AU695877B2 - A plastic molded trowel handle having fingerguard and palm grip - Google Patents
A plastic molded trowel handle having fingerguard and palm grip Download PDFInfo
- Publication number
- AU695877B2 AU695877B2 AU10039/97A AU1003997A AU695877B2 AU 695877 B2 AU695877 B2 AU 695877B2 AU 10039/97 A AU10039/97 A AU 10039/97A AU 1003997 A AU1003997 A AU 1003997A AU 695877 B2 AU695877 B2 AU 695877B2
- Authority
- AU
- Australia
- Prior art keywords
- trowel
- handle
- inner core
- user
- finger guard
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 239000004033 plastic Substances 0.000 title claims description 20
- 229920003023 plastic Polymers 0.000 title claims description 20
- 210000003811 finger Anatomy 0.000 claims description 38
- 239000000463 material Substances 0.000 claims description 16
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 11
- 210000005224 forefinger Anatomy 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 210000003813 thumb Anatomy 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- -1 polypropylene Polymers 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 2
- 239000011449 brick Substances 0.000 description 7
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229920006217 cellulose acetate butyrate Polymers 0.000 description 1
- 230000002925 chemical effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000002085 irritant Substances 0.000 description 1
- 231100000021 irritant Toxicity 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229920003031 santoprene Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F21/00—Implements for finishing work on buildings
- E04F21/02—Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
- E04F21/06—Implements for applying plaster, insulating material, or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25G—HANDLES FOR HAND IMPLEMENTS
- B25G1/00—Handle constructions
- B25G1/10—Handle constructions characterised by material or shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25G—HANDLES FOR HAND IMPLEMENTS
- B25G3/00—Attaching handles to the implements
- B25G3/02—Socket, tang, or like fixings
- B25G3/08—Socket, tang, or like fixings with dovetail or other groove
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25G—HANDLES FOR HAND IMPLEMENTS
- B25G3/00—Attaching handles to the implements
- B25G3/02—Socket, tang, or like fixings
- B25G3/12—Locking and securing devices
- B25G3/32—Locking and securing devices in association with, or including, tang, bolt, or other member passing axially through whole length of handle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25G—HANDLES FOR HAND IMPLEMENTS
- B25G3/00—Attaching handles to the implements
- B25G3/34—Attaching handles to the implements by pressing the handle on the implements; using cement or molten metal, e.g. casting, moulding, by welding or the like
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F21/00—Implements for finishing work on buildings
- E04F21/02—Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
- E04F21/16—Implements for after-treatment of plaster or the like before it has hardened or dried, e.g. smoothing-tools, profile trowels
- E04F21/161—Trowels
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
S F Ref: 265841D1
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECIFCATION FOR A STANDARD PATENT
ORIGINAL
ir r *fl.
Name and Address of Applicant: Actual Inventor(s): Address for Service: Invention Title: Marshalltown Trowel Company 104 South 8th Avenue Marshalltown Iowa 50158 UNITED STATES OF AMERICA Curtis Dwight Kelsay Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia A Plastic Molded Trowel Handle Having Fingerguard and Palm Grip 4* The following statement is a full description of this invention, including the best method of performing it known to me/us:- 5845 BACKGROUND OF THE INVENTION The present invention relates to a trowel handle and more particularly to a brick trowel handle which is injection molded from two separate types of plastic. A finger guard is integrally molded from a smooth surface thermoplastic resin which serves to protect the user's forefinger and thumb during troweling. An outer palm grip is molded from a thermoplastic rubber having a slightly soft, non-slip, rubber-like feel, surface which serves to provide favorable grippability to the handle and comfort to the user.
Present brick trowels include a flat trowel gee. blade made of metal and have a metal post formed integrally with the blade. The post extends upward from the blade and extends horizontally to become a tang for connecting the handle. The handle is typically made of wood, but in recent years some are formed of plastic. The handle is typically 20 cylindrical in shape.
When plastics such as cellulose acetate butyrate are used for the handle, the low coefficient of friction of the smooth outer surface of the handle allows slippage of the trowel in the user's hand, particularly where the hand becomes wetted from perspiration or mortar. A firm grip upon the handle of a trowel is advantageous to prevent the trowel from turning when troweling the I I -s mortar or when its edge is being used for splitting or chipping bricks.
In addition, when trowels are used to spread mortar, or in breaking and trimming bricks, the user tends to position his thumb and forefinger against the metal trowel shank to provide better control in manipulating the trowel. The user's hand is thus prone to become chapped and worn and may develop callouses on the finger and thumb. This is particularly true where the metal shank includes one or more angled surfaces. A major factor promoting callousing of the hand is the presence of mortar.
Mortar serves as an irritant by its abrasiveness as well as its chemical effect on the skin.
o*o Object of the Invention It is the object of the present invention to overcome or substantially ameliorate the above disadvantages.
Summary of the Invention There is firstly disclosed herein a trowel comprising: a flat blade; a shank extending upwardly from the top surface of said blade; a tang extending from said shank; and a handle secured to said tang and being disposed above the top surface of said blade, said handle including: an outer grip member formed of a first thermoplastic rubber material and providing a grip surface of a first coefficient of friction with the user's hand; (ii) an inner core formed of a second more rigid plastic material, said inner core providing a front portion having an outer surface contiguous with said outer 15 grip member at the interface of said intergrip member and said front portion providing S a smooth surface transition across said interface; (iii) a protective finger guard formed in said front portion and spaced forward of said interface and providing an outer surface having a second coefficient of, friction with the user's hand, said finger guard extending downward with respect to said 20 grip surface of said outer grip member and covering the rear portion of said shank for preventing contact between the user's fore finger and said shank when the user grips the handle.
There is further disclosed herein a trowel having a shank, a handle tang, and a handle secured to said tang, said handle including: an outer grip member formed of a first thermoplastic rubber material and providing a grip surface of a first coefficient of fricti'n with the user's hand; (ii) an inner core formed of a second plastic material; (iii) a protective finger guard formed of said second plastic material providing an outer surface having a second coefficient of friction with the user's hand, said finger guard formed integral with said inner core, said finger guard extending downward with respect to said grips surface of said outer grip irmcnber for protecting the user's fore finger when the user grips the handle.
IN .L.BlH1002O2)90ex, Brief Description of the Drawings A preferred form of the present invention will now be described by way of example with reference to the accompanying drawings wherein: Figure 1 is a perspective view of a trowel embodiment of the present invention; Figure 2 is a bottom view of the trowel handle of the trowel of Figure 1; Figure 3 is a side view of the trowel handle of the trowel of Figure 1; Figure 4 is a cross-sectional end view of the handle of Figure 3 taken along line 4-4 in Figure 3; Figure 5 is a partial cross-sectional side view of the distal end of the trowel handle of Figure 3; Figure 6 is an end view of the trowel handle of Figure 2.
4o e e IN lrIPHHI00290:o0x
II
6 DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to Fig. 1, a trowel 11 is constructed from a flat metal blade 13, a metal shank 15 and a handle 17. Shank 15 is integrally formed with, or is otherwise secured to, the top surface of blade 13 in a conventional manner. Shank 15 extends upwardly from the top surface of the blade providing a metal handle tang 19 which serves as the support structure of handle 17. Tang 19 extends distally from shank 15 and is raised above the plane of blade 13 in a generally parallel disposition thereto. Blade 13, e• shank 15 and tang l are typically forged of metal as one piece.
Referring to Figs. 2, 3, and 4, handle 17 includes an inner core 21 and an outer grip 23. A finger guard 25 is disposed at the proximal end of the handle and a bumper 27 is located rearward at i the distal end. Inner core 21 is molded integral with finger guard 25 and may be molded or formed 20 directly onto tang 19. The molding may be accomplished by an injection molding procedure and serves to secure core 21 directly onto metal tang 19. As a result, core 21 and finger guard 25 are formed as a single unitary piece and are held fixed to the trowel tang. Tang 19 extends into the inner core approximately three inches.
The inner core 21, fingerguard 25, and outer grip 23 may be formed initially as a unit and then pressed onto tang 19. The unit is formed with a bore for receiving the tang. The assembly may be facilitated in a number of ways including heating of the bore prior to forcing the unit over the tang.
Inner core 21 and finger guard 25 may be formed from polypropylene. The polypropylene forms a hard, durable finger guard 25 and provides a smooth outer surface 26 to the finger guard 25. The smooth outer surface 26 provides a low coefficient of friction with the users hand permitting the user's forefinger and thumb to freely slide along the surface during .e manipulation of the trowel without a chaffing drag.
As shown in Figs. 2 and 3, finger guard terminates at a distal end 51 having a circular configuration. From end 51, the inner core 21 extends distally beginning from a proximal end 53 having a circular configuiation concentric with and of a diameter smaller than the distal end 51 of finger guard 25. The difference in diameters 20 between ends 51, 53 provides an offset for housing outer grip 23 such that the outer surface 26 of finger guard 25 is contiguous to and flush with the outer surface 24 of grip 23. This provides continuity of surface between the outer surface of grip 23 and the outer surface of finger guard After the first mold shot of polypropylene has formed inner core 21 and finger guard 25, outer grip 23 is injection molded around the formed inner core 21. Outer grip 23 is generally cylindrical in shape and of a uniform thickness, extending over the majority of the surface area of the handle. Inner core 21 increases in diameter as it extends from its proximal end 53 to the central area of the handle, and thereafter decreases in diameter as it extends to its distal end 28. Distal end 28 need not be covered by outer grip 23, as shown in Fig. Outer grip 23 may be formed from a thermoplastic rubber, for example, Santoprene
M
a product of Monsanto Corporation. The surface of outer grip 23 may have a smooth or light texture and be felt as slightly soft or pliable like rubber.
The outer grip provides a non-slip gripping surface 24 for the user's hand. The gripping surface 24 provides a second and higher coefficient of friction with the user's hand as compared to the coeffecient of friction of finger guard 25. Normally the palm of the user's hand together with the user's last three fingers grip the thermoplastic rubber surface.
Rear bumper 27 is a separate piece that is fastened tightly against the distal end 28 cf the inner core 21. Rear bumper 27 may be made frzm a hard, rigid plastic, for example, urethane. The plastic of the bumper is to be able to withstand tapping against brick as is the typical use cf the end of a trowel handle by a brick layer.
-II II Rear bumper 27 may be securely fastened to the trowel by many conventional means. As shown in Figs. 5 and 6, bumper 27 includes an aperture passing through it. Aperture 30 is formed of an enlarged cylindrical opening 29 and a smaller concentric cylindrical opening 31. The aperture provides a passage for receiving a screw 37.
An annular stop surface 33 is formed at the base of opening 29 at the interface of, the meeting of, openings 29 and 31. Stop surface 33 engages the head 35 of screw 37 (and a flat circular washer not shown-- which may be used) when the s. crew is secured into inner core 23. A bore 39 is formed in the inner core 21 (and outer grip 23 should the outer grip be molded over the distal end 28 of the inner core). Bore 39 receives the screw e* shank 41 for drawing bumper 27 tightly against end 28. Rear bumper 27 protects the thermoplastic rubber outer grip from being destroyed by the 20 continual tapping of the end of the handle against bricks.
Referring to Figs. 2 and 3, finger guard 25 is formed to include a depending member 43 which carries a forefinger engaging surface 45, Member 43 partially wraps around the rearward, or distal, surface of shank 15 co cover the shank 15 as shown in Figs. 2 and 3. Surface 45 provides a wide Ushaped curved surface upon which the user's forefinger may rest during troweling. Finger guard protects the user's finger from direct contact with the shank 15 preventing resulting irritation caused thereby. The outer surface 26 of the finger guard 25 may be smooth in the area of curved surface Finger guard 25 also includes a generally cylindrical section 47 which is slightly tapered from distal end 51 toward the forward, or proximal, end of the handle 17. Cylindrical section 47 presents a cylindrical outer surface which is smooth and upon which the user may rest his thumb for troweling manipulations.
While only a single, preferred embodiment of the invention has been described hereinabove, those of ordinary skill in the art will recognize that the embodiment may be modified and altered without departing from the central spirit and scope of the invention. Thus, the preferred errbodiment described 20 hereinabove is to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended ts be embraced herein.
Claims (24)
1. A trowel, comprising: a flat blade; a shank extending upwardly from the top surface of said blade; a tang extending from said shank; and a handle secured to said tang and being disposed above the top surface of said blade, said handle including: an outer grip member formed of a first thermoplastic rubber material and providing a grip surface of a first coefficient of friction with the user's hand; an inner core formed of a second more rigid plastic material, said inner core providing a front portion having an outer surface contiguous with said outer grip member at the interface of said outergrip member and said front portion providing a smooth surface transition across said interface; (iii) a protective finger guard formed in said front portion and spaced forward of said interface and providing an outer surface having a second coefficient of friction, lower than said first coefficient of friction, with the user's hand, said finger guard extending downward with respect to said grip surface of said outer grip member and covering the rear portion of said shank for preventing contact between the user's fore finger and said shank when the user grips the handle.
2. The trowv) of claim 1 wherein said finger guard is shaped to provide said outer surface at a predetermined location on said handle for contact with the thumb of the user's hand.
3. The trowel of claim 1 wherein said inner core is formed about said tang. 25
4, The trowel of claim 1 wherein said inner core is injection molded about said tang.
The trowel of claim 4 wherein said outer grip member is injection molded about said inner core.
6. The trowel of claim 1 wherein said inner core is offset from said finger guard, S S. S.
7. The trowel of claim 6 wherein said grip surface of said grip member is flush with said outer surface of said finger guard.
8. The trowel of claim 1 and further including a rear bumper secured to the distal end of said handle, said bumper protecting said outer grip member from impact upon the distal end of said handle.
9, The trowel of claim 8 wherein said rear bumper is formed from a plastics material. The trowel of claim 1 wherein said outer grip member is formed from Sa thermoplastic rubber material.
IN I 4- C- li~- -Y r I 12
11. The trowel of claim 10 wherein said inner core is formed from polypropylene.
12. The trowel of claim 9 wherein said bumper is formed from a plastics material.
13. A trowel having a shank, a handle tang, and a handle secured to said tang, said handle including: an outer grip member formed of a first thermoplastic rubber material and providing a grip surface of a first coefficient of friction with the user's hand; (ii) an inner core formed of a second plastic material; (iii) a protective finger guard formed of said second plastic material providing an outer surface having a second coefficient of friction, lower than said first coefficient of friction, with the user's hand, said finger guard formed integral with said inner core, said finger guard extending downward with respect to said grip surface of said outer grip member for protecting the user's fore finger when the user grips the handle.
14. The trowel of claim 13 wherein said finger guard is shaped to provide said outer surface at a predetermined location on said handle for colitact with the thumb the user's hand.
15. The trowel of claim 13 wherein said inner core is injection molded about said tang. 2o
16. The trowel of claim 15 wherein said outer grip member is injection molded about said inner core.
17. The trowel of claim 13 wherein said inner core is offset from said finger guard.
18. The trowel of claim 17 wherein said grip surface of said grip member 25 is flush with said outer surface of said finger guard.
19. The trowel of claim 13 and further including a rear bumper secured to the distal end of said handle, said bumper protecting said outer grip member from impact at the distal end of said handle.
The trowel of claim 19 wherein said rear bumper is formed from a plastics material.
21. The trowel of claim 13 wherein said outer grip member is formed from a thermoplastic rubber material.
22. The trowel of claim 21 wherein said inner core is formed from polypropylene.
23. The trowel of claim 20 wherein said bumper is formed from a plastics material.
24. The trowel of claim 13 wherein said inner core is formed about said tang. IN 01DIHIOW901m, 13 A trowel, substantially as described I in with reference to the accompanying drawings. DATED this Seventh Day of July 1998 Marshalltown Trowel Company Patent Attorneys for the Applicant/Nominated Person SP-SON FERGUSON fee.. 0. 00 INALIBHHWO02DO:[am A PLASTIC MOLDED TROWEL HANDLE HAVING FINGERGUARD AND PALM GRIP Abstract A trowel handle (17) is injection molded from two separate types of plastic. An inner core (21) is molded together with a finger guard from a plastic providing a smooth surface of a first coefficient of friction with the user's hand. The finger guard (25) covers the metal tang (19) of the trowel and protects the user's forefinger and thumb during troweling. An outergrip (23) is molded from a thermoplastic rubber providing a soft, rubber-like surface of a second coefficient of friction with the user's hand. Figure 3. o e 4*b**o KMH/2139U IIIILI
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU78426/98A AU720190B2 (en) | 1993-03-02 | 1998-07-24 | A plastic molded trowel handle having fingerguard and palm grip |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/025,622 US5327612A (en) | 1993-03-02 | 1993-03-02 | Plastic molded trowel handle having fingerguard and palm grip |
| US025622 | 1993-03-02 | ||
| AU57516/94A AU5751694A (en) | 1993-03-02 | 1994-03-02 | A plastic molded trowel handle having fingerguard and palm grip |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU57516/94A Division AU5751694A (en) | 1993-03-02 | 1994-03-02 | A plastic molded trowel handle having fingerguard and palm grip |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU78426/98A Division AU720190B2 (en) | 1993-03-02 | 1998-07-24 | A plastic molded trowel handle having fingerguard and palm grip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU1003997A AU1003997A (en) | 1997-02-27 |
| AU695877B2 true AU695877B2 (en) | 1998-08-27 |
Family
ID=25631655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU10039/97A Ceased AU695877B2 (en) | 1993-03-02 | 1997-01-06 | A plastic molded trowel handle having fingerguard and palm grip |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU695877B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4381579A (en) * | 1979-12-21 | 1983-05-03 | Hilti Aktiengesellschaft | Handle for a hand-held device |
| US4739536A (en) * | 1985-07-13 | 1988-04-26 | Wera Werk Hermann Werner Gmbh & Co. | Screwdriver handgrip having harder and softer zones |
-
1997
- 1997-01-06 AU AU10039/97A patent/AU695877B2/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4381579A (en) * | 1979-12-21 | 1983-05-03 | Hilti Aktiengesellschaft | Handle for a hand-held device |
| US4739536A (en) * | 1985-07-13 | 1988-04-26 | Wera Werk Hermann Werner Gmbh & Co. | Screwdriver handgrip having harder and softer zones |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1003997A (en) | 1997-02-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ON | Decision of a delegate or deputy of the commissioner of patents (result of patent office hearing) |
Free format text: OPPOSITION UNDER SECTION 59 OF THE PATENTS ACT 1990. THE OPPONENT S ARGUMENT WAS NOT PERSUASIVE. COSTS WERE AWARDED AGAINST NEILL TOOLS LIMITED. Opponent name: NEILL TOOLS LIMITED Effective date: 20001009 |
|
| CC1 | Opposition refused - proceed to grant |
Opponent name: NEILL TOOLS LIMITED |
|
| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |