US4016640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating and installing the grip of a hand-held implement
Assignee: NBD Bank
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Filing: 1975-08-27
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Granted: 1977-04-12
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Expires: 1995-08-27
Abstract
Abstract A grip for the handle of a hand-held implement that, in as-produced form, is comprised of a thin walled tubular member open at one end and a boot integral with the tubular member that closes its other end. The grip's average internal girth along its longitudinal axis, as produced, is substantially less than the average external girth of the implement's handle portion to be covered by the grip along that handle portion's longitudinal axis. The grip, which may have a novel exterior gripping surface, is produced by dipping a male mandrel into an elastomeric latex and, thereafter, curing the latex skin formed on the mandrel prior to stripping of the grip from the mandrel. The grip is installed on an implement's handle by creating a pressure differential between the interior and exterior of the grip, thereby causing the grip to stretch radially outward from its longitudinal axis. This stretching step allows the implement's handle to be inserted through the grip's open end until the handle's free end bottoms out in the grip's boot. Subsequently, the pressure differential is released, thereby causing the grip to stretch into a tight friction fit with the handle. The grip's boot may thereafter be removed by slicing off, if desired.
Inventors
- 👤 Robert E. Briggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:30
CPC Classifications
B; B25; B25G; B25G1/00; B25G1/10; A; A63; A63B; A63B60/00; A63B60/06; A63B60/08; A63B60/10; B23; B23P; B23P11/00; B23P11/02; B23P11/022; B29; B29C; B29C63/00; B29C63/22; A63B2208/00; A63B2208/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/4987; Y10T29/53; Y10T29/53657
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
328 words
A method of providing a grip on the handle of a hand-held implement, said implement having a free end type handle, and said grip being comprised of a tubular member open at one end and a boot integral with said tubular member that closes its other end, said method comprising dipping, into an elastomeric latex, a male mandrel having said grip's approximately as-produced and before-installation size, geometry, and exterior surface characteristics to form said grip, said grip being provided with an average internal girth between about 5 and about 50% less than the average external girth of said handle for that portion of said handle on which said grip is to be mounted, an average wall thickness of between about 0.01 inches and about 0.10 inches, a percentage elongation at break between about 400 and about 1000%, a tensile strength at break between about 2000 psi and about 6000 psi, and a modulus at 200% elongation between about 100 psi and about 500 psi, stripping the latex skin from said mandrel after said skin has cured, said skin being turned inside out as same is stripped, thereby orienting the as-produced grip's exterior surface on the outside of said grip, exposing the exterior surface of said grip to a vacuum sufficient to expand said grip throughout its longitudinal axis, said expansion being sufficient to permit said implement's handle to be inserted therein without touching the interior surface of said grip while the exterior surface is exposed to said vacuum, orienting the free end of said implement's handle adjacent the open end of said grip, inserting said implement's handle into said grip free end first until said free end bottoms out adjacent said grip's boot, bottoming out of said free end adjacent said boot serving to properly position said handle relative to said grip, and thereafter releasing said vacuum from the exterior of said grip, same permitting said grip to contract into a friction fit relation with said implement's handle.
Claim 2
Independent Claim
328 words
A method of providing a grip on the handle of a hand-held implement, said implement having a free end type handle, and said grip being comprised of a tubular member open at one end and a boot integral with said tubular member that closes its other end, said method comprising dipping, into an elastomeric latex, a male mandrel having said grip's approximately as-produced and before-installation size, geometry, and exterior surface characteristics to form said grip, said grip being provided with an average internal girth between about 5 and about 50% less than the average external girth of said handle for that portion of said handle on which said grip is to be mounted, an average wall thickness of between about 0.01 inches and about 0.10 inches, a percentage elongation at break between about 400 and about 1000%, a tensile strength at break between about 2000 psi and about 6000 psi, and a modulus at 200% elongation between about 100 psi and about 500 psi, stripping the latex skin from said mandrel after said skin has cured, said skin being turned inside out as same is stripped, thereby orienting the as-produced grip's exterior surface on the outside of said grip, exposing the exterior surface of said grip to a vacuum sufficient to expand said grip throughout its longitudinal axis, said expansion being sufficient to permit said implement's handle to be inserted therein without touching the interior surface of said grip while the exterior surface is exposed to said vacuum, orienting the free end of said implement's handle adjacent the open end of said grip, inserting said implement's handle into said grip free end first until said free end bottoms out adjacent said grip's boot, bottoming out of said free end adjacent said boot serving to properly position said handle relative to said grip, and thereafter releasing said vacuum from the exterior of said grip, same permitting said grip to contract into a friction fit relation with said implement's handle.
Claim 3
Dependent Claim
29 words
An installation method as set forth in claim 1 including the step of supporting said grip from underneath said grip's boot when said grip is vertically oriented during installation.
Claim 4
Dependent Claim
23 words
An installation method as set forth in claim 1 wherein said vacuum is created by one of hand and foot operated vacuum pumps.
Claim 5
Dependent Claim
44 words
An installation method as set forth in claim 1 including cuffing the open end of said tubular member over a vacuum chamber's collar to aid in defining an airtight chamber within which said grip is positioned prior to exposing said grip to a vacuum.
Claim 6
Dependent Claim
24 words
An installation method as set forth in claim 1 wherein said vacuum created is between about 12 inches mercury and about 20 inches mercury.
Claim 7
Dependent Claim
26 words
An installation method as set forth in claim 1 wherein said hand-held implement is one of a baseball bat, a tennis racquet and a golf club.
Claim 8
Dependent Claim
17 words
An installation method as set forth in claim 1 wherein said elastomeric latex is a rubber latex.
Claim 9
Dependent Claim
38 words
An installation method as set forth in claim 1 including the steps of preheating said mandrel prior to dipping same in said elastomeric latex, and passing said mandrel through a curing oven after dipping same in said latex.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |