Spring devices – Resilient shock or vibration absorber
Patent
1979-08-28
1983-02-15
Burr, Edgar S.
Spring devices
Resilient shock or vibration absorber
400291, 400341, 400686, B41J 1908, B41J 2106
Patent
active
043737080
DESCRIPTION:
BRIEF SUMMARY
This invention pertains to a thrust absorption mechanism, which includes a thrust piece the function of which is to block a moving body in motion, and in which the thrust piece is subject to displacement under the effect of kinetic energy of said moving body against the action of a spring and a shock absorber.
This form of mechanism allows the reduction of stress due to shocks in the moving body when the latter works together with the thrust piece, thus it allows a reduction of the size of the components and also a reduction in cost.
In numerous applications, such as in typewriters, a thrust mechanism is used to establish the position of a moving body at full stop, it being locked after the stop stroke when its speed is nil or slight, as the spring is compressed. In such cases, use is generally made of an intermediate member between the moving body and the thrust piece, this intermediate member being released when the moving body is locked.
However, in such known mechanisms, the stop stroke depends on kinetic energy and as a result there is uncertainty as to the stop position of the moving body in relation to the thrust mechanism. This can be very troublesome in the case of certain applications and expecially in a situation where there is used a thrust mechanism of the kind to stop the slide which carries the letter support of a typewriter during a tabulation, for example.
The object of the invention is to achieve a shock absorption thrust mechanism for typewriters which guarantees a continuing stop stroke of a moving body to be stopped regardless of its initial speed.
The thrust mechanism according to the present invention is characterized by the fact that it includes a drive device for the thrust piece in a predetermined movement, said drive device acting jointly with the moving body on said thrust piece.
The attached drawing shows, schematically and by way of example, a preferred embodiment of the thrust absorption mechanism, which is the object of the invention.
FIG. 1 is a side view of the thrust absorption mechanism of the invention.
FIG. 2 is a view from above.
The thrust mechanism depicted in the drawing is attached to a stand 1 by a bracket 2 provided with a pin 3. A lever 4 and an arm 5 are hinged around the pin 3. The lever 4 comprises a punched and folded sheet so as to form, on the one hand, a double arm 6 carrying an axle 7 and, on the other hand, a lever arm 8 which has a hole 9 at its tip. A cam in the form of an eccentric roller 10 is mounted on axle 7 and has a circular shoulder 11 centered with respect to axle 7. The arm 5 is pressed against shoulder 11 by a draw spring 12 and can work together with a flat truncated surface 13 of the shoulder 11 so as to maintain the eccentric roller 10 in a rest position shown in FIG. 1.
A bell crank 14, rotating around an axle 15 attached to the stand 1, includes a thrust receiving abutment 16 engaged by a member 17 attached to a moving body, not shown on the drawing. The bell crank 14 includes a tip 18 which works together with a thrust piece 19 through its tip 18. The thrust piece 19 slides against the action of a spring 20 and a shock absorber 21. A tip 22 of a lever 22' connected to the bell crank 14 works together with one of the sides 23 of the double arm 6 to maintain the eccentric roller 10 away from a driving shaft 24 driven in continuing rotation by an electric motor, not shown.
A rod 25, engaged in the hole 9 of the lever arm 8, links the latter to the bell crank 14 so that a rotation of the lever arm 8 transmits a corresponding rotation to the bell crank 14.
Preferrably, the eccentric roller 10 is made of plastic and has a notched tread 26. The driving shaft 24 is surrounded by a rubber sleeve 27 in its portion which engages the tread 26 of the eccentric roller 10.
when the member 17, attached to the moving body to be stopped, comes toward the abutment 16 in the direction of arrow F, the bell crank 14 rotates and tilts downwardly with its tip 18 acting on the thrust piece 19 to depress it against the action of spring 20.
The side 23 of the
REFERENCES:
patent: 1050548 (1913-01-01), Kavle
patent: 1516685 (1924-11-01), Rinsche
patent: 1992940 (1935-03-01), Foothorap
patent: 2818959 (1958-01-01), Walton
patent: 2826287 (1958-03-01), Dodge
patent: 2862593 (1958-12-01), Buhler et al.
patent: 2879879 (1959-03-01), Dodge
patent: 3048255 (1962-08-01), Israelson
Burr Edgar S.
Groff, Jr. Emory L.
Hermes Precisa International S.A.
Pearson Charles
LandOfFree
Thrust absorption 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 Thrust absorption mechanism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thrust absorption mechanism will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1797364