US 4,709,841 A · Tool for installing expandable fastener

Abstract

A hand-held manually-operable tool is disclosed for installing a two-piece expandable plastic fastener (including an expandable body and an insertable pin) in a panel hole. The tool comprises a hand-held housing having a hollow barrel from which a spring-biased hollow plastic sleeve projects. A pushrod within the hollow sleeve is movable with the housing. The sleeve tip releasably engages and supports either the body or pin of a fastener manually mounted thereon and aligns the pin with the pushrod which subsequently forces the pin into the body to effect expansion. The sleeve tip end has either resiliently flexible legs to engage the body or resiliently flexible compressible foam rubber strips to engage the pin. In use, the tool directs the body into the panel hole and is pressed to cause the sleeve to retract so that the pushrod can force the pin into the body to effect body expansion. Thereafter, the tool is moved away from the panel to allow the sleeve to re-extend from the tool barrel and disengage from the fastener. Sleeves of different sizes are provided. A hollow adapter member for the sleeve and an extension member for the pushrod enable a sleeve to handle different sized fasteners. A trigger-operated latch member engages the sleeve to prevent premature sleeve retraction.

Claims13

Dependent claims

A tool for installing a two-piece expandable fastener comprising a fastener body having a head and an expandable shank insertable in a panel hole and further comprises a pin associated with said fastener body and depressible in a bore in said fastener body to effect shank expansion, said tool comprising:

a housing having a housing bore open at one end;
a pushrod mounted in said housing and extending through said housing bore to near said one end;
a sleeve having a tip end and having a sleeve bore therethrough for accommodating said pushrod and axially movable relative to said housing bore and to said pushrod between an extended position wherein said tip end extends outwardly from said end of said housing bore and a retracted position wherein said tip end is nearer said one end of said housing bore;
biasing means in said housing for biasing said sleeve toward said extended position;
and means on said tip end of said sleeve for releasably engaging a portion of said fastener to support said fastener and to align said pin with said pushrod to enable said body shank to be inserted in said panel hole as said tool is manipulated and to enable said pushrod to engage and depress said pin as said tool is moved toward said panel.

2 more elements

As an article of manufacture

for mounting on a fastener installation tool and adapted to support and align a two-piece fastener to be installed by said tool, said fastener comprising a fastener body having a head and a relatively movable fastener pin associated with said body and insertable in a body bore in said body;
said article of manufacture taking the form of a sleeve made of resilient flexible plastic and having inner and outer ends and an axial sleeve bore therethrough for accommodating a pushrod on said tool;
at least one slot extending axially inwardly from the outer end of said sleeve to enable resilient flexing of a portion of the sleeve wall adjacent said slot whereby the sleeve bore at the outer end of said sleeve defines a recess which can receive a portion of said fastener body in frictional engagement;
and shoulder means on said sleeve near said outer end thereof and within said bore for engaging said head of said fastener body to exert axial pressure thereon.

1 more element

Dependencies are inferred from the claim text.

Tool for installing expandable fastener

Life of this patent

Tool for installing expandable fastener

Life of this patent

Abstract

Claims13