Cam adjustment for tension spring of sewing machine head lifter

Details Cam adjustment for tension spring of sewing machine head lifter Cam adjustment for tension spring of sewing machine head lifter

1976-03-25

1977-04-19

Gilliam, Paul R.

Supports: cabinet structure

Disappearing-instrument type

On swingable link or linkage

312 21, 312 26, 248280, A47B 8100

Patent

active

040184870

ABSTRACT:
An improved sewing machine head lifter mechanism for supporting a sewing machine head in a cabinet includes a support linkage with a spring support mechanism for the linkage. An adjustable cam member is provided for cooperation with the spring mechanism. Thus, the adjustable cam engages one end of a tension spring. The opposite end of the spring engages a head support bracket. The spring is supported intermediate its ends. Pivotal movement of the cam member adjusts tension of the spring to provide the requisite force for supporting the head support bracket and an attached sewing machine head.

REFERENCES:
patent: 484401 (1892-10-01), Bolton
patent: 834104 (1906-10-01), Borden
patent: 1178488 (1916-04-01), Bolens
patent: 1500425 (1924-07-01), Thurman et al.
patent: 2739778 (1956-03-01), Krone et al.
patent: 2822229 (1958-02-01), Carlson
patent: 2977170 (1961-03-01), Hochman
patent: 3295809 (1967-01-01), Smola et al.
patent: 3948472 (1976-04-01), Metcalf

Affiliated with

Also associated with

Rating

Cam adjustment for tension spring of sewing machine head lifter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cam adjustment for tension spring of sewing machine head lifter , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cam adjustment for tension spring of sewing machine head lifter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-99769