Implements or apparatus for applying pushing or pulling force – Hoisting truck – Single throw lever
Reexamination Certificate
2006-10-31
2008-08-19
Wilson, Lee (Department: 3723)
Implements or apparatus for applying pushing or pulling force
Hoisting truck
Single throw lever
C254S00200C
Reexamination Certificate
active
07413166
ABSTRACT:
An extendible jack stand comprises first, second, and third vertical frames arranged in telescoping relationship. A locking mechanism includes an upwardly extending finger fixedly secured to an outer surface of the upper end of the first frame. A guide member is secured to the upper end of the second frame and extends horizontally outward. A latch member is slideable within the guide member and has a slotted opening therein for receiving the finger, with springs urging the latching member inward. When the third frame is fully extended, the latch member is urged into a groove in the third frame and permits the second frame to be extended. The upper end of the finger has an outward surface that inclined at about 32° for sliding the latch member outward along the guide member. The inward surface then inclines at an angle of about 45°. The inward surface further extends inclined at an angle of about 23. The guide member, the finger and the latch member are formed of 4130-4140 steel and are heat treated to a hardened of about 40-45 Rockwell C.
REFERENCES:
patent: 4289298 (1981-09-01), Kameda
patent: 4589630 (1986-05-01), Arzouman
patent: 4641813 (1987-02-01), Arzouman
patent: 4697788 (1987-10-01), Arzouman
patent: 4960264 (1990-10-01), Arzouman et al.
patent: 5110089 (1992-05-01), Slay
patent: 5183235 (1993-02-01), Arzouman et al.
patent: 2003/0218156 (2003-11-01), Arzouman
patent: 2003/0218157 (2003-11-01), Arzouman
patent: 2003/0218158 (2003-11-01), Arzouman
patent: 2003/0218159 (2003-11-01), Arzouman
Turner Roger C.
Wilson Lee
LandOfFree
Commercial lifting device-jack stand frame locking mechanism does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Commercial lifting device-jack stand frame locking mechanism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Commercial lifting device-jack stand frame locking mechanism will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4003087