

Figure 2 is a side elevational view of the device shown in open position;

Figure 3 is a bottom plan view of the device; and

Figure 4 is a top plan view of the movable jaw.

Specific reference is now made to the drawings. In the several views in the accompanying drawings and in the following specification similar reference characters indicate corresponding elements throughout.

Indicated at I is a main air duct having an aperture I2 adapted to receive a sheet metal take-off stub M. The stub includes an annular shoulder [6 adapted to abut the duct II]. It becomes necessary to crimp the inner ends I8 against the inner surface of the duct H) to secure the stub to the duct, and the tool 20 has been provided for this purpose.

The tool includes a first lever 22 having a handle 24 and an elongated head 26. The head 26 includes an elongated slot 28 which is open at its forward end as at 30. As will be seen clearly in Fig. 1, the slot is adapted to receive the wall of the stub 14. Carried by the head adjacent the open end of the slot is a laterally extending fixed jaw 32 adapted to engage the shouder l6.

Pivoted to the first lever 22 as at 34 is a second lever 36 which, as shown in Fig. 3, straddles the head 26 of the first lever. The second lever also includes a handle 38. Pivoted as at 40 to the upper end of the lever 36 is a link 42, which at its free end is pivotally secured as at 44 to a pair of short arms 46 that are in turn pivoted as at 48 to the head 26. The arms 46 carry a laterally extending movable jaw 50.

In use, the crimper 20 is slipped into the stub l4 so that the wall thereof is received in the slot 28, the fixed jaw 32 abutting the shoulder I 6. The

handles

24 and 38 are spread apart, as shown in Figure 2, to move the jaw 5|! away from the jaw 32. In this position the jaw 50 engages the inner end l8 of the stub. When the handles are urged together, the jaw 50 moves towards the jaw 32, as shown in Fig. l, crimping the end [8 against the inner surface of the main duct l0.

In view of the foregoing description taken in conjunction with the accompanying drawings it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention the same is susceptible to certain changes fully comprehended by the spirit of the invention as herein described and the scope of the appended claim.

Having described the invention, what is claimed as new is:

A hand crimper for use in attaching a sheet metal take-off stub to a main duct comprising a first lever having an elongated head and a slot extending longitudinally through substantially the entire length of said head and opening through the free end thereof, said slot being adapted to receive the annular wall of a take-off stub, a fixed jaw at the free end of said head and extending laterally thereof, a second lever pivoted intermediate its ends to said first lever, a first link pivoted intermediate its ends to the free end of said head, a second jaw at one end of said first 3 link and opposite said fixed jaw, and a second link Number terminally pivoted to said second lever and to the 805,651 other end of said first link. 902,570 MARTIN G. LOVINGGOOD. 1,151,772 5 1,219,726 REFERENCES CITED 1 54 The following references are of record in the 2,126,225 file of this patent:

.UNITED STATES PATENTS 10 Number Number: Name Date? 201,361

630,387 Maxwell Aug. 8, 1899 Name Date Lang Nov. 28, 1905 Ellis Nov. 3, 1908 Erickson Aug. 31, 1915 Gray Mar. 20, 1917 Carlson June 9, 1925 Simons Aug. 9, 1938 FOREIGN PATENTS Country; Date Great Britaint. 1 Aug: 2, 1923