Process for manufacturing a bow rake

• US 5,643,520 A
• Filed: 01/18/1995
• Issued: 07/01/1997
• Est. Priority Date: 01/18/1995
• Status: Expired due to Fees

• Current Assignee: Joseph Allen Carmien
• Original Assignee: Joseph Allen Carmien
• Inventors: Carmien, Joseph Allen
• Primary Examiner(s): ORTIZ, ANGELA Y
• Application Number:
  US08/374,927
• Time in Patent Office: 895 Days
• Field of Search: 264/249, 264/250, 264/239, 264/241, 264/255, 264/274, 264/275, 264/266, 264/313, 264/221, 264/DIG. 44, 264/319, 264/265, 264/294, 29/458, 29/525
• US Class Current: 264/249
• CPC Class Codes: B29C 65/44 Joining a heated non plastics element to a plastics element
• CPC Class Codes: B29C 66/721 Fibre-reinforced materials B29C66/729 takes precedence
• CPC Class Codes: B29C 66/7392 characterised by the material of at least one of the parts being a thermoplastic
• CPC Class Codes: B29C 66/8242 Pneumatic or hydraulic drives using fluid pressure directly acting on the parts to be joined B29C66/8266
• CPC Class Codes: B29C 66/8322 Joining or pressing tools reciprocating along one axis
• CPC Class Codes: Y10S 264/44 using destructible molds or cores in molding processes
• CPC Class Codes: Y10T 29/49885 with coating before or during assembling
• CPC Class Codes: Y10T 29/49945 by driven force fit

Abstract

In a process for manufacturing a bow rake, an outer plastic encasement is molded over a structural skeleton to form a cross-head including a handle-receiving socket and a plurality of spaced-apart tines. An elongated claw is pressed into an end of each tine, and an end of a handle is securing within the handle-receiving socket. In manufacturing the cross-head, one or more voids in the structural skeleton are filled with a selected flowable filler material which provides a structural backstop to maintain the shape integrity of the hollow skeleton during the molding step. Some or all of the filler material is removed from the skeleton subsequent to the molding step. Prior to pressing the claws into the tines, the claws are heated and then secured on a ram. The cross head is placed in a stationary jig in alignment with the ram, and the heated claw is then pressed into the selected tine. A similar process is utilized to connect the handle to the cross-head.

Claims

1. A process for manufacturing a bow rake, comprising the steps of:

molding an outer encasement over a structural skeleton to form a cross-head for the bow rake including a handle-receiving socket and a plurality of spaced-apart tines;

heating a claw;

aligning an end of a selected tine including a thermoplastic section with an end of the heated claw;

driving the heated claw into the thermoplastic section of the selected tine such that as the heated claw engages the tine the thermoplastic section is softened to permit entry of the claw whereby the thermoplastic material of the thermoplastic section flows into intimate contact around the claw and then hardens as the heat of the claw is dissipated to hold the claw in place; and

securing an end of a handle within the handle receiving socket.

2. The process of claim 1, wherein the molding step comprises the steps of filling one or more voids within the structural skeleton with a selected flowable filler material, molding an outer encasement about the exterior of the structural skeleton, whereby the filler material provides a structural backstop to maintain the shape integrity of the structural skeleton during the outer encasement molding step, and removing some or all of the filler material from the structural skeleton subsequent to the outer encasement molding step.

3. The process of claim 2, wherein the filling step comprises filling the one or more voids of the structural skeleton with small rigid pellets, and wherein the structural skeleton comprises an elongated tubular member having a fiber-resin jacket and one or more reinforcing cores disposed within the fiber-resin jacket.

4. The process of claim 1, including the step of providing an elongate claw receiving channel in the thermoplastic section of the tine such that the cross-sectional dimensions of the claw receiving channel are less than the cross-sectional dimensions of the claw, and wherein during the aligning step the heated claw is positioned adjacent to and in alignment with the claw receiving channel, and wherein the interference between the cross-sectional dimensions of the claw and the cross-sectional dimensions of the claw receiving channel is within the range of 0.015 inch to 0.025 inch.

5. The process of claim 1, wherein the claw is provided surface irregularities and is heated in a heating block within the range of 300°

F. to 500°

F. prior to alignment with the selected tine, and wherein the aligning step includes the steps of placing the claw in a ram, and placing the cross-head in a stationary jig so as to align the selected tine with the claw.

6. The process of claim 1, wherein the securing step comprises the steps of providing a connecting stud having one end secured within the cross head and another end extending into the handle-receiving socket, heating the connecting stud, and driving the end of the handle into the handle-receiving socket such that the connecting stud is driven into a thermoplastic section of the handle such that as the heated connecting stud engages the tool handle, the thermoplastic section is softened to permit entry of the connecting stud whereby the thermoplastic material of the thermoplastic section flows into intimate contact around the connecting stud and then hardens as the heat of the connecting stud is dissipated to hold the handle in place.

7. A process for manufacturing a bow rake, comprising the steps of:

molding a cross-head to include a handle-receiving socket and a plurality of spaced-apart tines, the molding step including the steps of filling one or more voids within a structural skeleton with a selected flowable filler material, and molding an outer encasement about the exterior of the structural skeleton, whereby the filler material provides a structural backstop to maintain the shape integrity of the structural skeleton during the outer encasement molding step;

attaching a claw at an end of each tine; and

securing an end of a handle within the handle receiving socket.

8. The process of claim 7, wherein the attaching step includes the steps of heating the claw, aligning an end of a selected tine including a thermoplastic section with an end of the claw, and driving the heated claw into the thermoplastic section of the selected tine such that as the heated claw engages the tine the thermoplastic section is softened to permit entry of the claw whereby the thermoplastic material of the thermoplastic section flows into intimate contact around the claw and then hardens as the heat of the claw is dissipated to hold the claw in place.

9. The process of claim 7, wherein the securing step comprises the steps of providing a connecting stud having one end secured within the cross head and another end extending into the handle-receiving socket, heating the connecting stud, and driving the end of the handle into the handle-receiving socket such that as the heated connecting stud engages the tool handle the thermoplastic section is softened to permit entry of the connecting stud whereby the thermoplastic material of the thermoplastic section flows into intimate contact around the connecting stud and then hardens as the heat of the connecting stud is dissipated to hold the handle in place.

10. The process of claim 7, including the step of removing some or all of the filler material from the structural skeleton subsequent to the outer encasement molding step.

11. The process of claim 10, wherein the filling step comprises filling the one or more voids of the structural skeleton with small rigid pellets, and wherein the structural skeleton comprises an elongated tubular member having a fiber-resin jacket and one or more reinforcing cores disposed within the fiber-resin jacket.