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US5615807: Convertible dripless caulking gun for variant viscosity media
Yuenan Peng ·
None listed in document.
Thomas I. Rozsa ·
Joseph Kaufman ·
|Application Number|| US8439706|
|Filing date|| 05/12/1995|
|Issue date|| 04/01/1997|
|Predicted expiration date|| 10/12/2014|
|U.S. Classifications ||
|International Classifications ||
G01F 1100 ·
|International Classifications ||
|Related U.S. Application Data||RELATED 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
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.
- 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.
U.S. Patent Documents
Foreign Patent Documents
|Document Number||Assignees||Inventors||Issue/Pub Date|
|GB1011470||EXPANDITE LTD||Dec 1995|