Lost motion tool retainer
OwnerHenri Emonetinventor
Life of this patent
Estimating the term…
Abstract
The invention permits the interchangeability of a variety of shifters on the same housing of a jack hammer. The one piece housing is provided with two appropriately placed lugs with coaxial holes which intersect with the central bore of the housing. By utilizing an appropriate sleeve, this housing can be used regardless of whether a spring pin type or a latch type shifter is used. With a spring pin shifter, the coaxial holes are used to lock the shifter in place and thereby contain the tool within the sleeve. With a latch type shifter, a groove in the sleeve is aligned with the coaxial holes permitting the insertion of a pin to hold the sleeve in the housing. Flanges on the sleeve provide the appropriate mounting means for the latch.
Claims9
A reciprocating piston operated jack hammer device for breaking concrete utilizing mutually exclusively a latch type and a spring-type shifter, said device comprising:
- a one piece housing having one end portion;
- an opposite end portion housing said piston;
- and a central bore therethrough;
- a sleeve member mounted in the central bore of said one end portion of the housing, said sleeve member having a shoulder abutting said one end portion of the housing, said sleeve member further having an axial passage;
- means for mounting said sleeve member to said housing;
- a tool member having a shank portion, a working end portion and a flange therebetween, said shank portion being slidably mounted in said axial passage of the sleeve member;
- means for interchangeably securing a latch type shifter with a spring type shifter to said housing, said securing means further including:
- at least one pitched contact surface on the external surface of said one end portion of the one piece housing:
- two spaced lugs located on the external surface of the housing, said lugs having coaxial holes for receiving a spring type shifter, said holes intersecting said central bore of the housing;
- means for removably securing a latch type shifter to said sleeve member;
- means limiting slidable movement of said tool member to a predetermined position in a direction away from said sleeve member;
- and
- means for mounting said limiting means to said housing so that when said piston strikes said tool member to slidably move said tool member in a direction away from said piston, said limiting means engages said flange of the tool member to prevent said tool member from sliding beyond a predetermined distance from said sleeve member and such that when said tool member slidably moves in a direction towards said piston, said flange of said tool member engages said sleeve member to terminate slidable movement towards said piston.
Dependencies are inferred from the claim text.