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US5615807: Convertible dripless caulking gun for variant viscosity media

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Filing Information

Inventor(s) Yuenan Peng ·
Assignee(s) None listed in document.
Attorney/Agent(s) Thomas I. Rozsa ·
Primary Examiner Joseph Kaufman ·
Application Number US8439706
Filing date 05/12/1995
Issue date 04/01/1997
Predicted expiration date 10/12/2014
U.S. Classifications 222/391  · 222/153.01  ·
International Classifications G01F 1100  ·
Kind CodeA
International Classifications 222153.01;325;326;327;386;391 ·
Related U.S. Application DataRELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 08/322,945, filed on Oct. 12, 1994, which is incorporated herein by this reference now abandoned.
6 Claims, No Drawings


Abstract

A caulking gun having a fixed first bearing surface, and an engagement member for preventing rearward movement of a plunger shaft while permitting forward movement thereof. Following termination of forward movement of the plunger shaft in response to operation of a handle mechanism of the gun, the plunger shaft selectively can be moved rearwardly a predetermined distance in response to cartridge back pressure. In an alternative mode of operation, the rearward movement is substantially prevented for effecting precise control and smoothly continuous feeding of media from the gun. In one configuration, a shifting link permits movement of the plunger shaft together with the engagement member up to a distance E when a control surface is positioned for providing forward movement of the engagement member in response to forward movement of the plunger shaft. In another configuration wherein the handle mechanism has ratcheting engagement with the plunger shaft, a counterpart of the engagement member is pivotable relative to opposite ends of a fixed pivot slot in response to positioning of the control surface.

Independent Claims | See all claims (6)

  1. 1. A caulking gun comprising:(a) a frame for receiving a supply of caulking material;(b) a plunger shaft axially movable in the frame for forwardly urging the caulking material from the gun;(c) a handle mechanism movably supported on the frame and operatively connected for engaging and forwardly advancing the plunger shaft in response to reciprocal operation of the handle mechanism, the handle mechanism having a released position for permitting at least some rearward movement of the plunger shaft, the handle mechanism further including first and second ratchet members sequentially engaging an array of discontinuities on the plunger shaft, the first ratchet member being coupled to a handle member for reciprocal operation thereby, the second ratchet member being pivotably supported about a first position relative to the frame for permitting rearward movement of the plunger shaft up to a distance less than a spacing between adjacent discontinuities being engaged by the second ratchet member when the handle mechanism is returned to the released position, and about a second position for permitting rearward movement of the plunger shaft up to a distance greater than the spacing between the adjacent discontinuities when the handle mechanism is returned to the released position;(d) an engagement member movably supported relative to the frame and having a first orientation for gripping the plunger shaft and preventing rearward movement of the shaft relative to the engagement member while permitting forward movement of the plunger shaft relative to the engagement member, and a second orientation for permitting free axial movement of the plunger shaft relative to the engagement member;(e) means for biasing the engagement member toward the first orientation in contact with the plunger shaft;(f) a first bearing surface fixably located relative to the frame for preventing rearward movement of the engagement member in the first orientation thereof relative to a first position thereof;(g) a control surface movably located relative to the frame for selectively providing forward movement of the engagement member in the first orientation thereof relative to the first position thereof in response to forward movement of the plunger shaft; and(h) means for permitting rearward movement of the plunger shaft in response to a predetermined force that is produced by pressure within the supply of caulking material upon return of the handle mechanism to the released position when the control surface is permitting rearward movement of the plunger shaft.

References Cited

U.S. Patent Documents

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Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
GB1011470EXPANDITE LTDDec 1995

Patent Family

Document NumberAssigneeInventorsIssue/Pub Date
CA2160197 PENG YUENAN PENG YUENAN Apr 1996
US5615807 Yuenan Peng Apr 1997